1 files changed, 0 insertions, 354 deletions
diff --git a/src/pkg/unicode/letter.go b/src/pkg/unicode/letter.go
deleted file mode 100644
index 977bd2b3b..000000000
--- a/src/pkg/unicode/letter.go
+++ /dev/null
@@ -1,354 +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 unicode provides data and functions to test some properties of
-// Unicode code points.
-package unicode
-
-const (
-	MaxRune         = '\U0010FFFF' // Maximum valid Unicode code point.
-	ReplacementChar = '\uFFFD'     // Represents invalid code points.
-	MaxASCII        = '\u007F'     // maximum ASCII value.
-	MaxLatin1       = '\u00FF'     // maximum Latin-1 value.
-)
-
-// RangeTable defines a set of Unicode code points by listing the ranges of
-// code points within the set. The ranges are listed in two slices
-// to save space: a slice of 16-bit ranges and a slice of 32-bit ranges.
-// The two slices must be in sorted order and non-overlapping.
-// Also, R32 should contain only values >= 0x10000 (1<<16).
-type RangeTable struct {
-	R16         []Range16
-	R32         []Range32
-	LatinOffset int // number of entries in R16 with Hi <= MaxLatin1
-}
-
-// Range16 represents of a range of 16-bit Unicode code points.  The range runs from Lo to Hi
-// inclusive and has the specified stride.
-type Range16 struct {
-	Lo     uint16
-	Hi     uint16
-	Stride uint16
-}
-
-// Range32 represents of a range of Unicode code points and is used when one or
-// more of the values will not fit in 16 bits.  The range runs from Lo to Hi
-// inclusive and has the specified stride. Lo and Hi must always be >= 1<<16.
-type Range32 struct {
-	Lo     uint32
-	Hi     uint32
-	Stride uint32
-}
-
-// CaseRange represents a range of Unicode code points for simple (one
-// code point to one code point) case conversion.
-// The range runs from Lo to Hi inclusive, with a fixed stride of 1.  Deltas
-// are the number to add to the code point to reach the code point for a
-// different case for that character.  They may be negative.  If zero, it
-// means the character is in the corresponding case. There is a special
-// case representing sequences of alternating corresponding Upper and Lower
-// pairs.  It appears with a fixed Delta of
-//	{UpperLower, UpperLower, UpperLower}
-// The constant UpperLower has an otherwise impossible delta value.
-type CaseRange struct {
-	Lo    uint32
-	Hi    uint32
-	Delta d
-}
-
-// SpecialCase represents language-specific case mappings such as Turkish.
-// Methods of SpecialCase customize (by overriding) the standard mappings.
-type SpecialCase []CaseRange
-
-// BUG(r): There is no mechanism for full case folding, that is, for
-// characters that involve multiple runes in the input or output.
-
-// Indices into the Delta arrays inside CaseRanges for case mapping.
-const (
-	UpperCase = iota
-	LowerCase
-	TitleCase
-	MaxCase
-)
-
-type d [MaxCase]rune // to make the CaseRanges text shorter
-
-// If the Delta field of a CaseRange is UpperLower, it means
-// this CaseRange represents a sequence of the form (say)
-// Upper Lower Upper Lower.
-const (
-	UpperLower = MaxRune + 1 // (Cannot be a valid delta.)
-)
-
-// linearMax is the maximum size table for linear search for non-Latin1 rune.
-// Derived by running 'go test -calibrate'.
-const linearMax = 18
-
-// is16 reports whether r is in the sorted slice of 16-bit ranges.
-func is16(ranges []Range16, r uint16) bool {
-	if len(ranges) <= linearMax || r <= MaxLatin1 {
-		for i := range ranges {
-			range_ := &ranges[i]
-			if r < range_.Lo {
-				return false
-			}
-			if r <= range_.Hi {
-				return (r-range_.Lo)%range_.Stride == 0
-			}
-		}
-		return false
-	}
-
-	// binary search over ranges
-	lo := 0
-	hi := len(ranges)
-	for lo < hi {
-		m := lo + (hi-lo)/2
-		range_ := &ranges[m]
-		if range_.Lo <= r && r <= range_.Hi {
-			return (r-range_.Lo)%range_.Stride == 0
-		}
-		if r < range_.Lo {
-			hi = m
-		} else {
-			lo = m + 1
-		}
-	}
-	return false
-}
-
-// is32 reports whether r is in the sorted slice of 32-bit ranges.
