Class: Puppet::Parser::Scope

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Resource::TypeCollectionHelper, Util::Errors, Util::MethodHelper
Defined in:
lib/puppet/parser/scope.rb

Overview

This class is part of the internal parser/evaluator/compiler functionality of Puppet. It is passed between the various classes that participate in evaluation. None of its methods are API except those that are clearly marked as such.

Defined Under Namespace

Classes: Ephemeral, LocalScope, MatchScope

Constant Summary collapse

AST = 
Puppet::Parser::AST
RESERVED_VARIABLE_NAMES = 
['trusted', 'facts'].freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Util::Errors

#adderrorcontext, #devfail, #error_context, #exceptwrap, #fail

Methods included from Resource::TypeCollectionHelper

#known_resource_types

Methods included from Util::MethodHelper

#requiredopts, #set_options, #symbolize_options

Constructor Details

#initialize(compiler, options = {}) ⇒ Scope

Initialize our new scope. Defaults to having no parent.

Raises:



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# File 'lib/puppet/parser/scope.rb', line 262

def initialize(compiler, options = {})
  if compiler.is_a? Puppet::Parser::Compiler
    self.compiler = compiler
  else
    raise Puppet::DevError, "you must pass a compiler instance to a new scope object"
  end

  if n = options.delete(:namespace)
    @namespaces = [n]
  else
    @namespaces = [""]
  end

  raise Puppet::DevError, "compiler passed in options" if options.include? :compiler
  set_options(options)

  extend_with_functions_module

  # The symbol table for this scope.  This is where we store variables.
  #    @symtable = Ephemeral.new(nil, true)
  @symtable = LocalScope.new(nil)

  @ephemeral = [ MatchScope.new(@symtable, nil) ]

  # All of the defaults set for types.  It's a hash of hashes,
  # with the first key being the type, then the second key being
  # the parameter.
  @defaults = Hash.new { |dhash,type|
    dhash[type] = {}
  }

  # The table for storing class singletons.  This will only actually
  # be used by top scopes and node scopes.
  @class_scopes = {}

  @enable_immutable_data = Puppet[:immutable_node_data]
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 794

def method_missing(method, *args, &block)
  method.to_s =~ /^function_(.*)$/
  name = $1
  super unless name
  super unless Puppet::Parser::Functions.function(name)
  # In odd circumstances, this might not end up defined by the previous
  # method, so we might as well be certain.
  if respond_to? method
    send(method, *args)
  else
    raise Puppet::DevError, "Function #{name} not defined despite being loaded!"
  end
end

Instance Attribute Details

#compiler ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 29

def compiler
  @compiler
end

#namespaces ⇒ Object (readonly) 



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# File 'lib/puppet/parser/scope.rb', line 31

def namespaces
  @namespaces
end

#parent ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 30

def parent
  @parent
end

#resource ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 28

def resource
  @resource
end

#source ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 28

def source
  @source
end

Class Method Details

.number?(value) ⇒ Boolean

Coerce value to a number, or return nil if it isn’t one.

Returns:

  • (Boolean) 


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# File 'lib/puppet/parser/scope.rb', line 207

def self.number?(value)
  case value
  when Numeric
    value
  when /^-?\d+(:?\.\d+|(:?\.\d+)?e\d+)$/
    value.to_f
  when /^0x[0-9a-f]+$/i
    value.to_i(16)
  when /^0[0-7]+$/
    value.to_i(8)
  when /^-?\d+$/
    value.to_i
  else
    nil
  end
end

.true?(value) ⇒ Boolean

Is the value true? This allows us to control the definition of truth in one place.

Returns:

  • (Boolean) 


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# File 'lib/puppet/parser/scope.rb', line 195

def self.true?(value)
  case value
  when ''
    false
  when :undef
    false
  else
    !!value
  end
end

Instance Method Details

#[](varname, options = {}) ⇒ Object

Retrieves the variable value assigned to the name given as an argument. The name must be a String, and namespace can be qualified with ‘::’. The value is looked up in this scope, its parent scopes, or in a specific visible named scope.

Parameters:

  • varname (String) —

    the name of the variable (may be a qualified name using ‘(ns’::‘)*varname`

  • options (Hash) (defaults to: {}) —

    Additional options, not part of api.

