Class: Puppet::Parser::AST::PopsBridge::Program

Inherits:
TopLevelConstruct show all
Defined in:
lib/puppet/parser/ast/pops_bridge.rb

Overview

Bridges the top level “Program” produced by the pops parser. Its main purpose is to give one point where all definitions are instantiated (actually defined since the Puppet 3x terminology is somewhat misleading - the definitions are instantiated, but instances of the created types are not created, that happens when classes are included / required, nodes are matched and when resources are instantiated by a resource expression (which is also used to instantiate a host class).

Constant Summary

Constants inherited from Puppet::Parser::AST

AST

Instance Attribute Summary collapse

Attributes inherited from Puppet::Parser::AST

#file, #line, #parent, #pos, #scope

Instance Method Summary collapse

Methods inherited from Puppet::Parser::AST

#inspect, #safeevaluate

Methods included from Util::Errors

#adderrorcontext, #devfail, #error_context, error_location, error_location_with_space, error_location_with_unknowns, #exceptwrap, #fail

Constructor Details

#initialize(program_model, context = {}) ⇒ Program

Returns a new instance of Program.



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 79

def initialize(program_model, context = {})
  @program_model = program_model
  @context = context
  @ast_transformer ||= Puppet::Pops::Model::AstTransformer.new(@context[:file])
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 77

def context
  @context
end

#program_model ⇒ Object (readonly)

Returns the value of attribute program_model.



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 77

def program_model
  @program_model
end

Instance Method Details

#each {|_self| ... } ⇒ Object

Adapts to 3x where top level constructs needs to have each to iterate over children. Short circuit this by yielding self. This means that the HostClass container will call this bridge instance with ‘instantiate`.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 116

def each
  yield self
end

#evaluate(scope) ⇒ Object 



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 109

def evaluate(scope)
  Puppet::Pops::Parser::EvaluatingParser.singleton.evaluate(scope, program_model)
end

#instantiate(modname) ⇒ Object

This is the 3x API, the 3x AST searches through all code to find the instructions that can be instantiated. This Pops-model based instantiation relies on the parser to build this list while parsing (which is more efficient as it avoids one full scan of all logic via recursive enumeration/yield)



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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 89

def instantiate(modname)
  @program_model.definitions.map do |d|
    case d
    when Puppet::Pops::Model::HostClassDefinition
      instantiate_HostClassDefinition(d, modname)
    when Puppet::Pops::Model::ResourceTypeDefinition
      instantiate_ResourceTypeDefinition(d, modname)
    when Puppet::Pops::Model::NodeDefinition
      instantiate_NodeDefinition(d, modname)
    else
      loaders = Puppet::Pops::Loaders.loaders
      loaders.instantiate_definition(d, loaders.find_loader(modname))

      # The 3x logic calling this will not know what to do with the result, it is compacted away at the end
      nil
    end
  end.flatten().compact() # flatten since node definition may have returned an array
  # Compact since 4x definitions are not understood by compiler
end

#is_definitions_only? ⇒ Boolean

Returns true if this Program only contains definitions

Returns:

  • (Boolean) 


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# File 'lib/puppet/parser/ast/pops_bridge.rb', line 121

def is_definitions_only?
  is_definition?(program_model)
end