1 files changed, 0 insertions, 435 deletions
diff --git a/src/pkg/unicode/utf8/utf8.go b/src/pkg/unicode/utf8/utf8.go
deleted file mode 100644
index 253295ad3..000000000
--- a/src/pkg/unicode/utf8/utf8.go
+++ /dev/null
@@ -1,435 +0,0 @@
-// Copyright 2009 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 utf8 implements functions and constants to support text encoded in
-// UTF-8. It includes functions to translate between runes and UTF-8 byte sequences.
-package utf8
-
-// The conditions RuneError==unicode.ReplacementChar and
-// MaxRune==unicode.MaxRune are verified in the tests.
-// Defining them locally avoids this package depending on package unicode.
-
-// Numbers fundamental to the encoding.
-const (
-	RuneError = '\uFFFD'     // the "error" Rune or "Unicode replacement character"
-	RuneSelf  = 0x80         // characters below Runeself are represented as themselves in a single byte.
-	MaxRune   = '\U0010FFFF' // Maximum valid Unicode code point.
-	UTFMax    = 4            // maximum number of bytes of a UTF-8 encoded Unicode character.
-)
-
-// Code points in the surrogate range are not valid for UTF-8.
-const (
-	surrogateMin = 0xD800
-	surrogateMax = 0xDFFF
-)
-
-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
-)
-
-func decodeRuneInternal(p []byte) (r rune, size int, short bool) {
-	n := len(p)
-	if n < 1 {
-		return RuneError, 0, true
-	}
-	c0 := p[0]
-
-	// 1-byte, 7-bit sequence?
-	if c0 < tx {
-		return rune(c0), 1, false
-	}
-
-	// unexpected continuation byte?
-	if c0 < t2 {
-		return RuneError, 1, false
-	}
-
-	// need first continuation byte
-	if n < 2 {
-		return RuneError, 1, true
-	}
-	c1 := p[1]
-	if c1 < tx || t2 <= c1 {
-		return RuneError, 1, false
-	}
-
-	// 2-byte, 11-bit sequence?
-	if c0 < t3 {
-		r = rune(c0&mask2)<<6 | rune(c1&maskx)
-		if r <= rune1Max {
-			return RuneError, 1, false
-		}
-		return r, 2, false
-	}
-
-	// need second continuation byte
-	if n < 3 {
-		return RuneError, 1, true
-	}
-	c2 := p[2]
-	if c2 < tx || t2 <= c2 {
-		return RuneError, 1, false
-	}
-
-	// 3-byte, 16-bit sequence?
-	if c0 < t4 {
-		r = rune(c0&mask3)<<12 | rune(c1&maskx)<<6 | rune(c2&maskx)
-		if r <= rune2Max {
-			return RuneError, 1, false
-		}
-		if surrogateMin <= r && r <= surrogateMax {
-			return RuneError, 1, false
-		}
-		return r, 3, false
-	}
-
-	// need third continuation byte
-	if n < 4 {
-		return RuneError, 1, true
-	}
-	c3 := p[3]
-	if c3 < tx || t2 <= c3 {
-		return RuneError, 1, false
-	}
-
-	// 4-byte, 21-bit sequence?
-	if c0 < t5 {
-		r = rune(c0&mask4)<<18 | rune(c1&maskx)<<12 | rune(c2&maskx)<<6 | rune(c3&maskx)
-		if r <= rune3Max || MaxRune < r {
-			return RuneError, 1, false
-		}
-		return r, 4, false
-	}
-
-	// error
-	return RuneError, 1, false
-}
-
-func decodeRuneInStringInternal(s string) (r rune, size int, short bool) {
-	n := len(s)
-	if n < 1 {
-		return RuneError, 0, true
-	}
-	c0 := s[0]
-
-	// 1-byte, 7-bit sequence?
-	if c0 < tx {
-		return rune(c0), 1, false
-	}
-
-	// unexpected continuation byte?
-	if c0 < t2 {
-		return RuneError, 1, false
-	}
-
-	// need first continuation byte
-	if n < 2 {
-		return RuneError, 1, true
-	}
-	c1 := s[1]
-	if c1 < tx || t2 <= c1 {
-		return RuneError, 1, false
-	}
-
-	// 2-byte, 11-bit sequence?