Returns:

  • (Object) —

    the value assigned to the given varname

See Also:



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# File 'lib/puppet/parser/scope.rb', line 414

def [](varname, options={})
  lookupvar(varname, options)
end

#[]=(varname, value, options = {}) ⇒ Object

Sets the variable value of the name given as an argument to the given value. The value is set in the current scope and may shadow a variable with the same name in a visible outer scope. It is illegal to re-assign a variable in the same scope. It is illegal to set a variable in some other scope/namespace than the scope passed to a method.

Parameters:

  • varname (String) —

    The variable name to which the value is assigned. Must not contain ::

  • value (String) —

    The value to assign to the given variable name.

  • options (Hash) (defaults to: {}) —

    Additional options, not part of api.



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# File 'lib/puppet/parser/scope.rb', line 700

def []=(varname, value, options = {})
  setvar(varname, value, options = {})
end

#add_namespace(ns) ⇒ Object

Add to our list of namespaces.



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# File 'lib/puppet/parser/scope.rb', line 225

def add_namespace(ns)
  return false if @namespaces.include?(ns)
  if @namespaces == [""]
    @namespaces = [ns]
  else
    @namespaces << ns
  end
end

#bound?(name) ⇒ Boolean

Returns true if the given name is bound in the current (most nested) scope for assignments.

Returns:

  • (Boolean) 


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# File 'lib/puppet/parser/scope.rb', line 188

def bound?(name)
  # Do not look in ephemeral (match scope), the semantics is to answer if an assignable variable is bound
  effective_symtable(false).bound?(name)
end

#class_scope(klass) ⇒ Object

Return the scope associated with a class. This is just here so that subclasses can set their parent scopes to be the scope of their parent class, and it’s also used when looking up qualified variables.



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# File 'lib/puppet/parser/scope.rb', line 314

def class_scope(klass)
  # They might pass in either the class or class name
  k = klass.respond_to?(:name) ? klass.name : klass
  @class_scopes[k] || (parent && parent.class_scope(k))
end

#class_set(name, scope) ⇒ Object

Store the fact that we’ve evaluated a class, and store a reference to the scope in which it was evaluated, so that we can look it up later.



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# File 'lib/puppet/parser/scope.rb', line 302

def class_set(name, scope)
  if parent
    parent.class_set(name, scope)
  else
    @class_scopes[name] = scope
  end
end

#define_settings(type, params) ⇒ Object

Set defaults for a type. The typename should already be downcased, so that the syntax is isolated. We don’t do any kind of type-checking here; instead we let the resource do it when the defaults are used.



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# File 'lib/puppet/parser/scope.rb', line 587

def define_settings(type, params)
  table = @defaults[type]

  # if we got a single param, it'll be in its own array
  params = [params] unless params.is_a?(Array)

  params.each { |param|
    if table.include?(param.name)
      raise Puppet::ParseError.new("Default already defined for #{type} { #{param.name} }; cannot redefine", param.line, param.file)
    end
    table[param.name] = param
  }
end

#effective_symtable(use_ephemeral) ⇒ Object

Return the effective “table” for setting variables. This method returns the first ephemeral “table” that acts as a local scope, or this scope’s symtable. If the parameter use_ephemeral is true, the “top most” ephemeral “table” will be returned (irrespective of it being a match scope or a local scope).

Parameters:

  • use_ephemeral (Boolean) —

    whether the top most ephemeral (of any kind) should be used or not



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# File 'lib/puppet/parser/scope.rb', line 678

def effective_symtable use_ephemeral
  s = @ephemeral.last
  return s || @symtable if use_ephemeral

  # Why check if ephemeral is a Hash ??? Not needed, a hash cannot be a parent scope ???
  while s && !(s.is_a?(Hash) || s.is_local_scope?())
    s = s.parent
  end
  s ? s : @symtable
end

#enclosing_scope ⇒ Puppet::Parser::Scope

The enclosing scope (topscope or nodescope) of this scope. The enclosing scopes are produced when a class or define is included at some point. The parent scope of the included class or define becomes the scope in which it was included. The chain of parent scopes is followed until a node scope or the topscope is found

Returns:



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# File 'lib/puppet/parser/scope.rb', line 437

def enclosing_scope
  if has_enclosing_scope?
    if parent.is_topscope? or parent.is_nodescope?
      parent
    else
      parent.enclosing_scope
    end
  else
    nil
  end
end

