Code coverage report for src/Common/Chain/ChainContext.js

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'use strict';
 
var _    = require("lodash"),
    Safe = require("../Safe"),
    Type = require("../Type"),
 
    ChainFunction   = require("./ChainFunction");
 
 
/**
 *
 * A chain context keeps track of the current chainable state
 * @class
 *
 * @param {Object} options
 *
 * @example
 *
 * new ChainContext({
 *
 *     pipe:
 * })
 */
var ChainContext = function(options){
 
    options = Safe.object(options);
 
    /**
     * The context registered functions
     *
     * @type { [Internal.AssertionFunction] }
     *
     */
    this.fns = [];
 
    /**
     *
     * The shared fn context
     *
     * @type {Object}
     *
     */
    this.scope = this.setScope(options.scope);
 
    /**
     *
     * Pipe mode context
     *
     * @type {Boolean}
     *
     */
    this.pipe = Safe.boolean(options.pipe);
 
};
 
/**
 *
 * Sets the scope of this context.
 *
 * @param  {Object|Function} scope
 * @return {Object}
 */
ChainContext.prototype.setScope = function(scope){
 
    if(Type.isDefined(scope)){
        scope = Type.isFunction(scope) ? scope() : scope;
    }
 
    /// Maintain the current context if not defined
    scope = scope || this.scope;
 
    /// set the context
    this.scope = Safe.object(scope, {});
 
    return this.scope;
 
};
 
/**
 *
 * Chain the given function
 *
 * @param  {Function|Object}   fn
 * @param  {Array}  args
 *
 * @return {Internal.Chain}
 *
 */
ChainContext.prototype.add = function(fn, args){
 
    if(Type.isFunction(fn)) {
 
        fn = new ChainFunction({ fn: fn, args: args });
 
        this.fns.push( fn );
 
    }
 
};
 
/**
 *
 * Execute the context using the given argument as parameter
 *
 * @param  {*}          args
 * @param  {Array}      extraArgs
 * @param  {Funcion}    errCallback
 *
 * @return {*}
 **
 */
ChainContext.prototype.exec = function(args, extraArgs, errCallback){
 
    extraArgs   = Safe.value(extraArgs);
    errCallback = Safe.function(errCallback, function(err){ throw err; });
 
    var self    = this,
        result  = args,
        error   = null;
 
    /// execute the functions
    _.each(
        this.fns,
        function(fn, index){
 
            try {
 
                /// really execute the function
                var value = fn.apply(self.scope, result, extraArgs);
 
                /// if chain return values between the functions
                if(self.pipe) {
                    result = value;
                }
 
            } catch(e){
                error = e;
            }
 
            /// stop iterating
            if(error !== null){
                return false;
            }
 
        });
 
    /// if an error exists
    if(error){
        errCallback(error);
        return null;
    }
 
    /// returns
    return result;
 
};
 
module.exports = ChainContext;