"{ Package: 'squeak:petitparser' }"

PPAbstractParseTest subclass:#PPScriptingTest

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	category:'PetitTests-Tests'

!

PPScriptingTest comment:'These are some simple demo-scripts of parser combinators for the compiler construction course.

http://www.iam.unibe.ch/~scg/Teaching/CC/index.html'

!

!PPScriptingTest methodsFor:'examples'!

expressionInterpreter

        "Same as #expressionInterpreter but with semantic actions."

        | mul prim add dec |

        add := PPUnresolvedParser new.

        mul := PPUnresolvedParser new.

        prim := PPUnresolvedParser new.

        dec := ($0 ppMinus: $9) ==> [ :token | token codePoint - $0 codePoint ].

        add def: ((mul , $+ asParser , add) ==> [ :nodes | (nodes at: 1) + (nodes at: 3) ])

                / mul.

        mul def: ((prim , $* asParser , mul) ==> [ :nodes | (nodes at: 1) * (nodes at: 3) ])

                / prim.

        prim def: (($( asParser , add , $) asParser) ==> [ :nodes | nodes at: 2 ])

                / dec.

        ^ add end

    "Modified: / 19-12-2010 / 18:13:51 / Jan Kurs <kurs.jan@post.cz>"

!

expressionParser

        "Simple demo of scripting an expression parser."

        | mul prim add dec |

        add := PPUnresolvedParser new.

        mul := PPUnresolvedParser new.

        prim := PPUnresolvedParser new.

        dec := ($0 ppMinus: $9).

        add def: (mul , $+ asParser , add)

                / mul.

        mul def: (prim , $* asParser , mul)

                / prim.

        prim def: ($( asParser , add , $) asParser)

                / dec.

        ^ add end

    "Modified: / 19-12-2010 / 18:14:18 / Jan Kurs <kurs.jan@post.cz>"

!

straightLineParser

        | goal stm stmList id char dec exp expList mulExp primExp nonzero num lower upper |

        goal := PPUnresolvedParser new.

        stmList := PPUnresolvedParser new.

        stm := PPUnresolvedParser new.

        exp := PPUnresolvedParser new.

        expList := PPUnresolvedParser new.

        mulExp := PPUnresolvedParser new.

        primExp := PPUnresolvedParser new.

        lower := $a ppMinus: $z.

        upper := $A ppMinus: $Z.

        char := lower / upper.

        nonzero := $1 ppMinus: $9.

        dec := $0 ppMinus: $9.

        id := char, ( char / dec ) star.

        num := $0 asParser / ( nonzero, dec star).

        goal def: stmList end.

        stmList def: stm , ( $; asParser, stm ) star.

        stm def: ( id, ':=' asParser, exp )

                / ( 'print' asParser, $( asParser, expList, $) asParser ). 

        exp def: mulExp, ( ( $+ asParser / $- asParser ), mulExp ) star.

        expList def: exp, ( $, asParser, exp ) star.

        mulExp def: primExp, ( ( $* asParser / $/ asParser ), primExp ) star.

        primExp def: id

                / num

                / ( $( asParser, stmList, $, asParser, exp, $) asParser ).

        ^ goal

    "Modified: / 19-12-2010 / 18:15:14 / Jan Kurs <kurs.jan@post.cz>"

! !

!PPScriptingTest methodsFor:'tests'!

testExpressionInterpreter

	self 

		assert: self expressionInterpreter

		parse: '2*(3+4)'

		to: 14

!

testExpressionParser

	self

		assert: self expressionParser

		parse: '2*(3+4)'

		to: #($2 $* ($( ($3 $+ $4) $)))

!

testSLassign

	self assert: self straightLineParser

		parse: 'abc:=1'

		to: #(#($a #($b $c) ':=' #(#(#($1 #()) #()) #())) #())

!

testSLprint

	self 

		assert: self straightLineParser

		parse: 'print(3,4)'

		to: #(('print' $( ((($3 ()) ()) () (($, ((($4 ()) ()) ())))) $)) ())

! !

!PPScriptingTest class methodsFor:'documentation'!

version_SVN

    ^ '$Id: PPScriptingTest.st,v 1.1 2011-08-18 18:56:17 cg Exp $'

! !