"
COPYRIGHT (c) 1989 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
Scanner subclass:#Parser
instanceVariableNames:'classToCompileFor selfValue contextToEvaluateIn selector
methodArgs methodArgNames methodVars methodVarNames tree
currentBlock parseForCode usedInstVars usedClassVars usedVars
modifiedInstVars modifiedClassVars modifiedGlobals usesSuper
usedGlobals usedSymbols usedMessages localVarDefPosition
evalExitBlock selfNode superNode hasPrimitiveCode
hasNonOptionalPrimitiveCode primitiveNr primitiveResource logged
warnedUndefVars warnSTXHereExtensionUsed correctedSource
foldConstants lineNumberInfo currentNamespace
currentUsedNamespaces warnUndeclared'
classVariableNames:'PrevClass PrevInstVarNames PrevClassVarNames
PrevClassInstVarNames LazyCompilation ArraysAreImmutable
ImplicitSelfSends WarnST80Directives FoldConstants LineNumberInfo
SuppressDoItCompilation EmptySourceNotificationSignal'
poolDictionaries:''
category:'System-Compiler'
!
!Parser class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 1989 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
documentation
"
Parser is used for both parsing and evaluating smalltalk expressions;
it first builds a parseTree which is then interpreted (evaluate) or
compiled. Compilation is done in the subclass ByteCodeCompiler and/or
the (planned) MachineCodeCompiler.
methods of main interest are:
Parser evaluateExpression:...
and:
Parser parseExpression:...
Parser parseMethod:...
there is protocol to parse complete methods, selector specs, body only etc.
Parser is also used to find the referenced/modified inst/classvars of
a method - this is done by sending parseXXX message to a parser and asking
the parser for referencedXVars or modifiedXVars (see SystemBrowser).
You can also use parsers for all kinds of other things (ChangesBrowser for
example analyzes the expressions in the changelist ...) by looking at the
parsers tree. (Although this is somewhat dangerous, since it exports the
compilers internals ... better style is to add specialized query methods here,
which will be done incrementally.)
One instance of Parser is created to parse one method or expression - i.e.
its not suggested to reuse parsers.
Constant folding:
The parser has various modes for constant folding; by default, only numeric
expressions involving integers and floats are constant folded
(i.e. something like 'Float pi sin' or '1.5 + 0.3' will be reduced to a constant).
Constant folding can be turned off completely (setting FoldConstants to nil)
to ``secure folding'', which only folds constant numbers (#level1) or to #full.
In full mode, more constant expressions are folded (for example: '1.0 @ 1.0' is
reduced to a constant point), but the resulting code may not be compatible with other
smalltalk systems (consider the case, where the point is modified using #x: or #y: messages).
Therefore, this mode is a bit dangerous and disabled by default.
Immutable arrays:
Immutable arrays are experimental and being evaluated.
Consider the case of a method returning '#(1 2 3 4)', and that array being modified
by some other method (using #at:put:). Since the array-return is actually a return of
a reference to the compiler created array, the next invokation of the method will
return the modified array. These are hard to find bugs.
By an option, the compiler can generate immutable arrays, which dont allow modification
of its elements. For clean code, you should enable this option during development.
As mentioned above, this is experimental. If it is reported to be a useful feature,
the immutable feature will be extended to strings, point-literals etc. in a future version
of st/x.
[Instance variables:]
classToCompileFor <Class> the class (or nil) we are compiling for
selfValue <any> value to use as self when interpreting
contextToEvaluateIn <Context> the context (or nil) when interpreting
selector <Symbol> the selector of the parsed method
(valid after parseMethodSpecification)
methodArgs internal
methodArgNames <Collection> the names of the arguments
(valid after parseMethodSpecification)
methodVars internal
methodVarNames <Collection> the names of the method locals
(valid after parseMethodBodyVarSpec)
tree <ParseTree> the parse tree - valid after parsing
currentBlock if currently parsing for a block
usedInstVars set of all accessed instances variables
(valid after parsing)
usedClassVars same for classVars
usedVars all used variables (inst, class & globals)
modifiedInstVars set of all modified instance variables
modifiedClassVars same for clasVars
localVarDefPosition <Integer> the character offset of the local variable
def. (i.e. the first '|' if any)
Not yet used - prepared for automatic add of
undefined variables
evalExitBlock internal for interpretation
selfNode <Node> cached one-and-only 'self' node
superNode <Node> cached one-and-only 'super' node
hasPrimitiveCode <Boolean> true, if it contains ST/X style primitive code
hasNonOptionalPrimitiveCode
<Boolean> true, if it contains ST/X style primitive code
which is NOT flagged by the OPTIONAL directive.
primitiveNr <Integer> the parsed ST-80 type primitive number (or nil)
logged
warnedUndefVars <Set> set of all variables which the parser has
already output a warning (to avoid multiple
warnings about the same variable)
[Class variables:]
PrevClass <Class> class, of which properties are
cached in:
PrevInstVarNames <Collection> instance variablenames of cached class
PrevClassVarNames <Collection> class variablenames of cached class
PrevClassInstVarNames <Collection> class instance variablenames of cached class
LazyCompilation <Boolean> EXPERIMENTAL: lazy compilation
ArraysAreImmutable <Boolean> if true, create array literals
as instances of ImmutableArray,
which cannot be stored into.
Default is false, for compatibility.
Can be turned on while developping
new code to make certain that side
effects are avoided.
WarnST80Directives <Boolean> if true, give warnings about
ST-80 directives (resource defs)
which are ignored in st/x.
defaults to false.
FoldConstants <Symbol> controls how constant folding should be
done.
Can be one of:
nil - no constant folding
#level1 - numeric optimizations only
#level2 - secure optimizations only
#full - full folding
level1: arithmetic on constant numbers
level2: above PLUS array conversions with #asFloatArray,
#asDoubleArray, string concatenation
full: constant points.
[see also:]
ByteCodeCompiler Scanner ObjectFileLoader
Workspace
SystemBrowser
[author:]
Claus Gittinger
"
! !
!Parser class methodsFor:'instance creation'!
for:aStringOrStream in:aClass
"return a new parser, reading code for aClass from aStringOrStream"
|parser|
parser := self for:aStringOrStream.
parser setClassToCompileFor:aClass.
^ parser
! !
!Parser class methodsFor:'ST-80 compatibility'!
parse:aString class:aClass
"same as #parseMethod:in: for ST80 compatibility."
|parser|
parser := self parseMethod:aString in:aClass.
parser notNil ifTrue:[^ parser tree].
^ nil
"Modified: 19.6.1997 / 16:34:57 / cg"
! !
!Parser class methodsFor:'Signal constants'!
emptySourceNotificationSignal
^ EmptySourceNotificationSignal
"Created: 14.10.1997 / 17:03:31 / cg"
! !
!Parser class methodsFor:'changes'!
flushNameCache
"unconditional flush name caches"
PrevClass notNil ifTrue:[
PrevClass removeDependent:Parser
].
PrevClass := nil.
PrevInstVarNames := nil.
PrevClassVarNames := nil.
PrevClassInstVarNames := nil.
"Parser flushNameCache"
!
update:something with:someArgument from:changedObject
"aClass has changed its definition - flush name caches if we have to"
(changedObject == PrevClass) ifTrue:[
something == #definition ifTrue:[
self flushNameCache
]
]
! !
!Parser class methodsFor:'controlling compilation'!
arraysAreImmutable
"return true if arrays are immutable literals"
^ ArraysAreImmutable
!
arraysAreImmutable:aBoolean
"turn on/off immutable array literals - default is false for ST-80 compatibilty."
ArraysAreImmutable := aBoolean.
"
can be added to your private.rc file:
Compiler arraysAreImmutable:true
Compiler arraysAreImmutable:false
"
!
compileLazy
"return true if compiling lazy"
^ LazyCompilation.
!
compileLazy:aBoolean
"turn on/off lazy compilation - return previous setting.
Actually this flag belongs into the ByteCodeCompiler subclass,
but it also controls the reporting of some errors here; therefore
its located here"
|oldLazy|
oldLazy := LazyCompilation.
LazyCompilation := aBoolean.
^ oldLazy
"
usually set in your .rc file
Compiler compileLazy:false
Compiler compileLazy:true
"
!
foldConstants
"return a symbol describing how constants are to be folded"
^ FoldConstants
"Created: 9.2.1996 / 17:40:13 / cg"
!
foldConstants:aSymbol
"set the symbol describing how constants are to be folded.
It can be:
nil - no constant folding
#level1 - numeric constants only
#level2 - level1 PLUS array conversions PLUS string concatenation
#full - level2 PLUS constant points, constant rectangles (dangerous)"
FoldConstants := aSymbol
"Created: 9.2.1996 / 17:40:34 / cg"
!
implicitSelfSends
"return true if undefined variables with
lowercase first character are to be turned
into implicit self sends"
^ ImplicitSelfSends
!
implicitSelfSends:aBoolean
"turn on/off implicit self sends"
ImplicitSelfSends := aBoolean
"
Compiler implicitSelfSends:true
Compiler implicitSelfSends:false
"
!
lineNumberInfo
^ LineNumberInfo
!
lineNumberInfo:aBoolean
LineNumberInfo := aBoolean
! !
!Parser class methodsFor:'defaults'!
maxLineNumber
"return the maximum lineNumber that is possibly
encoded in a methods byteCode debugging information.
Since lineNumber entries only have 1 byte available,
this is 255 for byteCode methods."
^ 255
"Created: 14.2.1997 / 16:52:54 / cg"
! !
!Parser class methodsFor:'evaluating expressions'!
evaluate:aStringOrStream
"return the result of evaluating an expression in aStringOrStream.
No doit-entry is added to the changeLog."
^ self
evaluate:aStringOrStream
in:nil
receiver:nil
notifying:nil
logged:false
ifFail:nil
compile:true
"
Compiler evaluate:'1 + 2'
Compiler evaluate:'''hello world'' asSortedCollection displayString printNL'
Compiler evaluate:'''hello world'' asSortedCollection printNL'
"
!
evaluate:aStringOrStream compile:compile
"return the result of evaluating aString,
The compile argument specifies if the string should be compiled down to
bytecode or instead be interpreted from the parseTree.
The first should be done for doIts etc, where a readable walkback is
required.
The latter is better done for constants, styleSheet and resource
reading and simple sends, where the overhead of compilation is bigger
than the interpretation overhead."
^ self
evaluate:aStringOrStream
in:nil
receiver:nil
notifying:nil
logged:false
ifFail:nil
compile:compile
!
evaluate:aStringOrStream ifFail:failBlock
"return the result of evaluating an expression in aStringOrStream.
In case of any syntax errors, return the value of failBlock.
No doit-entry is added to the changeLog."
^ self
evaluate:aStringOrStream
in:nil
receiver:nil
notifying:nil
logged:false
ifFail:failBlock
compile:true
"
Compiler evaluate:'1 +' ifFail:['oops']
"
!
evaluate:aStringOrStream in:aContext receiver:anObject notifying:requestor ifFail:failBlock
"return the result of evaluating aStringOrStream, errors are reported to requestor.
Allow access to anObject as self and to its instVars (used in the inspector).
No doIt entry is added to the change-file.
If the failBlock argument is non-nil, it is evaluated if an error occurs."
^ self
evaluate:aStringOrStream
in:aContext
receiver:anObject
notifying:requestor
logged:false
ifFail:nil
compile:true
"Modified: / 17.1.1998 / 02:54:07 / cg"
!
evaluate:aStringOrStream in:aContext receiver:anObject notifying:requestor logged:logged ifFail:failBlock
"return the result of evaluating aStringOrStream, errors are reported to requestor.
Allow access to anObject as self and to its instVars (used in the inspector).
If logged is true, an entry is added to the change-file. If the failBlock argument
is non-nil, it is evaluated if an error occurs."
^ self
evaluate:aStringOrStream
in:aContext
receiver:anObject
notifying:requestor
logged:logged
ifFail:failBlock
compile:true
!
evaluate:aStringOrStream in:aContext receiver:anObject notifying:requestor logged:logged ifFail:failBlock compile:compile
"return the result of evaluating aStringOrStream, errors are reported to requestor.
Allow access to anObject as self and to its instVars (used in the inspector).
If logged is true, an entry is added to the change-file. If the failBlock argument
is non-nil, it is evaluated if an error occurs.
Finally, compile specifies if the string should be compiled down to
bytecode or instead be interpreted from the parseTree.
The first should be done for doIts etc, where a readable walkback is
required.
The latter is better done for constants, styleSheet and resource
reading and simple sends, where the overhead of compilation is bigger
than the interpretation overhead."
|parser tree mustBackup loggedString chgStream value s sReal spc|
aStringOrStream isNil ifTrue:[
EmptySourceNotificationSignal raise.
^ nil
].
(mustBackup := aStringOrStream isStream) ifTrue:[
s := aStringOrStream.
] ifFalse:[
loggedString := aStringOrStream.
s := ReadStream on:aStringOrStream.
].
parser := self for:s.
parser parseForCode.
parser foldConstants:nil.
parser setSelf:anObject.
parser setContext:aContext.
aContext notNil ifTrue:[
parser setSelf:(aContext receiver)
].
parser notifying:requestor.
parser nextToken.
tree := parser parseMethodBodyOrEmpty.
"if reading from a stream, backup for next expression"
mustBackup ifTrue:[
parser backupPosition
].
(parser errorFlag or:[tree == #Error]) ifTrue:[
failBlock notNil ifTrue:[
^ failBlock value
].
^ #Error
].
tree isNil ifTrue:[
EmptySourceNotificationSignal raise.
^ nil
].
(logged
and:[loggedString notNil
and:[Smalltalk logDoits]]) ifTrue:[
Class updateChangeFileQuerySignal raise ifTrue:[
chgStream := Class changesStream.
chgStream notNil ifTrue:[
chgStream nextChunkPut:loggedString.
chgStream cr.
chgStream close
]
].
].
"
during the evaluation, handle nameSpace queries
from the value as defined by any namespace directive.
This, if its a class definition expression, the class will
be installed there.
"
spc := parser getNameSpace.
spc isNil ifTrue:[
(requestor respondsTo:#currentNameSpace) ifTrue:[
spc := requestor currentNameSpace
] ifFalse:[
spc := Class nameSpaceQuerySignal raise.
]
].
Class nameSpaceQuerySignal answer:spc
do:[
|method|
"
if compile is false, or the parse tree is that of a constant,
or a variable, quickly return its value.
This is used for example, when reading simple objects
via #readFrom:.
The overhead of compiling a method is avoided in this case.
"
((SuppressDoItCompilation == true)
or:[compile not
or:[tree isConstant
or:[tree isVariable
or:[aStringOrStream isStream
or:[aContext notNil]]]]]) ifTrue:[
^ tree evaluate
].
"
if I am the ByteCodeCompiler,
generate a dummy method, execute it and return the value.
otherwise, just evaluate the tree; slower, but not too bad ...
This allows systems to be delivered without the ByteCodeCompiler,
and still evaluate expressions
(needed to read resource files or to process .rc files).
