| 1 |
#!/usr/bin/perl |
| 2 |
use strict; |
| 3 |
use warnings; |
| 4 |
use feature 'state'; |
| 5 |
use CGI::Carp qw(fatalsToBrowser); |
| 6 |
|
| 7 |
use lib q[/home/wakaba/work/manakai2/lib]; |
| 8 |
use Message::CGI::Util qw/percent_decode htescape/; |
| 9 |
use Message::CGI::HTTP; |
| 10 |
|
| 11 |
use Regexp::Parser; |
| 12 |
use Graph::Easy; |
| 13 |
|
| 14 |
use Scalar::Util qw/refaddr/; |
| 15 |
|
| 16 |
my $default_map = {}; |
| 17 |
for (qw/. \C \w \W \s \S \d \D \X \1 \2 \3 \4 \5 \6 \7 \8 \9 |
| 18 |
\A ^ \B \b \G \Z \z $/) { |
| 19 |
$default_map->{$_} = qq[Perl /$_/]; |
| 20 |
} |
| 21 |
|
| 22 |
my $assertion_map = { |
| 23 |
ifmatch => '(?=)', |
| 24 |
'<ifmatch' => '(?<=)', |
| 25 |
unlessm => '(?!)', |
| 26 |
'<unlessm' => '(?<!)', |
| 27 |
}; |
| 28 |
|
| 29 |
my $cgi = Message::CGI::HTTP->new; |
| 30 |
|
| 31 |
my $regexp = percent_decode $cgi->get_parameter ('s') // ''; |
| 32 |
$regexp = '(?:)' unless length $regexp; |
| 33 |
|
| 34 |
my $parser = Regexp::Parser->new; |
| 35 |
|
| 36 |
package Regexp::Parser; |
| 37 |
|
| 38 |
# start of char class range (or maybe just char) |
| 39 |
$parser->add_handler('cc' => sub { |
| 40 |
my ($S) = @_; |
| 41 |
return if ${&Rx} =~ m{ \G (?= ] | \z ) }xgc; |
| 42 |
push @{ $S->{next} }, qw< cc >; |
| 43 |
my ($lhs, $rhs, $before_range); |
| 44 |
my $ret = \$lhs; |
| 45 |
|
| 46 |
{ |
| 47 |
if (${&Rx} =~ m{ \G ( \\ ) }xgcs) { |
| 48 |
my $c = $1; |
| 49 |
$$ret = $S->$c(1); |
| 50 |
} |
| 51 |
elsif (${&Rx} =~ m{ \G \[ ([.=:]) (\^?) (.*?) \1 \] }xgcs) { |
| 52 |
my ($how, $neg, $name) = ($1, $2, $3); |
| 53 |
my $posix = "POSIX_$name"; |
| 54 |
if ($S->can($posix)) { $$ret = $S->$posix($neg, $how) } |
| 55 |
else { $S->error(RPe_BADPOS, "$how$neg$name$how") } |
| 56 |
} |
| 57 |
elsif (${&Rx} =~ m{ \G (.) }xgcs) { |
| 58 |
$$ret = $S->force_object(anyof_char => $1); |
| 59 |
} |
| 60 |
|
| 61 |
if ($ret == \$lhs) { |
| 62 |
if (${&Rx} =~ m{ \G (?= - ) }xgc) { |
| 63 |
if ($lhs->visual =~ /^(?:\[[:.=]|\\[dDsSwWpP])/) { |
| 64 |
$S->warn(RPe_FRANGE, $lhs->visual, ""); |
| 65 |
$ret = $lhs; |
| 66 |
last; |
| 67 |
} |
| 68 |
$before_range = &RxPOS++; |
| 69 |
$ret = \$rhs; |
| 70 |
redo; |
| 71 |
} |
| 72 |
$ret = $lhs; |
| 73 |
} |
| 74 |
elsif ($ret == \$rhs) { |
| 75 |
if ($rhs->visual =~ /^(?:\[[:.=]|\\[dDsSwWpP])/) { |
| 76 |
$S->warn(RPe_FRANGE, $lhs->visual, $rhs->visual); |
| 77 |
&RxPOS = $before_range; |
| 78 |
$ret = $lhs; |
| 79 |
} |
| 80 |
elsif ($lhs->data gt $rhs->data) { |
| 81 |
$S->error(RPe_IRANGE, $lhs->visual, $rhs->visual); |
| 82 |
} |
| 83 |
else { |
| 84 |
$ret = $S->object(anyof_range => $lhs, $rhs); |
| 85 |
} |
| 86 |
} |
| 87 |
} |
| 88 |
|
| 89 |
return if &SIZE_ONLY; |
| 90 |
return $ret; |
| 91 |
}); |
| 92 |
|
| 93 |
package main; |
| 94 |
|
| 95 |
$parser->parse ($regexp); |
| 96 |
my $eregexp = htescape $regexp; |
| 97 |
|
| 98 |
if ($parser->errnum) { |
| 99 |
binmode STDOUT, ':encoding(utf-8)'; |
| 100 |
print "Content-Type: text/html; charset=utf-8\n\n"; |
