diff --git a/lib/puppet/pops/evaluator/access_operator.rb b/lib/puppet/pops/evaluator/access_operator.rb index c511ef9e4..b3a490163 100644 --- a/lib/puppet/pops/evaluator/access_operator.rb +++ b/lib/puppet/pops/evaluator/access_operator.rb @@ -1,236 +1,236 @@ # AccessOperator handles operator [] # This operator is part of evaluation. # class Puppet::Pops::Evaluator::AccessOperator # Provides access to the Puppet 3.x runtime (scope, etc.) # This separation has been made to make it easier to later migrate the evaluator to an improved runtime. # include Puppet::Pops::Evaluator::Runtime3Support Issues = Puppet::Pops::Issues attr_reader :semantic # Initialize with AccessExpression to enable reporting issues # @param access_expression [Puppet::Pops::Model::AccessExpression] the semantic object being evaluated # @return [void] # def initialize(access_expression) @@access_visitor ||= Puppet::Pops::Visitor.new(self, "access", 2, nil) @semantic = access_expression end def access (o, scope, *keys) @@access_visitor.visit_this_2(self, o, scope, keys) end protected def access_Object(o, scope, keys) fail("The [] operator is not applicable to the result of the LHS expression: #{o.class}", semantic.left_expr, scope) end def access_String(o, scope, keys) case keys.size when 0 fail(Puppet::Pops::Issues::BAD_STRING_SLICE_ARITY, @semantic.left_expr, {:actual => keys.size}) when 1 - o[box_numeric(keys[0], @semantic.keys, scope)] + o[coerce_numeric(keys[0], @semantic.keys, scope)] when 2 - o[box_numeric(keys[0], @semantic.keys, scope), box_numeric(keys[1], @semantic.keys, scope)] + o[coerce_numeric(keys[0], @semantic.keys, scope), coerce_numeric(keys[1], @semantic.keys, scope)] else fail(Puppet::Pops::Issues::BAD_STRING_SLICE_ARITY, @semantic.left_expr, {:actual => keys.size}) end end # Speciaizes the Pattern p into itself p[], one regexp instance p[], or array of regexp instances # p[, ]. # def access_PPatternType(o, scope, keys) if keys.size == 0 return Marshal.load(Marshal.dump(o)) end result = keys.collect {|p| Regexp.new(keys[0]) } result.size == 1 ? result.pop : result end # Evaluates [] with 1 or 2 arguments. One argument is an index lookup, two arguments is a slice from/to. # def access_Array(o, scope, keys) case keys.size when 0 # What does this mean: [] ? Is it error, unit, empty array fail(Puppet::Pops::Issues::BAD_ARRAY_SLICE_ARITY, @semantic.left_expr, {:actual => keys.size}) when 1 - k = box_numeric(keys[0], @semantic.keys[0], scope) + k = coerce_numeric(keys[0], @semantic.keys[0], scope) o[k] when 2 # A slice [from, to] with support for -1 to mean start, or end respectively. - k1 = box_numeric(keys[0], @semantic.keys[0], scope) - k2 = box_numeric(keys[1], @semantic.keys[1], scope) + k1 = coerce_numeric(keys[0], @semantic.keys[0], scope) + k2 = coerce_numeric(keys[1], @semantic.keys[1], scope) o[k1, k2] else fail(Puppet::Pops::Issues::BAD_ARRAY_SLICE_ARITY, @semantic.left_expr, {:actual => keys.size}) end end # Evaluates [] with support for one or more arguments. If more than one argument is used, the result # is an array with each lookup. # def access_Hash(o, scope, keys) result = keys.collect {|k| o[k] } case result.size when 0 fail(Puppet::Pops::Issues::BAD_HASH_SLICE_ARITY, @semantic.left_expr, {:actual => keys.size}) when 1 result.pop else # remove nil elements and return result.compact! result end end def access_PIntegerType(o, scope, keys) unless keys.size.between?(1, 2) fail(Puppet::Pops::Issues::BAD_INTEGER_SLICE_ARITY, @semantic, {:actual => keys.size}) end keys.each_with_index do |x, index| fail(Puppet::Pops::Issues::BAD_INTEGER_SLICE_TYPE, @semantic.keys[index], {:actual => x.class}) unless (x.is_a?(Numeric) || x == :default) end ranged_integer = Puppet::Pops::Types::PIntegerType.new() from, to = keys ranged_integer.from = from == :default ? nil : from ranged_integer.to = to == :default ? nil : to ranged_integer end # A Hash can create a new Hash type, one arg sets value type, two args sets key and value type in new type # It is not possible to create a collection of Hash types. # def access_PHashType(o, scope, keys) keys.each_with_index do |k, index| unless k.is_a?(Puppet::Pops::Types::PAbstractType) fail(Puppet::Pops::Issues::BAD_TYPE_SLICE_TYPE, @semantic.keys[index], {:base_type => 'Hash', :actual => k.class}) end end case keys.size when 1 result = Puppet::Pops::Types::PHashType.new() result.key_type = Marshal.load(Marshal.dump(o.key_type)) result.element_type = keys[0] result when 2 result = Puppet::Pops::Types::PHashType.new() result.key_type = keys[0] result.element_type = keys[1] result else fail(Puppet::Pops::Issues::BAD_TYPE_SLICE_ARITY, @semantic, {:base_type => 'Hash', :min => 1, :max => 2, :actual => keys.size}) end end # An Array can create a new Array type. It is not possible to create a collection of Array types. # def access_PArrayType(o, scope, keys) if keys.size == 1 unless keys[0].is_a?(Puppet::Pops::Types::PAbstractType) fail(Puppet::Pops::Issues::BAD_TYPE_SLICE_TYPE, @semantic.keys[0], {:base_type => 'Array', :actual => keys[0].class}) end result = Puppet::Pops::Types::PArrayType.new() result.element_type = keys[0] result else fail(Puppet::Pops::Issues::BAD_TYPE_SLICE_ARITY, @semantic, {:base_type => 'Array', :min => 1, :actual => keys.size}) end end # A Resource can create a new more specific Resource type, and/or an array of resource types # If the given type has title set, it can not be specified further. # @example # Resource[File] # => File # Resource[File, 'foo'] # => File[foo] # Resource[File. 'foo', 'bar] # => [File[foo], File[bar]] # File['foo', 'bar'] # => [File[foo], File[bar]] # File['foo']['bar'] # => ERROR # Resource[File]['foo', 'bar'] # => [File[Foo], File[bar]] # Resource[File, 'foo', 'bar'] # => [File[foo], File[bar]] # Resource[???][] # => deep copy of the type # def access_PResourceType(o, scope, keys) if keys.size == 0 fail(Puppet::Pops::Issues::BAD_TYPE_SLICE_ARITY, o, :base_type => Puppet::Pops::Types::TypeCalculator.new().string(o), :min => 1, :actual => 0) end if !o.title.nil? # lookup resource and return one or more parameter values resource = find_resource(scope, o.type_name, o.title) unless resource fail(Puppet::Pops::Issues::UNKNOWN_RESOURCE, @semantic, {:type_name => o.type_name, :title => o.title}) end result = keys.map do |k| unless is_parameter_of_resource?