"
self == Parser ifTrue:[
parser evalExitBlock:[:value | parser release. ^ value].
value := tree evaluate.
parser evalExitBlock:nil.
] ifFalse:[
aStringOrStream isStream ifTrue:[
s := parser collectedSource. "/ does not work yet ...
] ifFalse:[
s := aStringOrStream
].
"/ actually, its a block, to allow
"/ easy return ...
sReal := 'doIt ^[\' withCRs , s , '\] value' withCRs.
method := self
compile:sReal
forClass:anObject class
inCategory:'_temporary_'
notifying:requestor
install:false
skipIfSame:false
silent:true
foldConstants:false.
method notNil ifTrue:[
method ~~ #Error ifTrue:[
"
fake: patch the source string, to what the user expects
in the browser
"
method source:' \' withCRs , s .
"
dont do any just-in-time compilation on it.
"
method checked:true.
value := method
valueWithReceiver:anObject
arguments:nil "/ (Array with:m)
selector:#doIt "/ #doIt:
search:nil
sender:nil.
] ifFalse:[
parser evalExitBlock:[:value | parser release. ^ value].
value := tree evaluate.
parser evalExitBlock:nil.
]
].
]
].
parser release.
^ value
"Created: / 8.2.1997 / 19:34:44 / cg"
"Modified: / 17.1.1998 / 04:07:10 / cg"
!
evaluate:aStringOrStream logged:logged
"return the result of evaluating an expression in aStringOrStream.
The argument log controls if an entry is added to the changeLog."
^ self
evaluate:aStringOrStream
in:nil
receiver:nil
notifying:nil
logged:logged
ifFail:nil
compile:true
"
Compiler evaluate:'''some string''' logged:false
Compiler evaluate:'''some string''' logged:true
"
!
evaluate:aStringOrStream notifying:requestor
"return the result of evaluating aString,
errors are reported to requestor"
^ self
evaluate:aStringOrStream
in:nil
receiver:nil
notifying:requestor
logged:false
ifFail:nil
compile:true
!
evaluate:aStringOrStream notifying:requestor compile:compile
"return the result of evaluating aString,
errors are reported to requestor.
The compile argument specifies if the string should be compiled down to
bytecode or instead be interpreted from the parseTree.
The first should be done for doIts etc, where a readable walkback is
required.
The latter is better done for constants, styleSheet and resource
reading and simple sends, where the overhead of compilation is bigger
than the interpretation overhead."
^ self
evaluate:aStringOrStream
in:nil
receiver:nil
notifying:requestor
logged:false
ifFail:nil
compile:compile
!
evaluate:aStringOrStream receiver:anObject
"return the result of evaluating aString,
errors are reported to requestor. Allow access to
anObject as self and to its instVars "
^ self
evaluate:aStringOrStream
in:nil
receiver:anObject
notifying:nil
logged:false
ifFail:nil
compile:true
"
Compiler evaluate:'self x' receiver:(1 @ 2)
"
"Created: 1.7.1997 / 19:02:24 / cg"
"Modified: 1.7.1997 / 19:02:33 / cg"
!
evaluate:aStringOrStream receiver:anObject notifying:requestor
"return the result of evaluating aString,
errors are reported to requestor. Allow access to
anObject as self and to its instVars (used in the inspector)"
^ self
evaluate:aStringOrStream
in:nil
receiver:anObject
notifying:requestor
logged:false
ifFail:nil
compile:true
"
Compiler evaluate:'self x' receiver:(1 @ 2) notifying:nil
"
!
evaluate:aStringOrStream receiver:anObject notifying:requestor compile:compile
"return the result of evaluating aString,
errors are reported to requestor. Allow access to
anObject as self and to its instVars (used in the inspector).
The compile argument specifies if the string should be compiled down to
bytecode or instead be interpreted from the parseTree.
The first should be done for doIts etc, where a readable walkback is
required.
The latter is better done for constants, styleSheet and resource
reading and simple sends, where the overhead of compilation is bigger
than the interpretation overhead."
^ self
evaluate:aStringOrStream
in:nil
receiver:anObject
notifying:requestor
logged:false
ifFail:nil
compile:compile
! !
!Parser class methodsFor:'general helpers'!
argAndVarNamesForContext:aContext
"helper: given a context, return a collection of arg&var names"
|homeContext method numArgs numVars m src
blockNode argNames varNames vars sel isDoIt|
numArgs := aContext numArgs.
numVars := aContext numVars.
(numArgs == 0 and:[numVars == 0]) ifTrue:[^ #()].
homeContext := aContext methodHome.
sel := homeContext selector.
method := homeContext method.
"/ #doIt needs special handling below
isDoIt := (sel == #doIt) or:[sel == #doIt:].
aContext isBlockContext ifFalse:[
isDoIt ifTrue:[
method notNil ifTrue:[
"/ special for #doIt
m := nil.
src := ('[' , method source , '\]') withCRs.
blockNode := Compiler
blockAtLine:(aContext lineNumber)
in:m
orSource:src
numArgs:numArgs
numVars:numVars.
blockNode notNil ifTrue:[
argNames := #().
varNames := #().
numArgs > 0 ifTrue:[
vars := blockNode arguments.
vars size > 0 ifTrue:[
argNames := vars collect:[:var | var name]
]
].
numVars > 0 ifTrue:[
vars := blockNode variables.
vars size > 0 ifTrue:[
varNames := vars collect:[:var | var name].
]
].
^ argNames , varNames
].
]
].
method notNil ifTrue:[
^ method methodArgAndVarNames.
].
^ #()
].
method notNil ifTrue:[
isDoIt ifTrue:[
"/ special for #doIt
"/ my source is found in the method.
m := nil.
src := ('[' , method source , '\]') withCRs.
] ifFalse:[
m := method.
src := nil.
].
blockNode := Compiler
blockAtLine:(aContext lineNumber)
in:m
orSource:src
numArgs:numArgs
numVars:numVars.
blockNode notNil ifTrue:[
argNames := #().
varNames := #().
numArgs > 0 ifTrue:[
vars := blockNode arguments.
vars size > 0 ifTrue:[
argNames := vars collect:[:var | var name]
]
].
numVars > 0 ifTrue:[
vars := blockNode variables.
vars size > 0 ifTrue:[
varNames := vars collect:[:var | var name].
]
].
^ argNames , varNames
].
].
^ #()
"Created: / 17.1.1998 / 03:18:05 / cg"
"Modified: / 17.1.1998 / 03:55:44 / cg"
! !
!Parser class methodsFor:'initialization '!
initialize
LazyCompilation := false. "/ usually set to true in your .rc file
ArraysAreImmutable := false. "/ usually left true for ST-80 compatibility
ImplicitSelfSends := false.
WarnST80Directives := false.
FoldConstants := #level1.
LineNumberInfo := false.
EmptySourceNotificationSignal isNil ifTrue:[
EmptySourceNotificationSignal := QuerySignal new mayProceed:true.
EmptySourceNotificationSignal notifierString:'empty source given to evaluate'.
EmptySourceNotificationSignal nameClass:self message:#emptySourceNotificationSignal.
]
"
self initialize
"
"Modified: 14.10.1997 / 17:01:09 / cg"
! !
!Parser class methodsFor:'parsing'!
blockAtLine:line in:aMethod orSource:aString numArgs:nA numVars:nV
"given a lineNr in some method,
return the containing BlockNode or nil.
The given lineNr must be within a block for this to work.
This is used by the debugger, to guess reverse from a lineNumber,
to the corresponding block, in order to find out the blocks
variable names (mhmh - all of this wasnt't needed, if blocks stored
their characterPosition internally)."
|compiler tree mSource who mClass blocks
maxSoFar innerBlock m|
(line isNil or:[line == self maxLineNumber]) ifTrue:[
^ nil
].
aMethod notNil ifTrue:[
m := aMethod.
who := m who.
who isNil ifTrue:[
m isWrapped ifTrue:[
m := m wrapper.
m notNil ifTrue:[
who := m who.
]
]
].
who notNil ifTrue:[
mClass := who methodClass.
mClass isNil ifTrue:[ ^ nil].
].
mSource := m source.
mSource isNil ifTrue:[^ nil].
] ifFalse:[
aString notNil ifTrue:[
mSource := aString.
mClass := UndefinedObject
] ifFalse:[
^ nil
]
].
"create a compiler, let it parse and create the parsetree"
compiler := self for:(ReadStream on:mSource) in:mClass.
compiler parseForCode.
compiler notifying:nil.
compiler ignoreWarnings.
compiler ignoreErrors.
compiler lineNumberInfo:#full.
aMethod notNil ifTrue:[
(compiler parseMethodSpec == #Error) ifTrue:[
^ nil.
].
who notNil ifTrue:[
compiler selector ~~ (who methodSelector) ifTrue:[
^ nil
]
].
] ifFalse:[
compiler nextToken.
].
tree := compiler parseMethodBody.
(compiler errorFlag or:[tree == #Error]) ifTrue:[
^ nil
].
blocks := OrderedCollection new.
tree collectBlocksInto:blocks.
blocks := blocks select:[:aBlock |
line between: aBlock lineNumber and:aBlock endLineNumber
].
blocks size == 1 ifTrue:[
^ blocks at:1
].
nA notNil ifTrue:[
blocks := blocks select:[:aBlock |
aBlock numArgs == nA
].
blocks size == 1 ifTrue:[
^ blocks at:1
].
].
nV notNil ifTrue:[
blocks := blocks select:[:aBlock |
aBlock numVars == nV
].
blocks size == 1 ifTrue:[
^ blocks at:1
].
].
"/ look for the inner one
maxSoFar := 0.
blocks do:[:aBlock |
aBlock lineNumber > maxSoFar ifTrue:[
innerBlock := aBlock.
maxSoFar := aBlock lineNumber
]
].
^ innerBlock.
"Created: 11.1.1997 / 23:29:13 / cg"
"Modified: 14.2.1997 / 16:51:25 / cg"
!
checkMethod:aString in:aClass ignoreErrors:noErrors ignoreWarnings:noWarnings
"parse a method in a given class.
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver, args, locals,
used selectors, modified instvars, referenced classvars etc.
The noErrors and noWarnings arguments specify if error and warning
messages should be sent to the Transcript or suppressed."
|parser tree|
aString isNil ifTrue:[^ nil].
parser := self for:(ReadStream on:aString) in:aClass.
noErrors ifTrue:[
parser ignoreErrors
].
noWarnings ifTrue:[
parser ignoreWarnings
].
tree := parser parseMethod.
(parser errorFlag or:[tree == #Error]) ifTrue:[^ nil].
ReadBeforeWrittenTester searchForReadBeforeWrittenIn:tree
"
self
checkMethod:'foo
|local1 local2 local3|
local1 := local2.
^ local3
'
in:UndefinedObject
ignoreErrors:true
ignoreWarnings:true
"
"Modified: / 30.10.1997 / 16:38:31 / cg"
!
parseExpression:aString
"parse aString as an expression;
Return the parseTree (if ok), nil (for an empty string
or comment only) or #Error (syntactic error).
Error and warning messages are suppressed."
^ self
withSelf:nil
parseExpression:aString
notifying:nil
ignoreErrors:true "silence on Transcript"
ignoreWarnings:true
inNameSpace:nil
"Modified: 24.6.1997 / 16:44:00 / cg"
!
parseExpression:aString inNameSpace:aNameSpaceOrNil
"parse aString as an expression;
Return the parseTree (if ok), nil (for an empty string
or comment only) or #Error (syntactic error).
Error and warning messages are suppressed."
^ self
withSelf:nil
parseExpression:aString
notifying:nil
ignoreErrors:true "silence on Transcript"
ignoreWarnings:true
inNameSpace:aNameSpaceOrNil
"Modified: 24.6.1997 / 16:44:00 / cg"
"Created: 24.6.1997 / 16:44:26 / cg"
!
parseMethod:aString
"parse a method.
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver, args, locals,
used selectors etc.
Error and warning messages are sent to the Transcript."
^ self parseMethod:aString in:nil
"
|p|
p := Parser
parseMethod:'
foo:arg1 bar:arg2 baz:arg3
|l1 l2|
l1 := 0.
l2 := arg1.
^ self'.
'nArgs: ' print. p numberOfMethodArgs printNL.
'args: ' print. p methodArgs printNL.
'sel: ' print. p selector printNL.
'nLocal: ' print. p numberOfMethodVars printNL.
'locals: ' print. p methodVars printNL.
'tree: ' printNL. p tree printAllOn:Stdout. Stdout cr.
"
"Modified: 24.4.1996 / 13:18:02 / cg"
!
parseMethod:aString in:aClass
"parse a method in a given class.
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver, args, locals,
used selectors, modified instvars, referenced classvars etc.
Error and warning messages are sent to the Transcript."
^ self
parseMethod:aString
in:aClass
ignoreErrors:false
ignoreWarnings:false
"Modified: 24.4.1996 / 13:18:34 / cg"
!
parseMethod:aString in:aClass ignoreErrors:noErrors ignoreWarnings:noWarnings
"parse a method in a given class.
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver, args, locals,
used selectors, modified instvars, referenced classvars etc.
The noErrors and noWarnings arguments specify if error and warning
messages should be sent to the Transcript or suppressed."
|parser tree|
aString isNil ifTrue:[^ nil].
parser := self for:(ReadStream on:aString) in:aClass.
noErrors ifTrue:[
parser ignoreErrors
].
noWarnings ifTrue:[
parser ignoreWarnings
].
tree := parser parseMethod.
(parser errorFlag or:[tree == #Error]) ifTrue:[^ nil].
^ parser
"Modified: 24.4.1996 / 13:19:23 / cg"
!
parseMethod:aString in:aClass warnings:warnBoolean
"parse a method in a given class.
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver, args, locals,
used selectors, modified instvars, referenced classvars etc.
The warnBoolean arguments specifies if warning
messages should be sent to the Transcript or suppressed.
This method is OBSOLETE, and left in for backward compatibility."
self obsoleteMethodWarning.
^ self
parseMethod:aString
in:aClass
ignoreErrors:false
ignoreWarnings:warnBoolean not
"Modified: 24.4.1996 / 13:28:05 / cg"
!
parseMethodArgAndVarSpecification:aString
"parse a methods selector, arg and var spec (i.e. locals);
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver etc.
Error and warning messages are sent to the Transcript.
This method is OBSOLETE."
self obsoleteMethodWarning.
^ self parseMethodArgAndVarSpecification:aString in:nil
"
|p|
p := Parser
parseMethodArgAndVarSpecification:'
foo:arg1 bar:arg2 baz:arg3
|l1 l2|'.
'nArgs: ' print. p numberOfMethodArgs printNL.
'args: ' print. p methodArgs printNL.
'sel: ' print. p selector printNL.
'nLocal: ' print. p numberOfMethodVars printNL.
'locals: ' print. p methodVars printNL.
