injector.js
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/*!
* Casper is a navigation utility for PhantomJS.
*
* Documentation: http://n1k0.github.com/casperjs/
* Repository: http://github.com/n1k0/casperjs
*
* Copyright (c) 2011 Nicolas Perriault
*
* 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.
*
*/
(function(phantom) {
/**
* Function argument injector.
*
*/
phantom.Casper.FunctionArgsInjector = function(fn) {
if (!isType(fn, "function")) {
throw "FunctionArgsInjector() can only process functions";
}
this.fn = fn;
this.extract = function(fn) {
var match = /^function\s?(\w+)?\s?\((.*)\)\s?\{([\s\S]*)\}/i.exec(fn.toString().trim());
if (match && match.length > 1) {
var args = match[2].split(',').map(function(arg) {
return arg.replace(new RegExp(/\/\*+.*\*\//ig), "").trim();
}).filter(function(arg) {
return arg;
}) || [];
return {
name: match[1] ? match[1].trim() : null,
args: args,
body: match[3] ? match[3].trim() : ''
};
}
};
this.process = function(values) {
var fnObj = this.extract(this.fn);
if (!isType(fnObj, "object")) {
throw "Unable to process function " + this.fn.toString();
}
var inject = this.getArgsInjectionString(fnObj.args, values);
return 'function ' + (fnObj.name || '') + '(){' + inject + fnObj.body + '}';
};
this.getArgsInjectionString = function(args, values) {
values = typeof values === "object" ? values : {};
var jsonValues = escape(encodeURIComponent(JSON.stringify(values)));
var inject = [
'var __casper_params__ = JSON.parse(decodeURIComponent(unescape(\'' + jsonValues + '\')));'
];
args.forEach(function(arg) {
if (arg in values) {
inject.push('var ' + arg + '=__casper_params__["' + arg + '"];');
}
});
return inject.join('\n') + '\n';
};
};
})(phantom);