reactos/lib/3rdparty/freetype/src/tools/afblue.pl

   1 #! /usr/bin/perl -w
   2 # -*- Perl -*-
   3 #
   4 # afblue.pl
   5 #
   6 # Process a blue zone character data file.
   7 #
   8 # Copyright 2013, 2014 by
   9 # David Turner, Robert Wilhelm, and Werner Lemberg.
  10 #
  11 # This file is part of the FreeType project, and may only be used,
  12 # modified, and distributed under the terms of the FreeType project
  13 # license, LICENSE.TXT.  By continuing to use, modify, or distribute
  14 # this file you indicate that you have read the license and
  15 # understand and accept it fully.
  16
  17 use strict;
  18 use warnings;
  19 use English '-no_match_vars';
  20 use open ':std', ':encoding(UTF-8)';
  21
  22
  23 my $prog = $PROGRAM_NAME;
  24 $prog =~ s| .* / ||x;      # Remove path.
  25
  26 die "usage: $prog datafile < infile > outfile\n" if $#ARGV != 0;
  27
  28
  29 my $datafile = $ARGV[0];
  30
  31 my %diversions;        # The extracted and massaged data from `datafile'.
  32 my @else_stack;        # Booleans to track else-clauses.
  33 my @name_stack;        # Stack of integers used for names of aux. variables.
  34
  35 my $curr_enum;         # Name of the current enumeration.
  36 my $curr_array;        # Name of the current array.
  37 my $curr_max;          # Name of the current maximum value.
  38
  39 my $curr_enum_element; # Name of the current enumeration element.
  40 my $curr_offset;       # The offset relative to current aux. variable.
  41 my $curr_elem_size;    # The size of the current string or block.
  42
  43 my $have_sections = 0; # Boolean; set if start of a section has been seen.
  44 my $have_strings;      # Boolean; set if current section contains strings.
  45 my $have_blocks;       # Boolean; set if current section contains blocks.
  46
  47 my $have_enum_element; # Boolean; set if we have an enumeration element.
  48 my $in_string;         # Boolean; set if a string has been parsed.
  49
  50 my $num_sections = 0;  # Number of sections seen so far.
  51
  52 my $last_aux;          # Name of last auxiliary variable.
  53
  54
  55 # Regular expressions.
  56
  57 # [<ws>] <enum_name> <ws> <array_name> <ws> <max_name> [<ws>] ':' [<ws>] '\n'
  58 my $section_re = qr/ ^ \s* (\S+) \s+ (\S+) \s+ (\S+) \s* : \s* $ /x;
  59
  60 # [<ws>] <enum_element_name> [<ws>] '\n'
  61 my $enum_element_re = qr/ ^ \s* ( [A-Za-z0-9_]+ ) \s* $ /x;
  62
  63 # '#' <preprocessor directive> '\n'
  64 my $preprocessor_re = qr/ ^ \# /x;
  65
  66 # [<ws>] '/' '/' <comment> '\n'
  67 my $comment_re = qr| ^ \s* // |x;
  68
  69 # empty line
  70 my $whitespace_only_re = qr/ ^ \s* $ /x;
  71
  72 # [<ws>] '"' <string> '"' [<ws>] '\n'  (<string> doesn't contain newlines)
  73 my $string_re = qr/ ^ \s*
  74                        " ( (?> (?: (?> [^"\\]+ ) | \\. )* ) ) "
  75                        \s* $ /x;
  76
  77 # [<ws>] '{' <block> '}' [<ws>] '\n'  (<block> can contain newlines)
  78 my $block_start_re = qr/ ^ \s* \{ /x;
  79
  80 # We need the capturing group for `split' to make it return the separator
  81 # tokens (i.e., the opening and closing brace) also.
  82 my $brace_re = qr/ ( [{}] ) /x;
  83
  84
  85 sub Warn
  86 {
  87   my $message = shift;
  88   warn "$datafile:$INPUT_LINE_NUMBER: warning: $message\n";
  89 }
  90
  91
  92 sub Die
  93 {
  94   my $message = shift;
  95   die "$datafile:$INPUT_LINE_NUMBER: error: $message\n";
  96 }
  97
  98
  99 my $warned_before = 0;
 100
 101 sub warn_before
 102 {
 103   Warn("data before first section gets ignored") unless $warned_before;
 104   $warned_before = 1;
 105 }
 106
 107
 108 sub strip_newline
 109 {
 110   chomp;
 111   s/ \x0D $ //x;
 112 }
 113
 114
 115 sub end_curr_string
 116 {
 117   # Append final null byte to string.
