Switch command-line mode backend from Rhino to Node

redux
David Majda 14 years ago
parent e25dcfbac8
commit 814ce7d9db

@ -46,7 +46,7 @@ The [online generator](http://pegjs.majda.cz/online) is easiest to use — you j
To generate the parser from JavaScript code, include the `lib/compiler.js` file and use the `PEG.buildParser` function. This function accepts a string with a grammar and either returns the built parser object or throws an exception if the grammar is invalid.
To generate the parser from a command line, you need to have Java installed (so that [Rhino](http://www.mozilla.org/rhino/) — which is included in PEG.js — can run). Use the `bin/pegjs` script on Unix or `bin/pegjs.bat` batch file on Windows:
To generate the parser from a command line, you need to have [Node](http://nodejs.org/) installed. Then use the `bin/pegjs` script:
$ bin/pegjs --export-var arithmeticsParser examples/arithmetics.pegjs
@ -72,4 +72,4 @@ Both the parser generator and generated parsers should run well in the following
* Chrome
* Safari
* Opera
* Rhino
* Node

@ -1,10 +1,127 @@
#!/bin/sh
#!/usr/bin/env node
if [ -L "$0" ]; then
THIS_FILE=`readlink "$0"`
else
THIS_FILE=$0
fi
DIR=`dirname "$THIS_FILE"`
var sys = require("sys");
var fs = require("fs");
var PEG = require("../lib/peg");
java -jar "$DIR/../vendor/rhino/js.jar" "$DIR/pegjs-main.js" "$DIR" "$@"
/* ===== 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: \"exports.parser\")");
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 = "exports.parser";
while (args.length > 0 && isOption(args[0])) {
switch (args[0]) {
case "-e":
case "--export-var":
nextArg();
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 inputStream = fs.createReadStream(args[0]);
var outputStream = fs.createWriteStream(
args.length == 1 ? args[0].replace(/\.[^.]*$/, ".js") : args[1]
);
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();
});

@ -1,155 +0,0 @@
importPackage(java.io);
importPackage(java.lang);
/*
* Rhino does not have __FILE__ or anything similar so we have to pass the
* script path from the outside.
*/
load(arguments[0] + "/../lib/peg.js");
var FILE_STDIN = "-";
var FILE_STDOUT = "-";
function readFile(file) {
var f = new BufferedReader(new InputStreamReader(
file === FILE_STDIN ? System["in"] : new FileInputStream(file)
));
var result = "";
var line = "";
try {
while ((line = f.readLine()) !== null) {
result += line + "\n";
}
} finally {
f.close();
}
return result;
}
function writeFile(file, text) {
var f = new BufferedWriter(new OutputStreamWriter(
file === FILE_STDOUT ? System.out : new FileOutputStream(file)
));
try {
f.write(text);
} finally {
f.close();
}
}
function isOption(arg) {
return /-.+/.test(arg);
}
function printVersion() {
print("PEG.js " + PEG.VERSION);
}
function printHelp() {
print("Usage: pegjs [options] [--] [<input_file>] [<output_file>]");
print("");
print("Generates a parser from the PEG grammar specified in the <input_file> and");
print("writes it to the <output_file>.");
print("");
print("If the <output_file> is omitted, its name is generated by changing the");
print("<input_file> extension to \".js\". If both <input_file> and <output_file> are");
print("omitted, standard input and output are used.");
print("");
print("Options:");
print(" -e, --export-var <variable> name of the variable where the parser object");
print(" will be stored (default: \"exports.parser\")");
print(" -v, --version print version information and exit");
print(" -h, --help print help and exit");
}
function nextArg() {
args.shift();
}
function exitSuccess() {
quit(0);
}
function exitFailure() {
quit(1);
}
function abort(message) {
System.out.println(message);
exitFailure();
}
/* This makes the generated parser a CommonJS module by default. */
var exportVar = "exports.parser";
/*
* The trimmed first argument is the script path -- see the beginning of this
* file.
*/
var args = Array.prototype.slice.call(arguments, 1);
while (args.length > 0 && isOption(args[0])) {
switch (args[0]) {
case "-e":
case "--export-var":
nextArg();
exportVar = args[0];
break;
case "--version":
printVersion();
exitSuccess();
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 inputFile = FILE_STDIN;
var outputFile = FILE_STDOUT;
break;
case 1:
var inputFile = args[0];
var outputFile = args[0].replace(/\.[^.]*$/, ".js");
break;
case 2:
var inputFile = args[0];
var outputFile = args[1];
break;
default:
abort("Too many arguments.");
}
var input = readFile(inputFile);
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);
}
}
writeFile(outputFile, exportVar + " = " + parser.toSource() + ";\n");

@ -1,6 +0,0 @@
@echo off
set DIR_WITH_SLASH=%~dp0
set DIR=%DIR_WITH_SLASH:~0,-1%
java -jar "%DIR%\..\vendor\rhino\js.jar" "%DIR%\pegjs-main.js" "%DIR%" %*

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vendor/rhino/js.jar vendored

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