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utf8: rename some internal constants to remove leading underscores.

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How quaint.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4874045
This commit is contained in:
Rob Pike 2011-08-12 11:50:46 +10:00
parent b1d1da405a
commit 3cca9e0b00
1 changed files with 58 additions and 58 deletions
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116
src/pkg/utf8/utf8.go
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@ -16,22 +16,22 @@ const (
) )
const ( const (
_T1 = 0x00 // 0000 0000 t1 = 0x00 // 0000 0000
_Tx = 0x80 // 1000 0000 tx = 0x80 // 1000 0000
_T2 = 0xC0 // 1100 0000 t2 = 0xC0 // 1100 0000
_T3 = 0xE0 // 1110 0000 t3 = 0xE0 // 1110 0000
_T4 = 0xF0 // 1111 0000 t4 = 0xF0 // 1111 0000
_T5 = 0xF8 // 1111 1000 t5 = 0xF8 // 1111 1000
_Maskx = 0x3F // 0011 1111 maskx = 0x3F // 0011 1111
_Mask2 = 0x1F // 0001 1111 mask2 = 0x1F // 0001 1111
_Mask3 = 0x0F // 0000 1111 mask3 = 0x0F // 0000 1111
_Mask4 = 0x07 // 0000 0111 mask4 = 0x07 // 0000 0111
_Rune1Max = 1<<7 - 1 rune1Max = 1<<7 - 1
_Rune2Max = 1<<11 - 1 rune2Max = 1<<11 - 1
_Rune3Max = 1<<16 - 1 rune3Max = 1<<16 - 1
_Rune4Max = 1<<21 - 1 rune4Max = 1<<21 - 1
) )
func decodeRuneInternal(p []byte) (rune, size int, short bool) { func decodeRuneInternal(p []byte) (rune, size int, short bool) {
@ -42,12 +42,12 @@ func decodeRuneInternal(p []byte) (rune, size int, short bool) {
c0 := p[0] c0 := p[0]
// 1-byte, 7-bit sequence? // 1-byte, 7-bit sequence?
if c0 < _Tx { if c0 < tx {
return int(c0), 1, false return int(c0), 1, false
} }
// unexpected continuation byte? // unexpected continuation byte?
if c0 < _T2 { if c0 < t2 {
return RuneError, 1, false return RuneError, 1, false
} }
@ -56,14 +56,14 @@ func decodeRuneInternal(p []byte) (rune, size int, short bool) {
return RuneError, 1, true return RuneError, 1, true
} }
c1 := p[1] c1 := p[1]
if c1 < _Tx || _T2 <= c1 { if c1 < tx || t2 <= c1 {
return RuneError, 1, false return RuneError, 1, false
} }
// 2-byte, 11-bit sequence? // 2-byte, 11-bit sequence?
if c0 < _T3 { if c0 < t3 {
rune = int(c0&_Mask2)<<6 | int(c1&_Maskx) rune = int(c0&mask2)<<6 | int(c1&maskx)
if rune <= _Rune1Max { if rune <= rune1Max {
return RuneError, 1, false return RuneError, 1, false
} }
return rune, 2, false return rune, 2, false
@ -74,14 +74,14 @@ func decodeRuneInternal(p []byte) (rune, size int, short bool) {
return RuneError, 1, true return RuneError, 1, true
} }
c2 := p[2] c2 := p[2]
if c2 < _Tx || _T2 <= c2 { if c2 < tx || t2 <= c2 {
return RuneError, 1, false return RuneError, 1, false
} }
// 3-byte, 16-bit sequence? // 3-byte, 16-bit sequence?
if c0 < _T4 { if c0 < t4 {
rune = int(c0&_Mask3)<<12 | int(c1&_Maskx)<<6 | int(c2&_Maskx) rune = int(c0&mask3)<<12 | int(c1&maskx)<<6 | int(c2&maskx)
if rune <= _Rune2Max { if rune <= rune2Max {
return RuneError, 1, false return RuneError, 1, false
} }
return rune, 3, false return rune, 3, false
@ -92,14 +92,14 @@ func decodeRuneInternal(p []byte) (rune, size int, short bool) {
return RuneError, 1, true return RuneError, 1, true
} }
c3 := p[3] c3 := p[3]
if c3 < _Tx || _T2 <= c3 { if c3 < tx || t2 <= c3 {
return RuneError, 1, false return RuneError, 1, false
} }
// 4-byte, 21-bit sequence? // 4-byte, 21-bit sequence?
if c0 < _T5 { if c0 < t5 {
rune = int(c0&_Mask4)<<18 | int(c1&_Maskx)<<12 | int(c2&_Maskx)<<6 | int(c3&_Maskx) rune = int(c0&mask4)<<18 | int(c1&maskx)<<12 | int(c2&maskx)<<6 | int(c3&maskx)
if rune <= _Rune3Max { if rune <= rune3Max {
return RuneError, 1, false return RuneError, 1, false
} }
return rune, 4, false return rune, 4, false
@ -117,12 +117,12 @@ func decodeRuneInStringInternal(s string) (rune, size int, short bool) {
c0 := s[0] c0 := s[0]
// 1-byte, 7-bit sequence? // 1-byte, 7-bit sequence?