(scope, resource, k) fail(Puppet::Pops::Issues::UNKNOWN_RESOURCE_PARAMETER, @semantic, {:type_name => o.type_name, :title => o.title, :param_name=>k}) end get_resource_parameter_value(scope, resource, k) end return result.size <= 1 ? result.pop : result end # type_name is LHS type_name if set, else the first given arg type_name = o.type_name || keys.shift type_name = case type_name when Puppet::Pops::Types::PResourceType type_name.type_name when String type_name.downcase else fail(Puppet::Pops::Issues::ILLEGAL_RESOURCE_SPECIALIZATION, @semantic.keys, {:actual => type_name.class}) end keys = [nil] if keys.size < 1 # if there was only a type_name and it was consumed result = keys.collect do |t| rtype = Puppet::Pops::Types::PResourceType.new() rtype.type_name = type_name rtype.title = t rtype end # returns single type as type, else an array of types result.size == 1 ? result.pop : result end def access_PHostClassType(o, scope, keys) if keys.size == 0 fail(Puppet::Pops::Issues::BAD_TYPE_SLICE_ARITY, o, :base_type => Puppet::Pops::Types::TypeCalculator.new().string(o), :min => 1, :actual => 0) end if ! o.class_name.nil? # lookup class resource and return one or more parameter values resource = find_resource(scope, 'class', o.class_name) unless resource fail(Puppet::Pops::Issues::UNKNOWN_RESOURCE, @semantic, {:type_name => 'Class', :title => o.class_name}) end result = keys.map do |k| unless is_parameter_of_resource?(scope, resource, k) fail(Puppet::Pops::Issues::UNKNOWN_RESOURCE_PARAMETER, @semantic, {:type_name => 'Class', :title => o.class_name, :param_name=>k}) end get_resource_parameter_value(scope, resource, k) end return result.size <= 1 ? result.pop : result # TODO: if [] is applied to specific class, it should be treated the same as getting # a resource parameter. Now it fails the operation # fail(Puppet::Pops::Issues::ILLEGAL_TYPE_SPECIALIZATION, semantic.left_expr, {:kind => 'Class'}) end result = keys.collect do |c| ctype = Puppet::Pops::Types::PHostClassType.new() ctype.class_name = c ctype end # returns single type as type, else an array of types result.size == 1 ? result.pop : result end end diff --git a/lib/puppet/pops/evaluator/evaluator_impl.rb b/lib/puppet/pops/evaluator/evaluator_impl.rb index fa251eb65..15760dae8 100644 --- a/lib/puppet/pops/evaluator/evaluator_impl.rb +++ b/lib/puppet/pops/evaluator/evaluator_impl.rb @@ -1,943 +1,943 @@ require 'rgen/ecore/ecore' require 'puppet/pops/evaluator/compare_operator' require 'puppet/pops/evaluator/relationship_operator' require 'puppet/pops/evaluator/access_operator' require 'puppet/pops/evaluator/closure' # This implementation of {Puppet::Pops::Evaluator} performs evaluation using the puppet 3.x runtime system # in a manner largely compatible with Puppet 3.x, but adds new features and introduces constraints. # # The evaluation uses _polymorphic dispatch_ which works by dispatching to the first found method named after # the class or one of its super-classes. The EvaluatorImpl itself mainly deals with evaluation (it currently # also handles assignment), and it uses a delegation pattern to more specialized handlers of some operators # that in turn use polymorphic dispatch; this to not clutter EvaluatorImpl with too much responsibility). # # Since a pattern is used, only the main entry points are fully documented. The parameters _o_ and _scope_ are # the same in all the polymorphic methods, (the type of the parameter _o_ is reflected in the method's name; # either the actual class, or one of its super classes). The _scope_ parameter is always the scope in which # the evaluation takes place. If nothing else is mentioned, the return is always the result of evaluation. # # See {Puppet::Pops::Visitable} and {Puppet::Pops::Visitor} for more information about # polymorphic calling. # class Puppet::Pops::Evaluator::EvaluatorImpl include Puppet::Pops::Utils # Provides access to the Puppet 3.x runtime (scope, etc.) # This separation has been made to make it easier to later migrate the evaluator to an improved runtime. # include Puppet::Pops::Evaluator::Runtime3Support # Reference to Issues name space makes it easier to refer to issues # (Issues are shared with the validator). # Issues = Puppet::Pops::Issues def initialize @@eval_visitor ||= Puppet::Pops::Visitor.new(self, "eval", 1, 1) @@lvalue_visitor ||= Puppet::Pops::Visitor.new(self, "lvalue", 1, 1) @@assign_visitor ||= Puppet::Pops::Visitor.new(self, "assign", 3, 3) @@string_visitor ||= Puppet::Pops::Visitor.new(self, "string", 1, 1) @@type_calculator ||= Puppet::Pops::Types::TypeCalculator.new() @@type_parser ||= Puppet::Pops::Types::TypeParser.new() @@compare_operator ||= Puppet::Pops::Evaluator::CompareOperator.new() @@relationship_operator ||= Puppet::Pops::Evaluator::RelationshipOperator.new() end # @api private def type_calculator @@type_calculator end # Polymorphic evaluate - calls eval_TYPE # # ## Polymorphic evaluate # Polymorphic evaluate calls a method on the format eval_TYPE where classname is the last # part of the class of the given _target_. A search is performed starting with the actual class, continuing # with each of the _target_ class's super classes until a matching method is found. # # # Description # Evaluates the given _target_ object in the given scope, optionally passing a block which will be # called with the result of the evaluation. # # @overload evaluate(target, scope, {|result| block}) # @param target [Object] evaluation target - see methods on the pattern assign_TYPE for actual supported types. # @param scope [Object] the runtime specific scope class where evaluation should take place # @return [Object] the result of the evaluation # # @api # def evaluate(target, scope) @@eval_visitor.visit_this_1(self, target, scope) end # Polymorphic assign - calls assign_TYPE # # ## Polymorphic assign # Polymorphic assign calls a method on the format assign_TYPE where TYPE is the last # part of the class of the given _target_. A search is performed starting with the actual class, continuing # with each of the _target_ class's super classes until a matching method is found. # # # Description # Assigns the given _value_ to the given _target_. The additional argument _o_ is the instruction that # produced the target/value tuple and it is used to set the origin of the result. # @param target [Object] assignment target - see methods on the pattern assign_TYPE for actual supported types. # @param value [Object] the value to assign to `target` # @param o [Puppet::Pops::Model::PopsObject] originating instruction # @param scope [Object] the runtime specific scope where evaluation should take place # # @api # def assign(target, value, o, scope) @@assign_visitor.visit_this_3(self, target, value, o, scope) end def lvalue(o, scope) @@lvalue_visitor.visit_this_1(self, o, scope) end def string(o, scope) @@string_visitor.visit_this_1(self, o, scope) end # Call a closure - Can only be called with a Closure (for now), may be refactored later # to also handle other types of calls (function calls are also handled by CallNamedFunction and CallMethod, they # could create similar objects to Closure, wait until other types of defines are instantiated - they may behave # as special cases of calls - i.e. 