parse-chunked.ts

import type { ParserOptions, TreeAdapterTypeMap } from 'parse5';
import { ParserStream } from '../../lib/index.js';
import { makeChunks } from 'parse5-test-utils/utils/common.js';

export function parseChunked<T extends TreeAdapterTypeMap>(
    test: { input: string; fragmentContext?: T['parentNode'] },
    opts: ParserOptions<T>,
    minChunkSize?: number,
    maxChunkSize?: number
): { node: TreeAdapterTypeMap['document']; chunks: string[] } {
    const parserStream = test.fragmentContext
        ? ParserStream.getFragmentStream(test.fragmentContext, opts)
        : new ParserStream(opts);
    const chunks = makeChunks(test.input, minChunkSize, maxChunkSize);

    // NOTE: set small waterline for testing purposes
    parserStream.parser.tokenizer.preprocessor.bufferWaterline = 8;

    for (let i = 0; i < chunks.length - 1; i++) {
        if (typeof chunks[i] !== 'string') {
            throw new TypeError('Expected chunk to be a string');
        }
        parserStream.write(chunks[i]);
    }

    parserStream.end(chunks[chunks.length - 1]);

    return {
        node: test.fragmentContext ? parserStream.getFragment() : parserStream.document,
        chunks,
    };
}