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// Copyright 2021 The Hugo Authors. All rights reserved.
//
// 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 glob
import (
"os"
"path"
"path/filepath"
"runtime"
"strings"
"sync"
"github.com/gobwas/glob"
"github.com/gobwas/glob/syntax"
)
const filepathSeparator = string(os.PathSeparator)
var (
isWindows = runtime.GOOS == "windows"
defaultGlobCache = &globCache{
isWindows: isWindows,
cache: make(map[string]globErr),
}
)
type globErr struct {
glob glob.Glob
err error
}
type globCache struct {
// Config
isWindows bool
// Cache
sync.RWMutex
cache map[string]globErr
}
func (gc *globCache) GetGlob(pattern string) (glob.Glob, error) {
var eg globErr
gc.RLock()
var found bool
eg, found = gc.cache[pattern]
gc.RUnlock()
if found {
return eg.glob, eg.err
}
var g glob.Glob
var err error
pattern = filepath.ToSlash(pattern)
g, err = glob.Compile(strings.ToLower(pattern), '/')
eg = globErr{
globDecorator{
g: g,
isWindows: gc.isWindows},
err,
}
gc.Lock()
gc.cache[pattern] = eg
gc.Unlock()
return eg.glob, eg.err
}
type globDecorator struct {
// On Windows we may get filenames with Windows slashes to match,
// which we need to normalize.
isWindows bool
g glob.Glob
}
func (g globDecorator) Match(s string) bool {
if g.isWindows {
s = filepath.ToSlash(s)
}
s = strings.ToLower(s)
return g.g.Match(s)
}
type globDecoratorDouble struct {
lowerCase glob.Glob
originalCase glob.Glob
}
func (g globDecoratorDouble) Match(s string) bool {
return g.lowerCase.Match(s) || g.originalCase.Match(s)
}
func GetGlob(pattern string) (glob.Glob, error) {
return defaultGlobCache.GetGlob(pattern)
}
func NormalizePath(p string) string {
return strings.ToLower(NormalizePathNoLower(p))
}
func NormalizePathNoLower(p string) string {
return strings.Trim(path.Clean(filepath.ToSlash(p)), "/.")
}
// ResolveRootDir takes a normalized path on the form "assets/**.json" and
// determines any root dir, i.e. any start path without any wildcards.
func ResolveRootDir(p string) string {
parts := strings.Split(path.Dir(p), "/")
var roots []string
for _, part := range parts {
if HasGlobChar(part) {
break
}
roots = append(roots, part)
}
if len(roots) == 0 {
return ""
}
return strings.Join(roots, "/")
}
// FilterGlobParts removes any string with glob wildcard.
func FilterGlobParts(a []string) []string {
b := a[:0]
for _, x := range a {
if !HasGlobChar(x) {
b = append(b, x)
}
}
return b
}
// HasGlobChar returns whether s contains any glob wildcards.
func HasGlobChar(s string) bool {
for i := 0; i < len(s); i++ {
if syntax.Special(s[i]) {
return true
}
}
return false
}
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