Reduced memory usage

src/build/core/AddVariable.go

@@ -11,13 +11,5 @@ func (f *Function) AddVariable(variable *scope.Variable) {
 		f.Comment("%s = %s (%d uses)", variable.Name, variable.Register, variable.Alive)
 	}
 
-	s := f.CurrentScope()
-	variable.Scope = s
-
-	if s.Variables == nil {
-		s.Variables = map[string]*scope.Variable{}
-	}
-
-	s.Variables[variable.Name] = variable
-	s.Use(variable.Register)
+	f.CurrentScope().AddVariable(variable)
 }

src/build/core/VariableByName.go

@@ -4,5 +4,5 @@ import "git.akyoto.dev/cli/q/src/build/scope"
 
 // VariableByName returns the variable with the given name or `nil` if it doesn't exist.
 func (f *Function) VariableByName(name string) *scope.Variable {
-	return f.CurrentScope().Variables[name]
+	return f.CurrentScope().VariableByName(name)
 }

src/build/core/useVariable.go

@@ -11,7 +11,7 @@ func (f *Function) useVariable(variable *scope.Variable) {
 			continue
 		}
 
-		local := scope.Variables[variable.Name]
+		local := scope.VariableByName(variable.Name)
 
 		if local == nil {
 			continue

src/build/scope/Scope.go

@@ -6,7 +6,25 @@ import (
 
 // Scope represents an independent code block.
 type Scope struct {
-	Variables map[string]*Variable
+	Variables []*Variable
 	InLoop    bool
 	cpu.State
 }
+
+// AddVariable adds a new variable to the current scope.
+func (s *Scope) AddVariable(variable *Variable) {
+	variable.Scope = s
+	s.Variables = append(s.Variables, variable)
+	s.Use(variable.Register)
+}
+
+// VariableByName returns the variable with the given name or `nil` if it doesn't exist.
+func (s *Scope) VariableByName(name string) *Variable {
+	for _, v := range s.Variables {
+		if v.Name == name {
+			return v
+		}
+	}
+
+	return nil
+}

src/build/scope/Stack.go

@@ -26,25 +26,23 @@ func (stack *Stack) PushScope(body ast.AST, buffer []byte) *Scope {
 	if len(stack.Scopes) > 0 {
 		lastScope := stack.Scopes[len(stack.Scopes)-1]
 		s.State = lastScope.State
-		s.Variables = make(map[string]*Variable, len(lastScope.Variables))
+		s.Variables = make([]*Variable, 0, len(lastScope.Variables))
 		s.InLoop = lastScope.InLoop
 
-		for k, v := range lastScope.Variables {
+		for _, v := range lastScope.Variables {
 			count := ast.Count(body, buffer, token.Identifier, v.Name)
 
 			if count == 0 {
 				continue
 			}
 
-			s.Variables[k] = &Variable{
+			s.Variables = append(s.Variables, &Variable{
 				Name:     v.Name,
 				Register: v.Register,
 				Alive:    count,
+			})
 		}
 	}
-	} else {
-		s.Variables = map[string]*Variable{}
-	}
 
 	stack.Scopes = append(stack.Scopes, s)
 	return s