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require 'metasploit/framework/obfuscation/crandomizer/utility'
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require 'metasploit/framework/obfuscation/crandomizer/modifier'
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module Metasploit
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  module Framework
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    module Obfuscation
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      module CRandomizer
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        class Parser
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          attr_accessor :max_random_weight
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          attr_accessor :fake_functions_collection
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          # Initializes a Metasploit::Framework::Obfuscation::CRandomizer::Parser instance.
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          #
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          # @param weight [Integer] Randomness of the code.
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          # @param fake_functions [Metasploit::Framework::Obfuscation::CRandomizer::CodeFactory::FakeFunctionCollection]
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          def initialize(weight, fake_functions=nil)
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            @max_random_weight = weight
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            @fake_functions_collection = fake_functions
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          end
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          # Returns a parser.
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          #
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          # @param template [String] Source code to parse.
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          # @return [Metasm::C::Parser]
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          def parse(template)
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            main_parser = Metasploit::Framework::Obfuscation::CRandomizer::Utility.parse(template)
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            modifier = Metasploit::Framework::Obfuscation::CRandomizer::Modifier.new(main_parser, fake_functions_collection, max_random_weight)
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            main_parser.toplevel.statements.each do |s|
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              case s.var.type
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              when Metasm::C::Function
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                # Some function objects such as declarations don't really have
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                # any statements, if we run into something like that, skip it.
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                next unless s.var.initializer.respond_to?(:statements)
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                modifier.modify_function(s)
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              end
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            end
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            main_parser
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          end
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        end
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      end
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    end
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  end
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end
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