Index: icu46/source/i18n/regexcst.pl |
=================================================================== |
--- icu46/source/i18n/regexcst.pl (revision 0) |
+++ icu46/source/i18n/regexcst.pl (revision 0) |
@@ -0,0 +1,328 @@ |
+#!/usr/bin/perl |
+# ******************************************************************** |
+# * COPYRIGHT: |
+# * Copyright (c) 2002-2007, International Business Machines Corporation and |
+# * others. All Rights Reserved. |
+# ******************************************************************** |
+# |
+# regexcst.pl |
+# Compile the regular expression paser state table data into initialized C data. |
+# Usage: |
+# cd icu/source/i18n |
+# perl regexcst.pl < regexcst.txt > regexcst.h |
+# |
+# The output file, regexcst.h, is included by some of the .cpp regex |
+# implementation files. This perl script is NOT run as part |
+# of a normal ICU build. It is run by hand when needed, and the |
+# regexcst.h generated file is put back into cvs. |
+# |
+# See regexcst.txt for a description of the input format for this script. |
+# |
+# This script is derived from rbbicst.pl, which peforms the same function |
+# for the Rule Based Break Iterator Rule Parser. Perhaps they could be |
+# merged? |
+# |
+ |
+ |
+$num_states = 1; # Always the state number for the line being compiled. |
+$line_num = 0; # The line number in the input file. |
+ |
+$states{"pop"} = 255; # Add the "pop" to the list of defined state names. |
+ # This prevents any state from being labelled with "pop", |
+ # and resolves references to "pop" in the next state field. |
+ |
+line_loop: while (<>) { |
+ chomp(); |
+ $line = $_; |
+ @fields = split(); |
+ $line_num++; |
+ |
+ # Remove # comments, which are any fields beginning with a #, plus all |
+ # that follow on the line. |
+ for ($i=0; $i<@fields; $i++) { |
+ if ($fields[$i] =~ /^#/) { |
+ @fields = @fields[0 .. $i-1]; |
+ last; |
+ } |
+ } |
+ # ignore blank lines, and those with no fields left after stripping comments.. |
+ if (@fields == 0) { |
+ next; |
+ } |
+ |
+ # |
+ # State Label: handling. |
+ # Does the first token end with a ":"? If so, it's the name of a state. |
+ # Put in a hash, together with the current state number, |
+ # so that we can later look up the number from the name. |
+ # |
+ if (@fields[0] =~ /.*:$/) { |
+ $state_name = @fields[0]; |
+ $state_name =~ s/://; # strip off the colon from the state name. |
+ |
+ if ($states{$state_name} != 0) { |
+ print " rbbicst: at line $line-num duplicate definition of state $state_name\n"; |
+ } |
+ $states{$state_name} = $num_states; |
+ $stateNames[$num_states] = $state_name; |
+ |
+ # if the label was the only thing on this line, go on to the next line, |
+ # otherwise assume that a state definition is on the same line and fall through. |
+ if (@fields == 1) { |
+ next line_loop; |
+ } |
+ shift @fields; # shift off label field in preparation |
+ # for handling the rest of the line. |
+ } |
+ |
+ # |
+ # State Transition line. |
+ # syntax is this, |
+ # character [n] target-state [^push-state] [function-name] |
+ # where |
+ # [something] is an optional something |
+ # character is either a single quoted character e.g. '[' |
+ # or a name of a character class, e.g. white_space |
+ # |
+ |
+ $state_line_num[$num_states] = $line_num; # remember line number with each state |
+ # so we can make better error messages later. |
+ # |
+ # First field, character class or literal character for this transition. |
+ # |
+ if ($fields[0] =~ /^'.'$/) { |
+ # We've got a quoted literal character. |
+ $state_literal_chars[$num_states] = $fields[0]; |
+ $state_literal_chars[$num_states] =~ s/'//g; |
+ } else { |
+ # We've got the name of a character class. |
+ $state_char_class[$num_states] = $fields[0]; |
+ if ($fields[0] =~ /[\W]/) { |
