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// Copyright 2021 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
//
//     http://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.

syntax = "proto3";

package google.type;

option go_package = "google.golang.org/genproto/googleapis/type/expr;expr";
option java_multiple_files = true;
option java_outer_classname = "ExprProto";
option java_package = "com.google.type";
option objc_class_prefix = "GTP";

// Represents a textual expression in the Common Expression Language (CEL)
// syntax. CEL is a C-like expression language. The syntax and semantics of CEL
// are documented at https://github.com/google/cel-spec.
//
// Example (Comparison):
//
//     title: "Summary size limit"
//     description: "Determines if a summary is less than 100 chars"
//     expression: "document.summary.size() < 100"
//
// Example (Equality):
//
//     title: "Requestor is owner"
//     description: "Determines if requestor is the document owner"
//     expression: "document.owner == request.auth.claims.email"
//
// Example (Logic):
//
//     title: "Public documents"
//     description: "Determine whether the document should be publicly visible"
//     expression: "document.type != 'private' && document.type != 'internal'"
//
// Example (Data Manipulation):
//
//     title: "Notification string"
//     description: "Create a notification string with a timestamp."
//     expression: "'New message received at ' + string(document.create_time)"
//
// The exact variables and functions that may be referenced within an expression
// are determined by the service that evaluates it. See the service
// documentation for additional information.
message Expr {
  // Textual representation of an expression in Common Expression Language
  // syntax.
  string expression = 1;

  // Optional. Title for the expression, i.e. a short string describing
  // its purpose. This can be used e.g. in UIs which allow to enter the
  // expression.
  string title = 2;

  // Optional. Description of the expression. This is a longer text which
  // describes the expression, e.g. when hovered over it in a UI.
  string description = 3;

  // Optional. String indicating the location of the expression for error
  // reporting, e.g. a file name and a position in the file.
  string location = 4;
}