316 lines
10 KiB
Prolog
Executable file
316 lines
10 KiB
Prolog
Executable file
#!/usr/bin/perl
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# Test filter partially based on Ambrose's hideous subst.pl code
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# The idea is that the .tmpl files are not valid HTML, and as a result
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# HTML::Parse would be completely confused by these templates.
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# This is just a simple scanner (not a parser) & should give better results.
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# This script is meant to be a drop-in replacement of text-extract.pl
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# FIXME: Strings like "<< Prev" or "Next >>" may confuse *this* filter
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# TODO: Need to detect unclosed tags, empty tags, and other such stuff.
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# (Why? Because Mozilla apparently knows what SGML unclosed tags are :-/ )
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# A grander plan: Code could be written to detect template variables and
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# construct gettext-c-format-string-like meta-strings (e.g., "Results %s
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# through %s of %s records" that will be more likely to be translatable
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# to languages where word order is very unlike English word order.
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# --> This will be relatively major rework, and requires corresponding
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# rework in tmpl_process.pl
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use Getopt::Long;
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use strict;
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use vars qw( $input );
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use vars qw( $debug_dump_only_p );
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use vars qw( $pedantic_p );
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use vars qw( $fatal_p );
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###############################################################################
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# Hideous stuff
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use vars qw( $re_directive );
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BEGIN {
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# $re_directive must not do any backreferences
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$re_directive = q{<(?:(?i)(?:!--\s*)?\/?TMPL_(?:VAR|LOOP|INCLUDE|IF|ELSE|UNLESS)(?:\s+(?:[a-zA-Z][-a-zA-Z0-9]*=)?(?:'[^']*'|"[^"]*"|[^\s<>]+))*\s*(?:--)?)>};
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}
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# Hideous stuff from subst.pl, slightly modified to use the above hideous stuff
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# Note: The $re_tag's set $1 (<tag), $2 (>), and $3 (rest of string)
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use vars qw( $re_comment $re_entity_name $re_end_entity $re_etag );
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use vars qw( $re_tag_strict $re_tag_compat @re_tag );
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sub re_tag ($) {
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my($compat) = @_;
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my $etag = $compat? '>': '<>\/';
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# See the file "subst.pl.test1" for how the following mess is derived
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# Unfortunately, inserting $re_directive's has made this even messier
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q{(<\/?(?:|(?:"(?:} . $re_directive . q{|[^"])*"|'(?:} . $re_directive . q{|[^'])*'|--(?:[^-]|-[^-])*--|(?:} . $re_directive . q{|[^-"'} . $etag . q{]|-[^-]))+))([} . $etag . q{])(.*)};
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}
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BEGIN {
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$re_comment = '(?:--(?:[^-]|-[^-])*--)';
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$re_entity_name = '(?:[^&%#;<>\s]+)'; # NOTE: not really correct SGML
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$re_end_entity = '(?:;|$|(?=\s))'; # semicolon or before-whitespace
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$re_etag = q{(?:<\/?(?:"[^"]*"|'[^']*'|[^"'>\/])*[>\/])}; # end-tag
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@re_tag = ($re_tag_strict, $re_tag_compat) = (re_tag(0), re_tag(1));
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}
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# End of the hideous stuff
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sub KIND_TEXT () { 'TEXT' }
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sub KIND_CDATA () { 'CDATA' }
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sub KIND_TAG () { 'TAG' }
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sub KIND_DECL () { 'DECL' }
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sub KIND_PI () { 'PI' }
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sub KIND_DIRECTIVE () { 'HTML::Template' }
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sub KIND_COMMENT () { 'COMMENT' } # empty DECL with exactly one SGML comment
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sub KIND_UNKNOWN () { 'ERROR' }
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use vars qw( $readahead $lc_0 $lc $syntaxerror_p );
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use vars qw( $cdata_mode_p $cdata_close );
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sub extract_attributes ($;$) {
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my($s, $lc) = @_;
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my %attr;
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$s = $1 if $s =~ /^<\S+(.*)\/\S$/s # XML-style self-closing tags
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|| $s =~ /^<\S+(.*)\S$/s; # SGML-style tags
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for (my $i = 0; $s =~ /^\s+(?:([a-zA-Z][-a-zA-Z0-9]*)\s*=\s*)?('((?:$re_directive|[^'])*)'|"((?:$re_directive|[^"])*)"|(($re_directive|[^\s<>])+))/os;) {
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my($key, $val, $val_orig, $rest)
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= ($1, (defined $3? $3: defined $4? $4: $5), $2, $');
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$i += 1;
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$attr{+lc($key)} = [$key, $val, $val_orig, $i];
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$s = $rest;
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warn "Warning: Attribute should be quoted"
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. (defined $lc? " near line $lc": '') . ": $val_orig\n"
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if $pedantic_p
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&& $val =~ /[^-\.A-Za-z0-9]/s && $val_orig !~ /^['"]/;
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}
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if ($s =~ /\S/s) { # should never happen
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if ($s =~ /^([^\n]*)\n/s) { # this is even worse
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warn "Error: Completely confused while extracting attributes"
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. (defined $lc? " near line $lc": '') . ": $1\n";
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warn "Error: " . (scalar split(/\n/, $s) - 1) . " more line(s) not shown.\n";
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$fatal_p = 1;
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} else {
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warn "Warning: Strange attribute syntax"
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. (defined $lc? " near line $lc": '') . ": $s\n";
