From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start
---
jni/ruby/lib/racc/parser.rb | 622 +++++++++++++++++++++++++++++++++
jni/ruby/lib/racc/rdoc/grammar.en.rdoc | 219 ++++++++++++
2 files changed, 841 insertions(+)
create mode 100644 jni/ruby/lib/racc/parser.rb
create mode 100644 jni/ruby/lib/racc/rdoc/grammar.en.rdoc
(limited to 'jni/ruby/lib/racc')
diff --git a/jni/ruby/lib/racc/parser.rb b/jni/ruby/lib/racc/parser.rb
new file mode 100644
index 0000000..f811ab6
--- /dev/null
+++ b/jni/ruby/lib/racc/parser.rb
@@ -0,0 +1,622 @@
+#--
+# $originalId: parser.rb,v 1.8 2006/07/06 11:42:07 aamine Exp $
+#
+# Copyright (c) 1999-2006 Minero Aoki
+#
+# This program is free software.
+# You can distribute/modify this program under the same terms of ruby.
+#
+# As a special exception, when this code is copied by Racc
+# into a Racc output file, you may use that output file
+# without restriction.
+#++
+
+module Racc
+ class ParseError < StandardError; end
+end
+unless defined?(::ParseError)
+ ParseError = Racc::ParseError
+end
+
+# Racc is a LALR(1) parser generator.
+# It is written in Ruby itself, and generates Ruby programs.
+#
+# == Command-line Reference
+#
+# racc [-o<var>filename</var>] [--output-file=<var>filename</var>]
+# [-e<var>rubypath</var>] [--embedded=<var>rubypath</var>]
+# [-v] [--verbose]
+# [-O<var>filename</var>] [--log-file=<var>filename</var>]
+# [-g] [--debug]
+# [-E] [--embedded]
+# [-l] [--no-line-convert]
+# [-c] [--line-convert-all]
+# [-a] [--no-omit-actions]
+# [-C] [--check-only]
+# [-S] [--output-status]
+# [--version] [--copyright] [--help] <var>grammarfile</var>
+#
+# [+filename+]
+# Racc grammar file. Any extension is permitted.
+# [-o+outfile+, --output-file=+outfile+]
+# A filename for output. default is <+filename+>.tab.rb
+# [-O+filename+, --log-file=+filename+]
+# Place logging output in file +filename+.
+# Default log file name is <+filename+>.output.
+# [-e+rubypath+, --executable=+rubypath+]
+# output executable file(mode 755). where +path+ is the Ruby interpreter.
+# [-v, --verbose]
+# verbose mode. create +filename+.output file, like yacc's y.output file.
+# [-g, --debug]
+# add debug code to parser class. To display debugging information,
+# use this '-g' option and set @yydebug true in parser class.
+# [-E, --embedded]
+# Output parser which doesn't need runtime files (racc/parser.rb).
+# [-C, --check-only]
+# Check syntax of racc grammar file and quit.
+# [-S, --output-status]
+# Print messages time to time while compiling.
+# [-l, --no-line-convert]
+# turns off line number converting.
+# [-c, --line-convert-all]
+# Convert line number of actions, inner, header and footer.
+# [-a, --no-omit-actions]
+# Call all actions, even if an action is empty.
+# [--version]
+# print Racc version and quit.
+# [--copyright]
+# Print copyright and quit.
+# [--help]
+# Print usage and quit.
+#
+# == Generating Parser Using Racc
+#
+# To compile Racc grammar file, simply type:
+#
+# $ racc parse.y
+#
+# This creates Ruby script file "parse.tab.y". The -o option can change the output filename.
+#
+# == Writing A Racc Grammar File
+#
+# If you want your own parser, you have to write a grammar file.
+# A grammar file contains the name of your parser class, grammar for the parser,
+# user code, and anything else.
+# When writing a grammar file, yacc's knowledge is helpful.
+# If you have not used yacc before, Racc is not too difficult.
+#
+# Here's an example Racc grammar file.
+#
+# class Calcparser
+# rule
+# target: exp { print val[0] }
+#
+# exp: exp '+' exp
+# | exp '*' exp
+# | '(' exp ')'
+# | NUMBER
+# end
+#
+# Racc grammar files resemble yacc files.
+# But (of course), this is Ruby code.
+# yacc's $$ is the 'result', $0, $1... is
+# an array called 'val', and $-1, $-2... is an array called '_values'.
+#
+# See the {Grammar File Reference}[rdoc-ref:lib/racc/rdoc/grammar.en.rdoc] for
+# more information on grammar files.
