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