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+#!/usr/bin/perl
+#
+# hindent 1.1.2
+#
+# Properly indent HTML code and convert tags to uppercase like the Gods intended.
+# Understands all nesting tags defined under the HTML 3.2 standard.
+#
+# by Paul Balyoz <pab@domtools.com>
+#
+# Usage:
+# hindent [-fslcv] [-i num] [file ...] > newfile
+#
+# Options:
+# -f Flow - just prints tags _without_args_, for visual checking.
+# NOTE: This option DAMAGES the HTML code. The output is for
+# human debugging use ONLY. Keep your original file!!
+# -s Strict - prints 1 tag per line with proper indenting.
+# Helpful for deciphering HTML code that's all on one line.
+# NOTE: This slightly DAMAGES the HTML code because it introduces
+# whitespace around tags that had none before, which will mess up
+# formatting somewhat on the page (links will have extra spaces, etc).
+# -i num Set indentation to this many characters.
+# -l List all the tags we recognize and exit.
+# -c Lowercase HTML tags. (Uppercase is default)
+# -v Print version of hindent and exit.
+#
+# Copyright (C) 1993-1999 Paul A. Balyoz <pab@domtools.com>
+#
+# 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.
+#
+
+
+# How many spaces to indent per level?
+# (sets of 8-spaces will be automatically converted to tabs intelligently).
+# You can use any value here, some recommendations: 8, 4, 3, or 2
+$spacesperlevel = 2;
+
+# How many spaces does a "tab" occupy on your screen?
+# Unix generally uses 8-space-tabs, but it's user-configurable in most editors.
+# If tabs are not turned off (-t0) then we output 1 tab character for every
+# $tabstop spaces we need to output.
+$tabstop = 8;
+
+# Tags that require their own end tag <TAG>...</TAG> we will nest them
+# properly: (WARNING, you must use lower-case here)
+# All other tags (not on this list) will be ignored for indenting purposes.
+%nesttag = (
+ 'html' => 1,
+ 'head' => 1,
+ 'body' => 1,
+ 'title' => 1,
+
+ 'a' => 1,
+
+ 'table' => 1,
+ 'tr' => 1,
+ 'th' => 1,
+ 'td' => 1,
+
+ 'form' => 1,
+ 'select' => 1,
+ 'textarea' => 1,
+
+# 'p' => 1, Don't do this one because many people use <P> but not </P>
+ 'ul' => 1,
+ 'ol' => 1,
+ 'dl' => 1,
+ 'blockquote' => 1,
+ 'center' => 1,
+ 'div' => 1,
+
+ 'font' => 1,
+ 'pre' => 1,
+ 'tt' => 1,
+ 'i' => 1,
+ 'b' => 1,
+ 'u' => 1,
+ 'strike' => 1,
+ 'big' => 1,
+ 'small' => 1,
+ 'sub' => 1,
+ 'sup' => 1,
+ 'em' => 1,
+ 'strong' => 1,
+ 'dfn' => 1,
+ 'code' => 1,
+ 'samp' => 1,
+ 'kbd' => 1,
+ 'var' => 1,
+ 'cite' => 1,
+
+ 'h1' => 1,
+ 'h2' => 1,
+ 'h3' => 1,
+ 'h4' => 1,
+ 'h5' => 1,
+ 'h6' => 1,
+
+ 'applet' => 1,
+
+ 'map' => 1,
+
+ 'frameset' => 1,
+ 'noframes' => 1,
+);
+
+
+#-------------------\
+# END CONFIGURATIONS ===================================================================
+#-------------------/
+
+use Getopt::Std;
+
+
+#
+# Parse args
+#
+
+sub usageexit {
+ print STDERR "usage: hindent [-fslcv] [-i num] [-t num] [file ...] > newfile\n";
+ exit 1;
+}
+
+getopts('fsi:lvt:c') || &usageexit;
+if (defined $opt_i) {
+ if ($opt_i < 0 || $opt_i > 10) {
+ print STDERR "$0: error: indentation factor '$opt_i' not in range 0..10.\n";
+ &usageexit;
+ } else {
+ $spacesperlevel = $opt_i;
+ }
+}
+if (defined $opt_t) {
+ if ($opt_t < 0 || $opt_t > 12) {
+ print STDERR "$0: error: indentation factor '$opt_i' not in range 0..12.\n";
+ &usageexit;
+ } else {
+ $tabstop = $opt_t;
+ }
+}
+
+
+#
+# If -l option, just list tags and exit.
