fix tests

.gitignore

@@ -6,3 +6,4 @@ glob.iml
 *.dot
 *.png
 *.svg
+patterns.txt

.travis.yml

@@ -1,10 +1,9 @@
 language: go
 go:
-  - "1.7.X"
-  - "1.8.X"
-  - "1.9.X"
-  - "1.10.X"
-  - master
+  - 1.7.x
+  - 1.8.x
+  - 1.9.x
+  - 1.x
 
 matrix:
   allow_failures:

bench.sh

@@ -1,15 +1,21 @@
 #! /bin/bash
 
+rnd=$(head -c4 </dev/urandom|xxd -p)
+
 bench() {
-    filename="/tmp/$1-$2.bench"
+	local exp=".*"
+    if [[ ! -z $2 ]]; then
+    	$exp = $2
+    fi
+    filename=$(echo "$rnd-$1.bench" | tr "/" "_")
     if test -e "${filename}";
     then
         echo "Already exists ${filename}"
     else
         backup=`git rev-parse --abbrev-ref HEAD`
-        git checkout $1
+        git checkout "$1"
         echo -n "Creating ${filename}... "
-        go test ./... -run=NONE -bench=$2 > "${filename}" -benchmem
+        go test ./... -run=NONE -bench="$exp" > "${filename}" -benchmem
         echo "OK"
         git checkout ${backup}
         sleep 5
@@ -23,4 +29,4 @@ current=`git rev-parse --abbrev-ref HEAD`
 bench ${to} $2
 bench ${current} $2
 
-benchcmp $3 "/tmp/${to}-$2.bench" "/tmp/${current}-$2.bench"
+benchcmp $3 "$rnd-${to}.bench" "$rnd-${current}.bench"

cmd/globdraw/main.go

@@ -1,44 +1,116 @@
 package main
 
 import (
+	"bufio"
 	"flag"
 	"fmt"
-	"github.com/gobwas/glob"
-	"github.com/gobwas/glob/match"
-	"github.com/gobwas/glob/match/debug"
 	"os"
+	"os/exec"
 	"strings"
 	"unicode/utf8"
+
+	"github.com/gobwas/glob"
+	"github.com/gobwas/glob/match"
 )
 
 func main() {
-	pattern := flag.String("p", "", "pattern to draw")
-	sep := flag.String("s", "", "comma separated list of separators characters")
+	var (
+		pattern  = flag.String("p", "", "pattern to draw")
+		sep      = flag.String("s", "", "comma separated list of separators characters")
+		filepath = flag.String("file", "", "path for patterns file")
+		auto     = flag.Bool("auto", false, "autoopen result")
+		offset   = flag.Int("offset", 0, "patterns to skip")
+	)
 	flag.Parse()
 
-	if *pattern == "" {
-		flag.Usage()
+	var patterns []string
+	if *pattern != "" {
+		patterns = append(patterns, *pattern)
+	}
+	if *filepath != "" {
+		file, err := os.Open(*filepath)
+		if err != nil {
+			fmt.Printf("could not open file: %v\n", err)
 			os.Exit(1)
 		}
+		s := bufio.NewScanner(file)
+		for s.Scan() {
+			fmt.Println(*offset)
+			if *offset > 0 {
+				*offset--
+				fmt.Println("skipped")
+				continue
+			}
+			patterns = append(patterns, s.Text())
+		}
+		file.Close()
+	}
+	if len(patterns) == 0 {
+		return
+	}
 
 	var separators []rune
 	if len(*sep) > 0 {
 		for _, c := range strings.Split(*sep, ",") {
-			if r, w := utf8.DecodeRuneInString(c); len(c) > w {
-				fmt.Println("only single charactered separators are allowed")
+			r, w := utf8.DecodeRuneInString(c)
+			if len(c) > w {
+				fmt.Printf("only single charactered separators are allowed: %+q\n", c)
 				os.Exit(1)
-			} else {
+			}
 			separators = append(separators, r)
 		}
 	}
-	}
 
-	glob, err := glob.Compile(*pattern, separators...)
+	br := bufio.NewReader(os.Stdin)
+	for _, p := range patterns {
+		g, err := glob.Compile(p, separators...)
 		if err != nil {
-		fmt.Println("could not compile pattern:", err)
+			fmt.Printf("could not compile pattern %+q: %v\n", p, err)
 			os.Exit(1)
 		}
-
-	matcher := glob.(match.Matcher)
-	fmt.Fprint(os.Stdout, debug.Graphviz(*pattern, matcher))
+		s := match.Graphviz(p, g.(match.Matcher))
+		if *auto {
+			fmt.Fprintf(os.Stdout, "pattern: %+q: ", p)
+			if err := open(s); err != nil {
+				fmt.Printf("could not open graphviz: %v", err)
+				os.Exit(1)
+			}
+			if !next(br) {
+				return
+			}
+		} else {
+			fmt.Fprintln(os.Stdout, s)
+		}
+	}
+}
+
+func open(s string) error {
+	file, err := os.Create("glob.graphviz.png")
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	cmd := exec.Command("dot", "-Tpng")
+	cmd.Stdin = strings.NewReader(s)
+	cmd.Stdout = file
+	if err := cmd.Run(); err != nil {
+		return err
+	}
+	if err := file.Sync(); err != nil {
+		return err
+	}
+	cmd = exec.Command("open", file.Name())
+	return cmd.Run()
+}
+
+func next(in *bufio.Reader) bool {
+	fmt.Fprint(os.Stdout, "cancel? [Y/n]: ")
+	p, err := in.ReadBytes('\n')
+	if err != nil {
+		return false
+	}
+	if p[0] == 'Y' {
+		return false
+	}
+	return true
 }

cmd/globtest/main.go

@@ -3,11 +3,12 @@ package main
 import (
 	"flag"
 	"fmt"
-	"github.com/gobwas/glob"
 	"os"
 	"strings"
 	"testing"
 	"unicode/utf8"
+
+	"github.com/gobwas/glob"
 )
 
 func benchString(r testing.BenchmarkResult) string {

compiler/compiler.go

@@ -5,481 +5,80 @@ package compiler
 
 import (
 	"fmt"
-	"reflect"
 
+	"github.com/gobwas/glob/internal/debug"
 	"github.com/gobwas/glob/match"
 	"github.com/gobwas/glob/syntax/ast"
-	"github.com/gobwas/glob/util/runes"
 )
 
-func optimizeMatcher(matcher match.Matcher) match.Matcher {
-	switch m := matcher.(type) {
-
-	case match.Any:
-		if len(m.Separators) == 0 {
-			return match.NewSuper()
+func Compile(tree *ast.Node, sep []rune) (match.Matcher, error) {
+	m, err := compile(tree, sep)
+	if err != nil {
+		return nil, err
 	}
-
-	case match.AnyOf:
-		if len(m.Matchers) == 1 {
-			return m.Matchers[0]
-		}
-
-		return m
-
-	case match.List:
-		if m.Not == false && len(m.List) == 1 {
-			return match.NewText(string(m.List))
-		}
-
-		return m
-
-	case match.BTree:
-		m.Left = optimizeMatcher(m.Left)
-		m.Right = optimizeMatcher(m.Right)
-
-		r, ok := m.Value.(match.Text)
-		if !ok {
-			return m
-		}
-
-		var (
-			leftNil  = m.Left == nil
-			rightNil = m.Right == nil
-		)
-		if leftNil && rightNil {
-			return match.NewText(r.Str)
-		}
-
-		_, leftSuper := m.Left.(match.Super)
-		lp, leftPrefix := m.Left.(match.Prefix)
-		la, leftAny := m.Left.(match.Any)
-
-		_, rightSuper := m.Right.(match.Super)
-		rs, rightSuffix := m.Right.(match.Suffix)
-		ra, rightAny := m.Right.(match.Any)
-
-		switch {
-		case leftSuper && rightSuper:
-			return match.NewContains(r.Str, false)
-
-		case leftSuper && rightNil:
-			return match.NewSuffix(r.Str)
-
-		case rightSuper && leftNil:
-			return match.NewPrefix(r.Str)
-
-		case leftNil && rightSuffix:
-			return match.NewPrefixSuffix(r.Str, rs.Suffix)
-
-		case rightNil && leftPrefix:
-			return match.NewPrefixSuffix(lp.Prefix, r.Str)
-
-		case rightNil && leftAny:
-			return match.NewSuffixAny(r.Str, la.Separators)
-
-		case leftNil && rightAny:
-			return match.NewPrefixAny(r.Str, ra.Separators)
-		}
-
-		return m
-	}
-
-	return matcher
-}
-
-func compileMatchers(matchers []match.Matcher) (match.Matcher, error) {
-	if len(matchers) == 0 {
-		return nil, fmt.Errorf("compile error: need at least one matcher")
-	}
-	if len(matchers) == 1 {
-		return matchers[0], nil
-	}
-	if m := glueMatchers(matchers); m != nil {
 	return m, nil
 }
 
-	idx := -1
-	maxLen := -1
-	var val match.Matcher
-	for i, matcher := range matchers {
-		if l := matcher.Len(); l != -1 && l >= maxLen {
-			maxLen = l
-			idx = i
-			val = matcher
-		}
-	}
-
-	if val == nil { // not found matcher with static length
-		r, err := compileMatchers(matchers[1:])
-		if err != nil {
-			return nil, err
-		}
-		return match.NewBTree(matchers[0], nil, r), nil
-	}
-
-	left := matchers[:idx]
-	var right []match.Matcher
-	if len(matchers) > idx+1 {
-		right = matchers[idx+1:]
-	}
-
-	var l, r match.Matcher
-	var err error
-	if len(left) > 0 {
-		l, err = compileMatchers(left)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	if len(right) > 0 {
-		r, err = compileMatchers(right)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	return match.NewBTree(val, l, r), nil
-}
-
-func glueMatchers(matchers []match.Matcher) match.Matcher {
-	if m := glueMatchersAsEvery(matchers); m != nil {
-		return m
-	}
-	if m := glueMatchersAsRow(matchers); m != nil {
-		return m
-	}
-	return nil
-}
-
-func glueMatchersAsRow(matchers []match.Matcher) match.Matcher {
-	if len(matchers) <= 1 {
-		return nil
-	}
-
-	var (
-		c []match.Matcher
-		l int
-	)
-	for _, matcher := range matchers {
-		if ml := matcher.Len(); ml == -1 {
-			return nil
-		} else {
-			c = append(c, matcher)
-			l += ml
-		}
-	}
-	return match.NewRow(l, c...)
-}
-
-func glueMatchersAsEvery(matchers []match.Matcher) match.Matcher {
-	if len(matchers) <= 1 {
-		return nil
-	}
-
-	var (
-		hasAny    bool
-		hasSuper  bool
-		hasSingle bool
-		min       int
-		separator []rune
-	)
-
-	for i, matcher := range matchers {
-		var sep []rune
-
-		switch m := matcher.(type) {
-		case match.Super:
-			sep = []rune{}
-			hasSuper = true
-
-		case match.Any:
-			sep = m.Separators
-			hasAny = true
-
-		case match.Single:
-			sep = m.Separators
-			hasSingle = true
-			min++
-
-		case match.List:
-			if !m.Not {
-				return nil
-			}
-			sep = m.List
-			hasSingle = true
-			min++
-
-		default:
-			return nil
-		}
-
-		// initialize
-		if i == 0 {
-			separator = sep
-		}
-
-		if runes.Equal(sep, separator) {
-			continue
-		}
-
-		return nil
-	}
-
-	if hasSuper && !hasAny && !hasSingle {
-		return match.NewSuper()
-	}
-
-	if hasAny && !hasSuper && !hasSingle {
-		return match.NewAny(separator)
-	}
-
-	if (hasAny || hasSuper) && min > 0 && len(separator) == 0 {
-		return match.NewMin(min)
-	}
-
-	every := match.NewEveryOf()
-
-	if min > 0 {
-		every.Add(match.NewMin(min))
-
-		if !hasAny && !hasSuper {
-			every.Add(match.NewMax(min))
-		}
-	}
-
-	if len(separator) > 0 {
-		every.Add(match.NewContains(string(separator), true))
-	}
-
-	return every
-}
-
-func minimizeMatchers(matchers []match.Matcher) []match.Matcher {
-	var done match.Matcher
-	var left, right, count int
-
-	for l := 0; l < len(matchers); l++ {
-		for r := len(matchers); r > l; r-- {
-			if glued := glueMatchers(matchers[l:r]); glued != nil {
-				var swap bool
-
-				if done == nil {
-					swap = true
-				} else {
-					cl, gl := done.Len(), glued.Len()
-					swap = cl > -1 && gl > -1 && gl > cl
-					swap = swap || count < r-l
-				}
-
-				if swap {
-					done = glued
-					left = l
-					right = r
-					count = r - l
-				}
-			}
-		}
-	}
-
-	if done == nil {
-		return matchers
-	}
-
-	next := append(append([]match.Matcher{}, matchers[:left]...), done)
-	if right < len(matchers) {
-		next = append(next, matchers[right:]...)
-	}
-
-	if len(next) == len(matchers) {
-		return next
-	}
-
-	return minimizeMatchers(next)
-}
-
-// minimizeAnyOf tries to apply some heuristics to minimize number of nodes in given tree
-func minimizeTree(tree *ast.Node) *ast.Node {
-	switch tree.Kind {
-	case ast.KindAnyOf:
-		return minimizeTreeAnyOf(tree)
-	default:
-		return nil
-	}
-}
-
-// minimizeAnyOf tries to find common children of given node of AnyOf pattern
-// it searches for common children from left and from right
-// if any common children are found – then it returns new optimized ast tree
-// else it returns nil
-func minimizeTreeAnyOf(tree *ast.Node) *ast.Node {
-	if !areOfSameKind(tree.Children, ast.KindPattern) {
-		return nil
-	}
-
-	commonLeft, commonRight := commonChildren(tree.Children)
-	commonLeftCount, commonRightCount := len(commonLeft), len(commonRight)
-	if commonLeftCount == 0 && commonRightCount == 0 { // there are no common parts
-		return nil
-	}
-
-	var result []*ast.Node
-	if commonLeftCount > 0 {
-		result = append(result, ast.NewNode(ast.KindPattern, nil, commonLeft...))
-	}
-
-	var anyOf []*ast.Node
-	for _, child := range tree.Children {
-		reuse := child.Children[commonLeftCount : len(child.Children)-commonRightCount]
-		var node *ast.Node
-		if len(reuse) == 0 {
-			// this pattern is completely reduced by commonLeft and commonRight patterns
-			// so it become nothing
-			node = ast.NewNode(ast.KindNothing, nil)
-		} else {
-			node = ast.NewNode(ast.KindPattern, nil, reuse...)
-		}
-		anyOf = appendIfUnique(anyOf, node)
-	}
-	switch {
-	case len(anyOf) == 1 && anyOf[0].Kind != ast.KindNothing:
-		result = append(result, anyOf[0])
-	case len(anyOf) > 1:
-		result = append(result, ast.NewNode(ast.KindAnyOf, nil, anyOf...))
-	}
-
-	if commonRightCount > 0 {
-		result = append(result, ast.NewNode(ast.KindPattern, nil, commonRight...))
-	}
-
-	return ast.NewNode(ast.KindPattern, nil, result...)
-}
-
-func commonChildren(nodes []*ast.Node) (commonLeft, commonRight []*ast.Node) {
-	if len(nodes) <= 1 {
-		return
-	}
-
-	// find node that has least number of children
-	idx := leastChildren(nodes)
-	if idx == -1 {
-		return
-	}
-	tree := nodes[idx]
-	treeLength := len(tree.Children)
-
-	// allocate max able size for rightCommon slice
-	// to get ability insert elements in reverse order (from end to start)
-	// without sorting
-	commonRight = make([]*ast.Node, treeLength)
-	lastRight := treeLength // will use this to get results as commonRight[lastRight:]
-
-	var (
-		breakLeft   bool
-		breakRight  bool
-		commonTotal int
-	)
-	for i, j := 0, treeLength-1; commonTotal < treeLength && j >= 0 && !(breakLeft && breakRight); i, j = i+1, j-1 {
-		treeLeft := tree.Children[i]
-		treeRight := tree.Children[j]
-
-		for k := 0; k < len(nodes) && !(breakLeft && breakRight); k++ {
-			// skip least children node
-			if k == idx {
-				continue
-			}
-
-			restLeft := nodes[k].Children[i]
-			restRight := nodes[k].Children[j+len(nodes[k].Children)-treeLength]
-
-			breakLeft = breakLeft || !treeLeft.Equal(restLeft)
-
-			// disable searching for right common parts, if left part is already overlapping
-			breakRight = breakRight || (!breakLeft && j <= i)
-			breakRight = breakRight || !treeRight.Equal(restRight)
-		}
-
-		if !breakLeft {
-			commonTotal++
-			commonLeft = append(commonLeft, treeLeft)
-		}
-		if !breakRight {
-			commonTotal++
-			lastRight = j
-			commonRight[j] = treeRight
-		}
-	}
-
-	commonRight = commonRight[lastRight:]
-
-	return
-}
-
-func appendIfUnique(target []*ast.Node, val *ast.Node) []*ast.Node {
-	for _, n := range target {
-		if reflect.DeepEqual(n, val) {
-			return target
-		}
-	}
-	return append(target, val)
-}
-
-func areOfSameKind(nodes []*ast.Node, kind ast.Kind) bool {
-	for _, n := range nodes {
-		if n.Kind != kind {
-			return false
-		}
-	}
-	return true
-}
-
-func leastChildren(nodes []*ast.Node) int {
-	min := -1
-	idx := -1
-	for i, n := range nodes {
-		if idx == -1 || (len(n.Children) < min) {
-			min = len(n.Children)
-			idx = i
-		}
-	}
-	return idx
-}
-
-func compileTreeChildren(tree *ast.Node, sep []rune) ([]match.Matcher, error) {
+func compileNodes(ns []*ast.Node, sep []rune) ([]match.Matcher, error) {
 	var matchers []match.Matcher
-	for _, desc := range tree.Children {
-		m, err := compile(desc, sep)
+	for _, n := range ns {
+		m, err := compile(n, sep)
 		if err != nil {
 			return nil, err
 		}
-		matchers = append(matchers, optimizeMatcher(m))
+		matchers = append(matchers, m)
 	}
 	return matchers, nil
 }
 
