org.jgrapht.io.DOTUtils Maven / Gradle / Ivy
/*
* (C) Copyright 2003-2017, by Christoph Zauner and Contributors.
*
* JGraphT : a free Java graph-theory library
*
* This program and the accompanying materials are dual-licensed under
* either
*
* (a) the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation, or (at your option) any
* later version.
*
* or (per the licensee's choosing)
*
* (b) the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation.
*/
package org.jgrapht.io;
import java.util.regex.*;
/**
* Class with DOT format related utilities.
*
* @author Christoph Zauner
*/
class DOTUtils
{
/** Keyword for representing strict graphs. */
static final String DONT_ALLOW_MULTIPLE_EDGES_KEYWORD = "strict";
/** Keyword for directed graphs. */
static final String DIRECTED_GRAPH_KEYWORD = "digraph";
/** Keyword for undirected graphs. */
static final String UNDIRECTED_GRAPH_KEYWORD = "graph";
/** Edge operation for directed graphs. */
static final String DIRECTED_GRAPH_EDGEOP = "->";
/** Edge operation for undirected graphs. */
static final String UNDIRECTED_GRAPH_EDGEOP = "--";
// patterns for IDs
private static final Pattern ALPHA_DIG = Pattern.compile("[a-zA-Z_][\\w]*");
private static final Pattern DOUBLE_QUOTE = Pattern.compile("\".*\"");
private static final Pattern DOT_NUMBER = Pattern.compile("[-]?([.][0-9]+|[0-9]+([.][0-9]*)?)");
private static final Pattern HTML = Pattern.compile("<.*>");
/**
* Test if the ID candidate is a valid ID.
*
* @param idCandidate the ID candidate.
*
* @return true if it is valid; false otherwise.
*/
static boolean isValidID(String idCandidate)
{
return ALPHA_DIG.matcher(idCandidate).matches()
|| DOUBLE_QUOTE.matcher(idCandidate).matches()
|| DOT_NUMBER.matcher(idCandidate).matches() || HTML.matcher(idCandidate).matches();
}
}
// End DOTUtils.java