.
"
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 primitiveNr primitiveResource
logged
warnedUndefVars warnSTXHereExtensionUsed
correctedSource'
classVariableNames:'PrevClass PrevInstVarNames
PrevClassVarNames PrevClassInstVarNames
LazyCompilation ArraysAreImmutable
ImplicitSelfSends'
poolDictionaries:''
category:'System-Compiler'
!
Parser comment:'
COPYRIGHT (c) 1989 by Claus Gittinger
All Rights Reserved
$Header: /cvs/stx/stx/libcomp/Parser.st,v 1.46 1995-07-23 02:23:59 claus Exp $
'!
!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.
"
!
version
"
$Header: /cvs/stx/stx/libcomp/Parser.st,v 1.46 1995-07-23 02:23:59 claus Exp $
"
!
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 interrest 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.
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
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.
"
! !
!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 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 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
!
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:nil
receiver:anObject
notifying:requestor
logged:false
ifFail:nil
compile:true
!
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 m|
aStringOrStream isNil ifTrue:[^ nil].
aStringOrStream isStream ifTrue:[
parser := self for:aStringOrStream.
mustBackup := true
] ifFalse:[
loggedString := aStringOrStream.
parser := self for:(ReadStream on:aStringOrStream).
mustBackup := false
].
parser parseForCode.
parser setSelf:anObject.
parser setContext:aContext.
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 notNil ifTrue:[
(logged
and:[loggedString notNil
and:[Smalltalk logDoits]]) ifTrue:[
chgStream := Class changesStream.
chgStream notNil ifTrue:[
chgStream nextChunkPut:loggedString.
chgStream cr.
chgStream close
].
].
"
if compile is false, or the parse tree is that of a constant,
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.
"
(compile not
or:[tree isConstant
or:[aStringOrStream isStream]]) ifTrue:[
^ tree evaluate
] ifFalse:[
"
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 (neede for example, 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
].
sReal := 'doIt ^[\' withCRs , s , '\] value' withCRs.
m := self
compile:sReal
forClass:anObject class
inCategory:'_temporary_'
notifying:requestor
install:false
skipIfSame:false
silent:true.
m notNil ifTrue:[
m ~~ #Error ifTrue:[
"
fake: patch the source string, to what the user expects
in the browser
"
m source:' \' withCRs , s .
value := m valueWithReceiver:anObject
arguments:#()
selector:#doIt
search:nil
sender:nil.
] ifFalse:[
parser evalExitBlock:[:value | parser release. ^ value].
value := tree evaluate.
parser evalExitBlock:nil.
]
].
]
]
].
parser release.
^ value
! !
!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
! !
!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:'parsing'!
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 ifTrue:[
tree expression isMessage ifTrue:[
tree := tree expression
]
].
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'
"
!
parseExpression:aString
"parse aString as an expression;
Return the parseTree (if ok), nil (for an empty string
or comment only) or #Error (syntactic error)."
^ self withSelf:nil
parseExpression:aString
notifying:nil
ignoreErrors:true "silence on Transcript"
ignoreWarnings:true
!
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
!
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
!
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."
|parser tree token|
aString isNil ifTrue:[^ nil].
parser := self for:(ReadStream on:aString).
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
!
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
!
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."
^ 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.
"
!
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"
|parser|
aString isNil ifTrue:[^ nil].
parser := self for:(ReadStream on:aString) in:aClass.
parser nextToken.
(parser parseMethodSpec == #Error) ifTrue:[^ nil].
(parser parseMethodBodyVarSpec == #Error) ifTrue:[^ nil].
parser errorFlag ifTrue:[^ nil].
^ parser
!
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."
^ 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.
"
!
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."
^ self parseMethod:aString in:aClass warnings:true
!
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."
|parser tree|
aString isNil ifTrue:[^ nil].
parser := self for:(ReadStream on:aString) in:aClass.
warnBoolean ifFalse:[parser ignoreWarnings].
tree := parser parseMethod.
(parser errorFlag or:[tree == #Error]) ifTrue:[^ nil].
^ parser
! !
!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 class methodsFor:'controlling compilation'!
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
"
!
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
"
!
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
"
! !
!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
! !
!Parser class methodsFor:'changes'!
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
]
]
!
flushNameCache
"unconditional flush name caches"
PrevClass notNil ifTrue:[
PrevClass removeDependent:Parser
].
PrevClass := nil.
PrevInstVarNames := nil.
PrevClassVarNames := nil.
PrevClassInstVarNames := nil.
"Parser flushNameCache"
! !
