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|
#!/usr/bin/perl
########################################################################
# sgmlspl: a simple SGML postprocesser for the SGMLS and NSGMLS
# parsers (requires SGMLS.pm library).
#
# Copyright (c) 1995 by David Megginson <dmeggins@aix1.uottawa.ca>
#
# 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.
#
# $Log: sgmlspl.pl,v $
# Revision 1.8 1995/12/03 21:46:31 david
# Eliminated all use of the SGMLS_Event::key method.
#
# Revision 1.7 1995/11/15 20:22:24 david
# Changed "use Output" to "use SGMLS::Output". Qualified the STDIN
# filehandle for the SGMLS object with the main:: package name.
#
# Revision 1.6 1995/08/12 16:15:14 david
# Revised version for 1.01 distribution.
#
# Revision 1.5 1995/04/27 11:52:25 david
# Changed 'print' to 'main::output' for re handler; empty string
# translates into an empty sub {} rather than a sub printing an empty
# string; instead of evaluating every argument as a perl script, take
# only the first as a perl script and the rest as its arguments; allow
# empty scripts or scripts which do not end with '1;'; pass the event
# itself as the second argument to each handler, after the event data.
#
# Revision 1.4 1995/04/23 14:44:58 david
# Use the Output package. Fixed the $version variable.
#
# Revision 1.3 1995/04/22 21:02:49 david
# Added some missing 'last SWITCH;' statements in the sgmls function.
#
# Revision 1.2 1995/04/22 20:58:48 david
# Added $SGMLS_PL::version variable and changed SDATA notation from
# [SDATA] to |SDATA|.
#
# Revision 1.1 1995/04/22 14:40:50 david
# Initial revision
#
########################################################################
use SGMLS::Output;
package SGMLS_PL;
use SGMLS;
$version = '$Id: sgmlspl.pl,v 1.8 1995/12/03 21:46:31 david Exp $';
#
# Set up handler defaults.
#
$start_document_handler = sub {};
$end_document_handler = sub {};
$start_element_handlers = { '' => sub {} };
$end_element_handlers = { '' => sub {} };
$cdata_handler = sub { main::output($_[0]); };
$sdata_handlers = { '' => sub { main::output($_[0]);} };
$re_handler = sub { main::output("\n"); };
$pi_handler = sub { '' => sub {} };
$entity_handlers = { '' => sub {} };
$start_subdoc_handlers = { '' => sub {} };
$end_subdoc_handlers = { '' => sub {} };
$conforming_handler = sub {};
