function by_expression($expression)
{
// build a queue of expression tokens
$tokens = self::tokenise($expression);
$matched_tokens = array();
foreach ($tokens as $key => $token) {
// try to match token type (order matters)
if (IntervalFilter::match($token) === true) {
$matched_tokens[] = new IntervalFilter();
} elseif (CommandFilter::match($token) === true) {
$matched_token[] = new CommandFilter();
} elseif (DateFilter::match($token) === true) {
$matched_tokens[] = new DateFilter();
} elseif (RangeFilter::match($token) === true) {
$matched_tokens[] = new RangeFilter();
} elseif (WordFilter::match($token) === true) {
$matched_tokens[] = new WordFilter();
}
}
$last_token = $matched_tokens[$key];
if ($last_token instanceof DateTokenFilter) {
$last_token->group_dates(true);
}
$tasks = $this->_data->tasks;
$token_filter = new TokenFilter();
foreach ($matched_tokens as $token_filter) {
$token_filter->filter_by($tasks);
}
// TODO: sort and group?
return $tasks;
}
