use pool of segments

cmd/globdraw/main.go

@@ -9,6 +9,7 @@ import (
 	"math/rand"
 	"os"
 	"strings"
+	"unicode/utf8"
 )
 
 func draw(pattern string, m match.Matcher) string {
@@ -60,7 +61,7 @@ func graphviz(m match.Matcher, id string) string {
 
 func main() {
 	pattern := flag.String("p", "", "pattern to draw")
-	sep := flag.String("s", "", "comma separated list of separators")
+	sep := flag.String("s", "", "comma separated list of separators characters")
 	flag.Parse()
 
 	if *pattern == "" {
@@ -68,7 +69,17 @@ func main() {
 		os.Exit(1)
 	}
 
-	glob, err := glob.Compile(*pattern, strings.Split(*sep, ",")...)
+	var separators []rune
+	for _, c := range strings.Split(*sep, ",") {
+		if r, w := utf8.DecodeRuneInString(c); len(c) > w {
+			fmt.Println("only single charactered separators are allowed")
+			os.Exit(1)
+		} else {
+			separators = append(separators, r)
+		}
+	}
+
+	glob, err := glob.Compile(*pattern, separators...)
 	if err != nil {
 		fmt.Println("could not compile pattern:", err)
 		os.Exit(1)

cmd/globtest/main.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"strings"
 	"testing"
+	"unicode/utf8"
 )
 
 func benchString(r testing.BenchmarkResult) string {
@@ -42,7 +43,16 @@ func main() {
 		os.Exit(1)
 	}
 
-	separators := strings.Split(*sep, ",")
+	var separators []rune
+	for _, c := range strings.Split(*sep, ",") {
+		if r, w := utf8.DecodeRuneInString(c); len(c) > w {
+			fmt.Println("only single charactered separators are allowed")
+			os.Exit(1)
+		} else {
+			separators = append(separators, r)
+		}
+	}
+
 	g, err := glob.Compile(*pattern, separators...)
 	if err != nil {
 		fmt.Println("could not compile pattern:", err)

compiler.go

@@ -3,8 +3,8 @@ package glob
 import (
 	"fmt"
 	"github.com/gobwas/glob/match"
+	"github.com/gobwas/glob/runes"
 	"reflect"
-	"unicode/utf8"
 )
 
 func optimize(matcher match.Matcher) match.Matcher {
@@ -23,8 +23,8 @@ func optimize(matcher match.Matcher) match.Matcher {
 		return m
 
 	case match.List:
-		if m.Not == false && utf8.RuneCountInString(m.List) == 1 {
+		if m.Not == false && len(m.List) == 1 {
-			return match.NewText(m.List)
+			return match.NewText(string(m.List))
 		}
 
 		return m
@@ -172,7 +172,7 @@ func glueAsEvery(matchers []match.Matcher) match.Matcher {
 			separator = sep
 		}
 
-		if sep == separator {
+		if runes.Equal(sep, separator) {
 			continue
 		}
 
@@ -187,7 +187,7 @@ func glueAsEvery(matchers []match.Matcher) match.Matcher {
 		return match.Any{separator}
 	}
 
-	if (hasAny || hasSuper) && min > 0 && separator == "" {
+	if (hasAny || hasSuper) && min > 0 && len(separator) == 0 {
 		return match.Min{min}
 	}
 
@@ -201,8 +201,8 @@ func glueAsEvery(matchers []match.Matcher) match.Matcher {
 		}
 	}
 
-	if separator != "" {
+	if len(separator) > 0 {
-		every.Add(match.Contains{separator, true})
+		every.Add(match.Contains{string(separator), true})
 	}
 
 	return every
@@ -468,7 +468,7 @@ func compileMatchers(matchers []match.Matcher) (match.Matcher, error) {
 //	return sum * k
 //}
 
-func doAnyOf(n *nodeAnyOf, s string) (match.Matcher, error) {
+func doAnyOf(n *nodeAnyOf, s []rune) (match.Matcher, error) {
 	var matchers []match.Matcher
 	for _, desc := range n.children() {
 		if desc == nil {
@@ -532,7 +532,7 @@ func do(leaf node, s []rune) (m match.Matcher, err error) {
 		}
 
 	case *nodeList:
-		m = match.List{n.chars, n.not}
+		m = match.List{[]rune(n.chars), n.not}
 
 	case *nodeRange:
 		m = match.Range{n.lo, n.hi, n.not}
@@ -556,7 +556,7 @@ func do(leaf node, s []rune) (m match.Matcher, err error) {
 	return optimize(m), nil
 }
 
-func do2(node node, s string) ([]match.Matcher, error) {
+func do2(node node, s []rune) ([]match.Matcher, error) {
 	var result []match.Matcher
 
 	switch n := node.(type) {
@@ -631,7 +631,7 @@ func do2(node node, s string) ([]match.Matcher, error) {
 		}
 
 	case *nodeList:
-		result = append(result, match.List{n.chars, n.not})
+		result = append(result, match.List{[]rune(n.chars), n.not})
 
 	case *nodeRange:
 		result = append(result, match.Range{n.lo, n.hi, n.not})

compiler_test.go

@@ -6,7 +6,7 @@ import (
 	"testing"
 )
 