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}
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}
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return \%attr;
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}
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sub next_token_internal (*) {
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my($h) = @_;
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my($it, $kind);
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my $eof_p = 0;
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if (!defined $readahead || !length $readahead) {
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my $next = scalar <$h>;
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$eof_p = !defined $next;
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if (!$eof_p) {
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$lc += 1;
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$readahead .= $next;
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}
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}
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$lc_0 = $lc; # remember line number of first line
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if ($eof_p && !length $readahead) { # nothing left to do
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;
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} elsif ($readahead =~ /^\s+/s) { # whitespace
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($kind, $it, $readahead) = (KIND_TEXT, $&, $');
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# FIXME the following (the [<\s] part) is an unreliable HACK :-(
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} elsif ($readahead =~ /^(?:[^<]|<[<\s])+/s) { # non-space normal text
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($kind, $it, $readahead) = (KIND_TEXT, $&, $');
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warn "Warning: Unescaped < near line $lc_0: $it\n" if $it =~ /</s;
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} else { # tag/declaration/processing instruction
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my $ok_p = 0;
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for (;;) {
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if ($cdata_mode_p) {
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if ($readahead =~ /^$cdata_close/) {
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($kind, $it, $readahead) = (KIND_TAG, $&, $');
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$ok_p = 1;
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} else {
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($kind, $it, $readahead) = (KIND_TEXT, $readahead, undef);
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$ok_p = 1;
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}
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} elsif ($readahead =~ /^$re_tag_compat/os) {
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($kind, $it, $readahead) = (KIND_TAG, "$1$2", $3);
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$ok_p = 1;
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} elsif ($readahead =~ /^<!--(?:(?!-->).)*-->/s) {
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($kind, $it, $readahead) = (KIND_COMMENT, $&, $');
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$ok_p = 1;
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warn "Warning: Syntax error in comment at line $lc_0: $&\n";
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$syntaxerror_p = 1;
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}
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last if $ok_p;
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my $next = scalar <$h>;
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$eof_p = !defined $next;
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last if $eof_p;
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$lc += 1;
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$readahead .= $next;
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}
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if ($kind ne KIND_TAG) {
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;
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} elsif ($it =~ /^<!/) {
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$kind = KIND_DECL;
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$kind = KIND_COMMENT if $it =~ /^<!--(?:(?!-->).)*-->/;
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} elsif ($it =~ /^<\?/) {
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$kind = KIND_PI;
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}
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if ($it =~ /^$re_directive/ios && !$cdata_mode_p) {
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$kind = KIND_DIRECTIVE;
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}
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if (!$ok_p && $eof_p) {
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($kind, $it, $readahead) = (KIND_UNKNOWN, $readahead, undef);
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$syntaxerror_p = 1;
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}
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}
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warn "Warning: Unrecognizable token found near line $lc_0: $it\n"
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if $kind eq KIND_UNKNOWN;
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return defined $it? (wantarray? ($kind, $it):
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[$kind, $it]): undef;
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}
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sub next_token (*) {
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my($h) = @_;
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my $it;
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if (!$cdata_mode_p) {
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$it = next_token_internal($h);
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if (defined $it && $it->[0] eq KIND_TAG) { # FIXME
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($cdata_mode_p, $cdata_close) = (1, "</$1\\s*>")
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if $it->[1] =~ /^<(script|style|textarea)\b/i; #FIXME
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push @$it, extract_attributes($it->[1], $lc_0); #FIXME
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}
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} else {
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for ($it = '';;) {
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my $lc_prev = $lc;
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my $next = next_token_internal($h);
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last if !defined $next;
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if (defined $next && $next->[1] =~ /$cdata_close/i) { #FIXME
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($lc, $readahead) = ($lc_prev, $next->[1] . $readahead); #FIXME
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$cdata_mode_p = 0;
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}
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last unless $cdata_mode_p;
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$it .= $next->[1]; #FIXME
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}
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$it = [KIND_CDATA, $it]; #FIXME
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$cdata_close = undef;
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}
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return defined $it? (wantarray? @$it: $it): undef;
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}
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###############################################################################
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sub debug_dump (*) { # for testing only
