// Compile takes a list of string filters and returns a Filter interface
// for matching a given string against the filter list. The filter list
// supports glob matching too, ie:
//
// f, _ := Compile([]string{"cpu", "mem", "net*"})
// f.Match("cpu") // true
// f.Match("network") // true
// f.Match("memory") // false
//
func Compile(filters []string) (Filter, error) {
// return if there is nothing to compile
if len(filters) == 0 {
return nil, nil
}
// check if we can compile a non-glob filter
noGlob := true
for _, filter := range filters {
if hasMeta(filter) {
noGlob = false
break
}
}
switch {
case noGlob:
// return non-globbing filter if not needed.
return compileFilterNoGlob(filters), nil
case len(filters) == 1:
return glob.Compile(filters[0])
default:
return glob.Compile("{" + strings.Join(filters, ",") + "}")
}
}
// Compile compiles a pattern for future use.
func Compile(p *Pattern) (Matcher, error) {
ret := &pattern{}
if p == nil {
return ret, nil
}
f := func(slice []string, sep rune) (result []matcher, err error) {
result = make([]matcher, 0, len(slice))
for _, s := range slice {
var (
ok bool
err error
r *regexp.Regexp
g glob.Glob
)
if s == "" {
result = append(result, plain(""))
continue
}
if s, ok = isRegex(s); ok {
if r, err = regexp.Compile(s); err != nil {
return nil, err
}
result = append(result, (*regex)(r))
continue
}
if sep != 0 {
g, err = glob.Compile(s, sep)
} else {
g, err = glob.Compile(s)
}
if err != nil {
return nil, err
}
result = append(result, g)
}
return result, nil
}
var err error
set := func(dst *[]matcher, src []string, sep rune) bool {
var result []matcher
if result, err = f(src, sep); err != nil {
return false
}
*dst = result
return true
}
if set(&ret.Accept, p.Accept, '/') &&
set(&ret.Reject, p.Reject, '/') &&
set(&ret.Host, p.Host, '.') &&
set(&ret.ExcludeHost, p.ExcludeHost, '.') &&
set(&ret.Dir, p.Dir, '/') &&
set(&ret.ExcludeDir, p.ExcludeDir, '/') &&
set(&ret.File, p.File, 0) &&
set(&ret.ExcludeFile, p.ExcludeFile, 0) {
return ret, nil
}
return nil, err
}
func compileFilter(filter []string) (glob.Glob, error) {
if len(filter) == 0 {
return nil, nil
}
var g glob.Glob
var err error
if len(filter) == 1 {
g, err = glob.Compile(filter[0])
} else {
g, err = glob.Compile("{" + strings.Join(filter, ",") + "}")
}
return g, err
}
func main() {
pattern := flag.String("p", "", "pattern to draw")
sep := flag.String("s", "", "comma separated list of separators")
fixture := flag.String("f", "", "fixture")
verbose := flag.Bool("v", false, "verbose")
flag.Parse()
if *pattern == "" {
flag.Usage()
os.Exit(1)
}
var separators []rune
for _, c := range strings.Split(*sep, ",") {
if r, w := utf8.DecodeRuneInString(c); len(c) > w {
fmt.Println("only single charactered separators are allowed")
os.Exit(1)
} else {
separators = append(separators, r)
}
}
g, err := glob.Compile(*pattern, separators...)
if err != nil {
fmt.Println("could not compile pattern:", err)
os.Exit(1)
}
if !*verbose {
fmt.Println(g.Match(*fixture))
return
}
fmt.Printf("result: %t\n", g.Match(*fixture))
cb := testing.Benchmark(func(b *testing.B) {
for i := 0; i < b.N; i++ {
glob.Compile(*pattern, separators...)
}
})
fmt.Println("compile:", benchString(cb))
mb := testing.Benchmark(func(b *testing.B) {
for i := 0; i < b.N; i++ {
g.Match(*fixture)
}
})
fmt.Println("match: ", benchString(mb))
}
// Glob takes a glob pattern and returns another files object only containing
// matched files.
//
// This is designed to be called from a template.
