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generate.js
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generate.js
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(function () {
function serializeRules(rules, builtinPostprocessors) {
return "[\n " + rules.map(function(rule) {
return serializeRule(rule, builtinPostprocessors);
}).join(",\n ") + "\n]";
}
function dedentFunc(func) {
var lines = func.toString().split(/\n/);
if (lines.length === 1) {
return [lines[0].replace(/^\s+|\s+$/g, '')];
}
var indent = null;
var tail = lines.slice(1);
for (var i = 0; i < tail.length; i++) {
var match = /^\s*/.exec(tail[i]);
if (match && match[0].length !== tail[i].length) {
if (indent === null ||
match[0].length < indent.length) {
indent = match[0];
}
}
}
if (indent === null) {
return lines;
}
return lines.map(function dedent(line) {
if (line.slice(0, indent.length) === indent) {
return line.slice(indent.length);
}
return line;
});
}
function tabulateString(string, indent, options) {
var lines;
if(Array.isArray(string)) {
lines = string;
} else {
lines = string.toString().split('\n');
}
options = options || {};
tabulated = lines.map(function addIndent(line, i) {
var shouldIndent = true;
if(i == 0 && !options.indentFirst) {
shouldIndent = false;
}
if(shouldIndent) {
return indent + line;
} else {
return line;
}
}).join('\n');
return tabulated;
}
function serializeSymbol(s) {
if (s instanceof RegExp) {
return s.toString();
} else if (s.token) {
return s.token;
} else {
return JSON.stringify(s);
}
}
function serializeRule(rule, builtinPostprocessors) {
var ret = '{';
ret += '"name": ' + JSON.stringify(rule.name);
ret += ', "symbols": [' + rule.symbols.map(serializeSymbol).join(', ') + ']';
if (rule.postprocess) {
if(rule.postprocess.builtin) {
rule.postprocess = builtinPostprocessors[rule.postprocess.builtin];
}
ret += ', "postprocess": ' + tabulateString(dedentFunc(rule.postprocess), ' ', {indentFirst: false});
}
ret += '}';
return ret;
}
var generate = function (parser, exportName) {
if(!parser.config.preprocessor) {
parser.config.preprocessor = "_default";
}
if(!generate[parser.config.preprocessor]) {
throw new Error("No such preprocessor: " + parser.config.preprocessor)
}
return generate[parser.config.preprocessor](parser, exportName);
};
generate.js = generate._default = generate.javascript = function (parser, exportName) {
var output = "// Generated automatically by nearley\n";
output += "// http://github.com/Hardmath123/nearley\n";
output += "(function () {\n";
output += "function id(x) {return x[0]; }\n";
output += parser.body.join('\n');
output += "var grammar = {\n";
output += " ParserRules: " +
serializeRules(parser.rules, generate.javascript.builtinPostprocessors)
+ "\n";
output += " , ParserStart: " + JSON.stringify(parser.start) + "\n";
output += "}\n";
output += "if (typeof module !== 'undefined'"
+ "&& typeof module.exports !== 'undefined') {\n";
output += " module.exports = grammar;\n";
output += "} else {\n";
output += " window." + exportName + " = grammar;\n";
output += "}\n";
output += "})();\n";
return output;
};
generate.javascript.builtinPostprocessors = {
"joiner": "function joiner(d) {return d.join('');}",
"arrconcat": "function arrconcat(d) {return [d[0]].concat(d[1]);}",
"nuller": "function(d) {return null;}",
"id": "id"
}
generate.cs = generate.coffee = generate.coffeescript = function (parser, exportName) {
var output = "# Generated automatically by nearley\n";
output += "# http://github.com/Hardmath123/nearley\n";
output += "do ->\n";
output += " id = (d)->d[0]\n";
output += tabulateString(dedentFunc(parser.body.join('\n')), ' ') + '\n';
output += " grammar = {\n";
output += " ParserRules: " +
tabulateString(
serializeRules(parser.rules, generate.coffeescript.builtinPostprocessors),
' ',
{indentFirst: false})
+ ",\n";
output += " ParserStart: " + JSON.stringify(parser.start) + "\n";
output += " }\n";
output += " if typeof module != 'undefined' "
+ "&& typeof module.exports != 'undefined'\n";
output += " module.exports = grammar;\n";
output += " else\n";
output += " window." + exportName + " = grammar;\n";
return output;
};
generate.coffeescript.builtinPostprocessors = {
"joiner": "(d) -> d.join('')",
"arrconcat": "(d) -> [d[0]].concat(d[1])",
"nuller": "() -> null",
"id": "id"
}
if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
module.exports = generate;
} else {
window.generate = generate;
}
})();