/usr/share/doc/rexical/examples/calc3.tab.rb is in rexical 1.0.5-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# DO NOT MODIFY!!!!
# This file is automatically generated by racc 1.4.4
# from racc grammer file "calc3.racc".
#
require 'racc/parser'
#
# generated by racc
#
require 'calc3.rex'
class Calculator3 < Racc::Parser
##### racc 1.4.4 generates ###
racc_reduce_table = [
0, 0, :racc_error,
1, 11, :_reduce_none,
0, 11, :_reduce_2,
3, 12, :_reduce_3,
3, 12, :_reduce_4,
3, 12, :_reduce_5,
3, 12, :_reduce_6,
3, 12, :_reduce_7,
2, 12, :_reduce_8,
1, 12, :_reduce_none ]
racc_reduce_n = 10
racc_shift_n = 19
racc_action_table = [
7, 8, 9, 10, 6, 18, 3, 4, 11, 5,
7, 8, 9, 10, 3, 4, 13, 5, 3, 4,
nil, 5, 3, 4, nil, 5, 3, 4, nil, 5,
3, 4, nil, 5, 7, 8, 7, 8 ]
racc_action_check = [
12, 12, 12, 12, 1, 12, 10, 10, 3, 10,
2, 2, 2, 2, 0, 0, 6, 0, 4, 4,
nil, 4, 9, 9, nil, 9, 8, 8, nil, 8,
7, 7, nil, 7, 17, 17, 16, 16 ]
racc_action_pointer = [
8, 4, 7, -1, 12, nil, 16, 24, 20, 16,
0, nil, -3, nil, nil, nil, 33, 31, nil ]
racc_action_default = [
-2, -10, -1, -10, -10, -9, -10, -10, -10, -10,
-10, -8, -10, 19, -5, -6, -3, -4, -7 ]
racc_goto_table = [
2, 1, nil, nil, 12, nil, nil, 14, 15, 16,
17 ]
racc_goto_check = [
2, 1, nil, nil, 2, nil, nil, 2, 2, 2,
2 ]
racc_goto_pointer = [
nil, 1, 0 ]
racc_goto_default = [
nil, nil, nil ]
racc_token_table = {
false => 0,
Object.new => 1,
:UMINUS => 2,
"*" => 3,
"/" => 4,
"+" => 5,
"-" => 6,
"(" => 7,
")" => 8,
:NUMBER => 9 }
racc_use_result_var = false
racc_nt_base = 10
Racc_arg = [
racc_action_table,
racc_action_check,
racc_action_default,
racc_action_pointer,
racc_goto_table,
racc_goto_check,
racc_goto_default,
racc_goto_pointer,
racc_nt_base,
racc_reduce_table,
racc_token_table,
racc_shift_n,
racc_reduce_n,
racc_use_result_var ]
Racc_token_to_s_table = [
'$end',
'error',
'UMINUS',
'"*"',
'"/"',
'"+"',
'"-"',
'"("',
'")"',
'NUMBER',
'$start',
'target',
'exp']
Racc_debug_parser = false
##### racc system variables end #####
# reduce 0 omitted
# reduce 1 omitted
module_eval <<'.,.,', 'calc3.racc', 13
def _reduce_2( val, _values)
0
end
.,.,
module_eval <<'.,.,', 'calc3.racc', 15
def _reduce_3( val, _values)
val[0] + val[2]
end
.,.,
module_eval <<'.,.,', 'calc3.racc', 16
def _reduce_4( val, _values)
val[0] - val[2]
end
.,.,
module_eval <<'.,.,', 'calc3.racc', 17
def _reduce_5( val, _values)
val[0] * val[2]
end
.,.,
module_eval <<'.,.,', 'calc3.racc', 18
def _reduce_6( val, _values)
val[0] / val[2]
end
.,.,
module_eval <<'.,.,', 'calc3.racc', 19
def _reduce_7( val, _values)
val[1]
end
.,.,
module_eval <<'.,.,', 'calc3.racc', 20
def _reduce_8( val, _values)
-(val[1])
end
.,.,
# reduce 9 omitted
def _reduce_none( val, _values)
val[0]
end
end # class Calculator3
puts 'sample calc'
puts '"q" to quit.'
calc = Calculator3.new
while true
print '>>> '; $stdout.flush
str = $stdin.gets.strip
break if /q/i === str
begin
p calc.scan_str(str)
rescue ParseError
puts 'parse error'
end
end
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