-	if c0 < t3 {
-		r = rune(c0&mask2)<<6 | rune(c1&maskx)
-		if r <= rune1Max {
-			return RuneError, 1, false
-		}
-		return r, 2, false
-	}
-
-	// need second continuation byte
-	if n < 3 {
-		return RuneError, 1, true
-	}
-	c2 := s[2]
-	if c2 < tx || t2 <= c2 {
-		return RuneError, 1, false
-	}
-
-	// 3-byte, 16-bit sequence?
-	if c0 < t4 {
-		r = rune(c0&mask3)<<12 | rune(c1&maskx)<<6 | rune(c2&maskx)
-		if r <= rune2Max {
-			return RuneError, 1, false
-		}
-		if surrogateMin <= r && r <= surrogateMax {
-			return RuneError, 1, false
-		}
-		return r, 3, false
-	}
-
-	// need third continuation byte
-	if n < 4 {
-		return RuneError, 1, true
-	}
-	c3 := s[3]
-	if c3 < tx || t2 <= c3 {
-		return RuneError, 1, false
-	}
-
-	// 4-byte, 21-bit sequence?
-	if c0 < t5 {
-		r = rune(c0&mask4)<<18 | rune(c1&maskx)<<12 | rune(c2&maskx)<<6 | rune(c3&maskx)
-		if r <= rune3Max || MaxRune < r {
-			return RuneError, 1, false
-		}
-		return r, 4, false
-	}
-
-	// error
-	return RuneError, 1, false
-}
-
-// FullRune reports whether the bytes in p begin with a full UTF-8 encoding of a rune.
-// An invalid encoding is considered a full Rune since it will convert as a width-1 error rune.
-func FullRune(p []byte) bool {
-	_, _, short := decodeRuneInternal(p)
-	return !short
-}
-
-// FullRuneInString is like FullRune but its input is a string.
-func FullRuneInString(s string) bool {
-	_, _, short := decodeRuneInStringInternal(s)
-	return !short
-}
-
-// DecodeRune unpacks the first UTF-8 encoding in p and returns the rune and its width in bytes.
-// If the encoding is invalid, it returns (RuneError, 1), an impossible result for correct UTF-8.
-// An encoding is invalid if it is incorrect UTF-8, encodes a rune that is
-// out of range, or is not the shortest possible UTF-8 encoding for the
-// value. No other validation is performed.
-func DecodeRune(p []byte) (r rune, size int) {
-	r, size, _ = decodeRuneInternal(p)
-	return
-}
-
-// DecodeRuneInString is like DecodeRune but its input is a string.
-// If the encoding is invalid, it returns (RuneError, 1), an impossible result for correct UTF-8.
-// An encoding is invalid if it is incorrect UTF-8, encodes a rune that is
-// out of range, or is not the shortest possible UTF-8 encoding for the
-// value. No other validation is performed.
-func DecodeRuneInString(s string) (r rune, size int) {
-	r, size, _ = decodeRuneInStringInternal(s)
-	return
-}
-
-// DecodeLastRune unpacks the last UTF-8 encoding in p and returns the rune and its width in bytes.
-// If the encoding is invalid, it returns (RuneError, 1), an impossible result for correct UTF-8.
-// An encoding is invalid if it is incorrect UTF-8, encodes a rune that is
-// out of range, or is not the shortest possible UTF-8 encoding for the
-// value. No other validation is performed.
-func DecodeLastRune(p []byte) (r rune, size int) {
-	end := len(p)
-	if end == 0 {
-		return RuneError, 0
-	}
-	start := end - 1
-	r = rune(p[start])
-	if r < RuneSelf {
-		return r, 1
-	}
-	// guard against O(n^2) behavior when traversing
-	// backwards through strings with long sequences of
-	// invalid UTF-8.
-	lim := end - UTFMax
-	if lim < 0 {
-		lim = 0
-	}
-	for start--; start >= lim; start-- {
-		if RuneStart(p[start]) {
-			break
-		}
-	}
-	if start < 0 {
-		start = 0
-	}
-	r, size = DecodeRune(p[start:end])
-	if start+size != end {
-		return RuneError, 1
-	}
-	return r, size
-}
-
-// DecodeLastRuneInString is like DecodeLastRune but its input is a string.
-// If the encoding is invalid, it returns (RuneError, 1), an impossible result for correct UTF-8.
-// An encoding is invalid if it is incorrect UTF-8, encodes a rune that is
-// out of range, or is not the shortest possible UTF-8 encoding for the
-// value. No other validation is performed.