+#
+# == Parser
+#
+# Then you must prepare the parse entry method. There are two types of
+# parse methods in Racc, Racc::Parser#do_parse and Racc::Parser#yyparse
+#
+# Racc::Parser#do_parse is simple.
+#
+# It's yyparse() of yacc, and Racc::Parser#next_token is yylex().
+# This method must returns an array like [TOKENSYMBOL, ITS_VALUE].
+# EOF is [false, false].
+# (TOKENSYMBOL is a Ruby symbol (taken from String#intern) by default.
+# If you want to change this, see the grammar reference.
+#
+# Racc::Parser#yyparse is little complicated, but useful.
+# It does not use Racc::Parser#next_token, instead it gets tokens from any iterator.
+#
+# For example, <code>yyparse(obj, :scan)</code> causes
+# calling +obj#scan+, and you can return tokens by yielding them from +obj#scan+.
+#
+# == Debugging
+#
+# When debugging, "-v" or/and the "-g" option is helpful.
+#
+# "-v" creates verbose log file (.output).
+# "-g" creates a "Verbose Parser".
+# Verbose Parser prints the internal status when parsing.
+# But it's _not_ automatic.
+# You must use -g option and set +@yydebug+ to +true+ in order to get output.
+# -g option only creates the verbose parser.
+#
+# === Racc reported syntax error.
+#
+# Isn't there too many "end"?
+# grammar of racc file is changed in v0.10.
+#
+# Racc does not use '%' mark, while yacc uses huge number of '%' marks..
+#
+# === Racc reported "XXXX conflicts".
+#
+# Try "racc -v xxxx.y".
+# It causes producing racc's internal log file, xxxx.output.
+#
+# === Generated parsers does not work correctly
+#
+# Try "racc -g xxxx.y".
+# This command let racc generate "debugging parser".
+# Then set @yydebug=true in your parser.
+# It produces a working log of your parser.
+#
+# == Re-distributing Racc runtime
+#
+# A parser, which is created by Racc, requires the Racc runtime module;
+# racc/parser.rb.
+#
+# Ruby 1.8.x comes with Racc runtime module,
+# you need NOT distribute Racc runtime files.
+#
+# If you want to include the Racc runtime module with your parser.
+# This can be done by using '-E' option:
+#
+# $ racc -E -omyparser.rb myparser.y
+#
+# This command creates myparser.rb which `includes' Racc runtime.
+# Only you must do is to distribute your parser file (myparser.rb).
+#
+# Note: parser.rb is LGPL, but your parser is not.
+# Your own parser is completely yours.
+module Racc
+
+ unless defined?(Racc_No_Extensions)
+ Racc_No_Extensions = false # :nodoc:
+ end
+
+ class Parser
+
+ Racc_Runtime_Version = '1.4.6'
+ Racc_Runtime_Revision = %w$originalRevision: 1.8 $[1]
+
+ Racc_Runtime_Core_Version_R = '1.4.6'
+ Racc_Runtime_Core_Revision_R = %w$originalRevision: 1.8 $[1]
+ begin
+ require 'racc/cparse'
+ # Racc_Runtime_Core_Version_C = (defined in extension)
+ Racc_Runtime_Core_Revision_C = Racc_Runtime_Core_Id_C.split[2]
+ unless new.respond_to?(:_racc_do_parse_c, true)
+ raise LoadError, 'old cparse.so'
+ end
+ if Racc_No_Extensions
+ raise LoadError, 'selecting ruby version of racc runtime core'
+ end
+
+ Racc_Main_Parsing_Routine = :_racc_do_parse_c # :nodoc:
+ Racc_YY_Parse_Method = :_racc_yyparse_c # :nodoc:
+ Racc_Runtime_Core_Version = Racc_Runtime_Core_Version_C # :nodoc:
+ Racc_Runtime_Core_Revision = Racc_Runtime_Core_Revision_C # :nodoc:
+ Racc_Runtime_Type = 'c' # :nodoc:
+ rescue LoadError
+ Racc_Main_Parsing_Routine = :_racc_do_parse_rb
+ Racc_YY_Parse_Method = :_racc_yyparse_rb
+ Racc_Runtime_Core_Version = Racc_Runtime_Core_Version_R
+ Racc_Runtime_Core_Revision = Racc_Runtime_Core_Revision_R
+ Racc_Runtime_Type = 'ruby'
+ end
+
+ def Parser.racc_runtime_type # :nodoc:
+ Racc_Runtime_Type
+ end
+
+ def _racc_setup
+ @yydebug = false unless self.class::Racc_debug_parser
+ @yydebug = false unless defined?(@yydebug)
+ if @yydebug
+ @racc_debug_out = $stderr unless defined?(@racc_debug_out)
+ @racc_debug_out ||= $stderr
+ end
+ arg = self.class::Racc_arg
+ arg[13] = true if arg.size < 14
+ arg
+ end
+
+ def _racc_init_sysvars
+ @racc_state = [0]
+ @racc_tstack = []
+ @racc_vstack = []
+
+ @racc_t = nil
+ @racc_val = nil
+
+ @racc_read_next = true
+
+ @racc_user_yyerror = false
+ @racc_error_status = 0
+ end
+
+ # The entry point of the parser. This method is used with #next_token.