'new') # # @raise ArgumentError, if there are to many or too few arguments # @raise ArgumentError, if given closure is not a Puppet::Pops::Evaluator::Closure # def call(closure, args, scope) raise ArgumentError, "Can only call a Lambda" unless closure.is_a?(Puppet::Pops::Evaluator::Closure) pblock = closure.model parameters = pblock.parameters || [] raise ArgumentError, "Too many arguments: #{args.size} for #{parameters.size}" unless args.size <= parameters.size # associate values with parameters merged = parameters.zip(args) # calculate missing arguments missing = parameters.slice(args.size, parameters.size - args.size).select {|p| p.value.nil? } unless missing.empty? optional = parameters.count { |p| !p.value.nil? } raise ArgumentError, "Too few arguments; #{args.size} for #{optional > 0 ? ' min ' : ''}#{parameters.size - optional}" end evaluated = merged.collect do |m| # m can be one of # m = [Parameter{name => "name", value => nil], "given"] # | [Parameter{name => "name", value => Expression}, "given"] # # "given" is always an optional entry. If a parameter was provided then # the entry will be in the array, otherwise the m array will be a # single element.a = [] given_argument = m[1] argument_name = m[0].name default_expression = m[0].value value = if default_expression evaluate(default_expression, scope) else given_argument end [argument_name, value] end # Store the evaluated name => value associations in a new inner/local/ephemeral scope # (This is made complicated due to the fact that the implementation of scope is overloaded with # functionality and an inner ephemeral scope must be used (as opposed to just pushing a local scope # on a scope "stack"). # Ensure variable exists with nil value if error occurs. # Some ruby implementations does not like creating variable on return result = nil begin scope_memo = get_scope_nesting_level(scope) # change to create local scope_from - cannot give it file and line - that is the place of the call, not # "here" create_local_scope_from(Hash[evaluated], scope) result = evaluate(pblock.body, scope) ensure set_scope_nesting_level(scope, scope_memo) end result end protected def lvalue_VariableExpression(o, scope) # evaluate the name evaluate(o.expr, scope) end # Catches all illegal lvalues # def lvalue_Object(o, scope) fail(Issues::ILLEGAL_ASSIGNMENT, o) end # Assign value to named variable. # The '$' sign is never part of the name. # @example In Puppet DSL # $name = value # @param name [String] name of variable without $ # @param value [Object] value to assign to the variable # @param o [Puppet::Pops::Model::PopsObject] originating instruction # @param scope [Object] the runtime specific scope where evaluation should take place # @return [value] # def assign_String(name, value, o, scope) if name =~ /::/ fail(Issues::CROSS_SCOPE_ASSIGNMENT, o.left_expr, {:name => name}) end set_variable(name, value, o, scope) value end def assign_Numeric(n, value, o, scope) fail(Issues::ILLEGAL_NUMERIC_ASSIGNMENT, o.left_expr, {:varname => n.to_s}) end # Catches all illegal assignment (e.g. 1 = 2, {'a'=>1} = 2, etc) # def assign_Object(name, value, o, scope) fail(Issues::ILLEGAL_ASSIGNMENT, o) end def eval_Factory(o, scope) evaluate(o.current, scope) end # Evaluates any object not evaluated to something else to itself. def eval_Object o, scope o end # Allows nil to be used as a Nop. # Evaluates to nil # TODO: What is the difference between literal undef, nil, and nop? # def eval_NilClass(o, scope) nil end # Evaluates Nop to nil. # TODO: or is this the same as :undef # TODO: is this even needed as a separate instruction when there is a literal undef? def eval_Nop(o, scope) nil end # Captures all LiteralValues not handled elsewhere. # def eval_LiteralValue(o, scope) o.value end def eval_LiteralDefault(o, scope) :default end def eval_LiteralUndef(o, scope) :undef # TODO: or just use nil for this? end # A QualifiedReference (i.e. a capitalized qualified name such as Foo, or Foo::Bar) evaluates to a PType # def eval_QualifiedReference(o, scope) @@type_parser.interpret(o) end def eval_NotExpression(o, scope) ! is_true?(evaluate(o.expr, scope)) end def eval_UnaryMinusExpression(o, scope) - - box_numeric(evaluate(o.expr, scope), o, scope) + - coerce_numeric(evaluate(o.expr, scope), o, scope) end # Abstract evaluation, returns array [left, right] with the evaluated result of left_expr and # right_expr # @return > array with result of evaluating left and right expressions # def eval_BinaryExpression o, scope [ evaluate(o.left_expr, scope), evaluate(o.right_expr, scope) ] end # Evaluates assignment with operators =, +=, -= and # # @example Puppet DSL # $a = 1 # $a += 1 # $a -= 1 # def eval_AssignmentExpression(o, scope) name = lvalue(o.left_expr, scope) value = evaluate(o.right_expr, scope) case o.operator when :'=' # regular assignment assign(name, value, o, scope) when :'+=' # if value does not exist, return RHS (note that type check has already been made so correct type is ensured) if !variable_exists?(name, scope) return value end begin # Delegate to calculate function to deal with check of LHS, and perform ´+´ as arithmetic or concatenation the # same way as ArithmeticExpression performs `+`. assign(name, calculate(get_variable_value(name, o, scope), value, :'+', o.left_expr, o.right_expr, scope), o, scope) rescue ArgumentError => e fail(Issues::APPEND_FAILED, o, {:message => e.message}) end when :'-=' # If an attempt is made to delete values from something that does not exists, the value is :undef (it is guaranteed to not # include any values the user wants deleted anyway :-) # if !variable_exists?(name, scope) return nil end begin # Delegate to delete function to deal with check of LHS, and perform deletion assign(name, delete(get_variable_value(name, o, scope), value), o, scope) rescue ArgumentError => e fail(Issues::APPEND_FAILED, o, {:message => e.message}) end else fail(Issues::UNSUPPORTED_OPERATOR, o, {:operator => o.operator}) end value end ARITHMETIC_OPERATORS = [:'+', :'-', :'*', :'/', :'%', :'<<', :'>>'] COLLECTION_OPERATORS = [:'+', :'-', :'<<'] # Handles binary expression where lhs and rhs are array/hash or numeric and operator is +, - , *, % / << >> # def eval_ArithmeticExpression(o, scope) unless ARITHMETIC_OPERATORS.include?(o.operator) fail(Issues::UNSUPPORTED_OPERATOR, o, {:operator => o.operator}) end left, right = eval_BinaryExpression(o, scope) begin result = calculate(left, right, o.operator, o.left_expr, o.right_expr, scope) rescue ArgumentError => e fail(Issues::RUNTIME_ERROR, o, {:detail => e.message}, e) end result end # Handles binary expression where lhs and rhs are array/hash or numeric and operator is +, - , *, % / << >> # def calculate(left, right, operator, left_o, right_o, scope) unless ARITHMETIC_OPERATORS.include?(operator) fail(Issues::UNSUPPORTED_OPERATOR, left_o.eContainer, {:operator => o.operator}) end if (left.is_a?(Array) || left.is_a?(Hash)) && COLLECTION_OPERATORS.include?