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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
/// <reference types="vitest/globals" />
/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { Assertion, expect } from 'vitest';
import type { TextBuffer } from '../ui/components/shared/text-buffer.js';
// RegExp to detect invalid characters: backspace, and ANSI escape codes
// eslint-disable-next-line no-control-regex
const invalidCharsRegex = /[\b\x1b]/;
function toHaveOnlyValidCharacters(this: Assertion, buffer: TextBuffer) {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const { isNot } = this as any;
let pass = true;
const invalidLines: Array<{ line: number; content: string }> = [];
for (let i = 0; i < buffer.lines.length; i++) {
const line = buffer.lines[i];
if (line.includes('\n')) {
pass = false;
invalidLines.push({ line: i, content: line });
break; // Fail fast on newlines
}
if (invalidCharsRegex.test(line)) {
pass = false;
invalidLines.push({ line: i, content: line });
}
}
return {
pass,
message: () =>
`Expected buffer ${isNot ? 'not ' : ''}to have only valid characters, but found invalid characters in lines:\n${invalidLines
.map((l) => ` [${l.line}]: "${l.content}"`) /* This line was changed */
.join('\n')}`,
actual: buffer.lines,
expected: 'Lines with no line breaks, backspaces, or escape codes.',
};
}
expect.extend({
toHaveOnlyValidCharacters,
// eslint-disable-next-line @typescript-eslint/no-explicit-any
} as any);
// Extend Vitest's `expect` interface with the custom matcher's type definition.
declare module 'vitest' {
interface Assertion<T> {
toHaveOnlyValidCharacters(): T;
}
interface AsymmetricMatchersContaining {
toHaveOnlyValidCharacters(): void;
}
}
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