Function markSourceColumn

lib/internal/debugger/inspect_repl.js:154–168

(sourceText, position, useColors)

}

function markSourceColumn(sourceText, position, useColors) {
  if (!sourceText) return '';

  const head = StringPrototypeSlice(sourceText, 0, position);
  let tail = StringPrototypeSlice(sourceText, position);

  // Colourize char if stdout supports colours
  if (useColors) {
    tail = SideEffectFreeRegExpPrototypeSymbolReplace(/(.+?)([^\w]|$)/, tail,
                                                      '\u001b[32m$1\u001b[39m$2');
  }

  // Return source line with coloured char at `position`
  return head + tail;
}

function extractErrorMessage(stack) {
  if (!stack) return '<unknown>';