I have 4 grammar file: lexer L.g, parser P.g and two grammars G1 and G2 (see
below). After running antlr to generate Java files compilation fails:
[mkdir] Created dir: target\classes
[javac] Compiling 10 source files to target\classes
[javac] target\src\example\G1Lexer.java:18: cannot find symbol
[javac] symbol : class G1_L
[javac] location: class G1Lexer
[javac] public G1_L gL;
[javac] ^
[javac] target\src\example\G1Lexer.java:9: duplicate class: G1Lexer
[javac] public class G1Lexer extends Lexer {
[javac] ^
[javac] target\src\example\G1_L.java:22: cannot access example.G1Lexer
[javac] bad class file: target\src\example\G1Lexer.java
[javac] file does not contain class example.G1Lexer
[javac] Please remove or make sure it appears in the correct
subdirectory of the classpath.
[javac] public G1Lexer gG1;
[javac] ^
[javac] 3 errors
The workaround would be to move @lexer::header file to both G1.g and G2.g.
It works but the solution has 2 drawbacks:
1. Code duplication.
2. L.java can not be compiled as standalone file anymore because it lacks
package declaration.
==========================L.g================================
lexer grammar L;
@lexer::header {
package example;
}
IDENT : 'A-Z' +
;
==========================P.g==========================
parser grammar P ;
tokens {
BEGIN = 'begin';
END = 'end';
}
method: BEGIN IDENT END;
============================ G1.g ======================
grammar G1 ;
import L,P;
tokens {
PROGRAM = 'program';
}
@header {
package example;
}
program: PROGRAM method;
===========================G2.g=====================
grammar G2 ;
import L,P;
tokens {
FUNCTION = 'function';
}
@header {
package example;
}
function: FUNCTION method;
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