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##---------------------------------------------------------------------------
## File:
## @(#) sgml.pl 1.3 96/09/30 @(#)
## Author:
## Earl Hood, ehood@medusa.acs.uci.edu
##---------------------------------------------------------------------------
## Copyright (C) 1994-1996 Earl Hood, ehood@medusa.acs.uci.edu
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
##---------------------------------------------------------------------------##
{
package sgml;
$VERSION = '1.0.0';
$namechars = '\w.-';
## Callback functions
$EndTagFunc = '';
$DeclFunc = '';
$CommentFunc = '';
$CdataFunc = '';
$OpenTagFunc = '';
$ProcInsFunc = '';
}
##---------------------------------------------------------------------------
## SGMLread_sgml() reads SGML markup. A callback is called when
## the following occurs:
##
## o An open tag: &$OpenTagFunc($gi, $attribute_list)
## o An end tag: &$EndTagFunc($gi)
## o A comment: &$CommentFunc(*comment_text);
## o Processing instruction:
## &$ProcInsFunc(*pi_text);
## o Character data: &$CdataFunc(*cdata);
##
## Argument descriptions:
## $handle : Filehandle containing the SGML instance.
##
## Notes:
## o read_sgml() is not intended to parse a DTD, or an
## SGML declaration statement, '<!SGML ...>'. It is
## designed to parse SGML instances. If a "<!" sequence
## is encountered (and not part of a comment declaration,
## read_sgml() tries to ignore the declaration.
##
## o Marked sections are not recognized.
##
## o The $CdataFunc may be called consective times for the
## a contiguous character data segment.
##
sub SGMLread_sgml {
package sgml;
local($handle) = shift;
local($data,
$tmp,
$char,
$txt,
$gi,
$left,
$oldhandle,
$oldds);
$oldhandle = select($handle);
$oldds = $/;
$data = '';
PSGML: while (!eof($handle)) {
$txt = '';
$/ = "<";
$data = <$handle>;
$left = chop $data;
&$CdataFunc(*data) if defined (&$CdataFunc);
$char = getc($handle);
if ($char eq '!') { ## Declaration
$char = getc($handle);
if ($char eq '-') {
$char = getc($handle);
while (1) {
$/ = ">";
$tmp = <$handle>;
last if $tmp =~ s/--\s*>$//o;
$txt .= $tmp;
}
$txt .= $tmp;
&$CommentFunc(*txt) if defined (&$CommentFunc);
} else {
$/ = ">";
$txt = <$handle>;
chop $txt;
&$DeclFunc(*txt) if defined (&$DeclFunc);
}
next PSGML;
}
if ($char eq '?') { ## Processing instruction
$/ = ">";
$txt = <$handle>;
chop $txt;
&$ProcInsFunc(*txt) if defined (&$ProcInsFunc);
next PSGML;
}
if ($char eq '/') { ## End tag
$/ = ">";
$txt = <$handle>;
$txt =~ s/[^$namechars]//go;
&$EndTagFunc($txt) if defined (&$EndTagFunc);
next PSGML;
}
if ($char =~ /[$namechars]/o) { ## Open tag
$gi = $char;
while (($char = getc($handle)) =~ /[$namechars]/o) {
$gi .= $char;
}
if ($char ne '>') {
while (!eof($handle)) {
$/ = ">";
$txt .= <$handle>;
last if (&close_notin_lit($txt));
}
chop $txt;
}
&$OpenTagFunc($gi, $txt) if defined (&$OpenTagFunc);
next PSGML;
}
&$CdataFunc(*left) if defined (&$CdataFunc);
} ## End of parse loop
$/ = $oldds;
select($oldhandle);
}
##---------------------------------------------------------------------------##
## Private functions
##---------------------------------------------------------------------------##
package sgml;
##----------------------------------------------------------------------
## Function to check if string has a literla that is open.
## The function returns 1 if it is not. Else it returns 0.
##
sub close_notin_lit {
local($str) = ($_[0]);
local($lit, $after);
while ($str =~ /(['"])/) {
$lit = $1;
$after = $';
if (($lit eq '"' ? ($after =~ /(")/) :
($after =~ /(')/)) ) {
$str = $';
} else {
return 0;
}
}
1;
}
##---------------------------------------------------------------------------##
1;
|