+#
+
+if ($opt_l) {
+ print "hindent recognizes these HTML tags:\n";
+ for $tag (sort(keys(%nesttag))) {
+ $tag =~ tr/a-z/A-Z/;
+ print "$tag\n";
+ }
+ exit 0;
+}
+
+
+#
+# If -v option, just print version and exit.
+#
+
+if ($opt_v) {
+ print "hindent version 1.1.2\n";
+ exit 0;
+}
+
+
+#
+# Main HTML parsing code
+#
+
+$level = 0; # indentation level
+$changelevel = 0; # change in indentation level (delta)
+$out = ""; # accumulated output string
+while (<>) {
+ chomp; # some HTML has no newline on last line, chop mangles it.
+ s/^\s+//; # remove ALL preceding whitespace, we rebuild it ourselves
+ $line++;
+
+ $end = -1;
+ $start = $len = 0;
+ while (/<(.*?)>/g) {
+ $end = $start+$len-1; # of previous values
+ $start = length($`);
+ $len = 1 + length($1) + 1;
+ ($tag,$arg) = split(/\s+/,$1,2);
+ if (!$opt_f) {
+ $out .= substr($_, $end+1, $start-($end+1)); # print stuff from last tag to here
+ }
+ if ($opt_c) {
+ $tag =~ tr/A-Z/a-z/;
+ } else {
+ $tag =~ tr/a-z/A-Z/;
+ }
+ if ($arg && !$opt_f) {
+ $out .= "<$tag $arg>";
+ } else {
+ $out .= "<$tag>";
+ }
+
+ # if regular tag, push it on stack; if end-tag, pop it off stack.
+ # but don't do any of this if it's not a special "nesting" tag!
+ if ($tag !~ m,^/,) {
+ if ($nesttag{lc($tag)}) {
+ push @tagstack,$tag;
+ $changelevel++; # remember how much for later
+ }
+ } else {
+ $tag =~ s,^/,,; # convert this end-tag to a begin-tag
+ $tag = lc($tag);
+ if ($nesttag{lc($tag)}) {
+ # throw away tags until we find a match
+ if ($#tagstack > -1) {
+ while ($tag ne lc(pop @tagstack)) {
+ $changelevel--; # we threw away extra tags
+ last if $#tagstack <= 0;
+ }
+ $changelevel--; # we threw away extra tags
+ if ($level+$changelevel < 0) {
+ print STDERR "line $line: saw more end tags than begin ones!\n";
+ $changelevel = -$level;
+ }
+ }
+ }
+ }
+ &printout if $opt_s; # -s -> print every tag on new line
+ }
+
+ #
+ # Print rest of line after the last match, and newline.
+ # (not part of Flow)
+ #
+ if (!$opt_f) {
+ $end = $start+$len-1;
+ $out .= substr($_,$end+1,length($_)-($end+1));
+ }
+
+ &printout;
+}
+
+# Any tags left on the stack?
+if ($level > 0) {
+ print STDERR "WARNING: level=$level, ", $#tagstack+1," tags left on stack after done parsing! Specifically:\n";
+ while ($tag = pop @tagstack) {
+ print STDERR "\t$tag";
+ }
+}
+
+exit 0;
+
+
+#
+# Print this line of data indented properly.
+#
+sub printout {
+ my($numtabs) = 0;
+
+ #
+ # To OUTdent, do that BEFORE printing.
+ #
+ if ($changelevel < 0) {
+ $level += $changelevel;
+ $changelevel = 0;
+ }
+
+ #
+ # Print indents and this line of output
+ #
+ $spaces = " " x ($level * $spacesperlevel);
+ $numtabs = int(length($spaces)/$tabstop) if $tabstop;
+ print "\t" x $numtabs; # print the tabs
+ print " " x (length($spaces)-$numtabs*$tabstop); # print the spaces
+ print "$out\n";
+ $out = "";
+
+ #
+ # To INdent, do that AFTER printing.
+ #
+ if ($changelevel > 0) {
+ $level += $changelevel;
+ $changelevel = 0;
+ }
+}