findTokenBudgetPositions function

List<({int end, int start})> findTokenBudgetPositions(String text)

Find all token budget positions in text (for UI highlighting).

Implementation

List<({int start, int end})> findTokenBudgetPositions(String text) {
  final positions = <({int start, int end})>[];

  final startMatch = _shorthandStartRe.firstMatch(text);
  if (startMatch != null) {
    final offset =
        startMatch.start +
        startMatch.group(0)!.length -
        startMatch.group(0)!.trimLeft().length;
    positions.add((
      start: offset,
      end: startMatch.start + startMatch.group(0)!.length,
    ));
  }

  final endMatch = _shorthandEndRe.firstMatch(text);
  if (endMatch != null) {
    final endStart = endMatch.start + 1; // +1: regex includes leading \s
    // Avoid double-counting when input is just "+500k".
    final alreadyCovered = positions.any(
      (p) => endStart >= p.start && endStart < p.end,
    );
    if (!alreadyCovered) {
      positions.add((
        start: endStart,
        end: endMatch.start + endMatch.group(0)!.length,
      ));
    }
  }

  for (final match in _verboseReG.allMatches(text)) {
    positions.add((start: match.start, end: match.end));
  }

  return positions;
}