#ephemeral_from(match, file = nil, line = nil) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 762

def ephemeral_from(match, file = nil, line = nil)
  case match
  when Hash
    # Create local scope ephemeral and set all values from hash
    new_ephemeral(true)
    match.each {|k,v| setvar(k, v, :file => file, :line => line, :ephemeral => true) }
    # Must always have an inner match data scope (that starts out as transparent)
    # In 3x slightly wasteful, since a new nested scope is created for a match 
    # (TODO: Fix that problem)
    new_ephemeral(false)
  else
    raise(ArgumentError,"Invalid regex match data. Got a #{match.class}") unless match.is_a?(MatchData)
    # Create a match ephemeral and set values from match data
    new_match_scope(match)
  end
end

#ephemeral_level ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 738

def ephemeral_level
  @ephemeral.size
end

#exist?(name) ⇒ Boolean

Returns true if the variable of the given name is set to any value (including nil)

Returns:

  • (Boolean) 


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# File 'lib/puppet/parser/scope.rb', line 181

def exist?(name)
  next_scope = inherited_scope || enclosing_scope
  effective_symtable(true).include?(name) || next_scope && next_scope.exist?(name)
end

#find_builtin_resource_type(type) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 785

def find_builtin_resource_type(type)
  Puppet::Type.type(type.to_s.downcase.to_sym)
end

#find_defined_resource_type(type) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 789

def find_defined_resource_type(type)
  known_resource_types.find_definition(namespaces, type.to_s.downcase)
end

#find_definition(name) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 238

def find_definition(name)
  known_resource_types.find_definition(namespaces, name)
end

#find_global_scope ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 242

def find_global_scope()
  # walk upwards until first found node_scope or top_scope
  if is_nodescope? || is_topscope?
    self
  else
    next_scope = inherited_scope || enclosing_scope
    if next_scope.nil?
      # this happens when testing, and there is only a single test scope and no link to any
      # other scopes
      self
    else
      next_scope.find_global_scope()
    end
  end
end

#find_hostclass(name, options = {}) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 234

def find_hostclass(name, options = {})
  known_resource_types.find_hostclass(namespaces, name, options)
end

#find_resource_type(type) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 779

def find_resource_type(type)
  # It still works fine without the type == 'class' short-cut, but it is a lot slower.
  return nil if ["class", "node"].include? type.to_s.downcase
  find_builtin_resource_type(type) || find_defined_resource_type(type)
end

#include?(name) ⇒ Boolean

Returns true if the variable of the given name has a non nil value. TODO: This has vague semantics - does the variable exist or not?

use ['name'] to get nil or value, and if nil check with exist?('name')
this include? is only useful because of checking against the boolean value false.

Returns:

  • (Boolean) 


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# File 'lib/puppet/parser/scope.rb', line 175

def include?(name)
  ! self[name].nil?
end

#inherited_scope ⇒ Puppet::Parser::Scope

The scope of the inherited thing of this scope’s resource. This could either be a node that was inherited or the class.

Returns:



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# File 'lib/puppet/parser/scope.rb', line 422

def inherited_scope
  if has_inherited_class?
    qualified_scope(resource.resource_type.parent)
  else
    nil
  end
end

#is_classscope? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/parser/scope.rb', line 449

def is_classscope?
  resource and resource.type == "Class"
end

#is_nodescope? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/parser/scope.rb', line 453

def is_nodescope?
  resource and resource.type == "Node"
end

#is_topscope? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/parser/scope.rb', line 457

def is_topscope?
  compiler and self == compiler.topscope
end

#lookup_as_local_name?(class_name, variable_name) ⇒ Boolean

Handles the special case of looking up fully qualified variable in not yet evaluated top scope This is ok if the lookup request originated in topscope (this happens when evaluating bindings; using the top scope to provide the values for facts.

Parameters:

  • class_name (String) —

    the classname part of a variable name, may be special “”

  • variable_name (String) —

    the variable name without the absolute leading ‘::’

Returns:

  • (Boolean) —

    true if the given variable name should be looked up directly in this scope



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# File 'lib/puppet/parser/scope.rb', line 491

def lookup_as_local_name?(class_name, variable_name)
  # not a local if name has more than one segment
  return nil if variable_name =~ /::/
  # partial only if the class for "" cannot be found
  return nil unless class_name == "" && klass = find_hostclass(class_name) && class_scope(klass).nil?
  is_topscope?
end

