* Deprecate parseTokens in favour of a parse-as-you-go approach, faster and uses less memory.
* Display variables in lower_case so they aren't SHOUTING_AT_PEOPLE.
* Tell people if they try to use variables that don't exist, rather than silently returning NULL.
* Use strcspn to scan ahead for long regions of uninteresting text in string handling (performance).
* Remove cruft specific to my system in phpTest.php.
* Remove a test that was in incorrect syntax, and useless without adding variable support.
I've made it more performant and fixed a few bugs by using regexes
instead of PHP loops, where possible, under the assumption that the
PCRE parser is more efficient than the same thing implemented in pure PHP.
Also, I'm now passing the same string around and calculating offsets, which
Tim tells me is far more performant than continually truncating the same string.
All tests still pass, with the exception of string.t, which I've modified
to remove the offending code, which never worked.
* Fix some notices
* Add if-then-else and ternary operator
* Fix ordering of operators
* Skip whitespace.t till test runner will be fixed
* Still lacks dates and correct Unicode string handling
* Re-add, per Brion's request.
* Add an easy PHP tester, to run the tests used for the native parser.
* Update to pass 20 tests out of 27. Still to go:
** Implement dates.
** Fix order of operations.
** Fix backslash parsing.
** Implement if-then-else and ternery operator.
* Reimplement tools, starting with a spiffy AJAX expression tester. Didn't bother implementing as non-AJAX, as it's just an extra.
* Change exchange protocol between native parser and PHP app. Resulted in 2-3-fold performance boost.
* Fix minor bug from last night.
* Introduce a syntax check on-save.
* Introduce filter history (requires DB schema change).
* Deprecate now non-working /tools interface (will come back).
* Revert r38187 for now:
** Introduced a memory leak.
** Used an unnecessary library. The point is taken, and this will be fixed in a few days (using glibc instead).
* Fix logic error in boolean ops.
* Integrate with the PHP abuse filter using AbuseFilterParserNative class.
* Fix memory leak.
* Fix a few miscellaneous bugs
