234 lines
7.8 KiB
TypeScript
234 lines
7.8 KiB
TypeScript
import { describe, expect, it } from "vitest";
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import { chunkMarkdownText, chunkText, resolveTextChunkLimit } from "./chunk.js";
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function expectFencesBalanced(chunks: string[]) {
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for (const chunk of chunks) {
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let open: { markerChar: string; markerLen: number } | null = null;
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for (const line of chunk.split("\n")) {
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const match = line.match(/^( {0,3})(`{3,}|~{3,})(.*)$/);
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if (!match) continue;
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const marker = match[2];
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if (!open) {
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open = { markerChar: marker[0], markerLen: marker.length };
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continue;
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}
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if (open.markerChar === marker[0] && marker.length >= open.markerLen) {
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open = null;
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}
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}
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expect(open).toBe(null);
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}
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}
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type ChunkCase = {
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name: string;
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text: string;
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limit: number;
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expected: string[];
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};
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function runChunkCases(chunker: (text: string, limit: number) => string[], cases: ChunkCase[]) {
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for (const { name, text, limit, expected } of cases) {
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it(name, () => {
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expect(chunker(text, limit)).toEqual(expected);
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});
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}
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}
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const parentheticalCases: ChunkCase[] = [
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{
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name: "keeps parenthetical phrases together",
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text: "Heads up now (Though now I'm curious)ok",
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limit: 35,
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expected: ["Heads up now", "(Though now I'm curious)ok"],
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},
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{
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name: "handles nested parentheses",
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text: "Hello (outer (inner) end) world",
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limit: 26,
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expected: ["Hello (outer (inner) end)", "world"],
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},
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{
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name: "ignores unmatched closing parentheses",
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text: "Hello) world (ok)",
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limit: 12,
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expected: ["Hello)", "world (ok)"],
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},
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];
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describe("chunkText", () => {
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it("keeps multi-line text in one chunk when under limit", () => {
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const text = "Line one\n\nLine two\n\nLine three";
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const chunks = chunkText(text, 1600);
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expect(chunks).toEqual([text]);
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});
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it("splits only when text exceeds the limit", () => {
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const part = "a".repeat(20);
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const text = part.repeat(5); // 100 chars
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const chunks = chunkText(text, 60);
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expect(chunks.length).toBe(2);
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expect(chunks[0].length).toBe(60);
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expect(chunks[1].length).toBe(40);
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expect(chunks.join("")).toBe(text);
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});
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it("prefers breaking at a newline before the limit", () => {
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const text = `paragraph one line\n\nparagraph two starts here and continues`;
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const chunks = chunkText(text, 40);
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expect(chunks).toEqual(["paragraph one line", "paragraph two starts here and continues"]);
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});
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it("otherwise breaks at the last whitespace under the limit", () => {
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const text = "This is a message that should break nicely near a word boundary.";
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const chunks = chunkText(text, 30);
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expect(chunks[0].length).toBeLessThanOrEqual(30);
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expect(chunks[1].length).toBeLessThanOrEqual(30);
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expect(chunks.join(" ").replace(/\s+/g, " ").trim()).toBe(text.replace(/\s+/g, " ").trim());
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});
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it("falls back to a hard break when no whitespace is present", () => {
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const text = "Supercalifragilisticexpialidocious"; // 34 chars
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const chunks = chunkText(text, 10);
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expect(chunks).toEqual(["Supercalif", "ragilistic", "expialidoc", "ious"]);
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});
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runChunkCases(chunkText, [parentheticalCases[0]]);
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});
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describe("resolveTextChunkLimit", () => {
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it("uses per-provider defaults", () => {
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expect(resolveTextChunkLimit(undefined, "whatsapp")).toBe(4000);
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expect(resolveTextChunkLimit(undefined, "telegram")).toBe(4000);
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expect(resolveTextChunkLimit(undefined, "slack")).toBe(4000);
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expect(resolveTextChunkLimit(undefined, "signal")).toBe(4000);
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expect(resolveTextChunkLimit(undefined, "imessage")).toBe(4000);
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expect(resolveTextChunkLimit(undefined, "discord")).toBe(4000);
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expect(
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resolveTextChunkLimit(undefined, "discord", undefined, {
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fallbackLimit: 2000,
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}),
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).toBe(2000);
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});
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it("supports provider overrides", () => {
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const cfg = { channels: { telegram: { textChunkLimit: 1234 } } };
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expect(resolveTextChunkLimit(cfg, "whatsapp")).toBe(4000);
