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class-get-post-parser.php
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class-get-post-parser.php
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<?php
/* Copyright 2011 James Tatum (email : [email protected])
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
if ( !class_exists('PluginGetPostParser') )
{
/**
* Parser for options passed in a parser tag type thing. The idea
* is to take a parser tag like [tag a b=val c="multi word val"]
* and to parse that out into an associative key-value array.
*/
class PluginGetPostParser
{
/**
* Read some options from a string and return an associative array.
*
* Test values:
* ' tag="doesn't exist"'
* ' tag=asdf'
* ' category="Uncategorized"'
* ' tag=1234 category="Some category" test test2'
* ' '
* ''
*/
public function parse_params($params)
{
$options = array();
$re_keys = '/[a-zA-Z0-9]/';
// Loop through supplied params and put them in the $options
// associative array.
// This for loop doesn't go through each character - there is
// a lot of manipulation of $i inside the loop, and several
// while loops. Each nested while loop must take care to test
// that the end of the string hasn't been reached.
for ( $i=0; $i<strlen( $params ); $i++ )
{
$key = '';
if ( preg_match($re_keys, $params[$i]) )
{
// Read out a key
while ( $i < strlen($params) &&
preg_match($re_keys, $params[$i]) )
{
$key .= $params[$i];
$i++;
}
}
if ( $i == strlen($params) )
{
// Reached the end of the params after reading a key
break;
}
if ( $params[$i] == ' ')
{
// Space character - if we have a key, set it as a flag
if ( $key != '' )
{
$options[$key] = 1;
}
continue;
}
if ( $params[$i] == '=' )
{
// We have a value. Let's handle it.
// Skip the =.
$i++;
$value = '';
if ( $params[$i] == '"' )
{
// Spaced value. Let's read data until we get to a
// closing quote.
// Skip the opening quote
$i++;
while ( $i < strlen($params) && $params[$i] != '"' )
{
$value .= $params[$i];
$i++;
}
// Skip the closing quote
$i++;
$options[$key] = $value;
} else {
// Must be an unspaced value.
while ( $i < strlen($params) && $params[$i] != ' ' )
{
$value .= $params[$i];
$i++;
}
$options[$key] = $value;
}
}
}
// Done iterating. Handle a case where there's a flag at the end
// and no space, such as [get-post test]
if ( isset($key) && !isset($options[$key]) && $key != '' )
{
$options[$key] = 1;
}
return $options;
}
}
}