-const separators = "."
+var separators = []rune{'.'}
 
 func TestGlueMatchers(t *testing.T) {
 	for id, test := range []struct {
@@ -27,7 +27,7 @@ func TestGlueMatchers(t *testing.T) {
 			},
 			match.EveryOf{match.Matchers{
 				match.Min{1},
-				match.Contains{separators, true},
+				match.Contains{string(separators), true},
 			}},
 		},
 		{
@@ -43,8 +43,8 @@ func TestGlueMatchers(t *testing.T) {
 		},
 		{
 			[]match.Matcher{
-				match.List{"a", true},
+				match.List{[]rune{'a'}, true},
-				match.Any{"a"},
+				match.Any{[]rune{'a'}},
 			},
 			match.EveryOf{match.Matchers{
 				match.Min{1},
@@ -101,14 +101,14 @@ func TestCompileMatchers(t *testing.T) {
 		{
 			[]match.Matcher{
 				match.Range{'a', 'c', true},
-				match.List{"zte", false},
+				match.List{[]rune{'z', 't', 'e'}, false},
 				match.NewText("c"),
 				match.Single{},
 			},
 			match.Row{
 				Matchers: match.Matchers{
 					match.Range{'a', 'c', true},
-					match.List{"zte", false},
+					match.List{[]rune{'z', 't', 'e'}, false},
 					match.NewText("c"),
 					match.Single{},
 				},
@@ -136,7 +136,7 @@ func TestConvertMatchers(t *testing.T) {
 		{
 			[]match.Matcher{
 				match.Range{'a', 'c', true},
-				match.List{"zte", false},
+				match.List{[]rune{'z', 't', 'e'}, false},
 				match.NewText("c"),
 				match.Single{},
 				match.Any{},
@@ -145,7 +145,7 @@ func TestConvertMatchers(t *testing.T) {
 				match.Row{
 					Matchers: match.Matchers{
 						match.Range{'a', 'c', true},
-						match.List{"zte", false},
+						match.List{[]rune{'z', 't', 'e'}, false},
 						match.NewText("c"),
 						match.Single{},
 					},
@@ -157,7 +157,7 @@ func TestConvertMatchers(t *testing.T) {
 		{
 			[]match.Matcher{
 				match.Range{'a', 'c', true},
-				match.List{"zte", false},
+				match.List{[]rune{'z', 't', 'e'}, false},
 				match.NewText("c"),
 				match.Single{},
 				match.Any{},
@@ -169,7 +169,7 @@ func TestConvertMatchers(t *testing.T) {
 				match.Row{
 					Matchers: match.Matchers{
 						match.Range{'a', 'c', true},
-						match.List{"zte", false},
+						match.List{[]rune{'z', 't', 'e'}, false},
 						match.NewText("c"),
 					},
 					RunesLength: 3,
@@ -204,7 +204,7 @@ func TestCompiler(t *testing.T) {
 	for id, test := range []struct {
 		ast    *nodePattern
 		result Glob
-		sep    string
+		sep    []rune
 	}{
 		{
 			ast:    pattern(&nodeText{text: "abc"}),
@@ -241,14 +241,14 @@ func TestCompiler(t *testing.T) {
 				chars: "abc",
 				not:   true,
 			}),
-			result: match.List{"abc", true},
+			result: match.List{[]rune{'a', 'b', 'c'}, true},
 		},
 		{
 			ast: pattern(&nodeAny{}, &nodeSingle{}, &nodeSingle{}, &nodeSingle{}),
 			sep: separators,
 			result: match.EveryOf{Matchers: match.Matchers{
 				match.Min{3},
-				match.Contains{separators, true},
+				match.Contains{string(separators), true},
 			}},
 		},
 		{
@@ -349,7 +349,7 @@ func TestCompiler(t *testing.T) {
 				nil,
 				match.AnyOf{Matchers: match.Matchers{
 					match.Single{},
-					match.List{List: "def"},
+					match.List{List: []rune{'d', 'e', 'f'}},
 					match.Nothing{},
 				}},
 			),
@@ -390,8 +390,8 @@ func TestCompiler(t *testing.T) {
 				Matchers: match.Matchers{
 					match.NewText("abc"),
 					match.AnyOf{Matchers: match.Matchers{
-						match.List{List: "abc"},
+						match.List{List: []rune{'a', 'b', 'c'}},
-						match.List{List: "def"},
+						match.List{List: []rune{'d', 'e', 'f'}},
 					}},
 					match.NewText("ghi"),
 				},

glob.go

@@ -1,7 +1,5 @@
 package glob
 
-import "strings"
-
 // Glob represents compiled glob pattern.
 type Glob interface {
 	Match(string) bool
@@ -48,7 +46,7 @@ func Compile(pattern string, separators ...rune) (Glob, error) {
 }
 
 // MustCompile is the same as Compile, except that if Compile returns error, this will panic
-func MustCompile(pattern string, separators ...string) Glob {
+func MustCompile(pattern string, separators ...rune) Glob {
 	g, err := Compile(pattern, separators...)
 	if err != nil {
 		panic(err)

glob_test.go

@@ -53,10 +53,10 @@ const (
 type test struct {
 	pattern, match string
 	should         bool
-	delimiters     []string
+	delimiters     []rune
 }
 
-func glob(s bool, p, m string, d ...string) test {
+func glob(s bool, p, m string, d ...rune) test {
 	return test{p, m, s, d}
 }
 
@@ -68,22 +68,22 @@ func TestGlob(t *testing.T) {
 		glob(true, "a*c", "abc"),
 		glob(true, "a*c", "a12345c"),
 		glob(true, "a?c", "a1c"),
-		glob(true, "a.b", "a.b", "."),
+		glob(true, "a.b", "a.b", '.'),
-		glob(true, "a.*", "a.b", "."),
+		glob(true, "a.*", "a.b", '.'),
-		glob(true, "a.**", "a.b.c", "."),
+		glob(true, "a.**", "a.b.c", '.'),
-		glob(true, "a.?.c", "a.b.c", "."),
+		glob(true, "a.?.c", "a.b.c", '.'),
-		glob(true, "a.?.?", "a.b.c", "."),
+		glob(true, "a.?.?", "a.b.c", '.'),
 		glob(true, "?at", "cat"),
 		glob(true, "?at", "fat"),
 		glob(true, "*", "abc"),
 		glob(true, `\*`, "*"),
-		glob(true, "**", "a.b.c", "."),
+		glob(true, "**", "a.b.c", '.'),
 
 		glob(false, "?at", "at"),
-		glob(false, "?at", "fat", "f"),
+		glob(false, "?at", "fat", 'f'),
-		glob(false, "a.*", "a.b.c", "."),
+		glob(false, "a.*", "a.b.c", '.'),
-		glob(false, "a.?.c", "a.bb.c", "."),
+		glob(false, "a.?.c", "a.bb.c", '.'),
-		glob(false, "*", "a.b.c", "."),
+		glob(false, "*", "a.b.c", '.'),
 
 		glob(true, "*test", "this is a test"),
 		glob(true, "this*", "this is a test"),

match/any.go

@@ -2,8 +2,7 @@ package match
 
 import (
 	"fmt"
-	"strings"
+	"github.com/gobwas/glob/strings"
-	"unicode/utf8"
 )
 
 type Any struct {
@@ -11,28 +10,25 @@ type Any struct {
 }
 
 func (self Any) Match(s string) bool {
-	return strings.IndexAny(s, self.Separators) == -1
+	return strings.IndexAnyRunes(s, self.Separators) == -1
 }
 
-func (self Any) Index(s string) (int, []int) {
+func (self Any) Index(s string, segments []int) (int, []int) {
-	var sub string
+	found := strings.IndexAnyRunes(s, self.Separators)
-
-	found := strings.IndexAny(s, self.Separators)
 	switch found {
 	case -1:
-		sub = s
 	case 0:
-		return 0, []int{0}
+		segments = append(segments)
+		return 0, segments
 	default:
-		sub = s[:found]
+		s = s[:found]
 	}
 
-	segments := make([]int, 0, utf8.RuneCountInString(sub)+1)
+	for i := range s {
-	for i := range sub {
 		segments = append(segments, i)
 	}
 
