fix: keep short composer pastes as text

2026-09-01 18:23:23 +09:00
parent 2bb661f1cf
commit 47dabd8793
4 changed files with 511 additions and 12 deletions
@@ -0,0 +1,121 @@
+import fixtureJson from "../../../tests/fixtures/composer-paste-policy.json" with {
+  type: "json",
+};
+
+import {
+  type ComposerPasteMeasurement,
+  handleComposerPaste,
+  MAX_PLAIN_TEXT_PASTE_CHARS,
+  MAX_PLAIN_TEXT_PASTE_LOGICAL_LINES,
+  measureComposerPaste,
+} from "../src/lib/workspace/console/composer-paste.ts";
+
+declare const Deno: {
+  test(name: string, fn: () => void): void;
+};
+
+function assertEquals(
+  actual: unknown,
+  expected: unknown,
+  message?: string,
+): void {
+  const actualJson = JSON.stringify(actual);
+  const expectedJson = JSON.stringify(expected);
+  if (actualJson !== expectedJson) {
+    throw new Error(
+      `${
+        message ? `${message}: ` : ""
+      }expected ${expectedJson}, got ${actualJson}`,
+    );
+  }
+}
+
+interface FixturePart {
+  value: string;
+  repeat: number;
+}
+
+interface FixtureCase {
+  name: string;
+  parts: FixturePart[];
+  char_count: number;
+  logical_line_count: number;
+  presentation: "text" | "chip";
+}
+
+interface PastePolicyFixture {
+  max_plain_text_chars: number;
+  max_plain_text_logical_lines: number;
+  cases: FixtureCase[];
+}
+
+const fixture = fixtureJson as PastePolicyFixture;
+
+function fixtureContent(testCase: FixtureCase): string {
+  return testCase.parts.map(({ value, repeat }) => value.repeat(repeat)).join(
+    "",
+  );
+}
+
+Deno.test("Browser composer follows the shared paste presentation contract", () => {
+  assertEquals(MAX_PLAIN_TEXT_PASTE_CHARS, fixture.max_plain_text_chars);
+  assertEquals(
+    MAX_PLAIN_TEXT_PASTE_LOGICAL_LINES,
+    fixture.max_plain_text_logical_lines,
+  );
+
+  for (const testCase of fixture.cases) {
+    assertEquals(
+      measureComposerPaste(fixtureContent(testCase)),
+      {
+        charCount: testCase.char_count,
+        logicalLineCount: testCase.logical_line_count,
+        presentation: testCase.presentation,
+      },
+      testCase.name,
+    );
+  }
+});
+
+Deno.test("short paste remains a native Browser edit", () => {
+  let prevented = false;
+  let inserted = 0;
+  const handled = handleComposerPaste(
+    {
+      clipboardData: { getData: () => "replace the selection" },
+      preventDefault: () => {
+        prevented = true;
+      },
+    },
+    () => {
+      inserted += 1;
+    },
+  );
+
+  assertEquals(handled, false);
+  assertEquals(prevented, false);
+  assertEquals(inserted, 0);
+});
+
+Deno.test("chip paste is prevented and routed exactly once", () => {
+  const content = "🦀".repeat(51);
+  let prevented = 0;
+  const inserted: Array<[string, ComposerPasteMeasurement]> = [];
+  const handled = handleComposerPaste(
+    {
+      clipboardData: { getData: () => content },
+      preventDefault: () => {
+        prevented += 1;
+      },
+    },
+    (paste, measurement) => inserted.push([paste, measurement]),
+  );
+
+  assertEquals(handled, true);
+  assertEquals(prevented, 1);
+  assertEquals(inserted, [[content, {
+    charCount: 51,
+    logicalLineCount: 1,
+    presentation: "chip",
+  }]]);
+});