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##
# Racc plugin for hoe.
#
# === Tasks Provided:
#
# 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.
module Hoe::Racc
##
# Optional: Defines what tasks need to generate parsers/lexers first.
#
# Defaults to [:multi, :test, :check_manifest]
#
# If you have extra tasks that require your parser/lexer to be
# built, add their names here in your hoe spec. eg:
#
# racc_tasks << :debug
attr_accessor :racc_tasks
##
# Optional: Defines what flags to use for racc. default: "-v -l"
attr_accessor :racc_flags
##
# Optional: Defines what flags to use for oedipus_lex. default: "--independent"
attr_accessor :oedipus_options
##
# Initialize variables for racc plugin.
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
##
# Activate the racc dependencies
def activate_racc_deps
dependency "racc", "~> 1.5", :development
end
##
# Define tasks for racc plugin
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} from #{OedipusLex::VERSION}"
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
end
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