repl.js style
This commit is contained in:
Ryan Dahl
parent
29626d8731
commit
c82fe30ca1
70
lib/repl.js
70
lib/repl.js
@ -20,20 +20,21 @@
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*/
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var util = require('util');
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var Script = process.binding('evals').Script;
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var evalcx = Script.runInContext;
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var vm = require('vm');
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var path = require('path');
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var fs = require('fs');
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var rl = require('readline');
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var context;
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var context;
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var disableColors = process.env.NODE_DISABLE_COLORS ? true : false;
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// hack for require.resolve("./relative") to work properly.
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module.filename = process.cwd() + '/repl';
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function resetContext() {
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context = Script.createContext();
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context = vm.createContext();
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for (var i in global) context[i] = global[i];
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context.module = module;
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context.require = require;
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@ -43,12 +44,13 @@ function resetContext() {
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// Can overridden with custom print functions, such as `probe` or `eyes.js`
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exports.writer = util.inspect;
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function REPLServer(prompt, stream) {
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var self = this;
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if (!context) resetContext();
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if (!exports.repl) exports.repl = this;
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self.context = context;
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self.buffered_cmd = '';
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self.bufferedCommand = '';
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self.stream = stream || process.openStdin();
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self.prompt = prompt || '> ';
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@ -70,9 +72,9 @@ function REPLServer(prompt, stream) {
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rli.setPrompt(self.prompt);
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rli.on('SIGINT', function() {
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if (self.buffered_cmd && self.buffered_cmd.length > 0) {
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if (self.bufferedCommand && self.bufferedCommand.length > 0) {
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rli.write('\n');
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self.buffered_cmd = '';
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self.bufferedCommand = '';
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self.displayPrompt();
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} else {
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rli.close();
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@ -104,7 +106,7 @@ function REPLServer(prompt, stream) {
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if (!skipCatchall) {
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// The catchall for errors
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try {
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self.buffered_cmd += cmd + '\n';
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self.bufferedCommand += cmd + '\n';
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// This try is for determining if the command is complete, or should
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// continue onto the next line.
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try {
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@ -117,10 +119,10 @@ function REPLServer(prompt, stream) {
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try {
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// First we attempt to eval as expression with parens.
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// This catches '{a : 1}' properly.
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ret = evalcx('(' + self.buffered_cmd + ')', context, 'repl');
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ret = vm.runInContext('(' + self.bufferedCommand + ')', context, 'repl');
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} catch (e) {
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// Now as statement without parens.
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ret = evalcx(self.buffered_cmd, context, 'repl');
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ret = vm.runInContext(self.bufferedCommand, context, 'repl');
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}
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if (ret !== undefined) {
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@ -128,7 +130,7 @@ function REPLServer(prompt, stream) {
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self.stream.write(exports.writer(ret) + '\n');
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}
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self.buffered_cmd = '';
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self.bufferedCommand = '';
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} catch (e) {
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// instanceof doesn't work across context switches.
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if (!(e && e.constructor && e.constructor.name === 'SyntaxError')) {
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@ -148,7 +150,7 @@ function REPLServer(prompt, stream) {
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} else {
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self.stream.write(e.toString() + '\n');
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}
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self.buffered_cmd = '';
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self.bufferedCommand = '';
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}
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}
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@ -163,21 +165,30 @@ function REPLServer(prompt, stream) {
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}
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exports.REPLServer = REPLServer;
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// prompt is a string to print on each line for the prompt,
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// source is a stream to use for I/O, defaulting to stdin/stdout.
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exports.start = function(prompt, source) {
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return new REPLServer(prompt, source);
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};
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REPLServer.prototype.displayPrompt = function() {
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this.rli.setPrompt(this.buffered_cmd.length ? '... ' : this.prompt);
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this.rli.setPrompt(this.bufferedCommand.length ? '... ' : this.prompt);
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this.rli.prompt();
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};
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// read a line from the stream, then eval it
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REPLServer.prototype.readline = function(cmd) {
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};
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var requireRE = /\brequire\s*\(['"](([\w\.\/-]+\/)?([\w\.\/-]*))/;
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var simpleExpressionRE =
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/(([a-zA-Z_$](?:\w|\$)*)\.)*([a-zA-Z_$](?:\w|\$)*)\.?$/;
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// Provide a list of completions for the given leading text. This is
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// given to the readline interface for handling tab completion.
