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// 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 "unicode/utf8"

type input interface {
        skipASCII(p int) int
        skipNonStarter(p int) 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) rune
}

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(p int) int {
        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) rune {
        if !isHangulString(string(s[p:])) {
                return 0
        }
        rune, _ := utf8.DecodeRuneInString(string(s[p:]))
        return 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(p int) int {
        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) rune {
        if !isHangul(s[p:]) {
                return 0
        }
        rune, _ := utf8.DecodeRune(s[p:])
        return rune
}