The Tor Browser: intl/icu/source/i18n/regexcst.pl@6474c204b198 (annotated)

intl/icu/source/i18n/regexcst.pl@6474c204b198 (annotated)

intl/icu/source/i18n/regexcst.pl

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rwxr-xr-x

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 #!/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";

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intl/icu/source/i18n/regexcst.pl@6474c204b198 (annotated)

intl/icu/source/i18n/regexcst.pl