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Mini Shell
Mini Shell
#!/usr/bin/env ruby
#
# $Id$
#
# Copyright (c) 1999-2006 Minero Aoki
#
# This program is free software.
# You can distribute/modify this program under the same terms of ruby.
# see the file "COPYING".
require 'racc/static'
require 'optparse'
def main
output = nil
debug_parser = false
make_logfile = false
logfilename = nil
make_executable = false
rubypath = nil
embed_runtime = false
debug_flags = Racc::DebugFlags.new
line_convert = true
line_convert_all = false
omit_action_call = true
superclass = nil
check_only = false
verbose = false
profiler = RaccProfiler.new(false)
parser = OptionParser.new
parser.banner = "Usage: #{File.basename($0)} [options] <input>"
parser.on('-o', '--output-file=PATH',
'output file name [<input>.tab.rb]') {|name|
output = name
}
parser.on('-t', '--debug', 'Outputs debugging parser.') {|fl|
debug_parser = fl
}
parser.on('-g', 'Equivalent to -t (obsolete).') {|fl|
$stderr.puts "racc -g is obsolete. Use racc -t instead." if $VERBOSE
debug_parser = fl
}
parser.on('-v', '--verbose',
'Creates <filename>.output log file.') {|fl|
make_logfile = fl
}
parser.on('-O', '--log-file=PATH',
'Log file name [<input>.output]') {|path|
make_logfile = true
logfilename = path
}
parser.on('-e', '--executable [RUBYPATH]', 'Makes executable parser.') {|path|
executable = true
rubypath = (path == 'ruby' ? nil : path)
}
parser.on('-E', '--embedded', "Embeds Racc runtime in output.") {
embed_runtime = true
}
parser.on('--line-convert-all', 'Converts line numbers of user codes.') {
line_convert_all = true
}
parser.on('-l', '--no-line-convert', 'Never convert line numbers.') {
line_convert = false
line_convert_all = false
}
parser.on('-a', '--no-omit-actions', 'Never omit actions.') {
omit_action_call = false
}
parser.on('--superclass=CLASSNAME',
'Uses CLASSNAME instead of Racc::Parser.') {|name|
superclass = name
}
parser.on('--runtime=FEATURE',
"Uses FEATURE instead of 'racc/parser'") {|feat|
runtime = feature
}
parser.on('-C', '--check-only', 'Checks syntax and quit immediately.') {|fl|
check_only = fl
}
parser.on('-S', '--output-status', 'Outputs internal status time to time.') {
verbose = true
}
parser.on('-P', 'Enables generator profile') {
profiler = RaccProfiler.new(true)
}
parser.on('-D flags', "Flags for Racc debugging (do not use).") {|flags|
debug_flags = Racc::DebugFlags.parse_option_string(flags)
}
#parser.on('--no-extensions', 'Run Racc without any Ruby extension.') {
# Racc.const_set :Racc_No_Extentions, true
#}
parser.on('--version', 'Prints version and quit.') {
puts "racc version #{Racc::Version}"
exit 0
}
parser.on('--runtime-version', 'Prints runtime version and quit.') {
printf "racc runtime version %s (rev. %s); %s\n",
Racc::Parser::Racc_Runtime_Version,
Racc::Parser::Racc_Runtime_Revision,
if Racc::Parser.racc_runtime_type == 'ruby'
sprintf('ruby core version %s (rev. %s)',
Racc::Parser::Racc_Runtime_Core_Version_R,
Racc::Parser::Racc_Runtime_Core_Revision_R)
else
sprintf('c core version %s (rev. %s)',
Racc::Parser::Racc_Runtime_Core_Version_C,
Racc::Parser::Racc_Runtime_Core_Revision_C)
end
exit 0
}
parser.on('--copyright', 'Prints copyright and quit.') {
puts Racc::Copyright
exit 0
}
parser.on('--help', 'Prints this message and quit.') {
puts parser.help
exit 1
}
begin
parser.parse!
rescue OptionParser::ParseError => err
$stderr.puts err.message
$stderr.puts parser.help
exit 1
end
if ARGV.empty?
