forerunnerdb
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A NoSQL document store database for browsers and Node.js.
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<h1 class="page-title">Source: Overload.js</h1>
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<pre class="prettyprint source linenums"><code>"use strict";
/**
* Allows a method to accept overloaded calls with different parameters controlling
* which passed overload function is called.
* @param {Object} def
* @returns {Function}
* @constructor
*/
var Overload = function (def) {
if (def) {
var self = this,
index,
count,
tmpDef,
defNewKey,
sigIndex,
signatures;
if (!(def instanceof Array)) {
tmpDef = {};
// Def is an object, make sure all prop names are devoid of spaces
for (index in def) {
if (def.hasOwnProperty(index)) {
defNewKey = index.replace(/ /g, '');
// Check if the definition array has a * string in it
if (defNewKey.indexOf('*') === -1) {
// No * found
tmpDef[defNewKey] = def[index];
} else {
// A * was found, generate the different signatures that this
// definition could represent
signatures = this.generateSignaturePermutations(defNewKey);
for (sigIndex = 0; sigIndex < signatures.length; sigIndex++) {
if (!tmpDef[signatures[sigIndex]]) {
tmpDef[signatures[sigIndex]] = def[index];
}
}
}
}
}
def = tmpDef;
}
return function () {
var arr = [],
lookup,
type,
name;
// Check if we are being passed a key/function object or an array of functions
if (def instanceof Array) {
// We were passed an array of functions
count = def.length;
for (index = 0; index < count; index++) {
if (def[index].length === arguments.length) {
return self.callExtend(this, '$main', def, def[index], arguments);
}
}
} else {
// Generate lookup key from arguments
// Copy arguments to an array
for (index = 0; index < arguments.length; index++) {
type = typeof arguments[index];
// Handle detecting arrays
if (type === 'object' && arguments[index] instanceof Array) {
type = 'array';
}
// Handle been presented with a single undefined argument
if (arguments.length === 1 && type === 'undefined') {
break;
}
// Add the type to the argument types array
arr.push(type);
}
lookup = arr.join(',');
// Check for an exact lookup match
if (def[lookup]) {
return self.callExtend(this, '$main', def, def[lookup], arguments);
} else {
for (index = arr.length; index >= 0; index--) {
// Get the closest match
lookup = arr.slice(0, index).join(',');
if (def[lookup + ',...']) {
// Matched against arguments + "any other"
return self.callExtend(this, '$main', def, def[lookup + ',...'], arguments);
}
}
}
}
name = typeof this.name === 'function' ? this.name() : 'Unknown';
throw('ForerunnerDB.Overload "' + name + '": Overloaded method does not have a matching signature for the passed arguments: ' + this.jStringify(arr));
};
}
return function () {};
};
/**
* Generates an array of all the different definition signatures that can be
* created from the passed string with a catch-all wildcard *. E.g. it will
* convert the signature: string,*,string to all potentials:
* string,string,string
* string,number,string
* string,object,string,
* string,function,string,
* string,undefined,string
*
* @param {String} str Signature string with a wildcard in it.
* @returns {Array} An array of signature strings that are generated.
*/
Overload.prototype.generateSignaturePermutations = function (str) {
var signatures = [],
newSignature,
types = ['string', 'object', 'number', 'function', 'undefined'],
index;
if (str.indexOf('*') > -1) {
// There is at least one "any" type, break out into multiple keys
// We could do this at query time with regular expressions but
// would be significantly slower
for (index = 0; index < types.length; index++) {
newSignature = str.replace('*', types[index]);
signatures = signatures.concat(this.generateSignaturePermutations(newSignature));
}
} else {
signatures.push(str);
}
return signatures;
};
Overload.prototype.callExtend = function (context, prop, propContext, func, args) {
var tmp,
ret;
if (context && propContext[prop]) {
tmp = context[prop];
context[prop] = propContext[prop];
ret = func.apply(context, args);
context[prop] = tmp;
return ret;
} else {
return func.apply(context, args);
}
};
module.exports = Overload;</code></pre>
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