Update dependencies

Among others, this updates minio-go, so that the new "eu-west-3" zone
for AWS is supported.

vendor/golang.org/x/text/message/pipeline/message.go

@@ -0,0 +1,241 @@
+// Copyright 2017 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.
+
+package pipeline
+
+import (
+	"encoding/json"
+	"errors"
+	"strings"
+
+	"golang.org/x/text/language"
+)
+
+// TODO: these definitions should be moved to a package so that the can be used
+// by other tools.
+
+// The file contains the structures used to define translations of a certain
+// messages.
+//
+// A translation may have multiple translations strings, or messages, depending
+// on the feature values of the various arguments. For instance, consider
+// a hypothetical translation from English to English, where the source defines
+// the format string "%d file(s) remaining".
+// See the examples directory for examples of extracted messages.
+
+// Messages is used to store translations for a single language.
+type Messages struct {
+	Language language.Tag    `json:"language"`
+	Messages []Message       `json:"messages"`
+	Macros   map[string]Text `json:"macros,omitempty"`
+}
+
+// A Message describes a message to be translated.
+type Message struct {
+	// ID contains a list of identifiers for the message.
+	ID IDList `json:"id"`
+	// Key is the string that is used to look up the message at runtime.
+	Key         string `json:"key,omitempty"`
+	Meaning     string `json:"meaning,omitempty"`
+	Message     Text   `json:"message"`
+	Translation Text   `json:"translation"`
+
+	Comment           string `json:"comment,omitempty"`
+	TranslatorComment string `json:"translatorComment,omitempty"`
+
+	Placeholders []Placeholder `json:"placeholders,omitempty"`
+
+	// Fuzzy indicates that the provide translation needs review by a
+	// translator, for instance because it was derived from automated
+	// translation.
+	Fuzzy bool `json:"fuzzy,omitempty"`
+
+	// TODO: default placeholder syntax is {foo}. Allow alternative escaping
+	// like `foo`.
+
+	// Extraction information.
+	Position string `json:"position,omitempty"` // filePosition:line
+}
+
+// Placeholder reports the placeholder for the given ID if it is defined or nil
+// otherwise.
+func (m *Message) Placeholder(id string) *Placeholder {
+	for _, p := range m.Placeholders {
+		if p.ID == id {
+			return &p
+		}
+	}
+	return nil
+}
+
+// Substitute replaces placeholders in msg with their original value.
+func (m *Message) Substitute(msg string) (sub string, err error) {
+	last := 0
+	for i := 0; i < len(msg); {
+		pLeft := strings.IndexByte(msg[i:], '{')
+		if pLeft == -1 {
+			break
+		}
+		pLeft += i
+		pRight := strings.IndexByte(msg[pLeft:], '}')
+		if pRight == -1 {
+			return "", errorf("unmatched '}'")
+		}
+		pRight += pLeft
+		id := strings.TrimSpace(msg[pLeft+1 : pRight])
+		i = pRight + 1
+		if id != "" && id[0] == '$' {
+			continue
+		}
+		sub += msg[last:pLeft]
+		last = i
+		ph := m.Placeholder(id)
+		if ph == nil {
+			return "", errorf("unknown placeholder %q in message %q", id, msg)
+		}
+		sub += ph.String
+	}
+	sub += msg[last:]
+	return sub, err
+}
+
+var errIncompatibleMessage = errors.New("messages incompatible")
+
+func checkEquivalence(a, b *Message) error {
+	for _, v := range a.ID {
+		for _, w := range b.ID {
+			if v == w {
+				return nil
+			}
+		}
+	}
+	// TODO: canonicalize placeholders and check for type equivalence.
+	return errIncompatibleMessage
+}
+
+// A Placeholder is a part of the message that should not be changed by a
+// translator. It can be used to hide or prettify format strings (e.g. %d or
+// {{.Count}}), hide HTML, or mark common names that should not be translated.
+type Placeholder struct {
+	// ID is the placeholder identifier without the curly braces.
+	ID string `json:"id"`
+
