1 "{ Package: 'stx:goodies/petitparser/compiler' }"

     2 

     3 PPCDelegateNode subclass:#PPCOptionalNode

     4 	instanceVariableNames:''

     5 	classVariableNames:''

     6 	poolDictionaries:''

     7 	category:'PetitCompiler-Nodes'

     8 !

     9 

    10 PPCOptionalNode comment:''

    11 !

    12 

    13 !PPCOptionalNode methodsFor:'as yet unclassified'!

    14 

    15 acceptsEpsilon

    16 	^ true

    17 !

    18 

    19 acceptsEpsilonOpenSet: set

    20 	^ true

    21 !

    22 

    23 compileWith: compiler effect: effect id: id

    24 	compiler startMethod: id.

    25 	compiler addVariable: 'retval'.

    26 

    27 	compiler add: 'retval := '.

    28 	compiler callOnLine: (child compileWith: compiler ).

    29 	compiler add: '^ error ifFalse: [ retval ] ifTrue: [ self clearError. nil ]'.

    30  ^ compiler stopMethod.

    31 !

    32 

    33 prefix

    34 	^ #opt

    35 ! !

    36