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/**
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @fileOverview A collection of core JavaScript utilities.
*/
/**
* Iterator convenience for JavaScript Objects.
*
* Note that if func returns false, the iteration will be immediately terminated.
* (Returning undefined, or not specifying a return type, does not terminate the iteration).
*
* @example
var pastels = {
red: "#fcc",
green: "#cfc",
blue: "#ccf"
};
eachProperty(pastels, function(key, value) {
print(DIV({style: 'background: '+value+';'}, key));
});
*
* @param {object} obj The object over which to iterate.
* @param {function} func The function to run on each [key,value] pair.
*/
function eachProperty(obj, func) {
var r;
for (k in obj) {
if (!obj.hasOwnProperty || obj.hasOwnProperty(k)) {
r = func(k,obj[k]);
if (r === false) {
break;
}
}
}
}
/**
* Douglas Crockford's "object" function for prototypal inheritance, taken from
* http://javascript.crockford.com/prototypal.html
*
* @param {object} parent The parent object.
* @return {object} A new object whose prototype is parent.
*/
function object(parent) {
function f() {};
f.prototype = parent;
return new f();
}
/**
* Creates an array of the properties of <code>obj</code>,
* <em>not</em> including built-in or inherited properties. If no
* argument is given, applies to the global object.
*
* @example
// Prints "abc"
keys({a: 1, b: 2, c: 3}).forEach(function(k) {
print(k);
}
*
* @example
// Prints all the functions and object members of the global "appjet" object,
// one per line.
print(keys(appjet).join('\n'));
*
* @param {object} obj
*/
function keys(obj) {
var array = [];
var o = obj;
if (o == undefined) {
o = this;
}
for(var k in o) {
if (!obj.hasOwnProperty || o.hasOwnProperty(k)) {
array.push(k);
}
}
return array;
}
/**
* Comparator that returns -1, +1, or 0 depending on whether a < b, or a > b, or
* neither, respectively.
* @param {object} a
* @param {object} b
* @return {number} -1, 0, or +1
*/
function cmp(a,b) {
if (a < b) {
return -1;
}
if (a > b) {
return 1;
}
return 0;
}
function arrayToSet(arr) {
var set = {};
arr.forEach(function(x) {
set[x] = true;
});
return set;
}
function mergeArrays(mergeFunction, a1, a2, etc) {
var len = a1.length;
var arrays = Array.prototype.slice.call(arguments, 1);
for (var i = 0; i < arrays.length; ++i) {
if (arrays[i].length != len) {
return;
}
}
out = [];
for (var i = 0; i < a1.length; ++i) {
out.push(mergeFunction.apply(this, arrays.map(function(array) { return array[i]; })));
}
return out;
}
function debug(obj) {
if (typeof(obj) == 'object') {
var ret = [];
if (obj) {
eachProperty(obj, function(k, v) {
ret.push(k+" -> "+debug(v));
});
return '['+ret.join(", ")+']';
} else {
return String(obj);
}
} else {
return String(obj);
}
}
/**
* Create a scala function out of the given JS function.
*/
function scalaFn(nargs, f) {
if (typeof(f) == 'function') {
return new Packages.scala['Function'+nargs]({
apply: f
});
} else {
return new Packages.scala['Function'+nargs]({
apply: function() { return f; }
})
}
}
function scalaF0(f) {
return scalaFn(0, f);
}
function scalaF1(f) {
return scalaFn(1, f);
}
/**
* Some bonus functions for functional programming.
*/
function f_curry(thisPtr, f, arg1, arg2, etc) {
var curriedArgs = Array.prototype.slice.call(arguments, 2);
return function() {
var args = Array.prototype.slice.call(arguments, 0);
return f.apply(thisPtr, curriedArgs.concat(args));
}
}
function f_limitArgs(thisPtr, f, n) {
return function() {
var args = Array.prototype.slice.call(arguments, 0, n);
return f.apply(thisPtr, args);
}
}
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