+ print " rbbicsts: at line $line_num, bad character literal or character class name.\n"; |
+ print " scanning $fields[0]\n"; |
+ exit(-1); |
+ } |
+ } |
+ shift @fields; |
+ |
+ # |
+ # do the 'n' flag |
+ # |
+ $state_flag[$num_states] = "FALSE"; |
+ if ($fields[0] eq "n") { |
+ $state_flag[$num_states] = "TRUE"; |
+ shift @fields; |
+ } |
+ |
+ # |
+ # do the destination state. |
+ # |
+ $state_dest_state[$num_states] = $fields[0]; |
+ if ($fields[0] eq "") { |
+ print " rbbicsts: at line $line_num, destination state missing.\n"; |
+ exit(-1); |
+ } |
+ shift @fields; |
+ |
+ # |
+ # do the push state, if present. |
+ # |
+ if ($fields[0] =~ /^\^/) { |
+ $fields[0] =~ s/^\^//; |
+ $state_push_state[$num_states] = $fields[0]; |
+ if ($fields[0] eq "" ) { |
+ print " rbbicsts: at line $line_num, expected state after ^ (no spaces).\n"; |
+ exit(-1); |
+ } |
+ shift @fields; |
+ } |
+ |
+ # |
+ # Lastly, do the optional action name. |
+ # |
+ if ($fields[0] ne "") { |
+ $state_func_name[$num_states] = $fields[0]; |
+ shift @fields; |
+ } |
+ |
+ # |
+ # There should be no fields left on the line at this point. |
+ # |
+ if (@fields > 0) { |
+ print " rbbicsts: at line $line_num, unexpected extra stuff on input line.\n"; |
+ print " scanning $fields[0]\n"; |
+ } |
+ $num_states++; |
+} |
+ |
+# |
+# We've read in the whole file, now go back and output the |
+# C source code for the state transition table. |
+# |
+# We read all states first, before writing anything, so that the state numbers |
+# for the destination states are all available to be written. |
+# |
+ |
+# |
+# Make hashes for the names of the character classes and |
+# for the names of the actions that appeared. |
+# |
+for ($state=1; $state < $num_states; $state++) { |
+ if ($state_char_class[$state] ne "") { |
+ if ($charClasses{$state_char_class[$state]} == 0) { |
+ $charClasses{$state_char_class[$state]} = 1; |
+ } |
+ } |
+ if ($state_func_name[$state] eq "") { |
+ $state_func_name[$state] = "doNOP"; |
+ } |
+ if ($actions{$state_action_name[$state]} == 0) { |
+ $actions{$state_func_name[$state]} = 1; |
+ } |
+} |
+ |
+# |
+# Check that all of the destination states have been defined |
+# |
+# |
+$states{"exit"} = 0; # Predefined state name, terminates state machine. |
+for ($state=1; $state<$num_states; $state++) { |
+ if ($states{$state_dest_state[$state]} == 0 && $state_dest_state[$state] ne "exit") { |
+ print "Error at line $state_line_num[$state]: target state \"$state_dest_state[$state]\" is not defined.\n"; |
+ $errors++; |
+ } |
+ if ($state_push_state[$state] ne "" && $states{$state_push_state[$state]} == 0) { |
+ print "Error at line $state_line_num[$state]: target state \"$state_push_state[$state]\" is not defined.\n"; |
+ $errors++; |
+ } |
+} |
+ |
+die if ($errors>0); |
+ |
+print "//---------------------------------------------------------------------------------\n"; |
+print "//\n"; |
+print "// Generated Header File. Do not edit by hand.\n"; |
+print "// This file contains the state table for the ICU Regular Expression Pattern Parser\n"; |
+print "// It is generated by the Perl script \"regexcst.pl\" from\n"; |
+print "// the rule parser state definitions file \"regexcst.txt\".\n"; |
+print "//\n"; |
+print "// Copyright (C) 2002-2007 International Business Machines Corporation \n"; |
+print "// and others. All rights reserved. \n"; |
+print "//\n"; |
+print "//---------------------------------------------------------------------------------\n"; |
+print "#ifndef RBBIRPT_H\n"; |
+print "#define RBBIRPT_H\n"; |
+print "\n"; |
+print "U_NAMESPACE_BEGIN\n"; |
+ |
+# |
+# Emit the constants for indicies of Unicode Sets |
+# Define one constant for each of the character classes encountered. |
+# At the same time, store the index corresponding to the set name back into hash. |
+# |
+print "//\n"; |
