-
Notifications
You must be signed in to change notification settings - Fork 73
Expand file tree
/
Copy pathchecked_expr_conversion_example.h
More file actions
59 lines (50 loc) · 2.22 KB
/
Copy pathchecked_expr_conversion_example.h
File metadata and controls
59 lines (50 loc) · 2.22 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef THIRD_PARTY_CEL_CPP_CODELAB_CHECKED_EXPR_CONVERSION_EXAMPLE_H_
#define THIRD_PARTY_CEL_CPP_CODELAB_CHECKED_EXPR_CONVERSION_EXAMPLE_H_
#include <memory>
#include "cel/expr/checked.pb.h"
#include "absl/status/statusor.h"
#include "common/ast.h"
#include "common/ast_proto.h"
#include "internal/status_macros.h"
namespace cel_codelab {
// Examples demonstrating how to convert between protobuf-based AST
// representations (cel::expr::CheckedExpr) and modern runtime AST
// representations (cel::Ast).
//
// When evaluating expressions with modern `cel::Runtime`, compilation via
// `cel::Compiler::Compile` returns a `cel::ValidationResult` holding a
// `cel::Ast` that can be passed directly to `runtime->CreateProgram(...)`.
//
// However, when working with external services or storage layers that persist
// or transmit serialized protobuf ASTs (`cel::expr::CheckedExpr`),
// conversion functions in `common/ast_proto.h` can be used
// to move between `cel::Ast` and `cel::expr::CheckedExpr`.
// Example: Convert a runtime `cel::Ast` to a `cel::expr::CheckedExpr`
// proto.
inline absl::StatusOr<cel::expr::CheckedExpr> ConvertAstToCheckedExpr(
const cel::Ast& ast) {
cel::expr::CheckedExpr checked_expr;
CEL_RETURN_IF_ERROR(cel::AstToCheckedExpr(ast, &checked_expr));
return checked_expr;
}
// Example: Convert a `cel::expr::CheckedExpr` proto to a runtime
// `cel::Ast`.
inline absl::StatusOr<std::unique_ptr<cel::Ast>> ConvertCheckedExprToAst(
const cel::expr::CheckedExpr& checked_expr) {
return cel::CreateAstFromCheckedExpr(checked_expr);
}
} // namespace cel_codelab
#endif // THIRD_PARTY_CEL_CPP_CODELAB_CHECKED_EXPR_CONVERSION_EXAMPLE_H_