"{ Package: 'stx:goodies/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 1.2 2012-01-13 11:22:50 cg Exp $'

! !