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test/unit/fonts_spec.js
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greymoth-jp
Do not drop the character after U+FFFE or U+FFFF in Font.prototype.encodeString
04 июл 2026, 15:37
04 июл 2026, 15:37
2bbf32d
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/* Copyright 2026 Mozilla Foundation * * 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. */ import { Font } from "../../src/core/fonts.js"; import { IdentityToUnicodeMap } from "../../src/core/to_unicode_map.js"; describe("Font", () => { describe("encodeString", () => { // `encodeString` only reads `this.toUnicode` and `this.cMap`, so a // full `Font` (which needs a complete properties/font-file setup) isn't // necessary to exercise it in isolation. function encodeString(str, { cMap = null } = {}) { const fakeFont = { toUnicode: new IdentityToUnicodeMap(0, 0x10ffff), cMap, }; return Font.prototype.encodeString.call(fakeFont, str); } it("should keep the character after U+FFFE or U+FFFF", () => { expect(encodeString("A")).toEqual(["\xffA"]); expect(encodeString("B")).toEqual(["\xfeB"]); }); it("should still treat a real surrogate pair as one code point", () => { // U+1F602 ("😂") is genuinely represented by a surrogate pair; the // character after it must still be kept, and the pair itself must // not be split into its two unpaired halves. expect(encodeString("😂C")).toEqual(["\x02C"]); }); }); });