Expr class

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.

Constructors

Expr({String? description, String? expression, String? location, String? title})
Expr.fromJson(Map _json)

Properties

description ↔ String?
Description of the expression.
getter/setter pair
expression ↔ String?
Textual representation of an expression in Common Expression Language syntax.
getter/setter pair
hashCode → int
The hash code for this object.
no setterinherited
location ↔ String?
String indicating the location of the expression for error reporting, e.g. a file name and a position in the file.
getter/setter pair
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
title ↔ String?
Title for the expression, i.e. a short string describing its purpose.
getter/setter pair

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toJson() → Map<String, dynamic>
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited