pegjs-otf
Version:
On-The-Fly Compilation for PEG.js
68 lines (58 loc) • 2.56 kB
JavaScript
/*
** pegjs-otf -- On-The-Fly Compilation for PEG.js
** Copyright (c) 2014-2024 Dr. Ralf S. Engelschall <rse@engelschall.com>
**
** Permission is hereby granted, free of charge, to any person obtaining
** a copy of this software and associated documentation files (the
** "Software"), to deal in the Software without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Software, and to
** permit persons to whom the Software is furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be included
** in all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
** SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* global module: false */
/* global require: false */
/* built-in requirements */
var fs = require("fs");
var path = require("path");
/* external requirements */
var peggy = require("peggy");
var sm = require("static-module");
var through = require("through");
/* Browserify transform */
module.exports = function (file /*, options */) {
/* act on JavaScript files only */
if (path.extname(file) !== ".js")
return through();
/* act on all calls to method "generateFromFile" of module "pegjs-otf" */
return sm({
"pegjs-otf": {
"generateFromFile": function (filename, options) {
/* read the grammar definition */
var source = fs.readFileSync(filename, { encoding: "utf8" });
/* enfore source code output */
options.output = "source";
/* generate the parser with regular PEG.js API */
var parser = peggy.generate(source, options);
/* replace the "generateFromFile(...)" call with the generated parser */
return "(" + parser + ")";
}
}
}, {
vars: {
/* allow "__dirname" to be used in "generateFromFile(...)" calls */
__dirname: path.dirname(file)
}
});
};