 118   if ($have_strings)
 119   {
 120     push @{$diversions{$curr_array}}, "    '\\0',\n" if $in_string;
 121
 122     $curr_offset++;
 123     $in_string = 0;
 124   }
 125 }
 126
 127
 128 sub update_max_elem_size
 129 {
 130   if ($curr_elem_size)
 131   {
 132     my $max = pop @{$diversions{$curr_max}};
 133     $max = $curr_elem_size if $curr_elem_size > $max;
 134     push @{$diversions{$curr_max}}, $max;
 135   }
 136 }
 137
 138
 139 sub convert_non_ascii_char
 140 {
 141   # A UTF-8 character outside of the printable ASCII range, with possibly a
 142   # leading backslash character.
 143   my $s = shift;
 144
 145   # Here we count characters, not bytes.
 146   $curr_elem_size += length $s;
 147
 148   utf8::encode($s);
 149   $s = uc unpack 'H*', $s;
 150
 151   $curr_offset += $s =~ s/\G(..)/'\\x$1', /sg;
 152
 153   return $s;
 154 }
 155
 156
 157 sub convert_ascii_chars
 158 {
 159   # A series of ASCII characters in the printable range.
 160   my $s = shift;
 161
 162   # We ignore spaces.
 163   $s =~ s/ //g;
 164
 165   my $count = $s =~ s/\G(.)/'$1', /g;
 166   $curr_offset += $count;
 167   $curr_elem_size += $count;
 168
 169   return $s;
 170 }
 171
 172
 173 sub convert_literal
 174 {
 175   my $s = shift;
 176   my $orig = $s;
 177
 178   # ASCII printables and space
 179   my $safe_re = '\x20-\x7E';
 180   # ASCII printables and space, no backslash
 181   my $safe_no_backslash_re = '\x20-\x5B\x5D-\x7E';
 182
 183   $s =~ s{
 184            (?: \\? ( [^$safe_re] )
 185                | ( (?: [$safe_no_backslash_re]
 186                        | \\ [$safe_re] )+ ) )
 187          }
 188          {
 189            defined($1) ? convert_non_ascii_char($1)
 190                        : convert_ascii_chars($2)
 191          }egx;
 192
 193    # We assume that `$orig' doesn't contain `*/'
 194    return $s . " /* $orig */";
 195 }
 196
 197
 198 sub aux_name
 199 {
 200   return "af_blue_" . $num_sections. "_" . join('_', @name_stack);
 201 }
 202
 203
 204 sub aux_name_next
 205 {
 206   $name_stack[$#name_stack]++;
 207   my $name = aux_name();
 208   $name_stack[$#name_stack]--;
 209
 210   return $name;
 211 }
 212
 213
 214 sub enum_val_string
 215 {
 216   # Build string that holds code to save the current offset in an
 217   # enumeration element.
 218   my $aux = shift;
 219
 220   my $add = ($last_aux eq "af_blue_" . $num_sections . "_0" )
 221               ? ""
 222               : "$last_aux + ";
 223
 224   return "    $aux = $add$curr_offset,\n";
 225 }
 226
 227
 228
 229 # Process data file.
 230
 231 open(DATA, $datafile) || die "$prog: can't open \`$datafile': $OS_ERROR\n";
 232
 233 while (<DATA>)
 234 {
 235   strip_newline();
 236
 237   next if /$comment_re/;
 238   next if /$whitespace_only_re/;
 239
 240   if (/$section_re/)
 241   {
 242     Warn("previous section is empty") if ($have_sections
 243                                           && !$have_strings
 244                                           && !$have_blocks);
 245
 246     end_curr_string();
 247     update_max_elem_size();
 248
 249     # Save captured groups from `section_re'.
