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exp/range.go

@@ -0,0 +1,62 @@
+package exp
+
+type (
+	ranged struct {
+		lhs Expression
+		rhs RangeVal
+		op  RangeOperation
+	}
+	rangeVal struct {
+		start interface{}
+		end   interface{}
+	}
+)
+
+// used internally to create an BETWEEN comparison RangeExpression
+func between(lhs Expression, rhs RangeVal) RangeExpression {
+	return NewRangeExpression(BetweenOp, lhs, rhs)
+}
+
+// used internally to create an NOT BETWEEN comparison RangeExpression
+func notBetween(lhs Expression, rhs RangeVal) RangeExpression {
+	return NewRangeExpression(NotBetweenOp, lhs, rhs)
+}
+
+func NewRangeExpression(op RangeOperation, lhs Expression, rhs RangeVal) RangeExpression {
+	return ranged{op: op, lhs: lhs, rhs: rhs}
+}
+
+func (r ranged) Clone() Expression {
+	return NewRangeExpression(r.op, r.lhs.Clone(), r.rhs)
+}
+
+func (r ranged) Expression() Expression {
+	return r
+}
+
+func (r ranged) RHS() RangeVal {
+	return r.rhs
+}
+
+func (r ranged) LHS() Expression {
+	return r.lhs
+}
+
+func (r ranged) Op() RangeOperation {
+	return r.op
+}
+
+// Creates a new Range to be used with a Between expression
+//
+//	exp.C("col").Between(exp.Range(1, 10))
+func NewRangeVal(start, end interface{}) RangeVal {
+	return rangeVal{start: start, end: end}
+}
+
+func (rv rangeVal) Start() interface{} {
+	return rv.start
+}
+
+func (rv rangeVal) End() interface{} {
+	return rv.end
+}