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repl.js style
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@ry
ry committed Jan 2, 2011
1 parent 29626d8 commit c82fe30
Showing 1 changed file with 42 additions and 28 deletions.
70 changes: 42 additions & 28 deletions lib/repl.js
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Expand Up @@ -20,20 +20,21 @@
*/

var util = require('util');
var Script = process.binding('evals').Script;
var evalcx = Script.runInContext;
var vm = require('vm');
var path = require('path');
var fs = require('fs');
var rl = require('readline');
var context;

var context;
var disableColors = process.env.NODE_DISABLE_COLORS ? true : false;


// hack for require.resolve("./relative") to work properly.
module.filename = process.cwd() + '/repl';


function resetContext() {
context = Script.createContext();
context = vm.createContext();
for (var i in global) context[i] = global[i];
context.module = module;
context.require = require;
Expand All @@ -43,12 +44,13 @@ function resetContext() {
// Can overridden with custom print functions, such as `probe` or `eyes.js`
exports.writer = util.inspect;


function REPLServer(prompt, stream) {
var self = this;
if (!context) resetContext();
if (!exports.repl) exports.repl = this;
self.context = context;
self.buffered_cmd = '';
self.bufferedCommand = '';

self.stream = stream || process.openStdin();
self.prompt = prompt || '> ';
Expand All @@ -70,9 +72,9 @@ function REPLServer(prompt, stream) {
rli.setPrompt(self.prompt);

rli.on('SIGINT', function() {
if (self.buffered_cmd && self.buffered_cmd.length > 0) {
if (self.bufferedCommand && self.bufferedCommand.length > 0) {
rli.write('\n');
self.buffered_cmd = '';
self.bufferedCommand = '';
self.displayPrompt();
} else {
rli.close();
Expand Down Expand Up @@ -104,7 +106,7 @@ function REPLServer(prompt, stream) {
if (!skipCatchall) {
// The catchall for errors
try {
self.buffered_cmd += cmd + '\n';
self.bufferedCommand += cmd + '\n';
// This try is for determining if the command is complete, or should
// continue onto the next line.
try {
Expand All @@ -117,18 +119,18 @@ function REPLServer(prompt, stream) {
try {
// First we attempt to eval as expression with parens.
// This catches '{a : 1}' properly.
ret = evalcx('(' + self.buffered_cmd + ')', context, 'repl');
ret = vm.runInContext('(' + self.bufferedCommand + ')', context, 'repl');
} catch (e) {
// Now as statement without parens.
ret = evalcx(self.buffered_cmd, context, 'repl');
ret = vm.runInContext(self.bufferedCommand, context, 'repl');
}

if (ret !== undefined) {
context._ = ret;
self.stream.write(exports.writer(ret) + '\n');
}

self.buffered_cmd = '';
self.bufferedCommand = '';
} catch (e) {
// instanceof doesn't work across context switches.
if (!(e && e.constructor && e.constructor.name === 'SyntaxError')) {
Expand All @@ -148,7 +150,7 @@ function REPLServer(prompt, stream) {
} else {
self.stream.write(e.toString() + '\n');
}
self.buffered_cmd = '';
self.bufferedCommand = '';
}
}

Expand All @@ -163,21 +165,30 @@ function REPLServer(prompt, stream) {
}
exports.REPLServer = REPLServer;


// 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) {
return new REPLServer(prompt, source);
};


REPLServer.prototype.displayPrompt = function() {
this.rli.setPrompt(this.buffered_cmd.length ? '... ' : this.prompt);
this.rli.setPrompt(this.bufferedCommand.length ? '... ' : this.prompt);
this.rli.prompt();
};


// read a line from the stream, then eval it
REPLServer.prototype.readline = function(cmd) {
};


var requireRE = /\brequire\s*\(['"](([\w\.\/-]+\/)?([\w\.\/-]*))/;
var simpleExpressionRE =
/(([a-zA-Z_$](?:\w|\$)*)\.)*([a-zA-Z_$](?:\w|\$)*)\.?$/;


// Provide a list of completions for the given leading text. This is
// given to the readline interface for handling tab completion.
//
Expand Down Expand Up @@ -205,8 +216,8 @@ REPLServer.prototype.complete = function(line) {
if (match[1].length > 1) {
filter = match[1];
}
} else if (match =
line.match(/\brequire\s*\(['"](([\w\.\/-]+\/)?([\w\.\/-]*))/)) {