-func compile(tree *ast.Node, sep []rune) (m match.Matcher, err error) {
-	switch tree.Kind {
-	case ast.KindAnyOf:
-		// todo this could be faster on pattern_alternatives_combine_lite (see glob_test.go)
-		if n := minimizeTree(tree); n != nil {
-			return compile(n, sep)
+func compile(node *ast.Node, sep []rune) (m match.Matcher, err error) {
+	if debug.Enabled {
+		debug.EnterPrefix("compiler: compiling %s", node)
+		defer func() {
+			if err != nil {
+				debug.Logf("->! %v", err)
+			} else {
+				debug.Logf("-> %s", m)
 			}
-		matchers, err := compileTreeChildren(tree, sep)
+			debug.LeavePrefix()
+		}()
+	}
+
+	// todo this could be faster on pattern_alternatives_combine_lite (see glob_test.go)
+	if n := ast.Minimize(node); n != nil {
+		debug.Logf("minimized tree -> %s", node, n)
+		r, err := compile(n, sep)
+		if debug.Enabled {
+			if err != nil {
+				debug.Logf("compiler: compile minimized tree failed: %v", err)
+			} else {
+				debug.Logf("compiler: minimized tree")
+				debug.Logf("compiler: \t%s", node)
+				debug.Logf("compiler: \t%s", n)
+			}
+		}
+		if err == nil {
+			return r, nil
+		}
+	}
+
+	switch node.Kind {
+	case ast.KindAnyOf:
+		matchers, err := compileNodes(node.Children, sep)
 		if err != nil {
 			return nil, err
 		}
 		return match.NewAnyOf(matchers...), nil
 
 	case ast.KindPattern:
-		if len(tree.Children) == 0 {
+		if len(node.Children) == 0 {
 			return match.NewNothing(), nil
 		}
-		matchers, err := compileTreeChildren(tree, sep)
+		matchers, err := compileNodes(node.Children, sep)
 		if err != nil {
 			return nil, err
 		}
-		m, err = compileMatchers(minimizeMatchers(matchers))
+		m, err = match.Compile(match.Minimize(matchers))
 		if err != nil {
 			return nil, err
 		}
@@ -497,29 +96,20 @@ func compile(tree *ast.Node, sep []rune) (m match.Matcher, err error) {
 		m = match.NewNothing()
 
 	case ast.KindList:
-		l := tree.Value.(ast.List)
+		l := node.Value.(ast.List)
 		m = match.NewList([]rune(l.Chars), l.Not)
 
 	case ast.KindRange:
-		r := tree.Value.(ast.Range)
+		r := node.Value.(ast.Range)
 		m = match.NewRange(r.Lo, r.Hi, r.Not)
 
 	case ast.KindText:
-		t := tree.Value.(ast.Text)
+		t := node.Value.(ast.Text)
 		m = match.NewText(t.Text)
 
 	default:
 		return nil, fmt.Errorf("could not compile tree: unknown node type")
 	}
 
-	return optimizeMatcher(m), nil
-}
-
-func Compile(tree *ast.Node, sep []rune) (match.Matcher, error) {
-	m, err := compile(tree, sep)
-	if err != nil {
-		return nil, err
-	}
-
-	return m, nil
+	return match.Optimize(m), nil
 }

compiler/compiler_test.go

@@ -1,357 +1,61 @@
 package compiler
 
 import (
-	"github.com/gobwas/glob/match"
-	"github.com/gobwas/glob/match/debug"
-	"github.com/gobwas/glob/syntax/ast"
 	"reflect"
 	"testing"
+
+	"github.com/gobwas/glob/match"
+	"github.com/gobwas/glob/syntax/ast"
 )
 
 var separators = []rune{'.'}
 
-func TestCommonChildren(t *testing.T) {
-	for i, test := range []struct {
-		nodes []*ast.Node
-		left  []*ast.Node
-		right []*ast.Node
-	}{
-		{
-			nodes: []*ast.Node{
-				ast.NewNode(ast.KindNothing, nil,
-					ast.NewNode(ast.KindText, ast.Text{"a"}),
-					ast.NewNode(ast.KindText, ast.Text{"z"}),
-					ast.NewNode(ast.KindText, ast.Text{"c"}),
-				),
-			},
-		},
-		{
-			nodes: []*ast.Node{
-				ast.NewNode(ast.KindNothing, nil,
-					ast.NewNode(ast.KindText, ast.Text{"a"}),
-					ast.NewNode(ast.KindText, ast.Text{"z"}),
-					ast.NewNode(ast.KindText, ast.Text{"c"}),
-				),
-				ast.NewNode(ast.KindNothing, nil,
-					ast.NewNode(ast.KindText, ast.Text{"a"}),
-					ast.NewNode(ast.KindText, ast.Text{"b"}),
-					ast.NewNode(ast.KindText, ast.Text{"c"}),
-				),
-			},
-			left: []*ast.Node{
-				ast.NewNode(ast.KindText, ast.Text{"a"}),
-			},
-			right: []*ast.Node{
-				ast.NewNode(ast.KindText, ast.Text{"c"}),
-			},
-		},
-		{
-			nodes: []*ast.Node{
-				ast.NewNode(ast.KindNothing, nil,
-					ast.NewNode(ast.KindText, ast.Text{"a"}),
-					ast.NewNode(ast.KindText, ast.Text{"b"}),
-					ast.NewNode(ast.KindText, ast.Text{"c"}),
-					ast.NewNode(ast.KindText, ast.Text{"d"}),
-				),
-				ast.NewNode(ast.KindNothing, nil,
-					ast.NewNode(ast.KindText, ast.Text{"a"}),
-					ast.NewNode(ast.KindText, ast.Text{"b"}),
-					ast.NewNode(ast.KindText, ast.Text{"c"}),
-					ast.NewNode(ast.KindText, ast.Text{"c"}),
-					ast.NewNode(ast.KindText, ast.Text{"d"}),
-				),
-			},
-			left: []*ast.Node{
-				ast.NewNode(ast.KindText, ast.Text{"a"}),
-				ast.NewNode(ast.KindText, ast.Text{"b"}),
-			},
-			right: []*ast.Node{
-				ast.NewNode(ast.KindText, ast.Text{"c"}),
-				ast.NewNode(ast.KindText, ast.Text{"d"}),
-			},
-		},
-		{
-			nodes: []*ast.Node{
-				ast.NewNode(ast.KindNothing, nil,
-					ast.NewNode(ast.KindText, ast.Text{"a"}),
-					ast.NewNode(ast.KindText, ast.Text{"b"}),
-					ast.NewNode(ast.KindText, ast.Text{"c"}),
-				),
-				ast.NewNode(ast.KindNothing, nil,
-					ast.NewNode(ast.KindText, ast.Text{"a"}),
-					ast.NewNode(ast.KindText, ast.Text{"b"}),
-					ast.NewNode(ast.KindText, ast.Text{"b"}),
-					ast.NewNode(ast.KindText, ast.Text{"c"}),
-				),
-			},
-			left: []*ast.Node{
-				ast.NewNode(ast.KindText, ast.Text{"a"}),
-				ast.NewNode(ast.KindText, ast.Text{"b"}),
-			},
-			right: []*ast.Node{
-				ast.NewNode(ast.KindText, ast.Text{"c"}),
-			},
-		},
-		{
-			nodes: []*ast.Node{
-				ast.NewNode(ast.KindNothing, nil,
-					ast.NewNode(ast.KindText, ast.Text{"a"}),
-					ast.NewNode(ast.KindText, ast.Text{"d"}),
-				),
-				ast.NewNode(ast.KindNothing, nil,
-					ast.NewNode(ast.KindText, ast.Text{"a"}),
-					ast.NewNode(ast.KindText, ast.Text{"d"}),
-				),
-				ast.NewNode(ast.KindNothing, nil,
-					ast.NewNode(ast.KindText, ast.Text{"a"}),
-					ast.NewNode(ast.KindText, ast.Text{"e"}),
-				),
-			},
-			left: []*ast.Node{
-				ast.NewNode(ast.KindText, ast.Text{"a"}),
-			},
-			right: []*ast.Node{},
-		},
-	} {
-		left, right := commonChildren(test.nodes)
-		if !nodesEqual(left, test.left) {
-			t.Errorf("[%d] left, right := commonChildren(); left = %v; want %v", i, left, test.left)
-		}
-		if !nodesEqual(right, test.right) {
-			t.Errorf("[%d] left, right := commonChildren(); right = %v; want %v", i, right, test.right)
-		}
-	}
-}
-
-func nodesEqual(a, b []*ast.Node) bool {
-	if len(a) != len(b) {
-		return false
-	}
-	for i, av := range a {
-		if !av.Equal(b[i]) {
-			return false
-		}
-	}
-	return true
-}
-
-func TestGlueMatchers(t *testing.T) {
-	for id, test := range []struct {
-		in  []match.Matcher
-		exp match.Matcher
-	}{
-		{
-			[]match.Matcher{
-				match.NewSuper(),
-				match.NewSingle(nil),
-			},
-			match.NewMin(1),
-		},
-		{
-			[]match.Matcher{
-				match.NewAny(separators),
-				match.NewSingle(separators),
-			},
-			match.EveryOf{match.Matchers{
-				match.NewMin(1),
-				match.NewContains(string(separators), true),
-			}},
-		},
-		{
-			[]match.Matcher{
-				match.NewSingle(nil),
-				match.NewSingle(nil),
-				match.NewSingle(nil),
-			},
-			match.EveryOf{match.Matchers{
-				match.NewMin(3),
-				match.NewMax(3),
-			}},
-		},
-		{
-			[]match.Matcher{
-				match.NewList([]rune{'a'}, true),
-				match.NewAny([]rune{'a'}),
-			},
-			match.EveryOf{match.Matchers{
-				match.NewMin(1),
-				match.NewContains("a", true),
-			}},
-		},
-	} {
-		act, err := compileMatchers(test.in)
-		if err != nil {
-			t.Errorf("#%d convert matchers error: %s", id, err)
-			continue
-		}
-
-		if !reflect.DeepEqual(act, test.exp) {
-			t.Errorf("#%d unexpected convert matchers result:\nact: %#v;\nexp: %#v", id, act, test.exp)
-			continue
-		}
-	}
-}
-
-func TestCompileMatchers(t *testing.T) {
-	for id, test := range []struct {
-		in  []match.Matcher
-		exp match.Matcher
-	}{
-		{
-			[]match.Matcher{
-				match.NewSuper(),
-				match.NewSingle(separators),
-				match.NewText("c"),
-			},
-			match.NewBTree(
-				match.NewText("c"),
-				match.NewBTree(
-					match.NewSingle(separators),
-					match.NewSuper(),
-					nil,
-				),
-				nil,
-			),
-		},
-		{
-			[]match.Matcher{
-				match.NewAny(nil),
-				match.NewText("c"),
-				match.NewAny(nil),
-			},
-			match.NewBTree(
-				match.NewText("c"),
-				match.NewAny(nil),
-				match.NewAny(nil),
-			),
-		},
-		{
-			[]match.Matcher{
-				match.NewRange('a', 'c', true),
-				match.NewList([]rune{'z', 't', 'e'}, false),
-				match.NewText("c"),
-				match.NewSingle(nil),
-			},
-			match.NewRow(
-				4,
-				match.Matchers{
-					match.NewRange('a', 'c', true),
-					match.NewList([]rune{'z', 't', 'e'}, false),
-					match.NewText("c"),
-					match.NewSingle(nil),
-				}...,
-			),
-		},
-	} {
-		act, err := compileMatchers(test.in)
-		if err != nil {
-			t.Errorf("#%d convert matchers error: %s", id, err)
-			continue
-		}
-
-		if !reflect.DeepEqual(act, test.exp) {
-			t.Errorf("#%d unexpected convert matchers result:\nact: %#v\nexp: %#v", id, act, test.exp)
-			continue
-		}
-	}
-}
-
-func TestConvertMatchers(t *testing.T) {
-	for id, test := range []struct {
-		in, exp []match.Matcher
-	}{
-		{
-			[]match.Matcher{
-				match.NewRange('a', 'c', true),
-				match.NewList([]rune{'z', 't', 'e'}, false),
-				match.NewText("c"),
-				match.NewSingle(nil),
-				match.NewAny(nil),
-			},
-			[]match.Matcher{
-				match.NewRow(
-					4,
-					[]match.Matcher{
-						match.NewRange('a', 'c', true),
-						match.NewList([]rune{'z', 't', 'e'}, false),
-						match.NewText("c"),
-						match.NewSingle(nil),
-					}...,
-				),
-				match.NewAny(nil),
-			},
-		},
-		{
-			[]match.Matcher{
-				match.NewRange('a', 'c', true),
-				match.NewList([]rune{'z', 't', 'e'}, false),
-				match.NewText("c"),
-				match.NewSingle(nil),
-				match.NewAny(nil),
-				match.NewSingle(nil),
-				match.NewSingle(nil),
-				match.NewAny(nil),
-			},
-			[]match.Matcher{
-				match.NewRow(
-					3,
-					match.Matchers{
-						match.NewRange('a', 'c', true),
-						match.NewList([]rune{'z', 't', 'e'}, false),
-						match.NewText("c"),
-					}...,
-				),
-				match.NewMin(3),
-			},
-		},
-	} {
-		act := minimizeMatchers(test.in)
-		if !reflect.DeepEqual(act, test.exp) {
-			t.Errorf("#%d unexpected convert matchers 2 result:\nact: %#v\nexp: %#v", id, act, test.exp)
-			continue
-		}
-	}
-}
-
 func TestCompiler(t *testing.T) {
-	for id, test := range []struct {
+	for _, test := range []struct {
+		name string
 		ast  *ast.Node
-		result match.Matcher
+		exp  match.Matcher
 		sep  []rune
 	}{
 		{
+			// #0
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindText, ast.Text{"abc"}),
 			),
-			result: match.NewText("abc"),
+			exp: match.NewText("abc"),
 		},
 		{
+			// #1
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAny, nil),
 			),
 			sep: separators,
-			result: match.NewAny(separators),
+			exp: match.NewAny(separators),
 		},
 		{
+			// #2
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAny, nil),
 			),
-			result: match.NewSuper(),
+			exp: match.NewSuper(),
 		},
 		{
+			// #3
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindSuper, nil),
 			),
-			result: match.NewSuper(),
+			exp: match.NewSuper(),
 		},
 		{
+			// #4
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindSingle, nil),
 			),
 			sep: separators,
-			result: match.NewSingle(separators),
+			exp: match.NewSingle(separators),
 		},
 		{
+			// #5
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindRange, ast.Range{
 					Lo:  'a',
@@ -359,18 +63,20 @@ func TestCompiler(t *testing.T) {
 					Not: true,
 				}),
 			),
-			result: match.NewRange('a', 'z', true),
+			exp: match.NewRange('a', 'z', true),
 		},
 		{
+			// #6
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindList, ast.List{
 					Chars: "abc",
 					Not:   true,
 				}),
 			),
-			result: match.NewList([]rune{'a', 'b', 'c'}, true),
+			exp: match.NewList([]rune{'a', 'b', 'c'}, true),
 		},
 		{
+			// #7
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAny, nil),
 				ast.NewNode(ast.KindSingle, nil),
@@ -378,40 +84,40 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindSingle, nil),
 			),
 			sep: separators,
-			result: match.EveryOf{Matchers: match.Matchers{
+			exp: match.NewEveryOf([]match.Matcher{
 				match.NewMin(3),
-				match.NewContains(string(separators), true),
-			}},
+				match.NewAny(separators),
+			}),
 		},
 		{
+			// #8
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAny, nil),
 				ast.NewNode(ast.KindSingle, nil),
 				ast.NewNode(ast.KindSingle, nil),
 				ast.NewNode(ast.KindSingle, nil),
 			),
-			result: match.NewMin(3),
+			exp: match.NewMin(3),
 		},
 		{
+			// #9
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAny, nil),
 				ast.NewNode(ast.KindText, ast.Text{"abc"}),
 				ast.NewNode(ast.KindSingle, nil),
 			),
 			sep: separators,
-			result: match.NewBTree(
-				match.NewRow(
-					4,
-					match.Matchers{
+			exp: match.NewTree(
+				match.NewRow([]match.MatchIndexSizer{
 					match.NewText("abc"),
 					match.NewSingle(separators),
-					}...,
-				),
+				}),
 				match.NewAny(separators),
-				nil,
+				match.Nothing{},
 			),
 		},
 		{
+			// #10
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindText, ast.Text{"/"}),
 				ast.NewNode(ast.KindAnyOf, nil,
@@ -421,17 +127,21 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindSuper, nil),
 			),
 			sep: separators,
-			result: match.NewBTree(
+			exp: match.NewTree(
 				match.NewText("/"),
-				nil,
-				match.NewBTree(
-					match.NewAnyOf(match.NewText("z"), match.NewText("ab")),
-					nil,
+				match.Nothing{},
+				match.NewTree(
+					match.MustIndexedAnyOf(
+						match.NewText("z"),
+						match.NewText("ab"),
+					),
+					match.Nothing{},
 					match.NewSuper(),
 				),
 			),
 		},
 		{
+			// #11
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindSuper, nil),
 				ast.NewNode(ast.KindSingle, nil),
@@ -439,42 +149,43 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindSingle, nil),
 			),
 			sep: separators,
-			result: match.NewBTree(
-				match.NewRow(
-					5,
-					match.Matchers{
+			exp: match.NewTree(
+				match.NewRow([]match.MatchIndexSizer{
 					match.NewSingle(separators),
 					match.NewText("abc"),
 					match.NewSingle(separators),
-					}...,
-				),
+				}),
 				match.NewSuper(),
-				nil,
+				match.Nothing{},
 			),
 		},
 		{
+			// #12
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAny, nil),
 				ast.NewNode(ast.KindText, ast.Text{"abc"}),
 			),
-			result: match.NewSuffix("abc"),
+			exp: match.NewSuffix("abc"),
 		},
 		{
+			// #13
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindText, ast.Text{"abc"}),
 				ast.NewNode(ast.KindAny, nil),
 			),
-			result: match.NewPrefix("abc"),
+			exp: match.NewPrefix("abc"),
 		},
 		{
+			// #14
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindText, ast.Text{"abc"}),
 				ast.NewNode(ast.KindAny, nil),
 				ast.NewNode(ast.KindText, ast.Text{"def"}),
 			),
-			result: match.NewPrefixSuffix("abc", "def"),
+			exp: match.NewPrefixSuffix("abc", "def"),
 		},
 		{
+			// #15
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAny, nil),
 				ast.NewNode(ast.KindAny, nil),
@@ -483,9 +194,10 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindAny, nil),
 				ast.NewNode(ast.KindAny, nil),
 			),
-			result: match.NewContains("abc", false),
+			exp: match.NewContains("abc"),
 		},
 		{
+			// #16
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAny, nil),
 				ast.NewNode(ast.KindAny, nil),
@@ -495,13 +207,15 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindAny, nil),
 			),
 			sep: separators,
-			result: match.NewBTree(
+			exp: match.NewTree(
 				match.NewText("abc"),
 				match.NewAny(separators),
 				match.NewAny(separators),
 			),
 		},
 		{
+			// #17
+			// pattern: "**?abc**?"
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindSuper, nil),
 				ast.NewNode(ast.KindSingle, nil),
@@ -509,19 +223,21 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindSuper, nil),
 				ast.NewNode(ast.KindSingle, nil),
 			),
-			result: match.NewBTree(
+			exp: match.NewTree(
 				match.NewText("abc"),
 				match.NewMin(1),
 				match.NewMin(1),
 			),
 		},
 		{
+			// #18
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindText, ast.Text{"abc"}),
 			),
-			result: match.NewText("abc"),
+			exp: match.NewText("abc"),
 		},
 		{
+			// #19
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAnyOf, nil,
 					ast.NewNode(ast.KindPattern, nil,
@@ -533,9 +249,10 @@ func TestCompiler(t *testing.T) {
 					),
 				),
 			),
-			result: match.NewText("abc"),
+			exp: match.NewText("abc"),
 		},
 		{
+			// #20
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAnyOf, nil,
 					ast.NewNode(ast.KindPattern, nil,
@@ -554,35 +271,34 @@ func TestCompiler(t *testing.T) {
 					),
 				),
 			),
-			result: match.NewBTree(
+			exp: match.NewTree(
 				match.NewText("abc"),
-				nil,
-				match.AnyOf{Matchers: match.Matchers{
+				match.Nothing{},
+				match.NewAnyOf(
 					match.NewSingle(nil),
 					match.NewList([]rune{'d', 'e', 'f'}, false),
 					match.NewNothing(),
-				}},
+				),
 			),
 		},
 		{
+			// #21
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindRange, ast.Range{Lo: 'a', Hi: 'z'}),
 				ast.NewNode(ast.KindRange, ast.Range{Lo: 'a', Hi: 'x', Not: true}),
 				ast.NewNode(ast.KindAny, nil),
 			),
-			result: match.NewBTree(
-				match.NewRow(
-					2,
-					match.Matchers{
+			exp: match.NewTree(
+				match.NewRow([]match.MatchIndexSizer{
 					match.NewRange('a', 'z', false),
 					match.NewRange('a', 'x', true),
-					}...,
-				),
-				nil,
+				}),
+				match.Nothing{},
 				match.NewSuper(),
 			),
 		},
 		{
+			// #22
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAnyOf, nil,
 					ast.NewNode(ast.KindPattern, nil,
@@ -597,28 +313,29 @@ func TestCompiler(t *testing.T) {
 					),
 				),
 			),
-			result: match.NewRow(
-				7,
-				match.Matchers{
+			exp: match.NewRow([]match.MatchIndexSizer{
 				match.NewText("abc"),
-					match.AnyOf{Matchers: match.Matchers{
+				match.MustIndexedSizedAnyOf(
 					match.NewList([]rune{'a', 'b', 'c'}, false),
 					match.NewList([]rune{'d', 'e', 'f'}, false),
-					}},
-					match.NewText("ghi"),
-				}...,
 				),
+				match.NewText("ghi"),
+			}),
 		},
 	} {
-		m, err := Compile(test.ast, test.sep)
+		t.Run(test.name, func(t *testing.T) {
+			act, err := Compile(test.ast, test.sep)
 			if err != nil {
-			t.Errorf("compilation error: %s", err)
-			continue
-		}
-
-		if !reflect.DeepEqual(m, test.result) {
-			t.Errorf("[%d] Compile():\nexp: %#v\nact: %#v\n\ngraphviz:\nexp:\n%s\nact:\n%s\n", id, test.result, m, debug.Graphviz("", test.result.(match.Matcher)), debug.Graphviz("", m.(match.Matcher)))
-			continue
+				t.Fatalf("compilation error: %s", err)
 			}
+			if !reflect.DeepEqual(act, test.exp) {
+				t.Errorf(
+					"Compile():\nact: %#v\nexp: %#v\n\ngraphviz:\n%s\n%s\n",
+					act, test.exp,
+					match.Graphviz("act", act.(match.Matcher)),
+					match.Graphviz("exp", test.exp.(match.Matcher)),
+				)
+			}
+		})
 	}
 }

