apple2js/js/util.js
2017-09-22 21:42:57 -07:00

113 lines
2.6 KiB
JavaScript

/* Copyright 2010-2016 Will Scullin <scullin@scullinsteel.com>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
/*eslint no-console: 0*/
/*exported allocMemPages, bytify, debug, each, gup, hup, toBinary, toHex
*/
/*global Uint8Array: false */
if (!Date.now) {
Date.now = function now() {
return new Date().getTime();
};
}
var hex_digits = '0123456789ABCDEF';
var bin_digits = '01';
function allocMem(size) {
var result;
if (window.Uint8Array) {
result = new Uint8Array(size);
} else {
result = new Array(size);
}
for (var idx = 0; idx < size; idx++) {
result[idx] = (idx & 0x02) ? 0x00 : 0xff;
}
return result;
}
function allocMemPages(pages) {
return allocMem(pages * 0x100);
}
function bytify(ary) {
var result = ary;
if (window.Uint8Array) {
result = new Uint8Array(ary);
}
return result;
}
function debug() {
if (typeof console != 'undefined' && 'log' in console) {
console.log.apply(console, arguments);
}
}
function toHex(v, n) {
if (!n) {
n = v < 256 ? 2 : 4;
}
var result = '';
for (var idx = 0; idx < n; idx++) {
result = hex_digits[v & 0x0f] + result;
v >>= 4;
}
return result;
}
function toBinary(v) {
var result = '';
for (var idx = 0; idx < 8; idx++) {
result = bin_digits[v & 0x01] + result;
v >>= 1;
}
return result;
}
// From http://www.netlobo.com/url_query_string_javascript.html
function gup( name )
{
name = name.replace(/[\[]/,'\\[').replace(/[\]]/,'\\]');
var regexS = '[\\?&]'+name+'=([^&#]*)';
var regex = new RegExp( regexS );
var results = regex.exec( window.location.href );
if( !results )
return '';
else
return results[1];
}
function hup() {
var regex = new RegExp('#(.*)');
var results = regex.exec(window.location.hash);
if ( !results )
return '';
else
return results[1];
}
function keys(obj) {
var result = [];
for (var key in obj) {
if (obj.hasOwnProperty(key)) {
result.push(key);
}
}
return result;
}
function each(obj, fn) {
keys(obj).forEach(fn);
}