lex_function.go: lexIdentFuncCall: move some more code out

lex_function.go

@@ -35,25 +35,33 @@ func _lexIdentFuncCallParanClose(s *State, buff []rune) (LexType, error) {
  return LexRoot, nil
 }
 
+func _lexIdentFuncCallEndError(s *State) error {
+ s.errorOffset++
+ if s.openParenth > 0 {
+ return s.errorSyntax("'(' not closed")
+ }
+ return s.errorSyntax("expected a function call")
+}
+
+func _lexIdentFuncCallBackslash(s *State, buff []rune) []rune {
+ buff = append(buff, '\\')
+ s.move(1)
+ if !s.end() {
+ buff = append(buff, s.pattern[s.patternPos])
+ }
+ return buff
+}
+
 func lexIdentFuncCall(s *State) (LexType, error) {
  if s.end() {
- s.errorOffset++
- if s.openParenth > 0 {
- return nil, s.errorSyntax("'(' not closed")
- }
- return nil, s.errorSyntax("expected a function call")
+ return nil, _lexIdentFuncCallEndError(s)
  }
  buff := []rune{}
  for ; !s.end(); s.move(1) {
  c := s.pattern[s.patternPos]
  switch c {
  case '\\':
- buff = append(buff, '\\')
- s.move(1)
- if s.end() {
- continue
- }
- buff = append(buff, s.pattern[s.patternPos])
+ buff = _lexIdentFuncCallBackslash(s, buff)
  continue
  case '(':
  if s.openBracket {