graphviz.php

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            unset($this->graph['nodes'][$group][$name]);
        }
    }

    /**
     * Add an edge to the graph.
     *
     * Caveat! This cannot handle multiple identical edges. If you use non-numeric
     * IDs for the nodes, this will not do (too much) harm. For numeric IDs the
     * array_merge() that is used will change the keys when merging arrays, leading
     * to new nodes appearing in the graph.
     *
     * @param  array Start and End node of the edge.
     * @param  array Attributes of the edge.
     * @access public
     */
    function addEdge($edge, $attributes = array())
    {
        if (is_array($edge)) {
            $from = key($edge);
            $to   = $edge[$from];
            $id   = $from . '_' . $to;

            if (!isset($this->graph['edges'][$id])) {
                $this->graph['edges'][$id] = $edge;
            } else {
                $this->graph['edges'][$id] = array_merge(
                  $this->graph['edges'][$id],
                  $edge
                );
            }

            if (is_array($attributes)) {
                if (!isset($this->graph['edgeAttributes'][$id])) {
                    $this->graph['edgeAttributes'][$id] = $attributes;
                } else {
                    $this->graph['edgeAttributes'][$id] = array_merge(
                      $this->graph['edgeAttributes'][$id],
                      $attributes
                    );
                }
            }
        }
    }

    /**
     * Remove an edge from the graph.
     *
     * @param  array Start and End node of the edge to be removed.
     * @access public
     */
    function removeEdge($edge)
    {
        if (is_array($edge)) {
              $from = key($edge);
              $to   = $edge[$from];
              $id   = $from . '_' . $to;

            if (isset($this->graph['edges'][$id])) {
                unset($this->graph['edges'][$id]);
            }

            if (isset($this->graph['edgeAttributes'][$id])) {
                unset($this->graph['edgeAttributes'][$id]);
            }
        }
    }

    /**
     * Add attributes to the graph.
     *
     * @param  array Attributes to be added to the graph.
     * @access public
     */
    function addAttributes($attributes)
    {
        if (is_array($attributes)) {
            $this->graph['attributes'] = array_merge(
              $this->graph['attributes'],
              $attributes
            );
        }
    }

    /**
     * Set attributes of the graph.
     *
     * @param  array Attributes to be set for the graph.
     * @access public
     */
    function setAttributes($attributes)
    {
        if (is_array($attributes)) {
            $this->graph['attributes'] = $attributes;
        }
    }

    /**
     * Set directed/undirected flag for the graph.
     *
     * @param  boolean Directed (TRUE) or undirected (FALSE) graph.
     * @access public
     */
    function setDirected($directed)
    {
        if (is_bool($directed)) {
            $this->graph['directed'] = $directed;
        }
    }

    /**
     * Load graph from file.
     *
     * @param  string  File to load graph from.
     * @access public
     */
    function load($file)
    {
        if ($serializedGraph = implode('', @file($file))) {
            $this->graph = unserialize($serializedGraph);
        }
    }

    /**
     * Save graph to file.
     *
     * @param  string  File to save the graph to.
     * @return mixed   File the graph was saved to, FALSE on failure.
     * @access public
     */
    function save($file = '')
    {
        $serializedGraph = serialize($this->graph);

        if (empty($file)) {
            $file = System::mktemp('graph_');
        }

        if ($fp = @fopen($file, 'w')) {
            @fputs($fp, $serializedGraph);
            @fclose($fp);

            return $file;
        }

        return FALSE;
    }

    /**
     * Parse the graph into GraphViz markup.
     *
     * @return string  GraphViz markup
     * @access public
     */
    function parse()
    {
        if (isset($this->graph['name']) && is_string($this->graph['name'])) {
            $parsedGraph = "digraph " . $this->graph['name'] . " {\n";
        } else {
            $parsedGraph = "digraph G {\n";
        }

        if (isset($this->graph['attributes'])) {
            foreach ($this->graph['attributes'] as $key => $value) {
                $attributeList[] = $key . '="' . $value . '"';
            }

            if (!empty($attributeList)) {
                $parsedGraph .= 'graph [ '.implode(',', $attributeList) . " ];\n";
            }
        }

        if (isset($this->graph['nodes'])) {
            foreach($this->graph['nodes'] as $group => $nodes) {
                if ($group != 'default') {
                    $parsedGraph .= sprintf(
                      "subgraph \"cluster_%s\" {\nlabel=\"%s\";\n",

                      $group,
                      isset($this->graph['clusters'][$group]) ? $this->graph['clusters'][$group]['title'] : ''
                    );

                    if (isset($this->graph['clusters'][$group]['attributes'])) {
                        unset($attributeList);

                        foreach ($this->graph['clusters'][$group]['attributes'] as $key => $value) {
                            $attributeList[] = $key . '="' . $value . '"';
                        }

                        if (!empty($attributeList)) {
                            $parsedGraph .= implode(',', $attributeList) . ";\n";
                        }
                    }
                }

                foreach($nodes as $node => $attributes) {
                    unset($attributeList);

                    foreach($attributes as $key => $value) {
                        $attributeList[] = $key . '="' . $value . '"';
                    }

                    if (!empty($attributeList)) {
                        $parsedGraph .= sprintf(
                          "\"%s\" [ %s ];\n",
                          addslashes(stripslashes($node)),
                          implode(',', $attributeList)
                        );
                    }
                }

                if ($group != 'default') {
                  $parsedGraph .= "}\n";
                }
            }
        }

        if (isset($this->graph['edges'])) {
            foreach($this->graph['edges'] as $label => $node) {
                unset($attributeList);

                $from = key($node);
                $to   = $node[$from];

                foreach($this->graph['edgeAttributes'][$label] as $key => $value) {
                    $attributeList[] = $key . '="' . $value . '"';
                }

                $parsedGraph .= sprintf(
                  '"%s" -> "%s"',
                  addslashes(stripslashes($from)),
                  addslashes(stripslashes($to))
                );
                
                if (!empty($attributeList)) {
                    $parsedGraph .= sprintf(
                      ' [ %s ]',
                      implode(',', $attributeList)
                    );
                }

                $parsedGraph .= ";\n";
            }
        }

        return $parsedGraph . "}\n";
    }

    /**
     * Save GraphViz markup to file.
     *
     * @param  string  File to write the GraphViz markup to.
     * @return mixed   File to which the GraphViz markup was
     *                 written, FALSE on failure.
     * @access public
     */
    function saveParsedGraph($file = '')
    {
        $parsedGraph = $this->parse();

        if (!empty($parsedGraph)) {
            if (empty($file)) {
                $file = System::mktemp('graph_');
            }

            if ($fp = @fopen($file, 'w')) {
                @fputs($fp, $parsedGraph);
                @fclose($fp);

                return $file;
            }
        }

        return FALSE;
    }
}

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * c-hanging-comment-ender-p: nil
 * End:
 */
?>