| 101 |
print q[<!DOCTYPE HTML><html lang=en> |
| 102 |
<title>Regular expression visualizer: $eregexp</title> |
| 103 |
<link rel="stylesheet" href="/www/style/html/xhtml"/> |
| 104 |
</head> |
| 105 |
<body> |
| 106 |
<h1>Regular expression visualizer</h1> |
| 107 |
|
| 108 |
<p>Input: <code>], $eregexp, q[</code></p> |
| 109 |
|
| 110 |
<p>Error: ], htescape ($parser->errmsg); |
| 111 |
exit; |
| 112 |
} |
| 113 |
|
| 114 |
binmode STDOUT, ':encoding(utf-8)'; |
| 115 |
print "Content-Type: application/xhtml+xml; charset=utf-8\n\n"; |
| 116 |
|
| 117 |
add_regexp ($parser->root); |
| 118 |
|
| 119 |
print q[<html lang="en" xmlns="http://www.w3.org/1999/xhtml"> |
| 120 |
<head><title>Regular expression visualizer: $eregexp</title> |
| 121 |
<link rel="stylesheet" href="/www/style/html/xhtml"/> |
| 122 |
</head> |
| 123 |
<body> |
| 124 |
<h1>Regular expression visualizer</h1> |
| 125 |
|
| 126 |
<p>Input: <code>], $eregexp, q[</code></p>]; |
| 127 |
|
| 128 |
my @regexp; |
| 129 |
while (@regexp) { |
| 130 |
my $nodes = shift @regexp; |
| 131 |
|
| 132 |
my $index = get_graph_index ($nodes); |
| 133 |
print "<section><h2>Regexp #$index</h2>\n\n"; |
| 134 |
|
| 135 |
my $g = generate_graph ($nodes); |
| 136 |
print $g->as_svg; |
| 137 |
|
| 138 |
print "</section>\n"; |
| 139 |
} |
| 140 |
|
| 141 |
print q[</body></html>]; |
| 142 |
|
| 143 |
sub escape_value ($) { |
| 144 |
my $v = shift; |
| 145 |
$v =~ s/(\W)/sprintf '\x{%04X}', ord $1/ge; |
| 146 |
$v; |
| 147 |
} # escape_value |
| 148 |
|
| 149 |
sub escape_code ($) { |
| 150 |
my $v = shift; |
| 151 |
$v =~ s/([^\x20-\x5B\x5D-\x7E])/sprintf '\x{%04X}', ord $1/ge; |
| 152 |
$v; |
| 153 |
} # escape_code |
| 154 |
|
| 155 |
sub add_regexp ($) { |
| 156 |
my $nodes = shift; |
| 157 |
push @regexp, $nodes; |
| 158 |
} # add_regexp |
| 159 |
|
| 160 |
sub get_graph_index ($) { |
| 161 |
state $index; |
| 162 |
state $next_index ||= 0; |
| 163 |
|
| 164 |
my $nodes = shift; |
| 165 |
$index->{$nodes} //= $next_index++; |
| 166 |
return $index->{$nodes}; |
| 167 |
} # get_graph_index |
| 168 |
|
| 169 |
sub generate_graph ($$) { |
| 170 |
my ($root_nodes) = @_; |
| 171 |
|
| 172 |
my $g = Graph::Easy->new; |
| 173 |
|
| 174 |
$g->set_attributes ('node.start' => {fill => 'blue', color => 'white'}); |
| 175 |
$g->set_attributes ('node.success' => {fill => 'green', color => 'white'}); |
| 176 |
|
| 177 |
my $start_n = $g->add_node ('START'); |
| 178 |
$start_n->set_attribute (class => 'start'); |
| 179 |
my $success_n = $g->add_node ('SUCCESS'); |
| 180 |
$success_n->set_attribute (class => 'success'); |
| 181 |
|
| 182 |
my ($first_ns, $last_ns, $is_optional) = add_to_graph ($root_nodes => $g); |
| 183 |
$g->add_edge ($start_n => $_) for @$first_ns; |
| 184 |
$g->add_edge ($_ => $success_n) for @$last_ns; |
| 185 |
$g->add_edge ($start_n => $success_n) if $is_optional; |
| 186 |
|
| 187 |
return $g; |
| 188 |
} # generate_graph |
| 189 |
|
| 190 |
sub add_to_graph ($$) { |
| 191 |
my ($node, $g) = @_; |
