feat: Inital commit

vendor/github.com/nlnwa/whatwg-url/url/inputstring.go

@@ -0,0 +1,118 @@
+/*
+ * Copyright 2020 National Library of Norway.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package url
+
+import (
+	"strings"
+	"unicode/utf8"
+)
+
+type inputString struct {
+	s       string
+	runes   []rune
+	pointer int
+	eof     bool
+	length  int
+}
+
+func newInputString(s string) *inputString {
+	i := &inputString{runes: []rune(s), pointer: -1}
+	i.s = s
+	i.length = len(i.runes)
+	return i
+}
+
+func (i *inputString) nextCodePoint() rune {
+	i.pointer++
+	if i.pointer >= i.length {
+		i.eof = true
+		return utf8.RuneError
+	}
+	r := i.runes[i.pointer]
+
+	return r
+}
+
+func (i *inputString) currentIsInvalid() bool {
+	return i.runes[i.pointer] == utf8.RuneError
+}
+
+func (i *inputString) getCurrentAsByte() byte {
+	if i.pointer >= i.length {
+		i.eof = true
+		return 0
+	}
+	var pos int
+	for j := 0; j < i.pointer; j++ {
+		pos += utf8.RuneLen(i.runes[j])
+	}
+	return i.s[pos]
+}
+
+func (i *inputString) rewindLast() {
+	i.eof = false
+	i.pointer--
+}
+
+func (i *inputString) reset() {
+	i.pointer = -1
+	i.eof = false
+}
+
+func (i *inputString) rewind(length int) {
+	i.pointer -= length
+	i.eof = false
+}
+
+func (i *inputString) remainingFromPointer() string {
+	if i.eof {
+		return ""
+	}
+	return string(i.runes[i.pointer:])
+}
+
+func (i *inputString) remainingStartsWith(s string) bool {
+	if i.eof {
+		return false
+	}
+
+	return strings.HasPrefix(string(i.runes[i.pointer+1:]), s)
+}
+
+// remainingIsInvalidPercentEncoded returns true if the first three characters in the rune array are not '%' followed by two hex digits.
+// If true, the second return value is the invalid percent encoded string.
+func (i *inputString) remainingIsInvalidPercentEncoded() (bool, string) {
+	return remainingIsInvalidPercentEncoded(i.runes[i.pointer:])
+}
+
+// remainingIsInvalidPercentEncoded returns true if the first three characters in the rune array are not '%' followed by two hex digits.
+// If true, the second return value is the invalid percent encoded string.
+func remainingIsInvalidPercentEncoded(runes []rune) (bool, string) {
+	if len(runes) >= 1 && runes[0] == '%' &&
+		(len(runes) < 3 || (!ASCIIHexDigit.Test(uint(runes[1])) || !ASCIIHexDigit.Test(uint(runes[2])))) {
+		l := 3
+		if len(runes) < 3 {
+			l = len(runes)
+		}
+		return true, string(runes[0:l])
+	}
+	return false, ""
+}
+
+func (i *inputString) String() string {
+	return string(i.runes)
+}