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1
21
22 package org.lobobrowser.html.style;
23
24 import java.io.BufferedReader  ;
25 import java.io.IOException ;
26 import java.io.StringReader ;
27 import java.net.MalformedURLException ;
28 import java.net.URL ;
29 import java.util.*;
30 import java.util.logging.*;
31 import java.security.*;
32
33 import org.w3c.css.sac.InputSource;
34 import org.w3c.dom.css.CSSStyleSheet;
35 import org.w3c.dom.stylesheets.*;
36 import org.lobobrowser.html.*;
37 import org.lobobrowser.html.domimpl.HTMLDocumentImpl;
38 import org.lobobrowser.util.*;
39
40 import com.steadystate.css.dom.CSSStyleSheetImpl;
41 import com.steadystate.css.parser.CSSOMParser;
42
43 public class CSSUtilities {
44 private static final Logger logger = Logger.getLogger(CSSUtilities.class.getName());
45
46 private CSSUtilities() {
47 }
48
49 public static String preProcessCss(String text) {
50 try {
52 BufferedReader reader = new BufferedReader (new StringReader (text));
53 String line;
54 StringBuffer sb = new StringBuffer ();
55 while((line = reader.readLine()) != null) {
56 if(!line.trim().startsWith("//")) {
57 sb.append(line);
58 sb.append("\r\n");
59 }
60 }
61 return sb.toString();
62 } catch(IOException ioe) {
63 throw new IllegalStateException (ioe.getMessage());
65 }
66 }
67
68 public static InputSource getCssInputSourceForStyleSheet(String text) {
69 java.io.Reader reader = new StringReader (text);
70 InputSource is = new InputSource(reader);
71 return is;
72 }
73
74 public static CSSStyleSheet parse(String href, HTMLDocumentImpl doc, String baseUri, boolean considerDoubleSlashComments) throws MalformedURLException {
75 UserAgentContext bcontext = doc.getUserAgentContext();
76 final HttpRequest request = bcontext.createHttpRequest();
77 URL baseURL = new URL (baseUri);
78 URL scriptURL = Urls.createURL(baseURL, href);
79 final String scriptURI = scriptURL == null ? href : scriptURL.toExternalForm();
80 SecurityManager sm = System.getSecurityManager();
82 if(sm == null) {
83 request.open("GET", scriptURI, false);
84 }
85 else {
86 AccessController.doPrivileged(new PrivilegedAction() {
88 public Object run() {
89 request.open("GET", scriptURI, false);
90 return null;
91 }
92 });
93 }
94 int status = request.getStatus();
95 if(status != 200 && status != 0) {
96 logger.warning("Unable to parse CSS. URI=[" + scriptURI + "]. Response status was " + status + ".");
97 return null;
98 }
99
100 String text = request.getResponseText();
101 if(text != null && !"".equals(text)) {
102 String processedText = considerDoubleSlashComments ? preProcessCss(text) : text;
103 CSSOMParser parser = new CSSOMParser();
104 InputSource is = getCssInputSourceForStyleSheet(processedText);
105 is.setURI(scriptURI);
106 try {
107 CSSStyleSheetImpl sheet = (CSSStyleSheetImpl) parser.parseStyleSheet(is);
108 sheet.setHref(scriptURI);
109 return sheet;
110 } catch(Throwable err) {
111 logger.log(Level.WARNING,"Unable to parse CSS. URI=[" + scriptURI + "].", err);
112 return null;
113 }
114 }
115 else {
116 return null;
117 }
118 }
119
120 public static boolean matchesMedia(String mediaValues, HtmlRendererContext rcontext) {
121 if(mediaValues == null || mediaValues.length() == 0) {
122 return true;
123 }
124 if(rcontext == null) {
125 return false;
126 }
127 StringTokenizer tok = new StringTokenizer(mediaValues, ",");
128 while(tok.hasMoreTokens()) {
129 String token = tok.nextToken().trim();
130 String mediaName = Strings.trimForAlphaNumDash(token);
131 if(rcontext.isMedia(mediaName)) {
132 return true;
133 }
134 }
135 return false;
136 }
137
138 public static boolean matchesMedia(MediaList mediaList, HtmlRendererContext rcontext) {
139 if(mediaList == null) {
140 return true;
141 }
142 int length = mediaList.getLength();
143 if(length == 0) {
144 return true;
145 }
146 if(rcontext == null) {
147 return false;
148 }
149 for(int i = 0; i < length; i++) {
150 String mediaName = mediaList.item(i);
151 if(rcontext.isMedia(mediaName)) {
152 return true;
153 }
154 }
155 return false;
156 }
157
158 }
159 |
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