"
"Modified: 24.4.1996 / 13:29:43 / cg"
!
parseMethodArgAndVarSpecification:aString in:aClass
"parse a methods selector, arg and var spec in a given class;
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver, args and locals.
Error and warning messages are sent to the Transcript.
This method is OBSOLETE."
self obsoleteMethodWarning.
^ self parseMethodArgAndVarSpecification:aString
in:aClass
ignoreErrors:false
ignoreWarnings:false
parseBody:false
"Modified: 24.4.1996 / 13:30:03 / cg"
!
parseMethodArgAndVarSpecification:aString in:aClass ignoreErrors:noErrors ignoreWarnings:noWarnings parseBody:body
"parse a methods selector, arg and var spec in a given class;
If parseBody is true, also parse the statements
(for primitives & resourceSpecs).
The noErrors and noWarnings arguments specify if error and warning
messages should be sent to the Transcript or suppressed.
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver, args and locals"
|parser|
aString isNil ifTrue:[^ nil].
parser := self for:(ReadStream on:aString) in:aClass.
noErrors ifTrue:[
parser ignoreErrors
].
noWarnings ifTrue:[
parser ignoreWarnings
].
"/ parser nextToken.
(parser parseMethodSpec == #Error) ifTrue:[^ nil].
"/
"/ used to be #parseMethodBodyVarSpec
"/ - now, alternatively parse body for resource & primitive specs ..
"/
body ifTrue:[
(parser parseMethodBodyOrEmpty == #Error) ifTrue:[^ nil].
] ifFalse:[
(parser parseMethodBodyVarSpec == #Error) ifTrue:[^ nil].
].
parser errorFlag ifTrue:[^ nil].
^ parser
"Created: 24.4.1996 / 13:13:06 / cg"
"Modified: 27.4.1996 / 16:58:02 / cg"
!
parseMethodArgAndVarSpecificationSilent:aString
"parse a methods selector, arg and var spec (i.e. locals);
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver etc.
Like #parseMethodArgAndVarSpecification:, but does NOT
display error/warning messages on the transcript."
^ self parseMethodArgAndVarSpecificationSilent:aString in:nil
"Modified: 24.4.1996 / 13:30:54 / cg"
!
parseMethodArgAndVarSpecificationSilent:aString in:aClass
"parse a methods selector, arg and var spec in a given class;
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver, args and locals.
Like #parseMethodArgAndVarSpecification:in:, but does not
display error/warning messages on the transcript."
^ self parseMethodArgAndVarSpecification:aString
in:aClass
ignoreErrors:true
ignoreWarnings:true
parseBody:false
"Modified: 24.4.1996 / 13:14:27 / cg"
!
parseMethodSilent:aString
"parse a method.
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver, args, locals,
used selectors etc.
Like #parseMethod:, but warning/error messages are suppressed."
^ self parseMethodSilent:aString in:nil
"Modified: 24.4.1996 / 13:32:44 / cg"
!
parseMethodSilent:aString in:aClass
"parse a method in a given class.
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver, args, locals,
used selectors, modified instvars, referenced classvars etc.
Like #parseMethod:in:, but warning/error messages are suppressed."
^ self
parseMethod:aString
in:aClass
ignoreErrors:true
ignoreWarnings:true
"Modified: 24.4.1996 / 13:32:57 / cg"
!
parseMethodSpecification:aString
"parse a methods selector & arg specification;
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver etc."
^ self parseMethodSpecification:aString in:nil
"
|p|
p := Parser parseMethodSpecification:'foo:arg1 bar:arg2 baz:arg3'.
'nArgs: ' print. p numberOfMethodArgs printNL.
'args: ' print. p methodArgs printNL.
'sel: ' print. p selector printNL
"
!
parseMethodSpecification:aString in:aClass
"parse a methods selector & arg spec for a given class;
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver etc."
^ self parseMethodSpecification:aString
in:aClass
ignoreErrors:false
ignoreWarnings:false
!
parseMethodSpecification:aString in:aClass ignoreErrors:noErrors ignoreWarnings:noWarnings
"parse a methods selector & arg spec for a given class;
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver etc.
noErrors and noWarnings specify if error- and warningMessages are
to be output onto the Transcript."
|parser tree|
aString isNil ifTrue:[^ nil].
parser := self for:(ReadStream on:aString) in:aClass.
noErrors ifTrue:[
parser ignoreErrors
].
noWarnings ifTrue:[
parser ignoreWarnings
].
"/ parser nextToken.
tree := parser parseMethodSpec.
(parser errorFlag or:[tree == #Error]) ifTrue:[^ #Error].
^ parser
"Modified: 20.4.1996 / 20:09:48 / cg"
!
parseMethodSpecificationSilent:aString
"parse a methods selector & arg specification;
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver etc.
Like #parseMethodSpecification:, but does not display any error/warning Messages on the transcript."
^ self parseMethodSpecificationSilent:aString in:nil
!
parseMethodSpecificationSilent:aString in:aClass
"parse a methods selector & arg spec for a given class;
Return a parser (if ok), nil (empty) or #Error (syntax).
The parser can be queried for selector, receiver etc.
Like #parseMethodSpecification:in:, but does not display any error/warning Messages on the transcript."
^ self parseMethodSpecification:aString
in:aClass
ignoreErrors:true
ignoreWarnings:true
"Created: 31.10.1995 / 14:37:49 / cg"
!
selectorInExpression:aString
"parse an expression - return the selector. Even malformed expressions
(such as missing receiver or missing arg are parsed.
Used for the SystemBrowsers implementors/senders query-box initial text.
Returns nil if unparsable."
|tree parser|
(aString isNil or:[aString isEmpty]) ifTrue:[^ nil].
tree := self withSelf:nil
parseExpression:aString
notifying:nil
ignoreErrors:true
ignoreWarnings:true.
"
special: take the expression of the right side, if its an
assignment or return
"
(tree notNil and:[tree ~~ #Error]) ifTrue:[
(tree isAssignment
or:[tree isReturnNode]) ifTrue:[
tree expression isMessage ifTrue:[
tree := tree expression
]
].
tree isMessage ifTrue:[
^ tree selector
].
].
"
mhmh, try expression without receiver
"
parser := self for:(ReadStream on:aString).
parser ignoreErrors.
parser nextToken.
^ parser degeneratedKeywordExpressionForSelector
"
Parser selectorInExpression:'foo at:1 put:(5 * bar)'
Parser selectorInExpression:'(foo at:1) at:1'
Parser selectorInExpression:'a + 4'
Parser selectorInExpression:'a negated'
Parser selectorInExpression:'at:1 put:5'
Parser selectorInExpression:'at:1 put:'
Parser selectorInExpression:'a at:1 put:5'
Parser selectorInExpression:'a at:1 put:'
Parser selectorInExpression:'a := foo at:1 put:5'
"
"Modified: 17.12.1996 / 12:12:47 / cg"
!
withSelf:anObject parseExpression:aString notifying:someOne
"parse aString as an expression with self set to anObject;
Return the parseTree (if ok), nil (for an empty string
or comment only ) or #Error (syntactic error).
Errors and warnings are forwarded to someOne (usually some
codeView) which can highlight it and show a popup box."
^ self
withSelf:anObject
parseExpression:aString
notifying:someOne
ignoreErrors:false
ignoreWarnings:false
inNameSpace:nil
"Modified: 24.6.1997 / 16:43:37 / cg"
!
withSelf:anObject parseExpression:aString notifying:someOne ignoreErrors:ignore
"parse aString as an expression with self set to anObject;
Return the parseTree (if ok), nil (for an empty string
or comment only ) or #Error (syntactic error).
Errors and warnings are forwarded to someOne (usually some
codeView) which can highlight it and show a popup box."
^ self
withSelf:anObject
parseExpression:aString
notifying:someOne
ignoreErrors:ignore
ignoreWarnings:ignore
inNameSpace:nil
"Modified: 24.6.1997 / 16:43:26 / cg"
!
withSelf:anObject parseExpression:aString notifying:someOne ignoreErrors:ignoreErrors ignoreWarnings:ignoreWarnings
"parse aString as an expression with self set to anObject;
Return the parseTree (if ok), nil (for an empty string
or comment only ) or #Error (syntactic error).
Errors and warnings are forwarded to someOne (usually some
codeView) which can highlight it and show a popup box,
iff ignoreErrors/ignoreWarnings is true respectively."
^ self
withSelf:anObject
parseExpression:aString
notifying:someOne
ignoreErrors:ignoreErrors
ignoreWarnings:ignoreWarnings
inNameSpace:nil
"Modified: 24.6.1997 / 16:43:12 / cg"
!
withSelf:anObject parseExpression:aString notifying:someOne ignoreErrors:ignoreErrors ignoreWarnings:ignoreWarnings inNameSpace:aNameSpaceOrNil
"parse aString as an expression with self set to anObject;
Return the parseTree (if ok), nil (for an empty string
or comment only ) or #Error (syntactic error).
Errors and warnings are forwarded to someOne (usually some
codeView) which can highlight it and show a popup box,
iff ignoreErrors/ignoreWarnings is true respectively."
|parser tree token|
aString isNil ifTrue:[^ nil].
parser := self for:(ReadStream on:aString).
aNameSpaceOrNil notNil ifTrue:[
parser currentNameSpace:aNameSpaceOrNil
].
parser setSelf:anObject.
parser notifying:someOne.
ignoreErrors ifTrue:[parser ignoreErrors].
ignoreWarnings ifTrue:[parser ignoreWarnings].
token := parser nextToken.
(token == $^) ifTrue:[
parser nextToken.
].
tree := parser expression.
(parser errorFlag or:[tree == #Error]) ifTrue:[^ #Error].
^ tree
"Created: 24.6.1997 / 16:42:14 / cg"
! !
!Parser class methodsFor:'unparsing'!
methodSpecificationForSelector:aSelector
"given a selector such as #foo:bar:, return a string that could
serve as a methods specification source code.
To be used for code generators"
^ self methodSpecificationForSelector:aSelector
argNames:#('arg1' 'arg2' 'arg3' 'arg4' 'arg5' 'arg6'
'arg7' 'arg8' 'arg9' 'arg10' 'arg11' 'arg12'
'arg13' 'arg14' 'arg15')
"
Parser methodSpecificationForSelector:#foo:bar:
Parser methodSpecificationForSelector:#+
Parser methodSpecificationForSelector:#negated
"
!
methodSpecificationForSelector:aSelector argNames:argNames
"given a selector such as #foo:bar:, return a string that could
serve as a methods specification source code.
To be used for code generators"
|s nargs parts|
s := WriteStream on:String new.
nargs := aSelector numArgs.
nargs == 0 ifTrue:[
s nextPutAll:aSelector
] ifFalse:[
parts := aSelector partsIfSelector.
1 to:nargs do:[:i |
s nextPutAll:(parts at:i); space;
nextPutAll:(argNames at:i); space.
]
].
^ s contents
"
Parser methodSpecificationForSelector:#foo:bar: argNames:#('one' 'two' 'three')
Parser methodSpecificationForSelector:#+ argNames:#('one')
Parser methodSpecificationForSelector:#negated
"
! !
!Parser methodsFor:'ST-80 compatibility'!
evaluate:aString in:aClass to:to notifying:aRequestor ifFail:failBlock
|parseTree value|
aString isNil ifTrue:[^ nil].
self initializeFor:(ReadStream on:aString).
self setClassToCompileFor:aClass.
selfValue := nil.
requestor := aRequestor.
self nextToken.
parseTree := self parseMethodBody.
(errorFlag or:[tree == #Error]) ifTrue:[^ #Error].
parseTree notNil ifTrue:[
self evalExitBlock:[:value | ^ failBlock value].
value := parseTree evaluate
].
self release.
^ value
!
parse:methodSource in:aClass notifying:aRequestor
"parse a methods source.
Return the methods parseTree"
self initializeFor:methodSource.
classToCompileFor := aClass.
requestor := aRequestor.
self parseMethod.
^ MethodNode new
selector:selector
arguments:methodArgs
locals:methodVars
statements:tree
"Created: 17.10.1997 / 12:35:01 / cg"
"Modified: 17.10.1997 / 12:40:34 / cg"
!
parseSelector:aStringOrStream
"parse a methods source for the methods selector.
Return the selector"
self initializeFor:aStringOrStream.
self parseMethodSpec.
^ selector.
"
Parser new
parseSelector:'
parseSelector:aStringOrStream
self initializeFor:aStringOrStream.
self parseMethodSpec.
^ selector.
'
"
"Modified: 17.10.1997 / 12:35:46 / cg"
! !
!Parser methodsFor:'accessing'!
correctedSource
^ correctedSource
!
errorFlag
"return true if there where any errors (valid after parsing)"
^ errorFlag
!
evalExitBlock:aBlock
"when evaluating a return expression, this block is evaluated"
evalExitBlock := aBlock
!
getNameSpace
"retrieve the nameSpace, as found in a Namespace directive"
^ currentNamespace
"Modified: 8.11.1996 / 13:45:35 / cg"
!
primitiveNumber
"return the ST-80 style primitiveNumber or nil (valid after parsing)"
^ primitiveNr
!
primitiveResources
"return the ST-80 style resource info or nil (valid after parsing)."
^ primitiveResource
"Created: 29.5.1996 / 17:28:00 / cg"
!
release
methodArgs := methodVars := tree := selfNode := superNode := nil.
super release.
!
setNameSpace:aNameSpaceName
currentNamespace := Namespace fullName:aNameSpaceName
"Modified: 8.11.1996 / 13:43:14 / cg"
!
targetClass
^ classToCompileFor
!
targetClass:aClass
classToCompileFor := aClass
!
tree
"return the parsetree"
^tree
!
tree:aTree
"private: set the tree - for internal use only"
tree := aTree
! !
!Parser methodsFor:'error correction'!
askForCorrection:aString fromList:aList
"launch a selection box, which allows user to enter correction.
return newString or nil (for abort)"
|box|
"in systems without widgets ..."
ListSelectionBox isNil ifTrue:[
^ self confirm:aString
].
box := ListSelectionBox title:aString.
box initialText:(aList at:1).
box list:aList.
box okText:'correct'.
box action:[:aString | ^ aString].
box showAtPointer.
^ nil
!
correctByDeleting
"correct (by deleting token) if user wants to;
return #Error if there was no correction;
nil if there was one."
|selectionSize|
(self confirm:'confirm deleting') ifFalse:[^ #Error].
"
tell requestor (i.e. CodeView) about the change
this will update what the requestor shows.
"
selectionSize := requestor selection size.
requestor deleteSelection.
"
get the updated source-string
which is needed, when we eventually install the new method
"
correctedSource := requestor currentSourceCode.
source := (ReadStream on:correctedSource)
position:(source position - selectionSize).
^ nil
"Modified: / 22.1.1998 / 16:39:11 / stefan"
!
correctSelector:aSelectorString message:msg position:pos1 to:pos2
"notify error and correct if user wants to;
return #Error if there was no correction
or a ParseNode as returned by variable"
|correctIt suggestedNames newSelector|
"
sorry, but I cannot handle keywords with more than one-part
currently (too much work - maybe Ill do it later when everything else works :-)
"
(aSelectorString occurrencesOf:$:) > 1 ifTrue:[
self warning:msg position:pos1 to:pos2.
