foam-framework
Version:
MVC metaprogramming framework
102 lines (99 loc) • 3.17 kB
JavaScript
/*
* @license
* Copyright 2015 Google Inc. All Rights Reserved.
*
* 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.
*/
CLASS({
"model_": "Model",
"id": "foam.util.encodings.IncrementalUtf8",
"package": "foam.util.encodings",
"name": "IncrementalUtf8",
"properties": [
{
"model_": "Property",
"name": "charcode",
defaultValue: null
},
{
"model_": "Property",
"name": "remaining",
"defaultValue": 0
},
{
"model_": "Property",
"name": "string"
}
],
"actions": [],
"constants": [],
"messages": [],
"methods": [
{
"model_": "Method",
"name": "reset",
"code": function () {
this.string = '';
this.remaining = 0;
this.charcode = null;
},
"args": []
},
{
"model_": "Method",
"name": "put",
"code": function (byte) {
if ( byte instanceof ArrayBuffer ) {
var data = new Uint8Array(byte);
for ( var i = 0; i < data.length; i++ ) {
this.put(data[i]);
}
return;
}
if (this.charcode == null) {
this.charcode = byte;
if (!(this.charcode & 0x80)) {
this.remaining = 0;
this.charcode = (byte & 0x7f) << (6 * this.remaining);
} else if ((this.charcode & 0xe0) == 0xc0) {
this.remaining = 1;
this.charcode = (byte & 0x1f) << (6 * this.remaining);
} else if ((this.charcode & 0xf0) == 0xe0) {
this.remaining = 2;
this.charcode = (byte & 0x0f) << (6 * this.remaining);
} else if ((this.charcode & 0xf8) == 0xf0) {
this.remaining = 3;
this.charcode = (byte & 0x07) << (6 * this.remaining);
} else if ((this.charcode & 0xfc) == 0xf8) {
this.remaining = 4;
this.charcode = (byte & 0x03) << (6 * this.remaining);
} else if ((this.charcode & 0xfe) == 0xfc) {
this.remaining = 5;
this.charcode = (byte & 0x01) << (6 * this.remaining);
} else throw "Bad charcode value";
} else if ( this.remaining > 0 ) {
this.remaining--;
this.charcode |= (byte & 0x3f) << (6 * this.remaining);
}
if ( this.remaining == 0 ) {
// NOTE: Turns out fromCharCode can't handle all unicode code points.
// We need fromCodePoint from ES 6 before this will work properly.
// However it should be good enough for most cases.
this.string += String.fromCharCode(this.charcode);
this.charcode = undefined;
}
},
"args": []
}
]
});