#!/usr/bin/perl use strict; use warnings; use feature 'state'; use CGI::Carp qw(fatalsToBrowser); use lib q[/home/wakaba/work/manakai2/lib]; use Message::CGI::Util qw/percent_decode htescape/; use Message::CGI::HTTP; use Regexp::Parser; use Graph::Easy; use Scalar::Util qw/refaddr/; my $default_map = {}; for (qw/. \C \w \W \s \S \d \D \X \1 \2 \3 \4 \5 \6 \7 \8 \9 \A ^ \B \b \G \Z \z $/) { $default_map->{$_} = qq[Perl /$_/]; } my $assertion_map = { ifmatch => '(?=)', ' '(?<=)', unlessm => '(?!)', ' '(?new; my $regexp = percent_decode $cgi->get_parameter ('s') // ''; $regexp = '(?:)' unless length $regexp; my $parser = Regexp::Parser->new; package Regexp::Parser; # start of char class range (or maybe just char) $parser->add_handler('cc' => sub { my ($S) = @_; return if ${&Rx} =~ m{ \G (?= ] | \z ) }xgc; push @{ $S->{next} }, qw< cc >; my ($lhs, $rhs, $before_range); my $ret = \$lhs; { if (${&Rx} =~ m{ \G ( \\ ) }xgcs) { my $c = $1; $$ret = $S->$c(1); } elsif (${&Rx} =~ m{ \G \[ ([.=:]) (\^?) (.*?) \1 \] }xgcs) { my ($how, $neg, $name) = ($1, $2, $3); my $posix = "POSIX_$name"; if ($S->can($posix)) { $$ret = $S->$posix($neg, $how) } else { $S->error(RPe_BADPOS, "$how$neg$name$how") } } elsif (${&Rx} =~ m{ \G (.) }xgcs) { $$ret = $S->force_object(anyof_char => $1); } if ($ret == \$lhs) { if (${&Rx} =~ m{ \G (?= - ) }xgc) { if ($lhs->visual =~ /^(?:\[[:.=]|\\[dDsSwWpP])/) { $S->warn(RPe_FRANGE, $lhs->visual, ""); $ret = $lhs; last; } $before_range = &RxPOS++; $ret = \$rhs; redo; } $ret = $lhs; } elsif ($ret == \$rhs) { if ($rhs->visual =~ /^(?:\[[:.=]|\\[dDsSwWpP])/) { $S->warn(RPe_FRANGE, $lhs->visual, $rhs->visual); &RxPOS = $before_range; $ret = $lhs; } elsif ($lhs->data gt $rhs->data) { $S->error(RPe_IRANGE, $lhs->visual, $rhs->visual); } else { $ret = $S->object(anyof_range => $lhs, $rhs); } } } return if &SIZE_ONLY; return $ret; }); package main; $parser->parse ($regexp); my $eregexp = htescape $regexp; if ($parser->errnum) { binmode STDOUT, ':encoding(utf-8)'; print "Content-Type: text/html; charset=utf-8\n\n"; print q[ Regular expression visualizer: $eregexp

Regular expression visualizer

Input: ], $eregexp, q[

Error: ], htescape ($parser->errmsg); exit; } binmode STDOUT, ':encoding(utf-8)'; print "Content-Type: application/xhtml+xml; charset=utf-8\n\n"; add_regexp ($parser->root); print q[ Regular expression visualizer: $eregexp

Regular expression visualizer

Input: ], $eregexp, q[

]; my @regexp; while (@regexp) { my $nodes = shift @regexp; my $index = get_graph_index ($nodes); print "

Regexp #$index

\n\n"; my $g = generate_graph ($nodes); print $g->as_svg; print "

