Splitting lexer and parser grammar into separate files causes error

[StuartReavley]

To repro:

• use grammars here: https://github.com/sepp2k/antlr4-string-interpolation-examples/tree/master/with-duplication

• run commands

  • java -jar ./antlr4-4.8-2-SNAPSHOT-complete.jar -Dlanguage=Rust StringLexer.g4
  • java -jar ./antlr4-4.8-2-SNAPSHOT-complete.jar -Dlanguage=Rust StringParser.g4

• Observe errors, e.g: error[E0412]: cannot find type `StringParserParserContextType` in this scope --> src/parsing/jasm/gen/stringparser.rs:532:49 | 156 | pub struct StringParserContextType; | ----------------------------------- similarly named struct `StringParserContextType` defined here ... 532 | fn RPAR(&self) -> Option<Rc<TerminalNode<'input,StringParserParserContextType>>> where Self:Sized{ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |

As I understand, there is no way to use lexer modes (e.g. in that example) without separate files. Any way to get this to work?

Thank you! Stuart

[rbuckland]

@StuartReavley - did you try adding both files to the command line ?

eg:

cd grammars && java -jar /home/rbuckland/.m2/repository/org/antlr/antlr4/4.8-2-SNAPSHOT/antlr4-4.8-2-SNAPSHOT-complete.jar -Dlanguage=Rust -o ../src/gen PhpParser.g4 PhpLexer.g4 

[mh182]

I hit the same problem with the generated code of a PL/SQL grammar even if I used the lexer and parser grammar together.

antlr4 -Dlanguage=Rust -o src -Xexact-output-dir grammars/PlSqlLexer.g4 grammars/PlSqlParser.g4

Compiling the generated code

        error[E0405]: cannot find trait `PlSqlParserParserContext` in this scope
              --> src/plsqlparser.rs:106025:14
               |
        4098   | / pub trait PlSqlParserContext<'input>:
        4099   | |     for<'x> Listenable<dyn PlSqlParserListener<'input> + 'x > + 
        4100   | |     ParserRuleContext<'input, TF=LocalTokenFactory<'input>, Ctx=PlSqlParserContextType>
        4101   | | {}
               | |__- similarly named trait `PlSqlParserContext` defined here
        ...
        106025 |   impl<'input> PlSqlParserParserContext<'input> for Table_ref_aux_internalContextAll<'input>{}
               |                ^^^^^^^^^^^^^^^^^^^^^^^^ help: a trait with a similar name exists: `PlSqlParserContext`

        Some errors have detailed explanations: E0405, E0424.
        For more information about an error, try `rustc --explain E0405`.

Renaming the generated trait to PLSqlParserContext fixed it

sed -i s/PlSqlParserParserContext/PlSqlParserContext/g src/plsqlparser.rs