<?php
+/**
+ * Parser to extract query parameters out of REQUEST_URI paths.
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
/**
* PathRouter class.
* This class can take patterns such as /wiki/$1 and use them to
* the relevant contents
* - The default behavior is equivalent to `array( 'title' => '$1' )`,
* if you don't want the title parameter you can explicitly use `array( 'title' => false )`
- * - You can specify a value that won't have replacements in it
+ * - You can specify a value that won't have replacements in it
* using `'foo' => array( 'value' => 'bar' );`
*
* Options:
* @author Daniel Friesen
*/
class PathRouter {
+
+ /**
+ * @var array
+ */
+ private $patterns = array();
+
+ /**
+ * Protected helper to do the actual bulk work of adding a single pattern.
+ * This is in a separate method so that add() can handle the difference between
+ * a single string $path and an array() $path that contains multiple path
+ * patterns each with an associated $key to pass on.
+ * @param $path string
+ * @param $params array
+ * @param $options array
+ * @param $key null|string
+ */
protected function doAdd( $path, $params, $options, $key = null ) {
+ // Make sure all paths start with a /
if ( $path[0] !== '/' ) {
$path = '/' . $path;
}
}
}
+ // If 'title' is not specified and our path pattern contains a $1
+ // Add a default 'title' => '$1' rule to the parameters.
if ( !isset( $params['title'] ) && strpos( $path, '$1' ) !== false ) {
$params['title'] = '$1';
}
+ // If the user explicitly marked 'title' as false then omit it from the matches
if ( isset( $params['title'] ) && $params['title'] === false ) {
unset( $params['title'] );
}
+ // Loop over our parameters and convert basic key => string
+ // patterns into fully descriptive array form
foreach ( $params as $paramName => $paramData ) {
if ( is_string( $paramData ) ) {
if ( preg_match( '/\$(\d+|key)/u', $paramData ) ) {
}
}
+ // Loop over our options and convert any single value $# restrictions
+ // into an array so we only have to do in_array tests.
foreach ( $options as $optionName => $optionData ) {
if ( preg_match( '/^\$\d+$/u', $optionName ) ) {
if ( !is_array( $optionData ) ) {
/**
* Add a new path pattern to the path router
*
- * @param $path The path pattern to add
- * @param $params The params for this path pattern
- * @param $options The options for this path pattern
+ * @param $path string|array The path pattern to add
+ * @param $params array The params for this path pattern
+ * @param $options array The options for this path pattern
*/
public function add( $path, $params = array(), $options = array() ) {
if ( is_array( $path ) ) {
/**
* Add a new path pattern to the path router with the strict option on
* @see self::add
+ * @param $path string|array
+ * @param $params array
+ * @param $options array
*/
public function addStrict( $path, $params = array(), $options = array() ) {
$options['strict'] = true;
$this->add( $path, $params, $options );
}
+ /**
+ * Protected helper to re-sort our patterns so that the most specific
+ * (most heavily weighted) patterns are at the start of the array.
+ */
protected function sortByWeight() {
$weights = array();
foreach( $this->patterns as $key => $pattern ) {
array_multisort( $weights, SORT_DESC, SORT_NUMERIC, $this->patterns );
}
- public static function makeWeight( $pattern ) {
+ /**
+ * @param $pattern object
+ * @return float|int
+ */
+ protected static function makeWeight( $pattern ) {
# Start with a weight of 0
$weight = 0;
/**
* Parse a path and return the query matches for the path
*
- * @param $path The path to parse
+ * @param $path string The path to parse
* @return Array The array of matches for the path
*/
public function parse( $path ) {
+ // Make sure our patterns are sorted by weight so the most specific
+ // matches are tested first
$this->sortByWeight();
-
+
$matches = null;
foreach ( $this->patterns as $pattern ) {
}
}
+ // We know the difference between null (no matches) and
+ // array() (a match with no data) but our WebRequest caller
+ // expects array() even when we have no matches so return
+ // a array() when we have null
return is_null( $matches ) ? array() : $matches;
}
+ /**
+ * @param $path string
+ * @param $pattern string
+ * @return array|null
+ */
protected static function extractTitle( $path, $pattern ) {
+ // Convert the path pattern into a regexp we can match with
$regexp = preg_quote( $pattern->path, '#' );
+ // .* for the $1
$regexp = preg_replace( '#\\\\\$1#u', '(?P<par1>.*)', $regexp );
+ // .+ for the rest of the parameter numbers
$regexp = preg_replace( '#\\\\\$(\d+)#u', '(?P<par$1>.+?)', $regexp );
$regexp = "#^{$regexp}$#";
$matches = array();
$data = array();
+ // Try to match the path we were asked to parse with our regexp
if ( preg_match( $regexp, $path, $m ) ) {
+ // Ensure that any $# restriction we have set in our {$option}s
+ // matches properly here.
