How to split ANTLR4 parser grammar into separate files when there are cyclic references?
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 '18 at 10:29
trollingchar
1887
add a comment |
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 '18 at 10:29
trollingchar
1887
add a comment |
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 '18 at 10:29
trollingchar
1887
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 '18 at 10:29
trollingchar
1887
asked Nov 17 '18 at 10:29
trollingchar
1887
asked Nov 17 '18 at 10:29
trollingchar
1887
asked Nov 17 '18 at 10:29
trollingchar
1887
asked Nov 17 '18 at 10:29
trollingchar
1887
1887
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53350339%2fhow-to-split-antlr4-parser-grammar-into-separate-files-when-there-are-cyclic-ref%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53350339%2fhow-to-split-antlr4-parser-grammar-into-separate-files-when-there-are-cyclic-ref%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
