fix(canvas): 小说导入 - 增强 TXT 分章与编码识别 (#28)

web/test/canvas-document.test.ts

@@ -0,0 +1,48 @@
+import { describe, expect, test } from "bun:test";
+import { decodeNovelText, splitTextIntoChapters } from "../src/lib/canvas/canvas-document";
+
+describe("splitTextIntoChapters", () => {
+    test("识别常见中文、Markdown、装饰符与英文标题", () => {
+        const chapters = splitTextIntoChapters(`书名与作者
+
+第 1 章 初入江湖
+第一章正文
+
+＃ 第２章 风雨欲来
+第二章正文
+
+【第三章】再会故人
+第三章正文
+
+卷四 山河故人
+第四章正文
+
+Epilogue: 重逢
+尾声正文`);
+
+        expect(chapters.map((chapter) => chapter.title)).toEqual(["序章", "第 1 章 初入江湖", "第２章 风雨欲来", "【第三章】再会故人", "卷四 山河故人", "Epilogue: 重逢"]);
+        expect(chapters[0].plainText).toBe("书名与作者");
+        expect(chapters[2].plainText).toBe("第二章正文");
+    });
+
+    test("普通正文和未识别文本保持为单个章节", () => {
+        const text = "这是第一章中发生的故事。\n角色继续前行。";
+        const chapters = splitTextIntoChapters(text);
+
+        expect(chapters).toHaveLength(1);
+        expect(chapters[0].title).toBe("第 1 章");
+        expect(chapters[0].plainText).toBe(text);
+    });
+});
+
+describe("decodeNovelText", () => {
+    test("解码带 BOM 的 UTF-16LE", () => {
+        const bytes = new Uint8Array([0xff, 0xfe, 0x2c, 0x7b, 0x00, 0x4e, 0xe0, 0x7a]);
+        expect(decodeNovelText(bytes.buffer)).toBe("第一章");
+    });
+
+    test("UTF-8 严格解码失败后回退到 GB18030", () => {
+        const bytes = new Uint8Array([0xb5, 0xda, 0xd2, 0xbb, 0xd5, 0xc2, 0x0a, 0xd5, 0xfd, 0xce, 0xc4]);
+        expect(decodeNovelText(bytes.buffer)).toBe("第一章\n正文");
+    });
+});