+print "// Character classes for regex pattern scanning.\n"; |
+print "//\n"; |
+$i = 128; # State Table values for Unicode char sets range from 128-250. |
+ # Sets "default", "quoted", etc. get special handling. |
+ # They have no corresponding UnicodeSet object in the state machine, |
+ # but are handled by special case code. So we emit no reference |
+ # to a UnicodeSet object to them here. |
+foreach $setName (keys %charClasses) { |
+ if ($setName eq "default") { |
+ $charClasses{$setName} = 255;} |
+ elsif ($setName eq "quoted") { |
+ $charClasses{$setName} = 254;} |
+ elsif ($setName eq "eof") { |
+ $charClasses{$setName} = 253;} |
+ else { |
+ # Normal character class. Fill in array with a ptr to the corresponding UnicodeSet in the state machine. |
+ print " static const uint8_t kRuleSet_$setName = $i;\n"; |
+ $charClasses{$setName} = $i; |
+ $i++; |
+ } |
+} |
+print "\n\n"; |
+ |
+# |
+# Emit the enum for the actions to be performed. |
+# |
+print "enum Regex_PatternParseAction {\n"; |
+foreach $act (keys %actions) { |
+ print " $act,\n"; |
+} |
+print " rbbiLastAction};\n\n"; |
+ |
+# |
+# Emit the struct definition for transtion table elements. |
+# |
+print "//-------------------------------------------------------------------------------\n"; |
+print "//\n"; |
+print "// RegexTableEl represents the structure of a row in the transition table\n"; |
+print "// for the pattern parser state machine.\n"; |
+print "//-------------------------------------------------------------------------------\n"; |
+print "struct RegexTableEl {\n"; |
+print " Regex_PatternParseAction fAction;\n"; |
+print " uint8_t fCharClass; // 0-127: an individual ASCII character\n"; |
+print " // 128-255: character class index\n"; |
+print " uint8_t fNextState; // 0-250: normal next-state numbers\n"; |
+print " // 255: pop next-state from stack.\n"; |
+print " uint8_t fPushState;\n"; |
+print " UBool fNextChar;\n"; |
+print "};\n\n"; |
+ |
+# |
+# emit the state transition table |
+# |
+print "static const struct RegexTableEl gRuleParseStateTable[] = {\n"; |
+print " {doNOP, 0, 0, 0, TRUE}\n"; # State 0 is a dummy. Real states start with index = 1. |
+for ($state=1; $state < $num_states; $state++) { |
+ print " , {$state_func_name[$state],"; |
+ if ($state_literal_chars[$state] ne "") { |
+ $c = $state_literal_chars[$state]; |
+ printf(" %d /* $c */,", ord($c)); # use numeric value, so EBCDIC machines are ok. |
+ }else { |
+ print " $charClasses{$state_char_class[$state]},"; |
+ } |
+ print " $states{$state_dest_state[$state]},"; |
+ |
+ # The push-state field is optional. If omitted, fill field with a zero, which flags |
+ # the state machine that there is no push state. |
+ if ($state_push_state[$state] eq "") { |
+ print "0, "; |
+ } else { |
+ print " $states{$state_push_state[$state]},"; |
+ } |
+ print " $state_flag[$state]} "; |
+ |
+ # Put out a C++ comment showing the number (index) of this state row, |
+ # and, if this is the first row of the table for this state, the state name. |
+ print " // $state "; |
+ if ($stateNames[$state] ne "") { |
+ print " $stateNames[$state]"; |
+ } |
+ print "\n"; |
+}; |
+print " };\n"; |
+ |
+ |
+# |
+# emit a mapping array from state numbers to state names. |
+# |
+# This array is used for producing debugging output from the pattern parser. |
+# |
+print "static const char * const RegexStateNames[] = {"; |
+for ($state=0; $state<$num_states; $state++) { |
+ if ($stateNames[$state] ne "") { |
+ print " \"$stateNames[$state]\",\n"; |
+ } else { |
+ print " 0,\n"; |
+ } |
+} |
+print " 0};\n\n"; |
+ |
+print "U_NAMESPACE_END\n"; |
+print "#endif\n"; |
+ |
+ |
+ |
Property changes on: icu46/source/i18n/regexcst.pl |
___________________________________________________________________ |
Added: svn:executable |
+ * |
Added: svn:eol-style |
+ LF |