-	segments = append(segments, len(sub))
+	segments = append(segments, len(s))
 
 	return 0, segments
 }

match/any_of.go

@@ -23,39 +23,38 @@ func (self AnyOf) Match(s string) bool {
 	return false
 }
 
-func (self AnyOf) Index(s string) (int, []int) {
+func (self AnyOf) Index(s string, segments []int) (int, []int) {
-	if len(self.Matchers) == 0 {
-		return -1, nil
-	}
-
-	// segments to merge
-	var segments [][]int
 	index := -1
-
 	for _, m := range self.Matchers {
-		idx, seg := m.Index(s)
+		in := acquireSegments(len(s))
+		idx, seg := m.Index(s, in)
 		if idx == -1 {
+			releaseSegments(in)
 			continue
 		}
 
 		if index == -1 || idx < index {
 			index = idx
-			segments = [][]int{seg}
+			segments = append(segments[:0], seg...)
+			releaseSegments(in)
 			continue
 		}
 
 		if idx > index {
+			releaseSegments(in)
 			continue
 		}
 
-		segments = append(segments, seg)
+		// here idx == index
+		segments = appendMerge(segments, seg)
+		releaseSegments(in)
 	}
 
 	if index == -1 {
 		return -1, nil
 	}
 
-	return index, mergeSegments(segments)
+	return index, segments
 }
 
 func (self AnyOf) Len() (l int) {

match/any_of_test.go

@@ -33,8 +33,8 @@ func TestAnyOfIndex(t *testing.T) {
 		},
 		{
 			Matchers{
-				List{"[def]", false},
+				List{[]rune("[def]"), false},
-				List{"[abc]", false},
+				List{[]rune("[abc]"), false},
 			},
 			"abcdef",
 			0,
@@ -42,7 +42,7 @@ func TestAnyOfIndex(t *testing.T) {
 		},
 	} {
 		everyOf := AnyOf{test.matchers}
-		index, segments := everyOf.Index(test.fixture)
+		index, segments := everyOf.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}

match/any_test.go

@@ -7,38 +7,53 @@ import (
 
 func TestAnyIndex(t *testing.T) {
 	for id, test := range []struct {
-		sep      string
+		sep      []rune
 		fixture  string
 		index    int
 		segments []int
 	}{
 		{
-			".",
+			[]rune{'.'},
 			"abc",
 			0,
 			[]int{0, 1, 2, 3},
 		},
 		{
-			".",
+			[]rune{'.'},
 			"abc.def",
 			0,
 			[]int{0, 1, 2, 3},
 		},
 	} {
 		p := Any{test.sep}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
 		if !reflect.DeepEqual(segments, test.segments) {
 			t.Errorf("#%d unexpected segments: exp: %v, act: %v", id, test.segments, segments)
 		}
+
+		releaseSegments(segments)
 	}
 }
 
 func BenchmarkIndexAny(b *testing.B) {
-	p := Any{bench_separators}
+	m := Any{bench_separators}
+
+	in := acquireSegments(len(bench_pattern))
 	for i := 0; i < b.N; i++ {
-		p.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexAnyParallel(b *testing.B) {
+	m := Any{bench_separators}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/btree.go

@@ -51,7 +51,7 @@ func (self BTree) Len() int {
 }
 
 // todo?
-func (self BTree) Index(s string) (int, []int) {
+func (self BTree) Index(s string, segments []int) (int, []int) {
 	return -1, nil
 }
 
@@ -79,8 +79,10 @@ func (self BTree) Match(s string) bool {
 
 	for offset < limit {
 		// search for matching part in substring
-		index, segments := self.Value.Index(s[offset:limit])
+		in := acquireSegments(limit - offset)
+		index, segments := self.Value.Index(s[offset:limit], in)
 		if index == -1 {
+			releaseSegments(in)
 			return false
 		}
 
@@ -112,11 +114,14 @@ func (self BTree) Match(s string) bool {
 				}
 
 				if right {
+					releaseSegments(in)
 					return true
 				}
 			}
 		}
 
+		releaseSegments(in)
+
 		_, step := utf8.DecodeRuneInString(s[offset+index:])
 		offset += index + step
 	}

match/contains.go

@@ -3,7 +3,6 @@ package match
 import (
 	"fmt"
 	"strings"
-	"unicode/utf8"
 )
 
 type Contains struct {
@@ -15,11 +14,8 @@ func (self Contains) Match(s string) bool {
 	return strings.Contains(s, self.Needle) != self.Not
 }
 
-func (self Contains) Index(s string) (int, []int) {
+func (self Contains) Index(s string, segments []int) (int, []int) {
-	var (
+	var offset int
-		sub    string
-		offset int
-	)
 
 	idx := strings.Index(s, self.Needle)
 
@@ -29,27 +25,19 @@ func (self Contains) Index(s string) (int, []int) {
 		}
 
 		offset = idx + len(self.Needle)
-
 		if len(s) <= offset {
-			return 0, []int{offset}
+			return 0, append(segments, offset)
+		}
+		s = s[offset:]
+	} else if idx != -1 {
+		s = s[:idx]
 	}
 
-		sub = s[offset:]
+	for i, _ := range s {
-	} else {
-		switch idx {
-		case -1:
-			sub = s
-		default:
-			sub = s[:idx]
-		}
-	}
-
-	segments := make([]int, 0, utf8.RuneCountInString(sub)+1)
-	for i, _ := range sub {
 		segments = append(segments, offset+i)
 	}
 
-	return 0, append(segments, offset+len(sub))
+	return 0, append(segments, offset+len(s))
 }
 
 func (self Contains) Len() int {

match/contains_test.go

@@ -43,7 +43,7 @@ func TestContainsIndex(t *testing.T) {
 		},
 	} {
 		p := Contains{test.prefix, test.not}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -54,8 +54,21 @@ func TestContainsIndex(t *testing.T) {
 }
 
 func BenchmarkIndexContains(b *testing.B) {
-	m := Contains{bench_separators, true}
+	m := Contains{string(bench_separators), true}
+
+	in := acquireSegments(len(bench_pattern))
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexContainsParallel(b *testing.B) {
+	m := Contains{string(bench_separators), true}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/every_of.go

@@ -25,43 +25,66 @@ func (self EveryOf) Len() (l int) {
 	return
 }
 
-func (self EveryOf) Index(s string) (int, []int) {
+func max(a, b int) int {
+	if a >= b {
+		return a
+	}
+
+	return b
+}
+
+func (self EveryOf) Index(s string, out []int) (int, []int) {
 	var index int
 	var offset int
-	var segments []int
+	var current []int
 
 	sub := s
-	for _, m := range self.Matchers {
+	for i, m := range self.Matchers {
-		idx, seg := m.Index(sub)
+		in := acquireSegments(len(sub))
+		idx, seg := m.Index(sub, in)
 		if idx == -1 {
+			releaseSegments(in)
+			if cap(current) > 0 {
+				releaseSegments(current)
+			}
 			return -1, nil
 		}
 
-		var sum []int
+		next := acquireSegments(max(len(seg), len(current)))
-		if segments == nil {
+		if i == 0 {
-			sum = seg
+			next = append(next, seg...)
 		} else {
 			delta := index - (idx + offset)
-			for _, ex := range segments {
+			for _, ex := range current {
 				for _, n := range seg {
 					if ex+delta == n {
-						sum = append(sum, n)
+						next = append(next, n)
 					}
 				}
 			}
 		}
 
-		if len(sum) == 0 {
+		if cap(current) > 0 {
+			releaseSegments(current)
+		}
+		releaseSegments(in)
+
+		if len(next) == 0 {
+			releaseSegments(next)
 			return -1, nil
 		}
 
-		segments = sum
+		current = next
+
 		index = idx + offset
 		sub = s[index:]
 		offset += idx
 	}
 
