debug mechanics

compiler/compiler.go

@@ -5,10 +5,8 @@ package compiler
 
 import (
 	"fmt"
-	"os"
-	"strings"
-	"sync/atomic"
 
+	"github.com/gobwas/glob/internal/debug"
 	"github.com/gobwas/glob/match"
 	"github.com/gobwas/glob/syntax/ast"
 )
@@ -35,23 +33,30 @@ func compileNodes(ns []*ast.Node, sep []rune) ([]match.Matcher, error) {
 }
 
 func compile(tree *ast.Node, sep []rune) (m match.Matcher, err error) {
-	enter()
-	logf("compiling %s", tree)
+	if debug.Enabled {
+		debug.Enter()
+		debug.Logf("compiler: compiling %s", tree)
 		defer func() {
-		logf("result %s", m)
-		leave()
+			debug.Logf("compiler: result %s", m)
+			debug.Leave()
 		}()
+	}
 
 	// todo this could be faster on pattern_alternatives_combine_lite (see glob_test.go)
 	if n := ast.Minimize(tree); n != nil {
-		logf("minimized tree")
-		logf("\t%s", tree)
-		logf("\t%s", 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", n)
+			}
+		}
 		if err == nil {
 			return r, nil
 		}
-		logf("compile minimized tree failed: %v", err)
 	}
 
 	switch tree.Kind {
@@ -105,23 +110,3 @@ func compile(tree *ast.Node, sep []rune) (m match.Matcher, err error) {
 
 	return match.Optimize(m), nil
 }
-
-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)
-}

internal/debug/debug_disabled.go

@@ -0,0 +1,9 @@
+// +build !globdebug
+
+package debug
+
+const Enabled = false
+
+func Logf(_ string, _ ...interface{}) {}
+func Enter()                          {}
+func Leave()                          {}

internal/debug/debug_enabled.go

@@ -0,0 +1,32 @@
+// +build globdebug
+
+package debug
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"sync/atomic"
+)
+
+const Enabled = true
+
+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)
+}

match/tree.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"unicode/utf8"
 
+	"github.com/gobwas/glob/internal/debug"
 	"github.com/gobwas/glob/util/runes"
 )
 
@@ -74,21 +75,28 @@ func (t Tree) MinLen() int {
 }
 
 func (t Tree) Match(s string) (ok bool) {
-	enter()
-	logf("matching %q: %v", s, t)
+	if debug.Enabled {
+		debug.Enter()
+		debug.Logf("tree: matching %q: %v", s, t)
 		defer func(s string) {
-		logf("result: %q -> %v", s, ok)
-		leave()
+			debug.Logf("tree: result: %q -> %v", s, ok)
+			debug.Leave()
 		}(s)
+	}
 
 	offset, limit := t.offsetLimit(s)
 	q := s[offset : len(s)-limit]
-	logf("OFFSET/LIMIT: %d/%d %q of %q", offset, limit, q, s)
+
+	if debug.Enabled {
+		debug.Logf("tree: 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)
-		logf("INDEX #%d %q (%v)", index, q, t.value)
+		if debug.Enabled {
+			debug.Logf("tree: index #%d %q (%v)", index, q, t.value)
+		}
 		if index == -1 {
 			releaseSegments(segments)
 			return false
@@ -101,7 +109,9 @@ func (t Tree) Match(s string) (ok bool) {
 		} else {
 			left = l == ""
 		}
-		logf("LEFT %q %v", l, left)
+		if debug.Enabled {
+			debug.Logf("tree: left %q %v", l, left)
+		}
 		if left {
 			for _, seg := range segments {
 				var (
@@ -113,7 +123,9 @@ func (t Tree) Match(s string) (ok bool) {
 				} else {
 					right = r == ""
 				}
-				logf("RIGHT %q %v", r, right)
+				if debug.Enabled {
+					debug.Logf("tree: right %q %v", r, right)
+				}
 				if right {
 					releaseSegments(segments)
 					return true
@@ -125,7 +137,9 @@ func (t Tree) Match(s string) (ok bool) {
 		releaseSegments(segments)
 		q = q[x:]
 		offset += x
-		logf("SLICED TO %q", q)
+		if debug.Enabled {
+			debug.Logf("tree: sliced to %q", q)
+		}
 	}
 
 	return false