//
// {{ range $name, $content := .Files.Glob("foo/**") }}
// {{ $name }}: |
// {{ .Files.Get($name) | indent 4 }}{{ end }}
func (f Files) Glob(pattern string) Files {
g, err := glob.Compile(pattern, '/')
if err != nil {
g, _ = glob.Compile("**")
}
nf := NewFiles(nil)
for name, contents := range f {
if g.Match(name) {
nf[name] = contents
}
}
return nf
}
func main() {
pattern := flag.String("p", "", "pattern to draw")
sep := flag.String("s", "", "comma separated list of separators characters")
flag.Parse()
if *pattern == "" {
flag.Usage()
os.Exit(1)
}
var separators []rune
if len(*sep) > 0 {
for _, c := range strings.Split(*sep, ",") {
if r, w := utf8.DecodeRuneInString(c); len(c) > w {
fmt.Println("only single charactered separators are allowed")
os.Exit(1)
} else {
separators = append(separators, r)
}
}
}
glob, err := glob.Compile(*pattern, separators...)
if err != nil {
fmt.Println("could not compile pattern:", err)
os.Exit(1)
}
matcher := glob.(match.Matcher)
fmt.Fprint(os.Stdout, debug.Graphviz(*pattern, matcher))
}
// CompileFilter takes a list of glob "filters", ie:
// ["MAIN.*", "CPU.*", "NET"]
// and compiles them into a glob object. This glob object can
// then be used to match keys to the filter.
func CompileFilter(filters []string) (glob.Glob, error) {
var out glob.Glob
// return if there is nothing to compile
if len(filters) == 0 {
return out, nil
}
var err error
if len(filters) == 1 {
out, err = glob.Compile(filters[0])
} else {
out, err = glob.Compile("{" + strings.Join(filters, ",") + "}")
}
return out, err
}
func main() {
pattern := flag.String("p", "", "pattern to draw")
sep := flag.String("s", "", "comma separated list of separators")
fixture := flag.String("f", "", "fixture")
verbose := flag.Bool("v", false, "verbose")
flag.Parse()
if *pattern == "" {
flag.Usage()
os.Exit(1)
}
separators := strings.Split(*sep, ",")
g, err := glob.Compile(*pattern, separators...)
if err != nil {
fmt.Println("could not compile pattern:", err)
os.Exit(1)
}
if !*verbose {
fmt.Println(g.Match(*fixture))
return
}
fmt.Printf("result: %t\n", g.Match(*fixture))
cb := testing.Benchmark(func(b *testing.B) {
for i := 0; i < b.N; i++ {
glob.Compile(*pattern, separators...)
}
})
fmt.Println("compile:", benchString(cb))
mb := testing.Benchmark(func(b *testing.B) {
for i := 0; i < b.N; i++ {
g.Match(*fixture)
}
})
fmt.Println("match: ", benchString(mb))
}
func main() {
pattern := flag.String("p", "", "pattern to draw")
sep := flag.String("s", "", "comma separated list of separators")
flag.Parse()
if *pattern == "" {
flag.Usage()
os.Exit(1)
}
glob, err := glob.Compile(*pattern, strings.Split(*sep, ",")...)
if err != nil {
fmt.Println("could not compile pattern:", err)
os.Exit(1)
}
matcher := glob.(match.Matcher)
fmt.Fprint(os.Stdout, draw(*pattern, matcher))
}
func Compile(path string) (*GlobPath, error) {
out := GlobPath{
hasMeta: hasMeta(path),
path: path,
}
// if there are no glob meta characters in the path, don't bother compiling
// a glob object or finding the root directory. (see short-circuit in Match)
if !out.hasMeta {
return &out, nil
}
var err error
if out.g, err = glob.Compile(path, os.PathSeparator); err != nil {
return nil, err
}
// Get the root directory for this filepath
out.root = findRootDir(path)
return &out, nil
}
func parseIgnoreFile(fd io.Reader, currentFile string, modtimes map[string]time.Time) ([]Pattern, error) {
var patterns []Pattern
defaultResult := resultInclude
if runtime.GOOS == "darwin" || runtime.GOOS == "windows" {
defaultResult |= resultFoldCase
}
addPattern := func(line string) error {
pattern := Pattern{
result: defaultResult,
}
// Allow prefixes to be specified in any order, but only once.
var seenPrefix [3]bool
for {
if strings.HasPrefix(line, "!") && !seenPrefix[0] {
seenPrefix[0] = true
line = line[1:]
pattern.result ^= resultInclude
} else if strings.HasPrefix(line, "(?i)") && !seenPrefix[1] {
seenPrefix[1] = true
pattern.result |= resultFoldCase
line = line[4:]
} else if strings.HasPrefix(line, "(?d)") && !seenPrefix[2] {
seenPrefix[2] = true
pattern.result |= resultDeletable
line = line[4:]
} else {
break
}
}
if pattern.result.IsCaseFolded() {
line = strings.ToLower(line)
}
pattern.pattern = line
var err error
if strings.HasPrefix(line, "/") {
// Pattern is rooted in the current dir only
pattern.match, err = glob.Compile(line[1:], '/')
if err != nil {
return fmt.Errorf("invalid pattern %q in ignore file (%v)", line, err)
}
patterns = append(patterns, pattern)
} else if strings.HasPrefix(line, "**/") {
// Add the pattern as is, and without **/ so it matches in current dir
pattern.match, err = glob.Compile(line, '/')
if err != nil {
return fmt.Errorf("invalid pattern %q in ignore file (%v)", line, err)
}
patterns = append(patterns, pattern)
line = line[3:]
pattern.pattern = line
pattern.match, err = glob.Compile(line, '/')
if err != nil {
return fmt.Errorf("invalid pattern %q in ignore file (%v)", line, err)
}
patterns = append(patterns, pattern)
} else if strings.HasPrefix(line, "#include ") {
includeRel := line[len("#include "):]
includeFile := filepath.Join(filepath.Dir(currentFile), includeRel)
includes, err := loadIgnoreFile(includeFile, modtimes)
if err != nil {
return fmt.Errorf("include of %q: %v", includeRel, err)
}
patterns = append(patterns, includes...)
