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wp-content/plugins/posts-to-posts/scb/QueryManipulation.php

@@ -0,0 +1,93 @@
+<?php
+
+class scbQueryManipulation {
+
+	private $bits = array();
+	private $wp_query;
+
+	private static $filters = array(
+		'posts_where',
+		'posts_join',
+		'posts_groupby',
+		'posts_orderby',
+		'posts_distinct',
+		'post_limits',
+		'posts_fields'
+	);
+
+	public function __construct( $callback, $once = true ) {
+		global $wp_version;
+
+		if ( version_compare( $wp_version, '3.1-alpha', '>=' ) ) {
+			if ( !$once ) {
+				add_filter( 'posts_clauses', $callback, 10, 2 );
+				return;
+			}
+		}
+
+		$this->callback = $callback;
+
+		$this->enable();
+
+		if ( $once )
+			add_filter( 'posts_request', array( $this, '_disable' ) );
+	}
+
+	function _disable( $request ) {
+		remove_filter( 'posts_request', array( $this, '_disable' ) );
+
+		$this->disable();
+
+		return $request;
+	}
+
+	public function enable() {
+		foreach ( self::$filters as $filter ) {
+			add_filter( $filter, array( $this, 'collect' ), 999, 2 );
+			add_filter( $filter . '_request' , array( $this, 'update' ), 9 );
+		}
+
+		add_action( 'posts_selection' , array( $this, 'alter' ) );
+	}
+
+	public function disable() {
+		foreach ( self::$filters as $filter ) {
+			remove_filter( $filter, array( $this, 'collect' ), 999, 2 );
+			remove_filter( $filter . '_request' , array( $this, 'update' ), 9 );
+		}
+
+		remove_action( 'posts_selection' , array( $this, 'alter' ) );
+	}
+
+	function collect( $value, $wp_query ) {
+		// remove 'posts_'
+		$key = explode( '_', current_filter() );
+		$key = array_slice( $key, 1 );
+		$key = implode( '_', $key );
+
+		$this->bits[ $key ] = $value;
+
+		$this->wp_query = $wp_query;
+
+		return $value;
+	}
+
+	function alter( $query ) {
+		// suppress_filters => true
+		if ( is_null( $this->wp_query ) ) {
+			return;
+		}
+
+		$this->bits = call_user_func( $this->callback, $this->bits, $this->wp_query );
+	}
+
+	function update( $value ) {
+		// remove 'posts_' and '_request'
+		$key = explode( '_', current_filter() );
+		$key = array_slice( $key, 1, -1 );
+		$key = implode( '_', $key );
+
+		return $this->bits[ $key ];
+	}
+}
+