^ aSelectorString
].
correctIt := self correctableError:msg position:pos1 to:pos2.
correctIt ifFalse:[^ aSelectorString].
suggestedNames := self findBestSelectorsFor:aSelectorString.
suggestedNames notNil ifTrue:[
newSelector := self askForCorrection:'correct selector to: ' fromList:suggestedNames.
newSelector isNil ifTrue:[^ aSelectorString].
] ifFalse:[
self information:'no good correction found'.
^ aSelectorString
].
"
tell requestor (i.e. CodeView) about the change
this will update what the requestor shows.
"
requestor replaceSelectionBy:newSelector keepCursor:false.
"
get the updated source-string
which is needed, when we eventually install the new method
"
correctedSource := requestor currentSourceCode.
source := (ReadStream on:correctedSource)
position:(source position + newSelector size - aSelectorString size).
^ newSelector
"Modified: / 22.1.1998 / 16:36:04 / stefan"
!
correctVariable
"notify error and correct if user wants to;
return #Error if there was no correction
or a ParseNode as returned by variable"
|correctIt varName suggestedNames newName pos1 pos2 rslt|
pos1 := tokenPosition.
varName := tokenName.
pos2 := pos1 + varName size - 1.
"OLD:
(varName at:1) isLowercase ifTrue:[
correctIt := self undefError:varName position:pos1 to:pos2.
correctIt ifFalse:[^ #Error]
] ifFalse:[
correctIt := self warning:('''' , varName , ''' is undefined') position:pos1 to:pos2.
correctIt ifFalse:[
^ VariableNode type:#GlobalVariable name:(varName asSymbol)
]
].
"
correctIt := self undefError:varName position:pos1 to:pos2.
correctIt ifFalse:[
(varName at:1) isLowercase ifTrue:[
self warning:('adding ''' , varName , ''' as Undeclared.\\Remember to fix that later.') withCRs position:pos1 to:pos2.
^ self defineAsUndeclaredVariable:varName
] ifFalse:[
self warning:('adding ''' , varName , ''' as Global.') withCRs position:pos1 to:pos2.
^ VariableNode type:#GlobalVariable name:(varName asSymbol)
]
].
suggestedNames := self findBestVariablesFor:varName.
suggestedNames notNil ifTrue:[
newName := self askForCorrection:'correct variable to: ' fromList:suggestedNames.
newName isNil ifTrue:[^ #Error].
"
newName := suggestedNames at:1.
(self confirm:('confirm correction to: ' , newName)) ifFalse:[^ #Error]
"
] ifFalse:[
self information:'no good correction found'.
^ #Error
].
"
tell requestor (i.e. CodeView) about the change
this will update what the requestor shows.
"
requestor replaceSelectionBy:newName.
"
get the updated source-string
which is needed, when we eventually install the new method
"
correctedSource := requestor currentSourceCode.
source := (ReadStream on:correctedSource)
position:(source position + newName size - tokenName size).
"redo parse with new value"
tokenName := newName.
rslt := self variableOrError:tokenName.
"/ failed again ?
rslt == #Error ifTrue:[
"/ install as Undeclared:<name>, remember in #undeclared
rslt := self defineAsUndeclaredVariable:varName
].
^ rslt
"Modified: / 30.8.1997 / 02:17:04 / cg"
"Modified: / 22.1.1998 / 16:34:01 / stefan"
!
defineAsUndeclaredVariable:aName
"define varName as undeclared variable
(actually, it will be installed as a funny global named 'Undeclared:::<name>').
You can browse for methods with undeclareds by searching for global accesses
to 'Undeclared:::*' (or use the search-undeclared item in the launchers menu)."
|varName|
varName := aName.
"/ install as Undeclared:<name>, remember in Undeclared
(Smalltalk includesKey:#Undeclared) ifFalse:[
Smalltalk at:#Undeclared put:(IdentitySet new).
].
(Smalltalk at:#Undeclared) add:tokenName asSymbol.
varName := (Smalltalk underclaredPrefix) , tokenName.
varName := varName asSymbol.
Smalltalk at:varName put:nil.
parseForCode ifFalse:[self rememberGlobalUsed:varName].
^ VariableNode type:#GlobalVariable name:varName
"Modified: / 31.10.1997 / 01:16:03 / cg"
!
findBestSelectorsFor:aString
"collect known selectors with their spelling distances to aString;
return the 10 best suggestions"
|info n|
info := SortedCollection new.
info sortBlock:[:a :b | a value > b value].
n := 0.
Symbol allInstancesDo:[:sym |
|dist|
dist := aString spellAgainst:sym.
dist > 20 ifTrue:[
info add:(sym -> dist).
n := n + 1.
n > 10 ifTrue:[
info removeLast.
]
]
].
^ info asOrderedCollection collect:[:a | a key]
"Time millisecondsToRun:[Parser new findBestSelectorsFor:'foo']"
"Parser new findBestSelectorsFor:'findBestSel'"
"Parser new findBestSelectorsFor:'fildBestSelectrFr'"
!
findBestVariablesFor:aString
"collect known variables with their spelling distances to aString;
return the 10 best suggestions"
|names dists searchBlock args vars globalVarName "aClass className baseClass"
n instVarNames|
names := OrderedCollection new.
dists := OrderedCollection new.
"block arguments"
searchBlock := currentBlock.
[searchBlock notNil] whileTrue:[
args := searchBlock arguments.
args notNil ifTrue:[
args do:[:aBlockArg |
names add:(aBlockArg name).
dists add:(aString spellAgainst: "levenshteinTo:"(aBlockArg name))
]
].
vars := searchBlock variables.
vars notNil ifTrue:[
vars do:[:aBlockVar |
names add:(aBlockVar name).
dists add:(aString spellAgainst: "levenshteinTo:"(aBlockVar name))
]
].
searchBlock := searchBlock home
].
"method-variables"
methodVars notNil ifTrue:[
methodVarNames do:[:methodVarName |
names add:methodVarName.
dists add:(aString spellAgainst: "levenshteinTo:"methodVarName)
]
].
"method-arguments"
methodArgs notNil ifTrue:[
methodArgNames do:[:methodArgName |
names add:methodArgName.
dists add:(aString spellAgainst: "levenshteinTo:"methodArgName)
]
].
"instance-variables"
classToCompileFor notNil ifTrue:[
self classesInstVarNames do:[:instVarName |
names add:instVarName.
dists add:(aString spellAgainst: "levenshteinTo:"instVarName)
]
].
"class-variables"
classToCompileFor notNil ifTrue:[
self classesClassVarNames do:[:classVarName |
names add:classVarName.
dists add:(aString spellAgainst: "levenshteinTo:"classVarName)
].
"/ aClass := classToCompileFor.
"/ aClass isMeta ifTrue:[
"/ className := aClass name.
"/ className := className copyWithoutLast:5.
"/ baseClass := Smalltalk at:(className asSymbol).
"/ baseClass notNil ifTrue:[
"/ aClass := baseClass
"/ ]
"/ ].
"/ [aClass notNil] whileTrue:[
"/ (aClass classVarNames) do:[:classVarName |
"/ names add:classVarName.
"/ dists add:(aString spellAgainst: "levenshteinTo:"classVarName)
"/ ].
"/ aClass := aClass superclass
"/ ]
].
"globals"
Smalltalk keysDo:[:aKey |
globalVarName := aKey asString.
"only compare strings where length is about right"
((globalVarName size - aString size) abs < 3) ifTrue:[
names add:globalVarName.
dists add:(aString spellAgainst: "levenshteinTo:"globalVarName)
]
].
"misc"
#('self' 'super' 'nil' 'thisContext') do:[:name |
names add:name.
dists add:(aString spellAgainst: "levenshteinTo:"name)
].
(dists size ~~ 0) ifTrue:[
dists sortWith:names.
dists := dists reverse.
names := names reverse.
n := names size min:10.
names := names copyTo:n.
"if it starts with a lower case character, add all local & instvar names"
(aString at:1) isLowercase ifTrue:[
methodVarNames size > 0 ifTrue:[
names add:'---- method locals ----'.
methodVarNames asSortedCollection do:[:methodVarName |
names add:methodVarName.
].
].
methodArgs size > 0 ifTrue:[
names add:'---- method arguments ----'.
methodArgNames asSortedCollection do:[:methodArgName |
names add:methodArgName.
]
].
instVarNames := OrderedCollection new.
self classesInstVarNames asSortedCollection do:[:instVarName |
(instVarNames includes:instVarName) ifFalse:[
instVarNames add:instVarName.
]
].
instVarNames size > 0 ifTrue:[
names add:'---- instance variables ----'.
instVarNames do:[:instVarName |
(names includes:instVarName) ifFalse:[
names add:instVarName.
]
]
]
].
^ names
].
^ nil
"Modified: 11.1.1997 / 21:28:28 / cg"
!
selectorCheck:aSelectorString for:receiver position:pos1 to:pos2
"just a quick check: if a selector is totally unknown as a symbol,
or has the same name as a variable or cannot be understood.
Simple, but catches many typos"
|ok err sym rec superCls names recType|
"
if compiling lazy, or errors are to be ignored, or there
is no requestor, do not check
"
(LazyCompilation == true) ifTrue:[^ aSelectorString].
(ignoreErrors or:[ignoreWarnings]) ifTrue:[^ aSelectorString].
(requestor isNil or:[requestor isStream]) ifTrue:[^ aSelectorString].
err := ' is currently nowhere implemented'.
"
if the selector has the name of a variable, use another message
"
((methodVarNames notNil and:[methodVarNames includes:aSelectorString])
or:[(methodArgNames notNil and:[methodArgNames includes:aSelectorString])
or:[((names := self classesInstVarNames) notNil and:[names includes:aSelectorString])
or:[((names := self classesClassInstVarNames) notNil and:[names includes:aSelectorString])
or:[((names := self classesClassVarNames) notNil and:[names includes:aSelectorString])]]]]) ifTrue:[
err := ' is currently nowhere implemented ..
.. but a variable with that name is defined.
Missing ''.'' after the previous expression
or missing keyword/receiver before that word ?'.
].
"
check if the selector is known at all
- if not, it cannot be understood
"
ok := false.
sym := aSelectorString asSymbolIfInterned.
sym notNil ifTrue:[
ok := true.
receiver notNil ifTrue:[
"
if the receiver is a constant, we can check if it responds
to this selector
"
receiver isConstant ifTrue:[
rec := receiver evaluate.
ok := rec respondsTo:sym.
err := ' will not be understood here (message to ' , rec classNameWithArticle , ')'.
] ifFalse:[
receiver isBlock ifTrue:[
"/ this should help with typos, sending #ifTrue to blocks ...
ok := [] respondsTo:sym.
err := ' will not be understood here (message to a Block)'.
] ifFalse:[
"
if the receiver is a global, we check it too ...
"
(((recType := receiver type) == #GlobalVariable)
or:[recType == #PrivateClass]) ifTrue:[
"/ dont check autoloaded classes
"/ - it may work after loading"
rec := receiver evaluate.
(rec notNil
and:[rec isBehavior
and:[rec isLoaded not]]) ifTrue:[
^ aSelectorString
].
ok := rec respondsTo:sym.
ok ifFalse:[
"if it implements #doesNotUnderstand, assume its ok"
(rec class implements:#doesNotUnderstand:) ifTrue:[
^ aSelectorString
]
].
err := ' may not be understood here (is currently ' , rec classNameWithArticle , ')'.
] ifFalse:[
"if its a super send, we can do more checking"
receiver isSuper ifTrue:[
receiver isHere ifFalse:[
((superCls := classToCompileFor superclass) notNil
and:[(superCls whichClassIncludesSelector:sym) isNil]) ifTrue:[
err := ' is currently not implemented in any superclass'.
ok := false
]
] ifTrue:[
(classToCompileFor whichClassIncludesSelector:sym) isNil ifTrue:[
err := ' is currently not implemented in this class'.
ok := false
]
]
].
(receiver isUnaryMessage
and:[receiver selector == #class
and:[receiver receiver type == #Self]]) ifTrue:[
"its a message to self class - can check this too ..."
(classToCompileFor class whichClassIncludesSelector:sym) isNil ifTrue:[
ok := false.
classToCompileFor allSubclasses do:[:subclass |
(subclass class implements:sym) ifTrue:[
ok := true
]
].
err := ' is currently not implemented in the class'.
]
]
]
]
]
]
].
ok ifFalse:[
(receiver notNil
and:[((recType := receiver type) == #GlobalVariable)
or:[recType == #PrivateClass]]) ifTrue:[
"/ dont check autoloaded classes
"/ - it may work after loading
rec := receiver evaluate.
(rec notNil
and:[rec isBehavior
and:[rec isLoaded not]]) ifTrue:[
^ aSelectorString
].
].
"OLD: "
self warning:('#' , aSelectorString , '\\' , err) withCRs position:pos1 to:pos2
" "
"NEW: - not finished - need more interfaces
(currently produces warning output on Transcript while filing in
^ self correctSelector:aSelectorString message:('#' , aSelectorString , err) position:pos1 to:pos2
"
].
^ aSelectorString
"Modified: 5.9.1995 / 17:02:11 / claus"
"Modified: 5.1.1997 / 16:50:36 / cg"
! !
!Parser methodsFor:'error handling'!
correctableError:message position:pos1 to:pos2
"report an error which can be corrected by compiler -
return true if correction is wanted"
|correctIt|
requestor isNil ifTrue:[
self showErrorMessage:message position:pos1.
correctIt := false
] ifFalse:[
correctIt := requestor correctableError:message position:pos1 to:pos2 from:self
].
correctIt ifFalse:[
exitBlock notNil ifTrue:[exitBlock value]
].
^ correctIt
!
exitWith:something
"this is the longjump out of evaluation via a return expression"
evalExitBlock value:something
!
identifierExpectedIn:what
|msg|
(#(True False Self Nil Super ThisContext) includes:tokenType) ifTrue:[
msg := 'Reserved keyword in '
] ifFalse:[
msg := 'Identifier expected in '
].
self syntaxError:msg , what position:tokenPosition to:source position - 1.
^ #Error
!
parseError:aMessage
"report an error"
^ self parseError:aMessage position:tokenPosition to:nil
!
parseError:aMessage position:position
"report an error"
^ self parseError:aMessage position:position to:nil
!
parseError:aMessage position:position to:endPos
"report an error"
|m|
errorFlag := true.
m := 'Error: ' , aMessage.
self notifyError:m position:position to:endPos.
exitBlock notNil ifTrue:[exitBlock value].
^ false
!
showErrorMessage:aMessage position:pos
"redefined since parser can give more detailed info about
the class & selector where the error occured."
|text|
ignoreErrors ifFalse:[
Smalltalk silentLoading == true ifFalse:[
Transcript show:(pos printString).