+	// String is the string with which to replace the placeholder. This may be a
+	// formatting string (for instance "%d" or "{{.Count}}") or a literal string
+	// (<div>).
+	String string `json:"string"`
+
+	Type           string `json:"type"`
+	UnderlyingType string `json:"underlyingType"`
+	// ArgNum and Expr are set if the placeholder is a substitution of an
+	// argument.
+	ArgNum int    `json:"argNum,omitempty"`
+	Expr   string `json:"expr,omitempty"`
+
+	Comment string `json:"comment,omitempty"`
+	Example string `json:"example,omitempty"`
+
+	// Features contains the features that are available for the implementation
+	// of this argument.
+	Features []Feature `json:"features,omitempty"`
+}
+
+// An argument contains information about the arguments passed to a message.
+type argument struct {
+	// ArgNum corresponds to the number that should be used for explicit argument indexes (e.g.
+	// "%[1]d").
+	ArgNum int `json:"argNum,omitempty"`
+
+	used           bool   // Used by Placeholder
+	Type           string `json:"type"`
+	UnderlyingType string `json:"underlyingType"`
+	Expr           string `json:"expr"`
+	Value          string `json:"value,omitempty"`
+	Comment        string `json:"comment,omitempty"`
+	Position       string `json:"position,omitempty"`
+}
+
+// Feature holds information about a feature that can be implemented by
+// an Argument.
+type Feature struct {
+	Type string `json:"type"` // Right now this is only gender and plural.
+
+	// TODO: possible values and examples for the language under consideration.
+
+}
+
+// Text defines a message to be displayed.
+type Text struct {
+	// Msg and Select contains the message to be displayed. Msg may be used as
+	// a fallback value if none of the select cases match.
+	Msg    string  `json:"msg,omitempty"`
+	Select *Select `json:"select,omitempty"`
+
+	// Var defines a map of variables that may be substituted in the selected
+	// message.
+	Var map[string]Text `json:"var,omitempty"`
+
+	// Example contains an example message formatted with default values.
+	Example string `json:"example,omitempty"`
+}
+
+// IsEmpty reports whether this Text can generate anything.
+func (t *Text) IsEmpty() bool {
+	return t.Msg == "" && t.Select == nil && t.Var == nil
+}
+
+// rawText erases the UnmarshalJSON method.
+type rawText Text
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (t *Text) UnmarshalJSON(b []byte) error {
+	if b[0] == '"' {
+		return json.Unmarshal(b, &t.Msg)
+	}
+	return json.Unmarshal(b, (*rawText)(t))
+}
+
+// MarshalJSON implements json.Marshaler.
+func (t *Text) MarshalJSON() ([]byte, error) {
+	if t.Select == nil && t.Var == nil && t.Example == "" {
+		return json.Marshal(t.Msg)
+	}
+	return json.Marshal((*rawText)(t))
+}
+
+// IDList is a set identifiers that each may refer to possibly different
+// versions of the same message. When looking up a messages, the first
+// identifier in the list takes precedence.
+type IDList []string
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (id *IDList) UnmarshalJSON(b []byte) error {
+	if b[0] == '"' {
+		*id = []string{""}
+		return json.Unmarshal(b, &((*id)[0]))
+	}
+	return json.Unmarshal(b, (*[]string)(id))
+}
+
+// MarshalJSON implements json.Marshaler.
+func (id *IDList) MarshalJSON() ([]byte, error) {
+	if len(*id) == 1 {
+		return json.Marshal((*id)[0])
+	}
+	return json.Marshal((*[]string)(id))
+}
+
+// Select selects a Text based on the feature value associated with a feature of
+// a certain argument.
+type Select struct {
+	Feature string          `json:"feature"` // Name of Feature type (e.g plural)
+	Arg     string          `json:"arg"`     // The placeholder ID
+	Cases   map[string]Text `json:"cases"`
+}
+
+// TODO: order matters, but can we derive the ordering from the case keys?
+// type Case struct {
+// 	Key   string `json:"key"`
+// 	Value Text   `json:"value"`
+// }