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Commit 3cca9e0b authored by Rob Pike's avatar Rob Pike
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utf8: rename some internal constants to remove leading underscores. 

How quaint.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4874045
parent b1d1da40
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Showing with 60 additions and 60 deletions
src/pkg/utf8/utf8.go
View file @ 3cca9e0b
......@@ -16,22 +16,22 @@ const (
)
const (
_T1 = 0x00 // 0000 0000
_Tx = 0x80 // 1000 0000
_T2 = 0xC0 // 1100 0000
_T3 = 0xE0 // 1110 0000
_T4 = 0xF0 // 1111 0000
_T5 = 0xF8 // 1111 1000
_Maskx = 0x3F // 0011 1111
_Mask2 = 0x1F // 0001 1111
_Mask3 = 0x0F // 0000 1111
_Mask4 = 0x07 // 0000 0111
_Rune1Max = 1<<7 - 1
_Rune2Max = 1<<11 - 1
_Rune3Max = 1<<16 - 1
_Rune4Max = 1<<21 - 1
t1 = 0x00 // 0000 0000
tx = 0x80 // 1000 0000
t2 = 0xC0 // 1100 0000
t3 = 0xE0 // 1110 0000
t4 = 0xF0 // 1111 0000
t5 = 0xF8 // 1111 1000
maskx = 0x3F // 0011 1111
mask2 = 0x1F // 0001 1111
mask3 = 0x0F // 0000 1111
mask4 = 0x07 // 0000 0111
rune1Max = 1<<7 - 1
rune2Max = 1<<11 - 1
rune3Max = 1<<16 - 1
rune4Max = 1<<21 - 1
)
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]
// 1-byte, 7-bit sequence?
if c0 < _Tx {
if c0 < tx {
return int(c0), 1, false
}
// unexpected continuation byte?
if c0 < _T2 {
if c0 < t2 {
return RuneError, 1, false
}
......@@ -56,14 +56,14 @@ func decodeRuneInternal(p []byte) (rune, size int, short bool) {
return RuneError, 1, true
}
c1 := p[1]
if c1 < _Tx || _T2 <= c1 {
if c1 < tx || t2 <= c1 {
return RuneError, 1, false
}
// 2-byte, 11-bit sequence?
if c0 < _T3 {
rune = int(c0&_Mask2)<<6 | int(c1&_Maskx)
if rune <= _Rune1Max {
if c0 < t3 {
rune = int(c0&mask2)<<6 | int(c1&maskx)
if rune <= rune1Max {
return RuneError, 1, false
}
return rune, 2, false
......@@ -74,14 +74,14 @@ func decodeRuneInternal(p []byte) (rune, size int, short bool) {
return RuneError, 1, true
}
c2 := p[2]
if c2 < _Tx || _T2 <= c2 {
if c2 < tx || t2 <= c2 {
return RuneError, 1, false
}
// 3-byte, 16-bit sequence?
if c0 < _T4 {
rune = int(c0&_Mask3)<<12 | int(c1&_Maskx)<<6 | int(c2&_Maskx)
if rune <= _Rune2Max {
if c0 < t4 {
rune = int(c0&mask3)<<12 | int(c1&maskx)<<6 | int(c2&maskx)
if rune <= rune2Max {
return RuneError, 1, false
}
return rune, 3, false
......@@ -92,14 +92,14 @@ func decodeRuneInternal(p []byte) (rune, size int, short bool) {
return RuneError, 1, true
}
c3 := p[3]
if c3 < _Tx || _T2 <= c3 {
if c3 < tx || t2 <= c3 {
return RuneError, 1, false
}
// 4-byte, 21-bit sequence?
if c0 < _T5 {
rune = int(c0&_Mask4)<<18 | int(c1&_Maskx)<<12 | int(c2&_Maskx)<<6 | int(c3&_Maskx)
if rune <= _Rune3Max {
if c0 < t5 {
rune = int(c0&mask4)<<18 | int(c1&maskx)<<12 | int(c2&maskx)<<6 | int(c3&maskx)
if rune <= rune3Max {
return RuneError, 1, false
}
return rune, 4, false
......@@ -117,12 +117,12 @@ func decodeRuneInStringInternal(s string) (rune, size int, short bool) {
c0 := s[0]
// 1-byte, 7-bit sequence?