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//
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@ -205,8 +216,8 @@ REPLServer.prototype.complete = function(line) {
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if (match[1].length > 1) {
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filter = match[1];
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}
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} else if (match =
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line.match(/\brequire\s*\(['"](([\w\.\/-]+\/)?([\w\.\/-]*))/)) {
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} else if (match = line.match(requireRE)) {
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// require('...<Tab>')
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//TODO: suggest require.exts be exposed to be introspec registered
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//extensions?
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@ -274,7 +285,6 @@ REPLServer.prototype.complete = function(line) {
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'url'];
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completionGroups.push(builtinLibs);
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}
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}
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// Handle variable member lookup.
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// We support simple chained expressions like the following (no function
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@ -286,10 +296,8 @@ REPLServer.prototype.complete = function(line) {
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// spam.eggs.<|> # completions for 'spam.eggs' with filter ''
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// foo<|> # all scope vars with filter 'foo'
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// foo.<|> # completions for 'foo' with filter ''
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else if (line.length === 0 || line[line.length - 1].match(/\w|\.|\$/)) {
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var simpleExpressionPat =
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/(([a-zA-Z_$](?:\w|\$)*)\.)*([a-zA-Z_$](?:\w|\$)*)\.?$/;
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match = simpleExpressionPat.exec(line);
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} else if (line.length === 0 || line[line.length - 1].match(/\w|\.|\$/)) {
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match = simpleExpressionRE.exec(line);
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if (line.length === 0 || match) {
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var expr;
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completeOn = (match ? match[0] : '');
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@ -333,7 +341,7 @@ REPLServer.prototype.complete = function(line) {
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}
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} else {
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try {
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obj = evalcx(expr, this.context, 'repl');
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obj = vm.runInContext(expr, this.context, 'repl');
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} catch (e) {
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//console.log("completion eval error, expr='"+expr+"': "+e);
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}
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@ -386,6 +394,7 @@ REPLServer.prototype.complete = function(line) {
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}
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completionGroups = newCompletionGroups;
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}
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if (completionGroups.length) {
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var uniq = {}; // unique completions across all groups
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completions = [];
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@ -411,13 +420,13 @@ REPLServer.prototype.complete = function(line) {
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return [completions || [], completeOn];
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};
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/**
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* Used to parse and execute the Node REPL commands.
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*
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* @param {keyword} keyword The command entered to check.
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* @return {Boolean} If true it means don't continue parsing the command.
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*/
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REPLServer.prototype.parseREPLKeyword = function(keyword, rest) {
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var cmd = this.commands[keyword];
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if (cmd) {
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@ -427,20 +436,23 @@ REPLServer.prototype.parseREPLKeyword = function(keyword, rest) {
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return false;
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};
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REPLServer.prototype.defineCommand = function(keyword, cmd) {
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if (typeof cmd === 'function') cmd = {action: cmd};
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else if (typeof cmd.action !== 'function') {
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if (typeof cmd === 'function') {
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cmd = {action: cmd};
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} else if (typeof cmd.action !== 'function') {
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throw new Error('bad argument, action must be a function');
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}
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this.commands['.' + keyword] = cmd;
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};
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function defineDefaultCommands(repl) {
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// TODO remove me after 0.3.x
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repl.defineCommand('break', {
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help: 'Sometimes you get stuck, this gets you out',
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action: function() {
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this.buffered_cmd = '';
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this.bufferedCommand = '';
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this.displayPrompt();
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}
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});
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@ -449,7 +461,7 @@ function defineDefaultCommands(repl) {
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help: 'Break, and also clear the local context',
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action: function() {
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this.stream.write('Clearing context...\n');
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this.buffered_cmd = '';
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this.bufferedCommand = '';
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resetContext();
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this.displayPrompt();
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}
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@ -475,6 +487,7 @@ function defineDefaultCommands(repl) {
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});
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}
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function trimWhitespace(cmd) {
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var trimmer = /^\s*(.+)\s*$/m,
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matches = trimmer.exec(cmd);
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@ -484,6 +497,7 @@ function trimWhitespace(cmd) {
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}
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}
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function regexpEscape(s) {
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return s.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&');
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}
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@ -509,9 +523,9 @@ REPLServer.prototype.convertToContext = function(cmd) {
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}
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// Replaces: function foo() {}; with: foo = function foo() {};
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matches = scopeFunc.exec(self.buffered_cmd);
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matches = scopeFunc.exec(self.bufferedCommand);
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if (matches && matches.length === 2) {
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return matches[1] + ' = ' + self.buffered_cmd;
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return matches[1] + ' = ' + self.bufferedCommand;
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}
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return cmd;
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