Java CSSReader类代码示例

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
public String process( String input )
{
	CascadingStyleSheet css = CSSReader.readFromString( input, CCharset.CHARSET_UTF_8_OBJ, ECSSVersion.CSS30 );

	CascadingStyleSheet out = new CascadingStyleSheet();
	for( ICSSTopLevelRule rule : css.getAllRules() )
	{
		ICSSTopLevelRule outRule = filterRule( rule );
		if( outRule != null )
			out.addRule( outRule );
	}

	CSSWriterSettings settings = new CSSWriterSettings( ECSSVersion.CSS30, true );
	settings.setRemoveUnnecessaryCode( true );
	return new CSSWriter( settings ).getCSSAsString( out );
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
/**
 * Get the rewritten version of the passed CSS code. This is done by
 * interpreting the CSS and than writing it again with the passed settings.
 * This can e.g. be used to create a compressed version of a CSS.
 *
 * @param sOriginalCSS
 *        The original CSS code to be compressed.
 * @param aSettings
 *        The CSS writer settings to use. The version is used to read the
 *        original CSS.
 * @return If compression failed because the CSS is invalid or whatsoever, the
 *         original CSS is returned, else the rewritten version is returned.
 */
@Nonnull
public static String getRewrittenCSS (@Nonnull final String sOriginalCSS, @Nonnull final CSSWriterSettings aSettings)
{
  ValueEnforcer.notNull (sOriginalCSS, "OriginalCSS");
  ValueEnforcer.notNull (aSettings, "Settings");

  final CascadingStyleSheet aCSS = CSSReader.readFromString (sOriginalCSS, aSettings.getVersion ());
  if (aCSS != null)
  {
    try
    {
      return new CSSWriter (aSettings).getCSSAsString (aCSS);
    }
    catch (final Exception ex)
    {
      s_aLogger.warn ("Failed to write optimized CSS!", ex);
    }
  }
  return sOriginalCSS;
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
/**
 * Utility method to convert a media query string to a structured list of
 * {@link CSSMediaQuery} objects.
 *
 * @param sMediaQuery
 *        The media query string to parse. May be <code>null</code>.
 * @param eVersion
 *        The CSS version to use. May not be <code>null</code>.
 * @return <code>null</code> if the passed media query is <code>null</code> or
 *         empty or not parsable.
 */
@Nullable
public static ICommonsList <CSSMediaQuery> parseToMediaQuery (@Nullable final String sMediaQuery,
                                                              @Nonnull final ECSSVersion eVersion)
{
  if (StringHelper.hasNoText (sMediaQuery))
    return null;

  final String sCSS = "@media " + sMediaQuery + " {}";
  final CascadingStyleSheet aCSS = CSSReader.readFromString (sCSS, eVersion);
  if (aCSS == null)
    return null;

  final CSSMediaRule aMediaRule = aCSS.getAllMediaRules ().get (0);
  return aMediaRule.getAllMediaQueries ();
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
@Test
public void test2 () throws ParseException
{
  final ParserCSS30TokenManager aTokenHdl = new ParserCSS30TokenManager (new CSSCharStream (new NonBlockingStringReader (CSS2)));
  aTokenHdl.setDebugStream (System.out);
  final ParserCSS30 aParser = new ParserCSS30 (aTokenHdl);
  aParser.disable_tracing ();
  final CSSNode aNode = aParser.styleSheet ();
  assertNotNull (aNode);

  final CascadingStyleSheet aCSS = CSSHandler.readCascadingStyleSheetFromNode (ECSSVersion.CSS30,
                                                                               aNode,
                                                                               CSSReader.getDefaultInterpretErrorHandler ());
  assertNotNull (aCSS);

  for (final ICSSTopLevelRule aTopLevelRule : aCSS.getAllFontFaceRules ())
    assertTrue (aCSS.removeRule (aTopLevelRule).isChanged ());
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
private void _testMe (@Nonnull final File aFile, @Nonnull final ECSSVersion eVersion)
{
  if (false)
    s_aLogger.info (aFile.getAbsolutePath ());

  // read and interpret
  final CascadingStyleSheet aCSS = CSSReader.readFromFile (aFile, StandardCharsets.UTF_8, eVersion);
  assertNotNull (aFile.getAbsolutePath (), aCSS);

  // Both normal and optimized!
  for (int i = 0; i < 2; ++i)
  {
    // write to buffer
    final String sCSS = new CSSWriter (eVersion, i == 1).getCSSAsString (aCSS);
    if (false)
      System.out.println ("--" + i + "--\n" + sCSS);

