"

 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.

"

"{ Package: 'stx:libbasic' }"

Object subclass:#MiniInspector

	instanceVariableNames:'inspectedObject'

	classVariableNames:''

	poolDictionaries:''

	category:'System-Debugging-Support'

!

!MiniInspector 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

"

    a primitive (non graphical) inspector for use on systems without

    graphics or when the real inspector dies.

    [author:]

        Claus Gittinger

"

! !

!MiniInspector class methodsFor:'instance creation'!

openOn:anObject

    |anInspector|

    anInspector := (self new) initializeFor:anObject.

! !

!MiniInspector methodsFor:'private'!

commandLoop

    |cmd valid|

    'MiniInspector on ' print.  inspectedObject displayString printCR.

    '' printCR.

    [true] whileTrue:[

        valid := false.

        cmd := self getCommand:'inspector> '.

        cmd isNil ifTrue:[   "/ EOF -> quit

            cmd := $q

        ].

	cmd isNumber ifTrue:[

	    valid := true.

	    self inspectInstvar:cmd of:inspectedObject

	].

        (cmd == $i) ifTrue:[

            valid := true.

            self printInstVarsOf:inspectedObject

        ].

        (cmd == $p) ifTrue:[

            valid := true.

            inspectedObject displayString printCR

        ].

        (cmd == $c) ifTrue:[

            valid := true.

            inspectedObject class displayString printCR

        ].

        (cmd == $C) ifTrue:[

            valid := true.

            MiniInspector openOn:inspectedObject class.

	    'back in previous inspector; inspecting ' print.  inspectedObject displayString printCR.

        ].

	(cmd == $d) ifTrue:[

	    valid := true.

	    ObjectMemory dumpObject:inspectedObject

	].

	(cmd == $*) ifTrue:[

	    valid := true.

	    inspectedObject becomeNil.

	    ^ cmd. 

	].

	(cmd == $I) ifTrue:[

	    valid := true.

            self interpreterLoopWith:inspectedObject

	].

        (cmd == $q) ifTrue:[

	    ^ cmd. 

	].

        valid ifFalse: [

            'valid commands:

 p     .... print inspected object

 c     .... print inspected objects class

 i     .... print instvars

 d     .... VM-dump inspected object

 I     .... interpreter

 C     .... inspect class

 <Num> .... inspect instvar num (1..)

 *     .... becomeNil and quit (dangerous)

 q     .... quit

'       errorPrintCR

        ]

    ].

    "Modified: 24.7.1997 / 10:00:24 / cg"

!

enter

    AbortSignal handle:[:ex |

        '** Abort Signal cought - back in previous debugLevel' printCR.

        ex restart

    ] do:[

        Error handle:[:ex |

            |yesNo|

            'Error while executing command: ' print.

            ex description printCR.

            yesNo := self getCommand:'- (i)gnore / (p)roceed / (d)ebug ? '.

            yesNo == $d ifTrue:[

                ex reject

            ].

            yesNo == $p ifTrue:[

                ex proceed

            ].

            ex restart

        ] do:[

            self commandLoop.

        ].

    ].                                                                                                                  

    ^ nil

!

getCommand:prompt

    |cmd c num|

    prompt print.

    cmd := Character fromUser.

    c := cmd.

    (c notNil and:[c isDigit]) ifTrue:[

        num := 0.

        [c notNil and:[c isDigit]] whileTrue:[

            num := (num * 10) + c digitValue.

            c := Character fromUser.

        ].

        ^ num "/ numeric

    ].

    [c notNil and:[c isEndOfLineCharacter]] whileFalse:[

        c := Character fromUser

    ].

    ^ cmd

!

initializeFor:anObject

    inspectedObject := anObject.

    ^self

!

inspectInstvar:which of:anObject

    |numInsts idx|

    numInsts := anObject class instSize.

    which > numInsts ifTrue:[

	idx := which - numInsts.

        idx > anObject basicSize ifTrue:[

            'invalid indexed instvar index: ' print. idx printCR

        ] ifFalse:[

	    'Inspecting indexed instVar ' print. idx print. '...' printCR.

	    MiniInspector openOn:(anObject basicAt:idx).

	    'back in previous inspector; inspecting ' print.  inspectedObject displayString printCR.

        ]

    ] ifFalse: [

	which < 0 ifTrue:[

	    'invalid instVar # (must be >= 1)' printCR

	] ifFalse:[

	    'Inspecting instVar ' print. which print. '...' printCR.

	    MiniInspector openOn:(anObject instVarAt:which).

	    'back in previous inspector; inspecting ' print.  inspectedObject displayString printCR.

	].

    ]

    "Modified: 20.5.1996 / 10:27:40 / cg"

!

interpreterLoopWith:anObject

    |line done rslt|

    'read-eval-print loop; exit with empty line' printCR.

    '' printCR.

    done := false.

    [done] whileFalse:[

        '> ' print.

        line := Stdin nextLine.

        (line size == 0) ifTrue:[

            done := true

        ] ifFalse:[

            rslt := Compiler

                evaluate:line

                in:nil

                receiver:anObject

                notifying:nil

                ifFail:[].

            rslt printCR.

        ]

    ]

!

printInstVarsOf:anObject

    |n "{ Class: SmallInteger }" names |

    n := anObject class instSize.

    names := anObject class allInstVarNames.

    'number of instvars: ' print. n printCR.

    1 to:n do:[:i |

        (i printStringLeftPaddedTo:2) print. 

	' {' print. (names at:i) print. '}' print.

	': ' print.

        ((anObject instVarAt:i) displayString contractAtEndTo:80) printCR

    ].

    n := anObject basicSize.

    n > 0 ifTrue:[

        'number of indexed instvars: ' print. n printCR.

        n > 10 ifTrue:[n := 10].

        1 to:n do:[:i |

            ' [' print. i print. ']: ' print.

            ((anObject basicAt:i) displayString contractAtEndTo:80) printCR

	]

    ].

    "Modified: 20.5.1996 / 10:27:45 / cg"

! !

!MiniInspector class methodsFor:'documentation'!

version

! !