Refactored code structure

src/build/core/CompileAssign.go

@@ -0,0 +1,19 @@
+package core
+
+import (
+	"git.akyoto.dev/cli/q/src/build/ast"
+	"git.akyoto.dev/cli/q/src/build/errors"
+)
+
+// CompileAssign compiles an assign statement.
+func (f *Function) CompileAssign(node *ast.Assign) error {
+	name := node.Name.Text()
+	variable, exists := f.variables[name]
+
+	if !exists {
+		return errors.New(&errors.UnknownIdentifier{Name: name}, f.File, node.Name.Position)
+	}
+
+	defer f.useVariable(variable)
+	return f.Execute(node.Operator, variable.Register, node.Value)
+}