Source code: jpicedt/format/pstricks/parser/PSTColorExpression.java
1 /* jPicEdt version 1.3.2, a picture editor for LaTeX.
2 Copyright (C) 1999-2002 Sylvain Reynal
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17
18 Sylvain Reynal
19 Département de Physique
20 Ecole Nationale Supérieure de l'Electronique et de ses Applications (ENSEA)
21 6, avenue du Ponceau
22 95014 CERGY CEDEX
23 FRANCE
24
25 Tel : 00 +33 130 736 245
26 Fax : 00 +33 130 736 667
27 e-mail : reynal@ensea.fr
28 jPicEdt web page : http://www.jpicedt.org
29 */
30
31 package jpicedt.format.pstricks.parser;
32
33 import jpicedt.graphic.io.parser.*;
34 import jpicedt.format.pstricks.PstricksUtilities;
35 import jpicedt.graphic.model.*;
36
37 import java.awt.*;
38 import java.util.*;
39
40 /**
41 * Used by PSTParametersExpression to parse statements involving colours, for instance
42 * "linecolor=green" (predefined colour) or "fillcolor=MyGray" (user-defined colours).
43 * <p>
44 * If no pstricks's native colour matches the RHS, we fetch a HashMap from the Pool's hashtable
45 * (value associated with key PstricksParser.KEY_USER_COLOURS) and look up the given colour ;
46 * this HashMap may've been filled by UserDefinedColorExpression in the course of the parsing process.
47 * @author $Author: reynal $
48 * @version $Id: PSTColorExpression.java,v 1.2 2002/08/05 16:44:10 reynal Exp $
49 *
50 */
51 public class PSTColorExpression extends SequenceExpression {
52
53 private Pool pool;
54 private PicAttributeName attribute;
55 private Pool.Key setKey;
56
57 /**
58 * @param pl parser's pool
59 * @param tag LHS tag (e.g. "linecolor" or "fillcolor") for the StatementExpression
60 * @param attribute name of attribute to modify (must be a predefined PicAttributeName of type "Color")
61 * @param attributeSetKey used to fetch the attribute set in which parsed parameters are stored.
62 */
63 public PSTColorExpression(Pool pl, String tag, PicAttributeName attributeName, Pool.Key attributeSetKey){
64
65 super(false); // doesn't throw IncompleteSequenceException (which means that there might be nothing b/w [ and ])
66
67 pool = pl;
68 attribute = attributeName;
69 this.setKey = attributeSetKey;
70
71 add(new LiteralExpression(tag+"=")); // e.g. "linecolor"
72 add(new ParseColorValue());
73 }
74
75 private class ParseColorValue extends WordExpression {
76 public ParseColorValue(){
77 // no postfix, swallows as many letters-or-digit as possible (since user-defined colours may contain digits)
78 super(null,false,true,true);
79 }
80 public void action(ParserEvent e){
81 if (DEBUG) System.out.println(e);
82 String colourStr = (String)(e.getValue());
83 //System.out.println("!!!!!!!!!!!!!!!!!!!! FOUND COLOR : " + colourStr);
84 Color colour = PstricksUtilities.getPsTricksColor(colourStr);
85 if (colour == null) { // if not a native colour, look up hashtable
86 HashMap userColoursMap = (HashMap)pool.get(PstricksParser.KEY_USER_COLOURS);
87 colour = (Color)(userColoursMap.get(colourStr));
88 if (colour == null) // if nor a native colour, nor a user-defined colour, default to black...
89 colour = Color.black;
90 }
91 pool.setAttribute(setKey,attribute, colour);
92 }
93 }
94 } // class
95