!Parser methodsFor:'setup'!
initialize
super initialize.
hasPrimitiveCode := false.
warnSTXHereExtensionUsed := WarnSTXSpecials.
usesSuper := false.
parseForCode := false.
!
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
]
]
!
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
]
]
!
setContext:aContext
"set the context used while evaluating"
contextToEvaluateIn := aContext
! !
!Parser methodsFor:'queries'!
usesSuper
"return true if the parsed method uses super (valid after parsing)"
^ usesSuper
!
selector
"return the selector (valid after parsing spec)"
^ selector
!
numberOfMethodArgs
"return the number of methodargs (valid after parsing spec)"
^ methodArgs size
!
methodArgs
"return an array with methodarg names (valid after parsing spec)"
^ methodArgNames
!
numberOfMethodVars
"return the number of method variables (valid after parsing)"
^ methodVars size
!
methodVars
"return a collection with method variablenames (valid after parsing)"
^ methodVarNames
!
usedVars
"return a collection with variablenames refd by method (valid after parsing)"
^ usedVars
!
usedInstVars
"return a collection with instvariablenames refd by method (valid after parsing)"
^ usedInstVars
!
usedClassVars
"return a collection with classvariablenames refd by method (valid after parsing)"
^ usedClassVars
!
usedGlobals
"return a collection with globalnames refd by method (valid after parsing)"
^ usedGlobals
!
modifiedInstVars
"return a collection with instvariablenames modified by method (valid after parsing)"
^ modifiedInstVars
!
modifiedClassVars
"return a collection with classvariablenames modified by method (valid after parsing)"
^ modifiedClassVars
!
modifiedGlobals
"return a collection with globalnames modified by method (valid after parsing)"
^ modifiedGlobals
!
hasPrimitiveCode
"return true if there was any ST/X style primitive code (valid after parsing)"
^ hasPrimitiveCode
!
instVarNames
"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
!
classInstVarNames
"caching allInstVarNames for next compilation saves time ..."
PrevClassInstVarNames isNil ifTrue:[
PrevClassInstVarNames := classToCompileFor class allInstVarNames
].
^ PrevClassInstVarNames
!
classVarNames
"caching allClassVarNames for next compilation saves time ..."
|aClass className|
PrevClassVarNames isNil ifTrue:[
aClass := classToCompileFor.
classToCompileFor isMeta ifTrue:[
className := aClass name.
className := className copyWithoutLast:5.
aClass := Smalltalk at:(className asSymbol).
aClass isNil ifTrue:[
aClass := classToCompileFor
]
].
PrevClassVarNames := aClass allClassVarNames
].
^ PrevClassVarNames
! !
!Parser methodsFor:'accessing'!
tree
"return the parsetree"
^tree
!
tree:aTree
"private: set the tree - for internal use only"
tree := aTree
!
correctedSource
^ correctedSource
!
primitiveNumber
"return the ST-80 style primitiveNumber or nil (valid after parsing)"
^ primitiveNr
!
primitiveResource
"return the ST-80 style resource info or nil (valid after parsing)."
^ primitiveResource
!
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
!
release
methodArgs := methodVars := tree := selfNode := superNode := nil.
super release.
!
targetClass:aClass
classToCompileFor := aClass
! !
!Parser methodsFor:'error handling'!
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.
]
]
!
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
!
parseError:aMessage position:position
"report an error"
^ self parseError:aMessage position:position to:nil
!
parseError:aMessage
"report an error"
^ self parseError:aMessage position:tokenPosition to:nil
!
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
!
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|
"
alredy warned about this one ?
"
warnedUndefVars notNil ifTrue:[
(warnedUndefVars includes:aName) ifTrue:[
"already warned about this one"
^ 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 instVarNames) 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
!
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
!
exitWith:something
"this is the longjump out of evaluation via a return expression"
evalExitBlock value:something
! !
!Parser methodsFor:'parsing'!
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
!
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 == #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
].
(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
!
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|
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').
].
^#Error
]
].
^ stats
!
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 pos wmsg|
((tokenType == #BinaryOperator) and:[tokenName = '<']) ifTrue:[
"an ST-80 primitive - parsed but ignored"
pos := tokenPosition.
self nextToken.
primitiveNr := self parseST80Primitive.
(primitiveNr == #Error) ifTrue:[^ #Error].
primitiveNr < 0 ifTrue:[
wmsg := 'ST-80 directive ignored'.
primitiveNr := nil.
] ifFalse:[
wmsg := 'ST-80 primitive may not work'
].
self warning:wmsg position:pos
].
(self parseMethodBodyVarSpec == #Error) ifTrue:[^ #Error].
