| 1 | /* |
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| 2 | * This program is free software; you can redistribute it and/or modify |
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| 3 | * it under the terms of the GNU General Public License as published by |
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| 4 | * the Free Software Foundation; either version 2 of the License, or |
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| 5 | * (at your option) any later version. |
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| 6 | * |
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| 7 | * This program is distributed in the hope that it will be useful, |
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| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 10 | * GNU General Public License for more details. |
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| 11 | * |
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| 12 | * You should have received a copy of the GNU General Public License |
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| 13 | * along with this program; if not, write to the Free Software |
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| 14 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 15 | */ |
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| 16 | |
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| 17 | /* |
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| 18 | * DotParser.java |
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| 19 | * Copyright (C) 2003 University of Waikato, Hamilton, New Zealand |
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| 20 | * |
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| 21 | */ |
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| 22 | package weka.gui.graphvisualizer; |
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| 23 | |
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| 24 | import java.io.Reader; |
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| 25 | import java.io.StreamTokenizer; |
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| 26 | import java.io.BufferedReader; |
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| 27 | import java.io.IOException; |
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| 28 | import java.io.FileWriter; |
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| 29 | |
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| 30 | import weka.core.FastVector; |
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| 31 | import weka.gui.graphvisualizer.GraphNode; |
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| 32 | import weka.gui.graphvisualizer.GraphEdge; |
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| 33 | |
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| 34 | |
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| 35 | |
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| 36 | /** |
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| 37 | * This class parses input in DOT format, and |
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| 38 | * builds the datastructures that are passed to it. |
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| 39 | * It is NOT 100% compatible with the DOT format. The |
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| 40 | * GraphNode and GraphEdge classes do not have any provision |
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| 41 | * for dealing with different colours or shapes of nodes, |
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| 42 | * there can however, be a different label and ID for a |
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| 43 | * node. It also does not do anything for labels for |
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| 44 | * edges. However, this class won't crash or throw an |
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| 45 | * exception if it encounters any of the above |
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| 46 | * attributes of an edge or a node. This class however, |
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| 47 | * won't be able to deal with things like subgraphs and |
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| 48 | * grouping of nodes. |
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| 49 | * |
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| 50 | * @author Ashraf M. Kibriya (amk14@cs.waikato.ac.nz) |
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| 51 | * @version $Revision: 1.4 $ - 23 Apr 2003 - Initial version (Ashraf M. Kibriya) |
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| 52 | */ |
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| 53 | public class DotParser implements GraphConstants { |
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| 54 | |
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| 55 | /** These holds the nodes and edges of the graph */ |
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| 56 | protected FastVector m_nodes, m_edges; |
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| 57 | /** This is the input containing DOT stream to be parsed */ |
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| 58 | protected Reader m_input; |
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| 59 | /** This holds the name of the graph if there is any otherwise it is null */ |
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| 60 | protected String m_graphName; |
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| 61 | |
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| 62 | /** |
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| 63 | * |
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| 64 | * Dot parser Constructor |
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| 65 | * |
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| 66 | * @param input - The input, if passing in a string then |
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| 67 | * encapsulate that in String reader object |
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| 68 | * @param nodes - Vector to put in GraphNode objects, |
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| 69 | * corresponding to the nodes parsed in from |
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| 70 | * the input |
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| 71 | * @param edges - Vector to put in GraphEdge objects, |
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| 72 | * corresponding to the edges parsed in from |
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| 73 | * the input |
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| 74 | */ |
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| 75 | public DotParser(Reader input, FastVector nodes, FastVector edges) { |
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| 76 | m_nodes = nodes; m_edges = edges; |
