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// Copyright 2019 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 (
"path"
"path/filepath"
"runtime"
"strings"
"sync"
"github.com/gobwas/glob"
"github.com/gobwas/glob/syntax"
)
var (
isWindows = runtime.GOOS == "windows"
defaultGlobCache = &globCache{
isCaseSensitive: false,
isWindows: isWindows,
cache: make(map[string]globErr),
}
filenamesGlobCache = &globCache{
isCaseSensitive: true, // TODO(bep) bench
isWindows: isWindows,
cache: make(map[string]globErr),
}
)
type globErr struct {
glob glob.Glob
err error
}
type globCache struct {
// Config
isCaseSensitive bool
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)
if gc.isCaseSensitive {
g, err = glob.Compile(pattern, '/')
} else {
g, err = glob.Compile(strings.ToLower(pattern), '/')
}
eg = globErr{
globDecorator{
g: g,
isCaseSensitive: gc.isCaseSensitive,
isWindows: gc.isWindows},
err,
}
gc.Lock()
gc.cache[pattern] = eg
gc.Unlock()
return eg.glob, eg.err
}
type globDecorator struct {
// Whether both pattern and the strings to match will be matched
// by their original case.
isCaseSensitive bool
// On Windows we may get filenames with Windows slashes to match,
// which wee need to normalize.
isWindows bool
g glob.Glob
}
func (g globDecorator) Match(s string) bool {
if g.isWindows {
s = filepath.ToSlash(s)
}
if !g.isCaseSensitive {
s = strings.ToLower(s)
}
return g.g.Match(s)
}
func GetGlob(pattern string) (glob.Glob, error) {
return defaultGlobCache.GetGlob(pattern)
}
func NormalizePath(p string) string {
return strings.Trim(path.Clean(filepath.ToSlash(strings.ToLower(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
}
type FilenameFilter struct {
shouldInclude func(filename string) bool
inclusions []glob.Glob
exclusions []glob.Glob
isWindows bool
}
// NewFilenameFilter creates a new Glob where the Match method will
// return true if the file should be exluded.
// Note that the inclusions will be checked first.
func NewFilenameFilter(inclusions, exclusions []string) (*FilenameFilter, error) {
filter := &FilenameFilter{isWindows: isWindows}
for _, include := range inclusions {
g, err := filenamesGlobCache.GetGlob(filepath.FromSlash(include))
if err != nil {
return nil, err
}
filter.inclusions = append(filter.inclusions, g)
}
for _, exclude := range exclusions {
g, err := filenamesGlobCache.GetGlob(filepath.FromSlash(exclude))
if err != nil {
return nil, err
}
filter.exclusions = append(filter.exclusions, g)
}
return filter, nil
}
// NewFilenameFilterForInclusionFunc create a new filter using the provided inclusion func.
func NewFilenameFilterForInclusionFunc(shouldInclude func(filename string) bool) *FilenameFilter {
return &FilenameFilter{shouldInclude: shouldInclude, isWindows: isWindows}
}
// Match returns whether filename should be included.
func (f *FilenameFilter) Match(filename string) bool {
if f == nil {
return true
}
if f.shouldInclude != nil {
if f.shouldInclude(filename) {
return true
}
if f.isWindows {
// The Glob matchers below handles this by themselves,
// for the shouldInclude we need to take some extra steps
// to make this robust.
winFilename := filepath.FromSlash(filename)
if filename != winFilename {
if f.shouldInclude(winFilename) {
return true
}
}
}
}
for _, inclusion := range f.inclusions {
if inclusion.Match(filename) {
return true
}
}
for _, exclusion := range f.exclusions {
if exclusion.Match(filename) {
return false
}
}
return f.inclusions == nil && f.shouldInclude == nil
}
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