(tokenType ~~ #EOF) ifTrue:[
stats := self statementList
].
^ stats
!
parseMethodBodyVarSpec
"parse a methods local variable specification.
Leave spec of locals in methodLocals as a side effect.
Return #Error or nil.
methodBodyVarSpec ::= '|' { IDENTIFIER } '|'
| <empty>
"
|var pos msg|
(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 := Array with:var.
methodVarNames := Array with:tokenName
] ifFalse:[
(methodVarNames includes:tokenName) ifTrue:[
self parseError:'redefinition of ''' , tokenName , ''' in local variables'
position:tokenPosition to:tokenPosition + tokenName size -1.
] ifFalse:[
methodVars := methodVars copyWith:var.
methodVarNames := methodVarNames copyWith:tokenName
]
].
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
!
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|
(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
].
primNumber := tokenValue.
self nextToken.
] ifFalse:[
(tokenName = 'resource:') ifTrue:[
self nextToken.
(tokenType ~~ #Symbol) ifTrue:[
self parseError:'symbol expected'.
^ #Error
].
primNumber := -1.
primitiveResource := tokenValue.
primitiveResource == #keyboard ifTrue:[
self nextToken.
tokenType == $( ifTrue:[
self nextToken.
keys := OrderedCollection new.
[tokenType == $) ] whileFalse:[
keys add:tokenValue.
self nextToken.
].
primitiveResource := Array with:primitiveResource
with:keys.
self nextToken.
]
] ifFalse:[
self nextToken.
].
] ifFalse:[
self parseError:'unrecognized primitive'.
^ #Error
].
].
((tokenType == #BinaryOperator) and:[tokenName = '>']) ifFalse:[
self parseError:'bad primitive definition (> expected)'.
^ #Error
].
self nextToken.
^ primNumber
!
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|
thisStatement := self statement.
(thisStatement == #Error) ifTrue:[^ #Error].
firstStatement := thisStatement.
[tokenType == $.] whileTrue:[
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
!
statement
"parse a statement; return a node-tree or #Error.
statement ::= '^' expression
| PRIMITIVECODE
| expression
"
|expr node|
(tokenType == $^) ifTrue:[
self nextToken.
expr := self expression.
(expr == #Error) ifTrue:[^ #Error].
node := ReturnNode expression:expr.
node home:self blockHome:currentBlock.
^ node
].
(tokenType == #Primitive) ifTrue:[
self nextToken.
hasPrimitiveCode := true.
^ PrimitiveNode code:''
].
(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 ^ ?'
]
]
].
"
^ StatementNode expression:expr
!
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 (uspecified ?) 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
!
keywordExpression
"parse a keyword-expression; return a node-tree, nil or #Error.
keywordExpression ::= binaryexpression
| { KEYWORD-PART binaryExpression }
"
|receiver sel arg args pos1 pos2 try lno note|
receiver := self binaryExpression.
(receiver == #Error) ifTrue:[^ #Error].
(tokenType == #Keyword) ifTrue:[
pos1 := 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.
(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:false.
note := receiver plausibilityCheck.
note notNil ifTrue:[
self warning:note position:pos1 to:pos2
].
] ifFalse:[
receiver := try
].
receiver lineNumber:lno.
parseForCode ifFalse:[self rememberSelectorUsed:sel].
].
^ receiver
!
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
!
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) 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.
(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:false.
note := receiver plausibilityCheck.
note notNil ifTrue:[
self warning:note position:pos to:tokenPosition
].
] ifFalse:[
receiver := try
].
receiver lineNumber:lno.
parseForCode ifFalse:[self rememberSelectorUsed:sel].
].
^ receiver
!
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.
(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:false.
] ifFalse:[
receiver := try
].
receiver lineNumber:tokenLineNr.
parseForCode ifFalse:[self rememberSelectorUsed:sel].
self nextToken.
].
^ receiver
!
primary
"parse a primary-expression; return a node-tree, nil or #Error"
|val var expr pos name t cls|
pos := tokenPosition.
(tokenType == #Self) ifTrue:[
self nextToken.
(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.
"
self variableOrError == #Error ifTrue:[
tokenName = 'here' 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:[
var := self variable.
(var == #Error) ifTrue:[
errorFlag := true
].
self nextToken.
(tokenType == $_) ifFalse:[
^ var
].
(var ~~ #Error) ifTrue:[
t := var type.