| 192 |
|
| 193 |
my $family = ref $node eq 'ARRAY' ? '' : $node->family; |
| 194 |
my $type = ref $node eq 'ARRAY' ? '' : $node->type; |
| 195 |
if ($family eq 'quant') { |
| 196 |
my ($min, $max) = ($node->min, $node->max); |
| 197 |
return ([], [], 1) if $max eq '0'; |
| 198 |
my ($first_ns, $last_ns, $is_optional) = add_to_graph ($node->data => $g); |
| 199 |
|
| 200 |
my $label; |
| 201 |
if ($max eq '') { |
| 202 |
if ($min == 0) { |
| 203 |
$is_optional = 1; |
| 204 |
$label = ''; |
| 205 |
|
| 206 |
} elsif ($min == 1) { |
| 207 |
$label = ''; |
| 208 |
|
| 209 |
} else { |
| 210 |
$label = 'at least ' . ($min - 1); |
| 211 |
|
| 212 |
} |
| 213 |
} elsif ($max == 1) { |
| 214 |
if ($min == 0) { |
| 215 |
$is_optional = 1; |
| 216 |
|
| 217 |
} else { |
| 218 |
|
| 219 |
} |
| 220 |
} else { |
| 221 |
$label = 'at most ' . ($max - 1); |
| 222 |
if ($min == 0) { |
| 223 |
$is_optional = 1; |
| 224 |
|
| 225 |
|
| 226 |
} elsif ($min == 1) { |
| 227 |
|
| 228 |
} else { |
| 229 |
$label = 'at least ' . ($min - 1) . ', ' . $label; |
| 230 |
|
| 231 |
} |
| 232 |
} |
| 233 |
|
| 234 |
if (@$first_ns != 1 or @$last_ns != 1) { |
| 235 |
my $n = $g->add_node (refaddr $first_ns); |
| 236 |
$n->set_attribute (label => ''); |
| 237 |
my $m = $n; |
| 238 |
unless ($is_optional) { |
| 239 |
$m = $g->add_node (refaddr $last_ns); |
| 240 |
$m->set_attribute (label => ''); |
| 241 |
} else { |
| 242 |
$is_optional = 0; |
| 243 |
} |
| 244 |
$g->add_edge ($n => $_) for @$first_ns; |
| 245 |
$g->add_edge ($_ => $m) for @$last_ns; |
| 246 |
$first_ns = [$n]; |
| 247 |
$last_ns = [$m]; |
| 248 |
} |
| 249 |
|
| 250 |
if (defined $label) { |
| 251 |
my $e = $g->add_edge ($last_ns->[0] => $first_ns->[0]); |
| 252 |
$e->set_attribute (label => $label); |
| 253 |
} |
| 254 |
|
| 255 |
return ($first_ns, $last_ns, $is_optional); |
| 256 |
} elsif ($type eq 'branch') { |
| 257 |
my @first_n; |
| 258 |
my @last_n; |
| 259 |
my $is_optional = 0; |
| 260 |
for (@{$node->data}) { |
| 261 |
my ($f_ns, $l_ns, $is_opt) = add_to_graph ($_ => $g); |
| 262 |
push @first_n, @$f_ns; |
| 263 |
push @last_n, @$l_ns; |
| 264 |
$is_optional |= $is_opt; |
| 265 |
} |
| 266 |
return (\@first_n, \@last_n, $is_optional); |
| 267 |
} elsif ($type eq 'anyof') { |
| 268 |
if ($node->neg) { |
| 269 |
my $nodes = Regexp::Parser::branch->new ($node->{rx}); |
| 270 |
$nodes->{data} = $node->data; |
| 271 |
|
| 272 |
add_regexp ($nodes); |
| 273 |
|
| 274 |
my $n = $g->add_node (refaddr $nodes); |
| 275 |
my $label = 'NOT #' . get_graph_index ($nodes); |
| 276 |
$n->set_attribute (label => $label); |
| 277 |
|
| 278 |
return ([$n], [$n], 0); |
| 279 |
} else { |
| 280 |
my @first_n; |
| 281 |
my @last_n; |
| 282 |
for (@{$node->data}) { |
| 283 |
my ($f_ns, $l_ns) = add_to_graph ($_ => $g); |
| 284 |
push @first_n, @$f_ns; |
| 285 |
push @last_n, @$l_ns; |
| 286 |
} |
| 287 |
return (\@first_n, \@last_n, 0); |
| 288 |
} |
| 289 |
} elsif ($type eq '') { |
| 290 |
my $prev_ns; |
