wip

compiler/compiler.go

@@ -16,7 +16,6 @@ func Compile(tree *ast.Node, sep []rune) (match.Matcher, error) {
 	if err != nil {
 		return nil, err
 	}
-
 	return m, nil
 }
 
@@ -32,25 +31,29 @@ func compileNodes(ns []*ast.Node, sep []rune) ([]match.Matcher, error) {
 	return matchers, nil
 }
 
-func compile(tree *ast.Node, sep []rune) (m match.Matcher, err error) {
+func compile(node *ast.Node, sep []rune) (m match.Matcher, err error) {
 	if debug.Enabled {
-		debug.Enter()
-		debug.Logf("compiler: compiling %s", tree)
+		debug.EnterPrefix("compiler: compiling %s", node)
 		defer func() {
-			debug.Logf("compiler: result %s", m)
-			debug.Leave()
+			if err != nil {
+				debug.Logf("->! %v", err)
+			} else {
+				debug.Logf("-> %s", m)
+			}
+			debug.LeavePrefix()
 		}()
 	}
 
 	// todo this could be faster on pattern_alternatives_combine_lite (see glob_test.go)
-	if n := ast.Minimize(tree); n != nil {
+	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", tree)
+				debug.Logf("compiler: \t%s", node)
 				debug.Logf("compiler: \t%s", n)
 			}
 		}
@@ -59,19 +62,19 @@ func compile(tree *ast.Node, sep []rune) (m match.Matcher, err error) {
 		}
 	}
 
-	switch tree.Kind {
+	switch node.Kind {
 	case ast.KindAnyOf:
-		matchers, err := compileNodes(tree.Children, sep)
+		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 := compileNodes(tree.Children, sep)
+		matchers, err := compileNodes(node.Children, sep)
 		if err != nil {
 			return nil, err
 		}
@@ -93,15 +96,15 @@ 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:

compiler/compiler_test.go

@@ -11,44 +11,51 @@ import (
 var separators = []rune{'.'}
 
 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',
@@ -56,18 +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),
@@ -75,28 +84,30 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindSingle, nil),
 			),
 			sep: separators,
-			result: match.NewEveryOf([]match.Matcher{
+			exp: match.NewEveryOf([]match.Matcher{
 				match.NewMin(3),
 				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.NewTree(
+			exp: match.NewTree(
 				match.NewRow([]match.MatchIndexSizer{
 					match.NewText("abc"),
 					match.NewSingle(separators),
@@ -106,6 +117,7 @@ func TestCompiler(t *testing.T) {
 			),
 		},
 		{
+			// #10
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindText, ast.Text{"/"}),
 				ast.NewNode(ast.KindAnyOf, nil,
@@ -115,7 +127,7 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindSuper, nil),
 			),
 			sep: separators,
-			result: match.NewTree(
+			exp: match.NewTree(
 				match.NewText("/"),
 				nil,
 				match.NewTree(
@@ -129,6 +141,7 @@ func TestCompiler(t *testing.T) {
 			),
 		},
 		{
+			// #11
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindSuper, nil),
 				ast.NewNode(ast.KindSingle, nil),
@@ -136,7 +149,7 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindSingle, nil),
 			),
 			sep: separators,
-			result: match.NewTree(
+			exp: match.NewTree(
 				match.NewRow([]match.MatchIndexSizer{
 					match.NewSingle(separators),
 					match.NewText("abc"),
@@ -147,28 +160,32 @@ func TestCompiler(t *testing.T) {
 			),
 		},
 		{
+			// #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),
@@ -177,9 +194,10 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindAny, nil),
 				ast.NewNode(ast.KindAny, nil),
 			),
-			result: match.NewContains("abc"),
+			exp: match.NewContains("abc"),
 		},
 		{
+			// #16
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAny, nil),
 				ast.NewNode(ast.KindAny, nil),
@@ -189,14 +207,15 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindAny, nil),
 			),
 			sep: separators,
-			result: match.NewTree(
+			exp: match.NewTree(
 				match.NewText("abc"),
 				match.NewAny(separators),
 				match.NewAny(separators),
 			),
 		},
 		{
-			// TODO: THIS!
+			// #17
+			// pattern: "**?abc**?"
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindSuper, nil),
 				ast.NewNode(ast.KindSingle, nil),
@@ -204,19 +223,21 @@ func TestCompiler(t *testing.T) {
 				ast.NewNode(ast.KindSuper, nil),
 				ast.NewNode(ast.KindSingle, nil),
 			),
-			result: match.NewTree(
+			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,
@@ -228,9 +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,
@@ -249,7 +271,7 @@ func TestCompiler(t *testing.T) {
 					),
 				),
 			),
-			result: match.NewTree(
+			exp: match.NewTree(
 				match.NewText("abc"),
 				nil,
 				match.NewAnyOf(
@@ -260,12 +282,13 @@ func TestCompiler(t *testing.T) {
 			),
 		},
 		{
+			// #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.NewTree(
+			exp: match.NewTree(
 				match.NewRow([]match.MatchIndexSizer{
 					match.NewRange('a', 'z', false),
 					match.NewRange('a', 'x', true),
@@ -275,6 +298,7 @@ func TestCompiler(t *testing.T) {
 			),
 		},
 		{
+			// #22
 			ast: ast.NewNode(ast.KindPattern, nil,
 				ast.NewNode(ast.KindAnyOf, nil,
 					ast.NewNode(ast.KindPattern, nil,
@@ -289,7 +313,7 @@ func TestCompiler(t *testing.T) {
 					),
 				),
 			),
-			result: match.NewRow([]match.MatchIndexSizer{
+			exp: match.NewRow([]match.MatchIndexSizer{
 				match.NewText("abc"),
 				match.MustIndexedSizedAnyOf(
 					match.NewList([]rune{'a', 'b', 'c'}, false),
@@ -299,15 +323,19 @@ func TestCompiler(t *testing.T) {
 			}),
 		},
 	} {
-		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, match.Graphviz("", test.result.(match.Matcher)), match.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)),
+				)
+			}
+		})
 	}
 }

