RuneFunc implemented

reader.go

@@ -119,16 +119,16 @@ func (r *Reader) UnreadRunes(n int) error {
 	return nil
 }
 
-// StringWhile reads runes and calls f for each one.
-// It returns all runes as a string for which f returned true.
-// It stops when f returns false or an error occured.
-// The rune for which f returned false will not be unread.
-func (r *Reader) StringWhile(f func(rn rune) bool) (string, error) {
+// StringWhile reads runes and calls all functions for each one.
+// It returns all runes as a string for which any function returned true.
+// It stops when all functions returned false or an error occured.
+// The rune for which that function returned false will not be unread.
+func (r *Reader) StringWhile(f ...RuneFunc) (string, error) {
 	s := new(strings.Builder)
 
 	var rn rune
 	var err error
-	for rn, err = r.Rune(); err == nil && f(rn); rn, err = r.Rune() {
+	for rn, err = r.Rune(); err == nil && findFirstTrue(rn, f); rn, err = r.Rune() {
 		s.WriteRune(rn)
 	}
 
@@ -136,8 +136,8 @@ func (r *Reader) StringWhile(f func(rn rune) bool) (string, error) {
 }
 
 // PeekStringWhile acts as StringWhile but does not advance reader position
-func (r *Reader) PeekStringWhile(f func(rn rune) bool) (string, error) {
-	str, err := r.StringWhile(f)
+func (r *Reader) PeekStringWhile(f ...RuneFunc) (string, error) {
+	str, err := r.StringWhile(f...)
 	if err != nil {
 		return "", err
 	}
@@ -149,14 +149,23 @@ func (r *Reader) PeekStringWhile(f func(rn rune) bool) (string, error) {
 	return str, nil
 }
 
-// StringUntil is a shorthand for r.StringWhile(func(rn rune) bool { return !f(rn) })
-func (r *Reader) StringUntil(f func(rn rune) bool) (string, error) {
-	return r.StringWhile(func(rn rune) bool { return !f(rn) })
+// SkipStringWhile acts as StringWhile but discards the string
+func (r *Reader) SkipStringWhile(f ...RuneFunc) error {
+	_, err := r.StringWhile(f...)
+	return err
+}
+
+// StringUntil reads runes and calls all functions for each one.
+// It returns all runes as a string for which all functions returned true.
+// It stops when any function returns false or an error occured.
+// The rune for which that function returned false will not be unread.
+func (r *Reader) StringUntil(f ...RuneFunc) (string, error) {
+	return r.StringWhile(func(rn rune) bool { return !findFirstTrue(rn, f) })
 }
 
 // PeekStringUntil acts as StringUntil but does not advance reader position
-func (r *Reader) PeekStringUntil(f func(rn rune) bool) (string, error) {
-	str, err := r.StringUntil(f)
+func (r *Reader) PeekStringUntil(f ...RuneFunc) (string, error) {
+	str, err := r.StringUntil(f...)
 	if err != nil {
 		return "", err
 	}
@@ -168,6 +177,12 @@ func (r *Reader) PeekStringUntil(f func(rn rune) bool) (string, error) {
 	return str, nil
 }
 
+// SkipStringUntil acts as StringUntil but discards the string
+func (r *Reader) SkipStringUntil(f ...RuneFunc) error {
+	_, err := r.StringUntil(f...)
+	return err
+}
+
 // Commit clears the internal buffer and therefore removes all data which were already read.
 // After calling Commit any unreads will return ErrNothingToUnread until another read occured.
 func (r *Reader) Commit() {

reader_test.go

@@ -26,11 +26,11 @@ func TestPos(t *testing.T) {
 func TestEOF(t *testing.T) {
 	r := NewReader(strings.NewReader("hello world\nasddsa"))
 
-	for line, err := r.StringUntil(isNewline); err == nil; line, err = r.StringUntil(isNewline) {
+	var line string
+	var err error
+	for line, err = r.StringUntil(IsNewLine); err == nil; line, err = r.StringUntil(IsNewLine) {
 		fmt.Println(line, err)
 	}
-}
 
-func isNewline(rn rune) bool {
-	return rn == '\n'
+	fmt.Println(line, err)
 }

runefunc.go

@@ -0,0 +1,52 @@
+package bufr
+
+import "git.milar.in/milarin/ds"
+
+type RuneFunc = func(rn rune) bool
+
+func IsNewLine(rn rune) bool {
+	return rn == '\n'
+}
+
+func IsSpace(rn rune) bool {
+	return rn == ' '
+}
+
+func IsWhitespace(rn rune) bool {
+	return IsSpace(rn) || IsNewLine(rn)
+}
+
+func And(f ...RuneFunc) RuneFunc {
+	return func(rn rune) bool {
+		return findFirstFalse(rn, f)
+	}
+}
+
+func Or(f ...RuneFunc) RuneFunc {
+	return func(rn rune) bool {
+		return findFirstTrue(rn, f)
+	}
+}
+
+func Not(f RuneFunc) RuneFunc {
+	return func(rn rune) bool {
+		return !f(rn)
+	}
+}
+
+func Is(rn rune) RuneFunc {
+	return func(r rune) bool {
+		return rn == r
+	}
+}
+
+func OneOf(runes string) RuneFunc {
+	m := ds.NewSet[rune]()
+	for _, rn := range runes {
+		m.Add(rn)
+	}
+
+	return func(r rune) bool {
+		return m.Has(r)
+	}
+}

utils.go

@@ -13,3 +13,21 @@ func prependString(str string, r io.Reader) *bufio.Reader {
 func prependRune(rn rune, r io.Reader) *bufio.Reader {
 	return prependString(string(rn), r)
 }
+
+func findFirstTrue(rn rune, functions []RuneFunc) bool {
+	for _, f := range functions {
+		if f(rn) {
+			return true
+		}
+	}
+	return false
+}
+
+func findFirstFalse(rn rune, functions []RuneFunc) bool {
+	for _, f := range functions {
+		if !f(rn) {
+			return false
+		}
+	}
+	return true
+}