Merge pull request #5 from go-andiamo/escaping

Escaping

enclosures.go

@@ -30,6 +30,14 @@ func (e *Enclosure) clone() Enclosure {
 	}
 }
 
+func (e *Enclosure) isDoubleEscaping() bool {
+	return e.IsQuote && e.Escapable && e.End == e.Escape
+}
+
+func (e *Enclosure) isEscapable() bool {
+	return e.IsQuote && e.Escapable
+}
+
 var (
 	DoubleQuotes                              = _DoubleQuotes
 	DoubleQuotesBackSlashEscaped              = _DoubleQuotesBackSlashEscaped
@@ -48,7 +56,7 @@ var (
 	LeftRightDoublePrimeQuotes                = _LeftRightDoublePrimeQuotes
 	SingleLowHigh9Quotes                      = _SingleLowHigh9Quotes
 	DoubleLowHigh9Quotes                      = _DoubleLowHigh9Quotes
-	Brackets                                  = _Parenthesis
+	Parenthesis                               = _Parenthesis
 	CurlyBrackets                             = _CurlyBrackets
 	SquareBrackets                            = _SquareBrackets
 	LtGtAngleBrackets                         = _LtGtAngleBrackets

errors.go

@@ -0,0 +1,38 @@
+package splitter
+
+import "fmt"
+
+type SplittingErrorType int
+
+const (
+	Unopened SplittingErrorType = iota
+	Unclosed
+)
+
+type SplittingError struct {
+	Type      SplittingErrorType
+	Position  int
+	Rune      rune
+	Enclosure *Enclosure
+}
+
+func newSplittingError(t SplittingErrorType, pos int, r rune, enc *Enclosure) error {
+	return &SplittingError{
+		Type:      t,
+		Position:  pos,
+		Rune:      r,
+		Enclosure: enc,
+	}
+}
+
+const (
+	unopenedFmt = "unopened '%s' at position %d"
+	unclosedFmt = "unclosed '%s' at position %d"
+)
+
+func (e *SplittingError) Error() string {
+	if e.Type == Unopened {
+		return fmt.Sprintf(unopenedFmt, string(e.Rune), e.Position)
+	}
+	return fmt.Sprintf(unclosedFmt, string(e.Rune), e.Position)
+}