/usr/share/gocode/src/golang.org/x/text/gen.go is in golang-golang-x-text-dev 0.0~git20170627.0.6353ef0-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
// gen runs go generate on Unicode- and CLDR-related package in the text
// repositories, taking into account dependencies and versions.
package main
import (
"bytes"
"flag"
"fmt"
"go/build"
"go/format"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"regexp"
"runtime"
"strings"
"sync"
"unicode"
"golang.org/x/text/internal/gen"
)
var (
verbose = flag.Bool("v", false, "verbose output")
force = flag.Bool("force", false, "ignore failing dependencies")
doCore = flag.Bool("core", false, "force an update to core")
excludeList = flag.String("exclude", "",
"comma-separated list of packages to exclude")
// The user can specify a selection of packages to build on the command line.
args []string
)
func exclude(pkg string) bool {
if len(args) > 0 {
return !contains(args, pkg)
}
return contains(strings.Split(*excludeList, ","), pkg)
}
// TODO:
// - Better version handling.
// - Generate tables for the core unicode package?
// - Add generation for encodings. This requires some retooling here and there.
// - Running repo-wide "long" tests.
var vprintf = fmt.Printf
func main() {
gen.Init()
args = flag.Args()
if !*verbose {
// Set vprintf to a no-op.
vprintf = func(string, ...interface{}) (int, error) { return 0, nil }
}
// TODO: create temporary cache directory to load files and create and set
// a "cache" option if the user did not specify the UNICODE_DIR environment
// variable. This will prevent duplicate downloads and also will enable long
// tests, which really need to be run after each generated package.
updateCore := *doCore
if gen.UnicodeVersion() != unicode.Version {
fmt.Printf("Requested Unicode version %s; core unicode version is %s.\n",
gen.UnicodeVersion(),
unicode.Version)
// TODO: use collate to compare. Simple comparison will work, though,
// until Unicode reaches version 10. To avoid circular dependencies, we
// could use the NumericWeighter without using package collate using a
// trivial Weighter implementation.
if gen.UnicodeVersion() < unicode.Version && !*force {
os.Exit(2)
}
updateCore = true
}
var unicode = &dependency{}
if updateCore {
fmt.Printf("Updating core to version %s...\n", gen.UnicodeVersion())
unicode = generate("unicode")
// Test some users of the unicode packages, especially the ones that
// keep a mirrored table. These may need to be corrected by hand.
generate("regexp", unicode)
generate("strconv", unicode) // mimics Unicode table
generate("strings", unicode)
generate("testing", unicode) // mimics Unicode table
}
var (
cldr = generate("./unicode/cldr", unicode)
language = generate("./language", cldr)
internal = generate("./internal", unicode, language)
norm = generate("./unicode/norm", unicode)
rangetable = generate("./unicode/rangetable", unicode)
cases = generate("./cases", unicode, norm, language, rangetable)
width = generate("./width", unicode)
bidi = generate("./unicode/bidi", unicode, norm, rangetable)
mib = generate("./encoding/internal/identifier", unicode)
_ = generate("./encoding/htmlindex", unicode, language, mib)
_ = generate("./encoding/ianaindex", unicode, language, mib)
_ = generate("./secure/precis", unicode, norm, rangetable, cases, width, bidi)
_ = generate("./currency", unicode, cldr, language, internal)
_ = generate("./internal/number", unicode, cldr, language, internal)
_ = generate("./feature/plural", unicode, cldr, language, internal)
_ = generate("./internal/export/idna", unicode, bidi, norm)
_ = generate("./language/display", unicode, cldr, language, internal)
_ = generate("./collate", unicode, norm, cldr, language, rangetable)
_ = generate("./search", unicode, norm, cldr, language, rangetable)
)
all.Wait()
// Copy exported packages to the destination golang.org repo.
copyExported("golang.org/x/net/idna")
if updateCore {
copyVendored()
}
if hasErrors {
fmt.Println("FAIL")
os.Exit(1)
}
vprintf("SUCCESS\n")
}
var (
all sync.WaitGroup
hasErrors bool
)
type dependency struct {
sync.WaitGroup
hasErrors bool
}
func generate(pkg string, deps ...*dependency) *dependency {
var wg dependency
if exclude(pkg) {
return &wg
}
wg.Add(1)
all.Add(1)
go func() {
defer wg.Done()
defer all.Done()
// Wait for dependencies to finish.