Transcript show:' '.
selector notNil ifTrue:[
Transcript show:aMessage.
classToCompileFor notNil ifTrue:[
text := ' in ' , classToCompileFor name , '>>' , selector
] ifFalse:[
text := ' in ' , selector
]
] ifFalse:[
classToCompileFor notNil ifTrue:[
text := aMessage , ' (' , classToCompileFor name , ')'
] ifFalse:[
text := aMessage
]
].
Transcript showCR:text.
]
]
"Modified: 18.5.1996 / 15:44:15 / cg"
!
showErrorMessageForClass:aClass
"/ compiler parseError:'syntax error'.
Transcript show:' '.
aClass notNil ifTrue:[
Transcript show:aClass name , '>>'
].
selector notNil ifTrue:[
Transcript show:(selector)
].
Transcript showCR:' -> Error'.
"Created: 13.12.1995 / 20:24:34 / cg"
"Modified: 18.5.1996 / 15:44:17 / cg"
!
undefError:aName position:pos1 to:pos2
"report an undefined variable error - return true, if it should be
corrected. If not corrected, only one warning is made per undefined
variable."
|doCorrect msg idx|
warnUndeclared ifFalse:[^ false].
"
alredy warned about this one ?
"
warnedUndefVars notNil ifTrue:[
(warnedUndefVars includes:aName) ifTrue:[
"already warned about this one"
^ false
].
].
"/ (classToCompileFor notNil
"/ and:[classToCompileFor superclass notNil
"/ and:[classToCompileFor superclass instanceVariableString isNil]]) ifTrue:[
"/ self showErrorMessage:'Error: no source information (instvar names)' position:pos1.
"/ ^ false
"/ ].
(requestor isNil or:[requestor isStream]) ifTrue:[
aName first isUppercase ifFalse:[
self showErrorMessage:('Error: ''' , aName , ''' is undefined') position:pos1.
].
doCorrect := false.
] ifFalse:[
"
ask requestor for correct/continue/abort ...
it is supposed to raise abort or return true/false.
True return means that correction is wanted.
"
msg := 'Warning: ''' , aName , ''' is undefined'.
classToCompileFor notNil ifTrue:[
"is it an instance-variable marked inaccessable ?"
idx := (self classesInstVarNames) indexOf:(aName , '*') startingAt:1.
idx ~~ 0 ifTrue:[
msg := 'Warning: ' , aName , ' is a hidden instvar (not accessable from ST-code)'.
]
].
doCorrect := self correctableError:msg position:pos1 to:pos2
].
doCorrect ifFalse:[
warnedUndefVars isNil ifTrue:[
warnedUndefVars := Set new.
].
warnedUndefVars add:aName.
].
^ doCorrect
"Modified: 7.9.1997 / 02:14:36 / cg"
! !
!Parser methodsFor:'parsing'!
array
|arr elements elem pos1|
pos1 := tokenPosition.
elements := OrderedCollection new:20.
[tokenType ~~ $) ] whileTrue:[
elem := self arrayConstant.
(elem == #Error) ifTrue:[
(tokenType == #EOF) ifTrue:[
self syntaxError:'unterminated array-constant; '')'' expected'
position:pos1 to:tokenPosition
].
^ #Error
].
elements add:elem.
self nextToken
].
arr := Array withAll:elements.
(ArraysAreImmutable and:[ImmutableArray notNil]) ifTrue:[
arr changeClassTo:ImmutableArray.
].
^ arr
!
arrayConstant
(tokenType == #String) ifTrue:[
^ tokenValue
].
(tokenType == #Nil) ifTrue:[
^ nil
].
(tokenType == #Integer) ifTrue:[
^ tokenValue
].
(tokenType == #Character) ifTrue:[
^ tokenValue
].
(tokenType == #Float) ifTrue:[
^ tokenValue
].
(tokenType == #True) ifTrue:[
^ true
].
(tokenType == #False) ifTrue:[
^ false
].
(tokenType == #Error) ifTrue:[
^ #Error
].
(tokenType == #BinaryOperator) ifTrue:[
^ tokenName asSymbol
].
"/ some more special symbol consts ...
(tokenType == $| ) ifTrue:[
^ #|
].
(tokenType == #Self ) ifTrue:[
^ #'self'
].
(tokenType == #Super ) ifTrue:[
^ #'super'
].
(tokenType == #Here ) ifTrue:[
^ #'here'
].
(tokenType == #ThisContext ) ifTrue:[
^ #'thisContext'
].
(tokenType == #Keyword) ifTrue:[
^ tokenName asSymbol
].
(tokenType == #Identifier) ifTrue:[
^ tokenName asSymbol
].
(tokenType == $() ifTrue:[
self nextToken.
^ self array
].
(tokenType == $[) ifTrue:[
self nextToken.
^ self byteArray
].
(tokenType == #Symbol) ifTrue:[
"
self warning:'no # for symbols within array-constants'.
"
^ tokenValue
].
(tokenType == #HashLeftParen) ifTrue:[
"
self warning:'no # for arrays within array-constants'.
"
self nextToken.
^ self array
].
(tokenType == #HashLeftBrack) ifTrue:[
"
self warning:'no # for arrays within array-constants'.
"
self nextToken.
^ self byteArray
].
(tokenType == #EOF) ifTrue:[
"just for the better error-hilight; let caller handle error"
^ #Error
].
self syntaxError:('error in array-constant; '
, tokenType printString
, ' unexpected').
^ #Error
"Modified: 14.10.1997 / 16:31:57 / cg"
!
binaryExpression
"parse a binary-expression; return a node-tree, nil or #Error"
|receiver arg sel pos try lno note|
receiver := self unaryExpression.
(receiver == #Error) ifTrue:[^ #Error].
"special kludge: since Scanner cannot know if -digit is a binary
expression or a negative constant, handle cases here"
[(tokenType == #BinaryOperator)
or:[(tokenType == $|)
or:[((tokenType == #Integer) or:[tokenType == #Float])
and:[tokenValue < 0]]]
] whileTrue:[
pos := tokenPosition.
lno := tokenLineNr.
"kludge here: bar and minus are not scanned as binop "
(tokenType == $|) ifTrue:[
sel := '|'.
self nextToken
] ifFalse:[
(tokenType == #BinaryOperator) ifTrue:[
sel := self selectorCheck:tokenName for:receiver position:tokenPosition to:(tokenPosition + tokenName size - 1).
self nextToken
] ifFalse:[
sel := '-'.
tokenValue := tokenValue negated
]
].
arg := self unaryExpression.
(arg == #Error) ifTrue:[^ #Error].
try := BinaryNode receiver:receiver selector:sel arg:arg fold:foldConstants.
(try isMemberOf:String) ifTrue:[
self parseError:try position:pos to:tokenPosition.
errorFlag := false. "ok, user wants it - so he'll get it"
receiver := BinaryNode receiver:receiver selector:sel arg:arg fold:nil.
note := receiver plausibilityCheck.
note notNil ifTrue:[
self warning:note position:pos to:tokenPosition
].
] ifFalse:[
receiver := try
].
receiver lineNumber:lno.
receiver selectorPosition:pos.
parseForCode ifFalse:[self rememberSelectorUsed:sel].
].
^ receiver
"Modified: / 5.8.1997 / 02:51:14 / cg"
"Modified: / 9.1.1998 / 19:05:18 / stefan"
!
block
"parse a block; return a node-tree, nil or #Error"
|node args argNames arg pos lno|
lno := tokenLineNr.
self nextToken.
(tokenType == $: ) ifTrue:[
[tokenType == $:] whileTrue:[
pos := tokenPosition.
self nextToken.
(tokenType == #Identifier) ifFalse:[
^ self identifierExpectedIn:'block-arg declaration'
].
arg := Variable name:tokenName.
args isNil ifTrue:[
args := Array with:arg.
argNames := Array with:tokenName.
] ifFalse:[
(argNames includes:tokenName) ifTrue:[
self syntaxError:'redefinition of ''' , tokenName , ''' in argument list.'
position:tokenPosition
to:(tokenPosition + tokenName size - 1)
].
args := args copyWith:arg.
argNames := argNames copyWith:tokenName.
].
self nextToken
].
(tokenType ~~ $| ) ifTrue:[
"ST-80 allows [:arg ]"
(tokenType == $] ) ifTrue:[
node := BlockNode arguments:args home:currentBlock variables:nil.
node lineNumber:lno.
^ node
].
self syntaxError:'| expected after block-arg declaration'.
^ #Error
].
self nextToken
].
node := self blockBody:args.
(node notNil and:[node ~~ #Error]) ifTrue:[
node lineNumber:lno.
].
^ node
!
blockBody:args
"parse a blocks body; return a node-tree, nil or #Error"
|stats node var vars lno names|
lno := tokenLineNr.
(tokenType == $| ) ifTrue:[
self nextToken.
[tokenType == $|] whileFalse:[
(tokenType == #Identifier) ifFalse:[
^ self identifierExpectedIn:'block-var declaration'
].
var := Variable name:tokenName.
vars isNil ifTrue:[
vars := Array with:var.
names := Array with:tokenName
] ifFalse:[
(names includes:tokenName) ifTrue:[
self parseError:'redefinition of ''' , tokenName , ''' in local variables'
position:tokenPosition to:tokenPosition + tokenName size -1.
] ifFalse:[
vars := vars copyWith:var.
names := names copyWith:tokenName
]
].
self nextToken.
].
self nextToken
].
node := BlockNode arguments:args home:currentBlock variables:vars.
node lineNumber:lno.
currentBlock := node.
stats := self blockStatementList.
lineNumberInfo == #full ifTrue:[
node endLineNumber:tokenLineNr
].
node statements:stats.
currentBlock := node home.
(stats == #Error) ifTrue:[^ #Error].
^ node
"Modified: 21.10.1996 / 14:48:56 / cg"
!
blockExpression
"parse a blockExpression; return a node-tree, nil or #Error.
Not used by ST/X's parser, but added for ST-80 compatibility."
tokenType ~~ $[ ifTrue:[
self syntaxError:'[ expected'.
^ #Error.
].
^ self block
!
blockStatementList
"parse a blocks statementlist; return a node-tree, nil or #Error"
|thisStatement prevStatement firstStatement|
(tokenType == $] ) ifTrue:[^ nil].
thisStatement := self statement.
(thisStatement == #Error) ifTrue:[^ #Error].
firstStatement := thisStatement.
[tokenType == $] ] whileFalse:[
(tokenType == $.) ifFalse:[
((tokenType == #EOF) or:[tokenType == $)]) ifTrue:[
self syntaxError:'missing '']'' in block'
] ifFalse:[
self syntaxError:'missing ''.'' in block'
].
^ #Error
] ifTrue:[
prevStatement := thisStatement.
self nextToken.
tokenType == $] ifTrue:[
"
*** I had a warning here (since it was not defined
*** in the blue-book; but PD-code contains a lot of
*** code with periods at the end so that the warnings
*** became annoying
self warning:'period after last statement in block'.
"
^ firstStatement
].
thisStatement := self statement.
(thisStatement == #Error) ifTrue:[^ #Error].
prevStatement nextStatement:thisStatement
]
].
^ firstStatement
!
byteArray
"started with ST-80 R4 - allow byteArray constants as #[ ... ]"
|bytes index limit newArray elem pos1 pos2|
pos1 := tokenPosition.
bytes := ByteArray uninitializedNew:5000.
index := 0. limit := 5000.
[tokenType ~~ $] ] whileTrue:[
pos2 := tokenPosition.
"
this is not good programming style, but speeds up
reading of huge byte arrays (i.e. stored Images ...)
"
(tokenType == #Integer) ifTrue:[
elem := tokenValue
] ifFalse:[
elem := self arrayConstant.
(elem == #Error) ifTrue:[
(tokenType == #EOF) ifTrue:[
self syntaxError:'unterminated bytearray-constant; '']'' expected'
position:pos1 to:tokenPosition
].
^ #Error
].
].
((elem isMemberOf:SmallInteger) and:[elem between:0 and:255]) ifTrue:[
index := index + 1.
bytes at:index put:elem.
index == limit ifTrue:[
newArray := ByteArray uninitializedNew:(limit * 2).
newArray replaceFrom:1 to:limit with:bytes startingAt:1.
limit := limit * 2.
bytes := newArray
].
] ifFalse:[
self parseError:'invalid ByteArray element' position:pos2 to:tokenPosition - 1
].
self nextToken.
].
newArray := ByteArray uninitializedNew:index.
newArray replaceFrom:1 to:index with:bytes startingAt:1.
^ newArray
!
degeneratedKeywordExpressionForSelector
"parse a keyword-expression without receiver - for the selector
only. return the selector or nil. This is not used in normal parsing,
but instead to extract the selector from a code fragment.
(for example, the system browsers implementors-function uses this)"
|sel arg rec|
(tokenType == #Keyword) ifTrue:[
sel := tokenName.
self nextToken.
arg := self binaryExpression.
(arg == #Error) ifTrue:[^ sel].
[tokenType == #Keyword] whileTrue:[
sel := sel , tokenName.
self nextToken.
arg := self binaryExpression.
(arg == #Error) ifTrue:[^ sel].
].
^ sel
].
(rec := self primary) ~~ #Error ifTrue:[
sel := self degeneratedKeywordExpressionForSelector.
sel isNil ifTrue:[
rec isMessage ifTrue:[
sel := rec selector
] ifFalse:[
rec isAssignment ifTrue:[
rec expression isMessage ifTrue:[
sel := rec expression selector
]
]
]
]
].
^ sel
!
expression
"parse a cascade-expression; return a node-tree, nil or #Error.
expression ::= keywordExpression
| keywordExpression cascade
cascade ::= ';' expressionSendPart
| cascade ';' expressionSendPart
expressionSendPart ::= { KEYWORD binaryExpression }
| BINARYOPERATOR unaryExpression
| IDENTIFIER
"
|receiver arg sel args pos pos2 lno|
pos := tokenPosition.
receiver := self keywordExpression.
(receiver == #Error) ifTrue:[^ #Error].
(tokenType == $;) ifTrue:[
[tokenType == $;] whileTrue:[
receiver isMessage ifFalse:[
self syntaxError:'left side of cascade must be a message expression'
position:pos to:tokenPosition
].
self nextToken.
(tokenType == #Identifier) ifTrue:[
sel := self selectorCheck:tokenName for:receiver position:tokenPosition to:(tokenPosition + tokenName size - 1).
receiver := CascadeNode receiver:receiver selector:sel.
receiver lineNumber:tokenLineNr.
parseForCode ifFalse:[self rememberSelectorUsed:sel].
self nextToken.
] ifFalse:[
(tokenType == #BinaryOperator) ifTrue:[
sel := self selectorCheck:tokenName for:receiver position:tokenPosition to:(tokenPosition + tokenName size - 1).
lno := tokenLineNr.
self nextToken.
arg := self unaryExpression.
(arg == #Error) ifTrue:[^ #Error].
receiver := CascadeNode receiver:receiver selector:sel arg:arg.
receiver lineNumber:lno.
parseForCode ifFalse:[self rememberSelectorUsed:sel].