internal/debug/debug_disabled.go

@@ -4,6 +4,14 @@ package debug
 
 const Enabled = false
 
-func Logf(_ string, _ ...interface{}) {}
+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

@@ -6,27 +6,59 @@ import (
 	"fmt"
 	"os"
 	"strings"
-	"sync/atomic"
 )
 
 const Enabled = true
 
-var i = new(int32)
+var (
+	i      = 0
+	prefix = map[int]string{}
+)
 
 func Logf(f string, args ...interface{}) {
-	n := int(atomic.LoadInt32(i))
+	if f != "" && prefix[i] != "" {
+		f = ": " + f
+	}
 	fmt.Fprint(os.Stderr,
-		strings.Repeat("  ", n),
-		fmt.Sprintf("(%d) ", n),
+		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() {
-	atomic.AddInt32(i, 1)
+	i++
 }
 
 func Leave() {
-	atomic.AddInt32(i, -1)
+	i--
 }

match/any_of.go

@@ -2,6 +2,8 @@ package match
 
 import (
 	"fmt"
+
+	"github.com/gobwas/glob/internal/debug"
 )
 
 type AnyOf struct {
@@ -41,7 +43,11 @@ func MustIndexedSizedAnyOf(ms ...Matcher) MatchIndexSizer {
 	return NewAnyOf(ms...).(MatchIndexSizer)
 }
 
-func (a AnyOf) Match(s string) bool {
+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
@@ -54,8 +60,10 @@ func (a AnyOf) MinLen() (n int) {
 	return a.min
 }
 
-func (a AnyOf) Content() []Matcher {
-	return a.ms
+func (a AnyOf) Content(cb func(Matcher)) {
+	for _, m := range a.ms {
+		cb(m)
+	}
 }
 
 func (a AnyOf) String() string {
@@ -67,10 +75,17 @@ type IndexedAnyOf struct {
 	ms []MatchIndexer
 }
 