glob_test.go

@@ -1,8 +1,11 @@
 package glob
 
 import (
+	"fmt"
 	"regexp"
 	"testing"
+
+	"github.com/gobwas/glob/match"
 )
 
 const (
@@ -57,7 +60,30 @@ type test struct {
 }
 
 func glob(s bool, p, m string, d ...rune) test {
-	return test{p, m, s, d}
+	return test{
+		should:     s,
+		pattern:    p,
+		match:      m,
+		delimiters: d,
+	}
+}
+
+func globc(p string, d ...rune) test {
+	return test{pattern: p, delimiters: d}
+}
+
+func TestCompilation(t *testing.T) {
+	for _, test := range []test{
+		globc("{*,**,?}", '.'),
+		globc("{*.google.*,yandex.*}", '.'),
+	} {
+		t.Run("", func(t *testing.T) {
+			_, err := Compile(test.pattern, test.delimiters...)
+			if err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
 }
 
 func TestGlob(t *testing.T) {
@@ -134,6 +160,8 @@ func TestGlob(t *testing.T) {
 		glob(true, "*//{,*.}example.com", "http://example.com"),
 		glob(false, "*//{,*.}example.com", "http://example.com.net"),
 
+		glob(true, "{a*,b}c", "abc", '.'),
+
 		glob(true, pattern_all, fixture_all_match),
 		glob(false, pattern_all, fixture_all_mismatch),
 
@@ -164,6 +192,11 @@ func TestGlob(t *testing.T) {
 		glob(false, pattern_prefix_suffix, fixture_prefix_suffix_mismatch),
 	} {
 		t.Run("", func(t *testing.T) {
+			defer func() {
+				if thePanic := recover(); thePanic != nil {
+					t.Fatalf("panic recovered: %v", thePanic)
+				}
+			}()
 			g := MustCompile(test.pattern, test.delimiters...)
 			result := g.Match(test.match)
 			if result != test.should {
@@ -220,20 +253,10 @@ func BenchmarkParseRegexp(b *testing.B) {
 
 func BenchmarkAllGlobMatch(b *testing.B) {
 	m, _ := Compile(pattern_all)
-
 	for i := 0; i < b.N; i++ {
 		_ = m.Match(fixture_all_match)
 	}
 }
-func BenchmarkAllGlobMatchParallel(b *testing.B) {
-	m, _ := Compile(pattern_all)
-
-	b.RunParallel(func(pb *testing.PB) {
-		for pb.Next() {
-			_ = m.Match(fixture_all_match)
-		}
-	})
-}
 
 func BenchmarkAllRegexpMatch(b *testing.B) {
 	m := regexp.MustCompile(regexp_all)
@@ -243,22 +266,16 @@ func BenchmarkAllRegexpMatch(b *testing.B) {
 		_ = m.Match(f)
 	}
 }
+
 func BenchmarkAllGlobMismatch(b *testing.B) {
-	m, _ := Compile(pattern_all)
+	m := MustCompile(pattern_all)
+	fmt.Println(match.Graphviz(pattern_all, m.(match.Matcher)))
 
 	for i := 0; i < b.N; i++ {
 		_ = m.Match(fixture_all_mismatch)
 	}
 }
-func BenchmarkAllGlobMismatchParallel(b *testing.B) {
-	m, _ := Compile(pattern_all)
 
-	b.RunParallel(func(pb *testing.PB) {
-		for pb.Next() {
-			_ = m.Match(fixture_all_mismatch)
-		}
-	})
-}
 func BenchmarkAllRegexpMismatch(b *testing.B) {
 	m := regexp.MustCompile(regexp_all)
 	f := []byte(fixture_all_mismatch)

internal/debug/debug_disabled.go

@@ -0,0 +1,17 @@
+// +build !globdebug
+
+package debug
+
+const Enabled = false
+
+func Logf(string, ...interface{})        {}
+func Enter()                             {}
+func Leave()                             {}
+func EnterPrefix(string, ...interface{}) {}
+func LeavePrefix()                       {}
+func Indexing(n, s string) func(int, []int) {
+	panic("must never be called")
+}
+func Matching(n, s string) func(bool) {
+	panic("must never be called")
+}

internal/debug/debug_enabled.go

@@ -0,0 +1,64 @@
+// +build globdebug
+
+package debug
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+const Enabled = true
+
+var (
+	i      = 0
+	prefix = map[int]string{}
+)
+
+func Logf(f string, args ...interface{}) {
+	if f != "" && prefix[i] != "" {
+		f = ": " + f
+	}
+	fmt.Fprint(os.Stderr,
+		strings.Repeat("  ", i),
+		fmt.Sprintf("(%d) ", i),
+		prefix[i],
+		fmt.Sprintf(f, args...),
+		"\n",
+	)
+}
+
+func Indexing(name, s string) func(int, []int) {
+	EnterPrefix("%s: index: %q", name, s)
+	return func(index int, segments []int) {
+		Logf("-> %d, %v", index, segments)
+		LeavePrefix()
+	}
+}
+
+func Matching(name, s string) func(bool) {
+	EnterPrefix("%s: match %q", name, s)
+	return func(ok bool) {
+		Logf("-> %t", ok)
+		LeavePrefix()
+	}
+}
+
+func EnterPrefix(s string, args ...interface{}) {
+	Enter()
+	prefix[i] = fmt.Sprintf(s, args...)
+	Logf("")
+}
+
+func LeavePrefix() {
+	prefix[i] = ""
+	Leave()
+}
+
+func Enter() {
+	i++
+}
+
+func Leave() {
+	i--
+}

match/any.go

@@ -2,23 +2,24 @@ package match
 
 import (
 	"fmt"
-	"github.com/gobwas/glob/util/strings"
+
+	"github.com/gobwas/glob/util/runes"
 )
 
 type Any struct {
-	Separators []rune
+	sep []rune
 }
 
 func NewAny(s []rune) Any {
 	return Any{s}
 }
 
-func (self Any) Match(s string) bool {
-	return strings.IndexAnyRunes(s, self.Separators) == -1
+func (a Any) Match(s string) bool {
+	return runes.IndexAnyRune(s, a.sep) == -1
 }
 
-func (self Any) Index(s string) (int, []int) {
-	found := strings.IndexAnyRunes(s, self.Separators)
+func (a Any) Index(s string) (int, []int) {
+	found := runes.IndexAnyRune(s, a.sep)
 	switch found {
 	case -1:
 	case 0:
@@ -36,10 +37,10 @@ func (self Any) Index(s string) (int, []int) {
 	return 0, segments
 }
 
-func (self Any) Len() int {
-	return lenNo
+func (a Any) MinLen() int {
+	return 0
 }
 
-func (self Any) String() string {
-	return fmt.Sprintf("<any:![%s]>", string(self.Separators))
+func (a Any) String() string {
+	return fmt.Sprintf("<any:![%s]>", string(a.sep))
 }

match/any_of.go

@@ -1,82 +1,122 @@
 package match
 
-import "fmt"
+import (
+	"fmt"
+
+	"github.com/gobwas/glob/internal/debug"
+)
 
 type AnyOf struct {
-	Matchers Matchers
+	ms  []Matcher
+	min int
 }
 
-func NewAnyOf(m ...Matcher) AnyOf {
-	return AnyOf{Matchers(m)}
+func NewAnyOf(ms ...Matcher) Matcher {
+	a := AnyOf{ms, minLen(ms)}
+	if mis, ok := MatchIndexers(ms); ok {
+		x := IndexedAnyOf{a, mis}
+		if msz, ok := MatchIndexSizers(ms); ok {
+			sz := -1
+			for _, m := range msz {
+				n := m.RunesCount()
+				if sz == -1 {
+					sz = n
+				} else if sz != n {
+					sz = -1
+					break
+				}
+			}
+			if sz != -1 {
+				return IndexedSizedAnyOf{x, sz}
+			}
+		}
+		return x
+	}
+	return a
 }
 
