toJSIdentifier function

String toJSIdentifier(
  1. String name
)

Escape name to make it into a valid identifier.

Implementation

String toJSIdentifier(String name) {
  if (name.isEmpty) return r'$';

  // Escape any invalid characters
  StringBuffer? buffer;
  for (var i = 0; i < name.length; i++) {
    final ch = name[i];
    final needsEscape = ch == r'$' || _invalidCharInIdentifier.hasMatch(ch);
    if (needsEscape) {
      buffer ??= StringBuffer(name.substring(0, i));
    }

    buffer?.write(needsEscape ? '\$${ch.codeUnits.join("")}' : ch);
  }

  final result = buffer != null ? '$buffer' : name;
  // Ensure the identifier first character is not numeric and that the whole
  // identifier is not a keyword.
  if (result.startsWith(RegExp('[0-9]')) || invalidVariableName(result)) {
    return '\$$result';
  }
  return result;
}