(operator) # Handle operation on collections case operator when :'+' concatenate(left, right) when :'-' delete(left, right) when :'<<' unless left.is_a?(Array) fail(Issues::OPERATOR_NOT_APPLICABLE, left_o, {:operator => operator, :left_value => left}) end left + [right] end else # Handle operation on numeric - left = box_numeric(left, left_o, scope) - right = box_numeric(right, right_o, scope) + left = coerce_numeric(left, left_o, scope) + right = coerce_numeric(right, right_o, scope) begin if operator == :'%' && (left.is_a?(Float) || right.is_a?(Float)) # Deny users the fun of seeing severe rounding errors and confusing results fail(Issues::OPERATOR_NOT_APPLICABLE, left_o, {:operator => operator, :left_value => left}) end result = left.send(operator, right) rescue NoMethodError => e fail(Issues::OPERATOR_NOT_APPLICABLE, left_o, {:operator => operator, :left_value => left}) end result end end # Evaluates Puppet DSL ->, ~>, <-, and <~ def eval_RelationshipExpression(o, scope) # First level evaluation, reduction to basic data types or puppet types, the relationship operator then translates this # to the final set of references (turning strings into references, which can not naturally be done by the main evaluator since # all strings should not be turned into references. # real = eval_BinaryExpression(o, scope) @@relationship_operator.evaluate(real, o, scope) end # Evaluates x[key, key, ...] # def eval_AccessExpression(o, scope) left = evaluate(o.left_expr, scope) keys = o.keys.nil? ? [] : o.keys.collect {|key| evaluate(key, scope) } Puppet::Pops::Evaluator::AccessOperator.new(o).access(left, scope, *keys) end # Evaluates <, <=, >, >=, and == # def eval_ComparisonExpression o, scope left, right = eval_BinaryExpression o, scope begin # Left is a type if left.is_a?(Puppet::Pops::Types::PAbstractType) case o.operator when :'==' @@compare_operator.equals(left,right) when :'!=' ! @@compare_operator.equals(left,right) when :'<' # left can be assigned to right, but they are not equal @@type_calculator.assignable?(right, left) && ! @@compare_operator.equals(left,right) when :'<=' # left can be assigned to right @@type_calculator.assignable?(right, left) when :'>' # right can be assigned to left, but they are not equal @@type_calculator.assignable?(left,right) && ! @@compare_operator.equals(left,right) when :'>=' # right can be assigned to left @@type_calculator.assignable?(left, right) else fail(Issues::UNSUPPORTED_OPERATOR, o, {:operator => o.operator}) end else case o.operator when :'==' @@compare_operator.equals(left,right) when :'!=' ! @@compare_operator.equals(left,right) when :'<' @@compare_operator.compare(left,right) < 0 when :'<=' @@compare_operator.compare(left,right) <= 0 when :'>' @@compare_operator.compare(left,right) > 0 when :'>=' @@compare_operator.compare(left,right) >= 0 else fail(Issues::UNSUPPORTED_OPERATOR, o, {:operator => o.operator}) end end rescue ArgumentError => e fail(Issues::COMPARISON_NOT_POSSIBLE, o, { :operator => o.operator, :left_value => left, :right_value => right, :detail => e.message}) end end # Evaluates matching expressions with type, string or regexp rhs expression. # If RHS is a type, the =~ matches compatible (assignable?) type. # # @example # x =~ /abc.*/ # @example # x =~ "abc.*/" # @example # y = "abc" # x =~ "${y}.*" # @example # [1,2,3] =~ Array[Integer[1,10]] # @return [Boolean] if a match was made or not. Also sets $0..$n to matchdata in current scope. # def eval_MatchExpression o, scope left, pattern = eval_BinaryExpression o, scope if pattern.is_a?(Puppet::Pops::Types::PAbstractType) matched = @@type_calculator.instance?(pattern, left) else begin pattern = Regexp.new(pattern) unless pattern.is_a?(Regexp) rescue StandardError => e fail(Issues::MATCH_NOT_REGEXP, o.right_expr, {:detail => e.message}) end unless left.is_a?(String) fail(Issues::MATCH_NOT_STRING, o.left_expr, {:left_value => left}) end matched = pattern.match(left) # nil, or MatchData set_match_data(matched, o, scope) # creates ephemeral end # convert match result to Boolean true, or false o.operator == :'=~' ? !!matched : !matched end # Evaluates Puppet DSL `in` expression # def eval_InExpression o, scope left, right = eval_BinaryExpression o, scope @@compare_operator.include?(right, left) end # @example # $a and $b # b is only evaluated if a is true # def eval_AndExpression o, scope is_true?(evaluate(o.left_expr, scope)) ? is_true?(evaluate(o.right_expr, scope)) : false end # @example # a or b # b is only evaluated if a is false # def eval_OrExpression o, scope is_true?(evaluate(o.left_expr, scope)) ? true : is_true?(evaluate(o.right_expr, scope)) end # Evaluates each entry of the literal list and creates a new Array # @return [Array] with the evaluated content # def eval_LiteralList o, scope o.values.collect {|expr| evaluate(expr, scope)} end # Evaluates each entry of the literal hash and creates a new Hash. # @return [Hash] with the evaluated content # def eval_LiteralHash o, scope h = Hash.new o.entries.each {|entry| h[ evaluate(entry.key, scope)]= evaluate(entry.value, scope)} h end # Evaluates all statements and produces the last evaluated value # def eval_BlockExpression o, scope r = nil o.statements.each {|s| r = evaluate(s, scope)} r end # Performs optimized search over case option values, lazily evaluating each # until there is a match. If no match is found, the case expression's default expression # is evaluated (it may be nil or Nop if there is no default, thus producing nil). # If an option matches, the result of evaluating that option is returned. # @return [Object, nil] what a matched option returns, or nil if nothing matched. # def eval_CaseExpression(o, scope) # memo scope level before evaluating test - don't want a match in the case test to leak $n match vars # to expressions after the case expression. # with_guarded_scope(scope) do test = evaluate(o.test, scope) result = nil the_default = nil if o.options.find do |co| # the first case option that matches if co.values.find do |c| the_default = co.then_expr if c.is_a? Puppet::Pops::Model::LiteralDefault is_match?