} else if (match = line.match(requireRE)) {
// require('...<Tab>')
//TODO: suggest require.exts be exposed to be introspec registered
//extensions?
Expand Down Expand Up @@ -274,7 +285,6 @@ REPLServer.prototype.complete = function(line) {
'url'];
completionGroups.push(builtinLibs);
}
}

// Handle variable member lookup.
// We support simple chained expressions like the following (no function
Expand All @@ -286,10 +296,8 @@ REPLServer.prototype.complete = function(line) {
// spam.eggs.<|> # completions for 'spam.eggs' with filter ''
// foo<|> # all scope vars with filter 'foo'
// foo.<|> # completions for 'foo' with filter ''
else if (line.length === 0 || line[line.length - 1].match(/\w|\.|\$/)) {
var simpleExpressionPat =
/(([a-zA-Z_$](?:\w|\$)*)\.)*([a-zA-Z_$](?:\w|\$)*)\.?$/;
match = simpleExpressionPat.exec(line);
} else if (line.length === 0 || line[line.length - 1].match(/\w|\.|\$/)) {
match = simpleExpressionRE.exec(line);
if (line.length === 0 || match) {
var expr;
completeOn = (match ? match[0] : '');
Expand Down Expand Up @@ -333,7 +341,7 @@ REPLServer.prototype.complete = function(line) {
}
} else {
try {
obj = evalcx(expr, this.context, 'repl');
obj = vm.runInContext(expr, this.context, 'repl');
} catch (e) {
//console.log("completion eval error, expr='"+expr+"': "+e);
}
Expand Down Expand Up @@ -386,6 +394,7 @@ REPLServer.prototype.complete = function(line) {
}
completionGroups = newCompletionGroups;
}

if (completionGroups.length) {
var uniq = {}; // unique completions across all groups
completions = [];
Expand All @@ -411,13 +420,13 @@ REPLServer.prototype.complete = function(line) {
return [completions || [], completeOn];
};


/**
* Used to parse and execute the Node REPL commands.
*
* @param {keyword} keyword The command entered to check.
* @return {Boolean} If true it means don't continue parsing the command.
*/

REPLServer.prototype.parseREPLKeyword = function(keyword, rest) {
var cmd = this.commands[keyword];
if (cmd) {
Expand All @@ -427,20 +436,23 @@ REPLServer.prototype.parseREPLKeyword = function(keyword, rest) {
return false;
};


REPLServer.prototype.defineCommand = function(keyword, cmd) {
if (typeof cmd === 'function') cmd = {action: cmd};
else if (typeof cmd.action !== 'function') {
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;
};


function defineDefaultCommands(repl) {
// TODO remove me after 0.3.x
repl.defineCommand('break', {
help: 'Sometimes you get stuck, this gets you out',
action: function() {
this.buffered_cmd = '';
this.bufferedCommand = '';
this.displayPrompt();
}
});
Expand All @@ -449,7 +461,7 @@ function defineDefaultCommands(repl) {
help: 'Break, and also clear the local context',
action: function() {
this.stream.write('Clearing context...\n');
this.buffered_cmd = '';
this.bufferedCommand = '';
resetContext();
this.displayPrompt();
}
Expand All @@ -475,6 +487,7 @@ function defineDefaultCommands(repl) {
});
}


function trimWhitespace(cmd) {
var trimmer = /^\s*(.+)\s*$/m,
matches = trimmer.exec(cmd);
Expand All @@ -484,6 +497,7 @@ function trimWhitespace(cmd) {
}
}


function regexpEscape(s) {
return s.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&');
}
Expand All @@ -509,9 +523,9 @@ REPLServer.prototype.convertToContext = function(cmd) {
}

// Replaces: function foo() {}; with: foo = function foo() {};
matches = scopeFunc.exec(self.buffered_cmd);
matches = scopeFunc.exec(self.bufferedCommand);
if (matches && matches.length === 2) {
return matches[1] + ' = ' + self.buffered_cmd;
return matches[1] + ' = ' + self.bufferedCommand;
}

return cmd;
Expand Down

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