] ifFalse:[
(tokenType == #Keyword) ifTrue:[
pos := tokenPosition.
lno := tokenLineNr.
sel := tokenName.
self nextToken.
arg := self binaryExpression.
(arg == #Error) ifTrue:[^ #Error].
args := Array with:arg.
[tokenType == #Keyword] whileTrue:[
sel := sel , tokenName.
self nextToken.
arg := self binaryExpression.
(arg == #Error) ifTrue:[^ #Error].
args := args copyWith:arg.
pos2 := tokenPosition
].
sel := self selectorCheck:sel for:receiver position:pos to:pos2.
receiver := CascadeNode receiver:receiver selector:sel args:args.
receiver lineNumber:lno.
parseForCode ifFalse:[self rememberSelectorUsed:sel].
] ifFalse:[
(tokenType == #Error) ifTrue:[^ #Error].
self syntaxError:('invalid cascade; ' , tokenType printString , ' unexpected')
position:tokenPosition to:source position - 1.
^ #Error
]
]
]
].
"obscure (unspecified ?) if selector follows; Question:
is
'expr sel1; sel2 sel3'
to be parsed as:
(t := expr.
t sel1.
t sel2) sel3
or:
(t := expr.
t sel1.
t sel2 sel3)
"
((tokenType == #Identifier)
or:[(tokenType == #BinaryOperator)
or:[tokenType == #Keyword]]) ifTrue:[
self syntaxError:'ambigous cascade - please group using ( ...)'
position:tokenPosition to:source position - 1.
^ #Error
]
].
^ receiver
!
inWhichClassIsClassInstVar:aString
"search class-chain for the class-instance variable named aString
- return the class or nil if not found"
|aClass|
aClass := classToCompileFor.
[aClass notNil] whileTrue:[
(aClass class instVarNames includes:aString) ifTrue:[ ^ aClass].
aClass := aClass superclass
].
^ nil
"Modified: 4.1.1997 / 14:42:15 / cg"
!
inWhichClassIsClassVar:aString
"search class-chain for the classvariable named aString
- return the class or nil if not found"
|aClass className baseClass|
aClass := classToCompileFor.
aClass isMeta ifTrue:[
className := aClass name copyWithoutLast:6.
baseClass := Smalltalk at:(className asSymbol).
baseClass notNil ifTrue:[
aClass := baseClass
]
].
^ aClass whichClassDefinesClassVar:aString
"/ [aClass notNil] whileTrue:[
"/ (aClass classVarNames includes:aString) ifTrue:[ ^ aClass].
"/ aClass := aClass superclass
"/ ].
"/ ^ nil
"Modified: 17.6.1996 / 17:18:41 / stefan"
"Modified: 4.1.1997 / 15:57:11 / cg"
!
keywordExpression
"parse a keyword-expression; return a node-tree, nil or #Error.
keywordExpression ::= binaryexpression
| { KEYWORD-PART binaryExpression }
"
|receiver sel arg args posR1 posR2 pos1 pos2 try lno note|
posR1 := tokenPosition.
receiver := self binaryExpression.
(receiver == #Error) ifTrue:[^ #Error].
(tokenType == #Keyword) ifTrue:[
pos1 := posR2 := tokenPosition.
pos2 := tokenPosition + tokenName size - 1.
sel := tokenName.
lno := tokenLineNr.
self nextToken.
arg := self binaryExpression.
(arg == #Error) ifTrue:[^ #Error].
args := Array with:arg.
[tokenType == #Keyword] whileTrue:[
sel := sel , tokenName.
pos2 := tokenPosition + tokenName size - 1.
self nextToken.
arg := self binaryExpression.
(arg == #Error) ifTrue:[^ #Error].
args := args copyWith:arg.
].
sel := self selectorCheck:sel for:receiver position:pos1 to:pos2.
try := MessageNode receiver:receiver selector:sel args:args fold:foldConstants.
(try isMemberOf:String) ifTrue:[
self parseError:try position:pos1 to:pos2.
errorFlag := false. "ok, user wants it - so he'll get it"
receiver := MessageNode receiver:receiver selector:sel args:args fold:nil.
note := receiver plausibilityCheck.
note notNil ifTrue:[
self warning:note position:pos1 to:pos2
].
] ifFalse:[
receiver := try
].
receiver lineNumber:lno.
parseForCode ifFalse:[self rememberSelectorUsed:sel].
(sel = #and:
or:[sel = #or:]) ifTrue:[
receiver arg1 isBlock ifFalse:[
self warnCommonMistake:'(possible common mistake) missing block brackets ?'
position:pos2+1 to:tokenPosition-1
]
].
(sel = #whileTrue:
or:[sel = #whileFalse:]) ifTrue:[
receiver receiver isBlock ifFalse:[
self warnCommonMistake:'(possible common mistake) missing block brackets ?'
position:posR1 to:posR2-1
]
].
].
^ receiver
"Modified: 18.7.1996 / 10:33:26 / cg"
!
parseMethod
"parse a method.
Return the parseTree or #Error.
method ::= methodSpec methodBody
"
|parseTree|
"/ self nextToken.
(self parseMethodSpec == #Error) ifTrue:[^ #Error].
parseTree := self parseMethodBody.
(parseTree == #Error) ifFalse:[
self tree:parseTree
].
^ parseTree
"Modified: 20.4.1996 / 20:09:26 / cg"
!
parseMethodBody
"parse a methods body (locals & statements).
No more tokens may follow.
Return a node-tree, or #Error
methodBody ::= '<' st80Primitive '>' #EOF
| '<' st80Primitive '>' methodBodyVarSpec statementList #EOF
"
|stats|
classToCompileFor notNil ifTrue:[
stats := self parseMethodBodyOrEmpty.
] ifFalse:[
stats := self parseMethodBodyOrEmpty.
].
(stats == #Error) ifFalse:[
(tokenType ~~ #EOF) ifTrue:[
"/ just for the nicer error message
(#(Self Nil True False Super Here) includes:tokenType) ifTrue:[
self parseError:tokenName , ' unexpected (missing ''.'' before ' , tokenName , ' ?)'
position:tokenPosition to:(tokenPosition + tokenName size - 1)
] ifFalse:[
self parseError:(tokenType printString , ' unexpected (missing ''.'' or selector before it ?)')
position:tokenPosition to:source position-1.
].
^#Error
]
].
^ stats
"Modified: 14.10.1997 / 20:53:17 / cg"
!
parseMethodBodyOrEmpty
"parse a methods body (locals & statements);
return a node-tree, nil or #Error.
empty (or comment only) input is accepted and returns nil.
methodBodyOrNil ::= '<' st80Primitive '>'
| '<' st80Primitive '>' methodBodyVarSpec statementList
| <empty>
"
|stats|
(self parseMethodBodyVarSpec == #Error) ifTrue:[^ #Error].
(tokenType ~~ #EOF) ifTrue:[
stats := self statementList
].
^ stats
"Modified: 27.4.1996 / 16:57:56 / cg"
!
parseMethodBodyVarSpec
"parse a methods local variable specification, handling
possible primitive or resourceSpecs.
.
Leave spec of locals in methodLocals as a side effect.
Return #Error or nil.
methodBodyVarSpec ::= '|' { IDENTIFIER } '|'
| <empty>
"
|var pos msg|
((tokenType == #BinaryOperator) and:[tokenName = '<']) ifTrue:[
self parsePrimitiveOrResourceSpecOrEmpty.
].
(tokenType == $|) ifTrue:[
"memorize position for declaration in correction"
localVarDefPosition := tokenPosition.
self nextToken.
pos := tokenPosition.
[tokenType == #Identifier] whileTrue:[
var := Variable name:tokenName.
methodVars isNil ifTrue:[
methodVars := OrderedCollection with:var.
methodVarNames := OrderedCollection with:tokenName
] ifFalse:[
(methodVarNames includes:tokenName) ifTrue:[
self parseError:'redefinition of ''' , tokenName , ''' in local variables'
position:tokenPosition to:tokenPosition + tokenName size -1.
] ifFalse:[
methodVars add:var.
methodVarNames add:tokenName
]
].
methodArgNames notNil ifTrue:[
(methodArgNames includes:tokenName) ifTrue:[
self warning:'local variable ''' , tokenName , ''' hides argument.'
position:tokenPosition
to:(tokenPosition + tokenName size - 1)
]
].
self nextToken.
pos := tokenPosition
].
(tokenType ~~ $|) ifTrue:[
(#(True False Self Nil Super ThisContext) includes:tokenType) ifTrue:[
msg := 'Reserved keyword in local var declaration'
] ifFalse:[
msg := 'Identifier or | expected in local var declaration'
].
self syntaxError:msg position:tokenPosition to:source position-1.
^ #Error
].
self nextToken
].
^ nil
"Modified: 25.6.1997 / 15:45:35 / cg"
!
parseMethodSpec
"parse a methods selector & arg specification;
Set selector and methodArgs in the receiver as a side effect.
Return the receiver or #Error.
methodSpec ::= { KEYWORD IDENTIFIER }
| binaryOperator IDENTIFIER
| IDENTIFIER
"
|var|
tokenType isNil ifTrue:[
self nextToken.
].
(tokenType == #Keyword) ifTrue:[
selector := ''.
[tokenType == #Keyword] whileTrue:[
selector := selector , tokenName.
self nextToken.
(tokenType ~~ #Identifier) ifTrue:[^ #Error].
var := Variable name:tokenName.
methodArgs isNil ifTrue:[
methodArgs := Array with:var.
methodArgNames := Array with:tokenName
] ifFalse:[
(methodArgNames includes:tokenName) ifTrue:[
self syntaxError:'redefinition of ''' , tokenName , ''' in argument list.'
position:tokenPosition
to:(tokenPosition + tokenName size - 1)
].
methodArgs := methodArgs copyWith:var.
methodArgNames := methodArgNames copyWith:tokenName
].
self nextToken
].
selector := selector asSymbol.
^ self
].
(tokenType == #Identifier) ifTrue:[
selector := tokenName asSymbol.
self nextToken.
^ self
].
"/ special handling for |, which is also a lexical token
tokenType == $| ifTrue:[
tokenType := #BinaryOperator.
tokenName := '|'
].
(tokenType == #BinaryOperator) ifTrue:[
selector := tokenName asSymbol.
self nextToken.
(tokenType ~~ #Identifier) ifTrue:[^ #Error].
var := Variable name:tokenName.
"/ methodArgs isNil ifTrue:[
methodArgs := Array with:var.
methodArgNames := Array with:tokenName.
"/ ] ifFalse:[
"/ methodArgs := methodArgs copyWith:var.
"/ methodArgNames := methodArgNames copyWith:tokenName
"/ ].
self nextToken.
^ self
].
^ #Error
"Modified: 3.1.1997 / 16:18:04 / cg"
!
parsePrimitiveOrResourceSpecOrEmpty
"parse a methods primitive or resource spec"
|pos wmsg primNr|
[(tokenType == #BinaryOperator) and:[tokenName = '<']] whileTrue:[
"/ an ST-80 primitive or resourceSpec - parsed but ignored
pos := tokenPosition.
self nextToken.
primNr := self parseST80Primitive.
(primNr == #Error) ifTrue:[^ #Error].
wmsg := nil.
primNr < 0 ifTrue:[
WarnST80Directives == true ifTrue:[
wmsg := 'ST-80 directive ignored'.
].
] ifFalse:[
primitiveNr := primNr.
wmsg := 'ST-80 primitive may not work'
].
wmsg notNil ifTrue:[self warning:wmsg position:pos]
].
"Created: 27.4.1996 / 16:55:55 / cg"
"Modified: 29.5.1996 / 17:25:52 / cg"
!
parseST80Primitive
"parse an ST-80 type primitive as '< primitive: nr >';
return primitive number or #Error.
Also, ST-80 style resource specs are parsed; the result is
left (as side effect) in primitiveResource.
(maybe someone else knows what to do with it ...)
Well, as we now have this mechanism, I'll use it to mark methods which
do keyboard processing ... <resource: keyboard ( keys )>
For faster finding of used keyboard accelerators.
st80Primitive ::= 'primitive:' INTEGER
st80Primitive ::= 'resource:' SYMBOL - ignored; leave SYMBOL in primitiveResource
st80Primitive ::= 'resource:' SYMBOL (...) - ignored; leave (SYMBOL (...)) in primitiveResource
"
|primNumber keys resource resourceValue|
(tokenType ~~ #Keyword) ifTrue:[
self parseError:'bad primitive definition (keyword expected)'.
^ #Error
].
(tokenName = 'primitive:') ifTrue:[
self nextToken.
(tokenType == #Integer) ifFalse:[
self parseError:'primitive number expected'.
^ #Error
].
primitiveNr notNil ifTrue:[
self parseError:'only one primitive spec allowed'.
primNumber := -1.
] ifFalse:[
primNumber := tokenValue.
].
self nextToken.
] ifFalse:[
(tokenName = 'resource:') ifTrue:[
self nextToken.
(tokenType ~~ #Symbol) ifTrue:[
self parseError:'symbol expected'.
^ #Error
].
primNumber := -1.
resource := tokenValue.
resourceValue := true.
self nextToken.
tokenType == $( ifTrue:[
self nextToken.
keys := OrderedCollection new.
[tokenType == $) ] whileFalse:[
keys add:tokenValue.
self nextToken.
].
resourceValue := keys.
self nextToken.
].
primitiveResource isNil ifTrue:[
primitiveResource := IdentityDictionary new.
].
primitiveResource at:(resource asSymbol) put:resourceValue.
] ifFalse:[
self parseError:'unrecognized primitive'.
^ #Error
].
].
((tokenType == #BinaryOperator) and:[tokenName = '>']) ifFalse:[
self parseError:'bad primitive definition (> expected)'.
^ #Error
].
self nextToken.
^ primNumber
"Modified: 29.5.1996 / 17:24:09 / cg"
!
primary
"parse a primary-expression; return a node-tree, nil or #Error"
|val var expr pos name t cls nameSpace nameSpaceGlobal globlName lnr node
pos2 eMsg|
pos := tokenPosition.
(tokenType == #Self) ifTrue:[
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'assignment to self' position:pos to:tokenPosition.
^ #Error
].
selfNode isNil ifTrue:[
selfNode := SelfNode value:selfValue
].
^ selfNode
].
(tokenType == #Identifier) ifTrue:[
"
must check for variable first, to be backward compatible
with other smalltalks.
"
tokenName = 'here' ifTrue:[
(self variableOrError:tokenName) == #Error ifTrue:[
tokenType := #Here.
warnSTXHereExtensionUsed ifTrue:[
self warning:'here-sends are a nonstandard feature of ST/X'
position:pos to:pos+3.
"
only warn once
"
warnSTXHereExtensionUsed := false
]
]
]
].
(tokenType == #Identifier) ifTrue:[
name := tokenName.
var := self variable.
(var == #Error) ifTrue:[
errorFlag := true
].
self nextToken.
(tokenType == #'::') ifTrue:[
globlName := name.
