string function
Returns a parser that accepts the string
.
message
defines a custom error message.- If
ignoreCase
istrue
, 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',
);