/usr/bin/racc2y is in racc 1.4.14-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | #!/usr/bin/ruby
#
# $Id$
#
# Copyright (c) 1999-2006 Minero Aoki
#
# This program is feee software.
# You can distribute/modify this program under the terms of
# the GNU LGPL, Lesser General Public License version 2.1.
# For details of the LGPL, see the file "COPYING".
#
require 'racc/grammarfileparser'
require 'racc/info'
require 'optparse'
def main
@with_action = true
with_header = false
with_inner = false
with_footer = false
output = nil
parser = OptionParser.new
parser.banner = "Usage: #{File.basename($0)} [-AHIF] [-oFILENAME] GRAMMARFILE"
parser.on('-o', '--output=FILENAME', 'output file name [<input>.yacc]') {|name|
output = name
}
parser.on('-A', '--without-action', 'Does not include actions.') {
@with_action = false
}
parser.on('-H', '--with-header', 'Includes header part.') {
with_header = true
}
parser.on('-I', '--with-inner', 'Includes inner part.') {
with_inner = true
}
parser.on('-F', '--with-footer', 'Includes footer part.') {
with_footer = true
}
parser.on('--version', 'Prints version and quit.') {
puts "racc2y version #{Racc::Version}"
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 file"
exit 1
end
unless ARGV.size == 1
$stderr.puts "too many inputs"
exit 1
end
input = ARGV[0]
begin
result = Racc::GrammarFileParser.parse_file(input)
result.grammar.init
File.open(output || "#{input}.yacc", 'w') {|f|
f.puts "/* generated from #{input} */"
if with_header
f.puts
f.puts '%{'
print_user_codes f, result.params.header
f.puts '%}'
end
f.puts
print_terminals f, result.grammar
f.puts
print_precedence_table f, precedence_table(result.grammar)
f.puts
f.puts '%%'
print_grammar f, result.grammar
f.puts '%%'
if with_inner
f.puts '/*---- inner ----*/'
print_user_codes f, result.params.inner
end
if with_footer
f.puts '/*---- footer ----*/'
print_user_codes f, result.params.footer
end
}
rescue SystemCallError => err
$stderr.puts err.message
exit 1
end
end
def print_terminals(f, grammar)
init_indent = '%token'.size
f.print '%token'
columns = init_indent
grammar.symboltable.each_terminal do |t|
next unless t.terminal?
next if t.dummy?
next if t == grammar.symboltable.anchor
next if t == grammar.symboltable.error
unless t.value.kind_of?(String)
if columns > 60
f.puts
f.print ' ' * init_indent
columns = init_indent
end
columns += f.write(" #{yacc_symbol(t)}")
end
end
f.puts
end
def precedence_table(grammar)
table = []
grammar.symboltable.select {|sym| sym.precedence }.each do |sym|
(table[sym.prec] ||= [sym.assoc]).push sym
end
table.compact
end
def print_precedence_table(f, table)
return if table.empty?
f.puts '/* precedance table */'
table.each do |syms|
assoc = syms.shift
f.printf '%%%-8s ', assoc.to_s.downcase
f.puts syms.map {|s| yacc_symbol(s) }.join(' ')
end
f.puts
end
def print_grammar(f, grammar)
prev_target = nil
indent = 10
embactions = []
grammar.each do |rule|
if rule.target.dummy?
embactions.push rule.action unless rule.action.empty?
next
end
if rule.target == prev_target
f.print ' ' * indent, '|'
else
prev_target = rule.target
f.printf "\n%-10s:", yacc_symbol(prev_target)
end
rule.symbols.each do |s|
if s.dummy? # target of dummy rule for embedded action
f.puts
print_action f, embactions.shift, indent
f.print ' ' * (indent + 1)
else
f.print ' ', yacc_symbol(s)
end
end
if rule.specified_prec
f.print ' %prec ', yacc_symbol(rule.specified_prec)
end
f.puts
unless rule.action.empty?
print_action f, rule.action, indent
end
end
end
def print_action(f, action, indent)
return unless @with_action
f.print ' ' * (indent + 4), "{\n"
f.print ' ' * (indent + 6), action.source.text.strip, "\n"
f.print ' ' * (indent + 4) , "}\n"
end
def print_user_codes(f, srcs)
return if srcs.empty?
srcs.each do |src|
f.puts src.text
end
end
def yacc_symbol(s)
s.to_s.gsub('"', "'")
end
main
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