Class: Puppet::Parser::AST::PopsBridge::Expression

Inherits:
Leaf
  • Object
show all
Defined in:
lib/puppet/parser/ast/pops_bridge.rb

Overview

Bridges to one Pops Model Expression The @value is the expression This is used to represent the body of a class, definition, or node, and for each parameter’s default value expression.

Instance Attribute Summary

Attributes inherited from Leaf

#type, #value

Instance Method Summary collapse

Methods inherited from Leaf

#match

Constructor Details

#initialize(args) ⇒ Expression

Returns a new instance of Expression.



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 17

def initialize args
  super
  @@evaluator ||= Puppet::Pops::Parser::EvaluatingParser.new()
end

Instance Method Details

#children ⇒ Object

The 3x requires code plugged in to an AST to have this in certain positions in the tree. The purpose is to either print the content, or to look for things that needs to be defined. This implementation cheats by always returning an empty array. (This allows simple files to not require a “Program” at the top.



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 54

def children
  []
end

#each {|_self| ... } ⇒ Object

Adapts to 3x where top level constructs needs to have each to iterate over children. Short circuit this by yielding self. By adding this there is no need to wrap a pops expression inside an AST::BlockExpression

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 34

def each
  yield self
end

#evaluate(scope) ⇒ Object 



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 26

def evaluate(scope)
  object = @@evaluator.evaluate(scope, @value)
  @@evaluator.convert_to_3x(object, scope)
end

#sequence_with(other) ⇒ Object 



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 38

def sequence_with(other)
  if value.nil?
    # This happens when testing and not having a complete setup
    other
  else
    # When does this happen ? Ever ?
    raise "sequence_with called on Puppet::Parser::AST::PopsBridge::Expression - please report use case"
    # What should be done if the above happens (We don't want this to happen).
    # Puppet::Parser::AST::BlockExpression.new(:children => [self] + other.children)
  end
end

#to_s ⇒ Object 



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 22

def to_s
  Puppet::Pops::Model::ModelTreeDumper.new.dump(@value)
end