How to split ANTLR4 parser grammar into separate files when there are cyclic references?
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I am trying to make a language which grammar has cyclic references in parsing rules, like this:
statement : 'return' expression ';' ;
expression : ID | lambda ;
lambda : 'func' '{' statement '}' ;
It works when everything is in a single file, but I want to place everything about expressions in file Expressions.g4, statements in Statements.g4, and so on. When I split this grammar and add import directives where needed, ANTLR complains about reference to undefined rule.
Of course, implicit tokens like ';' are replaced by explicit after separating lexer and parser grammars, they are here to make this example clear.
antlr4
asked Nov 17 at 10:29
trollingchar
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up vote
0
down vote
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I am trying to make a language which grammar has cyclic references in parsing rules, like this:
statement : 'return' expression ';' ;
expression : ID | lambda ;
lambda : 'func' '{' statement '}' ;
It works when everything is in a single file, but I want to place everything about expressions in file Expressions.g4, statements in Statements.g4, and so on. When I split this grammar and add import directives where needed, ANTLR complains about reference to undefined rule.
Of course, implicit tokens like ';' are replaced by explicit after separating lexer and parser grammars, they are here to make this example clear.
antlr4
asked Nov 17 at 10:29
trollingchar
1013
New contributor
trollingchar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am trying to make a language which grammar has cyclic references in parsing rules, like this:
statement : 'return' expression ';' ;
expression : ID | lambda ;
lambda : 'func' '{' statement '}' ;
It works when everything is in a single file, but I want to place everything about expressions in file Expressions.g4, statements in Statements.g4, and so on. When I split this grammar and add import directives where needed, ANTLR complains about reference to undefined rule.
Of course, implicit tokens like ';' are replaced by explicit after separating lexer and parser grammars, they are here to make this example clear.
antlr4
asked Nov 17 at 10:29
trollingchar
1013
New contributor
trollingchar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I am trying to make a language which grammar has cyclic references in parsing rules, like this:
statement : 'return' expression ';' ;
expression : ID | lambda ;
lambda : 'func' '{' statement '}' ;
It works when everything is in a single file, but I want to place everything about expressions in file Expressions.g4, statements in Statements.g4, and so on. When I split this grammar and add import directives where needed, ANTLR complains about reference to undefined rule.
Of course, implicit tokens like ';' are replaced by explicit after separating lexer and parser grammars, they are here to make this example clear.
antlr4
antlr4
asked Nov 17 at 10:29
trollingchar
1013
New contributor
trollingchar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Nov 17 at 10:29
trollingchar
1013
New contributor
trollingchar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Nov 17 at 10:29
trollingchar
1013
New contributor
trollingchar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Nov 17 at 10:29
trollingchar
1013
asked Nov 17 at 10:29
trollingchar
1013
1013
New contributor
trollingchar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
trollingchar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
trollingchar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
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trollingchar is a new contributor. Be nice, and check out our Code of Conduct.
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