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expect(resolveTextChunkLimit(cfg, "telegram")).toBe(1234);
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});
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it("prefers account overrides when provided", () => {
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const cfg = {
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channels: {
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telegram: {
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textChunkLimit: 2000,
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accounts: {
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default: { textChunkLimit: 1234 },
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primary: { textChunkLimit: 777 },
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},
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},
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},
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};
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expect(resolveTextChunkLimit(cfg, "telegram", "primary")).toBe(777);
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expect(resolveTextChunkLimit(cfg, "telegram", "default")).toBe(1234);
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});
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it("uses the matching provider override", () => {
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const cfg = {
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channels: {
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discord: { textChunkLimit: 111 },
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slack: { textChunkLimit: 222 },
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},
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};
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expect(resolveTextChunkLimit(cfg, "discord")).toBe(111);
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expect(resolveTextChunkLimit(cfg, "slack")).toBe(222);
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expect(resolveTextChunkLimit(cfg, "telegram")).toBe(4000);
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});
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});
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describe("chunkMarkdownText", () => {
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it("keeps fenced blocks intact when a safe break exists", () => {
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const prefix = "p".repeat(60);
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const fence = "```bash\nline1\nline2\n```";
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const suffix = "s".repeat(60);
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const text = `${prefix}\n\n${fence}\n\n${suffix}`;
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const chunks = chunkMarkdownText(text, 40);
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expect(chunks.some((chunk) => chunk.trimEnd() === fence)).toBe(true);
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expectFencesBalanced(chunks);
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});
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it("reopens fenced blocks when forced to split inside them", () => {
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const text = `\`\`\`txt\n${"a".repeat(500)}\n\`\`\``;
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const limit = 120;
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const chunks = chunkMarkdownText(text, limit);
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expect(chunks.length).toBeGreaterThan(1);
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for (const chunk of chunks) {
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expect(chunk.length).toBeLessThanOrEqual(limit);
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expect(chunk.startsWith("```txt\n")).toBe(true);
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expect(chunk.trimEnd().endsWith("```")).toBe(true);
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}
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expectFencesBalanced(chunks);
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});
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it("supports tilde fences", () => {
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const text = `~~~sh\n${"x".repeat(600)}\n~~~`;
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const limit = 140;
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const chunks = chunkMarkdownText(text, limit);
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expect(chunks.length).toBeGreaterThan(1);
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for (const chunk of chunks) {
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expect(chunk.length).toBeLessThanOrEqual(limit);
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expect(chunk.startsWith("~~~sh\n")).toBe(true);
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expect(chunk.trimEnd().endsWith("~~~")).toBe(true);
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}
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expectFencesBalanced(chunks);
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});
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it("supports longer fence markers for close", () => {
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const text = `\`\`\`\`md\n${"y".repeat(600)}\n\`\`\`\``;
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const limit = 140;
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const chunks = chunkMarkdownText(text, limit);
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expect(chunks.length).toBeGreaterThan(1);
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for (const chunk of chunks) {
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expect(chunk.length).toBeLessThanOrEqual(limit);
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expect(chunk.startsWith("````md\n")).toBe(true);
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expect(chunk.trimEnd().endsWith("````")).toBe(true);
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}
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expectFencesBalanced(chunks);
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});
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it("preserves indentation for indented fences", () => {
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const text = ` \`\`\`js\n ${"z".repeat(600)}\n \`\`\``;
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const limit = 160;
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const chunks = chunkMarkdownText(text, limit);
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expect(chunks.length).toBeGreaterThan(1);
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for (const chunk of chunks) {
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expect(chunk.length).toBeLessThanOrEqual(limit);
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expect(chunk.startsWith(" ```js\n")).toBe(true);
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expect(chunk.trimEnd().endsWith(" ```")).toBe(true);
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}
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expectFencesBalanced(chunks);
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});
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it("never produces an empty fenced chunk when splitting", () => {
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const text = `\`\`\`txt\n${"a".repeat(300)}\n\`\`\``;
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const chunks = chunkMarkdownText(text, 60);
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for (const chunk of chunks) {
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const nonFenceLines = chunk
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.split("\n")
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.filter((line) => !/^( {0,3})(`{3,}|~{3,})(.*)$/.test(line));
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expect(nonFenceLines.join("\n").trim()).not.toBe("");
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}
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});
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runChunkCases(chunkMarkdownText, parentheticalCases);
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it("hard-breaks when a parenthetical exceeds the limit", () => {
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const text = `(${"a".repeat(80)})`;
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const chunks = chunkMarkdownText(text, 20);
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expect(chunks[0]?.length).toBe(20);
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expect(chunks.join("")).toBe(text);
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});
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});
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