-	return index, segments
+	out = append(out, current...)
+	releaseSegments(current)
+
+	return index, out
 }
 
 func (self EveryOf) Match(s string) bool {

match/every_of_test.go

@@ -34,7 +34,7 @@ func TestEveryOfIndex(t *testing.T) {
 		},
 	} {
 		everyOf := EveryOf{test.matchers}
-		index, segments := everyOf.Index(test.fixture)
+		index, segments := everyOf.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}

match/list.go

@@ -2,24 +2,22 @@ package match
 
 import (
 	"fmt"
-	"strings"
+	"github.com/gobwas/glob/runes"
 	"unicode/utf8"
 )
 
 type List struct {
-	List string
+	List []rune
 	Not  bool
 }
 
 func (self List) Match(s string) bool {
-	// if s 100% have two symbols
+	r, w := utf8.DecodeRuneInString(s)
-	//	_, w := utf8.DecodeRuneInString(s)
+	if len(s) > w {
-	//	if len(s) > w {
-	if len(s) > 4 {
 		return false
 	}
 
-	inList := strings.Index(self.List, s) != -1
+	inList := runes.IndexRune(self.List, r) != -1
 	return inList == !self.Not
 }
 
@@ -27,10 +25,10 @@ func (self List) Len() int {
 	return lenOne
 }
 
-func (self List) Index(s string) (int, []int) {
+func (self List) Index(s string, segments []int) (int, []int) {
 	for i, r := range s {
-		if self.Not == (strings.IndexRune(self.List, r) == -1) {
+		if self.Not == (runes.IndexRune(self.List, r) == -1) {
-			return i, []int{utf8.RuneLen(r)}
+			return i, append(segments, utf8.RuneLen(r))
 		}
 	}
 

match/list_test.go

@@ -7,21 +7,21 @@ import (
 
 func TestListIndex(t *testing.T) {
 	for id, test := range []struct {
-		list     string
+		list     []rune
 		not      bool
 		fixture  string
 		index    int
 		segments []int
 	}{
 		{
-			"ab",
+			[]rune("ab"),
 			false,
 			"abc",
 			0,
 			[]int{1},
 		},
 		{
-			"ab",
+			[]rune("ab"),
 			true,
 			"fffabfff",
 			0,
@@ -29,7 +29,7 @@ func TestListIndex(t *testing.T) {
 		},
 	} {
 		p := List{test.list, test.not}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -40,8 +40,21 @@ func TestListIndex(t *testing.T) {
 }
 
 func BenchmarkIndexList(b *testing.B) {
-	m := List{"def", false}
+	m := List{[]rune("def"), false}
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexListParallel(b *testing.B) {
+	m := List{[]rune("def"), false}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/match.go

@@ -3,6 +3,7 @@ package match
 import (
 	"fmt"
 	"strings"
+	"sync"
 )
 
 const lenOne = 1
@@ -11,7 +12,7 @@ const lenNo = -1
 
 type Matcher interface {
 	Match(string) bool
-	Index(string) (int, []int)
+	Index(string, []int) (int, []int)
 	Len() int
 	String() string
 }
@@ -27,6 +28,58 @@ func (m Matchers) String() string {
 	return fmt.Sprintf("%s", strings.Join(s, ","))
 }
 
+var segmentsPools [1024]sync.Pool
+
+func toPowerOfTwo(v int) int {
+	v--
+	v |= v >> 1
+	v |= v >> 2
+	v |= v >> 4
+	v |= v >> 8
+	v |= v >> 16
+	v++
+
+	return v
+}
+
+func init() {
+	for i := 1024; i >= 1; i >>= 1 {
+		func(i int) {
+			segmentsPools[i-1] = sync.Pool{
+				New: func() interface{} {
+					return make([]int, 0, i)
+				},
+			}
+		}(i)
+	}
+}
+
+var segmentsPool = sync.Pool{
+	New: func() interface{} {
+		return make([]int, 0, 64)
+	},
+}
+
+func getIdx(c int) int {
+	p := toPowerOfTwo(c)
+	switch {
+	case p >= 1024:
+		return 1023
+	case p < 1:
+		return 0
+	default:
+		return p - 1
+	}
+}
+
+func acquireSegments(c int) []int {
+	return segmentsPools[getIdx(c)].Get().([]int)[:0]
+}
+
+func releaseSegments(s []int) {
+	segmentsPools[getIdx(cap(s))].Put(s)
+}
+
 func appendIfNotAsPrevious(target []int, val int) []int {
 	l := len(target)
 	if l != 0 && target[l-1] == val {
@@ -36,16 +89,64 @@ func appendIfNotAsPrevious(target []int, val int) []int {
 	return append(target, val)
 }
 
-// mergeSegments merges and sorts given already SORTED and UNIQUE segments.
+func appendMerge(target, sub []int) []int {
-func mergeSegments(segments [][]int) []int {
+	lt, ls := len(target), len(sub)
-	var current []int
+	out := acquireSegments(lt + ls)
-	for _, s := range segments {
+
-		if current == nil {
+	for x, y := 0, 0; x < lt || y < ls; {
-			current = s
+		if x >= lt {
-			continue
+			out = append(out, sub[y:]...)
+			break
 		}
 
-		var next []int
+		if y >= ls {
+			out = append(out, target[x:]...)
+			break
+		}
+
+		xValue := target[x]
+		yValue := sub[y]
+
+		switch {
+
+		case xValue == yValue:
+			out = append(out, xValue)
+			x++
+			y++
+
+		case xValue < yValue:
+			out = append(out, xValue)
+			x++
+
+		case yValue < xValue:
+			out = append(out, yValue)
+			y++
+
+		}
+	}
+
+	target = append(target[:0], out...)
+	releaseSegments(out)
+
+	return target
+}
+
+// mergeSegments merges and sorts given already SORTED and UNIQUE segments.
+func mergeSegments(list [][]int, out []int) []int {
+	var current []int
+	switch len(list) {
+	case 0:
+		return out
+	case 1:
+		return list[0]
+	default:
+		current = acquireSegments(len(list[0]))
+		current = append(current, list[0]...)
+		//		releaseSegments(list[0])
+	}
+
+	for _, s := range list[1:] {
+		next := acquireSegments(len(current) + len(s))
 		for x, y := 0, 0; x < len(current) || y < len(s); {
 			if x >= len(current) {
 				next = append(next, s[y:]...)
@@ -78,8 +179,21 @@ func mergeSegments(segments [][]int) []int {
 			}
 		}
 
+		releaseSegments(current)
 		current = next
 	}
 
-	return current
+	out = append(out, current...)
+	releaseSegments(current)
+
+	return out
+}
+
+func reverseSegments(input []int) {
+	l := len(input)
+	m := l / 2
+
+	for i := 0; i < m; i++ {
+		input[i], input[l-i-1] = input[l-i-1], input[i]
+	}
 }

match/match_test.go

@@ -5,36 +5,60 @@ import (
 	"testing"
 )
 
-const bench_separators = "."
+var bench_separators = []rune{'.'}
+
 const bench_pattern = "abcdefghijklmnopqrstuvwxyz0123456789"
 
