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.


Expr.fromJson(Map _json)


description String
Optional. Description of the expression. This is a longer text which describes the expression, e.g. when hovered over it in a UI.
read / write
expression String
Textual representation of an expression in Common Expression Language syntax.
read / write
hashCode int
The hash code for this object. [...]
read-only, inherited
location String
Optional. String indicating the location of the expression for error reporting, e.g. a file name and a position in the file.
read / write
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
title String
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.
read / write


noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toJson() Map<String, Object>
toString() String
Returns a string representation of this object.


operator ==(Object other) bool
The equality operator. [...]