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// Copyright 2015 go-swagger maintainers
//
// 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 mangling
import (
"strings"
"unicode"
"unicode/utf8"
)
// Removes leading whitespaces
func trim(str string) string { return strings.TrimSpace(str) }
// upper is strings.ToUpper() combined with trim
func upper(str string) string {
return strings.ToUpper(trim(str))
}
// lower is strings.ToLower() combined with trim
func lower(str string) string {
return strings.ToLower(trim(str))
}
// isEqualFoldIgnoreSpace is the same as strings.EqualFold, but
// it ignores leading and trailing blank spaces in the compared
// string.
//
// base is assumed to be composed of upper-cased runes, and be already
// trimmed.
//
// This code is heavily inspired from strings.EqualFold.
func isEqualFoldIgnoreSpace(base []rune, str string) bool {
var i, baseIndex int
// equivalent to b := []byte(str), but without data copy
b := hackStringBytes(str)
for i < len(b) {
if c := b[i]; c < utf8.RuneSelf {
// fast path for ASCII
if c != ' ' && c != '\t' {
break
}
i++
continue
}
// unicode case
r, size := utf8.DecodeRune(b[i:])
if !unicode.IsSpace(r) {
break
}
i += size
}
if i >= len(b) {
return len(base) == 0
}
for _, baseRune := range base {
if i >= len(b) {
break
}
if c := b[i]; c < utf8.RuneSelf {
// single byte rune case (ASCII)
if baseRune >= utf8.RuneSelf {
return false
}
baseChar := byte(baseRune)
if c != baseChar && ((c < 'a') || (c > 'z') || (c-'a'+'A' != baseChar)) {
return false
}
baseIndex++
i++
continue
}
// unicode case
r, size := utf8.DecodeRune(b[i:])
if unicode.ToUpper(r) != baseRune {
return false
}
baseIndex++
i += size
}
if baseIndex != len(base) {
return false
}
// all passed: now we should only have blanks
for i < len(b) {
if c := b[i]; c < utf8.RuneSelf {
// fast path for ASCII
if c != ' ' && c != '\t' {
return false
}
i++
continue
}
// unicode case
r, size := utf8.DecodeRune(b[i:])
if !unicode.IsSpace(r) {
return false
}
i += size
}
return true
}
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