-func TestMergeSegments(t *testing.T) {
+func TestAppendMerge(t *testing.T) {
 	for id, test := range []struct {
-		segments [][]int
+		segments [2][]int
 		exp      []int
 	}{
 		{
-			[][]int{
+			[2][]int{
 				[]int{0, 6, 7},
 				[]int{0, 1, 3},
-				[]int{2, 4},
 			},
-			[]int{0, 1, 2, 3, 4, 6, 7},
+			[]int{0, 1, 3, 6, 7},
 		},
 		{
-			[][]int{
+			[2][]int{
 				[]int{0, 1, 3, 6, 7},
-				[]int{0, 1, 3},
+				[]int{0, 1, 10},
-				[]int{2, 4},
-				[]int{1},
 			},
-			[]int{0, 1, 2, 3, 4, 6, 7},
+			[]int{0, 1, 3, 6, 7, 10},
 		},
 	} {
-		act := mergeSegments(test.segments)
+		act := appendMerge(test.segments[0], test.segments[1])
 		if !reflect.DeepEqual(act, test.exp) {
 			t.Errorf("#%d merge sort segments unexpected:\nact: %v\nexp:%v", id, act, test.exp)
 			continue
 		}
 	}
 }
+
+func BenchmarkAppendMerge(b *testing.B) {
+	s1 := []int{0, 1, 3, 6, 7}
+	s2 := []int{0, 1, 3}
+
+	for i := 0; i < b.N; i++ {
+		appendMerge(s1, s2)
+	}
+}
+
+func BenchmarkAppendMergeParallel(b *testing.B) {
+	s1 := []int{0, 1, 3, 6, 7}
+	s2 := []int{0, 1, 3}
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			appendMerge(s1, s2)
+		}
+	})
+}
+
+func BenchmarkReverse(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		reverseSegments([]int{1, 2, 3, 4})
+	}
+}

match/max.go

@@ -21,7 +21,7 @@ func (self Max) Match(s string) bool {
 	return true
 }
 
-func (self Max) Index(s string) (index int, segments []int) {
+func (self Max) Index(s string, segments []int) (int, []int) {
 	segments = append(segments, 0)
 	var count int
 	for i, r := range s {

match/max_test.go

@@ -26,7 +26,7 @@ func TestMaxIndex(t *testing.T) {
 		},
 	} {
 		p := Max{test.limit}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -38,7 +38,20 @@ func TestMaxIndex(t *testing.T) {
 
 func BenchmarkIndexMax(b *testing.B) {
 	m := Max{10}
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexMaxParallel(b *testing.B) {
+	m := Max{10}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/min.go

@@ -21,22 +21,22 @@ func (self Min) Match(s string) bool {
 	return false
 }
 
-func (self Min) Index(s string) (int, []int) {
+func (self Min) Index(s string, segments []int) (int, []int) {
 	var count int
+	var found bool
 
-	c := utf8.RuneCountInString(s)
-	if c < self.Limit {
-		return -1, nil
-	}
-
-	segments := make([]int, 0, c-self.Limit+1)
 	for i, r := range s {
 		count++
 		if count >= self.Limit {
+			found = true
 			segments = append(segments, i+utf8.RuneLen(r))
 		}
 	}
 
+	if !found {
+		return -1, nil
+	}
+
 	return 0, segments
 }
 

match/min_test.go

@@ -26,7 +26,7 @@ func TestMinIndex(t *testing.T) {
 		},
 	} {
 		p := Min{test.limit}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -38,7 +38,20 @@ func TestMinIndex(t *testing.T) {
 
 func BenchmarkIndexMin(b *testing.B) {
 	m := Min{10}
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexMinParallel(b *testing.B) {
+	m := Min{10}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/nothing.go

@@ -10,8 +10,8 @@ func (self Nothing) Match(s string) bool {
 	return len(s) == 0
 }
 
-func (self Nothing) Index(s string) (int, []int) {
+func (self Nothing) Index(s string, segments []int) (int, []int) {
-	return 0, []int{0}
+	return 0, append(segments, 0)
 }
 
 func (self Nothing) Len() int {

match/nothing_test.go

@@ -23,7 +23,7 @@ func TestNothingIndex(t *testing.T) {
 		},
 	} {
 		p := Nothing{}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -34,8 +34,21 @@ func TestNothingIndex(t *testing.T) {
 }
 
 func BenchmarkIndexNothing(b *testing.B) {
-	m := Max{10}
+	m := Nothing{}
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexNothingParallel(b *testing.B) {
+	m := Nothing{}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/prefix.go

@@ -10,7 +10,7 @@ type Prefix struct {
 	Prefix string
 }
 
-func (self Prefix) Index(s string) (int, []int) {
+func (self Prefix) Index(s string, segments []int) (int, []int) {
 	idx := strings.Index(s, self.Prefix)
 	if idx == -1 {
 		return -1, nil
@@ -24,7 +24,6 @@ func (self Prefix) Index(s string) (int, []int) {
 		sub = ""
 	}
 
-	segments := make([]int, 0, utf8.RuneCountInString(sub)+1)
 	segments = append(segments, length)
 	for i, r := range sub {
 		segments = append(segments, length+i+utf8.RuneLen(r))

match/prefix_suffix.go

@@ -9,17 +9,15 @@ type PrefixSuffix struct {
 	Prefix, Suffix string
 }
 
-func (self PrefixSuffix) Index(s string) (int, []int) {
+func (self PrefixSuffix) Index(s string, segments []int) (int, []int) {
 	prefixIdx := strings.Index(s, self.Prefix)
 	if prefixIdx == -1 {
 		return -1, nil
 	}
 
-	var resp []int
 	suffixLen := len(self.Suffix)
 
 	if suffixLen > 0 {
-		var segments []int
 		for sub := s[prefixIdx:]; ; {
 			suffixIdx := strings.LastIndex(sub, self.Suffix)
 			if suffixIdx == -1 {
@@ -30,20 +28,16 @@ func (self PrefixSuffix) Index(s string) (int, []int) {
 			sub = sub[:suffixIdx]
 		}
 
-		segLen := len(segments)
+		if len(segments) == 0 {
-		if segLen == 0 {
 			return -1, nil
 		}
 
-		resp = make([]int, segLen)
+		reverseSegments(segments)
-		for i, s := range segments {
-			resp[segLen-i-1] = s
-		}
 	} else {
-		resp = append(resp, len(s)-prefixIdx)
+		segments = append(segments, len(s)-prefixIdx)
 	}
 
-	return prefixIdx, resp
+	return prefixIdx, segments
 }
 
 func (self PrefixSuffix) Len() int {

match/prefix_suffix_test.go

@@ -36,7 +36,7 @@ func TestPrefixSuffixIndex(t *testing.T) {
 		},
 	} {
 		p := PrefixSuffix{test.prefix, test.suffix}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -48,7 +48,20 @@ func TestPrefixSuffixIndex(t *testing.T) {
 
 func BenchmarkIndexPrefixSuffix(b *testing.B) {
 	m := PrefixSuffix{"qew", "sqw"}
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexPrefixSuffixParallel(b *testing.B) {
+	m := PrefixSuffix{"qew", "sqw"}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/prefix_test.go

