com.gargoylesoftware.css.parser.CSSErrorHandler Java Examples

/**
 * Parses the CSS at the specified input source. If anything at all goes wrong, this method
 * returns an empty stylesheet.
 *
 * @param source the source from which to retrieve the CSS to be parsed
 * @param client the client
 * @return the stylesheet parsed from the specified input source
 */
private static CSSStyleSheetImpl parseCSS(final InputSource source, final WebClient client) {
    CSSStyleSheetImpl ss;
    try {
        final CSSErrorHandler errorHandler = client.getCssErrorHandler();
        final CSSOMParser parser = new CSSOMParser(new CSS3Parser());
        parser.setErrorHandler(errorHandler);
        ss = parser.parseStyleSheet(source, null);
    }
    catch (final Throwable t) {
        if (LOG.isErrorEnabled()) {
            LOG.error("Error parsing CSS from '" + toString(source) + "': " + t.getMessage(), t);
        }
        ss = new CSSStyleSheetImpl();
    }
    return ss;
}
 

/**
 * Parses the selectors at the specified input source. If anything at all goes wrong, this
 * method returns an empty selector list.
 *
 * @param source the source from which to retrieve the selectors to be parsed
 * @return the selectors parsed from the specified input source
 */
public SelectorList parseSelectors(final String source) {
    SelectorList selectors;
    try {
        final CSSErrorHandler errorHandler = getWindow().getWebWindow().getWebClient().getCssErrorHandler();
        final CSSOMParser parser = new CSSOMParser(new CSS3Parser());
        parser.setErrorHandler(errorHandler);
        selectors = parser.parseSelectors(source);
        // in case of error parseSelectors returns null
        if (null == selectors) {
            selectors = new SelectorListImpl();
        }
    }
    catch (final Throwable t) {
        if (LOG.isErrorEnabled()) {
            LOG.error("Error parsing CSS selectors from '" + source + "': " + t.getMessage(), t);
        }
        selectors = new SelectorListImpl();
    }
    return selectors;
}
 

/**
 * Parses the given media string. If anything at all goes wrong, this
 * method returns an empty MediaList list.
 *
 * @param source the source from which to retrieve the media to be parsed
 * @return the media parsed from the specified input source
 */
static MediaListImpl parseMedia(final CSSErrorHandler errorHandler, final String mediaString) {
    MediaListImpl media = media_.get(mediaString);
    if (media != null) {
        return media;
    }

    try {
        final CSSOMParser parser = new CSSOMParser(new CSS3Parser());
        parser.setErrorHandler(errorHandler);

        media = new MediaListImpl(parser.parseMedia(mediaString));
        media_.put(mediaString, media);
        return media;
    }
    catch (final Exception e) {
        if (LOG.isErrorEnabled()) {
            LOG.error("Error parsing CSS media from '" + mediaString + "': " + e.getMessage(), e);
        }
    }

    media = new MediaListImpl(null);
    media_.put(mediaString, media);
    return media;
}
 

/**
 * Parses the selectors at the specified input source. If anything at all goes wrong, this
 * method returns an empty selector list.
 *
 * @param source the source from which to retrieve the selectors to be parsed
 * @return the selectors parsed from the specified input source
 */
public SelectorList parseSelectors(final InputSource source) {
    SelectorList selectors;
    try {
        final CSSErrorHandler errorHandler = getWindow().getWebWindow().getWebClient().getCssErrorHandler();
        final CSSOMParser parser = new CSSOMParser(new CSS3Parser());
        parser.setErrorHandler(errorHandler);
        selectors = parser.parseSelectors(source);
        // in case of error parseSelectors returns null
        if (null == selectors) {
            selectors = new SelectorListImpl();
        }
    }
    catch (final Throwable t) {
        LOG.error("Error parsing CSS selectors from '" + toString(source) + "': " + t.getMessage(), t);
        selectors = new SelectorListImpl();
    }
    return selectors;
}
 

