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nexpect.js
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nexpect.js
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/*
* nexpect.js: Top-level include for the `nexpect` module.
*
* (C) 2011, Elijah Insua, Marak Squires, Charlie Robbins.
*
*/
var spawn = require('child_process').spawn;
function chain (context) {
return {
expect: function (str) {
var _expect = function _expect (data) {
return data.indexOf(str) > -1;
};
_expect.shift = true;
context.queue.push(_expect);
return chain(context);
},
sendline: function (line) {
var _sendline = function _sendline () {
context.process.stdin.write(line + '\n');
};
_sendline.shift = true;
context.queue.push(_sendline);
return chain(context);
},
wait: function (str) {
var _wait = function _wait (data) {
return data.indexOf(str) > -1;
};
_wait.shift = false;
context.queue.push(_wait);
return chain(context);
},
run: function (callback) {
var errState = null,
responded = false,
stdout = [];
function onError (err, kill) {
if (errState || responded) {
return;
}
errState = err;
responded = true;
if (kill) {
try { context.process.kill() }
catch (ex) { }
}
callback(err);
}
function evalContext (data, name) {
var currentFn = context.queue[0];
if (!currentFn || (name === '_expect' && currentFn.name === '_expect')) {
//
// If there is nothing left on the context or we are trying to
// evaluate two consecutive `_expect` functions, return.
//
return;
}
if (currentFn.shift) {
context.queue.shift();
}
if (typeof currentFn !== 'function') {
//
// If the `currentFn` is not a function, short-circuit with an error.
//
return onError(new Error('Cannot process non-function on nexpect stack.'), true);
}
else if (['_expect', '_sendline', '_wait'].indexOf(currentFn.name) === -1) {
//
// If the `currentFn` is a function, but not those set by `.sendline()` or
// `.expect()` then short-circuit with an error.
//
return onError(new Error('Unexpected context function name: ' + currentFn.name), true);
}
if (currentFn.name === '_expect') {
//
// If this is an `_expect` function, then evaluate it and attempt
// to evaluate the next function (in case it is a `_sendline` function).
//
return currentFn(data) === true
? evalContext(data, '_expect')
: onError(new Error(data + ' was not expected..'), true);
}
else if (currentFn.name === '_wait') {
//
// If this is a `_wait` function, then evaluate it and if it returns true,
// then evaluate the function (in case it is a `_sendline` function).
//
if (currentFn(data) === true) {
context.queue.shift();
evalContext(data, '_expect');
}
}
else if (currentFn.name === '_sendline') {
//
// If the `currentFn` is a `_sendline` function then evaluate
// it and return.
//
currentFn();
}
}
function onLine (data) {
data = data.toString();
if (context.verbose) {
process.stdout.write(data);
}
if (context.stripColors) {
data = data.replace(/\u001b\[\d{0,2}m/g, '');
}
if (context.ignoreCase) {
data = data.toLowerCase();
}
stdout = stdout.concat(data.split('\n').filter(function (line) { line !== '' }));
evalContext(data, null);
};
context.process = spawn(context.command, context.params);
context.process.stdout.on('data', onLine);
context.process.on('exit', function (code, signal) {
if (code === 127) {
//
// If the response code is `127` then `context.command` was not found.
//
return onError(new Error('Command not found: ' + context.command));
}
callback(null, stdout);
});
return context.process;
}
};
};
function nspawn (command, params, options) {
if (arguments.length === 2) {
if (Array.isArray(arguments[1])) {
params = arguments[1];
options = {};
}
else {
params = [];
options = arguments[1];
}
}
if (Array.isArray(command)) {
params = command;
command = params.shift();
}
else if (typeof command === 'string') {
command = command.split(' ');
params = params || command.slice(1);
command = command[0];
}
options = options || {};
context = {
command: command,
params: params,
queue: [],
verbose: options.verbose,
stripColors: options.stripColors,
ignoreCase: options.ignoreCase
};
return chain(context);
};
//
// Export the core `nspawn` function as well as `nexpect.nspawn` for
// backwards compatibility.
//
module.exports.spawn = nspawn;
module.exports.nspawn = {
spawn: nspawn
};