69 lines
2.4 KiB
TypeScript
69 lines
2.4 KiB
TypeScript
import assert from "node:assert";
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import { describe, it } from "node:test";
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import { TUI } from "../src/tui.ts";
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import { extractSegments, sliceByColumn, visibleWidth } from "../src/utils.ts";
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import { VirtualTerminal } from "./virtual-terminal.ts";
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type TuiComposite = {
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compositeLineAt(
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baseLine: string,
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overlayLine: string,
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startCol: number,
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overlayWidth: number,
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totalWidth: number,
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): string;
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};
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function compositeLineAt(
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baseLine: string,
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overlayLine: string,
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startCol: number,
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overlayWidth: number,
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totalWidth: number,
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): string {
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const tui = new TUI(new VirtualTerminal(totalWidth, 10)) as unknown as TuiComposite;
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return tui.compositeLineAt(baseLine, overlayLine, startCol, overlayWidth, totalWidth);
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}
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describe("overlay CJK boundary regression", () => {
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it("excludes a wide grapheme from before when overlay starts inside it", () => {
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const segments = extractSegments("abcd让EFGH", 5, 9, 11, true);
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assert.strictEqual(segments.before, "abcd");
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assert.strictEqual(segments.beforeWidth, 4);
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assert.strictEqual(visibleWidth(segments.before), segments.beforeWidth);
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assert.strictEqual(segments.after, "H");
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assert.strictEqual(segments.afterWidth, 1);
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});
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it("keeps ASCII before-segment behavior at the same boundary", () => {
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const segments = extractSegments("abcdG EFGH", 5, 9, 11, true);
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assert.strictEqual(segments.before, "abcdG");
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assert.strictEqual(segments.beforeWidth, 5);
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assert.strictEqual(visibleWidth(segments.before), segments.beforeWidth);
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});
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it("composites an overlay at the requested column when it starts inside a wide grapheme", () => {
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const out = compositeLineAt("abcd让EFGH", "│XX│", 5, 4, 20);
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const prefix = sliceByColumn(out, 0, 5, true);
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const overlay = sliceByColumn(out, 5, 4, true);
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assert.strictEqual(out.includes("让"), false);
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assert.strictEqual(visibleWidth(out), 20);
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assert.strictEqual(visibleWidth(prefix), 5);
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assert.strictEqual(visibleWidth(overlay), 4);
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assert.strictEqual(overlay.includes("│XX│"), true);
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});
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it("composites an overlay when it starts at a wide grapheme boundary", () => {
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const out = compositeLineAt("abcd让EFGH", "│XX│", 4, 4, 20);
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const overlay = sliceByColumn(out, 4, 4, true);
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assert.strictEqual(out.includes("让"), false);
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assert.strictEqual(visibleWidth(out), 20);
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assert.strictEqual(visibleWidth(overlay), 4);
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assert.strictEqual(overlay.includes("│XX│"), true);
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});
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});
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