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// Copyright Joyent, Inc. and other Node contributors.
//
// 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.
14 years ago
/* A repl library that you can include in your own code to get a runtime
* interface to your program.
*
* var repl = require("repl");
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* // start repl on stdin
* repl.start("prompt> ");
*
* // listen for unix socket connections and start repl on them
* net.createServer(function(socket) {
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* repl.start("node via Unix socket> ", socket);
* }).listen("/tmp/node-repl-sock");
*
* // listen for TCP socket connections and start repl on them
* net.createServer(function(socket) {
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* repl.start("node via TCP socket> ", socket);
* }).listen(5001);
*
* // expose foo to repl context
* repl.start("node > ").context.foo = "stdin is fun";
*/
var util = require('util');
var inherits = require('util').inherits;
var Stream = require('stream');
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var vm = require('vm');
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var path = require('path');
var fs = require('fs');
var rl = require('readline');
var Console = require('console').Console;
var EventEmitter = require('events').EventEmitter;
// If obj.hasOwnProperty has been overridden, then calling
// obj.hasOwnProperty(prop) will break.
// See: https://github.com/joyent/node/issues/1707
function hasOwnProperty(obj, prop) {
return Object.prototype.hasOwnProperty.call(obj, prop);
}
// hack for require.resolve("./relative") to work properly.
module.filename = path.resolve('repl');
// hack for repl require to work properly with node_modules folders
module.paths = require('module')._nodeModulePaths(module.filename);
// Can overridden with custom print functions, such as `probe` or `eyes.js`.
// This is the default "writer" value if none is passed in the REPL options.
exports.writer = util.inspect;
exports._builtinLibs = ['assert', 'buffer', 'child_process', 'cluster',
'crypto', 'dgram', 'dns', 'domain', 'events', 'fs', 'http', 'https', 'net',
'os', 'path', 'punycode', 'querystring', 'readline', 'stream',
'string_decoder', 'tls', 'tty', 'url', 'util', 'vm', 'zlib'];
14 years ago
function REPLServer(prompt, stream, eval_, useGlobal, ignoreUndefined) {
if (!(this instanceof REPLServer)) {
return new REPLServer(prompt, stream, eval_, useGlobal, ignoreUndefined);
}
EventEmitter.call(this);
var options, input, output;
if (typeof prompt == 'object') {
// an options object was given
options = prompt;
stream = options.stream || options.socket;
input = options.input;
output = options.output;
eval_ = options.eval;
useGlobal = options.useGlobal;
ignoreUndefined = options.ignoreUndefined;
prompt = options.prompt;
} else if (typeof prompt != 'string') {
throw new Error('An options Object, or a prompt String are required');
} else {
options = {};
}
var self = this;
self.useGlobal = !!useGlobal;
self.ignoreUndefined = !!ignoreUndefined;
self.eval = eval_ || function(code, context, file, cb) {
var err, result;
try {
if (self.useGlobal) {
result = vm.runInThisContext(code, file);
} else {
result = vm.runInContext(code, context, file);
}
} catch (e) {
err = e;
}
if (err && process.domain) {
process.domain.emit('error', err);
process.domain.exit();
}
else {
cb(err, result);
}
};
if (!input && !output) {
// legacy API, passing a 'stream'/'socket' option
if (!stream) {
// use stdin and stdout as the default streams if none were given
stream = process;
}
if (stream.stdin && stream.stdout) {
// We're given custom object with 2 streams, or the `process` object
input = stream.stdin;
output = stream.stdout;
} else {
// We're given a duplex readable/writable Stream, like a `net.Socket`
input = stream;
output = stream;
}
}
self.inputStream = input;
self.outputStream = output;
self.resetContext();
self.bufferedCommand = '';
self.prompt = (prompt != undefined ? prompt : '> ');
function complete(text, callback) {
self.complete(text, callback);
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}
var rli = rl.createInterface({
input: self.inputStream,
output: self.outputStream,
completer: complete,
terminal: options.terminal
});
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self.rli = rli;
this.commands = {};
defineDefaultCommands(this);
// figure out which "writer" function to use
self.writer = options.writer || exports.writer;
if (typeof options.useColors === 'undefined') {
options.useColors = rli.terminal;
}
self.useColors = !!options.useColors;
if (self.useColors && self.writer === util.inspect) {
// Turn on ANSI coloring.