(test, evaluate(c, scope), c, scope) end result = evaluate(co.then_expr, scope) true # the option was picked end end result # an option was picked, and produced a result else evaluate(the_default, scope) # evaluate the default (should be a nop/nil) if there is no default). end end end # Evaluates a CollectExpression by transforming it into a 3x AST::Collection and then evaluating that. # This is done because of the complex API between compiler, indirector, backends, and difference between # collecting virtual resources and exported resources. # def eval_CollectExpression o, scope # The Collect Expression and its contained query expressions are implemented in such a way in # 3x that it is almost impossible to do anything about them (the AST objects are lazily evaluated, # and the built structure consists of both higher order functions and arrays with query expressions # that are either used as a predicate filter, or given to an indirection terminus (such as the Puppet DB # resource terminus). Unfortunately, the 3x implementation has many inconsistencies that the implementation # below carries forward. # collect_3x = Puppet::Pops::Model::AstTransformer.new().transform(o) collect_3x.evaluate(scope) # the 3x returns an instance of Collector (but it is only registered with the compiler at this # point and does not contain any valuable information (like the result, count of the result etc.) # Ensure that this object does not leak to the Puppet Program being evaluated. # nil end def eval_ParenthesizedExpression(o, scope) evaluate(o.expr, scope) end # This evaluates classes, nodes and resource type definitions to nil, since 3x: # instantiates them, and evaluates thwir parameters and body. This is acheived by # providing bridge AST classes in Puppet::Parser::AST::PopsBridge that bridges a # Pops Program and a Pops Expression. # # Since all Definitions are handled "out of band", they are treated as a no-op when # evaluated. # def eval_Definition(o, scope) nil end def eval_Program(o, scope) evaluate(o.body, scope) end # Produces Array[PObjectType], an array of resource references # def eval_ResourceExpression(o, scope) exported = o.exported virtual = o.virtual type_name = evaluate(o.type_name, scope) o.bodies.map do |body| titles = [evaluate(body.title, scope)].flatten evaluated_parameters = body.operations.map {|op| evaluate(op, scope) } create_resources(o, scope, virtual, exported, type_name, titles, evaluated_parameters) end.flatten.compact end def eval_ResourceOverrideExpression(o, scope) evaluated_resources = evaluate(o.resources, scope) evaluated_parameters = o.operations.map { |op| evaluate(op, scope) } create_resource_overrides(o, scope, [evaluated_resources].flatten, evaluated_parameters) evaluated_resources end # Produces 3x array of parameters def eval_AttributeOperation(o, scope) create_resource_parameter(o, scope, o.attribute_name, evaluate(o.value_expr, scope), o.operator) end # Sets default parameter values for a type, produces the type # def eval_ResourceDefaultsExpression(o, scope) type_name = o.type_ref.value # a QualifiedName's string value evaluated_parameters = o.operations.map {|op| evaluate(op, scope) } create_resource_defaults(o, scope, type_name, evaluated_parameters) # Produce the type evaluate(o.type_ref, scope) end # Evaluates function call by name. # def eval_CallNamedFunctionExpression(o, scope) # The functor expression is not evaluated, it is not possible to select the function to call # via an expression like $a() unless o.functor_expr.is_a? Puppet::Pops::Model::QualifiedName fail(Issues::ILLEGAL_EXPRESSION, o.functor_expr, {:feature=>'function name', :container => o}) end name = o.functor_expr.value assert_function_available(name, o, scope) evaluated_arguments = o.arguments.collect {|arg| evaluate(arg, scope) } # wrap lambda in a callable block if it is present evaluated_arguments << Puppet::Pops::Evaluator::Closure.new(self, o.lambda, scope) if o.lambda call_function(name, evaluated_arguments, o, scope) do |result| # prevent functions that are not r-value from leaking its return value rvalue_function?(name, o, scope) ? result : nil end end # Evaluation of CallMethodExpression handles a NamedAccessExpression functor (receiver.function_name) # def eval_CallMethodExpression(o, scope) unless o.functor_expr.is_a? Puppet::Pops::Model::NamedAccessExpression fail(Issues::ILLEGAL_EXPRESSION, o.functor_expr, {:feature=>'function accessor', :container => o}) end receiver = evaluate(o.functor_expr.left_expr, scope) name = o.functor_expr.right_expr unless name.is_a? Puppet::Pops::Model::QualifiedName fail(Issues::ILLEGAL_EXPRESSION, o.functor_expr, {:feature=>'function name', :container => o}) end name = name.value # the string function name assert_function_available(name, o, scope) evaluated_arguments = [receiver] + (o.arguments || []).collect {|arg| evaluate(arg, scope) } evaluated_arguments << Puppet::Pops::Evaluator::Closure.new(self, o.lambda, scope) if o.lambda call_function(name, evaluated_arguments, o, scope) do |result| # prevent functions that are not r-value from leaking its return value rvalue_function?(name, o, scope) ? result : nil end end # @example # $x ? { 10 => true, 20 => false, default => 0 } # def eval_SelectorExpression o, scope # memo scope level before evaluating test - don't want a match in the case test to leak $n match vars # to expressions after the selector expression. # with_guarded_scope(scope) do test = evaluate(o.left_expr, scope) selected = o.selectors.find do |s| candidate = evaluate(s.matching_expr, scope) candidate == :default || is_match?(test, candidate, s.matching_expr, scope) end if selected evaluate(selected.value_expr, scope) else nil end end end # Evaluates Puppet DSL `if` def eval_IfExpression o, scope with_guarded_scope(scope) do if is_true?(evaluate(o.test, scope)) evaluate(o.then_expr, scope) else evaluate(o.else_expr, scope) end end end # Evaluates Puppet DSL `unless` def eval_UnlessExpression o, scope with_guarded_scope(scope) do unless is_true?(evaluate(o.test, scope)) evaluate(o.then_expr, scope) else evaluate(o.else_expr, scope) end end end # Evaluates a variable (getting its value) # The evaluator is lenient; any expression producing a String is used as a name # of a variable. # def eval_VariableExpression o, scope # Evaluator is not too fussy about what constitutes a name as long as the result # is a String and a valid variable name # name = evaluate(o.expr, scope) # Should be caught by validation, but make this explicit here as well, or mysterious evaluation issues # may occur. case name when String when Numeric else fail(Issues::ILLEGAL_VARIABLE_EXPRESSION, o.expr) end # TODO: Check for valid variable name (Task for validator) # TODO: semantics of undefined variable in scope, this just returns what scope does == value or nil get_variable_value(name, o, scope) end # Evaluates double quoted strings that may contain interpolation # def eval_ConcatenatedString o, scope o.segments.collect {|expr| string(evaluate(expr, scope), scope)}.join end # If the wrapped expression is a QualifiedName, it is taken as the name of a variable in scope. # Note that this is different from the 3.x implementation, where an initial qualified name # is accepted. (e.g. `"---${var + 1}---"` is legal. This implementation requires such concrete # syntax to be expressed in a model as `(TextExpression (+ (Variable var) 1)` - i.e. moving the decision to # the parser. # # Semantics; the result of an expression is turned into a string, nil is silently transformed to empty # string. # @return [String] the interpolated result # def eval_TextExpression o, scope if o.expr.is_a?