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module Rake
module RagelGenerationTasks
RAGEL_INCLUDE_PATTERN = /include \w+ "([^"]+)";/
RAGEL_VERSION_COMMAND = "ragel -v"
attr_accessor :rl_dir
attr_accessor :machines
def init(name = nil, gem_spec = nil)
super
@rl_dir = "ragel"
@machines = %w(scan inline attributes)
end
def lang
raise NotImplementedError
end
def source_files
@source_files ||= machines.map {|m| target(m) }
end
def define
super
define_ragel_tasks
end
def define_ragel_tasks
machines.each do |machine|
file target(machine) => [*ragel_sources(machine)] do
mkdir_p(File.dirname(target(machine))) unless File.directory?(File.dirname(target(machine)))
ensure_ragel_version
sh "ragel #{flags} #{lang_ragel(machine)} -o #{target(machine)}"
end
file extconf => [target(machine)] if lang == 'c'
end
end
def target(machine)
{
'scan' => {
'c' => "#{@ext_dir}/redcloth_scan.c",
'rb' => "#{@ext_dir}/redcloth_scan.rb"
},
'inline' => {
'c' => "#{@ext_dir}/redcloth_inline.c",
'rb' => "#{@ext_dir}/redcloth_inline.rb"
},
'attributes' => {
'c' => "#{@ext_dir}/redcloth_attributes.c",
'rb' => "#{@ext_dir}/redcloth_attributes.rb"
}
}[machine][lang]
end
def lang_ragel(machine)
"#{@rl_dir}/redcloth_#{machine}.#{lang}.rl"
end
def ragel_sources(machine)
deps = [lang_ragel(machine), ragel_file_dependencies(lang_ragel(machine))].flatten.dup
deps += ["#{@ext_dir}/redcloth.h"] if lang == 'c'
deps
# FIXME: merge that header file into other places so it can be eliminated?
end
def ragel_file_dependencies(ragel_file)
found = find_ragel_includes(ragel_file)
found + found.collect {|file| ragel_file_dependencies(file)}
end
def find_ragel_includes(file)
File.open(file).grep(RAGEL_INCLUDE_PATTERN) { $1 }.map do |file|
"#{@rl_dir}/#{file}"
end
end
def flags
code_style_flag = preferred_code_style ? " -" + preferred_code_style : ""
"-#{host_language_flag}#{code_style_flag}"
end
def host_language_flag
{
'c' => 'C',
'rb' => 'R'
}[lang]
end
def preferred_code_style
{
'c' => 'T0',
'rb' => 'F1'
}[lang]
end
def ensure_ragel_version
@ragel_v ||= `ragel -v`[/(version )(\S*)/,2].split('.').map{|s| s.to_i}
raise unless @ragel_v[0] > 6 || (@ragel_v[0] == 6 && @ragel_v[1] >= 3)
rescue
STDERR.puts "Ragel 6.3 or greater is required."
exit(1)
end
end
class RagelExtensionTask < ExtensionTask
include RagelGenerationTasks
def lang
"c"
end
end
end
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