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autowire.js
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autowire.js
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/** @license MIT License (c) copyright 2010-2013 original author or authors */
/**
* Licensed under the MIT License at:
* http://www.opensource.org/licenses/mit-license.php
*
* @author: Brian Cavalier
* @author: John Hann
*/
(function(define) { 'use strict';
define(function(require) {
var when, meld, paramsRx, splitRx, autowirePlugin;
when = require('when');
meld = require('meld');
paramsRx = /\(([^)]+)/;
splitRx = /\s*,\s*/;
autowirePlugin = {
'configure:before': function(resolver, proxy, wire) {
var p = autowireProperties(wire.resolveRef, {}, proxy).then(function() {
return autowireParameters(wire.resolveRef, {}, proxy)
});
resolver.resolve(p);
}
};
return function() {
return autowirePlugin;
};
function defaultNameMapper(t, p) {
return /^[$]\S+/.test(p) ? p.slice(1) : null;
}
function failIfMissing(e) {
throw e;
}
function noop() {}
function autowireProperties(resolveRef, options, proxy) {
var target, promises, prop, name, mapName, handleMissing;
target = proxy.target;
if(isNode(target)) {
return when.resolve();
}
promises = [];
mapName = options.mapName || defaultNameMapper;
handleMissing = options.fail ? failIfMissing : noop;
for(prop in target) {
name = mapName(target, prop);
if(name) {
promises.push(when.join(prop, resolveRef(name))
.spread(function(prop, val) {
proxy.set(prop, val);
})
.otherwise(handleMissing)
);
}
}
return when.all(promises);
}
function autowireParameters(resolveRef, options, proxy) {
var target, promises, prop;
target = proxy.target;
if(isNode(target)) {
return when.resolve();
}
promises = [];
for(prop in target) {
if (typeof proxy.get(prop) === 'function') {
promises.push(autowireMethodParams(resolveRef, options, proxy, prop));
}
}
return when.all(promises);
}
function autowireMethodParams(resolveRef, options, proxy, methodName) {
var target, method, promise, names, injectedArgs, mapName, handleMissing;
target = proxy.target;
method = proxy.get(methodName);
if(method._advisor) {
method = method._advisor.orig;
}
names = parseParams(method);
mapName = options.mapName || defaultNameMapper;
handleMissing = options.fail ? failIfMissing : noop;
injectedArgs = collectArgs(target, names, mapName, resolveRef, handleMissing);
if(injectedArgs.length) {
promise = when.all(injectedArgs).then(function(injectedArgs) {
injectedArgs = injectedArgs.filter(function(a) { return !!a; });
addParamInjectionAdvice(target, methodName, injectedArgs);
});
}
return promise;
}
function collectArgs(target, names, mapName, resolveRef, handleMissing) {
return names.reduce(function (filtered, name, i) {
var mapped, arg;
mapped = mapName(target, name);
if (mapped) {
arg = { index: i };
filtered.push(resolveRef(mapped).then(function (val) {
arg.value = val;
return arg;
}).otherwise(handleMissing));
}
return filtered;
}, []);
}
function addParamInjectionAdvice(target, methodName, injectedArgs) {
meld.around(target, methodName, function (joinpoint) {
var args = joinpoint.args.slice();
injectedArgs.forEach(function (arg) {
if (arg.index in args) {
args.splice(arg.index, 0, arg.value);
} else {
args[arg.index] = arg.value;
}
});
return joinpoint.proceedApply(args);
});
}
function parseParams(f) {
var args = paramsRx.exec(String(f));
if (args[1]) {
return args[1].split(splitRx);
}
return [];
}
/**
* Returns true if it is a Node
* Adapted from: http://stackoverflow.com/questions/384286/javascript-isdom-how-do-you-check-if-a-javascript-object-is-a-dom-object
* @param it anything
* @return true iff it is a Node
*/
function isNode(it) {
return typeof Node === "object"
? it instanceof Node
: it && typeof it === "object" && typeof it.nodeType === "number" && typeof it.nodeName==="string";
}
});
}(typeof define === 'function' && define.amd ? define : function(factory) { module.exports = factory(require); }));