isValid method
Tells whether the instance is valid.
Implementation
@override
bool isValid(String instance) {
final maxLines = this.maxLines;
if (maxLines != null) {
var n = maxLines;
if (n < 1) {
return false;
}
for (var i = 0; i < instance.length; i++) {
if (instance.codeUnitAt(i) == 10) {
n--;
if (n < 1) {
return false;
}
}
}
}
final lengthInUtf16 = this.lengthInUtf16;
if (lengthInUtf16 != null && !lengthInUtf16.isValid(instance.length)) {
return false;
}
final lengthInUtf8 = this.lengthInUtf8;
if (lengthInUtf8 != null &&
!lengthInUtf8.isValid(utf8.encode(instance).length)) {
return false;
}
final regExp = this.regExp;
if (regExp != null && !regExp.hasMatch(instance)) {
return false;
}
return super.isValid(instance);
}