| 291 |
my $first_ns; |
| 292 |
my $is_optional = 1; |
| 293 |
for (@{$node}) { |
| 294 |
my ($f_ns, $l_ns, $is_opt) = add_to_graph ($_ => $g); |
| 295 |
if ($prev_ns) { |
| 296 |
if (@$prev_ns > 1 and @$f_ns > 1) { |
| 297 |
my $n = $g->add_node (refaddr $f_ns); |
| 298 |
$n->set_attribute (label => ''); |
| 299 |
$g->add_edge ($_ => $n) for @$prev_ns; |
| 300 |
$g->add_edge ($n => $_) for @$f_ns; |
| 301 |
} else { |
| 302 |
for my $prev_n (@$prev_ns) { |
| 303 |
for my $f_n (@$f_ns) { |
| 304 |
$g->add_edge ($prev_n => $f_n); |
| 305 |
} |
| 306 |
} |
| 307 |
} |
| 308 |
if ($is_optional) { |
| 309 |
push @$first_ns, @$f_ns; |
| 310 |
} |
| 311 |
if ($is_opt) { |
| 312 |
push @$prev_ns, @$l_ns; |
| 313 |
} else { |
| 314 |
$prev_ns = $l_ns if @$l_ns; |
| 315 |
} |
| 316 |
} else { |
| 317 |
$first_ns = $f_ns; |
| 318 |
$prev_ns = $l_ns if @$l_ns; |
| 319 |
} |
| 320 |
$is_optional &= $is_opt; |
| 321 |
} |
| 322 |
return ($first_ns || [], $prev_ns || [], $is_optional); |
| 323 |
} elsif ($family eq 'group' or $family eq 'open' or $type eq 'suspend') { |
| 324 |
## TODO: (?:) vs () vs (?>), (?:)->on, (?:)->off |
| 325 |
my ($f_ns, $l_ns, $is_opt) = add_to_graph ($node->data => $g); |
| 326 |
return ($f_ns, $l_ns, $is_opt); |
| 327 |
} elsif ($type eq 'ifthen') { |
| 328 |
my $nodes = $node->data; |
| 329 |
|
| 330 |
my $groupp = $nodes->[0]; |
| 331 |
my $label = $groupp ? '(?' . $groupp->visual . ')' : ''; |
| 332 |
my $n = $g->add_node (refaddr $groupp); |
| 333 |
$n->set_attribute (label => $label); |
| 334 |
|
| 335 |
my $l = $g->add_node (refaddr $nodes); |
| 336 |
$l->set_attribute (label => ''); |
| 337 |
|
| 338 |
my $branch = $nodes->[1]; |
| 339 |
my $branches = $branch ? $branch->data : []; |
| 340 |
|
| 341 |
my $true = $branches->[0]; |
| 342 |
if ($true) { |
| 343 |
my ($f_ns, $l_ns, $is_opt) = add_to_graph ($true => $g); |
| 344 |
$g->add_edge ($n => $_)->set_attribute (label => 'true') for @$f_ns; |
| 345 |
$g->add_edge ($_ => $l) for @$l_ns; |
| 346 |
$g->add_edge ($n => $l)->set_attribute (label => 'true') if $is_opt; |
| 347 |
} |
| 348 |
|
| 349 |
my $false = $branches->[1]; |
| 350 |
if ($false) { |
| 351 |
my ($f_ns, $l_ns, $is_opt) = add_to_graph ($false => $g); |
| 352 |
$g->add_edge ($n => $_)->set_attribute (label => 'false') for @$f_ns; |
| 353 |
$g->add_edge ($_ => $l) for @$l_ns; |
| 354 |
$g->add_edge ($n => $l)->set_attribute (label => 'false') if $is_opt; |
| 355 |
} |
| 356 |
|
| 357 |
return ([$n], [$l], 0); |
| 358 |
} elsif ($type eq 'eval' or $type eq 'logical') { |
| 359 |
my $n = $g->add_node (refaddr $node); |
| 360 |
my $label = $type eq 'eval' ? '(?{})' : '(??{})'; |
| 361 |
$label .= ' ' . escape_code $node->data; |
| 362 |
$n->set_attribute (label => $label); |
| 363 |
return ([$n], [$n], 0); |
| 364 |
} elsif ($family eq 'assertion') { |
| 365 |
my $nodes = $node->data; |
| 366 |
add_regexp ($nodes); |
| 367 |
|
| 368 |
my $n = $g->add_node (refaddr $nodes); |
| 369 |
$type = '<' . $type if $node->dir < 0; |
