oga/task/lexer.rake

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rule '.rb' => '.rl' do |task|
Cliver.assert('ragel', '~> 6.7')
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sh "ragel -F1 -R #{task.source} -o #{task.name}"
puts "Applying patch http://git.io/ow6e1A to #{task.name}"
# Patches the lexer based on http://git.io/ow6e1A.
input = File.read(task.source)
output = File.read(task.name)
getkey = input.match(/getkey\s+(.+);/)[1]
output = output.gsub(getkey, '_wide')
output = output.gsub('_trans = if', "_wide = #{getkey}\n _trans = if")
File.open(task.name, 'w') do |handle|
handle.write(output)
end
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end
desc 'Generates the lexer'
task :lexer => [LEXER_OUTPUT]