addIrregularInflectionRule method Null safety

void addIrregularInflectionRule(
  1. String singular,
  2. String plural
)

Implementation

void addIrregularInflectionRule(String singular, String plural) {
  final s0 = singular.substring(0, 1);
  final srest = singular.substring(1);
  final p0 = plural.substring(0, 1);
  final prest = plural.substring(1);

  if (s0.toUpperCase() == p0.toUpperCase()) {
    addInflectionRule('(${s0})${srest}\$', (Match m) => '${m[1]}${srest}');
    addInflectionRule('(${p0})${prest}\$', (Match m) => '${m[1]}${srest}');
  } else {
    addInflectionRule('${s0.toUpperCase()}(?i)${srest}\$',
        (Match m) => '${s0.toUpperCase()}${srest}');
    addInflectionRule('${s0.toLowerCase()}(?i)${srest}\$',
        (Match m) => '${s0.toUpperCase()}${srest}');
    addInflectionRule('${p0.toUpperCase()}(?i)${prest}\$',
        (Match m) => '${s0.toUpperCase()}${srest}');
    addInflectionRule('${p0.toLowerCase()}(?i)${prest}\$',
        (Match m) => '${s0.toLowerCase()}${srest}');
  }
}