regex/src/utils-internals.js

Regex template tag with extended syntax, context-aware interpolation, and always-on best practices

// Separating some utils for improved tree shaking of the `./internals` export

const noncapturingDelim = String.raw`\(\?(?:[:=!>A-Za-z\-]|<[=!]|\(DEFINE\))`;

/**
Updates the array in place by incrementing each value greater than or equal to the threshold.
@param {Array<number>} arr
@param {number} threshold
*/
function incrementIfAtLeast(arr, threshold) {
  for (let i = 0; i < arr.length; i++) {
    if (arr[i] >= threshold) {
      arr[i]++;
    }
  }
}

/**
@param {string} str
@param {number} pos
@param {string} oldValue
@param {string} newValue
@returns {string}
*/
function spliceStr(str, pos, oldValue, newValue) {
  return str.slice(0, pos) + newValue + str.slice(pos + oldValue.length);
}

export {
  incrementIfAtLeast,
  noncapturingDelim,
  spliceStr,
};