-func (a IndexedAnyOf) Index(s string) (int, []int) {
-	index := -1
-	segments := acquireSegments(len(s))
+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

match/any_of_test.go

@@ -41,7 +41,8 @@ func TestIndexedAnyOf(t *testing.T) {
 			[]int{1},
 		},
 	} {
-		a := NewAnyOf(test.matchers...).(IndexedAnyOf)
+		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)
@@ -49,5 +50,6 @@ func TestIndexedAnyOf(t *testing.T) {
 			if !reflect.DeepEqual(segments, test.segments) {
 				t.Errorf("#%d unexpected segments: exp: %v, act: %v", id, test.segments, segments)
 			}
+		})
 	}
 }

match/debug.go

@@ -54,20 +54,12 @@ func graphviz(m Matcher, id string) string {
 		}
 
 	case Container:
-		fmt.Fprintf(buf, `"%s"[label="*AnyOf"];`, id)
-		for _, m := range v.Content() {
+		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)
-		}
-
-	case EveryOf:
-		fmt.Fprintf(buf, `"%s"[label="EveryOf"];`, id)
-		for _, m := range v.ms {
-			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)

match/every_of.go

@@ -10,7 +10,10 @@ type EveryOf struct {
 }
 
 func NewEveryOf(ms []Matcher) Matcher {
-	e := EveryOf{ms, minLen(ms)}
+	e := EveryOf{
+		ms:  ms,
+		min: maxLen(ms),
+	}
 	if mis, ok := MatchIndexers(ms); ok {
 		return IndexedEveryOf{e, mis}
 	}
@@ -30,6 +33,12 @@ func (e EveryOf) Match(s string) bool {
 	return true
 }
 
+func (e EveryOf) Content(cb func(Matcher)) {
+	for _, m := range e.ms {
+		cb(m)
+	}
+}
+
 func (e EveryOf) String() string {
 	return fmt.Sprintf("<every_of:[%s]>", e.ms)
 }

match/match.go

@@ -37,7 +37,7 @@ type MatchIndexSizer interface {
 }
 
 type Container interface {
-	Content() []Matcher
+	Content(func(Matcher))
 }
 
 func MatchIndexers(ms []Matcher) ([]MatchIndexer, bool) {

match/optimize.go

@@ -3,23 +3,27 @@ package match
 import (
 	"fmt"
 
+	"github.com/gobwas/glob/internal/debug"
 	"github.com/gobwas/glob/util/runes"
 )
 
-func Optimize(m Matcher) Matcher {
+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 Container:
-		ms := v.Content()
-		if len(ms) == 1 {
-			return ms[0]
-		}
-		return m
-
 	case List:
 		if v.not == false && len(v.rs) == 1 {
 			return NewText(string(v.rs))
@@ -73,12 +77,33 @@ func Optimize(m Matcher) Matcher {
 		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) (Matcher, error) {
+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")
 	}
@@ -90,33 +115,40 @@ func Compile(ms []Matcher) (Matcher, error) {
 	}
 
 	var (
-		idx     = -1
-		maxLen  = -2
+		x   = -1
+		max = -2
+
+		wantText bool
 		indexer  MatchIndexer
 	)
 	for i, m := range ms {
-		mi, ok := m.(MatchIndexer)
+		mx, ok := m.(MatchIndexer)
 		if !ok {
 			continue
 		}
-		if n := m.MinLen(); n > maxLen {
-			maxLen = n
-			idx = i
-			indexer = mi
+		_, 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[:idx]
+	left := ms[:x]
 	var right []Matcher
-	if len(ms) > idx+1 {
-		right = ms[idx+1:]
+	if len(ms) > x+1 {
+		right = ms[x+1:]
 	}
 
 	var l, r Matcher
-	var err error
 	if len(left) > 0 {
 		l, err = Compile(left)
 		if err != nil {
@@ -239,40 +271,139 @@ func glueMatchersAsEvery(ms []Matcher) Matcher {
 	return NewEveryOf(every)
 }
 
