1 files changed, 107 insertions, 0 deletions
diff --git a/libgo/go/exp/norm/input.go b/libgo/go/exp/norm/input.go
new file mode 100644
index 00000000000..12360a8fda1
--- /dev/null
+++ b/libgo/go/exp/norm/input.go
@@ -0,0 +1,107 @@
+// Copyright 2011 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 norm
+
+import "utf8"
+
+type input interface {
+	skipASCII(p int) int
+	skipNonStarter() int
+	appendSlice(buf []byte, s, e int) []byte
+	copySlice(buf []byte, s, e int)
+	charinfo(p int) (uint16, int)
+	decomposeNFC(p int) uint16
+	decomposeNFKC(p int) uint16
+	hangul(p int) uint32
+}
+
+type inputString string
+
+func (s inputString) skipASCII(p int) int {
+	for ; p < len(s) && s[p] < utf8.RuneSelf; p++ {
+	}
+	return p
+}
+
+func (s inputString) skipNonStarter() int {
+	p := 0
+	for ; p < len(s) && !utf8.RuneStart(s[p]); p++ {
+	}
+	return p
+}
+
+func (s inputString) appendSlice(buf []byte, b, e int) []byte {
+	for i := b; i < e; i++ {
+		buf = append(buf, s[i])
+	}
+	return buf
+}
+
+func (s inputString) copySlice(buf []byte, b, e int) {
+	copy(buf, s[b:e])
+}
+
+func (s inputString) charinfo(p int) (uint16, int) {
+	return charInfoTrie.lookupString(string(s[p:]))
+}
+
+func (s inputString) decomposeNFC(p int) uint16 {
+	return nfcDecompTrie.lookupStringUnsafe(string(s[p:]))
+}
+
+func (s inputString) decomposeNFKC(p int) uint16 {
+	return nfkcDecompTrie.lookupStringUnsafe(string(s[p:]))
+}
+
+func (s inputString) hangul(p int) uint32 {
+	if !isHangulString(string(s[p:])) {
+		return 0
+	}
+	rune, _ := utf8.DecodeRuneInString(string(s[p:]))
+	return uint32(rune)
+}
+
+type inputBytes []byte
+
+func (s inputBytes) skipASCII(p int) int {
+	for ; p < len(s) && s[p] < utf8.RuneSelf; p++ {
+	}
+	return p
+}
+
+func (s inputBytes) skipNonStarter() int {
+	p := 0
+	for ; p < len(s) && !utf8.RuneStart(s[p]); p++ {
+	}
+	return p
+}
+
+func (s inputBytes) appendSlice(buf []byte, b, e int) []byte {
+	return append(buf, s[b:e]...)
+}
+
+func (s inputBytes) copySlice(buf []byte, b, e int) {
+	copy(buf, s[b:e])
+}
+
+func (s inputBytes) charinfo(p int) (uint16, int) {
+	return charInfoTrie.lookup(s[p:])
+}
+
+func (s inputBytes) decomposeNFC(p int) uint16 {
+	return nfcDecompTrie.lookupUnsafe(s[p:])
+}
+
+func (s inputBytes) decomposeNFKC(p int) uint16 {
+	return nfkcDecompTrie.lookupUnsafe(s[p:])
+}
+
+func (s inputBytes) hangul(p int) uint32 {
+	if !isHangul(s[p:]) {
+		return 0
+	}
+	rune, _ := utf8.DecodeRune(s[p:])
+	return uint32(rune)
+}