(t == #MethodArg) ifTrue:[
self parseError:'assignment to method argument' position:pos to:tokenPosition.
errorFlag := true
] ifFalse:[
(t == #BlockArg) ifTrue:[
self parseError:'assignment to block argument' position:pos to:tokenPosition.
errorFlag := true
] ifFalse:[
(t == #InstanceVariable) ifTrue:[
name := PrevInstVarNames at:(var index).
parseForCode ifFalse:[
modifiedInstVars isNil ifTrue:[
modifiedInstVars := Set new
].
modifiedInstVars add:name
]
] ifFalse:[
(t == #ClassVariable) ifTrue:[
name := var name.
name := name copyFrom:((name indexOf:$:) + 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 contains class' position:pos to:tokenPosition.
]
].
parseForCode ifFalse:[
modifiedGlobals isNil ifTrue:[
modifiedGlobals := Set new
].
modifiedGlobals add:var name
]
]
]
]
]
]
].
self nextToken.
expr := self expression.
(errorFlag or:[expr == #Error]) ifTrue:[^ #Error].
^ AssignmentNode variable:var expression:expr
].
((tokenType == #Integer)
or:[(tokenType == #Character)
or:[(tokenType == #Float)
or:[(tokenType == #String)
or:[(tokenType == #Symbol)]]]]) ifTrue:[
val := ConstantNode type:tokenType value:tokenValue.
self nextToken.
(tokenType == $_) ifTrue:[
self parseError:'assignment to a constant' position:pos to:tokenPosition.
^ #Error
].
^ val
].
(tokenType == #Nil) ifTrue:[
self nextToken.
(tokenType == $_) ifTrue:[
self parseError:'assignment to nil' position:pos to:tokenPosition.
^ #Error
].
^ ConstantNode type:#Nil value:nil
].
(tokenType == #True) ifTrue:[
self nextToken.
(tokenType == $_) ifTrue:[
self parseError:'assignment to true' position:pos to:tokenPosition.
^ #Error
].
^ ConstantNode type:#True value:true
].
(tokenType == #False) ifTrue:[
self nextToken.
(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 == $_) 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 == $_) 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 == $_) ifTrue:[
self parseError:'assignment to thisContext' position:pos to:tokenPosition.
^ #Error
].
^ VariableNode type:#ThisContext
].
(tokenType == #HashLeftParen) ifTrue:[
self nextToken.
val := self array.
self nextToken.
(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 == $_) 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:[
self syntaxError:'missing '')'' (i.e. ''' , tokenType asString , ''' unexpected)' withCRs position:pos to:tokenPosition.
] ifFalse:[
self syntaxError:'missing '')''' position:pos to:tokenPosition.
].
^ #Error
].
self nextToken.
(tokenType == $_) ifTrue:[
self parseError:'invalid assignment' position:pos to:tokenPosition.
^ #Error
].
val parenthized:true.
^ val
].
(tokenType == $[ ) ifTrue:[
val := self block.
self nextToken.
(tokenType == $_) ifTrue:[
self parseError:'invalid assignment' position:pos to:tokenPosition.
^ #Error
].
^ val
].
(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:[
self syntaxError:('error in primary; '
, tokenType printString , '(' , tokenName , ') ' ,
' unexpected')
] ifFalse:[
self syntaxError:('error in primary; '
, tokenType printString ,
' unexpected')
]
].
^ #Error
!
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 instIndex aClass searchBlock args vars
tokenSymbol|
"is it a block-arg or block-var ?"
searchBlock := currentBlock.
[searchBlock notNil] whileTrue:[
vars := searchBlock variables.
vars notNil ifTrue:[
instIndex := vars findFirst:[:aBlockVar | aBlockVar name = varName].
instIndex ~~ 0 ifTrue:[
^ VariableNode type:#BlockVariable
name:varName
token:(vars at:instIndex)
index:instIndex
block:searchBlock
].
].
args := searchBlock arguments.
args notNil ifTrue:[
instIndex := args findFirst:[:aBlockArg | aBlockArg name = varName].
instIndex ~~ 0 ifTrue:[
^ VariableNode type:#BlockArg
name:varName
token:(args at:instIndex)
index:instIndex
block:searchBlock
].
].
searchBlock := searchBlock home
].
"is it a method-variable ?"
methodVars notNil ifTrue:[
instIndex := methodVarNames indexOf:varName.
instIndex ~~ 0 ifTrue:[
var := methodVars at:instIndex.
var used:true.
^ VariableNode type:#MethodVariable
name:varName
token:var
index:instIndex
]
].
"is it a method-argument ?"
methodArgs notNil ifTrue:[
instIndex := methodArgNames indexOf:varName.
instIndex ~~ 0 ifTrue:[
^ VariableNode type:#MethodArg
name:varName
token:(methodArgs at:instIndex)
index:instIndex
]
].
classToCompileFor notNil ifTrue:[
"is it an instance-variable ?"
instIndex := (self instVarNames) lastIndexOf:varName.
instIndex ~~ 0 ifTrue:[
parseForCode ifFalse:[self rememberInstVarUsed:varName].