    // read again from buffer
    assertEquals (aFile.getAbsolutePath () +
                  (i == 0 ? " unoptimized" : " optimized"),
                  aCSS,
                  CSSReader.readFromString (sCSS, eVersion));
  }
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
@Test
public void testRead30Write21 () throws IOException
{
  for (final File aFile : new FileSystemRecursiveIterator (new File ("src/test/resources/testfiles/css30/good/artificial")).withFilter (IFileFilter.filenameEndsWith (".css")))
  {
    final String sKey = aFile.getAbsolutePath ();
    try
    {
      // read and interpret CSS 3.0
      final CascadingStyleSheet aCSS = CSSReader.readFromFile (aFile, StandardCharsets.UTF_8, ECSSVersion.CSS30);
      assertNotNull (sKey, aCSS);

      // write to CSS 2.1
      final NonBlockingStringWriter aSW = new NonBlockingStringWriter ();
      new CSSWriter (ECSSVersion.CSS21).writeCSS (aCSS, aSW);

      // This should throw an error
      fail (sKey + " should have thrown an exception but got: " + aSW.getAsString ());
    }
    catch (final IllegalStateException ex)
    {}
  }
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
@Test
public void testCompressCSS_Size ()
{
  final CascadingStyleSheet aCSS = CSSReader.readFromStream (new ClassPathResource ("/testfiles/css21/good/phloc/test/content.css"),
                                                             StandardCharsets.UTF_8,
                                                             ECSSVersion.CSS30);
  assertNotNull (aCSS);

  // Only whitespace optimization
  final CSSWriterSettings aSettings = new CSSWriterSettings (ECSSVersion.CSS21, true);
  String sContent = new CSSWriter (aSettings).getCSSAsString (aCSS);
  assertEquals (2846, sContent.length ());

  // Also remove empty declarations
  aSettings.setRemoveUnnecessaryCode (true);
  sContent = new CSSWriter (aSettings).getCSSAsString (aCSS);
  assertEquals (2839, sContent.length ());
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
@Test
public void testWriteCertainRules ()
{
  final CSSWriterSettings aSettings = new CSSWriterSettings (ECSSVersion.CSS30, true);
  aSettings.setWriteFontFaceRules (false);
  aSettings.setWriteKeyframesRules (false);
  aSettings.setWriteMediaRules (false);
  aSettings.setWritePageRules (false);
  final CSSWriter aWriter = new CSSWriter (aSettings).setWriteHeaderText (false);

  // Some non-special rules
  CascadingStyleSheet aCSS = CSSReader.readFromString (CSS3, ECSSVersion.CSS30);
  assertNotNull (aCSS);
  assertEquals ("h1{color:red;margin:1px}h2{color:rgb(1,2,3)}h3{}", aWriter.getCSSAsString (aCSS));

  // Only @media rule
  aCSS = CSSReader.readFromString (CSS4, ECSSVersion.CSS30);
  assertNotNull (aCSS);
  assertEquals ("", aWriter.getCSSAsString (aCSS));

  // Nothing special
  aCSS = CSSReader.readFromString (CSS5, ECSSVersion.CSS30);
  assertNotNull (aCSS);
  assertEquals ("h1{color:red;margin:1px}h2{color:red;margin:1px}", aWriter.getCSSAsString (aCSS));
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
public void readAllSelectors ()
{
  final String sStyle = "blockquote p,\r\n" +
                        "blockquote ul,\r\n" +
                        "blockquote ol {\r\n" +
                        "  line-height:normal;\r\n" +
                        "  font-style:italic;\r\n" +
                        "}\r\n" +
                        "\r\n" +
                        "a { color:#FFEA6F; }\r\n" +
                        "\r\n" +
                        "a:hover { text-decoration:none; }\r\n" +
                        "\r\n" +
                        "img { border:none; }";
  final CascadingStyleSheet aCSS = CSSReader.readFromString (sStyle, ECSSVersion.CSS30);
  final ICommonsList <String> aAllSelectors = new CommonsArrayList <> ();
  CSSVisitor.visitCSS (aCSS, new DefaultCSSVisitor ()
  {
    @Override
    public void onStyleRuleSelector (@Nonnull final CSSSelector aSelector)
    {
      aAllSelectors.add (aSelector.getAsCSSString (new CSSWriterSettings (ECSSVersion.CSS30)));
    }
  });
  System.out.println (aAllSelectors);
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
@Test
public void testIssue8 ()
{
  final IReadableResource aRes = new ClassPathResource ("testfiles/css30/good/issue8.css");
  assertTrue (aRes.exists ());
  final CascadingStyleSheet aCSS = CSSReader.readFromStream (aRes,
                                                             StandardCharsets.UTF_8,
                                                             ECSSVersion.CSS30,
                                                             new LoggingCSSParseErrorHandler ());
  assertNotNull (aCSS);

