1 files changed, 167 insertions, 0 deletions
diff --git a/src/dma/vendor/golang.org/x/text/internal/language/compose.go b/src/dma/vendor/golang.org/x/text/internal/language/compose.go
new file mode 100644
index 00000000..4ae78e0f
--- /dev/null
+++ b/src/dma/vendor/golang.org/x/text/internal/language/compose.go
@@ -0,0 +1,167 @@
+// Copyright 2018 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 language
+
+import (
+	"sort"
+	"strings"
+)
+
+// A Builder allows constructing a Tag from individual components.
+// Its main user is Compose in the top-level language package.
+type Builder struct {
+	Tag Tag
+
+	private    string // the x extension
+	variants   []string
+	extensions []string
+}
+
+// Make returns a new Tag from the current settings.
+func (b *Builder) Make() Tag {
+	t := b.Tag
+
+	if len(b.extensions) > 0 || len(b.variants) > 0 {
+		sort.Sort(sortVariants(b.variants))
+		sort.Strings(b.extensions)
+
+		if b.private != "" {
+			b.extensions = append(b.extensions, b.private)
+		}
+		n := maxCoreSize + tokenLen(b.variants...) + tokenLen(b.extensions...)
+		buf := make([]byte, n)
+		p := t.genCoreBytes(buf)
+		t.pVariant = byte(p)
+		p += appendTokens(buf[p:], b.variants...)
+		t.pExt = uint16(p)
+		p += appendTokens(buf[p:], b.extensions...)
+		t.str = string(buf[:p])
+		// We may not always need to remake the string, but when or when not
+		// to do so is rather tricky.
+		scan := makeScanner(buf[:p])
+		t, _ = parse(&scan, "")
+		return t
+
+	} else if b.private != "" {
+		t.str = b.private
+		t.RemakeString()
+	}
+	return t
+}
+
+// SetTag copies all the settings from a given Tag. Any previously set values
+// are discarded.
+func (b *Builder) SetTag(t Tag) {
+	b.Tag.LangID = t.LangID
+	b.Tag.RegionID = t.RegionID
+	b.Tag.ScriptID = t.ScriptID
+	// TODO: optimize
+	b.variants = b.variants[:0]
+	if variants := t.Variants(); variants != "" {
+		for _, vr := range strings.Split(variants[1:], "-") {
+			b.variants = append(b.variants, vr)
+		}
+	}
+	b.extensions, b.private = b.extensions[:0], ""
+	for _, e := range t.Extensions() {
+		b.AddExt(e)
+	}
+}
+
+// AddExt adds extension e to the tag. e must be a valid extension as returned
+// by Tag.Extension. If the extension already exists, it will be discarded,
+// except for a -u extension, where non-existing key-type pairs will added.
+func (b *Builder) AddExt(e string) {
+	if e[0] == 'x' {
+		if b.private == "" {
+			b.private = e
+		}
+		return
+	}
+	for i, s := range b.extensions {
+		if s[0] == e[0] {
+			if e[0] == 'u' {
+				b.extensions[i] += e[1:]
+			}
+			return
+		}
+	}
+	b.extensions = append(b.extensions, e)
+}
+
+// SetExt sets the extension e to the tag. e must be a valid extension as
+// returned by Tag.Extension. If the extension already exists, it will be
+// overwritten, except for a -u extension, where the individual key-type pairs
+// will be set.
+func (b *Builder) SetExt(e string) {
+	if e[0] == 'x' {
+		b.private = e
+		return
+	}
+	for i, s := range b.extensions {
+		if s[0] == e[0] {
+			if e[0] == 'u' {
+				b.extensions[i] = e + s[1:]
+			} else {
+				b.extensions[i] = e
+			}
+			return
+		}
+	}
+	b.extensions = append(b.extensions, e)
+}
+
+// AddVariant adds any number of variants.
+func (b *Builder) AddVariant(v ...string) {
+	for _, v := range v {
+		if v != "" {
+			b.variants = append(b.variants, v)
+		}
+	}
+}
+
+// ClearVariants removes any variants previously added, including those
+// copied from a Tag in SetTag.
+func (b *Builder) ClearVariants() {
+	b.variants = b.variants[:0]
+}
+
+// ClearExtensions removes any extensions previously added, including those
+// copied from a Tag in SetTag.
+func (b *Builder) ClearExtensions() {
+	b.private = ""
+	b.extensions = b.extensions[:0]
+}
+
+func tokenLen(token ...string) (n int) {
+	for _, t := range token {
+		n += len(t) + 1
+	}
+	return
+}
+
+func appendTokens(b []byte, token ...string) int {
+	p := 0
+	for _, t := range token {
+		b[p] = '-'
+		copy(b[p+1:], t)
+		p += 1 + len(t)
+	}
+	return p
+}
+
+type sortVariants []string
+
+func (s sortVariants) Len() int {
+	return len(s)
+}
+
+func (s sortVariants) Swap(i, j int) {
+	s[j], s[i] = s[i], s[j]
+}
+
+func (s sortVariants) Less(i, j int) bool {
+	return variantIndex[s[i]] < variantIndex[s[j]]
+}