$stderr.puts 'no input'
exit 1
end
if ARGV.size > 1
$stderr.puts 'too many input'
exit 1
end
input = ARGV[0]
begin
$stderr.puts 'Parsing grammar file...' if verbose
result = profiler.section('parse') {
parser = Racc::GrammarFileParser.new(debug_flags)
parser.parse(File.read(input), File.basename(input))
}
if check_only
$stderr.puts 'syntax ok'
exit 0
end
$stderr.puts 'Generating LALR states...' if verbose
states = profiler.section('nfa') {
Racc::States.new(result.grammar).nfa
}
$stderr.puts "Resolving #{states.size} states..." if verbose
profiler.section('dfa') {
states.dfa
}
$stderr.puts 'Creating parser file...' if verbose
params = result.params.dup
# Overwrites parameters given by a grammar file with command line options.
params.superclass = superclass if superclass
params.omit_action_call = true if omit_action_call
# From command line option
if make_executable
params.make_executable = true
params.interpreter = rubypath
end
params.debug_parser = debug_parser
params.convert_line = line_convert
params.convert_line_all = line_convert_all
params.embed_runtime = embed_runtime
profiler.section('generation') {
generator = Racc::ParserFileGenerator.new(states, params)
generator.generate_parser_file(output || make_filename(input, '.tab.rb'))
}
if make_logfile
profiler.section('logging') {
$stderr.puts 'Creating log file...' if verbose
logfilename ||= make_filename(output || File.basename(input), '.output')
File.open(logfilename, 'w') {|f|
Racc::LogFileGenerator.new(states, debug_flags).output f
}
}
end
if debug_flags.status_logging
log_useless states.grammar
log_conflict states
else
report_useless states.grammar
report_conflict states
end
profiler.report
rescue Racc::Error, Errno::ENOENT, Errno::EPERM => err
raise if $DEBUG or debug_flags.any?
lineno = err.message.slice(/\A\d+:/).to_s
$stderr.puts "#{File.basename $0}: #{input}:#{lineno} #{err.message.strip}"
exit 1
end
end
def make_filename(path, suffix)
path.sub(/(?:\..*?)?\z/, suffix)
end
def report_conflict(states)
if states.should_report_srconflict?
$stderr.puts "#{states.n_srconflicts} shift/reduce conflicts"
end
if states.rrconflict_exist?
$stderr.puts "#{states.n_rrconflicts} reduce/reduce conflicts"
end
end
def log_conflict(states)
logging('w') {|f|
f.puts "ex#{states.grammar.n_expected_srconflicts}"
if states.should_report_srconflict?
f.puts "sr#{states.n_srconflicts}"
end
if states.rrconflict_exist?
f.puts "rr#{states.n_rrconflicts}"
end
}
end
def report_useless(grammar)
if grammar.useless_nonterminal_exist?
$stderr.puts "#{grammar.n_useless_nonterminals} useless nonterminals"
end
if grammar.useless_rule_exist?
$stderr.puts "#{grammar.n_useless_rules} useless rules"
end
if grammar.start.useless?
$stderr.puts 'fatal: start symbol does not derive any sentence'
end
end
def log_useless(grammar)
logging('a') {|f|
if grammar.useless_nonterminal_exist?
f.puts "un#{grammar.n_useless_nonterminals}"
end
if grammar.useless_rule_exist?
f.puts "ur#{grammar.n_useless_rules}"
end
}
end
def logging(mode, &block)
File.open("log/#{File.basename(ARGV[0])}", mode, &block)
end
class RaccProfiler
def initialize(really)
@really = really
@log = []
unless ::Process.respond_to?(:times)
# Ruby 1.6
@class = ::Time
else
@class = ::Process
end
end
def section(name)
if @really
t1 = @class.times.utime
result = yield
t2 = @class.times.utime
@log.push [name, t2 - t1]
result
else
yield
end
end
def report
return unless @really
f = $stderr
total = cumulative_time()
f.puts '--task-----------+--sec------+---%-'
@log.each do |name, time|
f.printf "%-19s %s %3d%%\n", name, pjust(time,4,4), (time/total*100).to_i
end
f.puts '-----------------+-----------+-----'
f.printf "%-20s%s\n", 'total', pjust(total,4,4)
end
private
def cumulative_time
t = @log.inject(0) {|sum, (name, time)| sum + time }
t == 0 ? 0.01 : t
end
def pjust(num, i, j)
m = /(\d+)(\.\d+)?/.match(num.to_s)
str = m[1].rjust(i)
str.concat m[2].ljust(j+1)[0,j+1] if m[2]
str
end
end
main
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