-func (self *AnyOf) Add(m Matcher) error {
-	self.Matchers = append(self.Matchers, m)
-	return nil
+func MustIndexedAnyOf(ms ...Matcher) MatchIndexer {
+	return NewAnyOf(ms...).(MatchIndexer)
 }
 
-func (self AnyOf) Match(s string) bool {
-	for _, m := range self.Matchers {
+func MustIndexedSizedAnyOf(ms ...Matcher) MatchIndexSizer {
+	return NewAnyOf(ms...).(MatchIndexSizer)
+}
+
+func (a AnyOf) Match(s string) (ok bool) {
+	if debug.Enabled {
+		done := debug.Matching("any_of", s)
+		defer func() { done(ok) }()
+	}
+	for _, m := range a.ms {
 		if m.Match(s) {
 			return true
 		}
 	}
-
 	return false
 }
 
-func (self AnyOf) Index(s string) (int, []int) {
-	index := -1
-
-	segments := acquireSegments(len(s))
-	for _, m := range self.Matchers {
-		idx, seg := m.Index(s)
-		if idx == -1 {
-			continue
+func (a AnyOf) MinLen() (n int) {
+	return a.min
 }
 
-		if index == -1 || idx < index {
-			index = idx
+func (a AnyOf) Content(cb func(Matcher)) {
+	for _, m := range a.ms {
+		cb(m)
+	}
+}
+
+func (a AnyOf) String() string {
+	return fmt.Sprintf("<any_of:[%s]>", Matchers(a.ms))
+}
+
+type IndexedAnyOf struct {
+	AnyOf
+	ms []MatchIndexer
+}
+
+func (a IndexedAnyOf) Index(s string) (index int, segments []int) {
+	if debug.Enabled {
+		done := debug.Indexing("any_of", s)
+		defer func() { done(index, segments) }()
+	}
+	index = -1
+	segments = acquireSegments(len(s))
+	for _, m := range a.ms {
+		if debug.Enabled {
+			debug.Logf("indexing: any_of: trying %s", m)
+		}
+		i, seg := m.Index(s)
+		if i == -1 {
+			continue
+		}
+		if index == -1 || i < index {
+			index = i
 			segments = append(segments[:0], seg...)
 			continue
 		}
-
-		if idx > index {
+		if i > index {
 			continue
 		}
-
-		// here idx == index
+		// here i == index
 		segments = appendMerge(segments, seg)
 	}
-
 	if index == -1 {
 		releaseSegments(segments)
 		return -1, nil
 	}
-
 	return index, segments
 }
 
-func (self AnyOf) Len() (l int) {
-	l = -1
-	for _, m := range self.Matchers {
-		ml := m.Len()
-		switch {
-		case l == -1:
-			l = ml
-			continue
-
-		case ml == -1:
-			return -1
-
-		case l != ml:
-			return -1
-		}
+func (a IndexedAnyOf) String() string {
+	return fmt.Sprintf("<indexed_any_of:[%s]>", a.ms)
 }
 
-	return
+type IndexedSizedAnyOf struct {
+	IndexedAnyOf
+	runes int
 }
 
-func (self AnyOf) String() string {
-	return fmt.Sprintf("<any_of:[%s]>", self.Matchers)
+func (a IndexedSizedAnyOf) RunesCount() int {
+	return a.runes
 }

match/any_of_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 )
 
-func TestAnyOfIndex(t *testing.T) {
+func TestIndexedAnyOf(t *testing.T) {
 	for id, test := range []struct {
 		matchers Matchers
 		fixture  string
@@ -41,13 +41,15 @@ func TestAnyOfIndex(t *testing.T) {
 			[]int{1},
 		},
 	} {
-		everyOf := NewAnyOf(test.matchers...)
-		index, segments := everyOf.Index(test.fixture)
+		t.Run("", func(t *testing.T) {
+			a := NewAnyOf(test.matchers...).(Indexer)
+			index, segments := a.Index(test.fixture)
 			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)
 			}
+		})
 	}
 }

match/btree.go

@@ -1,185 +0,0 @@
-package match
-
-import (
-	"fmt"
-	"unicode/utf8"
-)
-
-type BTree struct {
-	Value            Matcher
-	Left             Matcher
-	Right            Matcher
-	ValueLengthRunes int
-	LeftLengthRunes  int
-	RightLengthRunes int
-	LengthRunes      int
-}
-
-func NewBTree(Value, Left, Right Matcher) (tree BTree) {
-	tree.Value = Value
-	tree.Left = Left
-	tree.Right = Right
-
-	lenOk := true
-	if tree.ValueLengthRunes = Value.Len(); tree.ValueLengthRunes == -1 {
-		lenOk = false
-	}
-
-	if Left != nil {
-		if tree.LeftLengthRunes = Left.Len(); tree.LeftLengthRunes == -1 {
-			lenOk = false
-		}
-	}
-
-	if Right != nil {
-		if tree.RightLengthRunes = Right.Len(); tree.RightLengthRunes == -1 {
-			lenOk = false
-		}
-	}
-
-	if lenOk {
-		tree.LengthRunes = tree.LeftLengthRunes + tree.ValueLengthRunes + tree.RightLengthRunes
-	} else {
-		tree.LengthRunes = -1
-	}
-
-	return tree
-}
-
-func (self BTree) Len() int {
-	return self.LengthRunes
-}
-
-// todo?
-func (self BTree) Index(s string) (index int, segments []int) {
-	//inputLen := len(s)
-	//// try to cut unnecessary parts
-	//// by knowledge of length of right and left part
-	//offset, limit := self.offsetLimit(inputLen)
-	//for offset < limit {
-	//	// search for matching part in substring
-	//	vi, segments := self.Value.Index(s[offset:limit])
-	//	if index == -1 {
-	//		return -1, nil
-	//	}
-	//	if self.Left == nil {
-	//		if index != offset {
-	//			return -1, nil
-	//		}
-	//	} else {
-	//		left := s[:offset+vi]
-	//		i := self.Left.IndexSuffix(left)
-	//		if i == -1 {
-	//			return -1, nil
-	//		}
-	//		index = i
-	//	}
-	//	if self.Right != nil {
-	//		for _, seg := range segments {
-	//			right := s[:offset+vi+seg]
-	//		}
-	//	}
-
-	//	l := s[:offset+index]
-	//	var left bool
-	//	if self.Left != nil {
-	//		left = self.Left.Index(l)
-	//	} else {
-	//		left = l == ""
-	//	}
-	//}
-
-	return -1, nil
-}
-
-func (self BTree) Match(s string) bool {
-	inputLen := len(s)
-	// try to cut unnecessary parts
-	// by knowledge of length of right and left part
-	offset, limit := self.offsetLimit(inputLen)
-
-	for offset < limit {
-		// search for matching part in substring
-		index, segments := self.Value.Index(s[offset:limit])
-		if index == -1 {
-			releaseSegments(segments)
-			return false
-		}
-
-		l := s[:offset+index]
-		var left bool
-		if self.Left != nil {
-			left = self.Left.Match(l)
-		} else {
-			left = l == ""
-		}
-
-		if left {
-			for i := len(segments) - 1; i >= 0; i-- {
-				length := segments[i]
-
-				var right bool
-				var r string
-				// if there is no string for the right branch
-				if inputLen <= offset+index+length {
-					r = ""
-				} else {
-					r = s[offset+index+length:]
-				}
-
-				if self.Right != nil {
-					right = self.Right.Match(r)
-				} else {
-					right = r == ""
-				}
-
-				if right {
-					releaseSegments(segments)
-					return true
-				}
-			}
-		}
-
-		_, step := utf8.DecodeRuneInString(s[offset+index:])
-		offset += index + step
-
-		releaseSegments(segments)
-	}
-
-	return false
-}
-
-func (self BTree) offsetLimit(inputLen int) (offset int, limit int) {
-	// self.Length, self.RLen and self.LLen are values meaning the length of runes for each part
-	// here we manipulating byte length for better optimizations
-	// but these checks still works, cause minLen of 1-rune string is 1 byte.
-	if self.LengthRunes != -1 && self.LengthRunes > inputLen {
-		return 0, 0
-	}
-	if self.LeftLengthRunes >= 0 {
-		offset = self.LeftLengthRunes
-	}
-	if self.RightLengthRunes >= 0 {
-		limit = inputLen - self.RightLengthRunes
-	} else {
-		limit = inputLen
-	}
-	return offset, limit
-}
-
-func (self BTree) String() string {
-	const n string = "<nil>"
-	var l, r string
-	if self.Left == nil {
-		l = n
-	} else {
-		l = self.Left.String()
-	}
-	if self.Right == nil {
-		r = n
-	} else {
-		r = self.Right.String()
-	}
-
-	return fmt.Sprintf("<btree:[%s<-%s->%s]>", l, self.Value, r)
-}

match/btree_test.go

@@ -1,90 +0,0 @@
-package match
-
-import (
-	"testing"
-)
-
-func TestBTree(t *testing.T) {
-	for id, test := range []struct {
-		tree BTree
-		str  string
-		exp  bool
-	}{
-		{
-			NewBTree(NewText("abc"), NewSuper(), NewSuper()),
-			"abc",
-			true,
-		},
-		{
-			NewBTree(NewText("a"), NewSingle(nil), NewSingle(nil)),
-			"aaa",
-			true,
-		},
-		{
-			NewBTree(NewText("b"), NewSingle(nil), nil),
-			"bbb",
-			false,
-		},
-		{
-			NewBTree(
-				NewText("c"),
-				NewBTree(
-					NewSingle(nil),
-					NewSuper(),
-					nil,
-				),
-				nil,
-			),
-			"abc",
-			true,
-		},
-	} {
-		act := test.tree.Match(test.str)
-		if act != test.exp {
-			t.Errorf("#%d match %q error: act: %t; exp: %t", id, test.str, act, test.exp)
-			continue
-		}
-	}
-}
-
-type fakeMatcher struct {
-	len  int
-	name string
-}
-
-func (f *fakeMatcher) Match(string) bool {
-	return true
-}
-
-var i = 3
-
-func (f *fakeMatcher) Index(s string) (int, []int) {
-	seg := make([]int, 0, i)
-	for x := 0; x < i; x++ {
-		seg = append(seg, x)
-	}
-	return 0, seg
-}
-func (f *fakeMatcher) Len() int {
-	return f.len
-}
-func (f *fakeMatcher) String() string {
-	return f.name
-}
-
-func BenchmarkMatchBTree(b *testing.B) {
-	l := &fakeMatcher{4, "left_fake"}
-	r := &fakeMatcher{4, "right_fake"}
-	v := &fakeMatcher{2, "value_fake"}
-
-	// must be <= len(l + r + v)
-	fixture := "abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghij"
-
-	bt := NewBTree(v, l, r)
-
-	b.RunParallel(func(pb *testing.PB) {
-		for pb.Next() {
-			bt.Match(fixture)
-		}
-	})
-}

match/contains.go

@@ -6,29 +6,33 @@ import (
 )
 
 type Contains struct {
-	Needle string
-	Not    bool
+	s   string
+	not bool
 }
 
-func NewContains(needle string, not bool) Contains {
-	return Contains{needle, not}
+func NewContains(needle string) Contains {
+	return Contains{needle, false}
 }
 
-func (self Contains) Match(s string) bool {
-	return strings.Contains(s, self.Needle) != self.Not
+func NewNotContains(needle string) Contains {
+	return Contains{needle, true}
 }
 
-func (self Contains) Index(s string) (int, []int) {
+func (c Contains) Match(s string) bool {
+	return strings.Contains(s, c.s) != c.not
+}
+
+func (c Contains) Index(s string) (int, []int) {
 	var offset int
 
-	idx := strings.Index(s, self.Needle)
+	idx := strings.Index(s, c.s)
 
-	if !self.Not {
+	if !c.not {
 		if idx == -1 {
 			return -1, nil
 		}
 
-		offset = idx + len(self.Needle)
+		offset = idx + len(c.s)
 		if len(s) <= offset {
 			return 0, []int{offset}
 		}
@@ -45,14 +49,14 @@ func (self Contains) Index(s string) (int, []int) {
 	return 0, append(segments, offset+len(s))
 }
 
-func (self Contains) Len() int {
-	return lenNo
+func (c Contains) MinLen() int {
+	return 0
 }
 
-func (self Contains) String() string {
+func (c Contains) String() string {
 	var not string
-	if self.Not {
+	if c.not {
 		not = "!"
 	}
-	return fmt.Sprintf("<contains:%s[%s]>", not, self.Needle)
+	return fmt.Sprintf("<contains:%s[%s]>", not, c.s)
 }

match/contains_test.go

@@ -42,7 +42,7 @@ func TestContainsIndex(t *testing.T) {
 			[]int{0, 1, 2, 3},
 		},
 	} {
-		p := NewContains(test.prefix, test.not)
+		p := Contains{test.prefix, test.not}
 		index, segments := p.Index(test.fixture)
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
@@ -54,8 +54,7 @@ func TestContainsIndex(t *testing.T) {
 }
 
 func BenchmarkIndexContains(b *testing.B) {
-	m := NewContains(string(bench_separators), true)
-
+	m := Contains{string(bench_separators), true}
 	for i := 0; i < b.N; i++ {
 		_, s := m.Index(bench_pattern)
 		releaseSegments(s)
@@ -63,8 +62,7 @@ func BenchmarkIndexContains(b *testing.B) {
 }
 
 func BenchmarkIndexContainsParallel(b *testing.B) {
-	m := NewContains(string(bench_separators), true)
-
+	m := Contains{string(bench_separators), true}
 	b.RunParallel(func(pb *testing.PB) {
 		for pb.Next() {
 			_, s := m.Index(bench_pattern)

match/debug.go

@@ -0,0 +1,69 @@
+package match
+
+import (
+	"bytes"
+	"fmt"
+	"math/rand"
+	"os"
+	"strings"
+	"sync/atomic"
+)
+
+var i = new(int32)
+
+func logf(f string, args ...interface{}) {
+	n := int(atomic.LoadInt32(i))
+	fmt.Fprint(os.Stderr,
+		strings.Repeat("  ", n),
+		fmt.Sprintf("(%d) ", n),
+		fmt.Sprintf(f, args...),
+		"\n",
+	)
+}
+
+func enter() {
+	atomic.AddInt32(i, 1)
+}
+
+func leave() {
+	atomic.AddInt32(i, -1)
+}
+
+func Graphviz(pattern string, m Matcher) string {
+	return fmt.Sprintf(`digraph G {graph[label="%s"];%s}`, pattern, graphviz(m, fmt.Sprintf("%x", rand.Int63())))
+}
+
+func graphviz(m Matcher, id string) string {
+	buf := &bytes.Buffer{}
+
+	switch v := m.(type) {
+	case Tree:
+		fmt.Fprintf(buf, `"%s"[label="%s"];`, id, v.value)
+		for _, m := range []Matcher{v.left, v.right} {
+			switch n := m.(type) {
+			case nil:
+				rnd := rand.Int63()
+				fmt.Fprintf(buf, `"%x"[label="<nil>"];`, rnd)
+				fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
+
+			default:
+				sub := fmt.Sprintf("%x", rand.Int63())
+				fmt.Fprintf(buf, `"%s"->"%s";`, id, sub)
+				fmt.Fprintf(buf, graphviz(n, sub))
+			}
+		}
+
+	case Container:
+		fmt.Fprintf(buf, `"%s"[label="Container(%T)"];`, id, m)
+		v.Content(func(m Matcher) {
+			rnd := rand.Int63()
+			fmt.Fprintf(buf, graphviz(m, fmt.Sprintf("%x", rnd)))
+			fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
+		})
+
+	default:
+		fmt.Fprintf(buf, `"%s"[label="%s"];`, id, m)
+	}
+
+	return buf.String()
+}

match/debug/debug.go

@@ -1,55 +0,0 @@
-package debug
-
-import (
-	"bytes"
-	"fmt"
-	"github.com/gobwas/glob/match"
-	"math/rand"
-)
-
-func Graphviz(pattern string, m match.Matcher) string {
-	return fmt.Sprintf(`digraph G {graph[label="%s"];%s}`, pattern, graphviz_internal(m, fmt.Sprintf("%x", rand.Int63())))
-}
-
-func graphviz_internal(m match.Matcher, id string) string {
-	buf := &bytes.Buffer{}
-
-	switch matcher := m.(type) {
-	case match.BTree:
-		fmt.Fprintf(buf, `"%s"[label="%s"];`, id, matcher.Value.String())
-		for _, m := range []match.Matcher{matcher.Left, matcher.Right} {
-			switch n := m.(type) {
-			case nil:
-				rnd := rand.Int63()
-				fmt.Fprintf(buf, `"%x"[label="<nil>"];`, rnd)
-				fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
-
-			default:
-				sub := fmt.Sprintf("%x", rand.Int63())
-				fmt.Fprintf(buf, `"%s"->"%s";`, id, sub)
-				fmt.Fprintf(buf, graphviz_internal(n, sub))
-			}
-		}
-
-	case match.AnyOf:
-		fmt.Fprintf(buf, `"%s"[label="AnyOf"];`, id)
-		for _, m := range matcher.Matchers {
-			rnd := rand.Int63()
-			fmt.Fprintf(buf, graphviz_internal(m, fmt.Sprintf("%x", rnd)))
-			fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
-		}
-
-	case match.EveryOf:
-		fmt.Fprintf(buf, `"%s"[label="EveryOf"];`, id)
-		for _, m := range matcher.Matchers {
-			rnd := rand.Int63()
-			fmt.Fprintf(buf, graphviz_internal(m, fmt.Sprintf("%x", rnd)))
-			fmt.Fprintf(buf, `"%s"->"%x";`, id, rnd)
-		}
-
-	default:
-		fmt.Fprintf(buf, `"%s"[label="%s"];`, id, m.String())
-	}
-
-	return buf.String()
-}

match/every_of.go

@@ -5,31 +5,50 @@ import (
 )
 
 type EveryOf struct {
-	Matchers Matchers
+	ms  []Matcher
+	min int
 }
 
-func NewEveryOf(m ...Matcher) EveryOf {
-	return EveryOf{Matchers(m)}
+func NewEveryOf(ms []Matcher) Matcher {
+	e := EveryOf{
+		ms:  ms,
+		min: maxLen(ms),
+	}
+	if mis, ok := MatchIndexers(ms); ok {
+		return IndexedEveryOf{e, mis}
+	}
+	return e
 }
 
