package build

import (
	"git.akyoto.dev/cli/q/src/build/expression"
	"git.akyoto.dev/cli/q/src/build/token"
)

// CompileReturn compiles a return instruction.
func (f *Function) CompileReturn(tokens token.List) error {
	defer f.assembler.Return()

	if len(tokens) == 1 {
		return nil
	}

	value := expression.Parse(tokens[1:])

	if value == nil {
		return nil
	}

	defer value.Close()
	return f.ExpressionToRegister(value, f.cpu.Return[0])
}