self.writer = function(obj, showHidden, depth) {
return util.inspect(obj, showHidden, depth, true);
};
}
rli.setPrompt(self.prompt);
rli.on('close', function() {
self.emit('exit');
});
var sawSIGINT = false;
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rli.on('SIGINT', function() {
var empty = rli.line.length === 0;
rli.clearLine();
if (!(self.bufferedCommand && self.bufferedCommand.length > 0) && empty) {
if (sawSIGINT) {
rli.close();
sawSIGINT = false;
return;
}
rli.output.write('(^C again to quit)\n');
sawSIGINT = true;
} else {
sawSIGINT = false;
}
self.bufferedCommand = '';
self.displayPrompt();
});
rli.on('line', function(cmd) {
sawSIGINT = false;
var skipCatchall = false;
cmd = trimWhitespace(cmd);
// Check to see if a REPL keyword was used. If it returns true,
// display next prompt and return.
if (cmd && cmd.charAt(0) === '.' && isNaN(parseFloat(cmd))) {
var matches = cmd.match(/^(\.[^\s]+)\s*(.*)$/);
var keyword = matches && matches[1];
var rest = matches && matches[2];
if (self.parseREPLKeyword(keyword, rest) === true) {
return;
} else {
self.outputStream.write('Invalid REPL keyword\n');
skipCatchall = true;
}
}
if (!skipCatchall) {
var evalCmd = self.bufferedCommand + cmd + '\n';
// This try is for determining if the command is complete, or should
// continue onto the next line.
// We try to evaluate both expressions e.g.
// '{ a : 1 }'
// and statements e.g.
// 'for (var i = 0; i < 10; i++) console.log(i);'
// First we attempt to eval as expression with parens.
// This catches '{a : 1}' properly.
self.eval('(' + evalCmd + ')',
self.context,
'repl',
function(e, ret) {
if (e && !isSyntaxError(e)) return finish(e);
if (typeof ret === 'function' &&
/^[\r\n\s]*function/.test(evalCmd) ||
e) {
// Now as statement without parens.
self.eval(evalCmd, self.context, 'repl', finish);
} else {
finish(null, ret);
}
});
} else {
finish(null);
}
function finish(e, ret) {
self.memory(cmd);
// If error was SyntaxError and not JSON.parse error
if (isSyntaxError(e)) {
if (!self.bufferedCommand && cmd.trim().match(/^npm /)) {
self.outputStream.write('npm should be run outside of the ' +
'node repl, in your normal shell.\n' +
'(Press Control-D to exit.)\n');
self.bufferedCommand = '';
self.displayPrompt();
return;
}
// Start buffering data like that:
// {
// ... x: 1
// ... }
self.bufferedCommand += cmd + '\n';
self.displayPrompt();
return;
} else if (e) {
self.outputStream.write((e.stack || e) + '\n');
}
// Clear buffer if no SyntaxErrors
self.bufferedCommand = '';
// If we got any output - print it (if no error)
if (!e && (!self.ignoreUndefined || ret !== undefined)) {
self.context._ = ret;
self.outputStream.write(self.writer(ret) + '\n');
}
// Display prompt again
self.displayPrompt();
};
});
rli.on('SIGCONT', function() {
self.displayPrompt(true);
});
self.displayPrompt();
}
inherits(REPLServer, EventEmitter);
exports.REPLServer = REPLServer;
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// prompt is a string to print on each line for the prompt,
// source is a stream to use for I/O, defaulting to stdin/stdout.