-func is32(ranges []Range32, r uint32) bool {
-	if len(ranges) <= linearMax {
-		for i := range ranges {
-			range_ := &ranges[i]
-			if r < range_.Lo {
-				return false
-			}
-			if r <= range_.Hi {
-				return (r-range_.Lo)%range_.Stride == 0
-			}
-		}
-		return false
-	}
-
-	// binary search over ranges
-	lo := 0
-	hi := len(ranges)
-	for lo < hi {
-		m := lo + (hi-lo)/2
-		range_ := ranges[m]
-		if range_.Lo <= r && r <= range_.Hi {
-			return (r-range_.Lo)%range_.Stride == 0
-		}
-		if r < range_.Lo {
-			hi = m
-		} else {
-			lo = m + 1
-		}
-	}
-	return false
-}
-
-// Is reports whether the rune is in the specified table of ranges.
-func Is(rangeTab *RangeTable, r rune) bool {
-	r16 := rangeTab.R16
-	if len(r16) > 0 && r <= rune(r16[len(r16)-1].Hi) {
-		return is16(r16, uint16(r))
-	}
-	r32 := rangeTab.R32
-	if len(r32) > 0 && r >= rune(r32[0].Lo) {
-		return is32(r32, uint32(r))
-	}
-	return false
-}
-
-func isExcludingLatin(rangeTab *RangeTable, r rune) bool {
-	r16 := rangeTab.R16
-	if off := rangeTab.LatinOffset; len(r16) > off && r <= rune(r16[len(r16)-1].Hi) {
-		return is16(r16[off:], uint16(r))
-	}
-	r32 := rangeTab.R32
-	if len(r32) > 0 && r >= rune(r32[0].Lo) {
-		return is32(r32, uint32(r))
-	}
-	return false
-}
-
-// IsUpper reports whether the rune is an upper case letter.
-func IsUpper(r rune) bool {
-	// See comment in IsGraphic.
-	if uint32(r) <= MaxLatin1 {
-		return properties[uint8(r)]&pLmask == pLu
-	}
-	return isExcludingLatin(Upper, r)
-}
-
-// IsLower reports whether the rune is a lower case letter.
-func IsLower(r rune) bool {
-	// See comment in IsGraphic.
-	if uint32(r) <= MaxLatin1 {
-		return properties[uint8(r)]&pLmask == pLl
-	}
-	return isExcludingLatin(Lower, r)
-}
-
-// IsTitle reports whether the rune is a title case letter.
-func IsTitle(r rune) bool {
-	if r <= MaxLatin1 {
-		return false
-	}
-	return isExcludingLatin(Title, r)
-}
-
-// to maps the rune using the specified case mapping.
-func to(_case int, r rune, caseRange []CaseRange) rune {
-	if _case < 0 || MaxCase <= _case {
-		return ReplacementChar // as reasonable an error as any
-	}
-	// binary search over ranges
-	lo := 0
-	hi := len(caseRange)
-	for lo < hi {
-		m := lo + (hi-lo)/2
-		cr := caseRange[m]
-		if rune(cr.Lo) <= r && r <= rune(cr.Hi) {
-			delta := rune(cr.Delta[_case])
-			if delta > MaxRune {
-				// In an Upper-Lower sequence, which always starts with
-				// an UpperCase letter, the real deltas always look like:
-				//	{0, 1, 0}    UpperCase (Lower is next)
-				//	{-1, 0, -1}  LowerCase (Upper, Title are previous)
-				// The characters at even offsets from the beginning of the
-				// sequence are upper case; the ones at odd offsets are lower.
-				// The correct mapping can be done by clearing or setting the low
-				// bit in the sequence offset.
