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exp/compound.go

@@ -0,0 +1,19 @@
+package exp
+
+type compound struct {
+	t   CompoundType
+	rhs AppendableExpression
+}
+
+func NewCompoundExpression(ct CompoundType, rhs AppendableExpression) CompoundExpression {
+	return compound{t: ct, rhs: rhs}
+}
+
+func (c compound) Expression() Expression { return c }
+
+func (c compound) Clone() Expression {
+	return compound{t: c.t, rhs: c.rhs.Clone().(AppendableExpression)}
+}
+
+func (c compound) Type() CompoundType        { return c.t }
+func (c compound) RHS() AppendableExpression { return c.rhs }