exports.start = function(prompt, source, eval_, useGlobal, ignoreUndefined) {
var repl = new REPLServer(prompt, source, eval_, useGlobal, ignoreUndefined);
if (!exports.repl) exports.repl = repl;
return repl;
};
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REPLServer.prototype.createContext = function() {
var context;
if (this.useGlobal) {
context = global;
} else {
context = vm.createContext();
for (var i in global) context[i] = global[i];
context.console = new Console(this.outputStream);
context.global = context;
context.global.global = context;
}
context.module = module;
context.require = require;
this.lines = [];
this.lines.level = [];
// make built-in modules available directly
// (loaded lazily)
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exports._builtinLibs.forEach(function(name) {
Object.defineProperty(context, name, {
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get: function() {
var lib = require(name);
context._ = context[name] = lib;
return lib;
},
// allow the creation of other globals with this name
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set: function(val) {
delete context[name];
context[name] = val;
},
configurable: true
});
});
return context;
};
REPLServer.prototype.resetContext = function() {
this.context = this.createContext();
};
REPLServer.prototype.displayPrompt = function(preserveCursor) {
var prompt = this.prompt;
if (this.bufferedCommand.length) {
prompt = '...';
var levelInd = new Array(this.lines.level.length).join('..');
prompt += levelInd + ' ';
}
this.rli.setPrompt(prompt);
this.rli.prompt(preserveCursor);
};
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// A stream to push an array into a REPL
// used in REPLServer.complete
function ArrayStream() {
Stream.call(this);
this.run = function(data) {
var self = this;
data.forEach(function(line) {
self.emit('data', line + '\n');
});
}
}
util.inherits(ArrayStream, Stream);
ArrayStream.prototype.readable = true;
ArrayStream.prototype.writable = true;
ArrayStream.prototype.resume = function() {};
ArrayStream.prototype.write = function() {};
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var requireRE = /\brequire\s*\(['"](([\w\.\/-]+\/)?([\w\.\/-]*))/;
var simpleExpressionRE =
/(([a-zA-Z_$](?:\w|\$)*)\.)*([a-zA-Z_$](?:\w|\$)*)\.?$/;
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// Provide a list of completions for the given leading text. This is
// given to the readline interface for handling tab completion.
//
// Example:
// complete('var foo = util.')
// -> [['util.print', 'util.debug', 'util.log', 'util.inspect', 'util.pump'],
// 'util.' ]
//
// Warning: This eval's code like "foo.bar.baz", so it will run property
// getter code.
REPLServer.prototype.complete = function(line, callback) {
// There may be local variables to evaluate, try a nested REPL
if (this.bufferedCommand != undefined && this.bufferedCommand.length) {
// Get a new array of inputed lines
var tmp = this.lines.slice();
// Kill off all function declarations to push all local variables into
// global scope
this.lines.level.forEach(function(kill) {
if (kill.isFunction) {
tmp[kill.line] = '';
}
});
var flat = new ArrayStream(); // make a new "input" stream
var magic = new REPLServer('', flat); // make a nested REPL
magic.context = magic.createContext();
flat.run(tmp); // eval the flattened code
// all this is only profitable if the nested REPL
// does not have a bufferedCommand
if (!magic.bufferedCommand) {
return magic.complete(line, callback);
}
}
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var completions;
// list of completion lists, one for each inheritance "level"
var completionGroups = [];
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var completeOn, match, filter, i, j, group, c;
// REPL commands (e.g. ".break").
var match = null;
match = line.match(/^\s*(\.\w*)$/);
if (match) {
completionGroups.push(Object.keys(this.commands));
completeOn = match[1];
if (match[1].length > 1) {
filter = match[1];
}
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completionGroupsLoaded();
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} else if (match = line.match(requireRE)) {
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// require('...<Tab>')
var exts = Object.keys(require.extensions);
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var indexRe = new RegExp('^index(' + exts.map(regexpEscape).join('|') +
')$');
completeOn = match[1];
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var subdir = match[2] || '';
var filter = match[1];
var dir, files, f, name, base, ext, abs, subfiles, s;
group = [];
var paths = module.paths.concat(require('module').globalPaths);
for (i = 0; i < paths.length; i++) {
dir = path.resolve(paths[i], subdir);
try {
files = fs.readdirSync(dir);
} catch (e) {
continue;
}
for (f = 0; f < files.length; f++) {
name = files[f];
ext = path.extname(name);
base = name.slice(0, -ext.length);
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if (base.match(/-\d+\.\d+(\.\d+)?/) || name === '.npm') {
// Exclude versioned names that 'npm' installs.
continue;
}
if (exts.indexOf(ext) !== -1) {
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if (!subdir || base !== 'index') {
group.push(subdir + base);
}
} else {
abs = path.resolve(dir, name);
try {
if (fs.statSync(abs).isDirectory()) {
group.push(subdir + name + '/');
subfiles = fs.readdirSync(abs);
for (s = 0; s < subfiles.length; s++) {
if (indexRe.test(subfiles[s])) {
group.push(subdir + name);
}
}
}
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} catch (e) {}
}
}
}
if (group.length) {
completionGroups.push(group);
}
if (!subdir) {
completionGroups.push(exports._builtinLibs);
}
completionGroupsLoaded();
// Handle variable member lookup.