\n"; } print q[]; sub escape_value ($) { my $v = shift; $v =~ s/(\W)/sprintf '\x{%04X}', ord $1/ge; $v; } # escape_value sub escape_code ($) { my $v = shift; $v =~ s/([^\x20-\x5B\x5D-\x7E])/sprintf '\x{%04X}', ord $1/ge; $v; } # escape_code sub add_regexp ($) { my $nodes = shift; push @regexp, $nodes; } # add_regexp sub get_graph_index ($) { state $index; state $next_index ||= 0; my $nodes = shift; $index->{$nodes} //= $next_index++; return $index->{$nodes}; } # get_graph_index sub generate_graph ($$) { my ($root_nodes) = @_; my $g = Graph::Easy->new; $g->set_attributes ('node.start' => {fill => 'blue', color => 'white'}); $g->set_attributes ('node.success' => {fill => 'green', color => 'white'}); my $start_n = $g->add_node ('START'); $start_n->set_attribute (class => 'start'); my $success_n = $g->add_node ('SUCCESS'); $success_n->set_attribute (class => 'success'); my ($first_ns, $last_ns, $is_optional) = add_to_graph ($root_nodes => $g); $g->add_edge ($start_n => $_) for @$first_ns; $g->add_edge ($_ => $success_n) for @$last_ns; $g->add_edge ($start_n => $success_n) if $is_optional; return $g; } # generate_graph sub add_to_graph ($$) { my ($node, $g) = @_; my $family = ref $node eq 'ARRAY' ? '' : $node->family; my $type = ref $node eq 'ARRAY' ? '' : $node->type; if ($family eq 'quant') { my ($min, $max) = ($node->min, $node->max); return ([], [], 1) if $max eq '0'; my ($first_ns, $last_ns, $is_optional) = add_to_graph ($node->data => $g); my $label; if ($max eq '') { if ($min == 0) { $is_optional = 1; $label = ''; } elsif ($min == 1) { $label = ''; } else { $label = 'at least ' . ($min - 1); } } elsif ($max == 1) { if ($min == 0) { $is_optional = 1; } else { } } else { $label = 'at most ' . ($max - 1); if ($min == 0) { $is_optional = 1; } elsif ($min == 1) { } else { $label = 'at least ' . ($min - 1) . ', ' . $label; } } if (@$first_ns != 1 or @$last_ns != 1) { my $n = $g->add_node (refaddr $first_ns); $n->set_attribute (label => ''); my $m = $n; unless ($is_optional) { $m = $g->add_node (refaddr $last_ns); $m->set_attribute (label => ''); } else { $is_optional = 0; } $g->add_edge ($n => $_) for @$first_ns; $g->add_edge ($_ => $m) for @$last_ns; $first_ns = [$n]; $last_ns = [$m]; } if (defined $label) { my $e = $g->add_edge ($last_ns->[0] => $first_ns->[0]); $e->set_attribute (label => $label); } return ($first_ns, $last_ns, $is_optional); } elsif ($type eq 'branch') { my @first_n; my @last_n; my $is_optional = 0; for (@{$node->data}) { my ($f_ns, $l_ns, $is_opt) = add_to_graph ($_ => $g); push @first_n, @$f_ns; push @last_n, @$l_ns; $is_optional |= $is_opt; } return (\@first_n, \@last_n, $is_optional); } elsif ($type eq 'anyof') { if ($node->neg) { my $nodes = Regexp::Parser::branch->new ($node->{rx}); $nodes->{data} = $node->data; add_regexp ($nodes); my $n = $g->add_node (refaddr $nodes); my $label = 'NOT #' . get_graph_index ($nodes); $n->set_attribute (label => $label); return ([$n], [$n], 0); } else { my @first_n; my @last_n; for (@{$node->data}) { my ($f_ns, $l_ns) = add_to_graph ($_ => $g); push @first_n, @$f_ns; push @last_n, @$l_ns; } return (\@first_n, \@last_n, 0); } } elsif ($type eq '') { my $prev_ns; my $first_ns; my $is_optional = 1; for (@{$node}) { my ($f_ns, $l_ns, $is_opt) = add_to_graph ($_ => $g); if ($prev_ns) { if (@$prev_ns > 1 and @$f_ns > 1) { my $n = $g->add_node (refaddr $f_ns); $n->set_attribute (label => ''); $g->add_edge ($_ => $n) for @$prev_ns; $g->add_edge ($n => $_) for @$f_ns; } else { for my $prev_n (@$prev_ns) { for my $f_n (@$f_ns) { $g->add_edge ($prev_n => $f_n); } } } if ($is_optional) { push @$first_ns, @$f_ns; } if ($is_opt) { push @$prev_ns, @$l_ns; } else { $prev_ns = $l_ns if @$l_ns; } } else { $first_ns = $f_ns; $prev_ns = $l_ns if @$l_ns; } $is_optional &= $is_opt; } return ($first_ns || [], $prev_ns || [], $is_optional); } elsif ($family eq 'group' or $family eq 'open' or $type eq 'suspend') { ## TODO: (?:) vs () vs (?