alexion
4def357d09
Imported as a linear vendor commit so forge rebases do not replay the upstream root tree. git-subtree-dir: third_party/pi git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477
47 lines
1.9 KiB
TypeScript
47 lines
1.9 KiB
TypeScript
import assert from "node:assert";
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import { describe, it } from "node:test";
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import { compositeTuiLine } from "../src/tui.ts";
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import { extractSegments, sliceByColumn, visibleWidth } from "../src/utils.ts";
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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 = compositeTuiLine("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 = compositeTuiLine("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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