-func Minimize(ms []Matcher) []Matcher {
-	var (
-		result Matcher
-		left   int
-		right  int
-		count  int
+type result struct {
+	ms       []Matcher
+	matchers int
+	minLen   int
+	nesting  int
+}
+
+func compareResult(a, b result) int {
+	if x := len(a.ms) - len(b.ms); x != 0 {
+		return x
+	}
+	if x := a.matchers - b.matchers; x != 0 {
+		return x
+	}
+	if x := b.minLen - a.minLen; x != 0 {
+		return x
+	}
+	if x := a.nesting - b.nesting; 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 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),
+			minLen:   maxMinLen(cp),
+			nesting:  maxNestingDepth(cp),
+		}
+		if debug.Enabled {
+			debug.EnterPrefix(
+				"intermediate: %s (matchers:%d, minlen:%d, nesting:%d)",
+				cp, r.matchers, r.minLen, r.nesting,
 			)
-	for l := 0; l < len(ms); l++ {
-		for r := len(ms); r > l; r-- {
-			if glued := glueMatchers(ms[l:r]); glued != nil {
-				var swap bool
-				if result == nil {
-					swap = true
-				} else {
-					swap = glued.MinLen() > result.MinLen() || count < r-l
 		}
-				if swap {
-					result = glued
-					left = l
-					right = r
-					count = r - l
+		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()
 		}
 	}
-	if result == nil {
+	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
 	}
-	next := append(append([]Matcher{}, ms[:left]...), result)
-	if right < len(ms) {
-		next = append(next, ms[right:]...)
-	}
-	if len(next) == len(ms) {
-		return next
-	}
-	return Minimize(next)
+	return best.ms
 }

match/optimize_test.go

@@ -3,12 +3,12 @@ package match
 import (
 	"reflect"
 	"testing"
-
-	"github.com/gobwas/glob/match"
 )
 
+var separators = []rune{'.'}
+
 func TestCompile(t *testing.T) {
-	for id, test := range []struct {
+	for _, test := range []struct {
 		in  []Matcher
 		exp Matcher
 	}{
@@ -26,7 +26,7 @@ func TestCompile(t *testing.T) {
 			},
 			NewEveryOf([]Matcher{
 				NewMin(1),
-				NewContains(string(separators)),
+				NewAny(separators),
 			}),
 		},
 		{
@@ -47,7 +47,7 @@ func TestCompile(t *testing.T) {
 			},
 			NewEveryOf([]Matcher{
 				NewMin(1),
-				NewContains("a"),
+				NewAny([]rune{'a'}),
 			}),
 		},
 		{
@@ -58,7 +58,7 @@ func TestCompile(t *testing.T) {
 			},
 			NewTree(
 				NewText("c"),
-				NewBTree(
+				NewTree(
 					NewSingle(separators),
 					NewSuper(),
 					nil,
@@ -93,71 +93,73 @@ func TestCompile(t *testing.T) {
 			}),
 		},
 	} {
+		t.Run("", func(t *testing.T) {
 			act, err := Compile(test.in)
 			if err != nil {
-			t.Errorf("#%d compile matchers error: %s", id, err)
-			continue
+				t.Fatalf("Compile() error: %s", err)
 			}
 			if !reflect.DeepEqual(act, test.exp) {
-			t.Errorf("#%d unexpected compile matchers result:\nact: %#v;\nexp: %#v", id, act, test.exp)
-			continue
+				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 id, test := range []struct {
-		in, exp []match.Matcher
+	for _, test := range []struct {
+		in, exp []Matcher
 	}{
 		{
-			[]match.Matcher{
-				match.NewRange('a', 'c', true),
-				match.NewList([]rune{'z', 't', 'e'}, false),
-				match.NewText("c"),
-				match.NewSingle(nil),
-				match.NewAny(nil),
+			in: []Matcher{
+				NewRange('a', 'c', true),
+				NewList([]rune{'z', 't', 'e'}, false),
+				NewText("c"),
+				NewSingle(nil),
+				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),
+			exp: []Matcher{
+				NewRow([]MatchIndexSizer{
+					NewRange('a', 'c', true),
+					NewList([]rune{'z', 't', 'e'}, false),
+					NewText("c"),
+				}),
+				NewMin(1),
 			},
 		},
 		{
-			[]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),
+			in: []Matcher{
+				NewRange('a', 'c', true),
+				NewList([]rune{'z', 't', 'e'}, false),
+				NewText("c"),
+				NewSingle(nil),
+				NewAny(nil),
+				NewSingle(nil),
+				NewSingle(nil),
+				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),
+			exp: []Matcher{
+				NewRow([]MatchIndexSizer{
+					NewRange('a', 'c', true),
+					NewList([]rune{'z', 't', 'e'}, false),
+					NewText("c"),
+				}),
+				NewMin(3),
 			},
 		},
 	} {
-		act := minimizeMatchers(test.in)
+		t.Run("", func(t *testing.T) {
+			act := Minimize(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
-		}
+				t.Errorf(
+					"Minimize():\nact: %#v;\nexp: %#v",
+					act, test.exp,
+				)
+			}
+		})
 	}
 }

