• Péter Szilágyi's avatar
    Godeps, vendor: convert dependency management to trash (#3198) · 289b3071
    Péter Szilágyi authored
    This commit converts the dependency management from Godeps to the vendor
    folder, also switching the tool from godep to trash. Since the upstream tool
    lacks a few features proposed via a few PRs, until those PRs are merged in
    (if), use github.com/karalabe/trash.
    
    You can update dependencies via trash --update.
    
    All dependencies have been updated to their latest version.
    
    Parts of the build system are reworked to drop old notions of Godeps and
    invocation of the go vet command so that it doesn't run against the vendor
    folder, as that will just blow up during vetting.
    
    The conversion drops OpenCL (and hence GPU mining support) from ethash and our
    codebase. The short reasoning is that there's noone to maintain and having
    opencl libs in our deps messes up builds as go install ./... tries to build
    them, failing with unsatisfied link errors for the C OpenCL deps.
    
    golang.org/x/net/context is not vendored in. We expect it to be fetched by the
    user (i.e. using go get). To keep ci.go builds reproducible the package is
    "vendored" in build/_vendor.
    289b3071
htmlindex.go 2.52 KB
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:generate go run gen.go

// Package htmlindex maps character set encoding names to Encodings as
// recommended by the W3C for use in HTML 5. See http://www.w3.org/TR/encoding.
package htmlindex

// TODO: perhaps have a "bare" version of the index (used by this package) that
// is not pre-loaded with all encodings. Global variables in encodings prevent
// the linker from being able to purge unneeded tables. This means that
// referencing all encodings, as this package does for the default index, links
// in all encodings unconditionally.
//
// This issue can be solved by either solving the linking issue (see
// https://github.com/golang/go/issues/6330) or refactoring the encoding tables
// (e.g. moving the tables to internal packages that do not use global
// variables).

// TODO: allow canonicalizing names

import (
	"errors"
	"strings"
	"sync"

	"golang.org/x/text/encoding"
	"golang.org/x/text/encoding/internal/identifier"
	"golang.org/x/text/language"
)

var (
	errInvalidName = errors.New("htmlindex: invalid encoding name")
	errUnknown     = errors.New("htmlindex: unknown Encoding")
	errUnsupported = errors.New("htmlindex: this encoding is not supported")
)

var (
	matcherOnce sync.Once
	matcher     language.Matcher
)

// LanguageDefault returns the canonical name of the default encoding for a
// given language.
func LanguageDefault(tag language.Tag) string {
	matcherOnce.Do(func() {
		tags := []language.Tag{}
		for _, t := range strings.Split(locales, " ") {
			tags = append(tags, language.MustParse(t))
		}
		matcher = language.NewMatcher(tags)
	})
	_, i, _ := matcher.Match(tag)
	return canonical[localeMap[i]] // Default is Windows-1252.
}

// Get returns an Encoding for one of the names listed in
// http://www.w3.org/TR/encoding using the Default Index. Matching is case-
// insensitive.
func Get(name string) (encoding.Encoding, error) {
	x, ok := nameMap[strings.ToLower(strings.TrimSpace(name))]
	if !ok {
		return nil, errInvalidName
	}
	return encodings[x], nil
}

// Name reports the canonical name of the given Encoding. It will return
// an error if e is not associated with a supported encoding scheme.
func Name(e encoding.Encoding) (string, error) {
	id, ok := e.(identifier.Interface)
	if !ok {
		return "", errUnknown
	}
	mib, _ := id.ID()
	if mib == 0 {
		return "", errUnknown
	}
	v, ok := mibMap[mib]
	if !ok {
		return "", errUnsupported
	}
	return canonical[v], nil
}