+ # If Racc wants to get token (and its value), calls next_token.
+ #
+ # Example:
+ # def parse
+ # @q = [[1,1],
+ # [2,2],
+ # [3,3],
+ # [false, '$']]
+ # do_parse
+ # end
+ #
+ # def next_token
+ # @q.shift
+ # end
+ def do_parse
+ __send__(Racc_Main_Parsing_Routine, _racc_setup(), false)
+ end
+
+ # The method to fetch next token.
+ # If you use #do_parse method, you must implement #next_token.
+ #
+ # The format of return value is [TOKEN_SYMBOL, VALUE].
+ # +token-symbol+ is represented by Ruby's symbol by default, e.g. :IDENT
+ # for 'IDENT'. ";" (String) for ';'.
+ #
+ # The final symbol (End of file) must be false.
+ def next_token
+ raise NotImplementedError, "#{self.class}\#next_token is not defined"
+ end
+
+ def _racc_do_parse_rb(arg, in_debug)
+ action_table, action_check, action_default, action_pointer,
+ _, _, _, _,
+ _, _, token_table, _,
+ _, _, * = arg
+
+ _racc_init_sysvars
+ tok = act = i = nil
+
+ catch(:racc_end_parse) {
+ while true
+ if i = action_pointer[@racc_state[-1]]
+ if @racc_read_next
+ if @racc_t != 0 # not EOF
+ tok, @racc_val = next_token()
+ unless tok # EOF
+ @racc_t = 0
+ else
+ @racc_t = (token_table[tok] or 1) # error token
+ end
+ racc_read_token(@racc_t, tok, @racc_val) if @yydebug
+ @racc_read_next = false
+ end
+ end
+ i += @racc_t
+ unless i >= 0 and
+ act = action_table[i] and
+ action_check[i] == @racc_state[-1]
+ act = action_default[@racc_state[-1]]
+ end
+ else
+ act = action_default[@racc_state[-1]]
+ end
+ while act = _racc_evalact(act, arg)
+ ;
+ end
+ end
+ }
+ end
+
+ # Another entry point for the parser.
+ # If you use this method, you must implement RECEIVER#METHOD_ID method.
+ #
+ # RECEIVER#METHOD_ID is a method to get next token.
+ # It must 'yield' the token, which format is [TOKEN-SYMBOL, VALUE].