/**
 * Parses the given media string. If anything at all goes wrong, this
 * method returns an empty MediaList list.
 *
 * @param source the source from which to retrieve the media to be parsed
 * @return the media parsed from the specified input source
 */
static MediaList parseMedia(final CSSErrorHandler errorHandler, final String mediaString) {
    MediaList media = media_.get(mediaString);
    if (media != null) {
        return media;
    }

    try {
        final CSSOMParser parser = new CSSOMParser(new CSS3Parser());
        parser.setErrorHandler(errorHandler);

        final InputSource source = new InputSource(new StringReader(mediaString));
        media = new MediaListImpl(parser.parseMedia(source));
        if (media != null) {
            media_.put(mediaString, media);
            return media;
        }
    }
    catch (final Exception e) {
        LOG.error("Error parsing CSS media from '" + mediaString + "': " + e.getMessage(), e);
    }

    media = new MediaListImpl(null);
    media_.put(mediaString, media);
    return media;
}
 

/**
 * Returns whether the document currently matches the media query list or not.
 * @return whether the document currently matches the media query list or not
 */
@JsxGetter
public boolean isMatches() {
    final CSSErrorHandler errorHandler = getWindow().getWebWindow().getWebClient().getCssErrorHandler();
    final MediaListImpl mediaList = CSSStyleSheet.parseMedia(errorHandler, media_);
    return CSSStyleSheet.isActive(this, mediaList);
}
 

/**
 * Gets the CSS property value.
 * @param name the name of the property to retrieve
 * @return the value
 */
@JsxFunction(FF60)
public CSSValue getPropertyCSSValue(final String name) {
    if (LOG.isInfoEnabled()) {
        LOG.info("getPropertyCSSValue(" + name + "): getPropertyCSSValue support is experimental");
    }

    // following is a hack, just to have basic support for getPropertyCSSValue
    // TODO: rework the whole CSS processing here! we should *always* parse the style!
    if (styleDeclaration_ == null) {
        final String styleAttribute = jsElement_.getDomNodeOrDie().getAttributeDirect("style");
        final CSSErrorHandler errorHandler = getWindow().getWebWindow().getWebClient().getCssErrorHandler();
        final CSSOMParser parser = new CSSOMParser(new CSS3Parser());
        parser.setErrorHandler(errorHandler);
        try {
            styleDeclaration_ = parser.parseStyleDeclaration(styleAttribute);
        }
        catch (final IOException e) {
            throw new RuntimeException(e);
        }
    }
    CSSValueImpl cssValue = styleDeclaration_.getPropertyCSSValue(name);
    if (cssValue == null) {
        final CSSValueImpl newValue = new CSSValueImpl(null, false);
        newValue.setDoubleValue(0);
        cssValue = newValue;
    }

    // FF has spaces next to ","
    final String cssText = cssValue.getCssText();
    if (cssText.startsWith("rgb(")) {
        final String formatedCssText = StringUtils.replace(cssText, ",", ", ");
        cssValue.setCssText(formatedCssText);
    }

    return new CSSPrimitiveValue(jsElement_, cssValue);
}
 

/**
 * Returns whether the specified media is supported by the object that displays the document object.
 * @param media the media query
 * @return whether the specified media is supported or not
 */
@JsxFunction
public boolean matchMedium(final String media) {
    final CSSErrorHandler errorHandler = getWindow().getWebWindow().getWebClient().getCssErrorHandler();
    final MediaListImpl mediaList = CSSStyleSheet.parseMedia(errorHandler, media);
    return CSSStyleSheet.isActive(this, mediaList);
}
 

/**
 * Returns whether the document currently matches the media query list or not.
 * @return whether the document currently matches the media query list or not
 */
@JsxGetter
public boolean isMatches() {
    final CSSErrorHandler errorHandler = getWindow().getWebWindow().getWebClient().getCssErrorHandler();
    final MediaList mediaList = CSSStyleSheet.parseMedia(errorHandler, media_);
    return CSSStyleSheet.isActive(this, mediaList);
}
 