-func (self *EveryOf) Add(m Matcher) error {
-	self.Matchers = append(self.Matchers, m)
-	return nil
+func (e EveryOf) MinLen() (n int) {
+	return e.min
 }
 
-func (self EveryOf) Len() (l int) {
-	for _, m := range self.Matchers {
-		if ml := m.Len(); l > 0 {
-			l += ml
-		} else {
-			return -1
+func (e EveryOf) Match(s string) bool {
+	for _, m := range e.ms {
+		if !m.Match(s) {
+			return false
+		}
+	}
+	return true
+}
+
+func (e EveryOf) Content(cb func(Matcher)) {
+	for _, m := range e.ms {
+		cb(m)
 	}
 }
 
-	return
+func (e EveryOf) String() string {
+	return fmt.Sprintf("<every_of:[%s]>", e.ms)
 }
 
-func (self EveryOf) Index(s string) (int, []int) {
+type IndexedEveryOf struct {
+	EveryOf
+	ms []MatchIndexer
+}
+
+func (e IndexedEveryOf) Index(s string) (int, []int) {
 	var index int
 	var offset int
 
@@ -39,7 +58,7 @@ func (self EveryOf) Index(s string) (int, []int) {
 	current := acquireSegments(len(s))
 
 	sub := s
-	for i, m := range self.Matchers {
+	for i, m := range e.ms {
 		idx, seg := m.Index(sub)
 		if idx == -1 {
 			releaseSegments(next)
@@ -84,16 +103,6 @@ func (self EveryOf) Index(s string) (int, []int) {
 	return index, current
 }
 
-func (self EveryOf) Match(s string) bool {
-	for _, m := range self.Matchers {
-		if !m.Match(s) {
-			return false
-		}
-	}
-
-	return true
-}
-
-func (self EveryOf) String() string {
-	return fmt.Sprintf("<every_of:[%s]>", self.Matchers)
+func (e IndexedEveryOf) String() string {
+	return fmt.Sprintf("<indexed_every_of:[%s]>", e.ms)
 }

match/every_of_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 )
 
-func TestEveryOfIndex(t *testing.T) {
+func TestIndexedEveryOf(t *testing.T) {
 	for id, test := range []struct {
 		matchers Matchers
 		fixture  string
@@ -33,7 +33,7 @@ func TestEveryOfIndex(t *testing.T) {
 			[]int{2},
 		},
 	} {
-		everyOf := NewEveryOf(test.matchers...)
+		everyOf := NewEveryOf(test.matchers).(IndexedEveryOf)
 		index, segments := everyOf.Index(test.fixture)
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)

match/list.go

@@ -2,48 +2,51 @@ package match
 
 import (
 	"fmt"
-	"github.com/gobwas/glob/util/runes"
 	"unicode/utf8"
+
+	"github.com/gobwas/glob/util/runes"
 )
 
 type List struct {
-	List []rune
-	Not  bool
+	rs  []rune
+	not bool
 }
 
-func NewList(list []rune, not bool) List {
-	return List{list, not}
+func NewList(rs []rune, not bool) List {
+	return List{rs, not}
 }
 
-func (self List) Match(s string) bool {
+func (l List) Match(s string) bool {
 	r, w := utf8.DecodeRuneInString(s)
 	if len(s) > w {
+		// Invalid rune.
 		return false
 	}
-
-	inList := runes.IndexRune(self.List, r) != -1
-	return inList == !self.Not
+	inList := runes.IndexRune(l.rs, r) != -1
+	return inList == !l.not
 }
 
-func (self List) Len() int {
-	return lenOne
+func (l List) MinLen() int {
+	return 1
 }
 
-func (self List) Index(s string) (int, []int) {
+func (l List) RunesCount() int {
+	return 1
+}
+
+func (l List) Index(s string) (int, []int) {
 	for i, r := range s {
-		if self.Not == (runes.IndexRune(self.List, r) == -1) {
+		if l.not == (runes.IndexRune(l.rs, r) == -1) {
 			return i, segmentsByRuneLength[utf8.RuneLen(r)]
 		}
 	}
-
 	return -1, nil
 }
 
-func (self List) String() string {
+func (l List) String() string {
 	var not string
-	if self.Not {
+	if l.not {
 		not = "!"
 	}
-
-	return fmt.Sprintf("<list:%s[%s]>", not, string(self.List))
+	return fmt.Sprintf("<list:%s[%s]>", not, string(l.rs))
 }

match/match.go

@@ -7,15 +7,63 @@ import (
 	"strings"
 )
 
-const lenOne = 1
-const lenZero = 0
-const lenNo = -1
-
 type Matcher interface {
 	Match(string) bool
+	MinLen() int
+}
+
+type Indexer interface {
 	Index(string) (int, []int)
-	Len() int
-	String() string
+}
+
+type Sizer interface {
+	RunesCount() int
+}
+
+type MatchIndexer interface {
+	Matcher
+	Indexer
+}
+
+type MatchSizer interface {
+	Matcher
+	Sizer
+}
+
+type MatchIndexSizer interface {
+	Matcher
+	Indexer
+	Sizer
+}
+
+type Container interface {
+	Content(func(Matcher))
+}
+
+func MatchIndexers(ms []Matcher) ([]MatchIndexer, bool) {
+	for _, m := range ms {
+		if _, ok := m.(MatchIndexer); !ok {
+			return nil, false
+		}
+	}
+	r := make([]MatchIndexer, len(ms))
+	for i := range r {
+		r[i] = ms[i].(MatchIndexer)
+	}
+	return r, true
+}
+
+func MatchIndexSizers(ms []Matcher) ([]MatchIndexSizer, bool) {
+	for _, m := range ms {
+		if _, ok := m.(MatchIndexSizer); !ok {
+			return nil, false
+		}
+	}
+	r := make([]MatchIndexSizer, len(ms))
+	for i := range r {
+		r[i] = ms[i].(MatchIndexSizer)
+	}
+	return r, true
 }
 
 type Matchers []Matcher

match/max.go

@@ -6,32 +6,31 @@ import (
 )
 
 type Max struct {
-	Limit int
+	n int
 }
 
-func NewMax(l int) Max {
-	return Max{l}
+func NewMax(n int) Max {
+	return Max{n}
 }
 
-func (self Max) Match(s string) bool {
-	var l int
+func (m Max) Match(s string) bool {
+	var n int
 	for range s {
-		l += 1
-		if l > self.Limit {
+		n += 1
+		if n > m.n {
 			return false
 		}
 	}
-
 	return true
 }
 
-func (self Max) Index(s string) (int, []int) {
-	segments := acquireSegments(self.Limit + 1)
+func (m Max) Index(s string) (int, []int) {
+	segments := acquireSegments(m.n + 1)
 	segments = append(segments, 0)
 	var count int
 	for i, r := range s {
 		count++
-		if count > self.Limit {
+		if count > m.n {
 			break
 		}
 		segments = append(segments, i+utf8.RuneLen(r))
@@ -40,10 +39,10 @@ func (self Max) Index(s string) (int, []int) {
 	return 0, segments
 }
 
-func (self Max) Len() int {
-	return lenNo
+func (m Max) MinLen() int {
+	return 0
 }
 
-func (self Max) String() string {
-	return fmt.Sprintf("<max:%d>", self.Limit)
+func (m Max) String() string {
+	return fmt.Sprintf("<max:%d>", m.n)
 }

match/min.go

@@ -6,52 +6,48 @@ import (
 )
 
 type Min struct {
-	Limit int
+	n int
 }
 
-func NewMin(l int) Min {
-	return Min{l}
+func NewMin(n int) Min {
+	return Min{n}
 }
 
-func (self Min) Match(s string) bool {
-	var l int
+func (m Min) Match(s string) bool {
+	var n int
 	for range s {
-		l += 1
-		if l >= self.Limit {
+		n += 1
+		if n >= m.n {
 			return true
 		}
 	}
-
 	return false
 }
 
-func (self Min) Index(s string) (int, []int) {
+func (m Min) Index(s string) (int, []int) {
 	var count int
 
-	c := len(s) - self.Limit + 1
+	c := len(s) - m.n + 1
 	if c <= 0 {
 		return -1, nil
 	}
-
 	segments := acquireSegments(c)
 	for i, r := range s {
 		count++
-		if count >= self.Limit {
+		if count >= m.n {
 			segments = append(segments, i+utf8.RuneLen(r))
 		}
 	}
-
 	if len(segments) == 0 {
 		return -1, nil
 	}
-
 	return 0, segments
 }
 
-func (self Min) Len() int {
-	return lenNo
+func (m Min) MinLen() int {
+	return m.n
 }
 
-func (self Min) String() string {
-	return fmt.Sprintf("<min:%d>", self.Limit)
+func (m Min) String() string {
+	return fmt.Sprintf("<min:%d>", m.n)
 }

match/nothing.go

@@ -18,8 +18,12 @@ func (self Nothing) Index(s string) (int, []int) {
 	return 0, segments0
 }
 
-func (self Nothing) Len() int {
-	return lenZero
+func (self Nothing) MinLen() int {
+	return 0
+}
+
+func (self Nothing) RunesCount() int {
+	return 0
 }
 
