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rewriting-stream.test.ts
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rewriting-stream.test.ts
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import * as assert from 'node:assert';
import { outdent } from 'outdent';
import { RewritingStream } from '../lib/index.js';
import { loadSAXParserTestData } from 'parse5-test-utils/utils/load-sax-parser-test-data.js';
import { getStringDiffMsg, writeChunkedToStream, WritableStreamStub } from 'parse5-test-utils/utils/common.js';
import { finished } from 'node:stream';
const srcHtml = outdent`
<!DOCTYPE html "">
<html>
<!-- comment1 -->
<head /// 123>
</head>
<!-- comment2 -->
<body =123>
<div>Hey ya</div>
</body>
</html>
`;
const LONG_TEXT = 'a'.repeat((1 << 16) + 1);
const LONG_TEXT_WITH_COMMENT = `${'a'.repeat((1 << 16) - 5)}<!-- comment -->`;
function createRewriterTest({
src,
expected,
assignTokenHandlers = (): void => {
/* Ignore */
},
}: {
src: string;
expected: string;
assignTokenHandlers?: (rewriter: RewritingStream) => void;
}) {
return (done: (err?: unknown) => void): void => {
const rewriter = new RewritingStream();
const writable = new WritableStreamStub();
finished(writable, () => {
try {
assert.ok(writable.writtenData === expected, getStringDiffMsg(writable.writtenData, expected));
done();
} catch (error) {
done(error);
}
});
rewriter.pipe(writable);
assignTokenHandlers(rewriter);
writeChunkedToStream(src, rewriter);
};
}
describe('RewritingStream', () => {
// Raw data tests
for (const [idx, data] of loadSAXParserTestData().entries()) {
// NOTE: if we don't have any event handlers assigned, stream should use raw
// data for the serialization, so serialized content should identical to the original.
it(
`Raw token serialization - ${idx + 1}.${data.name}`,
createRewriterTest({
src: data.src,
expected: data.src,
})
);
}
it(
'rewrite start tags',
createRewriterTest({
src: srcHtml,
expected: outdent`
<!DOCTYPE html "">
<html>
<!-- comment1 -->
<body 123="">
</head>
<!-- comment2 -->
<head =123="">
<div>Hey ya</div>
</body>
</html>
`,
assignTokenHandlers: (rewriter) => {
rewriter.on('startTag', (token) => {
if (token.tagName === 'head') {
token.tagName = 'body';
} else if (token.tagName === 'body') {
token.tagName = 'head';
}
rewriter.emitStartTag(token);
});
},
})
);
it(
'rewrite end tags',
createRewriterTest({
src: srcHtml,
expected: outdent`
<!DOCTYPE html "">
<html>
<!-- comment1 -->
<head /// 123>
</rewritten>
<!-- comment2 -->
<body =123>
<div>Hey ya</rewritten>
</rewritten>
</rewritten>
`,
assignTokenHandlers: (rewriter) => {
rewriter.on('endTag', (token) => {
token.tagName = 'rewritten';
rewriter.emitEndTag(token);
});
},
})
);
it(
'rewrite text',
createRewriterTest({
src: srcHtml,
expected: outdent`
<!DOCTYPE html "">
<html>
<!-- comment1 -->
<head /// 123>
</head>
<!-- comment2 -->
<body =123>
<div>42</div>
</body>
</html>
`,
assignTokenHandlers: (rewriter) => {
rewriter.on('text', (token) => {
if (token.text.trim().length > 0) {
token.text = '42';
}
rewriter.emitText(token);
});
},
})
);
it(
'rewrite comment',
createRewriterTest({
src: srcHtml,
expected: outdent`
<!DOCTYPE html "">
<html>
<!--42-->
<head /// 123>
</head>
<!--42-->
<body =123>
<div>Hey ya</div>
</body>
</html>
`,
assignTokenHandlers: (rewriter) => {
rewriter.on('comment', (token) => {
token.text = '42';
rewriter.emitComment(token);
});
},
})
);
it(
'rewrite doctype',
createRewriterTest({
src: srcHtml,
expected: outdent`
<!DOCTYPE html PUBLIC "42" "hey">
<html>
<!-- comment1 -->
<head /// 123>
</head>
<!-- comment2 -->
<body =123>
<div>Hey ya</div>
</body>
</html>
`,
assignTokenHandlers: (rewriter) => {
rewriter.on('doctype', (token) => {
token.publicId = '42';
token.systemId = 'hey';
rewriter.emitDoctype(token);
});
},
})
);
it(
'emit multiple',
createRewriterTest({
src: srcHtml,
expected: outdent`
<!DOCTYPE html "">
<wrap><html></wrap>
<!-- comment1 -->
<wrap><head 123=""></wrap>
</head>
<!-- comment2 -->
<wrap><body =123=""></wrap>
<wrap><div></wrap>Hey ya</div>
</body>
</html>
`,
assignTokenHandlers: (rewriter) => {
rewriter.on('startTag', (token) => {
rewriter.emitRaw('<wrap>');
rewriter.emitStartTag(token);
rewriter.emitRaw('</wrap>');
});
},
})
);
it(
'rewrite raw',
createRewriterTest({
src: srcHtml,
expected: outdent`
<!DOCTYPE html "">42
<html>42
<!-- comment1 -->42
<head /// 123>42
</head>42
<!-- comment2 -->42
<body =123>42
<div>42Hey ya</div>42
</body>42
</html>42
`,
assignTokenHandlers: (rewriter) => {
const rewriteRaw = (_: unknown, raw: string): void => {
rewriter.emitRaw(`${raw}42`);
};
rewriter
.on('doctype', rewriteRaw)
.on('startTag', rewriteRaw)
.on('endTag', rewriteRaw)
.on('comment', rewriteRaw);
},
})
);
it(
'Should escape entities in attributes and text',
createRewriterTest({
src: outdent`
<!DOCTYPE html "">
<html>
<head foo='bar"baz"'>
</head>
<body>
<div>foo&bar</div>
</body>
</html>
`,
expected: outdent`
<!DOCTYPE html "">
<html>
<head foo="bar"baz"">
</head>
<body>
<div>foo&bar</div>
</body>
</html>
`,
assignTokenHandlers: (rewriter) => {
rewriter.on('startTag', (token) => rewriter.emitStartTag(token));
rewriter.on('text', (token) => rewriter.emitText(token));
},
})
);
it('Last text chunk must be flushed (GH-271)', (done) => {
const parser = new RewritingStream();
let foundText = false;
parser.on('text', ({ text }) => {
foundText = true;
assert.strictEqual(text, 'text');
});
parser.once('finish', () => {
assert.ok(foundText);
done();
});
parser.write('text');
parser.end();
});
it('Should not accept binary input (GH-269)', () => {
const stream = new RewritingStream();
const buf = Buffer.from('test');
assert.throws(() => stream.write(buf), TypeError);
});
it(
'Should pass long text correctly (GH-292)',
createRewriterTest({
src: LONG_TEXT,
expected: LONG_TEXT,
})
);
it(
'Should emit comment after text correctly',
createRewriterTest({
src: LONG_TEXT_WITH_COMMENT,
expected: LONG_TEXT_WITH_COMMENT,
})
);
});