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| 77 | m_input = input; |
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| 78 | } |
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| 79 | |
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| 80 | |
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| 81 | /** |
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| 82 | * This method parses the string or the InputStream that we |
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| 83 | * passed in through the constructor and builds up the |
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| 84 | * m_nodes and m_edges vectors |
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| 85 | * |
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| 86 | * @return - returns the name of the graph |
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| 87 | */ |
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| 88 | public String parse() { |
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| 89 | StreamTokenizer tk = new StreamTokenizer(new BufferedReader(m_input)); |
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| 90 | setSyntax(tk); |
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| 91 | |
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| 92 | graph(tk); |
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| 93 | |
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| 94 | return m_graphName; |
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| 95 | } |
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| 96 | |
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| 97 | |
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| 98 | /** |
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| 99 | * This method sets the syntax of the StreamTokenizer. |
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| 100 | * i.e. set the whitespace, comment and delimit chars. |
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| 101 | * |
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| 102 | */ |
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| 103 | protected void setSyntax(StreamTokenizer tk) { |
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| 104 | tk.resetSyntax(); |
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| 105 | tk.eolIsSignificant(false); |
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| 106 | tk.slashStarComments(true); |
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| 107 | tk.slashSlashComments(true); |
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| 108 | tk.whitespaceChars(0,' '); |
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| 109 | tk.wordChars(' '+1,'\u00ff'); |
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| 110 | tk.ordinaryChar('['); |
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| 111 | tk.ordinaryChar(']'); |
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| 112 | tk.ordinaryChar('{'); |
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| 113 | tk.ordinaryChar('}'); |
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| 114 | tk.ordinaryChar('-'); |
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| 115 | tk.ordinaryChar('>'); |
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| 116 | tk.ordinaryChar('/'); |
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| 117 | tk.ordinaryChar('*'); |
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| 118 | tk.quoteChar('"'); |
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| 119 | tk.whitespaceChars(';',';'); |
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| 120 | tk.ordinaryChar('='); |
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| 121 | } |
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| 122 | |
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| 123 | /************************************************************* |
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| 124 | * |
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| 125 | * Following methods parse the DOT input and mimic the DOT |
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| 126 | * language's grammar in their structure |
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| 127 | * |
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| 128 | ************************************************************* |
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| 129 | */ |
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| 130 | protected void graph(StreamTokenizer tk) { |
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| 131 | try { |
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| 132 | tk.nextToken(); |
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| 133 | |
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| 134 | if(tk.ttype==tk.TT_WORD) { |
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| 135 | if(tk.sval.equalsIgnoreCase("digraph")) { |
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| 136 | tk.nextToken(); |
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| 137 | if(tk.ttype==tk.TT_WORD) { |
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| 138 | m_graphName = tk.sval; |
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| 139 | tk.nextToken(); |
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| 140 | } |
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| 141 | |
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| 142 | while(tk.ttype!='{') { |
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| 143 | System.err.println("Error at line "+tk.lineno()+" ignoring token "+ |
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| 144 | tk.sval); |
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| 145 | tk.nextToken(); |
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| 146 | if(tk.ttype==tk.TT_EOF) |
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| 147 | return; |
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| 148 | } |
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| 149 | stmtList(tk); |
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| 150 | } |
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| 151 | else if(tk.sval.equalsIgnoreCase("graph")) |
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| 152 | System.err.println("Error. Undirected graphs cannot be used"); |
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| 153 | else |
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| 154 | System.err.println("Error. Expected graph or digraph at line "+ |
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| 155 | tk.lineno()); |
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| 156 | } |
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| 157 | } |
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| 158 | catch(Exception ex) { ex.printStackTrace(); } |
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| 159 | |
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| 160 | |
