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123 lines
3.7 KiB
Go
123 lines
3.7 KiB
Go
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cel
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import (
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"fmt"
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"github.com/google/cel-go/common"
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"github.com/google/cel-go/parser"
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exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
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)
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// CheckedExprToAst converts a checked expression proto message to an Ast.
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func CheckedExprToAst(checkedExpr *exprpb.CheckedExpr) *Ast {
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return CheckedExprToAstWithSource(checkedExpr, nil)
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}
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// CheckedExprToAstWithSource converts a checked expression proto message to an Ast,
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// using the provided Source as the textual contents.
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//
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// In general the source is not necessary unless the AST has been modified between the
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// `Parse` and `Check` calls as an `Ast` created from the `Parse` step will carry the source
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// through future calls.
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//
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// Prefer CheckedExprToAst if loading expressions from storage.
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func CheckedExprToAstWithSource(checkedExpr *exprpb.CheckedExpr, src common.Source) *Ast {
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refMap := checkedExpr.GetReferenceMap()
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if refMap == nil {
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refMap = map[int64]*exprpb.Reference{}
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}
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typeMap := checkedExpr.GetTypeMap()
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if typeMap == nil {
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typeMap = map[int64]*exprpb.Type{}
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}
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si := checkedExpr.GetSourceInfo()
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if si == nil {
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si = &exprpb.SourceInfo{}
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}
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if src == nil {
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src = common.NewInfoSource(si)
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}
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return &Ast{
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expr: checkedExpr.GetExpr(),
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info: si,
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source: src,
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refMap: refMap,
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typeMap: typeMap,
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}
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}
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// AstToCheckedExpr converts an Ast to an protobuf CheckedExpr value.
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//
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// If the Ast.IsChecked() returns false, this conversion method will return an error.
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func AstToCheckedExpr(a *Ast) (*exprpb.CheckedExpr, error) {
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if !a.IsChecked() {
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return nil, fmt.Errorf("cannot convert unchecked ast")
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}
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return &exprpb.CheckedExpr{
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Expr: a.Expr(),
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SourceInfo: a.SourceInfo(),
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ReferenceMap: a.refMap,
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TypeMap: a.typeMap,
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}, nil
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}
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// ParsedExprToAst converts a parsed expression proto message to an Ast.
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func ParsedExprToAst(parsedExpr *exprpb.ParsedExpr) *Ast {
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return ParsedExprToAstWithSource(parsedExpr, nil)
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}
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// ParsedExprToAstWithSource converts a parsed expression proto message to an Ast,
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// using the provided Source as the textual contents.
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//
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// In general you only need this if you need to recheck a previously checked
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// expression, or if you need to separately check a subset of an expression.
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//
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// Prefer ParsedExprToAst if loading expressions from storage.
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func ParsedExprToAstWithSource(parsedExpr *exprpb.ParsedExpr, src common.Source) *Ast {
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si := parsedExpr.GetSourceInfo()
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if si == nil {
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si = &exprpb.SourceInfo{}
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}
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if src == nil {
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src = common.NewInfoSource(si)
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}
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return &Ast{
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expr: parsedExpr.GetExpr(),
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info: si,
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source: src,
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}
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}
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// AstToParsedExpr converts an Ast to an protobuf ParsedExpr value.
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func AstToParsedExpr(a *Ast) (*exprpb.ParsedExpr, error) {
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return &exprpb.ParsedExpr{
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Expr: a.Expr(),
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SourceInfo: a.SourceInfo(),
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}, nil
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}
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// AstToString converts an Ast back to a string if possible.
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//
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// Note, the conversion may not be an exact replica of the original expression, but will produce
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// a string that is semantically equivalent and whose textual representation is stable.
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func AstToString(a *Ast) (string, error) {
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expr := a.Expr()
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info := a.SourceInfo()
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return parser.Unparse(expr, info)
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}
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