Class: Puppet::Pops::Evaluator::Closure
Overview
A Closure represents logic bound to a particular scope. As long as the runtime (basically the scope implementation) has the behavior of Puppet 3x it is not safe to return and later use this closure.
The 3x scope is essentially a named scope with an additional internal local/ephemeral nested scope state. In 3x there is no way to directly refer to the nested scopes, instead, the named scope must be in a particular state. Specifically, closures that require a local/ephemeral scope to exist at a later point will fail. It is safe to call a closure (even with 3x scope) from the very same place it was defined, but not returning it and expecting the closure to reference the scope’s state at the point it was created.
Note that this class is a CallableSignature, and the methods defined there should be used as the API for obtaining information in a callable-implementation agnostic way.
Defined Under Namespace
Classes: Dynamic, Named
Constant Summary
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- CLOSURE_NAME =
'lambda'.freeze
Instance Attribute Summary collapse
Instance Method Summary
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#args_range, #argument_mismatch_handler?, #block_range, #block_type, #infinity?
Constructor Details
#initialize(evaluator, model) ⇒ Closure
Returns a new instance of Closure.
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# File 'lib/puppet/pops/evaluator/closure.rb', line 60
def initialize(evaluator, model)
@evaluator = evaluator
@model = model
end
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Instance Attribute Details
#enclosing_scope ⇒ Object
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# File 'lib/puppet/pops/evaluator/closure.rb', line 58
def enclosing_scope
@enclosing_scope
end
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#evaluator ⇒ Object
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# File 'lib/puppet/pops/evaluator/closure.rb', line 56
def evaluator
@evaluator
end
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# File 'lib/puppet/pops/evaluator/closure.rb', line 57
def model
@model
end
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Instance Method Details
#block_name ⇒ Object
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# File 'lib/puppet/pops/evaluator/closure.rb', line 161
def block_name
'unsupported_block'
end
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#call(*args) ⇒ Object
Evaluates a closure in its enclosing scope after having matched given arguments with parameters (from left to right)
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# File 'lib/puppet/pops/evaluator/closure.rb', line 67
def call(*args)
call_with_scope(enclosing_scope, args)
end
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#call_by_name(args_hash, enforce_parameters) ⇒ Object
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# File 'lib/puppet/pops/evaluator/closure.rb', line 85
def call_by_name(args_hash, enforce_parameters)
call_by_name_internal(enclosing_scope, args_hash, enforce_parameters)
end
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#call_by_name_with_scope(scope, args_hash, enforce_parameters) ⇒ Object
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# File 'lib/puppet/pops/evaluator/closure.rb', line 81
def call_by_name_with_scope(scope, args_hash, enforce_parameters)
call_by_name_internal(scope, args_hash, enforce_parameters)
end
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#closure_name ⇒ Object
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# File 'lib/puppet/pops/evaluator/closure.rb', line 169
def closure_name()
CLOSURE_NAME
end
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#invoke(instance, calling_scope, args, &block) ⇒ Object
This method is part of a private API.
You should avoid using this method if possible, as it may be removed or be changed in the future.
This method makes a Closure compatible with a Dispatch. This is used when the closure is wrapped in a Function and the function is called. (Saves an extra Dispatch that just delegates to a Closure and avoids having two checks of the argument type/arity validity).
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# File 'lib/puppet/pops/evaluator/closure.rb', line 75
def invoke(instance, calling_scope, args, &block)
enclosing_scope.with_global_scope do |global_scope|
call_with_scope(global_scope, args, &block)
end
end
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#last_captures_rest? ⇒ Boolean
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# File 'lib/puppet/pops/evaluator/closure.rb', line 155
def last_captures_rest?
last = @model.parameters[-1]
last && last.captures_rest
end
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#parameter_count ⇒ Integer
Returns the number of parameters (required and optional)
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# File 'lib/puppet/pops/evaluator/closure.rb', line 130
def parameter_count
@model.parameters.size
end
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#parameter_names ⇒ Object
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# File 'lib/puppet/pops/evaluator/closure.rb', line 136
def parameter_names
@model.parameters.collect(&:name)
end
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#parameters ⇒ Object
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# File 'lib/puppet/pops/evaluator/closure.rb', line 124
def parameters
@model.parameters
end
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#params_struct ⇒ Object
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# File 'lib/puppet/pops/evaluator/closure.rb', line 150
def params_struct
@params_struct ||= create_params_struct
end
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#return_type ⇒ Object
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# File 'lib/puppet/pops/evaluator/closure.rb', line 140
def return_type
@return_type ||= create_return_type
end
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# File 'lib/puppet/pops/evaluator/closure.rb', line 145
def type
@callable ||= create_callable_type
end
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