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vendor/rails/railties/lib/rails/backtrace_cleaner.rb

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module Rails

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  class BacktraceCleaner < ActiveSupport::BacktraceCleaner

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    ERB_METHOD_SIG = /:in `_run_erb_.*/

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    RAILS_GEMS   = %w( actionpack activerecord actionmailer activesupport activeresource rails )

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    VENDOR_DIRS  = %w( vendor/rails )

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    SERVER_DIRS  = %w( lib/mongrel bin/mongrel

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                       lib/passenger bin/passenger-spawn-server

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                       lib/rack )

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    RAILS_NOISE  = %w( script/server )

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    RUBY_NOISE   = %w( rubygems/custom_require benchmark.rb )

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    ALL_NOISE    = VENDOR_DIRS + SERVER_DIRS + RAILS_NOISE + RUBY_NOISE

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    def initialize

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      super

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      add_filter   { |line| line.sub("#{RAILS_ROOT}/", '') }

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      add_filter   { |line| line.sub(ERB_METHOD_SIG, '') }

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      add_filter   { |line| line.sub('./', '/') } # for tests

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      add_gem_filters

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      add_silencer { |line| ALL_NOISE.any? { |dir| line.include?(dir) } }

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      add_silencer { |line| RAILS_GEMS.any? { |gem| line =~ /^#{gem} / } }

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      add_silencer { |line| line =~ %r(vendor/plugins/[^\/]+/lib) }

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    end

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    private

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      def add_gem_filters

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        Gem.path.each do |path|

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          # http://gist.github.com/30430

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          add_filter { |line| line.sub(/(#{path})\/gems\/([a-z]+)-([0-9.]+)\/(.*)/, '\2 (\3) \4')}

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        end

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        vendor_gems_path = Rails::GemDependency.unpacked_path.sub("#{RAILS_ROOT}/",'')

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        add_filter { |line| line.sub(/(#{vendor_gems_path})\/([a-z]+)-([0-9.]+)\/(.*)/, '\2 (\3) [v] \4')}

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      end

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  end

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  # For installing the BacktraceCleaner in the test/unit

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  module BacktraceFilterForTestUnit #:nodoc:

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    def self.included(klass)

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      klass.send :alias_method_chain, :filter_backtrace, :cleaning

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    end

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    def filter_backtrace_with_cleaning(backtrace, prefix=nil)

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      backtrace = filter_backtrace_without_cleaning(backtrace, prefix)

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      backtrace = backtrace.first.split("\n") if backtrace.size == 1

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      Rails.backtrace_cleaner.clean(backtrace)

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    end

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  end

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end

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