Function simplifyCodes

ts/codediff/char-diffs.ts:149–167

(codes: CharacterDiff[])

// after:  abc[123]def
// The "before" codes will have two consecutive "equal" spans due to the addition.
export function simplifyCodes(codes: CharacterDiff[]): CharacterDiff[] {
  const newCodes = [];
  for (let i = 0; i < codes.length; i++) {
    const code = codes[i];
    if (i == 0) {
      newCodes.push(code);
      continue;
    }

    const lastIndex = newCodes.length - 1;
    const lastCodeClass = newCodes[lastIndex][0];
    if (lastCodeClass == code[0]) {
      newCodes[lastIndex][2] = code[2]; // extend last run.
    } else {
      newCodes.push(code);
    }
  }
  return newCodes;
}

// codes are (span class, start, end) triples.
// This wraps html[start..end] in appropriate <span>..</span>s.