// We support simple chained expressions like the following (no function
// calls, etc.). That is for simplicity and also because we *eval* that
// leading expression so for safety (see WARNING above) don't want to
// eval function calls.
//
// foo.bar<|> # completions for 'foo' with filter 'bar'
// spam.eggs.<|> # completions for 'spam.eggs' with filter ''
// foo<|> # all scope vars with filter 'foo'
// foo.<|> # completions for 'foo' with filter ''
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} else if (line.length === 0 || line[line.length - 1].match(/\w|\.|\$/)) {
match = simpleExpressionRE.exec(line);
if (line.length === 0 || match) {
var expr;
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completeOn = (match ? match[0] : '');
if (line.length === 0) {
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filter = '';
expr = '';
} else if (line[line.length - 1] === '.') {
filter = '';
expr = match[0].slice(0, match[0].length - 1);
} else {
var bits = match[0].split('.');
filter = bits.pop();
expr = bits.join('.');
}
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// Resolve expr and get its completions.
var obj, memberGroups = [];
if (!expr) {
// If context is instance of vm.ScriptContext
// Get global vars synchronously
if (this.useGlobal ||
this.context.constructor &&
this.context.constructor.name === 'Context') {
var contextProto = this.context;
while (contextProto = Object.getPrototypeOf(contextProto)) {
completionGroups.push(Object.getOwnPropertyNames(contextProto));
}
completionGroups.push(Object.getOwnPropertyNames(this.context));
addStandardGlobals(completionGroups, filter);
completionGroupsLoaded();
} else {
this.eval('.scope', this.context, 'repl', function(err, globals) {
if (err || !globals) {
addStandardGlobals(completionGroups, filter);
} else if (Array.isArray(globals[0])) {
// Add grouped globals
globals.forEach(function(group) {
completionGroups.push(group);
});
} else {
completionGroups.push(globals);
addStandardGlobals(completionGroups, filter);
}
completionGroupsLoaded();
});
}
} else {
this.eval(expr, this.context, 'repl', function(e, obj) {
// if (e) console.log(e);
if (obj != null) {
if (typeof obj === 'object' || typeof obj === 'function') {
memberGroups.push(Object.getOwnPropertyNames(obj));
}
// works for non-objects
try {
var sentinel = 5;
var p;
if (typeof obj === 'object' || typeof obj === 'function') {
p = Object.getPrototypeOf(obj);
} else {
p = obj.constructor ? obj.constructor.prototype : null;
}
while (p !== null) {
memberGroups.push(Object.getOwnPropertyNames(p));
p = Object.getPrototypeOf(p);
// Circular refs possible? Let's guard against that.
sentinel--;
if (sentinel <= 0) {
break;
}
}
} catch (e) {
//console.log("completion error walking prototype chain:" + e);
}
}
if (memberGroups.length) {
for (i = 0; i < memberGroups.length; i++) {
completionGroups.push(memberGroups[i].map(function(member) {
return expr + '.' + member;
}));
}
if (filter) {
filter = expr + '.' + filter;
}
}
completionGroupsLoaded();
});
}
} else {
completionGroupsLoaded();
}
} else {
completionGroupsLoaded();
}
// Will be called when all completionGroups are in place
// Useful for async autocompletion
function completionGroupsLoaded(err) {
if (err) throw err;
// Filter, sort (within each group), uniq and merge the completion groups.