@@ -26,7 +26,7 @@ func TestPrefixIndex(t *testing.T) {
 		},
 	} {
 		p := Prefix{test.prefix}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -38,7 +38,20 @@ func TestPrefixIndex(t *testing.T) {
 
 func BenchmarkIndexPrefix(b *testing.B) {
 	m := Prefix{"qew"}
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexPrefixParallel(b *testing.B) {
+	m := Prefix{"qew"}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/range.go

@@ -10,6 +10,9 @@ type Range struct {
 	Not    bool
 }
 
+// todo make factory
+// todo make range table inside factory
+
 func (self Range) Len() int {
 	return lenOne
 }
@@ -25,10 +28,10 @@ func (self Range) Match(s string) bool {
 	return inRange == !self.Not
 }
 
-func (self Range) Index(s string) (int, []int) {
+func (self Range) Index(s string, segments []int) (int, []int) {
 	for i, r := range s {
 		if self.Not != (r >= self.Lo && r <= self.Hi) {
-			return i, []int{utf8.RuneLen(r)}
+			return i, append(segments, utf8.RuneLen(r))
 		}
 	}
 

match/range_test.go

@@ -36,7 +36,7 @@ func TestRangeIndex(t *testing.T) {
 		},
 	} {
 		m := Range{test.lo, test.hi, test.not}
-		index, segments := m.Index(test.fixture)
+		index, segments := m.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -48,7 +48,20 @@ func TestRangeIndex(t *testing.T) {
 
 func BenchmarkIndexRange(b *testing.B) {
 	m := Range{'0', '9', false}
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexRangeParallel(b *testing.B) {
+	m := Range{'0', '9', false}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/row.go

@@ -52,7 +52,7 @@ func (self Row) Len() (l int) {
 	return self.RunesLength
 }
 
-func (self Row) Index(s string) (int, []int) {
+func (self Row) Index(s string, segments []int) (int, []int) {
 	if !self.lenOk(s) {
 		return -1, nil
 	}
@@ -66,7 +66,7 @@ func (self Row) Index(s string) (int, []int) {
 		}
 
 		if self.matchAll(s[i:]) {
-			return i, []int{self.RunesLength}
+			return i, append(segments, self.RunesLength)
 		}
 	}
 

match/row_test.go

@@ -5,20 +5,6 @@ import (
 	"testing"
 )
 
-func BenchmarkRowIndex(b *testing.B) {
-	m := Row{
-		Matchers: Matchers{
-			NewText("abc"),
-			NewText("def"),
-			Single{},
-		},
-		RunesLength: 7,
-	}
-	for i := 0; i < b.N; i++ {
-		m.Index("abcdefghijk")
-	}
-}
-
 func TestRowIndex(t *testing.T) {
 	for id, test := range []struct {
 		matchers Matchers
@@ -54,7 +40,7 @@ func TestRowIndex(t *testing.T) {
 			Matchers:    test.matchers,
 			RunesLength: test.length,
 		}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -63,3 +49,37 @@ func TestRowIndex(t *testing.T) {
 		}
 	}
 }
+
+func BenchmarkRowIndex(b *testing.B) {
+	m := Row{
+		Matchers: Matchers{
+			NewText("abc"),
+			NewText("def"),
+			Single{},
+		},
+		RunesLength: 7,
+	}
+	in := acquireSegments(len(bench_pattern))
+
+	for i := 0; i < b.N; i++ {
+		m.Index(bench_pattern, in[:0])
+	}
+}
+
+func BenchmarkIndexRowParallel(b *testing.B) {
+	m := Row{
+		Matchers: Matchers{
+			NewText("abc"),
+			NewText("def"),
+			Single{},
+		},
+		RunesLength: 7,
+	}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/single.go

@@ -2,7 +2,7 @@ package match
 
 import (
 	"fmt"
-	"strings"
+	"github.com/gobwas/glob/runes"
 	"unicode/utf8"
 )
 
@@ -17,17 +17,17 @@ func (self Single) Match(s string) bool {
 		return false
 	}
 
-	return strings.IndexRune(self.Separators, r) == -1
+	return runes.IndexRune(self.Separators, r) == -1
 }
 
 func (self Single) Len() int {
 	return lenOne
 }
 
-func (self Single) Index(s string) (int, []int) {
+func (self Single) Index(s string, segments []int) (int, []int) {
 	for i, r := range s {
-		if strings.IndexRune(self.Separators, r) == -1 {
+		if runes.IndexRune(self.Separators, r) == -1 {
-			return i, []int{utf8.RuneLen(r)}
+			return i, append(segments, utf8.RuneLen(r))
 		}
 	}
 

match/single_test.go

@@ -7,26 +7,26 @@ import (
 
 func TestSingleIndex(t *testing.T) {
 	for id, test := range []struct {
-		separators string
+		separators []rune
 		fixture    string
 		index      int
 		segments   []int
 	}{
 		{
-			".",
+			[]rune{'.'},
 			".abc",
 			1,
 			[]int{1},
 		},
 		{
-			".",
+			[]rune{'.'},
 			".",
 			-1,
 			nil,
 		},
 	} {
 		p := Single{test.separators}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -38,7 +38,20 @@ func TestSingleIndex(t *testing.T) {
 
 func BenchmarkIndexSingle(b *testing.B) {
 	m := Single{bench_separators}
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexSingleParallel(b *testing.B) {
+	m := Single{bench_separators}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/suffix.go

@@ -9,13 +9,13 @@ type Suffix struct {
 	Suffix string
 }
 
-func (self Suffix) Index(s string) (int, []int) {
+func (self Suffix) Index(s string, segments []int) (int, []int) {
 	idx := strings.Index(s, self.Suffix)
 	if idx == -1 {
 		return -1, nil
 	}
 
-	return 0, []int{idx + len(self.Suffix)}
+	return 0, append(segments, idx+len(self.Suffix))
 }
 
 func (self Suffix) Len() int {

match/suffix_test.go

@@ -26,7 +26,7 @@ func TestSuffixIndex(t *testing.T) {
 		},
 	} {
 		p := Suffix{test.prefix}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -38,7 +38,20 @@ func TestSuffixIndex(t *testing.T) {
 
 func BenchmarkIndexSuffix(b *testing.B) {
 	m := Suffix{"qwe"}
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexSuffixParallel(b *testing.B) {
+	m := Suffix{"qwe"}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/super.go

@@ -2,7 +2,6 @@ package match
 
 import (
 	"fmt"
-	"unicode/utf8"
 )
 
 type Super struct{}
@@ -15,12 +14,10 @@ func (self Super) Len() int {
 	return lenNo
 }
 
-func (self Super) Index(s string) (int, []int) {
+func (self Super) Index(s string, segments []int) (int, []int) {
-	segments := make([]int, 0, utf8.RuneCountInString(s)+1)
 	for i := range s {
 		segments = append(segments, i)
 	}
-
 	segments = append(segments, len(s))
 
 	return 0, segments

match/super_test.go

@@ -23,7 +23,7 @@ func TestSuperIndex(t *testing.T) {
 		},
 	} {
 		p := Super{}
-		index, segments := p.Index(test.fixture)
+		index, segments := p.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -35,7 +35,20 @@ func TestSuperIndex(t *testing.T) {
 
 func BenchmarkIndexSuper(b *testing.B) {
 	m := Super{}
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexSuperParallel(b *testing.B) {
+	m := Super{}
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

match/text.go

@@ -29,15 +29,13 @@ func (self Text) Len() int {
 	return self.RunesLength
 }
 
-func (self Text) Index(s string) (index int, segments []int) {
+func (self Text) Index(s string, segments []int) (int, []int) {
-	index = strings.Index(s, self.Str)
+	index := strings.Index(s, self.Str)
 	if index == -1 {
-		return
+		return -1, nil
 	}
 
