mirror of https://github.com/lukechilds/node.git
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this creates a new internal module responsible for providing the repl created via "iojs" or "iojs -i," and adds the following options to the readline and repl subsystems: * "repl mode" - determine whether a repl is strict mode, sloppy mode, or auto-detect mode. * historySize - determine the maximum number of lines a repl will store as history. The built-in repl gains persistent history support when the NODE_REPL_HISTORY_FILE environment variable is set. This functionality is not exposed to userland repl instances. PR-URL: https://github.com/iojs/io.js/pull/1513 Reviewed-By: Fedor Indutny <fedor@indutny.com>v2.0.2
Chris Dickinson
10 years ago
10 changed files with 394 additions and 61 deletions
@ -0,0 +1,168 @@ |
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'use strict'; |
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module.exports = {createRepl: createRepl}; |
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const Interface = require('readline').Interface; |
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const REPL = require('repl'); |
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const path = require('path'); |
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// XXX(chrisdickinson): The 15ms debounce value is somewhat arbitrary.
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// The debounce is to guard against code pasted into the REPL.
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const kDebounceHistoryMS = 15; |
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try { |
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// hack for require.resolve("./relative") to work properly.
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module.filename = path.resolve('repl'); |
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} catch (e) { |
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// path.resolve('repl') fails when the current working directory has been
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// deleted. Fall back to the directory name of the (absolute) executable
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// path. It's not really correct but what are the alternatives?
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const dirname = path.dirname(process.execPath); |
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module.filename = path.resolve(dirname, 'repl'); |
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} |
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// hack for repl require to work properly with node_modules folders
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module.paths = require('module')._nodeModulePaths(module.filename); |
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function createRepl(env, cb) { |
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const opts = { |
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useGlobal: true, |
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ignoreUndefined: false |
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}; |
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if (parseInt(env.NODE_NO_READLINE)) { |
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opts.terminal = false; |
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} |
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if (parseInt(env.NODE_DISABLE_COLORS)) { |
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opts.useColors = false; |
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} |
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opts.replMode = { |
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'strict': REPL.REPL_MODE_STRICT, |
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'sloppy': REPL.REPL_MODE_SLOPPY, |
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'magic': REPL.REPL_MODE_MAGIC |
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}[String(env.NODE_REPL_MODE).toLowerCase().trim()]; |
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if (opts.replMode === undefined) { |
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opts.replMode = REPL.REPL_MODE_MAGIC; |
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} |
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const historySize = Number(env.NODE_REPL_HISTORY_SIZE); |
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if (!isNaN(historySize) && historySize > 0) { |
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opts.historySize = historySize; |
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} else { |
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// XXX(chrisdickinson): set here to avoid affecting existing applications
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// using repl instances.
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opts.historySize = 1000; |
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} |
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const repl = REPL.start(opts); |
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if (env.NODE_REPL_HISTORY_PATH) { |
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return setupHistory(repl, env.NODE_REPL_HISTORY_PATH, cb); |
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} |
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repl._historyPrev = _replHistoryMessage; |
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cb(null, repl); |
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} |
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function setupHistory(repl, historyPath, ready) { |
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const fs = require('fs'); |
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var timer = null; |
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var writing = false; |
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var pending = false; |
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repl.pause(); |
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fs.open(historyPath, 'a+', oninit); |
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function oninit(err, hnd) { |
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if (err) { |
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return ready(err); |
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} |
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fs.close(hnd, onclose); |
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} |
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function onclose(err) { |
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if (err) { |
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return ready(err); |
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} |
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fs.readFile(historyPath, 'utf8', onread); |
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} |
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function onread(err, data) { |
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if (err) { |
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return ready(err); |
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} |
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if (data) { |
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try { |
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repl.history = JSON.parse(data); |
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if (!Array.isArray(repl.history)) { |
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throw new Error('Expected array, got ' + typeof repl.history); |
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} |
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repl.history.slice(-repl.historySize); |
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} catch (err) { |
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return ready( |
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new Error(`Could not parse history data in ${historyPath}.`)); |
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} |
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} |
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fs.open(historyPath, 'w', onhandle); |
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} |
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function onhandle(err, hnd) { |
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if (err) { |
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return ready(err); |
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} |
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repl._historyHandle = hnd; |
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repl.on('line', online); |
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repl.resume(); |
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return ready(null, repl); |
