Class: Puppet::Pops::Model::AstTransformer

Inherits:
Object
  • Object
show all
Defined in:
lib/puppet/pops/model/ast_transformer.rb

Overview

The receiver of ‘import(file)` calls; once per imported file, or nil if imports are ignored

Transforms a Pops::Model to classic Puppet AST. TODO: Documentation is currently skipped completely (it is only used for Rdoc)

Constant Summary collapse

AST = 
Puppet::Parser::AST
Model = 
Puppet::Pops::Model

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source_file = "unknown-file", importer = nil) ⇒ AstTransformer

Returns a new instance of AstTransformer.



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 16

def initialize(source_file = "unknown-file", importer = nil)
  @@transform_visitor ||= Puppet::Pops::Visitor.new(nil, "transform", 0, 0)
  @@query_transform_visitor ||= Puppet::Pops::Visitor.new(nil, "query", 0, 0)
  @@hostname_transform_visitor ||= Puppet::Pops::Visitor.new(nil, "hostname", 0, 0)
  @importer = importer
  @source_file = source_file
end

Instance Attribute Details

#importer ⇒ Object (readonly) 



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 14

def importer
  @importer
end

Instance Method Details

#ast(o, klass, hash = {}) ⇒ Object

Initialize klass from o (location) and hash (options to created instance). The object o is used to compute a source location. It may be nil. Source position is merged into the given options (non surgically). If o is non-nil, the first found source position going up the containment hierarchy is set. I.e. callers should pass nil if a source position is not wanted or known to be unobtainable for the object.

Parameters:

  • o (Object, nil) —

    object from which source position / location is obtained, may be nil

  • klass (Class<Puppet::Parser::AST>) —

    the ast class to create an instance of

  • hash (Hash) (defaults to: {}) —

    hash with options for the class to create



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 34

def ast(o, klass, hash = {})
  # create and pass hash with file and line information
  # PUP-3274 - still needed since hostname transformation requires AST::HostName, and AST::Regexp
  klass.new(**merge_location(hash, o))
end

#hostname(o) ⇒ Object

Transforms pops expressions into AST 3.1 hostnames



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 78

def hostname(o)
  @@hostname_transform_visitor.visit_this_0(self, o)
end

#hostname_Array(o) ⇒ Object

Transforms Array of host matching expressions into a (Ruby) array of AST::HostName



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 89

def hostname_Array(o)
  o.collect { |x| ast x, AST::HostName, :value => hostname(x) }
end

#hostname_LiteralDefault(o) ⇒ Object 



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 105

def hostname_LiteralDefault(o)
  'default'
end

#hostname_LiteralNumber(o) ⇒ Object 



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 101

def hostname_LiteralNumber(o)
  transform(o) # Number to string with correct radix
end

#hostname_LiteralRegularExpression(o) ⇒ Object 



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 109

def hostname_LiteralRegularExpression(o)
  ast o, AST::Regex, :value => o.value
end

#hostname_LiteralValue(o) ⇒ Object 



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 93

def hostname_LiteralValue(o)
  o.value
end

#hostname_Object(o) ⇒ Object 



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 113

def hostname_Object(o)
  raise _("Illegal expression - unacceptable as a node name")
end

#hostname_QualifiedName(o) ⇒ Object 



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 97

def hostname_QualifiedName(o)
  o.value
end

#is_nop?(o) ⇒ Boolean

Nil, nop Bee bopp a luh-lah, a bop bop boom.

Returns:

  • (Boolean) 


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# File 'lib/puppet/pops/model/ast_transformer.rb', line 124

def is_nop?(o)
  o.nil? || o.is_a?(Model::Nop)
end

#merge_location(hash, o) ⇒ Object

THIS IS AN EXPENSIVE OPERATION The 3x AST requires line, pos etc. to be recorded directly in the AST nodes and this information must be computed. (Newer implementation only computes the information that is actually needed; typically when raising an exception).



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 46

def merge_location(hash, o)
  if o
    pos = {}
    locator = o.locator
    offset = o.is_a?(Model::Program) ? 0 : o.offset
    pos[:line] = locator.line_for_offset(offset)
    pos[:pos]  = locator.pos_on_line(offset)
    pos[:file] = locator.file
    if nil_or_empty?(pos[:file]) && !nil_or_empty?(@source_file)
      pos[:file] = @source_file
    end
    hash = hash.merge(pos)
  end
  hash
end

#nil_or_empty?(x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/pops/model/ast_transformer.rb', line 128

def nil_or_empty?(x)
  x.nil? || x == ''
end

#query(o) ⇒ Object

Transforms pops expressions into AST 3.1 query expressions



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 73

def query(o)
  @@query_transform_visitor.visit_this_0(self, o)
end

#query_Object(o) ⇒ Object

Ensures transformation fails if a 3.1 non supported object is encountered in a query expression



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 84

def query_Object(o)
  raise _("Not a valid expression in a collection query: %{class_name}") % { class_name: o.class.name }
end

#transform(o) ⇒ Object

Transforms pops expressions into AST 3.1 statements/expressions



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 63

def transform(o)
  @@transform_visitor.visit_this_0(self, o)
rescue StandardError => e
  loc_data = {}
  merge_location(loc_data, o)
  raise Puppet::ParseError.new(_("Error while transforming to Puppet 3 AST: %{message}") % { message: e.message },
                               loc_data[:file], loc_data[:line], loc_data[:pos], e)
end

#transform_Object(o) ⇒ Object 



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# File 'lib/puppet/pops/model/ast_transformer.rb', line 117

def transform_Object(o)
  raise _("Unacceptable transform - found an Object without a rule: %{klass}") % { klass: o.class }
end