cel 0.2.0 has been released. https://gitlab.com/honeyryderchuck/cel-ruby Pure Ruby implementation of Google Common Expression Language, https://opensource.google/projects/cel.

The Common Expression Language (CEL) implements common semantics for expression evaluation, enabling different applications to more easily interoperate.

``` env = Cel::Environment.new(name: :string, group: :string) ast = env.compile('name.startsWith("/groups/" + group)') prg = env.program(ast) return_value = prg.evaluate(name: Cel::String.new("/groups/ acme.co/documents/secret-stuff"), group: Cel::String.new("acme.co"))) puts return_value #=> true ``` These are the announcements since the last release: ## [0.2.0] - 2023-01-17 ### Features #### Timestamp/Duration types Implementing `Cel::Timestamp` and `Cel::Duration` CEL types, along with support for functions for those types (such as `getDate`, `getDayOfYear`). ```ruby Cel::Environment.new.evaluate("timestamp('2022-12-25T00:00:00Z').getDate()") #=> 25 Cel::Environment.new.evaluate("duration('3600s10ms').getHours()") #=> 1 ``` #### Protobuf-to-CEL conversion Support for auto-conversion of certain protobuf messages in the `google.protobf` package to CEL types. https://github.com/google/cel-spec/blob/master/doc/langdef.md#dynamic-values ```ruby Cel::Environment.new.evaluate("google.protobuf.BoolValue{value: true}") #=> true Cel::Environment.new.evaluate("google.protobuf.Value{string_value: 'bla'}") #=> "bla" ``` #### Custom Functions `cel` supports the definition of custom functions in the environment, to be used in expressions: ```ruby Cel::Environment.new(foo: Cel::Function(:int, :int, return_type: :int) { |a, b| a + b }).evaluate("foo(2, 2)") #=> 4 ``` ### Expression encoding/decoding Expressions can now be encoded and decoded, to improve storage / reparsing to and from JSON, for example. ```ruby enc = Cel::Environment.new.encode("1 == 2") #=> ["op", ... store_to_db(JSON.dump(enc)) # then, somewhere else env = Cel::Environment.new ast = env.decode(JSON.parse(read_from_db)) env.evaluate(ast) #=> 3 ``` **NOTE**: This feature is only available in ruby 3.1 . ### Bugfixes * fixed parser bug disallowing identifiers composed "true" or "false" (such as "true_name"). ## [0.1.2] - 2022-11-10 point release to update links in rubygems. ## [0.1.1] - 2022-08-11 * fixed handling of comparison of primmitive types with Cel types. * fixed truffleruby compatibility by improving parser number handling.