Initial QSfera import

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

@@ -0,0 +1,50 @@
+// Copyright 2020 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 (
+	"fmt"
+
+	"github.com/open-policy-agent/opa/internal/semver"
+	"github.com/open-policy-agent/opa/v1/ast"
+	"github.com/open-policy-agent/opa/v1/topdown/builtins"
+)
+
+func builtinSemVerCompare(_ BuiltinContext, operands []*ast.Term, iter func(*ast.Term) error) error {
+	versionStringA, err := builtins.StringOperand(operands[0].Value, 1)
+	if err != nil {
+		return err
+	}
+
+	versionStringB, err := builtins.StringOperand(operands[1].Value, 2)
+	if err != nil {
+		return err
+	}
+
+	versionA, err := semver.Parse(string(versionStringA))
+	if err != nil {
+		return fmt.Errorf("operand 1: string %s is not a valid SemVer", versionStringA)
+	}
+	versionB, err := semver.Parse(string(versionStringB))
+	if err != nil {
+		return fmt.Errorf("operand 2: string %s is not a valid SemVer", versionStringB)
+	}
+
+	return iter(ast.InternedTerm(versionA.Compare(versionB)))
+}
+
+func builtinSemVerIsValid(_ BuiltinContext, operands []*ast.Term, iter func(*ast.Term) error) error {
+	versionString, err := builtins.StringOperand(operands[0].Value, 1)
+	if err == nil {
+		_, err = semver.Parse(string(versionString))
+	}
+
+	return iter(ast.InternedTerm(err == nil))
+}
+
+func init() {
+	RegisterBuiltinFunc(ast.SemVerCompare.Name, builtinSemVerCompare)
+	RegisterBuiltinFunc(ast.SemVerIsValid.Name, builtinSemVerIsValid)
+}