antlr4 generated javascript code results in error on "this._input.LT(1)" when run

[Clive]

Hi, I'm not sure if i'm doing something stupid since i'm a javascript n00b, but i can't seem to get the javascript generated output of antlr to work correctly. I've added a copy of my lexer and parser below. The code is so simple, i feel like i must be doing something wrong in the way i run it. I'm trying to simply invoke the rule on the parser - just to see if it will throw parse errors. Any help would be much appreciated - i've been banging my head against this for a while now.

I installed the javascript runtime from NPM - it says it installed v 4.5.2 (ant...@4.5.2 node_modules/antlr4)

I'm running on OS X, node v. 0.12.2 and npm v. 2.7.5 installed using brew. Using the antlr-4.5-complete.jar file to generate code.

When i run this script below, I get:

$ node runner.js

/Users/clive/node_modules/antlr4/Parser.js:433

this._ctx.start = this._input.LT(1);

                             ^

TypeError: undefined is not a function

    at cParser.Parser.enterRule (/Users/clive/node_modules/antlr4/Parser.js:433:32)

    at cParser.jline (/Users/clive/parser/js/cParser.js:184:10)

    at Object.<anonymous> (/Users/clive/parser/js/runner.js:11:19)

    at Module._compile (module.js:460:26)

    at Object.Module._extensions..js (module.js:478:10)

    at Module.load (module.js:355:32)

    at Function.Module._load (module.js:310:12)

    at Function.Module.runMain (module.js:501:10)

    at startup (node.js:129:16)

    at node.js:814:3

Here's my running script mostly cut and pasted from the antlr confluence :

var input = "a"

var antlr4 = require("antlr4");

var cLexer = require("./cLexer.js")

var cParser = require("./cParser.js")

var chars = new antlr4.InputStream(input);

var lexer = new cLexer.cLexer(chars);

var tokens = antlr4.CommonTokenStream(lexer);

var parser = new cParser.cParser(tokens);

parser.buildParseTrees = true ;

var tree = parser.jline();

--------------------------

The lexer grammar:

lexer grammar cLexer ;

SPC : ' ' ;

UNQUOTED_REF_CHARS : ~[ \t\r\n$\[\]{}\'"\(\)] ;

WS : [\t\r\n] -> skip ;

----------------------

The Parser Grammar:

parser grammar cParser ;

options {

  tokenVocab = cLexer ;

}

cfile : jline+ ;

jline : SPC* key ;

key : UNQUOTED_REF_CHARS+ ;

----------------------------

[Clive]

Forgot to add - i'm generating the grammar by saying:

antlr4 -Dlanguage=JavaScript cLexer.g4

antlr4 -Dlanguage=JavaScript cParser.g4

where antlr4 is the usual alias from the book - 

alias antlr4 = "java -jar /Users/clive/antlr4/antlr-4.5-complete.jar"

thanks

Clive

[Eric Vergnaud]

shouldn't 

var tokens = antlr4.CommonTokenStream(lexer);

be

var tokens = new antlr4.CommonTokenStream(lexer);

?

[Clive]

Duh, that's quite possible, i'll try it. Thank you very much for the response Eric !

clive