  assertEquals (1, aCSS.getStyleRuleCount ());
  final CSSStyleRule aStyleRule = aCSS.getStyleRuleAtIndex (0);
  assertNotNull (aStyleRule);

  assertEquals (4, aStyleRule.getDeclarationCount ());
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
@Test
public void testIssue ()
{
  // Multiple errors contained
  final IReadableResource aRes = new ClassPathResource ("testfiles/css30/good/issue21.css");
  assertTrue (aRes.exists ());
  final CascadingStyleSheet aCSS = CSSReader.readFromStream (aRes,
                                                             new CSSReaderSettings ().setFallbackCharset (StandardCharsets.UTF_8)
                                                                                     .setCustomErrorHandler (new LoggingCSSParseErrorHandler ())
                                                                                     .setBrowserCompliantMode (true));
  assertNotNull (aCSS);
  if (false)
    System.out.println (new CSSWriter (ECSSVersion.CSS30).getCSSAsString (aCSS));
  assertEquals (2, aCSS.getRuleCount ());
  assertEquals (2, aCSS.getStyleRuleCount ());
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
@Test
public void testIssue ()
{
  // Multiple errors contained
  final IReadableResource aRes = new ClassPathResource ("testfiles/css30/bad_but_browsercompliant/issue19.css");
  assertTrue (aRes.exists ());
  final CascadingStyleSheet aCSS = CSSReader.readFromStream (aRes,
                                                             new CSSReaderSettings ().setFallbackCharset (StandardCharsets.UTF_8)
                                                                                     .setCSSVersion (ECSSVersion.CSS30)
                                                                                     .setCustomErrorHandler (new LoggingCSSParseErrorHandler ())
                                                                                     .setBrowserCompliantMode (true));
  assertNotNull (aCSS);
  if (false)
    System.out.println (new CSSWriter (ECSSVersion.CSS30).getCSSAsString (aCSS));
  assertEquals (1, aCSS.getRuleCount ());
  assertEquals (1, aCSS.getStyleRuleCount ());
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
@Test
public void testVisitContent30 ()
{
  for (final File aFile : new FileSystemRecursiveIterator (new File ("src/test/resources/testfiles/css30/good")).withFilter (IFileFilter.filenameEndsWith (".css")))
  {
    final String sKey = aFile.getAbsolutePath ();
    if (true)
      s_aLogger.info (sKey);
    final CascadingStyleSheet aCSS = CSSReader.readFromFile (aFile,
                                                             new CSSReaderSettings ().setFallbackCharset (StandardCharsets.UTF_8)
                                                                                     .setCSSVersion (ECSSVersion.CSS30)
                                                                                     .setCustomErrorHandler (new LoggingCSSParseErrorHandler ())
                                                                                     .setBrowserCompliantMode (true));
    assertNotNull (sKey, aCSS);
    CSSVisitor.visitCSSUrl (aCSS, new MockUrlVisitor (sKey));
  }
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
@Test
public void testGetWrapped ()
{
  // Read and arbitrary CSS
  final CascadingStyleSheet aBaseCSS = CSSReader.readFromString ("p { color:red;}", s_eVersion);
  assertNotNull (aBaseCSS);

  // Create structured media queries
  final List <CSSMediaQuery> aMQs = MediaQueryTools.parseToMediaQuery ("screen", s_eVersion);
  assertNotNull (aMQs);

  // Wrap the source CSS with the specified media queries
  final CascadingStyleSheet aWrappedCSS = MediaQueryTools.getWrappedInMediaQuery (aBaseCSS, aMQs, false);
  assertNotNull (aWrappedCSS);
  assertEquals ("@media screen{p{color:red}}", new CSSWriter (s_eVersion, true).getCSSAsString (aWrappedCSS));
}
 

import com.helger.css.reader.CSSReader; //导入依赖的package包/类
private IHtmlNotificationCssRegistry createRegistry(IResourceStream resourceStream) throws ServiceException {
	CascadingStyleSheet sheet = CSSReader.readFromStream(new WicketResourceStreamToPhlocInputStreamProviderWrapper(resourceStream),
			Charset.defaultCharset(), ECSSVersion.CSS30);
	
	if (sheet == null) {
		throw new ServiceException("An error occurred while parsing notification CSS; see the logs for details.");
	} else {
		return new SimplePhlocCssHtmlNotificationCssRegistry(sheet);
	}
}