if (completionGroups.length && filter) {
var newCompletionGroups = [];
for (i = 0; i < completionGroups.length; i++) {
group = completionGroups[i].filter(function(elem) {
return elem.indexOf(filter) == 0;
});
if (group.length) {
newCompletionGroups.push(group);
}
}
completionGroups = newCompletionGroups;
}
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if (completionGroups.length) {
var uniq = {}; // unique completions across all groups
completions = [];
// Completion group 0 is the "closest"
// (least far up the inheritance chain)
// so we put its completions last: to be closest in the REPL.
for (i = completionGroups.length - 1; i >= 0; i--) {
group = completionGroups[i];
group.sort();
for (var j = 0; j < group.length; j++) {
c = group[j];
if (!hasOwnProperty(c)) {
completions.push(c);
uniq[c] = true;
}
}
completions.push(''); // separator btwn groups
}
while (completions.length && completions[completions.length - 1] === '') {
completions.pop();
}
}
callback(null, [completions || [], completeOn]);
}
};
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/**
* Used to parse and execute the Node REPL commands.
*
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* @param {keyword} keyword The command entered to check.
* @return {Boolean} If true it means don't continue parsing the command.
*/
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REPLServer.prototype.parseREPLKeyword = function(keyword, rest) {
var cmd = this.commands[keyword];
if (cmd) {
cmd.action.call(this, rest);
return true;
}
return false;
};
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REPLServer.prototype.defineCommand = function(keyword, cmd) {
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if (typeof cmd === 'function') {
cmd = {action: cmd};
} else if (typeof cmd.action !== 'function') {
throw new Error('bad argument, action must be a function');
}
this.commands['.' + keyword] = cmd;
};
REPLServer.prototype.memory = function memory(cmd) {
var self = this;
self.lines = self.lines || [];
self.lines.level = self.lines.level || [];
// save the line so I can do magic later
if (cmd) {
// TODO should I tab the level?
self.lines.push(new Array(self.lines.level.length).join(' ') + cmd);
} else {
// I don't want to not change the format too much...
self.lines.push('');
}
// I need to know "depth."
// Because I can not tell the difference between a } that
// closes an object literal and a } that closes a function
if (cmd) {
// going down is { and ( e.g. function() {
// going up is } and )
var dw = cmd.match(/{|\(/g);
var up = cmd.match(/}|\)/g);
up = up ? up.length : 0;
dw = dw ? dw.length : 0;
var depth = dw - up;
if (depth) {
(function workIt() {
if (depth > 0) {
// going... down.
// push the line#, depth count, and if the line is a function.
// Since JS only has functional scope I only need to remove
// "function() {" lines, clearly this will not work for
// "function()
// {" but nothing should break, only tab completion for local
// scope will not work for this function.
self.lines.level.push({
line: self.lines.length - 1,
depth: depth,
isFunction: /\s*function\s*/.test(cmd)
});
} else if (depth < 0) {
// going... up.
var curr = self.lines.level.pop();
if (curr) {
var tmp = curr.depth + depth;
if (tmp < 0) {
//more to go, recurse
depth += curr.depth;
workIt();
} else if (tmp > 0) {
//remove and push back
curr.depth += depth;
self.lines.level.push(curr);
}
}
}
}());
}
// it is possible to determine a syntax error at this point.
// if the REPL still has a bufferedCommand and
// self.lines.level.length === 0
// TODO? keep a log of level so that any syntax breaking lines can
// be cleared on .break and in the case of a syntax error?
// TODO? if a log was kept, then I could clear the bufferedComand and
// eval these lines and throw the syntax error
} else {
self.lines.level = [];
}
};
function addStandardGlobals(completionGroups, filter) {
// Global object properties
// (http://www.ecma-international.org/publications/standards/Ecma-262.htm)
completionGroups.push(['NaN', 'Infinity', 'undefined',
'eval', 'parseInt', 'parseFloat', 'isNaN', 'isFinite', 'decodeURI',
'decodeURIComponent', 'encodeURI', 'encodeURIComponent',
'Object', 'Function', 'Array', 'String', 'Boolean', 'Number',
'Date', 'RegExp', 'Error', 'EvalError', 'RangeError',
'ReferenceError', 'SyntaxError', 'TypeError', 'URIError',
'Math', 'JSON']);
// Common keywords. Exclude for completion on the empty string, b/c
// they just get in the way.
