1 /*
2 * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package javafx.css;
27
28 import com.sun.javafx.css.Combinator;
29
30 import java.io.DataInputStream;
31 import java.io.DataOutputStream;
32 import java.io.IOException;
33 import java.util.ArrayList;
34 import java.util.List;
35 import java.util.Set;
36
37 /**
38 * Used by CSSRule to determine whether or not the selector applies to a
39 * given object.
40 *
41 * @since 9
42 */
43 abstract public class Selector {
44
45 private static class UniversalSelector {
46 private static final Selector INSTANCE =
47 new SimpleSelector("*", null, null, null);
48 }
49
50 static Selector getUniversalSelector() {
51 return UniversalSelector.INSTANCE;
52 }
53
54 private Rule rule;
55 void setRule(Rule rule) {
56 this.rule = rule;
57 }
58 public Rule getRule() {
59 return rule;
60 }
61
62 private int ordinal = -1;
63 public void setOrdinal(int ordinal) {
64 this.ordinal = ordinal;
65 }
66 public int getOrdinal() {
67 return ordinal;
68 }
69
70 public abstract Match createMatch();
71
72 // same as the matches method expect return true/false rather than a match
73 public abstract boolean applies(Styleable styleable);
74
75 // same as applies, but will return pseudoclass state that it finds along the way
76 public abstract boolean applies(Styleable styleable, Set<PseudoClass>[] triggerStates, int bit);
77
78 /**
79 * Determines whether the current state of the node and its parents
80 * matches the pseudo-classes defined (if any) for this selector.
81 */
82 public abstract boolean stateMatches(Styleable styleable, Set<PseudoClass> state);
83
84 private static final int TYPE_SIMPLE = 1;
85 private static final int TYPE_COMPOUND = 2;
86
87 protected void writeBinary(DataOutputStream os, StyleConverter.StringStore stringStore)
88 throws IOException {
89 if (this instanceof SimpleSelector) {
90 os.writeByte(TYPE_SIMPLE);
91 } else {
92 os.writeByte(TYPE_COMPOUND);
93 }
94 }
95
96 static Selector readBinary(int bssVersion, DataInputStream is, String[] strings)
97 throws IOException {
98 final int type = is.readByte();
99 if (type == TYPE_SIMPLE)
100 return SimpleSelector.readBinary(bssVersion, is,strings);
101 else
102 return CompoundSelector.readBinary(bssVersion, is,strings);
103 }
104
105 public static Selector createSelector(final String cssSelector) {
106 if (cssSelector == null || cssSelector.length() == 0) {
107 return null; // actually return a default no-match selector
108 }
109
110 // A very primitive parser
111 List<SimpleSelector> selectors = new ArrayList<SimpleSelector>();
112 List<Combinator> combinators = new ArrayList<Combinator>();
113 List<String> parts = new ArrayList<String>();
114 int start = 0;
115 int end = -1;
116 char combinator = '\0';
117 for (int i=0; i<cssSelector.length(); i++) {
118 char ch = cssSelector.charAt(i);
119 if (ch == ' ') {
120 if (combinator == '\0') {
121 combinator = ch;
122 end = i;
123 }
124 } else if (ch == '>') {
125 if (combinator == '\0') end = i;
126 combinator = ch;
127 } else if (combinator != '\0'){
128 parts.add(cssSelector.substring(start, end));
129 start = i;
130 combinators.add(combinator == ' ' ? Combinator.DESCENDANT : Combinator.CHILD);
131 combinator = '\0';
132 }
133 }
134 parts.add(cssSelector.substring(start));
135
136 for (int i=0; i<parts.size(); i++) {
137 final String part = parts.get(i);
138 if (part != null && !part.equals("")) {
139 // Now we have the parts, we can split off the pseudo classes
140 String[] pseudoClassParts = part.split(":");
141 List<String> pseudoClasses = new ArrayList<String>();
142 for (int j=1; j<pseudoClassParts.length; j++) {
143 if (pseudoClassParts[j] != null && !pseudoClassParts[j].equals("")) {
144 pseudoClasses.add(pseudoClassParts[j].trim());
145 }
146 }
147
148 // Now that we've read off the pseudo classes, we can go ahead and pull
149 // apart the beginning.
150 final String selector = pseudoClassParts[0].trim();
151 // There might be style classes, so lets peel those off next
152 String[] styleClassParts = selector.split("\\.");
153 List<String> styleClasses = new ArrayList<String>();
154
155 // If the first one is an empty string, then it started with a pseudo class
156 // If the first one starts with a #, it was an id
157 // Otherwise, it was a name
158 for (int j=1; j<styleClassParts.length; j++) {
159 if (styleClassParts[j] != null && !styleClassParts[j].equals("")) {
160 styleClasses.add(styleClassParts[j].trim());
161 }
162 }
163 String name = null, id = null;
164 if (styleClassParts[0].equals("")) {
165 // Do nothing!
166 } else if (styleClassParts[0].charAt(0) == '#') {
167 id = styleClassParts[0].substring(1).trim();
168 } else {
169 name = styleClassParts[0].trim();
170 }
171
172 selectors.add(new SimpleSelector(name, styleClasses, pseudoClasses, id));
173 }
174 }
175
176 if (selectors.size() == 1) {
177 return selectors.get(0);
178 } else {
179 return new CompoundSelector(selectors, combinators);
180 }
181 }
182
183 }