"is it in a namespace ?"
nameSpace := self findNameSpaceWith:globlName.
nameSpace notNil ifTrue:[
globlName := nameSpace name , '::' , globlName
].
[tokenType == #'::'] whileTrue:[
nameSpace := globlName.
self nextToken.
(tokenType == #Identifier) ifTrue:[
ignoreWarnings ifFalse:[
warnSTXNameSpaceUse ifTrue:[
self warning:'nameSpaces are a nonstandard feature of ST/X'
position:pos to:(source position).
"
only warn once
"
warnSTXNameSpaceUse := false
]
].
name := tokenName.
globlName := (nameSpace , '::' , name).
nameSpaceGlobal := Smalltalk at:nameSpace asSymbol ifAbsent:nil.
nameSpaceGlobal isNil ifTrue:[
self warning:('unknown nameSpace: ', nameSpace)
position:pos to:tokenPosition-1.
"/ self parseError:('unknown nameSpace: ', nameSpace) position:pos to:tokenPosition-1.
"/ errorFlag := true
] ifFalse:[
nameSpaceGlobal isNamespace ifTrue:[
"/ for now: only Smalltalk is allowed
nameSpaceGlobal ~~ Smalltalk ifTrue:[
"/ self parseError:('(currently) the only valid nameSpace is `Smalltalk''') position:pos to:tokenPosition-1.
"/ errorFlag := true
] ifFalse:[
globlName := name
].
] ifFalse:[
nameSpaceGlobal isBehavior ifFalse:[
self parseError:('invalid nameSpace: ' , nameSpace) position:pos to:tokenPosition-1.
errorFlag := true
] ifTrue:[
(nameSpaceGlobal privateClassesAt:name asSymbol) isNil ifTrue:[
self warning:('no private class: ' , name , ' in class: ' , nameSpace)
position:pos to:tokenPosition-1.
"/ self parseError:('no private class: ' , name , ' in class: ' , nameSpace) position:pos to:tokenPosition-1.
"/ errorFlag := true
]
]
].
].
self nextToken.
].
var := VariableNode
type:#GlobalVariable
name:globlName asSymbol.
parseForCode ifFalse:[self rememberGlobalUsed:globlName].
]
].
((tokenType == $_) or:[tokenType == #':=']) ifFalse:[
^ var
].
"/ careful: it could already be an implicit self send
ImplicitSelfSends ifTrue:[
var isMessage ifTrue:[
self nextToken.
expr := self expression.
(errorFlag or:[expr == #Error]) ifTrue:[^ #Error].
selfNode isNil ifTrue:[
selfNode := SelfNode value:selfValue
].
^ MessageNode receiver:selfNode selector:('implicit_' , name , ':') asSymbol arg:expr.
].
].
(var ~~ #Error) ifTrue:[
t := var type.
(t ~~ #MethodVar) ifTrue:[
(t == #PrivateClass) ifTrue:[
self parseError:'assignment to private class' position:pos to:tokenPosition.
errorFlag := true
] ifFalse:[
(t == #MethodArg) ifTrue:[
self parseError:'assignment to method argument' position:pos to:tokenPosition.
errorFlag := true
] ifFalse:[
(t == #BlockArg) ifTrue:[
self parseError:'assignment to block argument' position:pos to:tokenPosition.
errorFlag := true
] ifFalse:[
(t == #InstanceVariable) ifTrue:[
name := self classesInstVarNames at:(var index).
"/ ca once did this to `name' and wondered what happened to his class ...
"/ (not really a beginners bug, but may happen as a typo or missing local variable;
"/ and is hard to track down later)
warnCommonMistakes ifTrue:[
classToCompileFor isMeta ifTrue:[
(classToCompileFor isSubclassOf:Class) ifTrue:[
(Class allInstVarNames includes:(var name)) ifTrue:[
self warning:'assignment to a classInstanceVariable\(see hierarchy of `Class'')' withCRs position:pos to:tokenPosition+1.
]
]
]
].
parseForCode ifFalse:[
modifiedInstVars isNil ifTrue:[
modifiedInstVars := Set new
].
modifiedInstVars add:name
]
] ifFalse:[
(t == #ClassVariable) ifTrue:[
name := var name.
name := name copyFrom:((name indexOf:$:) + 1).
parseForCode ifFalse:[
modifiedClassVars isNil ifTrue:[
modifiedClassVars := Set new
].
modifiedClassVars add:name
]
] ifFalse:[
(t == #GlobalVariable) ifTrue:[
(cls := Smalltalk classNamed:var name) notNil ifTrue:[
cls name = var name ifTrue:[
self warning:'assignment to global which refers to a class' position:pos to:tokenPosition.
]
].
parseForCode ifFalse:[
modifiedGlobals isNil ifTrue:[
modifiedGlobals := Set new
].
modifiedGlobals add:var name
]
]
]
]
]
]
]
].
].
lnr := tokenLineNr.
self nextToken.
pos2 := tokenPosition.
expr := self expression.
"/ a typical beginner error:
"/ expr ifTrue:[
"/ var := super
"/ ] ifFalse:[
"/ var := something-else
"/ ].
"/ var messageSend
"/
"/ does not what a beginner might think.
warnCommonMistakes ifTrue:[
(expr ~~ #Error and:[expr isSuper]) ifTrue:[
self warning:'followup messageSends to `' , var name , ''' will have normal send semantics\(i.e. NO super- or here-sends). Use self to avoid confusion.' withCRs position:pos to:pos2.
].
].
(errorFlag or:[expr == #Error]) ifTrue:[^ #Error].
node := AssignmentNode variable:var expression:expr.
(lineNumberInfo == #full) ifTrue:[node lineNr:lnr].
^ node
].
((tokenType == #Integer)
or:[(tokenType == #String)
or:[(tokenType == #Character)
or:[(tokenType == #Float)
or:[(tokenType == #Symbol)]]]]) ifTrue:[
val := ConstantNode type:tokenType value:tokenValue.
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'assignment to a constant' position:pos to:tokenPosition.
^ #Error
].
^ val
].
(tokenType == #Nil) ifTrue:[
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'assignment to nil' position:pos to:tokenPosition.
^ #Error
].
^ ConstantNode type:#Nil value:nil
].
(tokenType == #True) ifTrue:[
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'assignment to true' position:pos to:tokenPosition.
^ #Error
].
^ ConstantNode type:#True value:true
].
(tokenType == #False) ifTrue:[
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'assignment to false' position:pos to:tokenPosition.
^ #Error
].
^ ConstantNode type:#False value:false
].
(tokenType == #Super) ifTrue:[
usesSuper := true.
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'assignment to super' position:pos to:tokenPosition.
^ #Error
].
(classToCompileFor isNil or:[classToCompileFor superclass isNil]) ifTrue:[
self warning:'superclass is (currently ?) nil' position:pos to:(pos + 4).
].
superNode isNil ifTrue:[
superNode := SuperNode value:selfValue inClass:classToCompileFor
].
^ superNode
].
(tokenType == #Here) ifTrue:[
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'assignment to here' position:pos to:tokenPosition.
^ #Error
].
classToCompileFor isNil ifTrue:[
self warning:'in which class are you ?' position:pos to:(pos + 3).
].
^ SuperNode value:selfValue inClass:classToCompileFor here:true
].
(tokenType == #ThisContext) ifTrue:[
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'assignment to thisContext' position:pos to:tokenPosition.
^ #Error
].
contextToEvaluateIn notNil ifTrue:[
^ VariableNode type:#ThisContext context:contextToEvaluateIn
] ifFalse:[
^ VariableNode type:#ThisContext
]
].
(tokenType == #HashLeftParen) ifTrue:[
self nextToken.
val := self array.
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'assignment to a constant' position:pos to:tokenPosition.
^ #Error
].
^ ConstantNode type:#Array value:val
].
(tokenType == #HashLeftBrack) ifTrue:[
self nextToken.
val := self byteArray.
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'assignment to a constant' position:pos to:tokenPosition.
^ #Error
].
^ ConstantNode type:#Array value:val
].
(tokenType == $() ifTrue:[
self nextToken.
val := self expression.
(val == #Error) ifTrue:[^ #Error].
(tokenType ~~ $) ) ifTrue:[
tokenType isCharacter ifTrue:[
eMsg := 'missing '')'' (i.e. ''' , tokenType asString , ''' unexpected)'.
] ifFalse:[
eMsg := 'missing '')'''.
].
self syntaxError:eMsg withCRs position:pos to:tokenPosition.
^ #Error
].
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'invalid assignment' position:pos to:tokenPosition.
^ #Error
].
val parenthized:true.
^ val
].
(tokenType == $[ ) ifTrue:[
val := self block.
self nextToken.
((tokenType == $_) or:[tokenType == #':=']) ifTrue:[
self parseError:'invalid assignment' position:pos to:tokenPosition.
^ #Error
].
^ val
].
(tokenType == #Primitive) ifTrue:[
self nextToken.
node := PrimitiveNode code:tokenValue.
hasNonOptionalPrimitiveCode := true.
hasPrimitiveCode := true.
^ node
].
(tokenType == #Error) ifTrue:[^ #Error].
tokenType isCharacter ifTrue:[
self syntaxError:('error in primary; '
, tokenType printString ,
' unexpected') position:tokenPosition to:tokenPosition
] ifFalse:[
(#(BinaryOperator Keyword) includes:tokenType) ifTrue:[
eMsg := ('error in primary; '
, tokenType printString , '(' , tokenName , ') ' ,
' unexpected')
] ifFalse:[
eMsg := ('error in primary; '
, tokenType printString ,
' unexpected')
].
self syntaxError:eMsg
].
^ #Error
"Created: / 13.9.1995 / 12:50:50 / claus"
"Modified: / 16.2.1998 / 14:11:12 / cg"
!
statement
"parse a statement; return a node-tree or #Error.
statement ::= '^' expression
| PRIMITIVECODE
| expression
"
|expr node lnr|
(tokenType == $^) ifTrue:[
lnr := tokenLineNr.
self nextToken.
expr := self expression.
(expr == #Error) ifTrue:[^ #Error].
node := ReturnNode expression:expr.
node home:self blockHome:currentBlock.
(lineNumberInfo == #full) ifTrue:[node lineNr:lnr].
^ node
].
(tokenType == #Primitive) ifTrue:[
self nextToken.
node := PrimitiveNode code:tokenValue.
node isOptional ifFalse:[
hasNonOptionalPrimitiveCode := true
].
hasPrimitiveCode := true.
^ node
].
(tokenType == #EOF) ifTrue:[
self syntaxError:'period after last statement'.
^ #Error
].
expr := self expression.
(expr == #Error) ifTrue:[^ #Error].
"/ classToCompileFor notNil ifTrue:[
"/ currentBlock isNil ifTrue:[
"/ expr isPrimary ifTrue:[
"/ self warning:'useless computation - missing ^ ?'
"/ ]
"/ ]
"/ ].
node := StatementNode expression:expr.
(lineNumberInfo == #full) ifTrue:[node lineNr:lnr].
^ node
"Modified: 14.4.1997 / 20:45:41 / cg"
!
statementList
"parse a statementlist; return a node-tree, nil or #Error.
Statements must be separated by periods.
statementList ::= <statement>
| <statementList> . <statement>
"
|thisStatement prevStatement firstStatement correctIt periodPos
prevExpr|
thisStatement := self statement.
(thisStatement == #Error) ifTrue:[^ #Error].
firstStatement := thisStatement.
[tokenType == $.] whileTrue:[
prevExpr := thisStatement expression.
(prevExpr notNil and:[prevExpr isMessage]) ifTrue:[
(#(#'=' #'==') includes:prevExpr selector) ifTrue:[
self warning:'useless computation - mistyped assignment ?'
].
].
periodPos := tokenPosition.
self nextToken.
(tokenType == $]) ifTrue:[
currentBlock isNil ifTrue:[
self parseError:'block nesting error'.
errorFlag := true
"
*** I had a warning here (since it was not defined
*** in the blue-book; but PD-code contains a lot of
*** code with periods at the end so that the warnings
*** became annoying
] ifFalse:[
self warning:'period after last statement' position:periodPos
"
].
^ firstStatement
].
(tokenType == #EOF) ifTrue:[
currentBlock notNil ifTrue:[
self parseError:'block nesting error (expected '']'')'.
errorFlag := true
"
*** I had a warning here (since it was not defined
*** in the blue-book; but PD-code contains a lot of
*** code with periods at the end so that the warnings
*** became annoying
] ifFalse:[
self warning:'period after last statement' position:periodPos
"
].
^ firstStatement
].
prevStatement := thisStatement.
prevStatement isReturnNode ifTrue:[
self warning:'statements after return' position:tokenPosition
].
"
periodPos := tokenPosition.
self nextToken.
"
((tokenType == $]) or:[tokenType == #EOF]) ifTrue:[
(currentBlock isNil and:[tokenType == $]]) ifTrue:[
self parseError:'block nesting error'.
errorFlag := true
] ifFalse:[
correctIt := self correctableError:'period after last statement in block'
position:periodPos to:(periodPos + 1).
correctIt ifTrue:[
(self correctByDeleting == #Error) ifTrue:[
errorFlag := true
]
]
].
^ firstStatement
].
thisStatement := self statement.
(thisStatement == #Error) ifTrue:[^ #Error].
prevStatement nextStatement:thisStatement
].
^ firstStatement
"Modified: 14.4.1997 / 20:46:46 / cg"
!
unaryExpression
"parse a unary-expression; return a node-tree, nil or #Error"
|receiver sel pos pos2 try|
receiver := self primary.
(receiver == #Error) ifTrue:[^ #Error].
[tokenType == #Identifier] whileTrue:[
pos := tokenPosition.
pos2 := pos + tokenName size - 1.
sel := self selectorCheck:tokenName for:receiver position:pos to:pos2.
try := UnaryNode receiver:receiver selector:sel fold:foldConstants.
(try isMemberOf:String) ifTrue:[
self parseError:try position:pos to:pos2.
errorFlag := false. "ok, user wants it - so he'll get it"
receiver := UnaryNode receiver:receiver selector:sel fold:nil.
] ifFalse:[
receiver := try
].
receiver lineNumber:tokenLineNr.
parseForCode ifFalse:[self rememberSelectorUsed:sel].
self nextToken.
].
^ receiver
"Modified: 21.3.1996 / 16:09:11 / cg"
!
variable
"parse a variable; if undefined, notify error and correct if user wants to"
|v|
v := self variableOrError:tokenName.
(v == #Error) ifFalse:[^ v].
v := self correctVariable.
(v == #Error) ifFalse:[^ v].
parseForCode ifFalse:[
self rememberGlobalUsed:tokenName
] ifTrue:[
tokenName first isLowercase ifTrue:[
ImplicitSelfSends ifTrue:[
selfNode isNil ifTrue:[
selfNode := SelfNode value:selfValue
].
^ UnaryNode receiver:selfNode selector:('implicit_' , tokenName) asSymbol.
].
^ #Error
]
].
