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| 'use strict';
var _ = require("lodash"),
Type = require("./Type"),
Safe = require("./Safe"),
ChainContext = require("./Chain/ChainContext");
/**
*
* Module internal code
*
* @type {Object}
*
*/
var Internal = {};
/**
*
* Gets the argument list
*
* @param {Object} argsObj
* @return {Array}
*
*/
Internal.getArgumentList = function(argsObj){
var args = [];
_.each(argsObj, function(obj, index){
args.push(obj);
});
return args;
};
/**
*
* Wraps the chainable function
*
* @param {Internal.ChainContext} context
* @param {Function} fn
* @param {Object} chainableFns
* @param {Object} evaluationFns
* @param {Object} options
*
* @return {Function}
*
*/
Internal.wrapChainableFunction = function(context, fn, chainableFns, evaluationFns, options){
options = Safe.object(options);
return function() {
var curContext = context,
args = Internal.getArgumentList(arguments);
/// initialize context if needed
if(!curContext){
curContext = new ChainContext(options);
}
/// add the function to the curContext
curContext.add(fn, args);
/// this is usefull to create "typed" instances of the Chain
var ChainClass = Safe.function(options.type, Chain);
return new ChainClass(chainableFns, evaluationFns, options, curContext);
};
};
/**
*
* Wraps a returnable function. The last argument of the function is always the error, or null
* if doesn't exists.
*
* @param {Internal.ChainContext} context
* @param {Function} fn
* @param {Object} chainableFns
* @param {Object} evaluationFns
* @param {Object} options
*
* @return {Function}
*
*/
Internal.wrapReturnableFunction = function(context, fn, chainableFns, evaluationFns, options){
options = Safe.object(options);
return function() {
var curContext = context,
args = Internal.getArgumentList(arguments);
/// initialize context if needed
if(!curContext){
curContext = new ChainContext(options);
}
var result = null,
err = null;
/// wrap the arguments to .apply call. The last argument should be the one defined
/// on the options.
var _args = [ args.shift() ];
/// sets the scope of the context
var scope = curContext.setScope(options.scope);
try {
/// execute all the chained functions
result = curContext.exec(_args, options.argument);
}
catch(e){
err = e;
}
/// if its on pipe mode, wrap the result so it can be correctly .apply()
if(options.pipe){
result = [ result ];
}
/// create the evaluation function arguments
var fnArgs = Safe.array(result, [ null ])
/// concat the arguments if they are not undefined
.concat(Safe.array(args))
/// concat the argument if is not undefined
.concat(Safe.array(options.argument))
/// concat the err as last argument
.concat([err]);
return fn.apply(scope, fnArgs);
};
};
/**
*
* Get chain functions
*
* @param {Internal.CurrentAssertionContext} assertionContext
* @param {Object} chainableFns
* @param {Object} evaluationFns
* @param {Object} options
*
* @return {Object}
*
*/
Internal.getChainFunctions = function(context, chainableFns, evaluationFns, options){
/// merge the default fns and the custom functions
var fns = _.assign({}, chainableFns);
/// wrap the chainable functions
_.each(
fns,
function(fn, name){
Eif(Type.isFunction(fn)){
fns[name] = Internal.wrapChainableFunction(context, fn, chainableFns, evaluationFns, options);
}
});
/// wrap the returning functions
_.each(
evaluationFns,
function(fn, name){
Eif(Type.isFunction(fn)){
fns[name] = Internal.wrapReturnableFunction(context, fn, chainableFns, evaluationFns, options);
}
});
return fns;
};
/**
*
* Chain constructor
* @class
*
* @param {Object} chainableFns
* @param {Object} evaluationFns
* @param {Object} options
* @param {ChainContext} context
*
* @return {Object}
*
*
* @example
*
* new Chain(
*
* /// chainable fns
* {
* "fn": function(){}
* },
*
* /// evaluation fns
* {},
*
* /// options fns
* {
* type : {},
* pipe : [true|false],
* scope : Function,
* argument : undefined
* },
*
* /// context
* {}
*
* );
*
*
*/
var Chain = function(chainableFns, evaluationFns, options, context){
var scope = this;
/// chain the functions
var fns = Internal.getChainFunctions(context, chainableFns, evaluationFns, options);
/// initialize this context
_.each(fns, function(val, key){
scope[key] = val;
});
};
Chain.prototype = {};
module.exports = Chain;
|