+ def yyparse(recv, mid)
+ __send__(Racc_YY_Parse_Method, recv, mid, _racc_setup(), true)
+ end
+
+ def _racc_yyparse_rb(recv, mid, arg, c_debug)
+ action_table, action_check, action_default, action_pointer,
+ _, _, _, _,
+ _, _, token_table, _,
+ _, _, * = arg
+
+ _racc_init_sysvars
+ act = nil
+ i = nil
+
+ catch(:racc_end_parse) {
+ until i = action_pointer[@racc_state[-1]]
+ while act = _racc_evalact(action_default[@racc_state[-1]], arg)
+ ;
+ end
+ end
+ recv.__send__(mid) do |tok, val|
+ unless tok
+ @racc_t = 0
+ else
+ @racc_t = (token_table[tok] or 1) # error token
+ end
+ @racc_val = val
+ @racc_read_next = false
+
+ i += @racc_t
+ unless i >= 0 and
+ act = action_table[i] and
+ action_check[i] == @racc_state[-1]
+ act = action_default[@racc_state[-1]]
+ end
+ while act = _racc_evalact(act, arg)
+ ;
+ end
+
+ while not(i = action_pointer[@racc_state[-1]]) or
+ not @racc_read_next or
+ @racc_t == 0 # $
+ unless i and i += @racc_t and
+ i >= 0 and
+ act = action_table[i] and
+ action_check[i] == @racc_state[-1]
+ act = action_default[@racc_state[-1]]
+ end
+ while act = _racc_evalact(act, arg)
+ ;
+ end
+ end
+ end
+ }
+ end
+
+ ###
+ ### common
+ ###
+
+ def _racc_evalact(act, arg)
+ action_table, action_check, _, action_pointer,
+ _, _, _, _,
+ _, _, _, shift_n, reduce_n,
+ _, _, * = arg
+
+ if act > 0 and act < shift_n
+ #
+ # shift
+ #
+ if @racc_error_status > 0
+ @racc_error_status -= 1 unless @racc_t == 1 # error token
+ end
+ @racc_vstack.push @racc_val
+ @racc_state.push act
+ @racc_read_next = true
+ if @yydebug
+ @racc_tstack.push @racc_t
+ racc_shift @racc_t, @racc_tstack, @racc_vstack
+ end
+
+ elsif act < 0 and act > -reduce_n
+ #
+ # reduce
+ #
+ code = catch(:racc_jump) {
+ @racc_state.push _racc_do_reduce(arg, act)
+ false
+ }
+ if code
+ case code
+ when 1 # yyerror
+ @racc_user_yyerror = true # user_yyerror
+ return -reduce_n
+ when 2 # yyaccept
+ return shift_n
+ else
+ raise '[Racc Bug] unknown jump code'
+ end
+ end
+
+ elsif act == shift_n
+ #
+ # accept
+ #
+ racc_accept if @yydebug
+ throw :racc_end_parse, @racc_vstack[0]
+
+ elsif act == -reduce_n
+ #
+ # error
+ #
+ case @racc_error_status
+ when 0
+ unless arg[21] # user_yyerror
+ on_error @racc_t, @racc_val, @racc_vstack
+ end
+ when 3
+ if @racc_t == 0 # is $
+ throw :racc_end_parse, nil
+ end
+ @racc_read_next = true
+ end
+ @racc_user_yyerror = false
+ @racc_error_status = 3
+ while true
+ if i = action_pointer[@racc_state[-1]]
+ i += 1 # error token
+ if i >= 0 and
+ (act = action_table[i]) and
+ action_check[i] == @racc_state[-1]
+ break
+ end
+ end
+ throw :racc_end_parse, nil if @racc_state.size <= 1
+ @racc_state.pop
+ @racc_vstack.pop
+ if @yydebug
+ @racc_tstack.pop
+ racc_e_pop @racc_state, @racc_tstack, @racc_vstack
+ end
+ end
+ return act
+
+ else
+ raise "[Racc Bug] unknown action #{act.inspect}"
+ end
+
+ racc_next_state(@racc_state[-1], @racc_state) if @yydebug
+
+ nil
+ end
+
+ def _racc_do_reduce(arg, act)
+ _, _, _, _,
+ goto_table, goto_check, goto_default, goto_pointer,
+ nt_base, reduce_table, _, _,
+ _, use_result, * = arg
+ state = @racc_state
+ vstack = @racc_vstack
+ tstack = @racc_tstack
+
+ i = act * -3
+ len = reduce_table[i]
+ reduce_to = reduce_table[i+1]
+ method_id = reduce_table[i+2]
+ void_array = []
+
+ tmp_t = tstack[-len, len] if @yydebug
+ tmp_v = vstack[-len, len]
+ tstack[-len, len] = void_array if @yydebug
+ vstack[-len, len] = void_array
+ state[-len, len] = void_array
+
+ # tstack must be updated AFTER method call
+ if use_result
+ vstack.push __send__(method_id, tmp_v, vstack, tmp_v[0])
+ else
+ vstack.push __send__(method_id, tmp_v, vstack)
+ end
+ tstack.push reduce_to
+
+ racc_reduce(tmp_t, reduce_to, tstack, vstack) if @yydebug
+
+ k1 = reduce_to - nt_base
+ if i = goto_pointer[k1]
+ i += state[-1]
+ if i >= 0 and (curstate = goto_table[i]) and goto_check[i] == k1
+ return curstate
+ end
+ end
+ goto_default[k1]
+ end
+
+ # This method is called when a parse error is found.
+ #
+ # ERROR_TOKEN_ID is an internal ID of token which caused error.
+ # You can get string representation of this ID by calling
+ # #token_to_str.
+ #
+ # ERROR_VALUE is a value of error token.