if c0 < _Tx {
if c0 < tx {
return int(c0), 1, false
}
// unexpected continuation byte?
if c0 < _T2 {
if c0 < t2 {
return RuneError, 1, false
}
......@@ -131,14 +131,14 @@ func decodeRuneInStringInternal(s string) (rune, size int, short bool) {
return RuneError, 1, true
}
c1 := s[1]
if c1 < _Tx || _T2 <= c1 {
if c1 < tx || t2 <= c1 {
return RuneError, 1, false
}
// 2-byte, 11-bit sequence?
if c0 < _T3 {
rune = int(c0&_Mask2)<<6 | int(c1&_Maskx)
if rune <= _Rune1Max {
if c0 < t3 {
rune = int(c0&mask2)<<6 | int(c1&maskx)
if rune <= rune1Max {
return RuneError, 1, false
}
return rune, 2, false
......@@ -149,14 +149,14 @@ func decodeRuneInStringInternal(s string) (rune, size int, short bool) {
return RuneError, 1, true
}
c2 := s[2]
if c2 < _Tx || _T2 <= c2 {
if c2 < tx || t2 <= c2 {
return RuneError, 1, false
}
// 3-byte, 16-bit sequence?
if c0 < _T4 {
rune = int(c0&_Mask3)<<12 | int(c1&_Maskx)<<6 | int(c2&_Maskx)
if rune <= _Rune2Max {
if c0 < t4 {
rune = int(c0&mask3)<<12 | int(c1&maskx)<<6 | int(c2&maskx)
if rune <= rune2Max {
return RuneError, 1, false
}
return rune, 3, false
......@@ -167,14 +167,14 @@ func decodeRuneInStringInternal(s string) (rune, size int, short bool) {
return RuneError, 1, true
}
c3 := s[3]
if c3 < _Tx || _T2 <= c3 {
if c3 < tx || t2 <= c3 {
return RuneError, 1, false
}
// 4-byte, 21-bit sequence?
if c0 < _T5 {
rune = int(c0&_Mask4)<<18 | int(c1&_Maskx)<<12 | int(c2&_Maskx)<<6 | int(c3&_Maskx)
if rune <= _Rune3Max {
if c0 < t5 {
rune = int(c0&mask4)<<18 | int(c1&maskx)<<12 | int(c2&maskx)<<6 | int(c3&maskx)
if rune <= rune3Max {
return RuneError, 1, 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.
func RuneLen(rune int) int {
switch {
case rune <= _Rune1Max:
case rune <= rune1Max:
return 1
case rune <= _Rune2Max:
case rune <= rune2Max:
return 2
case rune <= _Rune3Max:
case rune <= rune3Max:
return 3
case rune <= _Rune4Max:
case rune <= rune4Max:
return 4
}
return -1
......@@ -297,14 +297,14 @@ func EncodeRune(p []byte, rune int) int {
// Negative values are erroneous. Making it unsigned addresses the problem.
r := uint(rune)
if r <= _Rune1Max {
if r <= rune1Max {
p[0] = byte(r)
return 1
}
if r <= _Rune2Max {
p[0] = _T2 | byte(r>>6)
p[1] = _Tx | byte(r)&_Maskx
if r <= rune2Max {
p[0] = t2 | byte(r>>6)
p[1] = tx | byte(r)&maskx
return 2
}
......@@ -312,17 +312,17 @@ func EncodeRune(p []byte, rune int) int {
r = RuneError
}
if r <= _Rune3Max {
p[0] = _T3 | byte(r>>12)
p[1] = _Tx | byte(r>>6)&_Maskx
p[2] = _Tx | byte(r)&_Maskx
if r <= rune3Max {
p[0] = t3 | byte(r>>12)
p[1] = tx | byte(r>>6)&maskx
p[2] = tx | byte(r)&maskx
return 3
}
p[0] = _T4 | byte(r>>18)
p[1] = _Tx | byte(r>>12)&_Maskx
p[2] = _Tx | byte(r>>6)&_Maskx
p[3] = _Tx | byte(r)&_Maskx
p[0] = t4 | byte(r>>18)
p[1] = tx | byte(r>>12)&maskx
p[2] = tx | byte(r>>6)&maskx
p[3] = tx | byte(r)&maskx
return 4
}
......
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