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// Copyright 2015 Google Inc. 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 blueprint
import (
"fmt"
"slices"
"sort"
"strings"
"github.com/google/blueprint/pathtools"
)
func verifyGlob(key globKey, pattern string, excludes []string, g pathtools.GlobResult) {
if pattern != g.Pattern {
panic(fmt.Errorf("Mismatched patterns %q and %q for glob key %q", pattern, g.Pattern, key))
}
if len(excludes) != len(g.Excludes) {
panic(fmt.Errorf("Mismatched excludes %v and %v for glob key %q", excludes, g.Excludes, key))
}
for i := range excludes {
if g.Excludes[i] != excludes[i] {
panic(fmt.Errorf("Mismatched excludes %v and %v for glob key %q", excludes, g.Excludes, key))
}
}
}
func (c *Context) glob(pattern string, excludes []string) ([]string, error) {
// Sort excludes so that two globs with the same excludes in a different order reuse the same
// key. Make a copy first to avoid modifying the caller's version.
excludes = slices.Clone(excludes)
sort.Strings(excludes)
key := globToKey(pattern, excludes)
// Try to get existing glob from the stored results
c.globLock.Lock()
g, exists := c.globs[key]
c.globLock.Unlock()
if exists {
// Glob has already been done, double check it is identical
verifyGlob(key, pattern, excludes, g)
// Return a copy so that modifications don't affect the cached value.
return slices.Clone(g.Matches), nil
}
// Get a globbed file list
result, err := c.fs.Glob(pattern, excludes, pathtools.FollowSymlinks)
if err != nil {
return nil, err
}
// Store the results
c.globLock.Lock()
if g, exists = c.globs[key]; !exists {
c.globs[key] = result
}
c.globLock.Unlock()
if exists {
// Getting the list raced with another goroutine, throw away the results and use theirs
verifyGlob(key, pattern, excludes, g)
// Return a copy so that modifications don't affect the cached value.
return slices.Clone(g.Matches), nil
}
// Return a copy so that modifications don't affect the cached value.
return slices.Clone(result.Matches), nil
}
func (c *Context) Globs() pathtools.MultipleGlobResults {
keys := make([]globKey, 0, len(c.globs))
for k := range c.globs {
keys = append(keys, k)
}
sort.Slice(keys, func(i, j int) bool {
if keys[i].pattern != keys[j].pattern {
return keys[i].pattern < keys[j].pattern
}
return keys[i].excludes < keys[j].excludes
})
globs := make(pathtools.MultipleGlobResults, len(keys))
for i, key := range keys {
globs[i] = c.globs[key]
}
return globs
}
// globKey combines a pattern and a list of excludes into a hashable struct to be used as a key in
// a map.
type globKey struct {
pattern string
excludes string
}
// globToKey converts a pattern and an excludes list into a globKey struct that is hashable and
// usable as a key in a map.
func globToKey(pattern string, excludes []string) globKey {
return globKey{pattern, strings.Join(excludes, "|")}
}
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