Initial QSfera import

Server/vendor/github.com/open-policy-agent/opa/v1/topdown/comparison.go

@@ -0,0 +1,48 @@
+// Copyright 2016 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+package topdown
+
+import "github.com/open-policy-agent/opa/v1/ast"
+
+type compareFunc func(a, b ast.Value) bool
+
+func compareGreaterThan(a, b ast.Value) bool {
+	return ast.Compare(a, b) > 0
+}
+
+func compareGreaterThanEq(a, b ast.Value) bool {
+	return ast.Compare(a, b) >= 0
+}
+
+func compareLessThan(a, b ast.Value) bool {
+	return ast.Compare(a, b) < 0
+}
+
+func compareLessThanEq(a, b ast.Value) bool {
+	return ast.Compare(a, b) <= 0
+}
+
+func compareNotEq(a, b ast.Value) bool {
+	return ast.Compare(a, b) != 0
+}
+
+func compareEq(a, b ast.Value) bool {
+	return ast.Compare(a, b) == 0
+}
+
+func builtinCompare(cmp compareFunc) BuiltinFunc {
+	return func(_ BuiltinContext, operands []*ast.Term, iter func(*ast.Term) error) error {
+		return iter(ast.InternedTerm(cmp(operands[0].Value, operands[1].Value)))
+	}
+}
+
+func init() {
+	RegisterBuiltinFunc(ast.GreaterThan.Name, builtinCompare(compareGreaterThan))
+	RegisterBuiltinFunc(ast.GreaterThanEq.Name, builtinCompare(compareGreaterThanEq))
+	RegisterBuiltinFunc(ast.LessThan.Name, builtinCompare(compareLessThan))
+	RegisterBuiltinFunc(ast.LessThanEq.Name, builtinCompare(compareLessThanEq))
+	RegisterBuiltinFunc(ast.NotEqual.Name, builtinCompare(compareNotEq))
+	RegisterBuiltinFunc(ast.Equal.Name, builtinCompare(compareEq))
+}