[antlr-interest] Problem with splitting grammars

[Mu Qiao]

On Tue, Jul 5, 2011 at 12:04 AM, Jim Idle <jimi at temporal-wave.com> wrote:
> You have it the wrong way around - if your grammar has not changed, then
> your build process should not generate it.

Yes, I split the grammar and used import x.g, y.g. The problem is if I
change one of any grammar, all of the grammars will be regenerated. Is
there anyway to just generate for what I have changed?

>
> You might also try 3.4-beta4.

Will try it and let you know the result.

>
> Jim
>
>> -----Original Message-----
>> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
>> bounces at antlr.org] On Behalf Of Mu Qiao
>> Sent: Monday, July 04, 2011 2:18 AM
>> To: antlr-interest Interest
>> Subject: [antlr-interest] Problem with splitting grammars
>>
>> I have one big grammar that needs to be split to reduce compile time(C
>> source). For ANTLR 3.1.3 there are two problems:
>> 1. The generated source code may change every time I run ANTLR even if
>> I don't change the grammar http://paste.pocoo.org/show/428505/ shows
>> the difference.
>>
>> 2. The comment probably shouldn't tell about the date I use sed to
>> remove the comment but I don't think it's a good idea.
>> ANTLR shouldn't generate different source code if I don't change the
>> grammar. The date information should belong to the property of the
>> generated files, not the content of these files.
>>
>> Then I tried ANTLR 3.3 and I got the following error when generating
>> the source code:
>> error(10):  internal error: bashast/libbashWalker.g :
>> java.lang.NullPointerException
>> org.antlr.codegen.Target.getTokenTypeAsTargetLabel(Target.java:145)
>> org.antlr.codegen.CodeGenerator.getTokenTypeAsTargetLabel(CodeGenerator
>> .java:858)
>> org.antlr.codegen.ACyclicDFACodeGenerator.walkFixedDFAGeneratingStateMa
>> chine(ACyclicDFACodeGenerator.java:119)
>> org.antlr.codegen.ACyclicDFACodeGenerator.genFixedLookaheadDecision(ACy
>> clicDFACodeGenerator.java:47)
>> org.antlr.codegen.CodeGenerator.genLookaheadDecision(CodeGenerator.java
>> :646)
>> org.antlr.grammar.v2.CodeGenTreeWalker.block(CodeGenTreeWalker.java:101
>> 8)
>> org.antlr.grammar.v2.CodeGenTreeWalker.ebnf(CodeGenTreeWalker.java:1871
>> )
>> org.antlr.grammar.v2.CodeGenTreeWalker.element(CodeGenTreeWalker.java:1
>> 704)
>> org.antlr.grammar.v2.CodeGenTreeWalker.tree(CodeGenTreeWalker.java:2277
>> )
>> org.antlr.grammar.v2.CodeGenTreeWalker.element(CodeGenTreeWalker.java:1
>> 633)
>> org.antlr.grammar.v2.CodeGenTreeWalker.alternative(CodeGenTreeWalker.ja
>> va:1306)
>> org.antlr.grammar.v2.CodeGenTreeWalker.block(CodeGenTreeWalker.java:108
>> 1)
>> org.antlr.grammar.v2.CodeGenTreeWalker.rule(CodeGenTreeWalker.java:797)
>> org.antlr.grammar.v2.CodeGenTreeWalker.rules(CodeGenTreeWalker.java:588
>> )
>> org.antlr.grammar.v2.CodeGenTreeWalker.grammarSpec(CodeGenTreeWalker.ja
>> va:530)
>> org.antlr.grammar.v2.CodeGenTreeWalker.grammar(CodeGenTreeWalker.java:3
>> 36)
>> org.antlr.codegen.CodeGenerator.genRecognizer(CodeGenerator.java:430)
>> org.antlr.Tool.generateRecognizer(Tool.java:642)
>> org.antlr.Tool.process(Tool.java:455)
>> org.antlr.Tool.main(Tool.java:89)
>>
>> Here are my grammars:
>> https://github.com/qiaomuf/libbash/blob/42193d91c43d12bcc3113336e5e73e7
>> 4ca679c82/bashast/libbashWalker.g
>> https://github.com/qiaomuf/libbash/blob/42193d91c43d12bcc3113336e5e73e7
>> 4ca679c82/bashast/libbashPattern.g
>>
>> --
>> Best wishes,
>> Mu Qiao
>> GnuPG fingerprint: 92B1 B0C4 8D14 F8C4 EFA5  3ACC 30B3 0DE4 17B1 57E9
>>
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-- 
Best wishes,
Mu Qiao
GnuPG fingerprint: 92B1 B0C4 8D14 F8C4 EFA5  3ACC 30B3 0DE4 17B1 57E9