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my($h) = @_;
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print "re_tag_compat is /$re_tag_compat/\n";
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for (;;) {
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my $s = next_token $h;
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last unless defined $s;
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printf "%s\n", ('-' x 79);
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my($kind, $t, $attr) = @$s; # FIXME
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printf "%s:\n", $kind;
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printf "%4dH%s\n", length($t),
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join('', map {/[\0-\37]/? $_: "$_\b$_"} split(//, $t));
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if ($kind eq KIND_TAG && %$attr) {
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printf "Attributes:\n";
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for my $a (keys %$attr) {
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my($key, $val, $val_orig, $order) = @{$attr->{$a}};
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printf "%s = %dH%s -- %s\n", $a, length $val,
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join('', map {/[\0-\37]/? $_: "$_\b$_"} split(//, $val)),
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$val_orig;
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}
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}
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}
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}
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###############################################################################
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sub trim ($) {
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my($s) = @_;
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$s =~ s/^(?:\s|\ $re_end_entity)+//os;
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$s =~ s/(?:\s|\ $re_end_entity)+$//os;
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return $s;
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}
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###############################################################################
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sub text_extract (*) {
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my($h) = @_;
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my %text = ();
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for (;;) {
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my $s = next_token $h;
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last unless defined $s;
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my($kind, $t, $attr) = @$s; # FIXME
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if ($kind eq KIND_TEXT) {
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$t = trim $t;
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$text{$t} = 1 if $t =~ /\S/s;
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} elsif ($kind eq KIND_TAG && %$attr) {
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# value [tag=input], meta
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my $tag = lc($1) if $t =~ /^<(\S+)/s;
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for my $a ('alt', 'content', 'title', 'value') {
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if ($attr->{$a}) {
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next if $a eq 'content' && $tag ne 'meta';
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next if $a eq 'value' && ($tag ne 'input'
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|| (ref $attr->{'type'} && $attr->{'type'}->[1] eq 'hidden')); # FIXME
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my($key, $val, $val_orig, $order) = @{$attr->{$a}}; #FIXME
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$val = trim $val;
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$text{$val} = 1 if $val =~ /\S/s;
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}
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}
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}
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}
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# Emit all extracted strings. Don't emit pure whitespace or pure numbers.
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for my $t (keys %text) {
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printf "%s\n", $t
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unless $t =~ /^(?:\s|\ $re_end_entity)*$/os || $t =~ /^\d+$/;
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}
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}
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###############################################################################
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sub usage ($) {
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my($exitcode) = @_;
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my $h = $exitcode? *STDERR: *STDOUT;
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print $h <<EOF;
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Usage: $0 [OPTIONS]
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Extract strings from HTML file.
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--debug-dump-only Do not extract strings; but display scanned tokens
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-f, --file=FILE Extract from the specified FILE
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--pedantic-warnings Issue warnings even for detected problems which
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are likely to be harmless
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--help Display this help and exit
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EOF
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exit($exitcode);
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}
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###############################################################################
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sub usage_error (;$) {
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print STDERR "$_[0]\n" if @_;
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print STDERR "Try `$0 --help' for more information.\n";
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exit(-1);
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}
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###############################################################################
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GetOptions(
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'f|file=s' => \$input,
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'debug-dump-only' => \$debug_dump_only_p,
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'pedantic-warnings' => sub { $pedantic_p = 1 },
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'help' => sub { usage(0) },
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) || usage_error;
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usage_error('Missing mandatory option -f') unless defined $input;
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open(INPUT, "<$input") || die "$0: $input: $!\n";
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if ($debug_dump_only_p) {
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debug_dump(*INPUT);
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} else {
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text_extract(*INPUT);
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}
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warn "Warning: This input will not work with Mozilla standards-compliant mode\n"
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if $syntaxerror_p;
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close INPUT;
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exit(-1) if $fatal_p;
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