export function textPositionSelectorMatcher()

in packages/selector/src/text/match-text-position.ts [57:79]

• 20 lines of code
• 1 McCabe index (conditional complexity)

export function textPositionSelectorMatcher(
  selector: TextPositionSelector,
): <TChunk extends Chunk<any>>(
  scope: Chunker<TChunk>,
) => AsyncGenerator<ChunkRange<TChunk>, void, void> {
  const { start, end } = selector;

  return async function* matchAll<TChunk extends Chunk<string>>(
    textChunks: Chunker<TChunk>,
  ) {
    const codeUnitSeeker = new TextSeeker(textChunks);
    const codePointSeeker = new CodePointSeeker(codeUnitSeeker);

    codePointSeeker.seekTo(start);
    const startChunk = codeUnitSeeker.currentChunk;
    const startIndex = codeUnitSeeker.offsetInChunk;
    codePointSeeker.seekTo(end);
    const endChunk = codeUnitSeeker.currentChunk;
    const endIndex = codeUnitSeeker.offsetInChunk;

    yield { startChunk, startIndex, endChunk, endIndex };
  };
}