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| 161 | //int tmpMatrix[][] = new int[m_nodes.size()][m_nodes.size()]; |
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| 162 | //for(int i=0; i<m_edges.size(); i++) |
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| 163 | // tmpMatrix[((GraphEdge)m_edges.elementAt(i)).src] |
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| 164 | // [((GraphEdge)m_edges.elementAt(i)).dest] = |
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| 165 | // ((GraphEdge)m_edges.elementAt(i)).type; |
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| 166 | //for(int i=0; i<m_nodes.size(); i++) { |
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| 167 | // GraphNode n = (GraphNode)m_nodes.elementAt(i); |
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| 168 | // n.edges = tmpMatrix[i]; |
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| 169 | //} |
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| 170 | |
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| 171 | //Adding parents, and those edges to a node which are coming out from it |
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| 172 | int tmpEdges[], noOfEdgesOfNode[]=new int[m_nodes.size()]; |
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| 173 | int noOfPrntsOfNode[]=new int[m_nodes.size()]; |
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| 174 | for(int i=0; i<m_edges.size(); i++) { |
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| 175 | GraphEdge e = (GraphEdge)m_edges.elementAt(i); |
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| 176 | noOfEdgesOfNode[e.src]++; |
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| 177 | noOfPrntsOfNode[e.dest]++; |
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| 178 | } |
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| 179 | for(int i=0; i<m_edges.size(); i++) { |
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| 180 | GraphEdge e = (GraphEdge)m_edges.elementAt(i); |
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| 181 | GraphNode n = (GraphNode)m_nodes.elementAt(e.src); |
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| 182 | GraphNode n2 = (GraphNode)m_nodes.elementAt(e.dest); |
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| 183 | if(n.edges==null) { |
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| 184 | n.edges = new int[noOfEdgesOfNode[e.src]][2]; |
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| 185 | for(int k=0; k<n.edges.length; k++) |
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| 186 | n.edges[k][1]=0; |
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| 187 | } |
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| 188 | if(n2.prnts==null) { |
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| 189 | n2.prnts = new int[noOfPrntsOfNode[e.dest]]; |
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| 190 | for(int k=0; k<n2.prnts.length; k++) |
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| 191 | n2.prnts[k]=-1; |
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| 192 | } |
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| 193 | int k=0; |
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| 194 | while(n.edges[k][1]!=0) k++; |
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| 195 | n.edges[k][0] = e.dest; |
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| 196 | n.edges[k][1] = e.type; |
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| 197 | |
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| 198 | k=0; |
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| 199 | while(n2.prnts[k]!=-1) k++; |
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| 200 | n2.prnts[k] = e.src; |
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| 201 | } |
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| 202 | } |
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| 203 | |
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| 204 | |
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| 205 | protected void stmtList(StreamTokenizer tk) throws Exception{ |
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| 206 | tk.nextToken(); |
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| 207 | if(tk.ttype=='}' || tk.ttype==tk.TT_EOF) |
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| 208 | return; |
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| 209 | else { |
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| 210 | stmt(tk); |
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| 211 | stmtList(tk); |
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| 212 | } |
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| 213 | } |
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| 214 | |
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| 215 | |
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| 216 | protected void stmt(StreamTokenizer tk) { |
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| 217 | //tk.nextToken(); |
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| 218 | |
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| 219 | if(tk.sval.equalsIgnoreCase("graph") || tk.sval.equalsIgnoreCase("node") || |
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| 220 | tk.sval.equalsIgnoreCase("edge") ) |
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| 221 | ; //attribStmt(k); |
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| 222 | else { |
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| 223 | try { |
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| 224 | nodeID(tk); |
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| 225 | int nodeindex= m_nodes.indexOf(new GraphNode(tk.sval, null)); |
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| 226 | tk.nextToken(); |
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| 227 | |
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| 228 | if(tk.ttype == '[') |
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| 229 | nodeStmt(tk, nodeindex); |
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| 230 | else if(tk.ttype == '-') |
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| 231 | edgeStmt(tk, nodeindex); |
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| 232 | else |
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| 233 | System.err.println("error at lineno "+tk.lineno()+" in stmt"); |
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| 234 | } |
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| 235 | catch(Exception ex) { |
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| 236 | System.err.println("error at lineno "+tk.lineno()+" in stmtException"); |
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| 237 | ex.printStackTrace(); |
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| 238 | } |
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| 239 | } |
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| 240 | } |