 func (self Nothing) String() string {

match/optimize.go

@@ -0,0 +1,422 @@
+package match
+
+import (
+	"fmt"
+
+	"github.com/gobwas/glob/internal/debug"
+	"github.com/gobwas/glob/util/runes"
+)
+
+func Optimize(m Matcher) (opt Matcher) {
+	if debug.Enabled {
+		defer func() {
+			a := fmt.Sprintf("%s", m)
+			b := fmt.Sprintf("%s", opt)
+			if a != b {
+				debug.EnterPrefix("optimized %s: -> %s", a, b)
+				debug.LeavePrefix()
+			}
+		}()
+	}
+	switch v := m.(type) {
+	case Any:
+		if len(v.sep) == 0 {
+			return NewSuper()
+		}
+
+	case List:
+		if v.not == false && len(v.rs) == 1 {
+			return NewText(string(v.rs))
+		}
+		return m
+
+	case Tree:
+		v.left = Optimize(v.left)
+		v.right = Optimize(v.right)
+
+		txt, ok := v.value.(Text)
+		if !ok {
+			return m
+		}
+
+		var (
+			leftNil  = v.left == nil || v.left == Nothing{}
+			rightNil = v.right == nil || v.right == Nothing{}
+		)
+		if leftNil && rightNil {
+			return NewText(txt.s)
+		}
+
+		_, leftSuper := v.left.(Super)
+		lp, leftPrefix := v.left.(Prefix)
+		la, leftAny := v.left.(Any)
+
+		_, rightSuper := v.right.(Super)
+		rs, rightSuffix := v.right.(Suffix)
+		ra, rightAny := v.right.(Any)
+
+		switch {
+		case leftSuper && rightSuper:
+			return NewContains(txt.s)
+
+		case leftSuper && rightNil:
+			return NewSuffix(txt.s)
+
+		case rightSuper && leftNil:
+			return NewPrefix(txt.s)
+
+		case leftNil && rightSuffix:
+			return NewPrefixSuffix(txt.s, rs.s)
+
+		case rightNil && leftPrefix:
+			return NewPrefixSuffix(lp.s, txt.s)
+
+		case rightNil && leftAny:
+			return NewSuffixAny(txt.s, la.sep)
+
+		case leftNil && rightAny:
+			return NewPrefixAny(txt.s, ra.sep)
+		}
+
+	case Container:
+		var (
+			first Matcher
+			n     int
+		)
+		v.Content(func(m Matcher) {
+			first = m
+			n++
+		})
+		if n == 1 {
+			return first
+		}
+		return m
+	}
+
+	return m
+}
+
+func Compile(ms []Matcher) (m Matcher, err error) {
+	if debug.Enabled {
+		debug.EnterPrefix("compiling %s", ms)
+		defer func() {
+			debug.Logf("-> %s, %v", m, err)
+			debug.LeavePrefix()
+		}()
+	}
+	if len(ms) == 0 {
+		return nil, fmt.Errorf("compile error: need at least one matcher")
+	}
+	if len(ms) == 1 {
+		return ms[0], nil
+	}
+	if m := glueMatchers(ms); m != nil {
+		return m, nil
+	}
+
+	var (
+		x   = -1
+		max = -2
+
+		wantText bool
+		indexer  MatchIndexer
+	)
+	for i, m := range ms {
+		mx, ok := m.(MatchIndexer)
+		if !ok {
+			continue
+		}
+		_, isText := m.(Text)
+		if wantText && !isText {
+			continue
+		}
+		n := m.MinLen()
+		if (!wantText && isText) || n > max {
+			max = n
+			x = i
+			indexer = mx
+			wantText = isText
+		}
+	}
+	if indexer == nil {
+		return nil, fmt.Errorf("can not index on matchers")
+	}
+
+	left := ms[:x]
+	var right []Matcher
+	if len(ms) > x+1 {
+		right = ms[x+1:]
+	}
+
+	var (
+		l Matcher = Nothing{}
+		r Matcher = Nothing{}
+	)
+	if len(left) > 0 {
+		l, err = Compile(left)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if len(right) > 0 {
+		r, err = Compile(right)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return NewTree(indexer, l, r), nil
+}
+
+func glueMatchers(ms []Matcher) Matcher {
+	if m := glueMatchersAsEvery(ms); m != nil {
+		return m
+	}
+	if m := glueMatchersAsRow(ms); m != nil {
+		return m
+	}
+	return nil
+}
+
+func glueMatchersAsRow(ms []Matcher) Matcher {
+	if len(ms) <= 1 {
+		return nil
+	}
+	var s []MatchIndexSizer
+	for _, m := range ms {
+		rsz, ok := m.(MatchIndexSizer)
+		if !ok {
+			return nil
+		}
+		s = append(s, rsz)
+	}
+	return NewRow(s)
+}
+
+func glueMatchersAsEvery(ms []Matcher) Matcher {
+	if len(ms) <= 1 {
+		return nil
+	}
+
+	var (
+		hasAny    bool
+		hasSuper  bool
+		hasSingle bool
+		min       int
+		separator []rune
+	)
+
+	for i, matcher := range ms {
+		var sep []rune
+
+		switch m := matcher.(type) {
+		case Super:
+			sep = []rune{}
+			hasSuper = true
+
+		case Any:
+			sep = m.sep
+			hasAny = true
+
+		case Single:
+			sep = m.sep
+			hasSingle = true
+			min++
+
+		case List:
+			if !m.not {
+				return nil
+			}
+			sep = m.rs
+			hasSingle = true
+			min++
+
+		default:
+			return nil
+		}
+
+		// initialize
+		if i == 0 {
+			separator = sep
+		}
+
+		if runes.Equal(sep, separator) {
+			continue
+		}
+
+		return nil
+	}
+
+	if hasSuper && !hasAny && !hasSingle {
+		return NewSuper()
+	}
+
+	if hasAny && !hasSuper && !hasSingle {
+		return NewAny(separator)
+	}
+
+	if (hasAny || hasSuper) && min > 0 && len(separator) == 0 {
+		return NewMin(min)
+	}
+
+	var every []Matcher
+	if min > 0 {
+		every = append(every, NewMin(min))
+		if !hasAny && !hasSuper {
+			every = append(every, NewMax(min))
+		}
+	}
+	if len(separator) > 0 {
+		every = append(every, NewAny(separator))
+	}
+
+	return NewEveryOf(every)
+}
+
+type result struct {
+	ms        []Matcher
+	matchers  int
+	maxMinLen int
+	sumMinLen int
+	nesting   int
+}
+
+func compareResult(a, b result) int {
+	if x := b.sumMinLen - a.sumMinLen; x != 0 {
+		return x
+	}
+	if x := len(a.ms) - len(b.ms); x != 0 {
+		return x
+	}
+	if x := a.nesting - b.nesting; x != 0 {
+		return x
+	}
+	if x := a.matchers - b.matchers; x != 0 {
+		return x
+	}
+	if x := b.maxMinLen - a.maxMinLen; x != 0 {
+		return x
+	}
+	return 0
+}
+
+func collapse(ms []Matcher, x Matcher, i, j int) (cp []Matcher) {
+	cp = make([]Matcher, len(ms)-(j-i)+1)
+	copy(cp[0:i], ms[0:i])
+	copy(cp[i+1:], ms[j:])
+	cp[i] = x
+	return cp
+}
+
+func matchersCount(ms []Matcher) (n int) {
+	n = len(ms)
+	for _, m := range ms {
+		n += countNestedMatchers(m)
+	}
+	return n
+}
+
+func countNestedMatchers(m Matcher) (n int) {
+	if c, _ := m.(Container); c != nil {
+		c.Content(func(m Matcher) {
+			n += 1 + countNestedMatchers(m)
+		})
+	}
+	return n
+}
+
+func nestingDepth(m Matcher) (depth int) {
+	c, ok := m.(Container)
+	if !ok {
+		return 0
+	}
+	var max int
+	c.Content(func(m Matcher) {
+		if d := nestingDepth(m); d > max {
+			max = d
+		}
+	})
+	return max + 1
+}
+
+func maxMinLen(ms []Matcher) (max int) {
+	for _, m := range ms {
+		if n := m.MinLen(); n > max {
+			max = n
+		}
+	}
+	return max
+}
+
+func sumMinLen(ms []Matcher) (sum int) {
+	for _, m := range ms {
+		sum += m.MinLen()
+	}
+	return sum
+}
+
+func maxNestingDepth(ms []Matcher) (max int) {
+	for _, m := range ms {
+		if n := nestingDepth(m); n > max {
+			max = n
+		}
+	}
+	return
+}
+
+func minimize(ms []Matcher, i, j int, best *result) *result {
+	if j > len(ms) {
+		j = 0
+		i++
+	}
+	if i > len(ms)-2 {
+		return best
+	}
+	if j == 0 {
+		j = i + 2
+	}
+	if g := glueMatchers(ms[i:j]); g != nil {
+		cp := collapse(ms, g, i, j)
+		r := result{
+			ms:        cp,
+			matchers:  matchersCount(cp),
+			sumMinLen: sumMinLen(cp),
+			maxMinLen: maxMinLen(cp),
+			nesting:   maxNestingDepth(cp),
+		}
+		if debug.Enabled {
+			debug.EnterPrefix(
+				"intermediate: %s (matchers:%d, summinlen:%d, maxminlen:%d, nesting:%d)",
+				cp, r.matchers, r.sumMinLen, r.maxMinLen, r.nesting,
+			)
+		}
+		if best == nil {
+			best = new(result)
+		}
+		if best.ms == nil || compareResult(r, *best) < 0 {
+			*best = r
+			if debug.Enabled {
+				debug.Logf("new best result")
+			}
+		}
+		best = minimize(cp, 0, 0, best)
+		if debug.Enabled {
+			debug.LeavePrefix()
+		}
+	}
+	return minimize(ms, i, j+1, best)
+}
+
+func Minimize(ms []Matcher) (m []Matcher) {
+	if debug.Enabled {
+		debug.EnterPrefix("minimizing %s", ms)
+		defer func() {
+			debug.Logf("-> %s", m)
+			debug.LeavePrefix()
+		}()
+	}
+	best := minimize(ms, 0, 0, nil)
+	if best == nil {
+		return ms
+	}
+	return best.ms
+}

match/optimize_test.go

@@ -0,0 +1,165 @@
+package match
+
+import (
+	"reflect"
+	"testing"
+)
+
+var separators = []rune{'.'}
+
+func TestCompile(t *testing.T) {
+	for _, test := range []struct {
+		in  []Matcher
+		exp Matcher
+	}{
+		{
+			[]Matcher{
+				NewSuper(),
+				NewSingle(nil),
+			},
+			NewMin(1),
+		},
+		{
+			[]Matcher{
+				NewAny(separators),
+				NewSingle(separators),
+			},
+			NewEveryOf([]Matcher{
+				NewMin(1),
+				NewAny(separators),
+			}),
+		},
+		{
+			[]Matcher{
+				NewSingle(nil),
+				NewSingle(nil),
+				NewSingle(nil),
+			},
+			NewEveryOf([]Matcher{
+				NewMin(3),
+				NewMax(3),
+			}),
+		},
+		{
+			[]Matcher{
+				NewList([]rune{'a'}, true),
+				NewAny([]rune{'a'}),
+			},
+			NewEveryOf([]Matcher{
+				NewMin(1),
+				NewAny([]rune{'a'}),
+			}),
+		},
+		{
+			[]Matcher{
+				NewSuper(),
+				NewSingle(separators),
+				NewText("c"),
+			},
+			NewTree(
+				NewText("c"),
+				NewTree(
+					NewSingle(separators),
+					NewSuper(),
+					Nothing{},
+				),
+				Nothing{},
+			),
+		},
+		{
+			[]Matcher{
+				NewAny(nil),
+				NewText("c"),
+				NewAny(nil),
+			},
+			NewTree(
+				NewText("c"),
+				NewAny(nil),
+				NewAny(nil),
+			),
+		},
+		{
+			[]Matcher{
+				NewRange('a', 'c', true),
+				NewList([]rune{'z', 't', 'e'}, false),
+				NewText("c"),
+				NewSingle(nil),
+			},
+			NewRow([]MatchIndexSizer{
+				NewRange('a', 'c', true),
+				NewList([]rune{'z', 't', 'e'}, false),
+				NewText("c"),
+				NewSingle(nil),
+			}),
+		},
+	} {
+		t.Run("", func(t *testing.T) {
+			act, err := Compile(test.in)
+			if err != nil {
+				t.Fatalf("Compile() error: %s", err)
+			}
+			if !reflect.DeepEqual(act, test.exp) {
+				t.Errorf(
+					"Compile():\nact: %#v;\nexp: %#v;\ngraphviz:\n%s\n%s",
+					act, test.exp,
+					Graphviz("act", act), Graphviz("exp", test.exp),
+				)
+			}
+		})
+	}
+}
+
+func TestMinimize(t *testing.T) {
+	for _, test := range []struct {
+		in, exp []Matcher
+	}{
+		{
+			in: []Matcher{
+				NewRange('a', 'c', true),
+				NewList([]rune{'z', 't', 'e'}, false),
+				NewText("c"),
+				NewSingle(nil),
+				NewAny(nil),
+			},
+			exp: []Matcher{
+				NewRow([]MatchIndexSizer{
+					NewRange('a', 'c', true),
+					NewList([]rune{'z', 't', 'e'}, false),
+					NewText("c"),
+				}),
+				NewMin(1),
+			},
+		},
+		{
+			in: []Matcher{
+				NewRange('a', 'c', true),
+				NewList([]rune{'z', 't', 'e'}, false),
+				NewText("c"),
+				NewSingle(nil),
+				NewAny(nil),
+				NewSingle(nil),
+				NewSingle(nil),
+				NewAny(nil),
+			},
+			exp: []Matcher{
+				NewRow([]MatchIndexSizer{
+					NewRange('a', 'c', true),
+					NewList([]rune{'z', 't', 'e'}, false),
+					NewText("c"),
+				}),
+				NewMin(3),
+			},
+		},
+	} {
+		t.Run("", func(t *testing.T) {
+			act := Minimize(test.in)
+
+			if !reflect.DeepEqual(act, test.exp) {
+				t.Errorf(
+					"Minimize():\nact: %#v;\nexp: %#v",
+					act, test.exp,
+				)
+			}
+		})
+	}
+}

match/prefix.go

@@ -7,20 +7,24 @@ import (
 )
 
 type Prefix struct {
-	Prefix string
+	s       string
+	minSize int
 }
 
 func NewPrefix(p string) Prefix {
-	return Prefix{p}
+	return Prefix{
+		s:       p,
+		minSize: utf8.RuneCountInString(p),
+	}
 }
 
-func (self Prefix) Index(s string) (int, []int) {
-	idx := strings.Index(s, self.Prefix)
+func (p Prefix) Index(s string) (int, []int) {
+	idx := strings.Index(s, p.s)
 	if idx == -1 {
 		return -1, nil
 	}
 
-	length := len(self.Prefix)
+	length := len(p.s)
 	var sub string
 	if len(s) > idx+length {
 		sub = s[idx+length:]
@@ -37,14 +41,14 @@ func (self Prefix) Index(s string) (int, []int) {
 	return idx, segments
 }
 
-func (self Prefix) Len() int {
-	return lenNo
+func (p Prefix) MinLen() int {
+	return p.minSize
 }
 
-func (self Prefix) Match(s string) bool {
-	return strings.HasPrefix(s, self.Prefix)
+func (p Prefix) Match(s string) bool {
+	return strings.HasPrefix(s, p.s)
 }
 
-func (self Prefix) String() string {
-	return fmt.Sprintf("<prefix:%s>", self.Prefix)
+func (p Prefix) String() string {
+	return fmt.Sprintf("<prefix:%s>", p.s)
 }

match/prefix_any.go

@@ -5,27 +5,28 @@ import (
 	"strings"
 	"unicode/utf8"
 
-	sutil "github.com/gobwas/glob/util/strings"
+	"github.com/gobwas/glob/util/runes"
 )
 
 type PrefixAny struct {
-	Prefix     string
-	Separators []rune
+	s      string
+	sep    []rune
+	minLen int
 }
 
 func NewPrefixAny(s string, sep []rune) PrefixAny {
-	return PrefixAny{s, sep}
+	return PrefixAny{s, sep, utf8.RuneCountInString(s)}
 }
 
-func (self PrefixAny) Index(s string) (int, []int) {
-	idx := strings.Index(s, self.Prefix)
+func (p PrefixAny) Index(s string) (int, []int) {
+	idx := strings.Index(s, p.s)
 	if idx == -1 {
 		return -1, nil
 	}
 
-	n := len(self.Prefix)
+	n := len(p.s)
 	sub := s[idx+n:]
-	i := sutil.IndexAnyRunes(sub, self.Separators)
+	i := runes.IndexAnyRune(sub, p.sep)
 	if i > -1 {
 		sub = sub[:i]
 	}
@@ -39,17 +40,17 @@ func (self PrefixAny) Index(s string) (int, []int) {
 	return idx, seg
 }
 
-func (self PrefixAny) Len() int {
-	return lenNo
+func (p PrefixAny) MinLen() int {
+	return p.minLen
 }
 
-func (self PrefixAny) Match(s string) bool {
-	if !strings.HasPrefix(s, self.Prefix) {
+func (p PrefixAny) Match(s string) bool {
+	if !strings.HasPrefix(s, p.s) {
 		return false
 	}
-	return sutil.IndexAnyRunes(s[len(self.Prefix):], self.Separators) == -1
+	return runes.IndexAnyRune(s[len(p.s):], p.sep) == -1
 }
 
-func (self PrefixAny) String() string {
-	return fmt.Sprintf("<prefix_any:%s![%s]>", self.Prefix, string(self.Separators))
+func (p PrefixAny) String() string {
+	return fmt.Sprintf("<prefix_any:%s![%s]>", p.s, string(p.sep))
 }

match/prefix_suffix.go

@@ -3,23 +3,27 @@ package match
 import (
 	"fmt"
 	"strings"
+	"unicode/utf8"
 )
 
 type PrefixSuffix struct {
-	Prefix, Suffix string
+	p, s   string
+	minLen int
 }
 
 func NewPrefixSuffix(p, s string) PrefixSuffix {
-	return PrefixSuffix{p, s}
+	pn := utf8.RuneCountInString(p)
+	sn := utf8.RuneCountInString(s)
+	return PrefixSuffix{p, s, pn + sn}
 }
 
-func (self PrefixSuffix) Index(s string) (int, []int) {
-	prefixIdx := strings.Index(s, self.Prefix)
+func (ps PrefixSuffix) Index(s string) (int, []int) {
+	prefixIdx := strings.Index(s, ps.p)
 	if prefixIdx == -1 {
 		return -1, nil
 	}
 
-	suffixLen := len(self.Suffix)
+	suffixLen := len(ps.s)
 	if suffixLen <= 0 {
 		return prefixIdx, []int{len(s) - prefixIdx}
 	}
@@ -30,7 +34,7 @@ func (self PrefixSuffix) Index(s string) (int, []int) {
 
 	segments := acquireSegments(len(s) - prefixIdx)
 	for sub := s[prefixIdx:]; ; {
-		suffixIdx := strings.LastIndex(sub, self.Suffix)
+		suffixIdx := strings.LastIndex(sub, ps.s)
 		if suffixIdx == -1 {
 			break
 		}
@@ -49,14 +53,14 @@ func (self PrefixSuffix) Index(s string) (int, []int) {
 	return prefixIdx, segments
 }
 
-func (self PrefixSuffix) Len() int {
-	return lenNo
+func (ps PrefixSuffix) Match(s string) bool {
+	return strings.HasPrefix(s, ps.p) && strings.HasSuffix(s, ps.s)
 }
 
-func (self PrefixSuffix) Match(s string) bool {
-	return strings.HasPrefix(s, self.Prefix) && strings.HasSuffix(s, self.Suffix)
+func (ps PrefixSuffix) MinLen() int {
+	return ps.minLen
 }
 
-func (self PrefixSuffix) String() string {
-	return fmt.Sprintf("<prefix_suffix:[%s,%s]>", self.Prefix, self.Suffix)
+func (ps PrefixSuffix) String() string {
+	return fmt.Sprintf("<prefix_suffix:[%s,%s]>", ps.p, ps.s)
 }

match/range.go

@@ -3,6 +3,8 @@ package match
 import (
 	"fmt"
 	"unicode/utf8"
+
+	"github.com/gobwas/glob/internal/debug"
 )
 
 type Range struct {
@@ -14,11 +16,19 @@ func NewRange(lo, hi rune, not bool) Range {
 	return Range{lo, hi, not}
 }
 
-func (self Range) Len() int {
-	return lenOne
+func (self Range) MinLen() int {
+	return 1
 }
 
