Function processAdjacentLines

src/components/StructuredDiff/Fallback.tsx:153–224

(lineObjects: LineObject[])

// Group adjacent add/remove lines for word-level diffing
export function processAdjacentLines(lineObjects: LineObject[]): LineObject[] {
  const processedLines: LineObject[] = [];
  let i = 0;
  while (i < lineObjects.length) {
    const current = lineObjects[i];
    if (!current) {
      i++;
      continue;
    }

    // Find a sequence of remove followed by add (possible word-level diff candidates)
    if (current.type === 'remove') {
      const removeLines: LineObject[] = [current];
      let j = i + 1;

      // Collect consecutive remove lines
      while (j < lineObjects.length && lineObjects[j]?.type === 'remove') {
        const line = lineObjects[j];
        if (line) {
          removeLines.push(line);
        }
        j++;
      }

      // Check if there are add lines following the remove lines
      const addLines: LineObject[] = [];
      while (j < lineObjects.length && lineObjects[j]?.type === 'add') {
        const line = lineObjects[j];
        if (line) {
          addLines.push(line);
        }
        j++;
      }

      // If we have both remove and add lines, perform word-level diffing
      if (removeLines.length > 0 && addLines.length > 0) {
        // For word diffing, we'll compare each pair of lines or the closest available match
        const pairCount = Math.min(removeLines.length, addLines.length);

        // Add paired lines with word diff info
        for (let k = 0; k < pairCount; k++) {
          const removeLine = removeLines[k];
          const addLine = addLines[k];
          if (removeLine && addLine) {
            removeLine.wordDiff = true;
            addLine.wordDiff = true;

            // Store the matched pair for later word diffing
            removeLine.matchedLine = addLine;
            addLine.matchedLine = removeLine;
          }
        }

        // Add all remove lines (both paired and unpaired)
        processedLines.push(...removeLines.filter(Boolean));

        // Then add all add lines (both paired and unpaired)
        processedLines.push(...addLines.filter(Boolean));