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| 241 | |
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| 242 | |
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| 243 | protected void nodeID(StreamTokenizer tk) throws Exception{ |
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| 244 | |
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| 245 | if(tk.ttype=='"' || tk.ttype==tk.TT_WORD || (tk.ttype>='a' && tk.ttype<='z') |
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| 246 | || (tk.ttype>='A' && tk.ttype<='Z')) { |
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| 247 | if(m_nodes!=null && !(m_nodes.contains( new GraphNode(tk.sval, null))) ) { |
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| 248 | m_nodes.addElement( new GraphNode(tk.sval, tk.sval) ); |
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| 249 | //System.out.println("Added node >"+tk.sval+"<"); |
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| 250 | } |
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| 251 | } |
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| 252 | else |
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| 253 | { throw new Exception(); } |
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| 254 | |
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| 255 | //tk.nextToken(); |
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| 256 | } |
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| 257 | |
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| 258 | |
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| 259 | protected void nodeStmt(StreamTokenizer tk, final int nindex) |
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| 260 | throws Exception { |
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| 261 | tk.nextToken(); |
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| 262 | |
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| 263 | GraphNode temp = (GraphNode) m_nodes.elementAt(nindex); |
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| 264 | |
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| 265 | if(tk.ttype==']' || tk.ttype==tk.TT_EOF) |
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| 266 | return; |
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| 267 | else if(tk.ttype==tk.TT_WORD) { |
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| 268 | |
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| 269 | if(tk.sval.equalsIgnoreCase("label")) { |
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| 270 | |
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| 271 | tk.nextToken(); |
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| 272 | if(tk.ttype=='=') { |
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| 273 | tk.nextToken(); |
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| 274 | if(tk.ttype==tk.TT_WORD || tk.ttype=='"') |
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| 275 | temp.lbl = tk.sval; |
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| 276 | else { |
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| 277 | System.err.println("couldn't find label at line "+tk.lineno()); |
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| 278 | tk.pushBack(); |
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| 279 | } |
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| 280 | } |
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| 281 | else { |
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| 282 | System.err.println("couldn't find label at line "+tk.lineno()); |
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| 283 | tk.pushBack(); |
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| 284 | } |
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| 285 | } |
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| 286 | |
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| 287 | else if(tk.sval.equalsIgnoreCase("color")){ |
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| 288 | |
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| 289 | tk.nextToken(); |
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| 290 | if(tk.ttype=='=') { |
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| 291 | tk.nextToken(); |
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| 292 | if(tk.ttype==tk.TT_WORD || tk.ttype=='"') |
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| 293 | ; |
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| 294 | else { |
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| 295 | System.err.println("couldn't find color at line "+tk.lineno()); |
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| 296 | tk.pushBack(); |
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| 297 | } |
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| 298 | } |
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| 299 | else { |
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| 300 | System.err.println("couldn't find color at line "+tk.lineno()); |
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| 301 | tk.pushBack(); |
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| 302 | } |
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| 303 | } |
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| 304 | |
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| 305 | else if(tk.sval.equalsIgnoreCase("style")) { |
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| 306 | |
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| 307 | tk.nextToken(); |
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| 308 | if(tk.ttype=='=') { |
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| 309 | tk.nextToken(); |
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| 310 | if(tk.ttype==tk.TT_WORD || tk.ttype=='"') |
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| 311 | ; |
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| 312 | else { |
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| 313 | System.err.println("couldn't find style at line "+tk.lineno()); |
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| 314 | tk.pushBack(); |
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| 315 | } |
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| 316 | } |
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| 317 | else { |
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| 318 | System.err.println("couldn't find style at line "+tk.lineno()); |
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| 319 | tk.pushBack(); |
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| 320 | } |
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| 321 | } |
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| 322 | } |
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| 323 | nodeStmt(tk, nindex); |
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| 324 | } |
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| 325 | |
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| 326 | |
