rule named same as parser rule attributies will generate a wrong parser file
- Dominant language
- Java
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- 19k
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Description
When a grammar's action use a parser rule attribute, and have a rule have a same name. like bellow
The generate parser code can not compile. because ANTLR tool add a redundant LabelRef after PropertiesRef。
grammar file :
`
grammar A;
IO: 'a'..'z'+;
decl: text ID ';'
{System.out.println($text + $start);}
;
text: 'int' | 'float' ;
start: 'start';
`
the generated action part:
` System.out.println(_input.getText(_localctx.start, _input.LT(-1))((DeclContext)_localctx).text + _localctx.start((DeclContext)_localctx).start);
`
Contributor guide
Research direction
Start by reproducing the issue with the grammar A example and inspect the generated action containing PropertiesRef and the redundant LabelRef. Trace how the parser generator resolves the rule named text and the parser rule attribute start. Done means the generated parser compiles and emits correct references for both.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100