-	segments = []int{self.BytesLength}
+	return index, append(segments, self.BytesLength)
-
-	return
 }
 
 func (self Text) String() string {

match/text_test.go

@@ -26,7 +26,7 @@ func TestTextIndex(t *testing.T) {
 		},
 	} {
 		m := NewText(test.text)
-		index, segments := m.Index(test.fixture)
+		index, segments := m.Index(test.fixture, []int{})
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
 		}
@@ -38,7 +38,20 @@ func TestTextIndex(t *testing.T) {
 
 func BenchmarkIndexText(b *testing.B) {
 	m := NewText("foo")
+	in := acquireSegments(len(bench_pattern))
+
 	for i := 0; i < b.N; i++ {
-		m.Index(bench_pattern)
+		m.Index(bench_pattern, in[:0])
 	}
 }
+
+func BenchmarkIndexTextParallel(b *testing.B) {
+	m := NewText("foo")
+	in := acquireSegments(len(bench_pattern))
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			m.Index(bench_pattern, in[:0])
+		}
+	})
+}

runes/runes.go

@@ -0,0 +1,128 @@
+package runes
+
+func Index(s, needle []rune) int {
+	ls, ln := len(s), len(needle)
+
+	switch {
+	case ln == 0:
+		return 0
+	case ln == 1:
+		return IndexRune(s, needle[0])
+	case ln == ls:
+		if Equal(s, needle) {
+			return 0
+		}
+		return -1
+	case ln > ls:
+		return -1
+	}
+
+head:
+	for i := 0; i < ls && ls-i >= ln; i++ {
+		for y := 0; y < ln; y++ {
+			if s[i+y] != needle[y] {
+				continue head
+			}
+		}
+
+		return i
+	}
+
+	return -1
+}
+
+func LastIndex(s, needle []rune) int {
+	ls, ln := len(s), len(needle)
+
+	switch {
+	case ln == 0:
+		if ls == 0 {
+			return 0
+		}
+		return ls
+	case ln == 1:
+		return IndexLastRune(s, needle[0])
+	case ln == ls:
+		if Equal(s, needle) {
+			return 0
+		}
+		return -1
+	case ln > ls:
+		return -1
+	}
+
+head:
+	for i := ls - 1; i >= 0 && i >= ln; i-- {
+		for y := ln - 1; y >= 0; y-- {
+			if s[i-(ln-y-1)] != needle[y] {
+				continue head
+			}
+		}
+
+		return i - ln + 1
+	}
+
+	return -1
+}
+
+// IndexAny returns the index of the first instance of any Unicode code point
+// from chars in s, or -1 if no Unicode code point from chars is present in s.
+func IndexAny(s, chars []rune) int {
+	if len(chars) > 0 {
+		for i, c := range s {
+			for _, m := range chars {
+				if c == m {
+					return i
+				}
+			}
+		}
+	}
+	return -1
+}
+
+func Contains(s, needle []rune) bool {
+	return Index(s, needle) >= 0
+}
+
+func IndexRune(s []rune, r rune) int {
+	for i, c := range s {
+		if c == r {
+			return i
+		}
+	}
+	return -1
+}
+
+func IndexLastRune(s []rune, r rune) int {
+	for i := len(s) - 1; i >= 0; i-- {
+		if s[i] == r {
+			return i
+		}
+	}
+
+	return -1
+}
+
+func Equal(a, b []rune) bool {
+	if len(a) == len(b) {
+		for i := 0; i < len(a); i++ {
+			if a[i] != b[i] {
+				return false
+			}
+		}
+
+		return true
+	}
+
+	return false
+}
+
+// HasPrefix tests whether the string s begins with prefix.
+func HasPrefix(s, prefix []rune) bool {
+	return len(s) >= len(prefix) && Equal(s[0:len(prefix)], prefix)
+}
+
+// HasSuffix tests whether the string s ends with suffix.
+func HasSuffix(s, suffix []rune) bool {
+	return len(s) >= len(suffix) && Equal(s[len(s)-len(suffix):], suffix)
+}

