Racc plugin for hoe.
lexer |
Generate lexers for all .rex files in your Manifest.txt. |
parser |
Generate parsers for all .y files in your Manifest.txt. |
.y -> .rb rule |
Generate a parser using racc. |
.rex -> .rb rule |
Generate a lexer using oedipus_lex. |
Activate the racc dependencies
# File lib/hoe/racc.rb, line 52 def activate_racc_deps dependency 'racc', '~> 1.4.6', :development end
Define tasks for racc plugin
# File lib/hoe/racc.rb, line 59 def define_racc_tasks racc_files = self.spec.files.find_all { |f| f =~ /\.y$/ } rex_files = self.spec.files.find_all { |f| f =~ /\.rex$/ } parser_files = racc_files.map { |f| f.sub(/\.y$/, ".rb") } lexer_files = rex_files.map { |f| f.sub(/\.rex$/, ".rex.rb") } self.clean_globs += parser_files self.clean_globs += lexer_files rule ".rb" => ".y" do |t| begin sh "racc #{racc_flags} -o #{t.name} #{t.source}" rescue abort "need racc, sudo gem install racc" end end # HACK: taken from oedipus_lex's .rake file to bypass isolate bootstrap rule ".rex.rb" => proc {|path| path.sub(/\.rb$/, "") } do |t| require "oedipus_lex" warn "Generating #{t.name} from #{t.source}" oedipus = OedipusLex.new oedipus_options oedipus.parse_file t.source File.open t.name, "w" do |f| f.write oedipus.generate end end task :isolate # stub task desc "build the parser" unless parser_files.empty? task :parser => :isolate desc "build the lexer" unless lexer_files.empty? task :lexer => :isolate task :parser => parser_files task :lexer => lexer_files racc_tasks.each do |t| task t => [:parser, :lexer] end end
Initialize variables for racc plugin.
# File lib/hoe/racc.rb, line 38 def initialize_racc self.racc_tasks = [:multi, :test, :check_manifest] # -v = verbose # -l = no-line-convert (they don't ever line up anyhow) self.racc_flags ||= "-v -l" self.oedipus_options ||= { :do_parse => false } end
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