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fix(compiler): fix utf8encode, move to sharted utils, add tests (#15076)

This commit is contained in:
Victor Berchet 2017-03-14 17:13:39 -07:00 committed by Chuck Jazdzewski
parent 3b1956bbf2
commit 959a03a61f
4 changed files with 77 additions and 48 deletions
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45
packages/compiler/src/i18n/digest.ts
View File

@ -6,6 +6,8 @@
* found in the LICENSE file at https://angular.io/license
*/
import {utf8Encode} from '../util';
import * as i18n from './i18n_ast';
export function digest(message: i18n.Message): string {
@ -210,49 +212,6 @@ enum Endian {
Big,
}
// TODO(vicb): move this to some shared place, as we also need it
// for SourceMaps.
export function utf8Encode(str: string): string {
let encoded: string = '';
for (let index = 0; index < str.length; index++) {
const codePoint = decodeSurrogatePairs(str, index);
if (codePoint <= 0x7f) {
encoded += String.fromCharCode(codePoint);
} else if (codePoint <= 0x7ff) {
encoded += String.fromCharCode(0xc0 | codePoint >>> 6, 0x80 | codePoint & 0x3f);
} else if (codePoint <= 0xffff) {
encoded += String.fromCharCode(
0xe0 | codePoint >>> 12, 0x80 | codePoint >>> 6 & 0x3f, 0x80 | codePoint & 0x3f);
} else if (codePoint <= 0x1fffff) {
encoded += String.fromCharCode(
0xf0 | codePoint >>> 18, 0x80 | codePoint >>> 12 & 0x3f, 0x80 | codePoint >>> 6 & 0x3f,
0x80 | codePoint & 0x3f);
}
}
return encoded;
}
// see https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
function decodeSurrogatePairs(str: string, index: number): number {
if (index < 0 || index >= str.length) {
throw new Error(`index=${index} is out of range in "${str}"`);
}
const high = str.charCodeAt(index);
if (high >= 0xd800 && high <= 0xdfff && str.length > index + 1) {
const low = byteAt(str, index + 1);
if (low >= 0xdc00 && low <= 0xdfff) {
return (high - 0xd800) * 0x400 + low - 0xdc00 + 0x10000;
}
}
return high;
}
function add32(a: number, b: number): number {
return add32to64(a, b)[1];
}

2
packages/compiler/src/output/source_map.ts
View File

@ -6,7 +6,7 @@
* found in the LICENSE file at https://angular.io/license
*/
import {utf8Encode} from '../i18n/digest';
import {utf8Encode} from '../util';
// https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit
const VERSION = 3;

32
packages/compiler/src/util.ts
View File

@ -98,3 +98,35 @@ const STRING_MAP_PROTO = Object.getPrototypeOf({});
function isStrictStringMap(obj: any): boolean {
return typeof obj === 'object' && obj !== null && Object.getPrototypeOf(obj) === STRING_MAP_PROTO;
}
export function utf8Encode(str: string): string {
let encoded = '';
for (let index = 0; index < str.length; index++) {
let codePoint = str.charCodeAt(index);
// decode surrogate
// see https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
if (codePoint >= 0xd800 && codePoint <= 0xdbff && str.length > (index + 1)) {
const low = str.charCodeAt(index + 1);
if (low >= 0xdc00 && low <= 0xdfff) {
index++;
codePoint = ((codePoint - 0xd800) << 10) + low - 0xdc00 + 0x10000;
}
}
if (codePoint <= 0x7f) {
encoded += String.fromCharCode(codePoint);
} else if (codePoint <= 0x7ff) {
encoded += String.fromCharCode(((codePoint >> 6) & 0x1F) | 0xc0, (codePoint & 0x3f) | 0x80);
} else if (codePoint <= 0xffff) {
encoded += String.fromCharCode(
(codePoint >> 12) | 0xe0, ((codePoint >> 6) & 0x3f) | 0x80, (codePoint & 0x3f) | 0x80);
} else if (codePoint <= 0x1fffff) {
encoded += String.fromCharCode(
((codePoint >> 18) & 0x07) | 0xf0, ((codePoint >> 12) & 0x3f) | 0x80,
((codePoint >> 6) & 0x3f) | 0x80, (codePoint & 0x3f) | 0x80);
}
}
return encoded;
}

44
packages/compiler/test/util_spec.ts
View File

@ -7,9 +7,7 @@
*/
import {fakeAsync} from '@angular/core/testing/src/fake_async';
import {describe, expect, it} from '@angular/core/testing/src/testing_internal';
import {SyncAsyncResult, escapeRegExp, splitAtColon} from '../src/util';
import {SyncAsyncResult, escapeRegExp, splitAtColon, utf8Encode} from '../src/util';
export function main() {
describe('util', () => {
@ -45,5 +43,45 @@ export function main() {
expect(new RegExp(escapeRegExp('a.b')).exec('axb')).toBeFalsy();
});
});
describe('utf8encode', () => {
// tests from https://github.com/mathiasbynens/wtf-8
it('should encode to utf8', () => {
const tests = [
['abc', 'abc'],
// // 1-byte
['\0', '\0'],
// // 2-byte
['\u0080', '\xc2\x80'],
['\u05ca', '\xd7\x8a'],
['\u07ff', '\xdf\xbf'],
// // 3-byte
['\u0800', '\xe0\xa0\x80'],
['\u2c3c', '\xe2\xb0\xbc'],
['\uffff', '\xef\xbf\xbf'],
// //4-byte
['\uD800\uDC00', '\xF0\x90\x80\x80'],
['\uD834\uDF06', '\xF0\x9D\x8C\x86'],
['\uDBFF\uDFFF', '\xF4\x8F\xBF\xBF'],
// unmatched surrogate halves
// high surrogates: 0xD800 to 0xDBFF
['\uD800', '\xED\xA0\x80'],
['\uD800\uD800', '\xED\xA0\x80\xED\xA0\x80'],
['\uD800A', '\xED\xA0\x80A'],
['\uD800\uD834\uDF06\uD800', '\xED\xA0\x80\xF0\x9D\x8C\x86\xED\xA0\x80'],
['\uD9AF', '\xED\xA6\xAF'],
['\uDBFF', '\xED\xAF\xBF'],
// low surrogates: 0xDC00 to 0xDFFF
['\uDC00', '\xED\xB0\x80'],
['\uDC00\uDC00', '\xED\xB0\x80\xED\xB0\x80'],
['\uDC00A', '\xED\xB0\x80A'],
['\uDC00\uD834\uDF06\uDC00', '\xED\xB0\x80\xF0\x9D\x8C\x86\xED\xB0\x80'],
['\uDEEE', '\xED\xBB\xAE'],
['\uDFFF', '\xED\xBF\xBF'],
];
tests.forEach(
([input, output]: [string, string]) => { expect(utf8Encode(input)).toEqual(output); });
});
});
});
}