if (filter) {
completionGroups.push(['break', 'case', 'catch', 'const',
'continue', 'debugger', 'default', 'delete', 'do', 'else',
'export', 'false', 'finally', 'for', 'function', 'if',
'import', 'in', 'instanceof', 'let', 'new', 'null', 'return',
'switch', 'this', 'throw', 'true', 'try', 'typeof', 'undefined',
'var', 'void', 'while', 'with', 'yield']);
}
}
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function defineDefaultCommands(repl) {
// TODO remove me after 0.3.x
repl.defineCommand('break', {
help: 'Sometimes you get stuck, this gets you out',
action: function() {
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this.bufferedCommand = '';
this.displayPrompt();
}
});
var clearMessage;
if (repl.useGlobal) {
clearMessage = 'Alias for .break';
} else {
clearMessage = 'Break, and also clear the local context';
}
repl.defineCommand('clear', {
help: clearMessage,
action: function() {
this.bufferedCommand = '';
if (!this.useGlobal) {
this.outputStream.write('Clearing context...\n');
this.resetContext();
}
this.displayPrompt();
}
});
repl.defineCommand('exit', {
help: 'Exit the repl',
action: function() {
this.rli.close();
}
});
repl.defineCommand('help', {
help: 'Show repl options',
action: function() {
var self = this;
Object.keys(this.commands).sort().forEach(function(name) {
var cmd = self.commands[name];
self.outputStream.write(name + '\t' + (cmd.help || '') + '\n');
});
this.displayPrompt();
}
});
repl.defineCommand('save', {
help: 'Save all evaluated commands in this REPL session to a file',
action: function(file) {
try {
fs.writeFileSync(file, this.lines.join('\n') + '\n');
this.outputStream.write('Session saved to:' + file + '\n');
} catch (e) {
this.outputStream.write('Failed to save:' + file + '\n');
}
this.displayPrompt();
}
});
repl.defineCommand('load', {
help: 'Load JS from a file into the REPL session',
action: function(file) {
try {
var stats = fs.statSync(file);
if (stats && stats.isFile()) {
var self = this;
var data = fs.readFileSync(file, 'utf8');
var lines = data.split('\n');
this.displayPrompt();
lines.forEach(function(line) {
if (line) {
self.rli.write(line + '\n');
}
});
}
} catch (e) {
this.outputStream.write('Failed to load:' + file + '\n');
}
this.displayPrompt();
}
});
}
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function trimWhitespace(cmd) {
var trimmer = /^\s*(.+)\s*$/m,
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matches = trimmer.exec(cmd);
if (matches && matches.length === 2) {
return matches[1];
}
return '';
}
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function regexpEscape(s) {
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return s.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&');
}
/**
* Converts commands that use var and function <name>() to use the
* local exports.context when evaled. This provides a local context
* on the REPL.
*
* @param {String} cmd The cmd to convert.
* @return {String} The converted command.
*/
REPLServer.prototype.convertToContext = function(cmd) {
var self = this, matches,
scopeVar = /^\s*var\s*([_\w\$]+)(.*)$/m,
scopeFunc = /^\s*function\s*([_\w\$]+)/;
// Replaces: var foo = "bar"; with: self.context.foo = bar;
matches = scopeVar.exec(cmd);
if (matches && matches.length === 3) {
return 'self.context.' + matches[1] + matches[2];
}
// Replaces: function foo() {}; with: foo = function foo() {};
matches = scopeFunc.exec(self.bufferedCommand);
if (matches && matches.length === 2) {
return matches[1] + ' = ' + self.bufferedCommand;
}
return cmd;
};
/**
* Returns `true` if "e" is a SyntaxError, `false` otherwise.
* This function filters out false positives likes JSON.parse() errors and
* RegExp syntax errors.
*/
function isSyntaxError(e) {
// Convert error to string
e = e && (e.stack || e.toString());
return e && e.match(/^SyntaxError/) &&
// RegExp syntax error
!e.match(/^SyntaxError: Invalid regular expression/) &&
!e.match(/^SyntaxError: Invalid flags supplied to RegExp constructor/) &&
// JSON.parse() error
!(e.match(/^SyntaxError: Unexpected (token .*|end of input)/) &&
e.match(/\n at Object.parse \(native\)\n/));
}