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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 (
"crypto/md5"
"fmt"
"sort"
"strings"
"github.com/google/blueprint/pathtools"
)
type GlobPath struct {
Pattern string
Excludes []string
Files []string
Deps []string
Name string
}
func verifyGlob(fileName, pattern string, excludes []string, g GlobPath) {
if pattern != g.Pattern {
panic(fmt.Errorf("Mismatched patterns %q and %q for glob file %q", pattern, g.Pattern, fileName))
}
if len(excludes) != len(g.Excludes) {
panic(fmt.Errorf("Mismatched excludes %v and %v for glob file %q", excludes, g.Excludes, fileName))
}
for i := range excludes {
if g.Excludes[i] != excludes[i] {
panic(fmt.Errorf("Mismatched excludes %v and %v for glob file %q", excludes, g.Excludes, fileName))
}
}
}
func (c *Context) glob(pattern string, excludes []string) ([]string, error) {
fileName := globToFileName(pattern, excludes)
// Try to get existing glob from the stored results
c.globLock.Lock()
g, exists := c.globs[fileName]
c.globLock.Unlock()
if exists {
// Glob has already been done, double check it is identical
verifyGlob(fileName, pattern, excludes, g)
return g.Files, nil
}
// Get a globbed file list
files, deps, 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[fileName]; !exists {
c.globs[fileName] = GlobPath{pattern, excludes, files, deps, fileName}
}
c.globLock.Unlock()
// Getting the list raced with another goroutine, throw away the results and use theirs
if exists {
verifyGlob(fileName, pattern, excludes, g)
return g.Files, nil
}
return files, nil
}
func (c *Context) Globs() []GlobPath {
fileNames := make([]string, 0, len(c.globs))
for k := range c.globs {
fileNames = append(fileNames, k)
}
sort.Strings(fileNames)
globs := make([]GlobPath, len(fileNames))
for i, fileName := range fileNames {
globs[i] = c.globs[fileName]
}
return globs
}
func globToString(pattern string) string {
ret := ""
for _, c := range pattern {
switch {
case c >= 'a' && c <= 'z',
c >= 'A' && c <= 'Z',
c >= '0' && c <= '9',
c == '_', c == '-', c == '/':
ret += string(c)
default:
ret += "_"
}
}
return ret
}
func globToFileName(pattern string, excludes []string) string {
name := globToString(pattern)
excludeName := ""
for _, e := range excludes {
excludeName += "__" + globToString(e)
}
// Prevent file names from reaching ninja's path component limit
if strings.Count(name, "/")+strings.Count(excludeName, "/") > 30 {
excludeName = fmt.Sprintf("___%x", md5.Sum([]byte(excludeName)))
}
return name + excludeName + ".glob"
}
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