#lookup_qualified_variable(class_name, variable_name, position) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 461

def lookup_qualified_variable(class_name, variable_name, position)
  begin
    if lookup_as_local_name?(class_name, variable_name)
      self[variable_name]
    else
      qualified_scope(class_name).lookupvar(variable_name, position)
    end
  rescue RuntimeError => e
    unless Puppet[:strict_variables]
      # Do not issue warning if strict variables are on, as an error will be raised by variable_not_found
      location = if position[:lineproc]
                   " at #{position[:lineproc].call}"
                 elsif position[:file] && position[:line]
                   " at #{position[:file]}:#{position[:line]}"
                 else
                   ""
                 end
      warning "Could not look up qualified variable '#{class_name}::#{variable_name}'; #{e.message}#{location}"
    end
    variable_not_found("#{class_name}::#{variable_name}", e.message)
  end
end

#lookupdefaults(type) ⇒ Object

Collect all of the defaults set at any higher scopes. This is a different type of lookup because it’s additive – it collects all of the defaults, with defaults in closer scopes overriding those in later scopes.



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# File 'lib/puppet/parser/scope.rb', line 324

def lookupdefaults(type)
  values = {}

  # first collect the values from the parents
  if parent
    parent.lookupdefaults(type).each { |var,value|
      values[var] = value
    }
  end

  # then override them with any current values
  # this should probably be done differently
  if @defaults.include?(type)
    @defaults[type].each { |var,value|
      values[var] = value
    }
  end

  values
end

#lookuptype(name) ⇒ Object

Look up a defined type.



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# File 'lib/puppet/parser/scope.rb', line 346

def lookuptype(name)
  find_definition(name) || find_hostclass(name)
end

#lookupvar(name, options = {}) ⇒ Object

Lookup a variable within this scope using the Puppet language’s scoping rules. Variables can be qualified using just as in a manifest.

Parameters:

  • name (String) —

    the variable name to lookup

Returns:

  • Object the value of the variable, or nil if it’s not found



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# File 'lib/puppet/parser/scope.rb', line 367

def lookupvar(name, options = {})
  unless name.is_a? String
    raise Puppet::ParseError, "Scope variable name #{name.inspect} is a #{name.class}, not a string"
  end

  table = @ephemeral.last

  if name =~ /^(.*)::(.+)$/
    class_name = $1
    variable_name = $2
    lookup_qualified_variable(class_name, variable_name, options)

  # TODO: optimize with an assoc instead, this searches through scopes twice for a hit
  elsif table.include?(name)
    table[name]
  else
    next_scope = inherited_scope || enclosing_scope
    if next_scope
      next_scope.lookupvar(name, options)
    else
      variable_not_found(name)
    end
  end
end

#new_ephemeral(local_scope = false) ⇒ Object

TODO: Who calls this?



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# File 'lib/puppet/parser/scope.rb', line 743

def new_ephemeral(local_scope = false)
  if local_scope
    @ephemeral.push(LocalScope.new(@ephemeral.last))
  else
    @ephemeral.push(MatchScope.new(@ephemeral.last, nil))
  end
end

#new_match_scope(match_data) ⇒ Object

Nests a match data scope



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# File 'lib/puppet/parser/scope.rb', line 758

def new_match_scope(match_data)
  @ephemeral.push(MatchScope.new(@ephemeral.last, match_data))
end

#newscope(options = {}) ⇒ Object

Create a new scope and set these options.



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# File 'lib/puppet/parser/scope.rb', line 574

def newscope(options = {})
  compiler.newscope(self, options)
end

#parent_module_name ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 578

def parent_module_name
  return nil unless @parent
  return nil unless @parent.source
  @parent.source.module_name
end

#resolve_type_and_titles(type, titles) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/puppet/parser/scope.rb', line 808

def resolve_type_and_titles(type, titles)
  raise ArgumentError, "titles must be an array" unless titles.is_a?(Array)

  case type.downcase
  when "class"
    # resolve the titles
    titles = titles.collect do |a_title|
      hostclass = find_hostclass(a_title)
      hostclass ?  hostclass.name : a_title
    end
  when "node"
    # no-op
  else
    # resolve the type
    resource_type = find_resource_type(type)
    type = resource_type.name if resource_type
  end

  return [type, titles]
end

#set_facts(hash) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 645

def set_facts(hash)
  setvar('facts', deep_freeze(hash), :privileged => true)
end

#set_match_data(match_data) ⇒ Object

Sets match data in the most nested scope (which always is a MatchScope), it clobbers match data already set there



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# File 'lib/puppet/parser/scope.rb', line 753

def set_match_data(match_data)
  @ephemeral.last.match_data = match_data
end

#set_trusted(hash) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 641

def set_trusted(hash)
  setvar('trusted', deep_freeze(hash), :privileged => true)
end

#setvar(name, value, options = {}) ⇒ Object

Set a variable in the current scope. This will override settings in scopes above, but will not allow variables in the current scope to be reassigned.