-func (self Range) Match(s string) bool {
+func (self Range) RunesCount() int {
+	return 1
+}
+
+func (self Range) Match(s string) (ok bool) {
+	if debug.Enabled {
+		done := debug.Matching("range", s)
+		defer func() { done(ok) }()
+	}
 	r, w := utf8.DecodeRuneInString(s)
 	if len(s) > w {
 		return false
@@ -29,7 +39,11 @@ 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) (index int, segments []int) {
+	if debug.Enabled {
+		done := debug.Indexing("range", s)
+		defer func() { done(index, segments) }()
+	}
 	for i, r := range s {
 		if self.Not != (r >= self.Lo && r <= self.Hi) {
 			return i, segmentsByRuneLength[utf8.RuneLen(r)]

match/row.go

@@ -2,76 +2,89 @@ package match
 
 import (
 	"fmt"
+	"unicode/utf8"
+
+	"github.com/gobwas/glob/internal/debug"
+	"github.com/gobwas/glob/util/runes"
 )
 
 type Row struct {
-	Matchers    Matchers
-	RunesLength int
-	Segments    []int
+	ms    []MatchIndexSizer
+	runes int
+	seg   []int
 }
 
-func NewRow(len int, m ...Matcher) Row {
+func NewRow(ms []MatchIndexSizer) Row {
+	var r int
+	for _, m := range ms {
+		r += m.RunesCount()
+	}
 	return Row{
-		Matchers:    Matchers(m),
-		RunesLength: len,
-		Segments:    []int{len},
+		ms:    ms,
+		runes: r,
+		seg:   []int{r},
 	}
 }
 
-func (self Row) matchAll(s string) bool {
-	var idx int
-	for _, m := range self.Matchers {
-		length := m.Len()
-
-		var next, i int
-		for next = range s[idx:] {
-			i++
-			if i == length {
-				break
+func (r Row) Match(s string) (ok bool) {
+	if debug.Enabled {
+		done := debug.Matching("row", s)
+		defer func() { done(ok) }()
 	}
-		}
-
-		if i < length || !m.Match(s[idx:idx+next+1]) {
+	if !runes.ExactlyRunesCount(s, r.runes) {
 		return false
 	}
-
-		idx += next + 1
+	return r.matchAll(s)
 }
 
-	return true
+func (r Row) MinLen() int {
+	return r.runes
 }
 
-func (self Row) lenOk(s string) bool {
-	var i int
-	for range s {
-		i++
-		if i > self.RunesLength {
-			return false
-		}
-	}
-	return self.RunesLength == i
+func (r Row) RunesCount() int {
+	return r.runes
 }
 
-func (self Row) Match(s string) bool {
-	return self.lenOk(s) && self.matchAll(s)
+func (r Row) Index(s string) (index int, segments []int) {
+	if debug.Enabled {
+		done := debug.Indexing("row", s)
+		debug.Logf("row: %d vs %d", len(s), r.runes)
+		defer func() { done(index, segments) }()
 	}
 
-func (self Row) Len() (l int) {
-	return self.RunesLength
+	for j := 0; j <= len(s)-r.runes; { // NOTE: using len() here to avoid counting runes.
+		i, _ := r.ms[0].Index(s[j:])
+		if i == -1 {
+			return -1, nil
 		}
-
-func (self Row) Index(s string) (int, []int) {
-	for i := range s {
-		if len(s[i:]) < self.RunesLength {
-			break
-		}
-		if self.matchAll(s[i:]) {
-			return i, self.Segments
+		if r.matchAll(s[i:]) {
+			return j + i, r.seg
 		}
+		_, x := utf8.DecodeRuneInString(s[i:])
+		j += x
 	}
 	return -1, nil
 }
 
-func (self Row) String() string {
-	return fmt.Sprintf("<row_%d:[%s]>", self.RunesLength, self.Matchers)
+func (r Row) Content(cb func(Matcher)) {
+	for _, m := range r.ms {
+		cb(m)
+	}
+}
+
+func (r Row) String() string {
+	return fmt.Sprintf("<row_%d:%s>", r.runes, r.ms)
+}
+
+func (r Row) matchAll(s string) bool {
+	var i int
+	for _, m := range r.ms {
+		n := m.RunesCount()
+		sub := runes.Head(s[i:], n)
+		if !m.Match(sub) {
+			return false
+		}
+		i += len(sub)
+	}
+	return true
 }

match/row_test.go

@@ -7,36 +7,33 @@ import (
 
 func TestRowIndex(t *testing.T) {
 	for id, test := range []struct {
-		matchers Matchers
-		length   int
+		matchers []MatchIndexSizer
 		fixture  string
 		index    int
 		segments []int
 	}{
 		{
-			Matchers{
+			[]MatchIndexSizer{
 				NewText("abc"),
 				NewText("def"),
 				NewSingle(nil),
 			},
-			7,
 			"qweabcdefghij",
 			3,
 			[]int{7},
 		},
 		{
-			Matchers{
+			[]MatchIndexSizer{
 				NewText("abc"),
 				NewText("def"),
 				NewSingle(nil),
 			},
-			7,
 			"abcd",
 			-1,
 			nil,
 		},
 	} {
-		p := NewRow(test.length, test.matchers...)
+		p := NewRow(test.matchers)
 		index, segments := p.Index(test.fixture)
 		if index != test.index {
 			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
@@ -48,15 +45,11 @@ func TestRowIndex(t *testing.T) {
 }
 
 func BenchmarkRowIndex(b *testing.B) {
-	m := NewRow(
-		7,
-		Matchers{
+	m := NewRow([]MatchIndexSizer{
 		NewText("abc"),
 		NewText("def"),
 		NewSingle(nil),
-		}...,
-	)
-
+	})
 	for i := 0; i < b.N; i++ {
 		_, s := m.Index(bench_pattern)
 		releaseSegments(s)
@@ -64,15 +57,11 @@ func BenchmarkRowIndex(b *testing.B) {
 }
 
 func BenchmarkIndexRowParallel(b *testing.B) {
-	m := NewRow(
-		7,
-		Matchers{
+	m := NewRow([]MatchIndexSizer{
 		NewText("abc"),
 		NewText("def"),
 		NewSingle(nil),
-		}...,
-	)
-
+	})
 	b.RunParallel(func(pb *testing.PB) {
 		for pb.Next() {
 			_, s := m.Index(bench_pattern)

match/single.go

@@ -2,42 +2,48 @@ package match
 
 import (
 	"fmt"
-	"github.com/gobwas/glob/util/runes"
 	"unicode/utf8"
+
+	"github.com/gobwas/glob/util/runes"
 )
 
 // single represents ?
 type Single struct {
-	Separators []rune
+	sep []rune
 }
 
 func NewSingle(s []rune) Single {
 	return Single{s}
 }
 
-func (self Single) Match(s string) bool {
-	r, w := utf8.DecodeRuneInString(s)
-	if len(s) > w {
+func (s Single) Match(v string) bool {
+	r, w := utf8.DecodeRuneInString(v)
+	if len(v) > w {
 		return false
 	}
-
-	return runes.IndexRune(self.Separators, r) == -1
+	return runes.IndexRune(s.sep, r) == -1
 }
 
-func (self Single) Len() int {
-	return lenOne
+func (s Single) MinLen() int {
+	return 1
 }
 
-func (self Single) Index(s string) (int, []int) {
-	for i, r := range s {
-		if runes.IndexRune(self.Separators, r) == -1 {
+func (s Single) RunesCount() int {
+	return 1
+}
+
+func (s Single) Index(v string) (int, []int) {
+	for i, r := range v {
+		if runes.IndexRune(s.sep, r) == -1 {
 			return i, segmentsByRuneLength[utf8.RuneLen(r)]
 		}
 	}
-
 	return -1, nil
 }
 
-func (self Single) String() string {
-	return fmt.Sprintf("<single:![%s]>", string(self.Separators))
+func (s Single) String() string {
+	if len(s.sep) == 0 {
+		return "<single>"
+	}
+	return fmt.Sprintf("<single:![%s]>", string(s.sep))
 }

match/suffix.go

@@ -3,33 +3,34 @@ package match
 import (
 	"fmt"
 	"strings"
+	"unicode/utf8"
 )
 
 type Suffix struct {
-	Suffix string
+	s      string
+	minLen int
 }
 
 func NewSuffix(s string) Suffix {
-	return Suffix{s}
+	return Suffix{s, utf8.RuneCountInString(s)}
 }
 
-func (self Suffix) Len() int {
-	return lenNo
+func (s Suffix) MinLen() int {
+	return s.minLen
 }
 
-func (self Suffix) Match(s string) bool {
-	return strings.HasSuffix(s, self.Suffix)
+func (s Suffix) Match(v string) bool {
+	return strings.HasSuffix(v, s.s)
 }
 
-func (self Suffix) Index(s string) (int, []int) {
-	idx := strings.Index(s, self.Suffix)
+func (s Suffix) Index(v string) (int, []int) {
+	idx := strings.Index(v, s.s)
 	if idx == -1 {
 		return -1, nil
 	}
-
-	return 0, []int{idx + len(self.Suffix)}
+	return 0, []int{idx + len(s.s)}
 }
 
-func (self Suffix) String() string {
-	return fmt.Sprintf("<suffix:%s>", self.Suffix)
+func (s Suffix) String() string {
+	return fmt.Sprintf("<suffix:%s>", s.s)
 }

match/suffix_any.go

@@ -3,41 +3,43 @@ package match
 import (
 	"fmt"
 	"strings"
+	"unicode/utf8"
 
-	sutil "github.com/gobwas/glob/util/strings"
+	"github.com/gobwas/glob/util/runes"
 )
 
 type SuffixAny struct {
-	Suffix     string
-	Separators []rune
+	s      string
+	sep    []rune
+	minLen int
 }
 
 func NewSuffixAny(s string, sep []rune) SuffixAny {
-	return SuffixAny{s, sep}
+	return SuffixAny{s, sep, utf8.RuneCountInString(s)}
 }
 
-func (self SuffixAny) Index(s string) (int, []int) {
-	idx := strings.Index(s, self.Suffix)
+func (s SuffixAny) Index(v string) (int, []int) {
+	idx := strings.Index(v, s.s)
 	if idx == -1 {
 		return -1, nil
 	}
 
-	i := sutil.LastIndexAnyRunes(s[:idx], self.Separators) + 1
+	i := runes.LastIndexAnyRune(v[:idx], s.sep) + 1
 
-	return i, []int{idx + len(self.Suffix) - i}
+	return i, []int{idx + len(s.s) - i}
 }
 
-func (self SuffixAny) Len() int {
-	return lenNo
+func (s SuffixAny) MinLen() int {
+	return s.minLen
 }
 
-func (self SuffixAny) Match(s string) bool {
-	if !strings.HasSuffix(s, self.Suffix) {
+func (s SuffixAny) Match(v string) bool {
+	if !strings.HasSuffix(v, s.s) {
 		return false
 	}
-	return sutil.IndexAnyRunes(s[:len(s)-len(self.Suffix)], self.Separators) == -1
+	return runes.IndexAnyRune(v[:len(v)-len(s.s)], s.sep) == -1
 }
 
-func (self SuffixAny) String() string {
-	return fmt.Sprintf("<suffix_any:![%s]%s>", string(self.Separators), self.Suffix)
+func (s SuffixAny) String() string {
+	return fmt.Sprintf("<suffix_any:![%s]%s>", string(s.sep), s.s)
 }

match/super.go

@@ -10,24 +10,23 @@ func NewSuper() Super {
 	return Super{}
 }
 
-func (self Super) Match(s string) bool {
+func (s Super) Match(_ string) bool {
 	return true
 }
 
-func (self Super) Len() int {
-	return lenNo
+func (s Super) MinLen() int {
+	return 0
 }
 
-func (self Super) Index(s string) (int, []int) {
-	segments := acquireSegments(len(s) + 1)
-	for i := range s {
-		segments = append(segments, i)
+func (s Super) Index(v string) (int, []int) {
+	seg := acquireSegments(len(v) + 1)
+	for i := range v {
+		seg = append(seg, i)
 	}
-	segments = append(segments, len(s))
-
-	return 0, segments
+	seg = append(seg, len(v))
+	return 0, seg
 }
 
-func (self Super) String() string {
+func (s Super) String() string {
 	return fmt.Sprintf("<super>")
 }

match/text.go

@@ -8,38 +8,45 @@ import (
 
 // raw represents raw string to match
 type Text struct {
-	Str         string
-	RunesLength int
-	BytesLength int
-	Segments    []int
+	s     string
+	runes int
+	bytes int
+	seg   []int
 }
 
 func NewText(s string) Text {
 	return Text{
-		Str:         s,
-		RunesLength: utf8.RuneCountInString(s),
-		BytesLength: len(s),
-		Segments:    []int{len(s)},
+		s:     s,
+		runes: utf8.RuneCountInString(s),
+		bytes: len(s),
+		seg:   []int{len(s)},
 	}
 }
 
-func (self Text) Match(s string) bool {
-	return self.Str == s
+func (t Text) Match(s string) bool {
+	return t.s == s
 }
 
-func (self Text) Len() int {
-	return self.RunesLength
-}
-
-func (self Text) Index(s string) (int, []int) {
-	index := strings.Index(s, self.Str)
-	if index == -1 {
+func (t Text) Index(s string) (int, []int) {
+	i := strings.Index(s, t.s)
+	if i == -1 {
 		return -1, nil
 	}
-
-	return index, self.Segments
+	return i, t.seg
 }
 
-func (self Text) String() string {
-	return fmt.Sprintf("<text:`%v`>", self.Str)
+func (t Text) MinLen() int {
+	return t.runes
+}
+
+func (t Text) BytesCount() int {
+	return t.bytes
+}
+
+func (t Text) RunesCount() int {
+	return t.runes
+}
+
+func (t Text) String() string {
+	return fmt.Sprintf("<text:`%v`>", t.s)
 }

match/tree.go

@@ -0,0 +1,173 @@
+package match
+
+import (
+	"fmt"
+	"unicode/utf8"
+
+	"github.com/gobwas/glob/internal/debug"
+	"github.com/gobwas/glob/util/runes"
+)
+
+type Tree struct {
+	value MatchIndexer
+	left  Matcher
+	right Matcher
+
+	minLen int
+
+	runes  int
+	vrunes int
+	lrunes int
+	rrunes int
+}
+
+type SizedTree struct {
+	Tree
+}
+
+type IndexedTree struct {
+	value MatchIndexer
+	left  MatchIndexer
+	right MatchIndexer
+}
+
+func (st SizedTree) RunesCount() int {
+	return st.Tree.runes
+}
+
+func NewTree(v MatchIndexer, l, r Matcher) Matcher {
+	tree := Tree{
+		value: v,
+		left:  l,
+		right: r,
+	}
+	tree.minLen = v.MinLen()
+	if l != nil {
+		tree.minLen += l.MinLen()
+	}
+	if r != nil {
+		tree.minLen += r.MinLen()
+	}
+	var (
+		ls, lsz = l.(Sizer)
+		rs, rsz = r.(Sizer)
+		vs, vsz = v.(Sizer)
+	)
+	if lsz {
+		tree.lrunes = ls.RunesCount()
+	}
+	if rsz {
+		tree.rrunes = rs.RunesCount()
+	}
+	if vsz {
+		tree.vrunes = vs.RunesCount()
+	}
+	//li, lix := l.(MatchIndexer)
+	//ri, rix := r.(MatchIndexer)
+	if vsz && lsz && rsz {
+		tree.runes = tree.vrunes + tree.lrunes + tree.rrunes
+		return SizedTree{tree}
+	}
+	return tree
+}
+
+func (t Tree) MinLen() int {
+	return t.minLen
+}
+
+func (t Tree) Content(cb func(Matcher)) {
+	if t.left != nil {
+		cb(t.left)
+	}
+	cb(t.value)
+	if t.right != nil {
+		cb(t.right)
+	}
+}
+
+func (t Tree) Match(s string) (ok bool) {
+	if debug.Enabled {
+		done := debug.Matching("tree", s)
+		defer func() { done(ok) }()
+	}
+
+	n := len(s)
+	offset, limit := t.offsetLimit(s)
+
+	for len(s)-offset-limit >= t.vrunes {
+		if debug.Enabled {
+			debug.Logf(
+				"value %s indexing: %q (offset=%d; limit=%d)",
+				t.value, s[offset:n-limit], offset, limit,
+			)
+		}
+		index, segments := t.value.Index(s[offset : n-limit])
+		if debug.Enabled {
+			debug.Logf(
+				"value %s index: %d; %v",
+				t.value, index, segments,
+			)
+		}
+		if index == -1 {
+			releaseSegments(segments)
+			return false
+		}
+
+		if debug.Enabled {
+			debug.Logf("matching left: %q", s[:offset+index])
+		}
+		left := t.left.Match(s[:offset+index])
+		if debug.Enabled {
+			debug.Logf("matching left: -> %t", left)
+		}
+
+		if left {
+			for _, seg := range segments {
+				if debug.Enabled {
+					debug.Logf("matching right: %q", s[offset+index+seg:])
+				}
+				right := t.right.Match(s[offset+index+seg:])
+				if debug.Enabled {
+					debug.Logf("matching right: -> %t", right)
+				}
+				if right {
+					releaseSegments(segments)
+					return true
+				}
+			}
+		}
+
+		releaseSegments(segments)
+
+		_, x := utf8.DecodeRuneInString(s[offset+index:])
+		if x == 0 {
+			// No progress.
+			break
+		}
+		offset = offset + index + x
+	}
+
+	return false
+}
+
+// Retuns substring and offset/limit pair in bytes.
+func (t Tree) offsetLimit(s string) (offset, limit int) {
+	n := utf8.RuneCountInString(s)
+	if t.runes > n {
+		return 0, 0
+	}
+	if n := t.lrunes; n > 0 {
+		offset = len(runes.Head(s, n))
+	}
+	if n := t.rrunes; n > 0 {
+		limit = len(runes.Tail(s, n))
+	}
+	return
+}
+
+func (t Tree) String() string {
+	return fmt.Sprintf(
+		"<btree:[%v<-%s->%v]>",
+		t.left, t.value, t.right,
+	)
+}