#
# Main access point: declare handlers for different SGML events.
#
# Usage: sgml(event, handler);
#
# The event may be one of the following strings, or a special pattern.
# The generic events are as follow:
#
# 'start' The beginning of the document.
# 'end' The end of the document.
# 'start_element' The beginning of an element.
# 'end_element' The end of an element.
# 'cdata' Regular character data.
# 'sdata' Special system-specific data.
# 're' A record-end.
# 'pi' A processing instruction.
# 'entity' An external-entity reference.
# 'start_subdoc' The beginning of a subdocument entity.
# 'end_subdoc' The end of a subdocument entity.
# 'conforming' The document is conforming.
#
# In addition to these generic events, it is possible to handlers
# for certain specific, named events, as follow:
#
# '<GI>' The beginning of element GI.
# '</GI>' The end of element GI.
# '[SDATA]' The system-specific data SDATA.
# '&ENAME;' A reference to the external entity ENAME.
# '{ENAME}' The beginning of the subdocument-entity ENAME.
# '{/ENAME}' The end of the subdocument-entity ENAME.
#
#
# The handler may be a string, which will simply be printed when the
# event occurs (this is usually useful only for the specific, named
# events), or a reference to an anonymous subroutine, which will
# receive two arguments: the event data and the event itself. For
# example,
#
# sgml('<FOO>', "\n\\begin{foo}\n");
#
# and
#
# sgml('<FOO>', sub { output("\n\\begin{foo}\n"); });
#
# will have identical results.
#
sub main::sgml {
my ($spec,$handler) = (@_);
if (ref($handler) ne 'CODE') {
$handler =~ s/\\/\\\\/g;
$handler =~ s/'/\\'/g;
if ($handler eq '') {
$handler = sub {};
} else {
$handler = eval "sub { main::output('$handler'); };";
}
}
SWITCH: {
# start-document handler
$spec eq 'start' && do {
$start_document_handler = $handler;
last SWITCH;
};
# end-document handler
$spec eq 'end' && do {
$end_document_handler = $handler;
last SWITCH;
};
# start-element handler
$spec =~ /^<([^\/].*|)>$/ && do {
$start_element_handlers->{$1} = $handler;
last SWITCH;
};
# generic start-element handler
$spec eq 'start_element' && do {
$start_element_handlers->{''} = $handler;
last SWITCH;
};
# end-element handler
$spec =~ /^<\/(.*)>$/ && do {
$end_element_handlers->{$1} = $handler;
last SWITCH;
};
# generic end-element handler
$spec =~ 'end_element' && do {
$end_element_handlers->{''} = $handler;
last SWITCH;
};
# cdata handler
$spec eq 'cdata' && do {
$cdata_handler = $handler;
last SWITCH;
};
# sdata handler
$spec =~ /^\|(.*)\|$/ && do {
$sdata_handlers->{$1} = $handler;
last SWITCH;
};
# generic sdata handler
$spec eq 'sdata' && do {
$sdata_handlers->{''} = $handler;
last SWITCH;
};
# record-end handler
$spec eq 're' && do {
$re_handler = $handler;
last SWITCH;
};
# processing-instruction handler
$spec eq 'pi' && do {
$pi_handler = $handler;
last SWITCH;
};
# entity-reference handler
$spec =~ /^\&(.*);$/ && do {
$entity_handlers->{$1} = $handler;
last SWITCH;
};
# generic entity-reference handler
$spec eq 'entity' && do {
$entity_handlers->{''} = $handler;
last SWITCH;
};
# start-subdoc handler
$spec =~ /^\{([^\/].*|)\}$/ && do {
$start_subdoc_handlers->{$1} = $handler;
last SWITCH;
};
# generic start-subdoc handler
$spec eq 'start_subdoc' && do {
$start_subdoc_handlers->{''} = $handler;
last SWITCH;
};
# end-subdoc handler
$spec =~ /^\{\/(.*)\}$/ && do {
$end_subdoc_handlers->{$1} = $handler;
last SWITCH;
};
# generic end-subdoc handler
$spec eq 'end_subdoc' && do {
$end_subdoc_handlers->{''} = $handler;
last SWITCH;
};
# conforming handler
$spec eq 'conforming' && do {
$conforming_handler = $handler;
last SWITCH;
};
die "Bad SGML handler pattern: $spec\n";
}
}
#
# The first argument on the command line is a perl module which will be
# read here and evaluated in the 'main' package -- everything else will
# be an argument to it.
#
package main;
$ARGV = shift;
unless ($ARGV eq '' || do $ARGV) {
if (!-e $ARGV) {
die "FATAL: $ARGV does not exist.\n";
} elsif (!-r $ARGV) {
die "FATAL: $ARGV exists but is read-protected.\n";
} elsif ($@) {
die "FATAL: $@\n";
}
}
#
# Do the actual work, using the SGMLS package.
#
package SGMLS_PL;
$parse = new SGMLS(main::STDIN); # a new parse object
&{$start_document_handler}(); # run the start handler.
# run the appropriate handler for each
# event
while ($event = $parse->next_event) {
my $type = $event->type;
SWITCH: {
$type eq 'start_element' && do {
&{($start_element_handlers->{$event->data->name}||
$start_element_handlers->{''} || sub {})}($event->data,$event);
last SWITCH;
};
$type eq 'end_element' && do {
&{($end_element_handlers->{$event->data->name}||
$end_element_handlers->{''} || sub {})}($event->data,$event);
last SWITCH;
};
$type eq 'cdata' && do {
&{$cdata_handler}($event->data,$event);
last SWITCH;
};
$type eq 'sdata' && do {
&{($sdata_handlers->{$event->data}||
$sdata_handlers->{''} || sub {})}($event->data,$event);
last SWITCH;
};
$type eq 're' && do {
&{$re_handler}($event->data,$event);
last SWITCH;
};
$type eq 'pi' && do {
&{$pi_handler}($event->data,$event);
last SWITCH;
};
$type eq 'entity' && do {
&{($entity_handlers->{$event->data->name}||
$entity_handlers->{''} || sub {})}($event->data,$event);
last SWITCH;
};
$type eq 'start_subdoc' && do {
&{($start_subdoc_handlers->{$event->data->name}||
$start_subdoc_handlers->{''} || sub {})}($event->data,$event);
last SWITCH;
};
$type eq 'end_subdoc' && do {
&{($end_subdoc_handlers->{$event->data->name}||
$end_subdoc_handlers->{''} || sub {})}($event->data,$event);
last SWITCH;
};
$type eq 'conforming' && do {
&{$conforming_handler}($event->data,$event);
last SWITCH;
};
die "Unknown SGML event type: $type\n";
}
}
&{$end_document_handler}(); # run the end handler
|