 250     $curr_enum = $1;
 251     $curr_array = $2;
 252     $curr_max = $3;
 253
 254     $curr_enum_element = "";
 255     $curr_offset = 0;
 256
 257     Warn("overwriting already defined enumeration \`$curr_enum'")
 258       if exists($diversions{$curr_enum});
 259     Warn("overwriting already defined array \`$curr_array'")
 260       if exists($diversions{$curr_array});
 261     Warn("overwriting already defined maximum value \`$curr_max'")
 262       if exists($diversions{$curr_max});
 263
 264     $diversions{$curr_enum} = [];
 265     $diversions{$curr_array} = [];
 266     $diversions{$curr_max} = [];
 267
 268     push @{$diversions{$curr_max}}, 0;
 269
 270     @name_stack = ();
 271     push @name_stack, 0;
 272
 273     $have_sections = 1;
 274     $have_strings = 0;
 275     $have_blocks = 0;
 276
 277     $have_enum_element = 0;
 278     $in_string = 0;
 279
 280     $num_sections++;
 281     $curr_elem_size = 0;
 282
 283     $last_aux = aux_name();
 284
 285     next;
 286   }
 287
 288   if (/$preprocessor_re/)
 289   {
 290     if ($have_sections)
 291     {
 292       # Having preprocessor conditionals complicates the computation of
 293       # correct offset values.  We have to introduce auxiliary enumeration
 294       # elements with the name `af_blue_<s>_<n1>_<n2>_...' that store
 295       # offsets to be used in conditional clauses.  `<s>' is the number of
 296       # sections seen so far, `<n1>' is the number of `#if' and `#endif'
 297       # conditionals seen so far in the topmost level, `<n2>' the number of
 298       # `#if' and `#endif' conditionals seen so far one level deeper, etc.
 299       # As a consequence, uneven values are used within a clause, and even
 300       # values after a clause, since the C standard doesn't allow the
 301       # redefinition of an enumeration value.  For example, the name
 302       # `af_blue_5_1_6' is used to construct enumeration values in the fifth
 303       # section after the third (second-level) if-clause within the first
 304       # (top-level) if-clause.  After the first top-level clause has
 305       # finished, `af_blue_5_2' is used.  The current offset is then
 306       # relative to the value stored in the current auxiliary element.
 307
 308       if (/ ^ \# \s* if /x)
 309       {
 310         push @else_stack, 0;
 311
 312         $name_stack[$#name_stack]++;
 313
 314         push @{$diversions{$curr_enum}}, enum_val_string(aux_name());
 315         $last_aux = aux_name();
 316
 317         push @name_stack, 0;
 318
 319         $curr_offset = 0;
 320       }
 321       elsif (/ ^ \# \s* elif /x)
 322       {
 323         Die("unbalanced #elif") unless @else_stack;
 324
 325         pop @name_stack;
 326
 327         push @{$diversions{$curr_enum}}, enum_val_string(aux_name_next());
 328         $last_aux = aux_name();
 329
 330         push @name_stack, 0;
 331
 332         $curr_offset = 0;
 333       }
 334       elsif (/ ^ \# \s* else /x)
 335       {
 336         my $prev_else = pop @else_stack;
 337         Die("unbalanced #else") unless defined($prev_else);
 338         Die("#else already seen") if $prev_else;
 339         push @else_stack, 1;
 340
 341         pop @name_stack;
 342
 343         push @{$diversions{$curr_enum}}, enum_val_string(aux_name_next());
 344         $last_aux = aux_name();
 345
 346         push @name_stack, 0;
 347
 348         $curr_offset = 0;
 349       }
 350       elsif (/ ^ (\# \s*) endif /x)
 351       {
 352         my $prev_else = pop @else_stack;
 353         Die("unbalanced #endif") unless defined($prev_else);
 354
 355         pop @name_stack;
 356
 357         # If there is no else-clause for an if-clause, we add one.  This is
 358         # necessary to have correct offsets.
 359         if (!$prev_else)
 360         {
 361           # Use amount of whitespace from `endif'.
 362           push @{$diversions{$curr_enum}}, enum_val_string(aux_name_next())
 363                                            . $1 . "else\n";
 364           $last_aux = aux_name();
 365
 366           $curr_offset = 0;
 367         }
 368
 369         $name_stack[$#name_stack]++;
 370
 371         push @{$diversions{$curr_enum}}, enum_val_string(aux_name());
 372         $last_aux = aux_name();
 373
 374         $curr_offset = 0;
 375       }
 376
 377       # Handle (probably continued) preprocessor lines.
