Jison Gist for processing Java Generics like strings

json_generics.js

var Parser = require("jison").Parser;

var grammar = {
    "lex": {
        "rules": [
           ["\\s+",         "/* skip whitespace */"],
           [",",            "return ','"],
           ["<",            "return '<'"],
           [">",            "return '>'"],
           ["array",        "return 'ARRAY'"],
           ["undefined|boolean|object|number|string",    "return 'SIMPLETYPE'"],
           ["$",            "return 'EOF'"]
        ]
    },

    "bnf": {
        // apparently you have to use the expressions tag for the return
        "expressions"    : [["typeList EOF","return $1;"]],
        "typeList"       : [[ "typeList , type", "$$ = ($1 instanceof Array) ? ($1).concat($3) : [$1,$3];"],
                            [ "type","$$ = $1;" ]],
        "type"           : [[ "genericArray", "$$ = $1;"],
                            [ "ARRAY", "$$ = $1;"],
                            [ "SIMPLETYPE", "$$ = $1;" ]],
        "genericArray"   : [[ "ARRAY < typeList >", "$$ = { \"arrayTypes\" : $3 };" ]]
    }
};

var parser = new Parser(grammar);

// generate source, ready to be written to disk
var parserSource = parser.generate();

// you can also use the parser directly from memory

console.log('======================');
parser.parse("number");
console.log('======================');
parser.parse("string,number");
console.log('======================');
parser.parse("string,number,array,boolean");
var result = parser.parse("string,array<number,string,array<string,object>>,number,array<array>");
console.log(result);

// throws lexical error