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| 327 | protected void edgeStmt(StreamTokenizer tk, final int nindex) |
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| 328 | throws Exception { |
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| 329 | tk.nextToken(); |
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| 330 | |
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| 331 | GraphEdge e=null; |
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| 332 | if(tk.ttype=='>') { |
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| 333 | tk.nextToken(); |
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| 334 | if(tk.ttype=='{') { |
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| 335 | while(true) { |
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| 336 | tk.nextToken(); |
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| 337 | if(tk.ttype=='}') |
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| 338 | break; |
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| 339 | else { |
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| 340 | nodeID(tk); |
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| 341 | e = new GraphEdge(nindex, |
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| 342 | m_nodes.indexOf( new GraphNode(tk.sval, null) ), |
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| 343 | DIRECTED); |
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| 344 | if( m_edges!=null && !(m_edges.contains(e)) ) { |
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| 345 | m_edges.addElement( e ); |
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| 346 | //System.out.println("Added edge from "+ |
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| 347 | // ((GraphNode)(m_nodes.elementAt(nindex))).ID+ |
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| 348 | // " to "+ |
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| 349 | // ((GraphNode)(m_nodes.elementAt(e.dest))).ID); |
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| 350 | } |
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| 351 | } |
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| 352 | } |
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| 353 | } |
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| 354 | else { |
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| 355 | nodeID(tk); |
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| 356 | e = new GraphEdge(nindex, |
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| 357 | m_nodes.indexOf( new GraphNode(tk.sval, null) ), |
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| 358 | DIRECTED); |
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| 359 | if( m_edges!=null && !(m_edges.contains(e)) ) { |
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| 360 | m_edges.addElement( e ); |
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| 361 | //System.out.println("Added edge from "+ |
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| 362 | // ((GraphNode)(m_nodes.elementAt(nindex))).ID+" to "+ |
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| 363 | // ((GraphNode)(m_nodes.elementAt(e.dest))).ID); |
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| 364 | } |
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| 365 | } |
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| 366 | } |
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| 367 | else if(tk.ttype=='-') { |
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| 368 | System.err.println("Error at line "+tk.lineno()+ |
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| 369 | ". Cannot deal with undirected edges"); |
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| 370 | if(tk.ttype==tk.TT_WORD) |
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| 371 | tk.pushBack(); |
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| 372 | return; |
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| 373 | } |
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| 374 | else { |
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| 375 | System.err.println("Error at line "+tk.lineno()+" in edgeStmt"); |
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| 376 | if(tk.ttype==tk.TT_WORD) |
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| 377 | tk.pushBack(); |
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| 378 | return; |
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| 379 | } |
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| 380 | |
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| 381 | tk.nextToken(); |
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| 382 | |
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| 383 | if(tk.ttype=='[') |
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| 384 | edgeAttrib(tk, e); |
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| 385 | else |
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| 386 | tk.pushBack(); |
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| 387 | } |
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| 388 | |
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| 389 | |
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| 390 | protected void edgeAttrib(StreamTokenizer tk, final GraphEdge e) |
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| 391 | throws Exception { |
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| 392 | tk.nextToken(); |
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| 393 | |
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| 394 | if(tk.ttype==']' || tk.ttype==tk.TT_EOF) |
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| 395 | return; |
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| 396 | else if(tk.ttype==tk.TT_WORD) { |
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| 397 | |
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| 398 | if(tk.sval.equalsIgnoreCase("label")) { |
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| 399 | |
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| 400 | tk.nextToken(); |
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| 401 | if(tk.ttype=='=') { |
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| 402 | tk.nextToken(); |
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| 403 | if(tk.ttype==tk.TT_WORD || tk.ttype=='"') |
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| 404 | System.err.println("found label "+tk.sval);//e.lbl = tk.sval; |
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| 405 | else { |
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| 406 | System.err.println("couldn't find label at line "+tk.lineno()); |
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| 407 | tk.pushBack(); |
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| 408 | } |
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| 409 | } |
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| 410 | else { |