match/range.go

@@ -3,6 +3,8 @@ package match
 import (
 	"fmt"
 	"unicode/utf8"
+
+	"github.com/gobwas/glob/internal/debug"
 )
 
 type Range struct {
@@ -22,7 +24,11 @@ func (self Range) RunesCount() int {
 	return 1
 }
 
-func (self Range) Match(s string) bool {
+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
@@ -33,7 +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

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"unicode/utf8"
 
+	"github.com/gobwas/glob/internal/debug"
 	"github.com/gobwas/glob/util/runes"
 )
 
@@ -25,7 +26,11 @@ func NewRow(ms []MatchIndexSizer) Row {
 	}
 }
 
-func (r Row) Match(s string) bool {
+func (r Row) Match(s string) (ok bool) {
+	if debug.Enabled {
+		done := debug.Matching("row", s)
+		defer func() { done(ok) }()
+	}
 	if !runes.ExactlyRunesCount(s, r.runes) {
 		return false
 	}
@@ -40,8 +45,14 @@ func (r Row) RunesCount() int {
 	return r.runes
 }
 
-func (r Row) Index(s string) (int, []int) {
-	for j := 0; j < len(s)-r.runes; {
+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) }()
+	}
+
+	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
@@ -55,8 +66,14 @@ func (r Row) Index(s string) (int, []int) {
 	return -1, nil
 }
 
+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)
+	return fmt.Sprintf("<row_%d:%s>", r.runes, r.ms)
 }
 
 func (r Row) matchAll(s string) bool {

match/single.go

@@ -42,5 +42,8 @@ func (s Single) Index(v string) (int, []int) {
 }
 
 func (s Single) String() string {
+	if len(s.sep) == 0 {
+		return "<single>"
+	}
 	return fmt.Sprintf("<single:![%s]>", string(s.sep))
 }

match/tree.go

@@ -74,29 +74,32 @@ 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 {
-		debug.Enter()
-		debug.Logf("tree: matching %q: %v", s, t)
-		defer func(s string) {
-			debug.Logf("tree: result: %q -> %v", s, ok)
-			debug.Leave()
-		}(s)
+		done := debug.Matching("tree", s)
+		defer func() { done(ok) }()
 	}
 
 	offset, limit := t.offsetLimit(s)
 	q := s[offset : len(s)-limit]
 
 	if debug.Enabled {
-		debug.Logf("tree: offset/limit: %d/%d %q of %q", offset, limit, q, s)
+		debug.Logf("offset/limit: %d/%d: %q of %q", offset, limit, q, s)
 	}
 
 	for len(q) >= t.vrunes {
 		// search for matching part in substring
 		index, segments := t.value.Index(q)
-		if debug.Enabled {
-			debug.Logf("tree: index #%d %q (%v)", index, q, t.value)
-		}
 		if index == -1 {
 			releaseSegments(segments)
 			return false
@@ -110,7 +113,7 @@ func (t Tree) Match(s string) (ok bool) {
 			left = l == ""
 		}
 		if debug.Enabled {
-			debug.Logf("tree: left %q %v", l, left)
+			debug.Logf("left %q: -> %t", l, left)
 		}
 		if left {
 			for _, seg := range segments {
@@ -124,7 +127,7 @@ func (t Tree) Match(s string) (ok bool) {
 					right = r == ""
 				}
 				if debug.Enabled {
-					debug.Logf("tree: right %q %v", r, right)
+					debug.Logf("right %q: -> %t", r, right)
 				}
 				if right {
 					releaseSegments(segments)

match/util.go

@@ -9,3 +9,13 @@ func minLen(ms []Matcher) (min int) {
 	}
 	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
+}