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# frozen_string_literal: true
# scanner.rl imports the other files
RAGEL_SOURCE_PATH = File.join(__dir__, '../lib/regexp_parser/scanner/scanner.rl')
RAGEL_OUTPUT_PATH = File.join(__dir__, '../lib/regexp_parser/scanner.rb')
desc 'Process the ragel source files and output ruby code'
task ragel: 'ragel:install' do
# -L = omit line hint comments; -p = print human-readable labels
flags = ENV['DEBUG_RAGEL'].to_i == 1 ? ['-p'] : ['-L']
# -F1 = use flat table-driven FSM, about 25% larger code, but about 30% faster
flags << '-F1'
sh 'ragel', '-R', RAGEL_SOURCE_PATH, '-o', RAGEL_OUTPUT_PATH, *flags
cleaned_contents =
File
.read(RAGEL_OUTPUT_PATH)
.gsub(/[ \t]+$/, '') # remove trailing whitespace emitted by ragel
.gsub(/ then$/, '') # remove redundant then keywords emitted by ragel
.gsub(/(?<=\d,)[ \t]+|^[ \t]+(?=-?\d)/, '') # compact FSM tables (saves ~6KB)
.gsub(/(?<=\S ) +/, '') # compact in-line spaces
.gsub(/\n(?:[ \t]*\n){2,}/, "\n\n") # compact blank lines
File.open(RAGEL_OUTPUT_PATH, 'w') do |file|
file.puts(<<-RUBY.gsub(/^\s+/, ''))
# -*- frozen_string_literal: true; warn-indent: false -*-
#
# THIS IS A GENERATED FILE, DO NOT EDIT DIRECTLY
#
# This file was generated from #{RAGEL_SOURCE_PATH.split('/').last}
# by running `$ bundle exec rake ragel`
RUBY
file.write(cleaned_contents)
end
# Remove redundant begin/end blocks emitted by ragel.
# This saves 1KB, but is disabled for now because it increases build time from 0.2s to 1s.
# `bundle exec rubocop --only Style/RedundantBegin --autocorrect #{RAGEL_OUTPUT_PATH}`
end
namespace :ragel do
desc 'Delete the ragel generated source file'
task :clean do
sh "rm -f #{RAGEL_OUTPUT_PATH}"
end
desc 'Make sure that ragel is installed'
task :install do
next if ENV['CI']
if system('sh -c "command -v ragel"')
# already installed
elsif system('sh -c "command -v brew"')
puts 'ragel not found, installing with homebrew ...'
`brew install ragel`
elsif system('sh -c "command -v apt-get"')
puts 'ragel not found, installing with apt-get ...'
`sudo apt-get install -y ragel`
else
raise 'Could not install ragel. Please install it manually.'
end
end
desc 'Deprecated alias for the ragel task'
task rb: :ragel do
warn 'The `ragel:rb` task is deprecated, please use `ragel` instead.'
end
end
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