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152 lines
3.6 KiB
JavaScript
152 lines
3.6 KiB
JavaScript
#!/usr/bin/env node
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var util = require("util");
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var fs = require("fs");
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var PEG = require("../lib/peg");
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/* Helpers */
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function printVersion() {
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util.puts("PEG.js " + PEG.VERSION);
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}
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function printHelp() {
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util.puts("Usage: pegjs [options] [--] [<input_file>] [<output_file>]");
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util.puts("");
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util.puts("Generates a parser from the PEG grammar specified in the <input_file> and");
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util.puts("writes it to the <output_file>.");
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util.puts("");
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util.puts("If the <output_file> is omitted, its name is generated by changing the");
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util.puts("<input_file> extension to \".js\". If both <input_file> and <output_file> are");
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util.puts("omitted, standard input and output are used.");
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util.puts("");
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util.puts("Options:");
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util.puts(" -e, --export-var <variable> name of the variable where the parser object");
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util.puts(" will be stored (default: \"module.exports\")");
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util.puts(" --track-line-and-column make generated parser track line and column");
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util.puts(" -v, --version print version information and exit");
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util.puts(" -h, --help print help and exit");
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}
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function exitSuccess() {
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process.exit(0);
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}
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function exitFailure() {
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process.exit(1);
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}
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function abort(message) {
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util.error(message);
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exitFailure();
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}
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/* Arguments */
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var args = process.argv.slice(2); // Trim "node" and the script path.
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function isOption(arg) {
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return /^-/.test(arg);
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}
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function nextArg() {
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args.shift();
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}
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/* Files */
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function readStream(inputStream, callback) {
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var input = "";
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inputStream.on("data", function(data) { input += data; });
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inputStream.on("end", function() { callback(input); });
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}
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/* Main */
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/* This makes the generated parser a CommonJS module by default. */
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var exportVar = "module.exports";
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var options = { trackLineAndColumn: false };
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while (args.length > 0 && isOption(args[0])) {
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switch (args[0]) {
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case "-e":
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case "--export-var":
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nextArg();
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if (args.length === 0) {
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abort("Missing parameter of the -e/--export-var option.");
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}
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exportVar = args[0];
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break;
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case "--track-line-and-column":
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options.trackLineAndColumn = true;
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break;
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case "-v":
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case "--version":
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printVersion();
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exitSuccess();
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break;
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case "-h":
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case "--help":
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printHelp();
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exitSuccess();
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break;
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case "--":
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nextArg();
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break;
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default:
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abort("Unknown option: " + args[0] + ".");
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}
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nextArg();
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}
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switch (args.length) {
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case 0:
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process.stdin.resume();
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var inputStream = process.stdin;
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var outputStream = process.stdout;
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break;
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case 1:
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case 2:
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var inputFile = args[0];
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var inputStream = fs.createReadStream(inputFile);
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inputStream.on("error", function() {
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abort("Can't read from file \"" + inputFile + "\".");
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});
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var outputFile = args.length == 1
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? args[0].replace(/\.[^.]*$/, ".js")
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: args[1];
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var outputStream = fs.createWriteStream(outputFile);
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outputStream.on("error", function() {
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abort("Can't write to file \"" + outputFile + "\".");
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});
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break;
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default:
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abort("Too many arguments.");
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}
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readStream(inputStream, function(input) {
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try {
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var parser = PEG.buildParser(input, options);
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} catch (e) {
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if (e.line !== undefined && e.column !== undefined) {
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abort(e.line + ":" + e.column + ": " + e.message);
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} else {
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abort(e.message);
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}
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}
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outputStream.write(exportVar + " = " + parser.toSource() + ";\n");
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if (outputStream !== process.stdout) {
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outputStream.end();
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}
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});
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