#!/usr/bin/env ruby

=begin rdoc

== match_parens - find mismatches of parentheses, braces, (angle) brackets, in texts

== Synopsis

	match_parens [_filename_]

== Description

Mismatches of parentheses, braces, (angle) brackets, especially in TeX
sources which may be rich in those, may be difficult to trace. This
little script helps you by writing your text to standard output, after
adding a left margin to your text, which will normally be almost empty,
but will clearly show any mismatches. (Just try me on myself to see that
the parenthesis starting this sentence will not appear to be matched at
the end of the file. If you look at me in the vim editor, try the command
:%!%

=== Copyright

Copyright (C) 2009 Wybo Dekker (<tt>wybo@servalys.nl</tt>)

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 3 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, see http://www.gnu.org/licenses.

=end

RELEASE = 1.2

html = false
parens = '^{}[]()'
s,n = '','0'
while gets()
   if html
      if ~/^=end/ || ~/<\/html>/i 
         html = false
         parens = '^{}[]()'
      end
   else
      if ~/^=begin rdoc/ || ~/\<html\>/i
         html = true
         parens = '^{}[]()<>'
      end
   end
   # look for <> in html or rdoc:
   s << $_.tr(parens,'')
   while s.gsub!(/\{\}|\(\)|\[\]|<>/,'') do end
   puts [n.next!,s,$_].join("\t")
end
# $Id: match_parens,v 1.4 2009-10-06 20:02:46 wybo Exp $