Added pegjs

Which is going to replace uglify
2026-09-15 14:21:23 +00:00 · 2011-12-28 18:03:07 +00:00
parent e27d5392a1
commit b27a99a7fb
13 changed files with 9459 additions and 0 deletions
@@ -0,0 +1,142 @@
+#!/usr/bin/env node
+
+var sys = require("sys");
+var fs  = require("fs");
+var PEG = require("../lib/peg");
+
+/* Helpers */
+
+function printVersion() {
+  sys.puts("PEG.js " + PEG.VERSION);
+}
+
+function printHelp() {
+  sys.puts("Usage: pegjs [options] [--] [<input_file>] [<output_file>]");
+  sys.puts("");
+  sys.puts("Generates a parser from the PEG grammar specified in the <input_file> and");
+  sys.puts("writes it to the <output_file>.");
+  sys.puts("");
+  sys.puts("If the <output_file> is omitted, its name is generated by changing the");
+  sys.puts("<input_file> extension to \".js\". If both <input_file> and <output_file> are");
+  sys.puts("omitted, standard input and output are used.");
+  sys.puts("");
+  sys.puts("Options:");
+  sys.puts("  -e, --export-var <variable>  name of the variable where the parser object");
+  sys.puts("                               will be stored (default: \"module.exports\")");
+  sys.puts("  -v, --version                print version information and exit");
+  sys.puts("  -h, --help                   print help and exit");
+}
+
+function exitSuccess() {
+  process.exit(0);
+}
+
+function exitFailure() {
+  process.exit(1);
+}
+
+function abort(message) {
+  sys.error(message);
+  exitFailure();
+}
+
+/* Arguments */
+
+var args = process.argv.slice(2); // Trim "node" and the script path.
+
+function isOption(arg) {
+  return /-.+/.test(arg);
+}
+
+function nextArg() {
+  args.shift();
+}
+
+/* Files */
+
+function readStream(inputStream, callback) {
+  var input = "";
+  inputStream.on("data", function(data) { input += data; });
+  inputStream.on("end", function() { callback(input); });
+}
+
+/* Main */
+
+/* This makes the generated parser a CommonJS module by default. */
+var exportVar = "module.exports";
+
+while (args.length > 0 && isOption(args[0])) {
+  switch (args[0]) {
+    case "-e":
+    case "--export-var":
+      nextArg();
+      if (args.length === 0) {
+        abort("Missing parameter of the -e/--export-var option.");
+      }
+      exportVar = args[0];
+      break;
+
+    case "-v":
+    case "--version":
+      printVersion();
+      exitSuccess();
+      break;
+
+    case "-h":
+    case "--help":
+      printHelp();
+      exitSuccess();
+      break;
+
+    case "--":
+      nextArg();
+      break;
+
+    default:
+      abort("Unknown option: " + args[0] + ".");
+  }
+  nextArg();
+}
+
+switch (args.length) {
+  case 0:
+    var inputStream = process.openStdin();
+    var outputStream = process.stdout;
+    break;
+
+  case 1:
+  case 2:
+    var inputFile = args[0];
+    var inputStream = fs.createReadStream(inputFile);
+    inputStream.on("error", function() {
+      abort("Can't read from file \"" + inputFile + "\".");
+    });
+
+    var outputFile = args.length == 1
+      ? args[0].replace(/\.[^.]*$/, ".js")
+      : args[1];
+    var outputStream = fs.createWriteStream(outputFile);
+    outputStream.on("error", function() {
+      abort("Can't write to file \"" + outputFile + "\".");
+    });
+
+    break;
+
+  default:
+    abort("Too many arguments.");
+}
+
+readStream(inputStream, function(input) {
+  try {
+    var parser = PEG.buildParser(input);
+  } catch (e) {
+    if (e.line !== undefined && e.column !== undefined) {
+      abort(e.line + ":" + e.column + ": " + e.message);
+    } else {
+      abort(e.message);
+    }
+  }
+
+  outputStream.write(exportVar + " = " + parser.toSource() + ";\n");
+  outputStream.end();
+});