runes/runes_test.go

@@ -0,0 +1,222 @@
+package runes
+
+import (
+	"strings"
+	"testing"
+)
+
+type indexTest struct {
+	s   []rune
+	sep []rune
+	out int
+}
+
+type equalTest struct {
+	a   []rune
+	b   []rune
+	out bool
+}
+
+func newIndexTest(s, sep string, out int) indexTest {
+	return indexTest{[]rune(s), []rune(sep), out}
+}
+func newEqualTest(s, sep string, out bool) equalTest {
+	return equalTest{[]rune(s), []rune(sep), out}
+}
+
+var dots = "1....2....3....4"
+
+var indexTests = []indexTest{
+	newIndexTest("", "", 0),
+	newIndexTest("", "a", -1),
+	newIndexTest("", "foo", -1),
+	newIndexTest("fo", "foo", -1),
+	newIndexTest("foo", "foo", 0),
+	newIndexTest("oofofoofooo", "f", 2),
+	newIndexTest("oofofoofooo", "foo", 4),
+	newIndexTest("barfoobarfoo", "foo", 3),
+	newIndexTest("foo", "", 0),
+	newIndexTest("foo", "o", 1),
+	newIndexTest("abcABCabc", "A", 3),
+	// cases with one byte strings - test special case in Index()
+	newIndexTest("", "a", -1),
+	newIndexTest("x", "a", -1),
+	newIndexTest("x", "x", 0),
+	newIndexTest("abc", "a", 0),
+	newIndexTest("abc", "b", 1),
+	newIndexTest("abc", "c", 2),
+	newIndexTest("abc", "x", -1),
+}
+
+var lastIndexTests = []indexTest{
+	newIndexTest("", "", 0),
+	newIndexTest("", "a", -1),
+	newIndexTest("", "foo", -1),
+	newIndexTest("fo", "foo", -1),
+	newIndexTest("foo", "foo", 0),
+	newIndexTest("foo", "f", 0),
+	newIndexTest("oofofoofooo", "f", 7),
+	newIndexTest("oofofoofooo", "foo", 7),
+	newIndexTest("barfoobarfoo", "foo", 9),
+	newIndexTest("foo", "", 3),
+	newIndexTest("foo", "o", 2),
+	newIndexTest("abcABCabc", "A", 3),
+	newIndexTest("abcABCabc", "a", 6),
+}
+
+var indexAnyTests = []indexTest{
+	newIndexTest("", "", -1),
+	newIndexTest("", "a", -1),
+	newIndexTest("", "abc", -1),
+	newIndexTest("a", "", -1),
+	newIndexTest("a", "a", 0),
+	newIndexTest("aaa", "a", 0),
+	newIndexTest("abc", "xyz", -1),
+	newIndexTest("abc", "xcz", 2),
+	newIndexTest("a☺b☻c☹d", "uvw☻xyz", 3),
+	newIndexTest("aRegExp*", ".(|)*+?^$[]", 7),
+	newIndexTest(dots+dots+dots, " ", -1),
+}
+
+// Execute f on each test case.  funcName should be the name of f; it's used
+// in failure reports.
+func runIndexTests(t *testing.T, f func(s, sep []rune) int, funcName string, testCases []indexTest) {
+	for _, test := range testCases {
+		actual := f(test.s, test.sep)
+		if actual != test.out {
+			t.Errorf("%s(%q,%q) = %v; want %v", funcName, test.s, test.sep, actual, test.out)
+		}
+	}
+}
+
+func TestIndex(t *testing.T)     { runIndexTests(t, Index, "Index", indexTests) }
+func TestLastIndex(t *testing.T) { runIndexTests(t, LastIndex, "LastIndex", lastIndexTests) }
+func TestIndexAny(t *testing.T)  { runIndexTests(t, IndexAny, "IndexAny", indexAnyTests) }
+
+var equalTests = []equalTest{
+	newEqualTest("a", "a", true),
+	newEqualTest("a", "b", false),
+	newEqualTest("a☺b☻c☹d", "uvw☻xyz", false),
+	newEqualTest("a☺b☻c☹d", "a☺b☻c☹d", true),
+}
+
+func TestEqual(t *testing.T) {
+	for _, test := range equalTests {
+		actual := Equal(test.a, test.b)
+		if actual != test.out {
+			t.Errorf("Equal(%q,%q) = %v; want %v", test.a, test.b, actual, test.out)
+		}
+	}
+}
+
+func BenchmarkLastIndexRunes(b *testing.B) {
+	r := []rune("abcdef")
+	n := []rune("cd")
+
+	for i := 0; i < b.N; i++ {
+		LastIndex(r, n)
+	}
+}
+func BenchmarkLastIndexStrings(b *testing.B) {
+	r := "abcdef"
+	n := "cd"
+
+	for i := 0; i < b.N; i++ {
+		strings.LastIndex(r, n)
+	}
+}
+
+func BenchmarkIndexAnyRunes(b *testing.B) {
+	s := []rune("...b...")
+	c := []rune("abc")
+
+	for i := 0; i < b.N; i++ {
+		IndexAny(s, c)
+	}
+}
+func BenchmarkIndexAnyStrings(b *testing.B) {
+	s := "...b..."
+	c := "abc"
+
+	for i := 0; i < b.N; i++ {
+		strings.IndexAny(s, c)
+	}
+}
+
+func BenchmarkIndexRuneRunes(b *testing.B) {
+	s := []rune("...b...")
+	r := 'b'
+
+	for i := 0; i < b.N; i++ {
+		IndexRune(s, r)
+	}
+}
+func BenchmarkIndexRuneStrings(b *testing.B) {
+	s := "...b..."
+	r := 'b'
+
+	for i := 0; i < b.N; i++ {
+		strings.IndexRune(s, r)
+	}
+}
+
+func BenchmarkIndexRunes(b *testing.B) {
+	r := []rune("abcdef")
+	n := []rune("cd")
+
+	for i := 0; i < b.N; i++ {
+		Index(r, n)
+	}
+}
+func BenchmarkIndexStrings(b *testing.B) {
+	r := "abcdef"
+	n := "cd"
+
+	for i := 0; i < b.N; i++ {
+		strings.Index(r, n)
+	}
+}
+
+func BenchmarkEqualRunes(b *testing.B) {
+	x := []rune("abc")
+	y := []rune("abc")
+
+	for i := 0; i < b.N; i++ {
+		if Equal(x, y) {
+			continue
+		}
+	}
+}
+
+func BenchmarkEqualStrings(b *testing.B) {
+	x := "abc"
+	y := "abc"
+
+	for i := 0; i < b.N; i++ {
+		if x == y {
+			continue
+		}
+	}
+}
+
+func BenchmarkNotEqualRunes(b *testing.B) {
+	x := []rune("abc")
+	y := []rune("abcd")
+
+	for i := 0; i < b.N; i++ {
+		if Equal(x, y) {
+			continue
+		}
+	}
+}
+
+func BenchmarkNotEqualStrings(b *testing.B) {
+	x := "abc"
+	y := "abcd"
+
+	for i := 0; i < b.N; i++ {
+		if x == y {
+			continue
+		}
+	}
+}

strings/strings.go

@@ -0,0 +1,13 @@
+package strings
+
+import "strings"
+
+func IndexAnyRunes(s string, rs []rune) int {
+	for _, r := range rs {
+		if i := strings.IndexRune(s, r); i != -1 {
+			return i
+		}
+	}
+
+	return -1
+}

todo.txt

@@ -11,17 +11,22 @@ BenchmarkPlainGlobMatch-4                        7.20          154           +20
 BenchmarkPrefixGlobMatch-4                       8.75          113           +1191.43%
 BenchmarkSuffixGlobMatch-4                       9.07          115           +1167.92%
 BenchmarkPrefixSuffixGlobMatch-4                 15.1          125           +727.81%
-BenchmarkIndexAny-4                              887           255           -71.25%
+
-BenchmarkIndexContains-4                         492           247           -49.80%
+
-BenchmarkIndexList-4                             151           51.1          -66.16%
+
-BenchmarkIndexMax-4                              442           92.4          -79.10%
+
-BenchmarkIndexMin-4                              516           161           -68.80%
+
-BenchmarkIndexNothing-4                          452           92.8          -79.47%
-BenchmarkIndexPrefixSuffix-4                     84.3          57.2          -32.15%
 BenchmarkIndexPrefix-4                           85.1          55.9          -34.31%
-BenchmarkIndexRange-4                            170           60.6          -64.35%
+BenchmarkIndexRange-4                            170(143)      60.6          -64.35%
-BenchmarkRowIndex-4                              172           94.0          -45.35%
+BenchmarkRowIndex-4                              172(128)      94.0          -45.35%
-BenchmarkIndexSingle-4                           61.0          35.8          -41.31%
+BenchmarkIndexSingle-4                           61.0(16)      35.8          -41.31%
 BenchmarkIndexSuffix-4                           84.8          55.7          -34.32%
-BenchmarkIndexSuper-4                            461           192           -58.35%
+BenchmarkIndexSuper-4                            461(180)      192           -58.35%
 BenchmarkIndexText-4                             84.6          54.4          -35.70%
+BenchmarkIndexPrefixSuffix-4                     84.3          57.2          -32.15%
+BenchmarkIndexNothing-4                          452(3.31)     92.8          -79.47% XXX
+BenchmarkIndexMin-4                              516(274)      161           -68.80%
+BenchmarkIndexMax-4                              442(88)       92.4          -79.10%
+BenchmarkIndexList-4                             151(41)       51.1          -66.16%
+BenchmarkIndexContains-4                         492(220)      247           -49.80%
+BenchmarkIndexAny-4                              887(222)      255           -71.25%