/**
 * Gets the CSS property value.
 * @param name the name of the property to retrieve
 * @return the value
 */
@JsxFunction(FF)
public CSSValue getPropertyCSSValue(final String name) {
    LOG.info("getPropertyCSSValue(" + name + "): getPropertyCSSValue support is experimental");
    // following is a hack, just to have basic support for getPropertyCSSValue
    // TODO: rework the whole CSS processing here! we should *always* parse the style!
    if (styleDeclaration_ == null) {
        final String uri = getDomNodeOrDie().getPage().getWebResponse().getWebRequest()
                .getUrl().toExternalForm();
        final String styleAttribute = jsElement_.getDomNodeOrDie().getAttributeDirect("style");
        final InputSource source = new InputSource(new StringReader(styleAttribute));
        source.setURI(uri);
        final CSSErrorHandler errorHandler = getWindow().getWebWindow().getWebClient().getCssErrorHandler();
        final CSSOMParser parser = new CSSOMParser(new CSS3Parser());
        parser.setErrorHandler(errorHandler);
        try {
            styleDeclaration_ = parser.parseStyleDeclaration(source);
        }
        catch (final IOException e) {
            throw new RuntimeException(e);
        }
    }
    org.w3c.dom.css.CSSValue cssValue = styleDeclaration_.getPropertyCSSValue(name);
    if (cssValue == null) {
        final CSSValueImpl newValue = new CSSValueImpl(null, false);
        newValue.setFloatValue(CSSPrimitiveValue.CSS_PX, 0);
        cssValue = newValue;
    }

    // FF has spaces next to ","
    final String cssText = cssValue.getCssText();
    if (cssText.startsWith("rgb(")) {
        final String formatedCssText = StringUtils.replace(cssText, ",", ", ");
        cssValue.setCssText(formatedCssText);
    }

    return new CSSPrimitiveValue(jsElement_, (org.w3c.dom.css.CSSPrimitiveValue) cssValue);
}
 

/**
 * Parses the CSS at the specified input source. If anything at all goes wrong, this method
 * returns an empty stylesheet.
 *
 * @param source the source from which to retrieve the CSS to be parsed
 * @return the stylesheet parsed from the specified input source
 */
private org.w3c.dom.css.CSSStyleSheet parseCSS(final InputSource source) {
    org.w3c.dom.css.CSSStyleSheet ss;
    try {
        final CSSErrorHandler errorHandler = getWindow().getWebWindow().getWebClient().getCssErrorHandler();
        final CSSOMParser parser = new CSSOMParser(new CSS3Parser());
        parser.setErrorHandler(errorHandler);
        ss = parser.parseStyleSheet(source, null);
    }
    catch (final Throwable t) {
        LOG.error("Error parsing CSS from '" + toString(source) + "': " + t.getMessage(), t);
        ss = new CSSStyleSheetImpl();
    }
    return ss;
}
 

/**
 * Returns whether the specified media is supported by the object that displays the document object.
 * @param media the media query
 * @return whether the specified media is supported or not
 */
@JsxFunction
public boolean matchMedium(final String media) {
    final CSSErrorHandler errorHandler = getWindow().getWebWindow().getWebClient().getCssErrorHandler();
    final MediaList mediaList = CSSStyleSheet.parseMedia(errorHandler, media);
    return CSSStyleSheet.isActive(this, mediaList);
}
 

/**
 * Returns the CSS error handler used by this web client when CSS problems are encountered.
 * @return the CSS error handler used by this web client when CSS problems are encountered
 * @see DefaultCssErrorHandler
 * @see SilentCssErrorHandler
 */
public CSSErrorHandler getCssErrorHandler() {
    return cssErrorHandler_;
}
 

/**
 * Sets the CSS error handler used by this web client when CSS problems are encountered.
 * @param cssErrorHandler the CSS error handler used by this web client when CSS problems are encountered
 * @see DefaultCssErrorHandler
 * @see SilentCssErrorHandler
 */
public void setCssErrorHandler(final CSSErrorHandler cssErrorHandler) {
    WebAssert.notNull("cssErrorHandler", cssErrorHandler);
    cssErrorHandler_ = cssErrorHandler;
}
 

/**
 * Returns the CSS error handler used by this web client when CSS problems are encountered.
 * @return the CSS error handler used by this web client when CSS problems are encountered
 * @see DefaultCssErrorHandler
 * @see SilentCssErrorHandler
 */
public CSSErrorHandler getCssErrorHandler() {
    return cssErrorHandler_;
}
 

/**
 * Sets the CSS error handler used by this web client when CSS problems are encountered.
 * @param cssErrorHandler the CSS error handler used by this web client when CSS problems are encountered
 * @see DefaultCssErrorHandler
 * @see SilentCssErrorHandler
 */
public void setCssErrorHandler(final CSSErrorHandler cssErrorHandler) {
    WebAssert.notNull("cssErrorHandler", cssErrorHandler);
    cssErrorHandler_ = cssErrorHandler;
}