#!/usr/bin/env ruby

# Copyright (C) 2010, 2013 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.


base_directory = ENV['TARGET_BUILD_DIR'] or throw "Unable to find TARGET_BUILD_DIR in the environment!"

Dir.chdir base_directory

$PERMITTED_INCLUDE_TYPES = { :public => [ :public ], :private => [ :public, :private ] }

$HEADER_NAMES_TO_TYPE = { }
$HEADERS_BY_TYPE = { :public => [], :private => [] }

$error_printed = false

def print_error msg
  $error_printed = true
  STDERR.puts "error: #{msg}"
end

def build_header_maps
  all_headers = `find #{ENV['PUBLIC_HEADERS_FOLDER_PATH']} #{ENV['PRIVATE_HEADERS_FOLDER_PATH']} -type f -name '*.h'`.split

  all_headers.each do |header|
    if /\/Headers\/(.*)/.match(header)
      $HEADER_NAMES_TO_TYPE[$1] = :public
      $HEADERS_BY_TYPE[:public] << header
    elsif /\/PrivateHeaders\/(.*)/.match(header)
      $HEADER_NAMES_TO_TYPE[$1] = :private
      $HEADERS_BY_TYPE[:private] << header
    else
      print_error "Unknown header type: #{header}"
    end
  end
end

def resolve_include(header, included_header, permitted_types)
  # Ignore includes that aren't in the typical framework style.
  return unless /<([^\/]+)\/(.*)>/.match(included_header)

  framework, included_header_name = [$1, $2]

  # Ignore includes that aren't related to other WebKit headers.
  return unless framework =~ /^Web/

  # A header of any type including a WebCore header is a recipe for disaster.
  if framework == "WebCore"
    print_error "#{header} included #{included_header}!"
    return
  end

  header_type = $HEADER_NAMES_TO_TYPE[included_header_name]

  if not header_type
    print_error "#{header} included #{included_header} but I could not find a header of that name!"
  elsif not permitted_types.member?(header_type)
    print_error "#{header} included #{included_header} which is #{header_type}!"
  end
end

def verify_includes(header, permitted_types)
  File.open(header) do |file|
    file.each_line do |line|
      if /#(include|import) (.*)/.match(line)
        resolve_include(header, $2, permitted_types)
      end
    end
  end
end

build_header_maps

$HEADERS_BY_TYPE.each do |header_type, headers|
  permitted_types = $PERMITTED_INCLUDE_TYPES[header_type]
  headers.each do |header|
    verify_includes header, permitted_types
  end
end

exit 1 if $error_printed