+ #
+ # value_stack is a stack of symbol values.
+ # DO NOT MODIFY this object.
+ #
+ # This method raises ParseError by default.
+ #
+ # If this method returns, parsers enter "error recovering mode".
+ def on_error(t, val, vstack)
+ raise ParseError, sprintf("\nparse error on value %s (%s)",
+ val.inspect, token_to_str(t) || '?')
+ end
+
+ # Enter error recovering mode.
+ # This method does not call #on_error.
+ def yyerror
+ throw :racc_jump, 1
+ end
+
+ # Exit parser.
+ # Return value is Symbol_Value_Stack[0].
+ def yyaccept
+ throw :racc_jump, 2
+ end
+
+ # Leave error recovering mode.
+ def yyerrok
+ @racc_error_status = 0
+ end
+
+ # For debugging output
+ def racc_read_token(t, tok, val)
+ @racc_debug_out.print 'read '
+ @racc_debug_out.print tok.inspect, '(', racc_token2str(t), ') '
+ @racc_debug_out.puts val.inspect
+ @racc_debug_out.puts
+ end
+
+ def racc_shift(tok, tstack, vstack)
+ @racc_debug_out.puts "shift #{racc_token2str tok}"
+ racc_print_stacks tstack, vstack
+ @racc_debug_out.puts
+ end
+
+ def racc_reduce(toks, sim, tstack, vstack)
+ out = @racc_debug_out
+ out.print 'reduce '
+ if toks.empty?
+ out.print ' <none>'
+ else
+ toks.each {|t| out.print ' ', racc_token2str(t) }
+ end
+ out.puts " --> #{racc_token2str(sim)}"
+
+ racc_print_stacks tstack, vstack
+ @racc_debug_out.puts
+ end
+
+ def racc_accept
+ @racc_debug_out.puts 'accept'
+ @racc_debug_out.puts
+ end
+
+ def racc_e_pop(state, tstack, vstack)
+ @racc_debug_out.puts 'error recovering mode: pop token'
+ racc_print_states state
+ racc_print_stacks tstack, vstack
+ @racc_debug_out.puts
+ end
+
+ def racc_next_state(curstate, state)
+ @racc_debug_out.puts "goto #{curstate}"
+ racc_print_states state
+ @racc_debug_out.puts
+ end
+
+ def racc_print_stacks(t, v)
+ out = @racc_debug_out
+ out.print ' ['
+ t.each_index do |i|
+ out.print ' (', racc_token2str(t[i]), ' ', v[i].inspect, ')'
+ end
+ out.puts ' ]'
+ end
+
+ def racc_print_states(s)
+ out = @racc_debug_out
+ out.print ' ['
+ s.each {|st| out.print ' ', st }
+ out.puts ' ]'
+ end
+
+ def racc_token2str(tok)
+ self.class::Racc_token_to_s_table[tok] or
+ raise "[Racc Bug] can't convert token #{tok} to string"
+ end
+
+ # Convert internal ID of token symbol to the string.
+ def token_to_str(t)
+ self.class::Racc_token_to_s_table[t]
+ end
+
+ end
+
+end
diff --git a/jni/ruby/lib/racc/rdoc/grammar.en.rdoc b/jni/ruby/lib/racc/rdoc/grammar.en.rdoc
new file mode 100644
index 0000000..a154246
--- /dev/null
+++ b/jni/ruby/lib/racc/rdoc/grammar.en.rdoc
@@ -0,0 +1,219 @@
+= Racc Grammar File Reference
+
+== Global Structure
+
+== Class Block and User Code Block
+
+There are two blocks on toplevel. One is 'class' block, another is 'user code'
+block. 'user code' block MUST be placed after 'class' block.
+
+== Comments
+
+You can insert comments about all places. Two style comments can be used, Ruby style '#.....' and C style '/\*......*\/'.
+
+== Class Block
+
+The class block is formed like this:
+
+ class CLASS_NAME
+ [precedance table]
+ [token declarations]
+ [expected number of S/R conflicts]
+ [options]
+ [semantic value convertion]
+ [start rule]
+ rule
+ GRAMMARS
+
+CLASS_NAME is a name of parser class. This is the name of generating parser
+class.
+
+If CLASS_NAME includes '::', Racc outputs module clause. For example, writing
+"class M::C" causes creating the code bellow:
+
+ module M
+ class C
+ :
+ :
+ end
+ end
+
+== Grammar Block
+
+The grammar block describes grammar which is able to be understood by parser.