 378     CONTINUED_LOOP:
 379       {
 380         do
 381         {
 382           strip_newline();
 383
 384           push @{$diversions{$curr_enum}}, $ARG . "\n";
 385           push @{$diversions{$curr_array}}, $ARG . "\n";
 386
 387           last CONTINUED_LOOP unless / \\ $ /x;
 388
 389         } while (<DATA>);
 390       }
 391     }
 392     else
 393     {
 394       warn_before();
 395     }
 396
 397     next;
 398   }
 399
 400   if (/$enum_element_re/)
 401   {
 402     end_curr_string();
 403     update_max_elem_size();
 404
 405     $curr_enum_element = $1;
 406     $have_enum_element = 1;
 407     $curr_elem_size = 0;
 408
 409     next;
 410   }
 411
 412   if (/$string_re/)
 413   {
 414     if ($have_sections)
 415     {
 416       Die("strings and blocks can't be mixed in a section") if $have_blocks;
 417
 418       # Save captured group from `string_re'.
 419       my $string = $1;
 420
 421       if ($have_enum_element)
 422       {
 423         push @{$diversions{$curr_enum}}, enum_val_string($curr_enum_element);
 424         $have_enum_element = 0;
 425       }
 426
 427       $string = convert_literal($string);
 428
 429       push @{$diversions{$curr_array}}, "    $string\n";
 430
 431       $have_strings = 1;
 432       $in_string = 1;
 433     }
 434     else
 435     {
 436       warn_before();
 437     }
 438
 439     next;
 440   }
 441
 442   if (/$block_start_re/)
 443   {
 444     if ($have_sections)
 445     {
 446       Die("strings and blocks can't be mixed in a section") if $have_strings;
 447
 448       my $depth = 0;
 449       my $block = "";
 450       my $block_end = 0;
 451
 452       # Count braces while getting the block.
 453     BRACE_LOOP:
 454       {
 455         do
 456         {
 457           strip_newline();
 458
 459           foreach my $substring (split(/$brace_re/))
 460           {
 461             if ($block_end)
 462             {
 463               Die("invalid data after last matching closing brace")
 464                 if $substring !~ /$whitespace_only_re/;
 465             }
 466
 467             $block .= $substring;
 468
 469             if ($substring eq '{')
 470             {
 471               $depth++;
 472             }
 473             elsif ($substring eq '}')
 474             {
 475               $depth--;
 476
 477               $block_end = 1 if $depth == 0;
 478             }
 479           }
 480
 481           # If we are here, we have run out of substrings, so get next line
 482           # or exit.
 483           last BRACE_LOOP if $block_end;
 484
 485           $block .= "\n";
 486
 487         } while (<DATA>);
 488       }
 489
 490       if ($have_enum_element)
 491       {
 492         push @{$diversions{$curr_enum}}, enum_val_string($curr_enum_element);
 493         $have_enum_element = 0;
 494       }
 495
 496       push @{$diversions{$curr_array}}, $block . ",\n";
 497
 498       $curr_offset++;
 499       $curr_elem_size++;
 500
 501       $have_blocks = 1;
 502     }
 503     else
 504     {
 505       warn_before();
 506     }
 507
 508     next;
 509   }
 510
 511   # Garbage.  We weren't able to parse the data.
 512   Die("syntax error");
 513 }
 514
 515 # Finalize data.
 516 end_curr_string();
 517 update_max_elem_size();
 518
 519
 520 # Filter stdin to stdout, replacing `@...@' templates.
 521
 522 sub emit_diversion
 523 {
 524   my $diversion_name = shift;
 525   return (exists($diversions{$1})) ? "@{$diversions{$1}}"
 526                                    : "@" . $diversion_name . "@";
 527 }
 528
 529
 530 $LIST_SEPARATOR = '';
 531
 532 my $s1 = "This file has been generated by the Perl script \`$prog',";
 533 my $s1len = length $s1;
 534 my $s2 = "using data from file \`$datafile'.";
 535 my $s2len = length $s2;
 536 my $slen = ($s1len > $s2len) ? $s1len : $s2len;
 537
 538 print "/* " . $s1 . " " x ($slen - $s1len) . " */\n"
 539       . "/* " . $s2 . " " x ($slen - $s2len) . " */\n"
 540       . "\n";
 541
 542 while (<STDIN>)
 543 {
 544   s/ @ ( [A-Za-z0-9_]+? ) @ / emit_diversion($1) /egx;
 545   print;
 546 }
 547
 548 # EOF