(Puppet::Pops::Model::QualifiedName) # TODO: formalize, when scope returns nil, vs error string(get_variable_value(o.expr.value, o, scope), scope) else string(evaluate(o.expr, scope), scope) end end def string_Object(o, scope) o.to_s end def string_Symbol(o, scope) case o when :undef '' else o.to_s end end def string_Array(o, scope) ['[', o.map {|e| string(e, scope)}.join(', '), ']'].join() end def string_Hash(o, scope) ['{', o.map {|k,v| string(k, scope) + " => " + string(v, scope)}.join(', '), '}'].join() end def string_Regexp(o, scope) ['/', o.source, '/'].join() end def string_PAbstractType(o, scope) @@type_calculator.string(o) end # Produces concatenation / merge of x and y. # # When x is an Array, y of type produces: # # * Array => concatenation `[1,2], [3,4] => [1,2,3,4]` # * Hash => concatenation of hash as array `[key, value, key, value, ...]` # * any other => concatenation of single value # # When x is a Hash, y of type produces: # # * Array => merge of array interpreted as `[key, value, key, value,...]` # * Hash => a merge, where entries in `y` overrides # * any other => error # # When x is something else, wrap it in an array first. # # When x is nil, an empty array is used instead. # # @note to concatenate an Array, nest the array - i.e. `[1,2], [[2,3]]` # # @overload concatenate(obj_x, obj_y) # @param obj_x [Object] object to wrap in an array and concatenate to; see other overloaded methods for return type # @param ary_y [Object] array to concatenate at end of `ary_x` # @return [Object] wraps obj_x in array before using other overloaded option based on type of obj_y # @overload concatenate(ary_x, ary_y) # @param ary_x [Array] array to concatenate to # @param ary_y [Array] array to concatenate at end of `ary_x` # @return [Array] new array with `ary_x` + `ary_y` # @overload concatenate(ary_x, hsh_y) # @param ary_x [Array] array to concatenate to # @param hsh_y [Hash] converted to array form, and concatenated to array # @return [Array] new array with `ary_x` + `hsh_y` converted to array # @overload concatenate (ary_x, obj_y) # @param ary_x [Array] array to concatenate to # @param obj_y [Object] non array or hash object to add to array # @return [Array] new array with `ary_x` + `obj_y` added as last entry # @overload concatenate(hsh_x, ary_y) # @param hsh_x [Hash] the hash to merge with # @param ary_y [Array] array interpreted as even numbered sequence of key, value merged with `hsh_x` # @return [Hash] new hash with `hsh_x` merged with `ary_y` interpreted as hash in array form # @overload concatenate(hsh_x, hsh_y) # @param hsh_x [Hash] the hash to merge to # @param hsh_y [Hash] hash merged with `hsh_x` # @return [Hash] new hash with `hsh_x` merged with `hsh_y` # @raise [ArgumentError] when `xxx_x` is neither an Array nor a Hash # @raise [ArgumentError] when `xxx_x` is a Hash, and `xxx_y` is neither Array nor Hash. # def concatenate(x, y) x = [x] unless x.is_a?(Array) || x.is_a?(Hash) case x when Array y = case y when Array then y when Hash then y.to_a else [y] end x + y # new array with concatenation when Hash y = case y when Hash then y when Array # Hash[[a, 1, b, 2]] => {} # Hash[a,1,b,2] => {a => 1, b => 2} # Hash[[a,1], [b,2]] => {[a,1] => [b,2]} # Hash[[[a,1], [b,2]]] => {a => 1, b => 2} # Use type calcultor to determine if array is Array[Array[?]], and if so use second form # of call t = @@type_calculator.infer(y) if t.element_type.is_a? Puppet::Pops::Types::PArrayType Hash[y] else Hash[*y] end else raise ArgumentError.new("Can only append Array or Hash to a Hash") end x.merge y # new hash with overwrite else raise ArgumentError.new("Can only append to an Array or a Hash.") end end # Produces the result x \ y (set difference) # When `x` is an Array, `y` is transformed to an array and then all matching elements removed from x. # When `x` is a Hash, all contained keys are removed from x as listed in `y` if it is an Array, or all its keys if it is a Hash. # The difference is returned. The given `x` and `y` are not modified by this operation. # @raise [ArgumentError] when `x` is neither an Array nor a Hash # def delete(x, y) result = x.dup case x when Array y = case y when Array then y when Hash then y.to_a else [y] end y.each {|e| result.delete(e) } when Hash y = case y when Array then y when Hash then y.keys else [y] end y.each {|e| result.delete(e) } else raise ArgumentError.new("Can only delete from an Array or Hash.") end result end # Implementation of case option matching. # # This is the type of matching performed in a case option, using == for every type # of value except regular expression where a match is performed. # def is_match? left, right, o, scope if right.is_a?(Regexp) return false unless left.is_a? String matched = right.match(left) set_match_data(matched, o, scope) # creates or clears ephemeral !!matched # convert to boolean elsif right.is_a?(Puppet::Pops::Types::PAbstractType) && !left.is_a?(Puppet::Pops::Types::PAbstractType) # right is a type and left is not - check if left is an instance of the given type # (The reverse is not terribly meaningful - computing which of the case options that first produces # an instance of a given type). # @@type_calculator.instance?(right, left) else # Handle equality the same way as the language '==' operator (case insensitive etc.) @@compare_operator.equals(left,right) end end def with_guarded_scope(scope) scope_memo = get_scope_nesting_level(scope) begin yield ensure set_scope_nesting_level(scope, scope_memo) end end end diff --git a/lib/puppet/pops/evaluator/runtime3_support.rb b/lib/puppet/pops/evaluator/runtime3_support.rb index cfaed712b..8d5f78697 100644 --- a/lib/puppet/pops/evaluator/runtime3_support.rb +++ b/lib/puppet/pops/evaluator/runtime3_support.rb @@ -1,339 +1,339 @@ module Puppet::Pops::Evaluator::Runtime3Support # Fails the evaluation of _semantic_ with a given issue. # # @param issue [Puppet::Pops::Issue] the issue to report # @param semantic [Puppet::Pops::ModelPopsObject] the object for which evaluation failed in some way. Used to determine origin. # @param options [Hash] hash of optional named data elements for the given issue # @return [!] this method does not return # @raise [Puppet::ParseError] an evaluation error initialized from the arguments (TODO: Change to EvaluationError) # def fail(issue, semantic, options={}, except=nil) diagnostic_producer.accept(issue, semantic, options, except) end # Binds the given variable name to the given value in the given scope. # The reference object `o` is used for origin information. # @todo yardoc this, and pass on origin # def set_variable(name, value, o, scope) scope.setvar(name, value) end # Returns the value of the variable (nil is returned if variable has no value, or if variable does not exist) # def get_variable_value(name, o, scope) # Puppet 3x stores all variables as strings (then converts them back to numeric with a regexp... to see if it is a match variable) # Not ideal, scope should support numeric lookup directly instead. # TODO: consider fixing scope scope.lookupvar(name.to_s) end # Returns true if the variable of the given name is set in the given most nested scope. True is returned even if # variable is bound to nil. # def variable_bound?