foreach ( $pattern->options as $key => $option ) {
if ( preg_match( '/^\$\d+$/u', $key ) ) {
$n = intval( substr( $key, 1 ) );
$value = rawurldecode( $m["par{$n}"] );
if ( !in_array( $value, $option ) ) {
+ // If any restriction does not match return null
+ // to signify that this rule did not match.
return null;
}
}
}
+ // Give our $data array a copy of every $# that was matched
foreach ( $m as $matchKey => $matchValue ) {
if ( preg_match( '/^par\d+$/u', $matchKey ) ) {
$n = intval( substr( $matchKey, 3 ) );
$data['$'.$n] = rawurldecode( $matchValue );
}
}
+ // If present give our $data array a $key as well
if ( isset( $pattern->key ) ) {
$data['$key'] = $pattern->key;
}
+ // Go through our parameters for this match and add data to our matches and data arrays
foreach ( $pattern->params as $paramName => $paramData ) {
$value = null;
+ // Differentiate data: from normal parameters and keep the correct
+ // array key around (ie: foo for data:foo)
if ( preg_match( '/^data:/u', $paramName ) ) {
$isData = true;
$key = substr( $paramName, 5 );
}
if ( isset( $paramData['value'] ) ) {
+ // For basic values just set the raw data as the value
$value = $paramData['value'];
} elseif ( isset( $paramData['pattern'] ) ) {
+ // For patterns we have to make value replacements on the string
$value = $paramData['pattern'];
- foreach ( $m as $matchKey => $matchValue ) {
- if ( preg_match( '/^par\d+$/u', $matchKey ) ) {
- $n = intval( substr( $matchKey, 3 ) );
- $value = str_replace( '$' . $n, rawurldecode( $matchValue ), $value );
- }
- }
+ $replacer = new PathRouterPatternReplacer;
+ $replacer->params = $m;
if ( isset( $pattern->key ) ) {
- $value = str_replace( '$key', $pattern->key, $value );
+ $replacer->key = $pattern->key;
}
- if ( preg_match( '/\$(\d+|key)/u', $value ) ) {
- // Still contains $# or $key patterns after replacement
- // Seams like we don't have all the data, abort
+ $value = $replacer->replace( $value );
+ if ( $value === false ) {
+ // Pattern required data that wasn't available, abort
return null;
}
}
+ // Send things that start with data: to $data, the rest to $matches
if ( $isData ) {
$data[$key] = $value;
} else {
}
}
+ // If this match includes a callback, execute it
if ( isset( $pattern->options['callback'] ) ) {
call_user_func_array( $pattern->options['callback'], array( &$matches, $data ) );
}
} else {
+ // Our regexp didn't match, return null to signify no match.
return null;
}
+ // Fall through, everything went ok, return our matches array
return $matches;
}
}
+
+class PathRouterPatternReplacer {
+
+ public $key, $params, $error;
+
+ /**
+ * Replace keys inside path router patterns with text.
+ * We do this inside of a replacement callback because after replacement we can't tell the
+ * difference between a $1 that was not replaced and a $1 that was part of
+ * the content a $1 was replaced with.
+ * @param $value string
+ * @return string
+ */
+ public function replace( $value ) {
+ $this->error = false;
+ $value = preg_replace_callback( '/\$(\d+|key)/u', array( $this, 'callback' ), $value );
+ if ( $this->error ) {
+ return false;
+ }
+ return $value;
+ }
+
+ /**
+ * @param $m array
+ * @return string
+ */
+ protected function callback( $m ) {
+ if ( $m[1] == "key" ) {
+ if ( is_null( $this->key ) ) {
+ $this->error = true;
+ return '';
+ }
+ return $this->key;
+ } else {
+ $d = $m[1];
+ if ( !isset( $this->params["par$d"] ) ) {
+ $this->error = true;
+ return '';
+ }
+ return rawurldecode( $this->params["par$d"] );
+ }
+ }
+
+}
dépôts / lhc / web / wiklou.git / blobdiff