gemini-browser

A text-based gemini browser
git clone git://git.laack.co/gemini-browser.git
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input.go (2070B)

      1 // Copyright 2011 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package norm
      6 
      7 import "unicode/utf8"
      8 
      9 type input struct {
     10 	str   string
     11 	bytes []byte
     12 }
     13 
     14 func inputBytes(str []byte) input {
     15 	return input{bytes: str}
     16 }
     17 
     18 func inputString(str string) input {
     19 	return input{str: str}
     20 }
     21 
     22 func (in *input) setBytes(str []byte) {
     23 	in.str = ""
     24 	in.bytes = str
     25 }
     26 
     27 func (in *input) setString(str string) {
     28 	in.str = str
     29 	in.bytes = nil
     30 }
     31 
     32 func (in *input) _byte(p int) byte {
     33 	if in.bytes == nil {
     34 		return in.str[p]
     35 	}
     36 	return in.bytes[p]
     37 }
     38 
     39 func (in *input) skipASCII(p, max int) int {
     40 	if in.bytes == nil {
     41 		for ; p < max && in.str[p] < utf8.RuneSelf; p++ {
     42 		}
     43 	} else {
     44 		for ; p < max && in.bytes[p] < utf8.RuneSelf; p++ {
     45 		}
     46 	}
     47 	return p
     48 }
     49 
     50 func (in *input) skipContinuationBytes(p int) int {
     51 	if in.bytes == nil {
     52 		for ; p < len(in.str) && !utf8.RuneStart(in.str[p]); p++ {
     53 		}
     54 	} else {
     55 		for ; p < len(in.bytes) && !utf8.RuneStart(in.bytes[p]); p++ {
     56 		}
     57 	}
     58 	return p
     59 }
     60 
     61 func (in *input) appendSlice(buf []byte, b, e int) []byte {
     62 	if in.bytes != nil {
     63 		return append(buf, in.bytes[b:e]...)
     64 	}
     65 	for i := b; i < e; i++ {
     66 		buf = append(buf, in.str[i])
     67 	}
     68 	return buf
     69 }
     70 
     71 func (in *input) copySlice(buf []byte, b, e int) int {
     72 	if in.bytes == nil {
     73 		return copy(buf, in.str[b:e])
     74 	}
     75 	return copy(buf, in.bytes[b:e])
     76 }
     77 
     78 func (in *input) charinfoNFC(p int) (uint16, int) {
     79 	if in.bytes == nil {
     80 		return nfcData.lookupString(in.str[p:])
     81 	}
     82 	return nfcData.lookup(in.bytes[p:])
     83 }
     84 
     85 func (in *input) charinfoNFKC(p int) (uint16, int) {
     86 	if in.bytes == nil {
     87 		return nfkcData.lookupString(in.str[p:])
     88 	}
     89 	return nfkcData.lookup(in.bytes[p:])
     90 }
     91 
     92 func (in *input) hangul(p int) (r rune) {
     93 	var size int
     94 	if in.bytes == nil {
     95 		if !isHangulString(in.str[p:]) {
     96 			return 0
     97 		}
     98 		r, size = utf8.DecodeRuneInString(in.str[p:])
     99 	} else {
    100 		if !isHangul(in.bytes[p:]) {
    101 			return 0
    102 		}
    103 		r, size = utf8.DecodeRune(in.bytes[p:])
    104 	}
    105 	if size != hangulUTF8Size {
    106 		return 0
    107 	}
    108 	return r
    109 }