It's preferred that you use self[]= instead of this; only use this

when you need to set options.



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# File 'lib/puppet/parser/scope.rb', line 608

def setvar(name, value, options = {})
  if name =~ /^[0-9]+$/
    raise Puppet::ParseError.new("Cannot assign to a numeric match result variable '$#{name}'") # unless options[:ephemeral]
  end
  unless name.is_a? String
    raise Puppet::ParseError, "Scope variable name #{name.inspect} is a #{name.class}, not a string"
  end

  # Check for reserved variable names
  if @enable_immutable_data && !options[:privileged] && RESERVED_VARIABLE_NAMES.include?(name)
    raise Puppet::ParseError, "Attempt to assign to a reserved variable name: '#{name}'"
  end

  table = effective_symtable options[:ephemeral]
  if table.bound?(name)
    if options[:append]
      error = Puppet::ParseError.new("Cannot append, variable #{name} is defined in this scope")
    else
      error = Puppet::ParseError.new("Cannot reassign variable #{name}")
    end
    error.file = options[:file] if options[:file]
    error.line = options[:line] if options[:line]
    raise error
  end

  if options[:append]
    table[name] = append_value(undef_as('', self[name]), value)
  else
    table[name] = value
  end
  table[name]
end

#to_hash(recursive = true) ⇒ Object

Returns a Hash containing all variables and their values, optionally (and by default) including the values defined in parent. Local values shadow parent values. Ephemeral scopes for match results ($0 - $n) are not included.

This is currently a wrapper for to_hash_legacy or to_hash_future.

See Also:



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# File 'lib/puppet/parser/scope.rb', line 525

def to_hash(recursive = true)
  @parser ||= Puppet[:parser]
  if @parser == 'future'
    to_hash_future(recursive)
  else
    to_hash_legacy(recursive)
  end
end

#to_hash_future(recursive) ⇒ Object

Fixed version of to_hash that implements scoping correctly (i.e., with dynamic scoping disabled #28200 / PUP-1220

See Also:



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# File 'lib/puppet/parser/scope.rb', line 538

def to_hash_future(recursive)
  if recursive and has_enclosing_scope?
    target = enclosing_scope.to_hash_future(recursive)
    if !(inherited = inherited_scope).nil?
      target.merge!(inherited.to_hash_future(recursive))
    end
  else
    target = Hash.new
  end

  # add all local scopes
  @ephemeral.last.add_entries_to(target)
  target
end

#to_hash_legacy(recursive = true) ⇒ Object

The old broken implementation of to_hash that retains the dynamic scoping semantics

See Also:



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# File 'lib/puppet/parser/scope.rb', line 557

def to_hash_legacy(recursive = true)
  if recursive and parent
    target = parent.to_hash_legacy(recursive)
  else
    target = Hash.new
  end

  # add all local scopes
  @ephemeral.last.add_entries_to(target)
  target
end

#to_s ⇒ Object

Used mainly for logging



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# File 'lib/puppet/parser/scope.rb', line 723

def to_s
  "Scope(#{@resource})"
end

#undef_as(x, v) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 350

def undef_as(x,v)
  if v.nil? or v == :undef
    x
  else
    v
  end
end

#unset_ephemeral_var(level = :all) ⇒ Object

remove ephemeral scope up to level TODO: Who uses :all ? Remove ??



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# File 'lib/puppet/parser/scope.rb', line 730

def unset_ephemeral_var(level=:all)
  if level == :all
    @ephemeral = [ MatchScope.new(@symtable, nil)]
  else
    @ephemeral.pop(@ephemeral.size - level)
  end
end

#variable_not_found(name, reason = nil) ⇒ Object 



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# File 'lib/puppet/parser/scope.rb', line 392

def variable_not_found(name, reason=nil)
  if Puppet[:strict_variables]
    if Puppet[:evaluator] == 'future' && Puppet[:parser] == 'future'
      throw :undefined_variable
    else
      reason_msg = reason.nil? ? '' : "; #{reason}"
      raise Puppet::ParseError, "Undefined variable #{name.inspect}#{reason_msg}"
    end
  else
    nil
  end
end