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} |
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// ------ history listeners ------
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function online() { |
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repl._flushing = true; |
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if (timer) { |
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clearTimeout(timer); |
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} |
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timer = setTimeout(flushHistory, kDebounceHistoryMS); |
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} |
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function flushHistory() { |
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timer = null; |
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if (writing) { |
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pending = true; |
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return; |
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} |
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writing = true; |
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const historyData = JSON.stringify(repl.history, null, 2); |
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fs.write(repl._historyHandle, historyData, 0, 'utf8', onwritten); |
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} |
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function onwritten(err, data) { |
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writing = false; |
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if (pending) { |
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pending = false; |
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online(); |
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} else { |
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repl._flushing = Boolean(timer); |
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if (!repl._flushing) { |
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repl.emit('flushHistory'); |
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} |
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} |
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} |
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} |
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function _replHistoryMessage() { |
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if (this.history.length === 0) { |
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this._writeToOutput( |
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'\nPersistent history support disabled. ' + |
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'Set the NODE_REPL_HISTORY_PATH environment variable to ' + |
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'a valid, user-writable path to enable.\n' |
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); |
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this._refreshLine(); |
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} |
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this._historyPrev = Interface.prototype._historyPrev; |
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return this._historyPrev(); |
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} |
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@ -0,0 +1,84 @@ |
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var common = require('../common'); |
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var assert = require('assert'); |
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var Stream = require('stream'); |
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var repl = require('repl'); |
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common.globalCheck = false; |
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var tests = [ |
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testSloppyMode, |
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testStrictMode, |
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testAutoMode |
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]; |
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tests.forEach(function(test) { |
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test(); |
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}); |
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function testSloppyMode() { |
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var cli = initRepl(repl.REPL_MODE_SLOPPY); |
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cli.input.emit('data', ` |
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x = 3 |
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`.trim() + '\n');
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assert.equal(cli.output.accumulator.join(''), '> 3\n> ') |
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cli.output.accumulator.length = 0; |
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cli.input.emit('data', ` |
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let y = 3 |
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`.trim() + '\n');
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assert.ok(/SyntaxError: Block-scoped/.test( |
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cli.output.accumulator.join(''))); |
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} |
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function testStrictMode() { |
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var cli = initRepl(repl.REPL_MODE_STRICT); |
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cli.input.emit('data', ` |
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x = 3 |
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`.trim() + '\n');
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assert.ok(/ReferenceError: x is not defined/.test( |
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cli.output.accumulator.join(''))); |
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cli.output.accumulator.length = 0; |
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cli.input.emit('data', ` |
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let y = 3 |
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`.trim() + '\n');
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assert.equal(cli.output.accumulator.join(''), 'undefined\n> '); |
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} |
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function testAutoMode() { |
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var cli = initRepl(repl.REPL_MODE_MAGIC); |
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cli.input.emit('data', ` |
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x = 3 |
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`.trim() + '\n');
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assert.equal(cli.output.accumulator.join(''), '> 3\n> ') |
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cli.output.accumulator.length = 0; |
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cli.input.emit('data', ` |
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let y = 3 |
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`.trim() + '\n');
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assert.equal(cli.output.accumulator.join(''), 'undefined\n> '); |
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} |
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function initRepl(mode) { |
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var input = new Stream(); |
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input.write = input.pause = input.resume = function(){}; |
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input.readable = true; |
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var output = new Stream(); |
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output.write = output.pause = output.resume = function(buf) { |
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output.accumulator.push(buf); |
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}; |
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output.accumulator = []; |
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output.writable = true; |
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return repl.start({ |
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input: input, |
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output: output, |
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useColors: false, |
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terminal: false, |
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replMode: mode |
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}); |
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} |
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