^ VariableNode type:#InstanceVariable
name:varName
index:instIndex
selfValue:selfValue
].
"is it a class-instance-variable ?"
instIndex := (self classInstVarNames) lastIndexOf:varName.
instIndex ~~ 0 ifTrue:[
aClass := self inWhichClassIsClassInstVar:varName.
aClass notNil ifTrue:[
parseForCode ifFalse:[self rememberClassVarUsed:varName].
^ VariableNode type:#ClassInstanceVariable
name:varName
index:instIndex
selfClass:aClass
]
].
"is it a class-variable ?"
instIndex := (self classVarNames) lastIndexOf:varName.
instIndex ~~ 0 ifTrue:[
aClass := self inWhichClassIsClassVar:varName.
aClass notNil ifTrue:[
parseForCode ifFalse:[self rememberClassVarUsed:varName].
^ VariableNode type:#ClassVariable class:aClass name:varName
]
]
].
"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
!
variable
"parse a variable; if undefined, notify error and correct if user wants to"
|v|
v := self variableOrError.
(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.
]
]
].
^ VariableNode type:#GlobalVariable name:tokenName asSymbol
!
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.
className := className copyWithoutLast:5.
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
!
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
!
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
!
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.
node statements:stats.
currentBlock := node home.
(stats == #Error) ifTrue:[^ #Error].
^ node
!
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
!
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
!
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
!
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
].
(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
! !
!Parser methodsFor:'statistic'!
rememberSelectorUsed:sel
usedMessages isNil ifTrue:[
usedMessages := IdentitySet new.
].
usedMessages add:sel
!
rememberVariableUsed:name
usedVars isNil ifTrue:[
usedVars := Set new
].
usedVars add:name
!
rememberGlobalUsed:name
usedGlobals isNil ifTrue:[
usedGlobals := Set new
].
usedGlobals add:name.
self rememberVariableUsed:name
!
rememberClassVarUsed:name
usedClassVars isNil ifTrue:[
usedClassVars := Set new
].
usedClassVars add:name.
self rememberVariableUsed:name
!
rememberInstVarUsed:name
usedInstVars isNil ifTrue:[
usedInstVars := Set new
].
usedInstVars add:name.
self rememberVariableUsed:name
! !
!Parser methodsFor:'error correction'!
correctByDeleting
"correct (by deleting token) if user wants to;
return #Error if there was no correction;
nil if there was one."
(self confirm:'confirm deleting') ifFalse:[^ #Error].
"
tell requestor (i.e. CodeView) about the change
this will update what the requestor shows.
"
requestor deleteSelection.
"
get the updated source-string
which is needed, when we eventually install the new method
"
correctedSource := requestor currentSourceCode.
^ nil
!
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|
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:[
PrevInstVarNames do:[:instVarName |
names add:instVarName.
dists add:(aString spellAgainst: "levenshteinTo:"instVarName)
]
].
"class-variables"
classToCompileFor notNil ifTrue:[
PrevClassVarNames 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 notNil ifTrue:[
names add:'---- method arguments ----'.
methodArgNames asSortedCollection do:[:methodArgName |
names add:methodArgName.
]
].
names add:'---- instance variables ----'.
PrevInstVarNames asSortedCollection do:[:instVarName |
(names includes:instVarName) ifFalse:[
names add:instVarName.
]
]
].
^ names
].
^ nil
!
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|
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:[
^ #Error
] ifFalse:[
^ 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.
"redo parse with new value"
tokenName := newName.
^ self variableOrError
!
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
!
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'"
!
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.
^ newSelector
!
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|
"
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:[(self instVarNames notNil and:[self instVarNames includes:aSelectorString])
or:[(self classInstVarNames notNil and:[self classInstVarNames includes:aSelectorString])
or:[(self classVarNames notNil and:[self classVarNames includes:aSelectorString])]]]]) ifTrue:[
err := ' is currently nowhere implemented ..
.. but a variable with that name is defined.
Missing ''.'' after the previous expression ?'.
].
"
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:[
ok := receiver evaluate respondsTo:sym.
err := ' will not be understood here'.
] ifFalse:[
"
if the receiver is a global, we check it too ...
"
receiver type == #GlobalVariable 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.
err := ' may not be understood here'.
] 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:[
"OLD: "
self warning:('#' , aSelectorString , err) 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
! !