check_for_hhvm_errors.rb

#!/usr/bin/env ruby

require 'fileutils'
require 'json'

contents = JSON.parse(IO.read(ARGV[0]))

## There are error types that cause lots of false positives. HHVM is still not perfect for them and
## there is not much sense to mark the commit as failed because of the. As HHVM grows better, we need
## to reevaluate the detection of those errors again.

contents[1].delete('UnknownClass')
contents[1].delete('UseUndeclaredConstant')
contents[1].delete('PHPIncludeFileNotFound')


## These are the files to ignore errors reported on. Those reside in the external directory as those files
## are outside of our control. HHVM does not offer effective way to read declarations from them but to
## not look for errors in them. That's why they are manually removed from the results file

files_to_ignore = %w[libs/external]

## Remove entries from the external files
contents[1].each do |name_of_error, array_of_errors|
  array_of_errors.delete_if {|error| files_to_ignore.any? { |w| error['c1'][0] =~ /#{w}/ }}
end

## Clear the empty error types
contents[1].delete_if {|name_of_error, array_of_errors| array_of_errors.empty?}

errors = 0

puts "\n"

## Print the remaining errors
contents[1].each do |name_of_error, array_of_errors|

  puts "#{name_of_error} in file:"

  array_of_errors.each do |error|

    # Temporary workaround until HHVM is fixed: https://github.com/facebook/hhvm/issues/2479
    next if error['d'].include? 'getTransitions'

    puts "#{error['c1'][0]}, line: #{error['c1'][1]}, problem entry: #{error['d']}"

    errors += 1

  end

  puts "\n"

end

exit -1 unless errors == 0