^ VariableNode type:#GlobalVariable name:tokenName asSymbol
"Modified: 19.12.1996 / 22:30:01 / cg"
!
variableOrError
"parse a variable; return a node-tree, nil or #Error"
^ self variableOrError:tokenName
!
variableOrError:varName
"parse a variable; return a node-tree, nil or #Error"
|var varIndex aClass searchBlock args vars
tokenSymbol space classVarIndex|
"is it a block-arg or block-var ?"
searchBlock := currentBlock.
[searchBlock notNil] whileTrue:[
vars := searchBlock variables.
vars notNil ifTrue:[
varIndex := vars findFirst:[:aBlockVar | aBlockVar name = varName].
varIndex ~~ 0 ifTrue:[
^ VariableNode type:#BlockVariable
name:varName
token:(vars at:varIndex)
index:varIndex
block:searchBlock
from:currentBlock
].
].
args := searchBlock arguments.
args notNil ifTrue:[
varIndex := args findFirst:[:aBlockArg | aBlockArg name = varName].
varIndex ~~ 0 ifTrue:[
^ VariableNode type:#BlockArg
name:varName
token:(args at:varIndex)
index:varIndex
block:searchBlock
from:currentBlock
].
].
searchBlock := searchBlock home
].
"is it a method-variable ?"
methodVars notNil ifTrue:[
varIndex := methodVarNames indexOf:varName.
varIndex ~~ 0 ifTrue:[
var := methodVars at:varIndex.
var used:true.
^ VariableNode type:#MethodVariable
name:varName
token:var
index:varIndex
]
].
"is it a method-argument ?"
methodArgs notNil ifTrue:[
varIndex := methodArgNames indexOf:varName.
varIndex ~~ 0 ifTrue:[
^ VariableNode type:#MethodArg
name:varName
token:(methodArgs at:varIndex)
index:varIndex
]
].
contextToEvaluateIn notNil ifTrue:[
|con varNames|
"/
"/ search names of the context.
"/
con := contextToEvaluateIn.
[con notNil] whileTrue:[
varNames := self class argAndVarNamesForContext:con.
varIndex := varNames lastIndexOf:varName.
varIndex ~~ 0 ifTrue:[
^ VariableNode type:#ContextVariable
name:varName
context:con
index:varIndex
].
con := con home.
].
].
classToCompileFor notNil ifTrue:[
"is it an instance-variable ?"
varIndex := (self classesInstVarNames) lastIndexOf:varName.
varIndex ~~ 0 ifTrue:[
classToCompileFor isMeta ifTrue:[
classVarIndex := (self classesClassVarNames) lastIndexOf:varName.
classVarIndex ~~ 0 ifTrue:[
"/ give a warning - that maybe a common error
self warning:'there is both a class variable and a class-instance variable with that name.\\Refering to the class-instance variable here.' withCRs.
].
].
parseForCode ifFalse:[self rememberInstVarUsed:varName].
^ VariableNode type:#InstanceVariable
name:varName
index:varIndex
selfValue:selfValue
].
"/ see if there is a corresponding classVar (for the warning)
classVarIndex := (self classesClassVarNames) lastIndexOf:varName.
"/ "is it a class-instance-variable ?"
"/
"/ Notice:
"/ it is no longer allowed to fetch class-instance variables
"/ from instance methods ...
"/ (used to be in previous ST/X versions)
"/
varIndex := (self classesClassInstVarNames) lastIndexOf:varName.
varIndex ~~ 0 ifTrue:[
aClass := self inWhichClassIsClassInstVar:varName.
aClass notNil ifTrue:[
classToCompileFor isMeta ifFalse:[
classVarIndex == 0 ifTrue:[
"/ there is no corresponding classVar
self parseError:'access to class-inst-var from inst method is not allowed'.
^ #Error.
] ifFalse:[
"/ give a warning - that maybe a common error
self warning:'there is both a class variable and a class-instance variable with that name.\\Refering to the class variable here (instMethods dont see classInstVars).' withCRs.
]
].
"/ OLD CODE:
"/ self warning:'access to class-inst-var from inst method will soon be no longer supported'.
"/
"/ parseForCode ifFalse:[self rememberClassVarUsed:varName].
"/ ^ VariableNode type:#ClassInstanceVariable
"/ name:varName
"/ index:varIndex
"/ selfClass:aClass
"/ ].
]
].
"is it a class-variable ?"
varIndex := classVarIndex.
varIndex ~~ 0 ifTrue:[
aClass := self inWhichClassIsClassVar:varName.
aClass notNil ifTrue:[
parseForCode ifFalse:[self rememberClassVarUsed:varName].
^ VariableNode type:#ClassVariable class:aClass name:varName
]
].
"is it a private-class ?"
aClass := classToCompileFor.
aClass isMeta ifTrue:[
aClass := aClass soleInstance.
].
(aClass privateClassesAt:varName) notNil ifTrue:[
parseForCode ifFalse:[self rememberGlobalUsed:(aClass name , '::' , varName)].
^ VariableNode type:#PrivateClass class:aClass name:varName
].
].
"is it in a namespace ?"
space := self findNameSpaceWith:varName.
space notNil ifTrue:[
space ~~ Smalltalk ifTrue:[
parseForCode ifFalse:[self rememberGlobalUsed:(space name , '::' , varName)].
^ VariableNode type:#PrivateClass class:space name:varName
] ifFalse:[
parseForCode ifFalse:[self rememberGlobalUsed:varName].
^ VariableNode type:#GlobalVariable name:varName asSymbol
]
].
"is it a global-variable ?"
tokenSymbol := varName asSymbolIfInterned.
tokenSymbol notNil ifTrue:[
(Smalltalk includesKey:tokenSymbol) ifTrue:[
parseForCode ifFalse:[self rememberGlobalUsed:varName].
^ VariableNode type:#GlobalVariable name:tokenSymbol
]
].
^ #Error
"Modified: / 17.1.1998 / 03:56:35 / cg"
! !
!Parser methodsFor:'private'!
currentNameSpace
|spc|
spc := currentNamespace.
spc isNil ifTrue:[
(requestor respondsTo:#currentNameSpace) ifTrue:[
spc := requestor currentNameSpace
] ifFalse:[
spc := Class nameSpaceQuerySignal raise.
].
currentNamespace := spc.
].
^ spc
"Created: 19.12.1996 / 23:47:58 / cg"
"Modified: 14.10.1997 / 20:56:06 / cg"
!
currentNameSpace:aNameSpace
currentNamespace := aNameSpace.
"Created: 8.2.1997 / 19:37:03 / cg"
!
currentUsedNameSpaces
|spaces|
spaces := currentUsedNamespaces.
spaces isNil ifTrue:[
(requestor respondsTo:#usedNameSpaces) ifTrue:[
spaces := requestor usedNameSpaces
] ifFalse:[
spaces := Class usedNameSpaceQuerySignal raise.
].
currentUsedNamespaces := spaces.
].
^ spaces
"Created: 19.12.1996 / 23:49:10 / cg"
!
findNameSpaceWith:aVariableName
|topNameSpace ns currentSpace usedSpaces|
"/ private names have already been searched for.
classToCompileFor notNil ifTrue:[
"/ Q:
"/ consider private classes of superclasses.
"/ or search in the top owing classes namespace only ?
"/ for now, ignore other private classes - they are only
"/ known to the corresponding ownerClass.
"is it in the classes namespace ?"
classToCompileFor isPrivate ifTrue:[
ns := classToCompileFor topOwningClass nameSpace
] ifFalse:[
ns := classToCompileFor nameSpace.
].
(ns notNil
and:[ns ~~ Smalltalk]) ifTrue:[
(ns privateClassesAt:aVariableName) notNil ifTrue:[
^ ns
]
].
"/ ns := classToCompileFor nameSpace.
"/ ns notNil ifTrue:[
"/ "is it in the current classes namespace ?"
"/ (ns at:aVariableName asSymbol) notNil ifTrue:[
"/ ^ ns
"/ ]
"/ ].
].
"is it in the current namespace ?"
currentSpace := self currentNameSpace.
(currentSpace notNil
and:[currentSpace ~~ Smalltalk]) ifTrue:[
(currentSpace privateClassesAt:aVariableName) notNil ifTrue:[
^ currentSpace
]
].
"is it in one of the used namespaces ?"
usedSpaces := self currentUsedNameSpaces.
usedSpaces notNil ifTrue:[
usedSpaces do:[:aNameSpace |
(aNameSpace privateClassesAt:aVariableName) notNil ifTrue:[
^ aNameSpace
]
]
].
^ nil
"Created: 19.12.1996 / 23:51:02 / cg"
"Modified: 14.10.1997 / 20:56:35 / cg"
! !
!Parser methodsFor:'queries'!
classesClassInstVarNames
"caching allInstVarNames for next compilation saves time ..."
PrevClassInstVarNames isNil ifTrue:[
PrevClassInstVarNames := classToCompileFor class allInstVarNames
].
^ PrevClassInstVarNames
"Created: 14.10.1996 / 18:03:35 / cg"
!
classesClassVarNames
"caching allClassVarNames for next compilation saves time ..."
|aClass|
PrevClassVarNames isNil ifTrue:[
aClass := classToCompileFor.
aClass isMeta ifTrue:[
aClass := aClass soleInstance.
aClass isNil ifTrue:[
aClass := classToCompileFor
]
].
PrevClassVarNames := aClass allClassVarNames
].
^ PrevClassVarNames
"Modified: 17.6.1996 / 17:15:53 / stefan"
"Modified: 21.6.1996 / 15:21:17 / cg"
"Created: 14.10.1996 / 18:02:41 / cg"
!
classesInstVarNames
"caching allInstVarNames for next compilation saves time ..."
(PrevInstVarNames isNil or:[PrevClass ~~ classToCompileFor]) ifTrue:[
PrevClass notNil ifTrue:[
PrevClass removeDependent:Parser
].
PrevClass := classToCompileFor.
PrevInstVarNames := classToCompileFor allInstVarNames.
PrevClassInstVarNames := nil.
PrevClassVarNames := nil.
PrevClass addDependent:Parser
].
^ PrevInstVarNames
"Created: 14.10.1996 / 18:00:26 / cg"
!
hasNonOptionalPrimitiveCode
"return true if there was any ST/X style primitive code (valid after parsing)"
^ hasNonOptionalPrimitiveCode
!
hasPrimitiveCode
"return true if there was any ST/X style primitive code (valid after parsing)"
^ hasPrimitiveCode
!
lineNumberInfo
^ lineNumberInfo
"Created: 21.10.1996 / 17:06:16 / cg"
!
lineNumberInfo:how
lineNumberInfo := how
"Created: 23.10.1996 / 15:39:43 / cg"
!
methodArgs
"return an array with methodarg names (valid after parsing spec)"
^ methodArgNames
!
methodVars
"return a collection with method variablenames (valid after parsing)"
^ methodVarNames
!
modifiedClassVars
"return a collection with classvariablenames modified by method (valid after parsing)"
^ modifiedClassVars ? #()
"Modified: 19.6.1997 / 17:54:48 / cg"
!
modifiedGlobals
"return a collection with globalnames modified by method (valid after parsing)"
^ modifiedGlobals ? #()
"Modified: 19.6.1997 / 17:54:51 / cg"
!
modifiedInstVars
"return a collection with instvariablenames modified by method (valid after parsing)"
^ modifiedInstVars ? #()
"Modified: 19.6.1997 / 17:54:27 / cg"
!
numberOfMethodArgs
"return the number of methodargs (valid after parsing spec)"
^ methodArgs size
!
numberOfMethodVars
"return the number of method variables (valid after parsing)"
^ methodVars size
!
selector
"return the selector (valid after parsing spec)"
^ selector
!
usedClassVars
"return a collection with classvariablenames refd by method (valid after parsing)"
^ usedClassVars ? #()
"Modified: 19.6.1997 / 17:54:56 / cg"
!
usedGlobals
"return a collection with globalnames refd by method (valid after parsing)"
^ usedGlobals ? #()
"Modified: 19.6.1997 / 17:55:00 / cg"
!
usedInstVars
"return a collection with instvariablenames refd by method (valid after parsing)"
^ usedInstVars ? #()
"Modified: 19.6.1997 / 17:54:38 / cg"
!
usedVars
"return a collection with variablenames refd by method (valid after parsing)"
^ usedVars ? #()
"Modified: 19.6.1997 / 17:55:04 / cg"
!
usesSuper
"return true if the parsed method uses super (valid after parsing)"
^ usesSuper
! !
!Parser methodsFor:'setup'!
foldConstants:aSymbolOrNil
"change the constant folding level. See the classMethod for a description."
foldConstants := aSymbolOrNil
"Created: 21.3.1996 / 16:03:22 / cg"
"Modified: 21.3.1996 / 16:05:04 / cg"
!
initialize
super initialize.
hasPrimitiveCode := hasNonOptionalPrimitiveCode := false.
warnSTXHereExtensionUsed := WarnSTXSpecials.
usesSuper := false.
parseForCode := false.
foldConstants := FoldConstants.
lineNumberInfo := LineNumberInfo.
warnUndeclared := true.
"Modified: 7.9.1997 / 02:04:34 / cg"
!
parseForCode
"turns off certain statistics (keeping referenced variables, modified vars etc.)
Use this when parsing for compilation or evaluation"
parseForCode := true
!
setClassToCompileFor:aClass
"set the class to be used for parsing/evaluating"
classToCompileFor := aClass.
(classToCompileFor ~~ PrevClass) ifTrue:[
PrevClass notNil ifTrue:[
Parser update:PrevClass
]
]
!
setContext:aContext
"set the context used while evaluating"
contextToEvaluateIn := aContext
!
setSelf:anObject
"set the value to be used for self while evaluating"
selfValue := anObject.
classToCompileFor := anObject class.
(classToCompileFor ~~ PrevClass) ifTrue:[
PrevClass notNil ifTrue:[
Parser update:PrevClass
]
]
!
warnUndeclared:aBoolean
warnUndeclared := aBoolean.
"Created: 7.9.1997 / 02:05:00 / cg"
! !
!Parser methodsFor:'statistic'!
rememberClassVarUsed:name
usedClassVars isNil ifTrue:[
usedClassVars := Set new
].
usedClassVars add:name.
self rememberVariableUsed:name
!
rememberGlobalUsed:name
usedGlobals isNil ifTrue:[
usedGlobals := Set new
].
usedGlobals add:name.
self rememberVariableUsed:name
!
rememberInstVarUsed:name
usedInstVars isNil ifTrue:[
usedInstVars := Set new
].
usedInstVars add:name.
self rememberVariableUsed:name
!
rememberSelectorUsed:sel
usedMessages isNil ifTrue:[
usedMessages := IdentitySet new.
].
usedMessages add:sel
!
rememberVariableUsed:name
usedVars isNil ifTrue:[
usedVars := Set new
].
usedVars add:name
! !
!Parser class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libcomp/Parser.st,v 1.155 1998-02-16 14:03:50 cg Exp $'
! !
Parser initialize!