-				// The constants UpperCase and TitleCase are even while LowerCase
-				// is odd so we take the low bit from _case.
-				return rune(cr.Lo) + ((r-rune(cr.Lo))&^1 | rune(_case&1))
-			}
-			return r + delta
-		}
-		if r < rune(cr.Lo) {
-			hi = m
-		} else {
-			lo = m + 1
-		}
-	}
-	return r
-}
-
-// To maps the rune to the specified case: UpperCase, LowerCase, or TitleCase.
-func To(_case int, r rune) rune {
-	return to(_case, r, CaseRanges)
-}
-
-// ToUpper maps the rune to upper case.
-func ToUpper(r rune) rune {
-	if r <= MaxASCII {
-		if 'a' <= r && r <= 'z' {
-			r -= 'a' - 'A'
-		}
-		return r
-	}
-	return To(UpperCase, r)
-}
-
-// ToLower maps the rune to lower case.
-func ToLower(r rune) rune {
-	if r <= MaxASCII {
-		if 'A' <= r && r <= 'Z' {
-			r += 'a' - 'A'
-		}
-		return r
-	}
-	return To(LowerCase, r)
-}
-
-// ToTitle maps the rune to title case.
-func ToTitle(r rune) rune {
-	if r <= MaxASCII {
-		if 'a' <= r && r <= 'z' { // title case is upper case for ASCII
-			r -= 'a' - 'A'
-		}
-		return r
-	}
-	return To(TitleCase, r)
-}
-
-// ToUpper maps the rune to upper case giving priority to the special mapping.
-func (special SpecialCase) ToUpper(r rune) rune {
-	r1 := to(UpperCase, r, []CaseRange(special))
-	if r1 == r {
-		r1 = ToUpper(r)
-	}
-	return r1
-}
-
-// ToTitle maps the rune to title case giving priority to the special mapping.
-func (special SpecialCase) ToTitle(r rune) rune {
-	r1 := to(TitleCase, r, []CaseRange(special))
-	if r1 == r {
-		r1 = ToTitle(r)
-	}
-	return r1
-}
-
-// ToLower maps the rune to lower case giving priority to the special mapping.
-func (special SpecialCase) ToLower(r rune) rune {
-	r1 := to(LowerCase, r, []CaseRange(special))
-	if r1 == r {
-		r1 = ToLower(r)
-	}
-	return r1
-}
-
-// caseOrbit is defined in tables.go as []foldPair.  Right now all the
-// entries fit in uint16, so use uint16.  If that changes, compilation
-// will fail (the constants in the composite literal will not fit in uint16)
-// and the types here can change to uint32.
-type foldPair struct {
-	From uint16
-	To   uint16
-}
-
-// SimpleFold iterates over Unicode code points equivalent under
-// the Unicode-defined simple case folding.  Among the code points
-// equivalent to rune (including rune itself), SimpleFold returns the
-// smallest rune > r if one exists, or else the smallest rune >= 0.
-//
-// For example:
-//	SimpleFold('A') = 'a'
-//	SimpleFold('a') = 'A'
-//
-//	SimpleFold('K') = 'k'
-//	SimpleFold('k') = '\u212A' (Kelvin symbol, K)
-//	SimpleFold('\u212A') = 'K'
-//
-//	SimpleFold('1') = '1'
-//
-func SimpleFold(r rune) rune {
-	// Consult caseOrbit table for special cases.
-	lo := 0
-	hi := len(caseOrbit)
-	for lo < hi {
-		m := lo + (hi-lo)/2
-		if rune(caseOrbit[m].From) < r {
-			lo = m + 1
-		} else {
-			hi = m
-		}
-	}
-	if lo < len(caseOrbit) && rune(caseOrbit[lo].From) == r {
-		return rune(caseOrbit[lo].To)
-	}
-
-	// No folding specified.  This is a one- or two-element
-	// equivalence class containing rune and ToLower(rune)
-	// and ToUpper(rune) if they are different from rune.
-	if l := ToLower(r); l != r {
-		return l
-	}
-	return ToUpper(r)
-}