-func DecodeLastRuneInString(s string) (r rune, size int) {
-	end := len(s)
-	if end == 0 {
-		return RuneError, 0
-	}
-	start := end - 1
-	r = rune(s[start])
-	if r < RuneSelf {
-		return r, 1
-	}
-	// guard against O(n^2) behavior when traversing
-	// backwards through strings with long sequences of
-	// invalid UTF-8.
-	lim := end - UTFMax
-	if lim < 0 {
-		lim = 0
-	}
-	for start--; start >= lim; start-- {
-		if RuneStart(s[start]) {
-			break
-		}
-	}
-	if start < 0 {
-		start = 0
-	}
-	r, size = DecodeRuneInString(s[start:end])
-	if start+size != end {
-		return RuneError, 1
-	}
-	return r, size
-}
-
-// RuneLen returns the number of bytes required to encode the rune.
-// It returns -1 if the rune is not a valid value to encode in UTF-8.
-func RuneLen(r rune) int {
-	switch {
-	case r < 0:
-		return -1
-	case r <= rune1Max:
-		return 1
-	case r <= rune2Max:
-		return 2
-	case surrogateMin <= r && r <= surrogateMax:
-		return -1
-	case r <= rune3Max:
-		return 3
-	case r <= MaxRune:
-		return 4
-	}
-	return -1
-}
-
-// EncodeRune writes into p (which must be large enough) the UTF-8 encoding of the rune.
-// It returns the number of bytes written.
-func EncodeRune(p []byte, r rune) int {
-	// Negative values are erroneous.  Making it unsigned addresses the problem.
-	switch i := uint32(r); {
-	case i <= rune1Max:
-		p[0] = byte(r)
-		return 1
-	case i <= rune2Max:
-		p[0] = t2 | byte(r>>6)
-		p[1] = tx | byte(r)&maskx
-		return 2
-	case i > MaxRune, surrogateMin <= i && i <= surrogateMax:
-		r = RuneError
-		fallthrough
-	case i <= rune3Max:
-		p[0] = t3 | byte(r>>12)
-		p[1] = tx | byte(r>>6)&maskx
-		p[2] = tx | byte(r)&maskx
-		return 3
-	default:
-		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
-	}
-}
-
-// RuneCount returns the number of runes in p.  Erroneous and short
-// encodings are treated as single runes of width 1 byte.
-func RuneCount(p []byte) int {
-	i := 0
-	var n int
-	for n = 0; i < len(p); n++ {
-		if p[i] < RuneSelf {
-			i++
-		} else {
-			_, size := DecodeRune(p[i:])
-			i += size
-		}
-	}
-	return n
-}
-
-// RuneCountInString is like RuneCount but its input is a string.
-func RuneCountInString(s string) (n int) {
-	for range s {
-		n++
-	}
-	return
-}
-
-// RuneStart reports whether the byte could be the first byte of
-// an encoded rune.  Second and subsequent bytes always have the top
-// two bits set to 10.
-func RuneStart(b byte) bool { return b&0xC0 != 0x80 }
-
-// Valid reports whether p consists entirely of valid UTF-8-encoded runes.
-func Valid(p []byte) bool {
-	i := 0
-	for i < len(p) {
-		if p[i] < RuneSelf {
-			i++
-		} else {
-			_, size := DecodeRune(p[i:])
-			if size == 1 {
-				// All valid runes of size 1 (those
-				// below RuneSelf) were handled above.
-				// This must be a RuneError.
-				return false
-			}
-			i += size
-		}
-	}
-	return true
-}
-
-// ValidString reports whether s consists entirely of valid UTF-8-encoded runes.
-func ValidString(s string) bool {
-	for i, r := range s {
-		if r == RuneError {
-			// The RuneError value can be an error
-			// sentinel value (if it's size 1) or the same
-			// value encoded properly. Decode it to see if
-			// it's the 1 byte sentinel value.
-			_, size := DecodeRuneInString(s[i:])
-			if size == 1 {
-				return false
-			}
-		}
-	}
-	return true
-}
-
-// ValidRune reports whether r can be legally encoded as UTF-8.
-// Code points that are out of range or a surrogate half are illegal.
-func ValidRune(r rune) bool {
-	switch {
-	case r < 0:
-		return false
-	case surrogateMin <= r && r <= surrogateMax:
-		return false
-	case r > MaxRune:
-		return false
-	}
-	return true
-}