(name, scope) scope.bound?(name.to_s) end # Returns true of the variable is bound to a value or nil, in the scope or it's parent scopes. # def variable_exists?(name, scope) scope.exist?(name.to_s) end def set_match_data(match_data, o, scope) # TODO: Get file, line from semantic o and pass as options to scope since it tracks where these values # came from. (No it does not! It simply uses them to report errors). # NOTE: The 3x scope adds one ephemeral(match) to its internal stack per match that succeeds ! It never # clears anything. Thus a context that performs many matches will get very deep (there simply is no way to # clear the match variables without rolling back the ephemeral stack.) # This implementation does not attempt to fix this, it behaves the same bad way. unless match_data.nil? scope.ephemeral_from(match_data) end end # Creates a local scope with vairalbes set from a hash of variable name to value # def create_local_scope_from(hash, scope) # two dummy values are needed since the scope tries to give an error message (can not happen in this # case - it is just wrong, the error should be reported by the caller who knows in more detail where it # is in the source. # raise ArgumentError, "Internal error - attempt to create a local scope without a hash" unless hash.is_a?(Hash) scope.ephemeral_from(hash) end # Creates a nested match scope def create_match_scope_from(scope) # Create a transparent match scope (for future matches) scope.new_match_scope(nil) end def get_scope_nesting_level(scope) scope.ephemeral_level end def set_scope_nesting_level(scope, level) # Yup, 3x uses this method to reset the level, it also supports passing :all to destroy all # ephemeral/local scopes - which is a sure way to create havoc. # scope.unset_ephemeral_var(level) end # Adds a relationship between the given `source` and `target` of the given `relationship_type` # @param source [Puppet:Pops::Types::PCatalogEntryType] the source end of the relationship (from) # @param target [Puppet:Pops::Types::PCatalogEntryType] the target end of the relationship (to) # @param relationship_type [:relationship, :subscription] the type of the relationship # def add_relationship(source, target, relationship_type, scope) # The 3x way is to record a Puppet::Parser::Relationship that is evaluated at the end of the compilation. # This means it is not possible to detect any duplicates at this point (and signal where an attempt is made to # add a duplicate. There is also no location information to signal the original place in the logic. The user will have # to go fish. # The 3.x implementation is based on Strings :-o, so the source and target must be transformed. The resolution is # done by Catalog#resource(type, title). To do that, it creates a Puppet::Resource since it is responsible for # translating the name/type/title and create index-keys used by the catalog. The Puppet::Resource has bizarre parsing of # the type and title (scan for [] that is interpreted as type/title (but it gets it wrong). # Moreover if the type is "" or "component", the type is Class, and if the type is :main, it is :main, all other cases # undergo capitalization of name-segments (foo::bar becomes Foo::Bar). (This was earlier done in the reverse by the parser). # Further, the title undergoes the same munging !!! # # That bug infested nest of messy logic needs serious Exorcism! # # Unfortunately it is not easy to simply call more intelligent methods at a lower level as the compiler evaluates the recorded # Relationship object at a much later point, and it is responsible for invoking all the messy logic. # # TODO: Revisit the below logic when there is a sane implementation of the catalog, compiler and resource. For now # concentrate on transforming the type references to what is expected by the wacky logic. # # HOWEVER, the Compiler only records the Relationships, and the only method it calls is @relationships.each{|x| x.evaluate(catalog) } # Which means a smarter Relationship class could do this right. Instead of obtaining the resource from the catalog using # the borked resource(type, title) which creates a resource for the purpose of looking it up, it needs to instead # scan the catalog's resources # # GAAAH, it is even worse! # It starts in the parser, which parses "File['foo']" into an AST::ResourceReference with type = File, and title = foo # This AST is evaluated by looking up the type/title in the scope - causing it to be loaded if it exists, and if not, the given # type name/title is used. It does not search for resource instances, only classes and types. It returns symbolic information # [type, [title, title]]. From this, instances of Puppet::Resource are created and returned. These only have type/title information # filled out. One or an array of resources are returned. # This set of evaluated (empty reference) Resource instances are then passed to the relationship operator. It creates a # Puppet::Parser::Relationship giving it a source and a target that are (empty reference) Resource instances. These are then remembered # until the relationship is evaluated by the compiler (at the end). When evaluation takes place, the (empty reference) Resource instances # are converted to String (!?! WTF) on the simple format "#{type}[#{title}]", and the catalog is told to find a resource, by giving # it this string. If it cannot find the resource it fails, else the before/notify parameter is appended with the target. # The search for the resource being with (you guessed it) again creating an (empty reference) resource from type and title (WTF?!?!). # The catalog now uses the reference resource to compute a key [r.type, r.title.to_s] and also gets a uniqueness key from the # resource (This is only a reference type created from title and type). If it cannot find it with the first key, it uses the # uniqueness key to lookup. # # This is probably done to allow a resource type to munge/translate the title in some way (but it is quite unclear from the long # and convoluted path of evaluation. # In order to do this in a way that is similar to 3.x two resources are created to be used as keys. # # # TODO: logic that creates a PCatalogEntryType should resolve it to ensure it is loaded (to the best of known_resource_types knowledge). # If this is not done, the order in which things are done may be different? OTOH, it probably works anyway :-) # type, title = catalog_type_to_split_type_title(source) source_resource = Puppet::Resource.new(type, title) type, title = catalog_type_to_split_type_title(target) target_resource = Puppet::Resource.new(type, title) scope.compiler.add_relationship(Puppet::Parser::Relationship.new(source_resource, target_resource, type)) end # Box value `v` to numeric or fails. # The given value `v` is converted to Numeric, and if that fails the operation # calls {#fail}. # @param v [Object] the value to convert # @param o [Object] originating instruction # @param scope [Object] the (runtime specific) scope where evaluation of o takes place # @return [Numeric] value `v` converted to Numeric. # - def box_numeric(v, o, scope) + def coerce_numeric(v, o, scope) unless n = Puppet::Pops::Utils.to_n(v) fail(Puppet::Pops::Issues::NOT_NUMERIC, o, {:value => v}) end n end # Asserts that the given function name resolves to an available function. The function is loaded # as a side effect. Fails if the function does not exist. # def assert_function_available(name, o, scope) fail(Puppet::Pops::Issues::UNKNOWN_FUNCTION, o, {:name => name}) unless Puppet::Parser::Functions.function(name) end def call_function(name, args, o, scope) # Should arguments be mapped from :undef to '' (3x functions expects this - but it is bad) mapped_args = args.map {|a| a == :undef ? '' : a } scope.send("function_#{name}", mapped_args) end # Returns true if the function produces a value def rvalue_function?(name, o, scope) Puppet::Parser::Functions.rvalue?(name) end # The o is used for source reference # TODO: The line information is wrong - it is cheating atm. def create_resource_parameter(o, scope, name, value, operator) Puppet::Parser::Resource::Param.new( :name => name, :value => value, :source => scope.source, :line => -1, :file => 'TODO:Get file', :add => operator == :'+>' ) end def create_resources(o, scope, virtual, exported, type_name, resource_titles, evaluated_parameters) # TODO: Unknown resource causes creation of Resource to fail with ArgumentError, should give # a proper Issue # resolve in scope. TODO: Investigate what happens here - opportunity to optimize? fully_qualified_type, resource_titles = scope.resolve_type_and_titles(type_name, resource_titles) # Build a resource for each title resource_titles.map do |resource_title| resource = Puppet::Parser::Resource.new( fully_qualified_type, resource_title, :parameters => evaluated_parameters, # TODO: Location :file => 'TODO: file location', :line => -1, :exported => exported, :virtual => virtual, # WTF is this? Which source is this? The file? The name of the context ? :source => scope.source, :scope => scope, :strict => true ) if resource.resource_type.is_a? Puppet::Resource::Type resource.resource_type.instantiate_resource(scope, resource) end scope.compiler.add_resource(scope, resource) scope.compiler.evaluate_classes([resource_title], scope, false, true) if fully_qualified_type == 'class' # Turn the resource into a PType (a reference to a resource type) # weed out nil's resource_to_ptype(resource) end end # Defines default parameters for a type with the given name. # def create_resource_defaults(o, scope, type_name, evaluated_parameters) # Note that name must be capitalized in this 3x call # The 3x impl creates a Resource instance with a bogus title and then asks the created resource # for the type of the name scope.define_settings(type_name.capitalize, evaluated_parameters) end # Creates resource overrides for all resource type objects in evaluated_resources. The same set of # evaluated parameters are applied to all. # def create_resource_overrides(o, scope, evaluated_resources, evaluated_parameters) evaluated_resources.each do |r| resource = Puppet::Parser::Resource.new( r.type_name, r.title, :parameters => evaluated_parameters, :file => 'TODO: file location', :line => -1, # WTF is this? Which source is this? The file? The name of the context ? :source => scope.source, :scope => scope ) scope.compiler.add_override(resource) end end # Finds a resource given a type and a title. # def find_resource(scope, type_name, title) scope.compiler.findresource(type_name, title) end # Returns the value of a resource's parameter by first looking up the parameter in the resource # and then in the defaults for the resource. Since the resource exists (it must in order to look up its # parameters, any overrides have already been applied). Defaults are not applied to a resource until it # has been finished (which typically has not taked place when this is evaluated; hence the dual lookup). # def get_resource_parameter_value(scope, resource, parameter_name) val = resource[parameter_name] if val.nil? && defaults = scope.lookupdefaults(resource.type) # NOTE: 3x resource keeps defaults as hash using symbol for name as key to Parameter which (again) holds # name and value. param = defaults[parameter_name.to_sym] val = param.value end val end # Returns true, if the given name is the name of a resource parameter. # def is_parameter_of_resource?(scope, resource, name) resource.valid_parameter?(name) end def resource_to_ptype(resource) nil if resource.nil? type_calculator.infer(resource) end # This is the same type of "truth" as used in the current Puppet DSL. # def is_true? o # Is the value true? This allows us to control the definition of truth # in one place. case o when '' false when :undef false else !!o end end # Utility method for TrueClass || FalseClass # @param x [Object] the object to test if it is instance of TrueClass or FalseClass def is_boolean? x x.is_a?(TrueClass) || x.is_a?(FalseClass) end private # Produces an array with [type, title] from a PCatalogEntryType # Used to produce reference resource instances (used when 3x is operating on a resource). # def catalog_type_to_split_type_title(catalog_type) case catalog_type when Puppet::Pops::Types::PHostClassType return ['Class', catalog_type.class_name] when Puppet::Pops::Types::PResourceType return [catalog_type.type_name, catalog_type.title] else raise ArgumentError, "Cannot split the type #{catalog_type.class}, it is neither a PHostClassType, nor a PResourceClass." end end # Creates a diagnostic producer def diagnostic_producer Puppet::Pops::Validation::DiagnosticProducer.new( ExceptionRaisingAcceptor.new(), # Raises exception on all issues Puppet::Pops::Validation::SeverityProducer.new(), # All issues are errors Puppet::Pops::Model::ModelLabelProvider.new()) end # An acceptor of diagnostics that immediately raises an exception. class ExceptionRaisingAcceptor < Puppet::Pops::Validation::Acceptor def accept(diagnostic) super Puppet::Pops::IssueReporter.assert_and_report(self, {:message => "Evaluation Error:" }) raise ArgumentError, "Internal Error: Configuration of runtime error handling wrong: should have raised exception" end end end \ No newline at end of file