Template Parser Class Improvement

[eluser]GDmac - expocom[/eluser]
Hello all. I've made a mashup of the various versions in this thread
Template Parser Extended is attached to this post.
@dmyers, ignore and ignore_pre tags are added.

the parser_test.php controller has two fixme() tests.
<del>fixme1 shows a problem when a variable with the same name 'title' is stored before an array which also has an element named 'title'</del>.
fixme2 has to do with preg_match (which i know very little about). Stripping tags produces errors on javascript.

<del>Updated: version 0.4.1 attached.</del>
Updated: version 0.5.0 attached.)
- version 0.5.0 supports nested conditionals.

Please test, debug, audit. Hope it is usefull. Probably works in php5 only (can somebody test that?).

[pre] * Library: Extended Parser Class (2008-2010)
* Features: Parse templates, loaded as a view, and/or parse strings;
* Nested simple conditionals {if *}x{else}y{/if}.
* Nested conditionals (introduced in version 0.5.0);
* Array-element access; Successive same array usage;
* {Ignore} tag-pair protects a section from strip_vars but tags inside
* it are parsed. {Ignore_pre} is saved early on, and not parsed at all.
* You can use multiple ignore and ignore_pre tag-pairs.
* Tips: - Use Parse() to load a standard view with the php being processed.
* Parse_string() allows you, for instance, to build an email-message
* with simple template logic, or a partial view.
* - The cleanup unused tags option (strip_vars) is optional and should
* IMO be avoided. Better is to set all variables, be it empty. The parse
* will then automatically replace them with empties. Currently strip_vars
* generates a php error on various curly-brackets like inside javascript.
* For the time being, either protect javascript with ignore, or don't
* strip tags. Another reason to not strip_vars is, it also removes tags
* that might be in your data, like an article discussing parser {tags}.
* Version: 0.5.0
* Changes: 0.5.0 gdmac. nested conditionals. option (default) to convert
* delimiters inside data to hmtl-entities.
* 0.4.1 gdmac. fixme1 fixed, process all tag-pairs before singles.
* changed: remove ignore tags, even when strip_tags==false
* 0.4 gdmac. Mashup of parser versions, ignore tag, extra code and debug
* 0.3 rafsoaken. cleanup, test-suite, parse, array, booleans etc.
* 0.2 isaiahdw. conditionals
* 0.1 adamp1. cleanup unused tags and tag-pairs
* Todo: - To get this going, we need some nice documentation with it
* - set_options and better error-reporting and handling (malformed tags).
* - fix for stripping tags on curly brackets like in javascript
* - option to check for empty (next to isset)
* - conditional combinations {if {is_admin}==1 AND {username}==Tim}
* - general optimization and debugging
*
* Install: Put in /application/libraries/ as parser.php instead as MY_parser.php
* Since most methods of the class changed, it made sense to not extend
* the default parser anymore.
*
* Discuss: http://ellislab.com/forums/viewthread/68878/P45/
*
* usage: See the parser_test controller for some examples

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