Improved code generation

src/build/core/ExecuteLeaf.go

@@ -0,0 +1,37 @@
+package core
+
+import (
+	"strconv"
+
+	"git.akyoto.dev/cli/q/src/build/cpu"
+	"git.akyoto.dev/cli/q/src/build/errors"
+	"git.akyoto.dev/cli/q/src/build/token"
+)
+
+// ExecuteLeaf performs an operation on a register with the given leaf operand.
+func (f *Function) ExecuteLeaf(operation token.Token, register cpu.Register, operand token.Token) error {
+	switch operand.Kind {
+	case token.Identifier:
+		name := operand.Text()
+		variable, exists := f.variables[name]
+
+		if !exists {
+			return errors.New(&errors.UnknownIdentifier{Name: name}, f.File, operand.Position)
+		}
+
+		defer f.useVariable(variable)
+		return f.ExecuteRegisterRegister(operation, register, variable.Register)
+
+	case token.Number:
+		value := operand.Text()
+		number, err := strconv.Atoi(value)
+
+		if err != nil {
+			return err
+		}
+
+		return f.ExecuteRegisterNumber(operation, register, number)
+	}
+
+	return errors.New(errors.NotImplemented, f.File, operation.Position)
+}