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| 411 | System.err.println("couldn't find label at line "+tk.lineno()); |
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| 412 | tk.pushBack(); |
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| 413 | } |
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| 414 | } |
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| 415 | else if(tk.sval.equalsIgnoreCase("color")) { |
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| 416 | |
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| 417 | tk.nextToken(); |
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| 418 | if(tk.ttype=='=') { |
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| 419 | tk.nextToken(); |
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| 420 | if(tk.ttype==tk.TT_WORD || tk.ttype=='"') |
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| 421 | ; |
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| 422 | else { |
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| 423 | System.err.println("couldn't find color at line "+tk.lineno()); |
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| 424 | tk.pushBack(); |
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| 425 | } |
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| 426 | } |
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| 427 | else { |
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| 428 | System.err.println("couldn't find color at line "+tk.lineno()); |
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| 429 | tk.pushBack(); |
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| 430 | } |
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| 431 | } |
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| 432 | |
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| 433 | else if(tk.sval.equalsIgnoreCase("style")) { |
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| 434 | |
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| 435 | tk.nextToken(); |
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| 436 | if(tk.ttype=='=') { |
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| 437 | tk.nextToken(); |
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| 438 | if(tk.ttype==tk.TT_WORD || tk.ttype=='"') |
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| 439 | ; |
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| 440 | else { |
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| 441 | System.err.println("couldn't find style at line "+tk.lineno()); |
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| 442 | tk.pushBack(); |
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| 443 | } |
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| 444 | } |
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| 445 | else { |
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| 446 | System.err.println("couldn't find style at line "+tk.lineno()); |
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| 447 | tk.pushBack(); |
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| 448 | } |
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| 449 | } |
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| 450 | } |
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| 451 | edgeAttrib(tk, e); |
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| 452 | } |
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| 453 | |
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| 454 | |
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| 455 | /** |
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| 456 | * |
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| 457 | * This method saves a graph in a file in DOT format. |
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| 458 | * However, if reloaded in GraphVisualizer we would need |
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| 459 | * to layout the graph again. |
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| 460 | * |
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| 461 | * @param filename - The name of the file to write in. (will overwrite) |
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| 462 | * @param graphName - The name of the graph |
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| 463 | * @param nodes - Vector containing all the nodes |
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| 464 | * @param edges - Vector containing all the edges |
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| 465 | */ |
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| 466 | public static void writeDOT(String filename, String graphName, |
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| 467 | FastVector nodes, FastVector edges) { |
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| 468 | try { |
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| 469 | FileWriter os = new FileWriter(filename); |
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| 470 | os.write("digraph ", 0, ("digraph ").length()); |
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| 471 | if(graphName!=null) |
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| 472 | os.write(graphName+" ", 0, graphName.length()+1); |
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| 473 | os.write("{\n", 0, ("{\n").length()); |
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| 474 | |
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| 475 | GraphEdge e; |
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| 476 | for(int i=0; i<edges.size(); i++) { |
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| 477 | e = (GraphEdge) edges.elementAt(i); |
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| 478 | os.write(((GraphNode)nodes.elementAt(e.src)).ID, 0, |
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| 479 | ((GraphNode)nodes.elementAt(e.src)).ID.length()); |
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| 480 | os.write("->", 0, ("->").length() ); |
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| 481 | os.write(((GraphNode)nodes.elementAt(e.dest)).ID+"\n", |
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| 482 | 0, |
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| 483 | ((GraphNode)nodes.elementAt(e.dest)).ID.length()+1); |
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| 484 | } |
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| 485 | os.write("}\n", 0, ("}\n").length()); |
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| 486 | os.close(); |
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| 487 | } |
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| 488 | catch(IOException ex) { ex.printStackTrace(); } |
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| 489 | } |
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| 490 | |
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| 491 | } // DotParser |
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