Added eval package

src/core/MultiAssign.go

@@ -0,0 +1,31 @@
+package core
+
+import (
+	"git.urbach.dev/cli/q/src/asm"
+	"git.urbach.dev/cli/q/src/errors"
+	"git.urbach.dev/cli/q/src/expression"
+)
+
+// MultiAssign assigns multiple return values to local variables.
+func (f *Function) MultiAssign(left *expression.Expression, right *expression.Expression) error {
+	count := 0
+	_, err := f.CompileCall(right)
+
+	if err != nil {
+		return err
+	}
+
+	return left.EachLeaf(func(leaf *expression.Expression) error {
+		name := leaf.Token.Text(f.File.Bytes)
+		variable := f.VariableByName(name)
+
+		if variable == nil {
+			return errors.New(&errors.UnknownIdentifier{Name: name}, f.File, left.Token.Position)
+		}
+
+		f.RegisterRegister(asm.MOVE, variable.Register, f.CPU.Output[count])
+		f.UseVariable(variable)
+		count++
+		return nil
+	})
+}