| 370 |
my $label = $assertion_map->{$type} // $type; |
| 371 |
$label .= ' #' . get_graph_index ($nodes); |
| 372 |
$n->set_attribute (label => $label); |
| 373 |
|
| 374 |
return ([$n], [$n], 0); |
| 375 |
} elsif ($family eq 'anyof_class') { |
| 376 |
my $data = $node->data; |
| 377 |
my $label; |
| 378 |
if ($data eq 'POSIX') { |
| 379 |
my $how = ${$node->{how}}; |
| 380 |
if ($how eq ':') { |
| 381 |
$label = 'POSIX ' . $node->{type}; |
| 382 |
$label = 'NOT ' . $label if $node->neg; |
| 383 |
} else { |
| 384 |
$label = $how . $node->neg . $node->{type} . $how; |
| 385 |
} |
| 386 |
} else { |
| 387 |
my $data_family = $data->family; |
| 388 |
if ($data_family eq 'prop') { |
| 389 |
$label = 'property ' . $node->type; |
| 390 |
$label = 'NOT ' . $label if $node->neg; |
| 391 |
} elsif ($data_family eq 'space') { |
| 392 |
$label = $data->neg ? 'Perl /\S/' : 'Perl /\s/'; |
| 393 |
} elsif ($data_family eq 'alnum') { |
| 394 |
$label = $data->neg ? 'Perl /\W/' : 'Perl /\w/'; |
| 395 |
} elsif ($data_family eq 'digit') { |
| 396 |
$label = $data->neg ? 'Perl /\D/' : 'Perl /\d/'; |
| 397 |
} else { |
| 398 |
$label = $data->visual; |
| 399 |
} |
| 400 |
} |
| 401 |
|
| 402 |
my $n = $g->add_node (refaddr $node); |
| 403 |
$n->set_attribute (label => $label); |
| 404 |
|
| 405 |
return ([$n] => [$n]); |
| 406 |
} elsif ($family eq 'exact' or $type eq 'anyof_char') { |
| 407 |
my $n = $g->add_node (refaddr $node); |
| 408 |
|
| 409 |
my $label = escape_value $node->data; |
| 410 |
$n->set_attribute (label => qq[ "$label" ]); |
| 411 |
|
| 412 |
return ([$n] => [$n]); |
| 413 |
} elsif ($family eq 'flags') { |
| 414 |
## TODO: scope |
| 415 |
my $n = $g->add_node (refaddr $node); |
| 416 |
|
| 417 |
my $label = $node->visual; |
| 418 |
$n->set_attribute (label => $label); |
| 419 |
|
| 420 |
return ([$n] => [$n], 0); |
| 421 |
} elsif ($family eq 'minmod') { |
| 422 |
my $nodes = $node->data; |
| 423 |
add_regexp ($nodes); |
| 424 |
|
| 425 |
my $n = $g->add_node (refaddr $nodes); |
| 426 |
my $label = 'non-greedy #' . get_graph_index ($nodes); |
| 427 |
$n->set_attribute (label => $label); |
| 428 |
|
| 429 |
return ([$n], [$n], 0); |
| 430 |
} elsif ($family eq 'anyof_range') { |
| 431 |
my $n = $g->add_node (refaddr $node); |
| 432 |
|
| 433 |
my $start = escape_value $node->data->[0]->data; |
| 434 |
my $end = escape_value $node->data->[1]->data; |
| 435 |
my $label = qq[ one of "$start" .. "$end" ]; |
| 436 |
$n->set_attribute (label => $label); |
| 437 |
|
| 438 |
return ([$n] => [$n], 0); |
| 439 |
} else { |
| 440 |
# anyof_char |
| 441 |
# anyof_range |
| 442 |
|
| 443 |
my $n = $g->add_node (refaddr $node); |
| 444 |
|
| 445 |
my $label = $node->visual; |
| 446 |
$label = $default_map->{$label} // escape_value $label; |
| 447 |
$label .= ' (' . $type . ')'; |
| 448 |
$n->set_attribute (label => $label); |
| 449 |
|
| 450 |
return ([$n] => [$n], 0); |
| 451 |
} |
| 452 |
} # add_to_graph |
| 453 |
|
Parent Directory
| 
Revision Log