if c0 < _Tx { if c0 < tx {
return int(c0), 1, false return int(c0), 1, false
} }
// unexpected continuation byte? // unexpected continuation byte?
if c0 < _T2 { if c0 < t2 {
return RuneError, 1, false return RuneError, 1, false
} }
@ -131,14 +131,14 @@ func decodeRuneInStringInternal(s string) (rune, size int, short bool) {
return RuneError, 1, true return RuneError, 1, true
} }
c1 := s[1] c1 := s[1]
if c1 < _Tx || _T2 <= c1 { if c1 < tx || t2 <= c1 {
return RuneError, 1, false return RuneError, 1, false
} }
// 2-byte, 11-bit sequence? // 2-byte, 11-bit sequence?
if c0 < _T3 { if c0 < t3 {
rune = int(c0&_Mask2)<<6 | int(c1&_Maskx) rune = int(c0&mask2)<<6 | int(c1&maskx)
if rune <= _Rune1Max { if rune <= rune1Max {
return RuneError, 1, false return RuneError, 1, false
} }
return rune, 2, false return rune, 2, false
@ -149,14 +149,14 @@ func decodeRuneInStringInternal(s string) (rune, size int, short bool) {
return RuneError, 1, true return RuneError, 1, true
} }
c2 := s[2] c2 := s[2]
if c2 < _Tx || _T2 <= c2 { if c2 < tx || t2 <= c2 {
return RuneError, 1, false return RuneError, 1, false
} }
// 3-byte, 16-bit sequence? // 3-byte, 16-bit sequence?
if c0 < _T4 { if c0 < t4 {
rune = int(c0&_Mask3)<<12 | int(c1&_Maskx)<<6 | int(c2&_Maskx) rune = int(c0&mask3)<<12 | int(c1&maskx)<<6 | int(c2&maskx)
if rune <= _Rune2Max { if rune <= rune2Max {
return RuneError, 1, false return RuneError, 1, false
} }
return rune, 3, false return rune, 3, false
@ -167,14 +167,14 @@ func decodeRuneInStringInternal(s string) (rune, size int, short bool) {
return RuneError, 1, true return RuneError, 1, true
} }
c3 := s[3] c3 := s[3]
if c3 < _Tx || _T2 <= c3 { if c3 < tx || t2 <= c3 {
return RuneError, 1, false return RuneError, 1, false
} }
// 4-byte, 21-bit sequence? // 4-byte, 21-bit sequence?
if c0 < _T5 { if c0 < t5 {
rune = int(c0&_Mask4)<<18 | int(c1&_Maskx)<<12 | int(c2&_Maskx)<<6 | int(c3&_Maskx) rune = int(c0&mask4)<<18 | int(c1&maskx)<<12 | int(c2&maskx)<<6 | int(c3&maskx)
if rune <= _Rune3Max { if rune <= rune3Max {
return RuneError, 1, false return RuneError, 1, false
} }
return rune, 4, false return rune, 4, false
@ -279,13 +279,13 @@ func DecodeLastRuneInString(s string) (rune, size int) {
// RuneLen returns the number of bytes required to encode the rune. // RuneLen returns the number of bytes required to encode the rune.
func RuneLen(rune int) int { func RuneLen(rune int) int {
switch { switch {
case rune <= _Rune1Max: case rune <= rune1Max:
return 1 return 1
case rune <= _Rune2Max: case rune <= rune2Max:
return 2 return 2
case rune <= _Rune3Max: case rune <= rune3Max:
return 3 return 3
case rune <= _Rune4Max: case rune <= rune4Max:
return 4 return 4
} }
return -1 return -1
@ -297,14 +297,14 @@ func EncodeRune(p []byte, rune int) int {
// Negative values are erroneous. Making it unsigned addresses the problem. // Negative values are erroneous. Making it unsigned addresses the problem.
r := uint(rune) r := uint(rune)
if r <= _Rune1Max { if r <= rune1Max {
p[0] = byte(r) p[0] = byte(r)
return 1 return 1
} }
if r <= _Rune2Max { if r <= rune2Max {
p[0] = _T2 | byte(r>>6) p[0] = t2 | byte(r>>6)
p[1] = _Tx | byte(r)&_Maskx p[1] = tx | byte(r)&maskx
return 2 return 2
} }
@ -312,17 +312,17 @@ func EncodeRune(p []byte, rune int) int {
r = RuneError r = RuneError
} }
if r <= _Rune3Max { if r <= rune3Max {
p[0] = _T3 | byte(r>>12) p[0] = t3 | byte(r>>12)
p[1] = _Tx | byte(r>>6)&_Maskx p[1] = tx | byte(r>>6)&maskx
p[2] = _Tx | byte(r)&_Maskx p[2] = tx | byte(r)&maskx
return 3 return 3
} }
p[0] = _T4 | byte(r>>18) p[0] = t4 | byte(r>>18)
p[1] = _Tx | byte(r>>12)&_Maskx p[1] = tx | byte(r>>12)&maskx
p[2] = _Tx | byte(r>>6)&_Maskx p[2] = tx | byte(r>>6)&maskx
p[3] = _Tx | byte(r)&_Maskx p[3] = tx | byte(r)&maskx
return 4 return 4
} }