cel 0.4.0 has been released. cel is a 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. ```ruby require "cel" # set the environment env = Cel::Environment.new(name: :string, group: :string) # parse ast = env.compile('name.startsWith("/groups/" + group)') # check prg = env.program(ast) # evaluate prg.evaluate(name: Cel::String.new("/groups/acme.co/documents/secret-stuff "), group: Cel::String.new("acme.co")) #=> true # or do it all in one go env.evaluate('name.startsWith("/groups/" + group)', name: Cel::String.new("/groups/acme.co/documents/secret-stuff"), group: Cel::String.new("acme.co") ) ``` Here are the updates since the last release: ## [0.4.0] - 2025-11-18 ### Features `cel-ruby` supports the defined set of [CEL extensions]( https://github.com/google/cel-go/blob/master/ext/README.md): math, string, bind and encoders. ```ruby Cel::Environment.new.evaluate("math.bitShiftLeft(1, 2) ") #=> returns 4 ``` ### Improvements When the `tzinfo-data` gem is loaded, expressions will support human-friendly timezones, such as "US/Central", for timestamps. ## [0.3.1] - 2025-08-01 ### Improvements * Support for depth protection, using the defaults from the spec (ex: recursion depth of 32, nesting depth of 32), and supporting API to override them (ex: `Cel::Environment.new(max_recursion_depth: 42))`). * lazy-evaluating bindings to avoid upfront costly transformations of ruby objects into cel objects which are ultimately not used in expressions. ### Bugfixes * `has()` macro correctly works for maps.