} else {
// Path name or pattern, add it so it matches files both in
// current directory and subdirs.
pattern.match, err = glob.Compile(line, '/')
if err != nil {
return fmt.Errorf("invalid pattern %q in ignore file (%v)", line, err)
}
patterns = append(patterns, pattern)
line := "**/" + line
pattern.pattern = line
pattern.match, err = glob.Compile(line, '/')
if err != nil {
return fmt.Errorf("invalid pattern %q in ignore file (%v)", line, err)
}
patterns = append(patterns, pattern)
}
return nil
}
scanner := bufio.NewScanner(fd)
var err error
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
switch {
case line == "":
continue
case strings.HasPrefix(line, "//"):
continue
}
line = filepath.ToSlash(line)
switch {
case strings.HasPrefix(line, "#"):
err = addPattern(line)
case strings.HasSuffix(line, "/**"):
err = addPattern(line)
case strings.HasSuffix(line, "/"):
err = addPattern(line + "**")
default:
err = addPattern(line)
if err == nil {
err = addPattern(line + "/**")
}
}
if err != nil {
return nil, err
}
}
return patterns, nil
}
func parseIgnoreFile(fd io.Reader, currentFile string, seen map[string]bool) ([]Pattern, error) {
var patterns []Pattern
addPattern := func(line string) error {
pattern := Pattern{
pattern: line,
include: true,
foldCase: runtime.GOOS == "darwin" || runtime.GOOS == "windows",
}
if strings.HasPrefix(line, "!") {
line = line[1:]
pattern.include = false
}
if strings.HasPrefix(line, "(?i)") {
pattern.foldCase = true
line = line[4:]
}
if pattern.foldCase {
line = strings.ToLower(line)
}
var err error
if strings.HasPrefix(line, "/") {
// Pattern is rooted in the current dir only
pattern.match, err = glob.Compile(line[1:])
if err != nil {
return fmt.Errorf("invalid pattern %q in ignore file", line)
}
patterns = append(patterns, pattern)
} else if strings.HasPrefix(line, "**/") {
// Add the pattern as is, and without **/ so it matches in current dir
pattern.match, err = glob.Compile(line)
if err != nil {
return fmt.Errorf("invalid pattern %q in ignore file", line)
}
patterns = append(patterns, pattern)
line = line[3:]
pattern.pattern = line
pattern.match, err = glob.Compile(line)
if err != nil {
return fmt.Errorf("invalid pattern %q in ignore file", line)
}
patterns = append(patterns, pattern)
} else if strings.HasPrefix(line, "#include ") {
includeRel := line[len("#include "):]
includeFile := filepath.Join(filepath.Dir(currentFile), includeRel)
includes, err := loadIgnoreFile(includeFile, seen)
if err != nil {
return fmt.Errorf("include of %q: %v", includeRel, err)
}
patterns = append(patterns, includes...)
} else {
// Path name or pattern, add it so it matches files both in
// current directory and subdirs.
pattern.match, err = glob.Compile(line)
if err != nil {
return fmt.Errorf("invalid pattern %q in ignore file", line)
}
patterns = append(patterns, pattern)
line := "**/" + line
pattern.pattern = line
pattern.match, err = glob.Compile(line)
if err != nil {
return fmt.Errorf("invalid pattern %q in ignore file", line)
}
patterns = append(patterns, pattern)
}
return nil
}
scanner := bufio.NewScanner(fd)
var err error
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
switch {
case line == "":
continue
case strings.HasPrefix(line, "//"):
continue
}
line = filepath.ToSlash(line)
switch {
case strings.HasPrefix(line, "#"):
err = addPattern(line)
case strings.HasSuffix(line, "/**"):
err = addPattern(line)
case strings.HasSuffix(line, "/"):
err = addPattern(line)
default:
err = addPattern(line)
if err == nil {
err = addPattern(line + "/**")
}
}
if err != nil {
return nil, err
}
}
return patterns, nil
}