diff --git a/src/build/Function.go b/src/build/Function.go
index d3734e3..8bb5108 100644
--- a/src/build/Function.go
+++ b/src/build/Function.go
@@ -1,3 +1,7 @@
 package build
 
-type Function struct{}
+import "git.akyoto.dev/cli/q/src/token"
+
+type Function struct {
+	Tokens token.List
+}
diff --git a/src/build/Scan.go b/src/build/Scan.go
index 229cead..d1cba26 100644
--- a/src/build/Scan.go
+++ b/src/build/Scan.go
@@ -7,7 +7,6 @@ import (
 	"sync"
 
 	"git.akyoto.dev/cli/q/src/directory"
-	"git.akyoto.dev/cli/q/src/log"
 	"git.akyoto.dev/cli/q/src/token"
 )
 
@@ -60,8 +59,39 @@ func scanFile(path string, functions chan<- *Function) error {
 
 	tokens := token.Tokenize(contents)
 
-	for _, t := range tokens {
-		log.Info.Println(t.Kind, t.Position, strings.TrimSpace(t.String()))
+	var (
+		groupLevel    = 0
+		blockLevel    = 0
+		functionStart = -1
+	)
+
+	for i, t := range tokens {
+		switch t.Kind {
+		case token.Identifier:
+			if blockLevel == 0 && groupLevel == 0 {
+				functionStart = i
+			}
+
+		case token.GroupStart:
+			groupLevel++
+
+		case token.GroupEnd:
+			groupLevel--
+
+		case token.BlockStart:
+			blockLevel++
+
+		case token.BlockEnd:
+			blockLevel--
+
+			if blockLevel == 0 {
+				function := &Function{
+					Tokens: tokens[functionStart : i+1],
+				}
+
+				functions <- function
+			}
+		}
 	}
 
 	return nil