for _, d := range deps {
d.Wait()
if d.hasErrors && !*force {
fmt.Printf("--- ABORT: %s\n", pkg)
wg.hasErrors = true
return
}
}
vprintf("=== GENERATE %s\n", pkg)
args := []string{"generate"}
if *verbose {
args = append(args, "-v")
}
args = append(args, pkg)
cmd := exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"), args...)
w := &bytes.Buffer{}
cmd.Stderr = w
cmd.Stdout = w
if err := cmd.Run(); err != nil {
fmt.Printf("--- FAIL: %s:\n\t%v\n\tError: %v\n", pkg, indent(w), err)
hasErrors = true
wg.hasErrors = true
return
}
vprintf("=== TEST %s\n", pkg)
args[0] = "test"
cmd = exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"), args...)
wt := &bytes.Buffer{}
cmd.Stderr = wt
cmd.Stdout = wt
if err := cmd.Run(); err != nil {
fmt.Printf("--- FAIL: %s:\n\t%v\n\tError: %v\n", pkg, indent(wt), err)
hasErrors = true
wg.hasErrors = true
return
}
vprintf("--- SUCCESS: %s\n\t%v\n", pkg, indent(w))
fmt.Print(wt.String())
}()
return &wg
}
// copyExported copies a package in x/text/internal/export to the
// destination repository.
func copyExported(p string) {
copyPackage(
filepath.Join("internal", "export", path.Base(p)),
filepath.Join("..", filepath.FromSlash(p[len("golang.org/x"):])),
"golang.org/x/text/internal/export/"+path.Base(p),
p)
}
// copyVendored copies packages used by Go core into the vendored directory.
func copyVendored() {
root := filepath.Join(build.Default.GOROOT, filepath.FromSlash("src/vendor/golang_org/x"))
err := filepath.Walk(root, func(dir string, info os.FileInfo, err error) error {
if err != nil || !info.IsDir() || root == dir {
return err
}
src := dir[len(root)+1:]
const slash = string(filepath.Separator)
if c := strings.Split(src, slash); c[0] == "text" {
// Copy a text repo package from its normal location.
src = strings.Join(c[1:], slash)
} else {
// Copy the vendored package if it exists in the export directory.
src = filepath.Join("internal", "export", filepath.Base(src))
}
copyPackage(src, dir, "golang.org", "golang_org")
return nil
})
if err != nil {
fmt.Printf("Seeding directory %s has failed %v:", root, err)
os.Exit(1)
}
}
// goGenRE is used to remove go:generate lines.
var goGenRE = regexp.MustCompile("//go:generate[^\n]*\n")
// copyPackage copies relevant files from a directory in x/text to the
// destination package directory. The destination package is assumed to have
// the same name. For each copied file go:generate lines are removed and
// and package comments are rewritten to the new path.
func copyPackage(dirSrc, dirDst, search, replace string) {
err := filepath.Walk(dirSrc, func(file string, info os.FileInfo, err error) error {
base := filepath.Base(file)
if err != nil || info.IsDir() ||
!strings.HasSuffix(base, ".go") ||
strings.HasSuffix(base, "_test.go") && !strings.HasPrefix(base, "example") ||
// Don't process subdirectories.
filepath.Dir(file) != dirSrc {
return nil
}
b, err := ioutil.ReadFile(file)
if err != nil || bytes.Contains(b, []byte("\n// +build ignore")) {
return err
}
// Fix paths.
b = bytes.Replace(b, []byte(search), []byte(replace), -1)
// Remove go:generate lines.
b = goGenRE.ReplaceAllLiteral(b, nil)
comment := "// Code generated by running \"go generate\" in golang.org/x/text. DO NOT EDIT.\n\n"
if *doCore {
comment = "// Code generated by running \"go run gen.go -core\" in golang.org/x/text. DO NOT EDIT.\n\n"
}
if !bytes.HasPrefix(b, []byte(comment)) {
b = append([]byte(comment), b...)
}
if b, err = format.Source(b); err != nil {
fmt.Println("Failed to format file:", err)
os.Exit(1)
}
file = filepath.Join(dirDst, base)
vprintf("=== COPY %s\n", file)
return ioutil.WriteFile(file, b, 0666)
})
if err != nil {
fmt.Println("Copying exported files failed:", err)
os.Exit(1)
}
}
func contains(a []string, s string) bool {
for _, e := range a {
if s == e {
return true
}
}
return false
}
func indent(b *bytes.Buffer) string {
return strings.Replace(strings.TrimSpace(b.String()), "\n", "\n\t", -1)
}
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