+Syntax is:
+
+ (token): (token) (token) (token).... (action)
+
+ (token): (token) (token) (token).... (action)
+ | (token) (token) (token).... (action)
+ | (token) (token) (token).... (action)
+
+(action) is an action which is executed when its (token)s are found.
+(action) is a ruby code block, which is surrounded by braces:
+
+ { print val[0]
+ puts val[1] }
+
+Note that you cannot use '%' string, here document, '%r' regexp in action.
+
+Actions can be omitted. When it is omitted, '' (empty string) is used.
+
+A return value of action is a value of left side value ($$). It is value of
+result, or returned value by `return` statement.
+
+Here is an example of whole grammar block.
+
+ rule
+ goal: definition rules source { result = val }
+
+ definition: /* none */ { result = [] }
+ | definition startdesig { result[0] = val[1] }
+ | definition
+ precrule # this line continues from upper line
+ {
+ result[1] = val[1]
+ }
+
+ startdesig: START TOKEN
+
+You can use the following special local variables in action:
+
+* result ($$)
+
+The value of left-hand side (lhs). A default value is val[0].
+
+* val ($1,$2,$3...)
+
+An array of value of right-hand side (rhs).
+
+* _values (...$-2,$-1,$0)
+
+A stack of values. DO NOT MODIFY this stack unless you know what you are doing.
+
+== Operator Precedence
+
+This function is equal to '%prec' in yacc.
+To designate this block:
+
+ prechigh
+ nonassoc '++'
+ left '*' '/'
+ left '+' '-'
+ right '='
+ preclow
+
+`right` is yacc's %right, `left` is yacc's %left.
+
+`=` + (symbol) means yacc's %prec:
+
+ prechigh
+ nonassoc UMINUS
+ left '*' '/'
+ left '+' '-'
+ preclow
+
+ rule
+ exp: exp '*' exp
+ | exp '-' exp
+ | '-' exp =UMINUS # equals to "%prec UMINUS"
+ :
+ :
+
+== expect
+
+Racc has bison's "expect" directive.
+
+ # Example
+
+ class MyParser
+ rule
+ expect 3
+ :
+ :
+
+This directive declares "expected" number of shift/reduce conflicts. If
+"expected" number is equal to real number of conflicts, Racc does not print
+conflict warning message.
+
+== Declaring Tokens
+
+By declaring tokens, you can avoid many meaningless bugs. If declared token
+does not exist or existing token does not decleared, Racc output warnings.
+Declaration syntax is:
+
+ token TOKEN_NAME AND_IS_THIS
+ ALSO_THIS_IS AGAIN_AND_AGAIN THIS_IS_LAST
+
+== Options
+
+You can write options for Racc command in your Racc file.
+
+ options OPTION OPTION ...
+
+Options are:
+
+* omit_action_call
+
+omits empty action call or not.
+
+* result_var
+
+uses local variable "result" or not.
+
+You can use 'no_' prefix to invert their meanings.
+
+== Converting Token Symbol
+
+Token symbols are, as default,
+
+ * naked token string in Racc file (TOK, XFILE, this_is_token, ...)
+ --> symbol (:TOK, :XFILE, :this_is_token, ...)
+ * quoted string (':', '.', '(', ...)
+ --> same string (':', '.', '(', ...)
+
+You can change this default by "convert" block.
+Here is an example:
+
+ convert
+ PLUS 'PlusClass' # We use PlusClass for symbol of `PLUS'
+ MIN 'MinusClass' # We use MinusClass for symbol of `MIN'
+ end
+
+We can use almost all ruby value can be used by token symbol,
+except 'false' and 'nil'. These cause unexpected parse error.
+
+If you want to use String as token symbol, special care is required.
+For example:
+
+ convert
+ class '"cls"' # in code, "cls"
+ PLUS '"plus\n"' # in code, "plus\n"
+ MIN "\"minus#{val}\"" # in code, \"minus#{val}\"
+ end
+
+== Start Rule
+
+'%start' in yacc. This changes start rule.
+
+ start real_target
+
+== User Code Block
+
+"User Code Block" is a Ruby source code which is copied to output. There are
+three user code blocks, "header" "inner" and "footer".
+
+Format of user code is like this:
+
+ ---- header
+ ruby statement
+ ruby statement
+ ruby statement
+
+ ---- inner
+ ruby statement
+ :
+ :
+
+If four '-' exist on line head, Racc treat it as beginning of user code block.
+The name of user code block must be one word.
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