match/tree_test.go

@@ -0,0 +1,104 @@
+package match
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestTree(t *testing.T) {
+	for _, test := range []struct {
+		tree Matcher
+		str  string
+		exp  bool
+	}{
+		{
+			NewTree(NewText("x"), NewText("y"), NewText("z")),
+			"0000x1111",
+			false,
+		},
+		{
+			NewTree(NewText("a"), NewSingle(nil), NewSingle(nil)),
+			"aaa",
+			true,
+		},
+		{
+			NewTree(NewText("abc"), NewSuper(), NewSuper()),
+			"abc",
+			true,
+		},
+		{
+			NewTree(NewText("a"), NewSingle(nil), NewSingle(nil)),
+			"aaa",
+			true,
+		},
+		{
+			NewTree(NewText("b"), NewSingle(nil), Nothing{}),
+			"bbb",
+			false,
+		},
+		{
+			NewTree(
+				NewText("c"),
+				NewTree(
+					NewSingle(nil),
+					NewSuper(),
+					Nothing{},
+				),
+				Nothing{},
+			),
+			"abc",
+			true,
+		},
+	} {
+		t.Run("", func(t *testing.T) {
+			act := test.tree.Match(test.str)
+			if act != test.exp {
+				fmt.Println(Graphviz("NIL", test.tree))
+				t.Errorf("match %q error: act: %t; exp: %t", test.str, act, test.exp)
+			}
+		})
+	}
+}
+
+type fakeMatcher struct {
+	len  int
+	segn int
+	name string
+}
+
+func (f *fakeMatcher) Match(string) bool {
+	return true
+}
+
+func (f *fakeMatcher) Index(s string) (int, []int) {
+	seg := make([]int, 0, f.segn)
+	for x := 0; x < f.segn; x++ {
+		seg = append(seg, f.segn)
+	}
+	return 0, seg
+}
+
+func (f *fakeMatcher) MinLen() int {
+	return f.len
+}
+
+func (f *fakeMatcher) String() string {
+	return f.name
+}
+
+func BenchmarkMatchTree(b *testing.B) {
+	l := &fakeMatcher{4, 3, "left_fake"}
+	r := &fakeMatcher{4, 3, "right_fake"}
+	v := &fakeMatcher{2, 3, "value_fake"}
+
+	// must be <= len(l + r + v)
+	fixture := "abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghij"
+
+	bt := NewTree(v, l, r)
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			bt.Match(fixture)
+		}
+	})
+}

match/util.go

@@ -0,0 +1,21 @@
+package match
+
+func minLen(ms []Matcher) (min int) {
+	for i, m := range ms {
+		n := m.MinLen()
+		if i == 0 || n < min {
+			min = n
+		}
+	}
+	return min
+}
+
+func maxLen(ms []Matcher) (max int) {
+	for i, m := range ms {
+		n := m.MinLen()
+		if i == 0 || n > max {
+			max = n
+		}
+	}
+	return max
+}

syntax/ast/optimize.go

@@ -0,0 +1,165 @@
+package ast
+
+import (
+	"reflect"
+)
+
+// Minimize tries to apply some heuristics to minimize number of nodes in given
+// t
+func Minimize(t *Node) *Node {
+	switch t.Kind {
+	case KindAnyOf:
+		return minimizeAnyOf(t)
+	default:
+		return nil
+	}
+}
+
+// minimizeAnyOf tries to find common children of given node of AnyOf pattern
+// it searches for common children from left and from right
+// if any common children are found – then it returns new optimized ast t
+// else it returns nil
+func minimizeAnyOf(t *Node) *Node {
+	if !SameKind(t.Children, KindPattern) {
+		return nil
+	}
+
+	commonLeft, commonRight := CommonChildren(t.Children)
+	commonLeftCount, commonRightCount := len(commonLeft), len(commonRight)
+	if commonLeftCount == 0 && commonRightCount == 0 { // there are no common parts
+		return nil
+	}
+
+	var result []*Node
+	if commonLeftCount > 0 {
+		result = append(result, NewNode(KindPattern, nil, commonLeft...))
+	}
+
+	var anyOf []*Node
+	for _, child := range t.Children {
+		reuse := child.Children[commonLeftCount : len(child.Children)-commonRightCount]
+		var node *Node
+		if len(reuse) == 0 {
+			// this pattern is completely reduced by commonLeft and commonRight patterns
+			// so it become nothing
+			node = NewNode(KindNothing, nil)
+		} else {
+			node = NewNode(KindPattern, nil, reuse...)
+		}
+		anyOf = AppendUnique(anyOf, node)
+	}
+	switch {
+	case len(anyOf) == 1 && anyOf[0].Kind != KindNothing:
+		result = append(result, anyOf[0])
+	case len(anyOf) > 1:
+		result = append(result, NewNode(KindAnyOf, nil, anyOf...))
+	}
+
+	if commonRightCount > 0 {
+		result = append(result, NewNode(KindPattern, nil, commonRight...))
+	}
+
+	return NewNode(KindPattern, nil, result...)
+}
+
+func CommonChildren(nodes []*Node) (commonLeft, commonRight []*Node) {
+	if len(nodes) <= 1 {
+		return
+	}
+
+	// find node that has least number of children
+	idx := OneWithLeastChildren(nodes)
+	if idx == -1 {
+		return
+	}
+	tree := nodes[idx]
+	treeLength := len(tree.Children)
+
+	// allocate max able size for rightCommon slice
+	// to get ability insert elements in reverse order (from end to start)
+	// without sorting
+	commonRight = make([]*Node, treeLength)
+	lastRight := treeLength // will use this to get results as commonRight[lastRight:]
+
+	var (
+		breakLeft   bool
+		breakRight  bool
+		commonTotal int
+	)
+	for i, j := 0, treeLength-1; commonTotal < treeLength && j >= 0 && !(breakLeft && breakRight); i, j = i+1, j-1 {
+		treeLeft := tree.Children[i]
+		treeRight := tree.Children[j]
+
+		for k := 0; k < len(nodes) && !(breakLeft && breakRight); k++ {
+			// skip least children node
+			if k == idx {
+				continue
+			}
+
+			restLeft := nodes[k].Children[i]
+			restRight := nodes[k].Children[j+len(nodes[k].Children)-treeLength]
+
+			breakLeft = breakLeft || !treeLeft.Equal(restLeft)
+
+			// disable searching for right common parts, if left part is already overlapping
+			breakRight = breakRight || (!breakLeft && j <= i)
+			breakRight = breakRight || !treeRight.Equal(restRight)
+		}
+
+		if !breakLeft {
+			commonTotal++
+			commonLeft = append(commonLeft, treeLeft)
+		}
+		if !breakRight {
+			commonTotal++
+			lastRight = j
+			commonRight[j] = treeRight
+		}
+	}
+
+	commonRight = commonRight[lastRight:]
+
+	return
+}
+
+func AppendUnique(target []*Node, val *Node) []*Node {
+	for _, n := range target {
+		if reflect.DeepEqual(n, val) {
+			return target
+		}
+	}
+	return append(target, val)
+}
+
+func SameKind(nodes []*Node, kind Kind) bool {
+	for _, n := range nodes {
+		if n.Kind != kind {
+			return false
+		}
+	}
+	return true
+}
+
+func OneWithLeastChildren(nodes []*Node) int {
+	min := -1
+	idx := -1
+	for i, n := range nodes {
+		if idx == -1 || (len(n.Children) < min) {
+			min = len(n.Children)
+			idx = i
+		}
+	}
+	return idx
+}
+
+func Equal(a, b []*Node) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i, av := range a {
+		if !av.Equal(b[i]) {
+			return false
+		}
+	}
+	return true
+}

syntax/ast/optimize_test.go

@@ -0,0 +1,126 @@
+package ast
+
+import (
+	"testing"
+)
+
+func TestCommonChildren(t *testing.T) {
+	for _, test := range []struct {
+		nodes []*Node
+		left  []*Node
+		right []*Node
+	}{
+		{
+			nodes: []*Node{
+				NewNode(KindNothing, nil,
+					NewNode(KindText, Text{"a"}),
+					NewNode(KindText, Text{"z"}),
+					NewNode(KindText, Text{"c"}),
+				),
+			},
+		},
+		{
+			nodes: []*Node{
+				NewNode(KindNothing, nil,
+					NewNode(KindText, Text{"a"}),
+					NewNode(KindText, Text{"z"}),
+					NewNode(KindText, Text{"c"}),
+				),
+				NewNode(KindNothing, nil,
+					NewNode(KindText, Text{"a"}),
+					NewNode(KindText, Text{"b"}),
+					NewNode(KindText, Text{"c"}),
+				),
+			},
+			left: []*Node{
+				NewNode(KindText, Text{"a"}),
+			},
+			right: []*Node{
+				NewNode(KindText, Text{"c"}),
+			},
+		},
+		{
+			nodes: []*Node{
+				NewNode(KindNothing, nil,
+					NewNode(KindText, Text{"a"}),
+					NewNode(KindText, Text{"b"}),
+					NewNode(KindText, Text{"c"}),
+					NewNode(KindText, Text{"d"}),
+				),
+				NewNode(KindNothing, nil,
+					NewNode(KindText, Text{"a"}),
+					NewNode(KindText, Text{"b"}),
+					NewNode(KindText, Text{"c"}),
+					NewNode(KindText, Text{"c"}),
+					NewNode(KindText, Text{"d"}),
+				),
+			},
+			left: []*Node{
+				NewNode(KindText, Text{"a"}),
+				NewNode(KindText, Text{"b"}),
+			},
+			right: []*Node{
+				NewNode(KindText, Text{"c"}),
+				NewNode(KindText, Text{"d"}),
+			},
+		},
+		{
+			nodes: []*Node{
+				NewNode(KindNothing, nil,
+					NewNode(KindText, Text{"a"}),
+					NewNode(KindText, Text{"b"}),
+					NewNode(KindText, Text{"c"}),
+				),
+				NewNode(KindNothing, nil,
+					NewNode(KindText, Text{"a"}),
+					NewNode(KindText, Text{"b"}),
+					NewNode(KindText, Text{"b"}),
+					NewNode(KindText, Text{"c"}),
+				),
+			},
+			left: []*Node{
+				NewNode(KindText, Text{"a"}),
+				NewNode(KindText, Text{"b"}),
+			},
+			right: []*Node{
+				NewNode(KindText, Text{"c"}),
+			},
+		},
+		{
+			nodes: []*Node{
+				NewNode(KindNothing, nil,
+					NewNode(KindText, Text{"a"}),
+					NewNode(KindText, Text{"d"}),
+				),
+				NewNode(KindNothing, nil,
+					NewNode(KindText, Text{"a"}),
+					NewNode(KindText, Text{"d"}),
+				),
+				NewNode(KindNothing, nil,
+					NewNode(KindText, Text{"a"}),
+					NewNode(KindText, Text{"e"}),
+				),
+			},
+			left: []*Node{
+				NewNode(KindText, Text{"a"}),
+			},
+			right: []*Node{},
+		},
+	} {
+		t.Run("", func(t *testing.T) {
+			left, right := CommonChildren(test.nodes)
+			if !Equal(left, test.left) {
+				t.Errorf(
+					"left, right := commonChildren(); left = %v; want %v",
+					left, test.left,
+				)
+			}
+			if !Equal(right, test.right) {
+				t.Errorf(
+					"left, right := commonChildren(); right = %v; want %v",
+					right, test.right,
+				)
+			}
+		})
+	}
+}

syntax/ast/parser.go

@@ -3,8 +3,9 @@ package ast
 import (
 	"errors"
 	"fmt"
-	"github.com/gobwas/glob/syntax/lexer"
 	"unicode/utf8"
+
+	"github.com/gobwas/glob/syntax/lexer"
 )
 
 type Lexer interface {

util/runes/runes.go

@@ -1,5 +1,98 @@
 package runes
 
+import (
+	"strings"
+	"unicode/utf8"
+)
+
+func Head(s string, r int) string {
+	var i, m int
+	for i < len(s) {
+		_, n := utf8.DecodeRuneInString(s[i:])
+		i += n
+		m += 1
+		if m == r {
+			break
+		}
+	}
+	return s[:i]
+}
+
+func Tail(s string, r int) string {
+	var i, n int
+	for i = len(s); i >= 0; {
+		var ok bool
+		for j := 1; j <= 4 && i-j >= 0; j++ {
+			v, _ := utf8.DecodeRuneInString(s[i-j:])
+			if v != utf8.RuneError {
+				i -= j
+				n++
+				ok = true
+				break
+			}
+		}
+		if !ok || n == r {
+			return s[i:]
+		}
+	}
+	return s[i:]
+}
+
+func ExactlyRunesCount(s string, n int) bool {
+	var m int
+	for range s {
+		m++
+		if m > n {
+			return false
+		}
+	}
+	return m == n
+}
+
+func AtLeastRunesCount(s string, n int) bool {
+	var m int
+	for range s {
+		m++
+		if m >= n {
+			return true
+		}
+	}
+	return false
+}
+
+func IndexAnyRune(s string, rs []rune) int {
+	for _, r := range rs {
+		if i := strings.IndexRune(s, r); i != -1 {
+			return i
+		}
+	}
+
+	return -1
+}
+
+func LastIndexAnyRune(s string, rs []rune) int {
+	for _, r := range rs {
+		i := -1
+		if 0 <= r && r < utf8.RuneSelf {
+			i = strings.LastIndexByte(s, byte(r))
+		} else {
+			sub := s
+			for len(sub) > 0 {
+				j := strings.IndexRune(s, r)
+				if j == -1 {
+					break
+				}
+				i = j
+				sub = sub[i+1:]
+			}
+		}
+		if i != -1 {
+			return i
+		}
+	}
+	return -1
+}
+
 func Index(s, needle []rune) int {
 	ls, ln := len(s), len(needle)
 
@@ -130,6 +223,7 @@ func IndexLastRune(s []rune, r rune) int {
 }
 
 func Equal(a, b []rune) bool {
+	// TODO use bytes.Equal with unsafe.
 	if len(a) == len(b) {
 		for i := 0; i < len(a); i++ {
 			if a[i] != b[i] {

util/strings/strings.go

@@ -1,39 +0,0 @@
-package strings
-
-import (
-	"strings"
-	"unicode/utf8"
-)
-
-func IndexAnyRunes(s string, rs []rune) int {
-	for _, r := range rs {
-		if i := strings.IndexRune(s, r); i != -1 {
-			return i
-		}
-	}
-
-	return -1
-}
-
-func LastIndexAnyRunes(s string, rs []rune) int {
-	for _, r := range rs {
-		i := -1
-		if 0 <= r && r < utf8.RuneSelf {
-			i = strings.LastIndexByte(s, byte(r))
-		} else {
-			sub := s
-			for len(sub) > 0 {
-				j := strings.IndexRune(s, r)
-				if j == -1 {
-					break
-				}
-				i = j
-				sub = sub[i+1:]
-			}
-		}
-		if i != -1 {
-			return i
-		}
-	}
-	return -1
-}