string function

@useResult Parser<String> string(String string, { String? message, bool ignoreCase = false, })

Returns a parser that accepts the string.

• message defines a custom error message.
• If ignoreCase is true, the string is matched in a case-insensitive manner.

For example, string('foo') succeeds and consumes the input string 'foo'. Fails for any other input.

Implementation

@useResult
Parser<String> string(
  String string, {
  String? message,
  bool ignoreCase = false,
}) => ignoreCase
    ? predicate(
        string.length,
        (value) => equalsIgnoreAsciiCase(string, value),
        message ?? '"$string" (case-insensitive) expected',
      )
    : predicate(
        string.length,
        (value) => string == value,
        message ?? '"$string" expected',
      );