>), (?:)->on, (?:)->off my ($f_ns, $l_ns, $is_opt) = add_to_graph ($node->data => $g); return ($f_ns, $l_ns, $is_opt); } elsif ($type eq 'ifthen') { my $nodes = $node->data; my $groupp = $nodes->[0]; my $label = $groupp ? '(?' . $groupp->visual . ')' : ''; my $n = $g->add_node (refaddr $groupp); $n->set_attribute (label => $label); my $l = $g->add_node (refaddr $nodes); $l->set_attribute (label => ''); my $branch = $nodes->[1]; my $branches = $branch ? $branch->data : []; my $true = $branches->[0]; if ($true) { my ($f_ns, $l_ns, $is_opt) = add_to_graph ($true => $g); $g->add_edge ($n => $_)->set_attribute (label => 'true') for @$f_ns; $g->add_edge ($_ => $l) for @$l_ns; $g->add_edge ($n => $l)->set_attribute (label => 'true') if $is_opt; } my $false = $branches->[1]; if ($false) { my ($f_ns, $l_ns, $is_opt) = add_to_graph ($false => $g); $g->add_edge ($n => $_)->set_attribute (label => 'false') for @$f_ns; $g->add_edge ($_ => $l) for @$l_ns; $g->add_edge ($n => $l)->set_attribute (label => 'false') if $is_opt; } return ([$n], [$l], 0); } elsif ($type eq 'eval' or $type eq 'logical') { my $n = $g->add_node (refaddr $node); my $label = $type eq 'eval' ? '(?{})' : '(??{})'; $label .= ' ' . escape_code $node->data; $n->set_attribute (label => $label); return ([$n], [$n], 0); } elsif ($family eq 'assertion') { my $nodes = $node->data; add_regexp ($nodes); my $n = $g->add_node (refaddr $nodes); $type = '<' . $type if $node->dir < 0; my $label = $assertion_map->{$type} // $type; $label .= ' #' . get_graph_index ($nodes); $n->set_attribute (label => $label); return ([$n], [$n], 0); } elsif ($family eq 'anyof_class') { my $data = $node->data; my $label; if ($data eq 'POSIX') { my $how = ${$node->{how}}; if ($how eq ':') { $label = 'POSIX ' . $node->{type}; $label = 'NOT ' . $label if $node->neg; } else { $label = $how . $node->neg . $node->{type} . $how; } } else { my $data_family = $data->family; if ($data_family eq 'prop') { $label = 'property ' . $node->type; $label = 'NOT ' . $label if $node->neg; } elsif ($data_family eq 'space') { $label = $data->neg ? 'Perl /\S/' : 'Perl /\s/'; } elsif ($data_family eq 'alnum') { $label = $data->neg ? 'Perl /\W/' : 'Perl /\w/'; } elsif ($data_family eq 'digit') { $label = $data->neg ? 'Perl /\D/' : 'Perl /\d/'; } else { $label = $data->visual; } } my $n = $g->add_node (refaddr $node); $n->set_attribute (label => $label); return ([$n] => [$n]); } elsif ($family eq 'exact' or $type eq 'anyof_char') { my $n = $g->add_node (refaddr $node); my $label = escape_value $node->data; $n->set_attribute (label => qq[ "$label" ]); return ([$n] => [$n]); } elsif ($family eq 'flags') { ## TODO: scope my $n = $g->add_node (refaddr $node); my $label = $node->visual; $n->set_attribute (label => $label); return ([$n] => [$n], 0); } elsif ($family eq 'minmod') { my $nodes = $node->data; add_regexp ($nodes); my $n = $g->add_node (refaddr $nodes); my $label = 'non-greedy #' . get_graph_index ($nodes); $n->set_attribute (label => $label); return ([$n], [$n], 0); } elsif ($family eq 'anyof_range') { my $n = $g->add_node (refaddr $node); my $start = escape_value $node->data->[0]->data; my $end = escape_value $node->data->[1]->data; my $label = qq[ one of "$start" .. "$end" ]; $n->set_attribute (label => $label); return ([$n] => [$n], 0); } else { # anyof_char # anyof_range my $n = $g->add_node (refaddr $node); my $label = $node->visual; $label = $default_map->{$label} // escape_value $label; $label .= ' (' . $type . ')'; $n->set_attribute (label => $label); return ([$n] => [$n], 0); } } # add_to_graph