Examples with SACMediaList org.w3c.css.sac.SACMediaList used on opensource projects

Example 1 with SACMediaList

use of org.w3c.css.sac.SACMediaList in project CodenameOne by codenameone.

the class CSSTheme method load.

public static CSSTheme load(URL uri) throws IOException {
    try {
        System.setProperty("org.w3c.css.sac.parser", "org.w3c.flute.parser.Parser");
        InputSource source = new InputSource();
        InputStream stream = uri.openStream();
        String stringContents = Util.readToString(stream);
        // The flute parser chokes on properties beginning with -- so we need to replace these with cn1 prefix
        // for CSS variable support.
        stringContents = stringContents.replaceAll("([\\(\\W])(--[a-zA-Z0-9\\-]+)", "$1cn1$2");
        // Flute chokes on embedded var() functions inside an rgb or rgba function.  Hoping to support it by changing the
        // function name to cn1rgb() and cn1rgba() respectively.
        stringContents = stringContents.replaceAll("\\brgb\\(", "cn1rgb(");
        stringContents = stringContents.replaceAll("\\brgba\\(", "cn1rgba(");
        source.setCharacterStream(new CharArrayReader(stringContents.toCharArray()));
        source.setURI(uri.toString());
        source.setEncoding("UTF-8");
        ParserFactory parserFactory = new ParserFactory();
        Parser parser = parserFactory.makeParser();
        final CSSTheme theme = new CSSTheme();
        theme.baseURL = uri;
        parser.setErrorHandler(new ErrorHandler() {

            @Override
            public void warning(CSSParseException csspe) throws CSSException {
                System.out.println("CSS Warning: " + csspe.getLocalizedMessage() + " on line " + csspe.getLineNumber() + " col: " + csspe.getColumnNumber() + " of file " + csspe.getURI());
            }

            @Override
            public void error(CSSParseException csspe) throws CSSException {
                System.out.println("CSS Error: " + csspe.getLocalizedMessage() + " on line " + csspe.getLineNumber() + " col: " + csspe.getColumnNumber() + " of file " + csspe.getURI());
            }

            @Override
            public void fatalError(CSSParseException csspe) throws CSSException {
                System.out.println("CSS Fatal Error: " + csspe.getLocalizedMessage() + " on line " + csspe.getLineNumber() + " col: " + csspe.getColumnNumber() + " of file " + csspe.getURI());
            }
        });
        // parser.setLocale(Locale.getDefault());
        parser.setDocumentHandler(new DocumentHandler() {

            Map<String, LexicalUnit> variables = new LinkedHashMap<>();

            SelectorList currSelectors;

            FontFace currFontFace;

            SACMediaList currMediaList;

            // double currentTargetDpi = 320;
            // double currentMinDpi = 120;
            // double currentMaxDpi = 640;
            // int currentScreenWidth = 1280;
            // int currentScreenHeight = 1920;
            @Override
            public void startDocument(InputSource is) throws CSSException {
            // throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
            }

            @Override
            public void endDocument(InputSource is) throws CSSException {
            // throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
            }

            @Override
            public void comment(String string) throws CSSException {
            }

            @Override
            public void ignorableAtRule(String string) throws CSSException {
            // throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
            }

            @Override
            public void namespaceDeclaration(String string, String string1) throws CSSException {
            // throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
            }

            @Override
            public void importStyle(String string, SACMediaList sacml, String string1) throws CSSException {
            // throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
            }

            @Override
            public void startMedia(SACMediaList sacml) throws CSSException {
                currMediaList = sacml;
            }

            @Override
            public void endMedia(SACMediaList sacml) throws CSSException {
                currMediaList = null;
            }

            @Override
            public void startPage(String string, String string1) throws CSSException {
            // throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
            }

            @Override
            public void endPage(String string, String string1) throws CSSException {
            // throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
            }

            @Override
            public void startFontFace() throws CSSException {
                currFontFace = theme.createFontFace();
            }

            @Override
            public void endFontFace() throws CSSException {
                currFontFace = null;
            }

            @Override
            public void startSelector(SelectorList sl) throws CSSException {
                // throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
                currSelectors = sl;
            }

            @Override
            public void endSelector(SelectorList sl) throws CSSException {
                currSelectors = null;
            }

            @Override
            public void property(String string, LexicalUnit lu, boolean bln) throws CSSException {
                try {
                    property_(string, lu, bln);
                } catch (Throwable t) {
                    if (t instanceof CSSException) {
                        throw (CSSException) t;
                    } else {
                        System.out.println("Exception occurred while parsing property " + string + " " + lu);
                        t.printStackTrace();
                        throw new ParseException(t.getMessage());
                    }
                }
            }

            private ScaledUnit last(LexicalUnit lu) {
                while (lu.getNextLexicalUnit() != null) {
                    lu = lu.getNextLexicalUnit();
                }
                return (lu instanceof ScaledUnit) ? (ScaledUnit) lu : new ScaledUnit(lu, theme.currentDpi, theme.getPreviewScreenWidth(), theme.getPreviewScreenHeight());
            }

            /**
             * Evaluates a LexicalUnit in the current parser position.  This will expand any variables.  It will
             * continue to evaluate the next lexical unit, until it reaches the end of the current lexical unit chain.
             * @param lu The lexical unit to evaluate.
             * @return
             * @throws CSSException
             */
            private ScaledUnit evaluate(LexicalUnit lu) throws CSSException {
                if (lu.getLexicalUnitType() == LexicalUnit.SAC_FUNCTION && "var".equals(lu.getFunctionName())) {
                    LexicalUnit parameters = lu.getParameters();
                    String varname = parameters.getStringValue();
                    LexicalUnit varVal = variables.get(varname);
                    ScaledUnit su;
                    if (varVal == null && parameters.getNextLexicalUnit() != null) {
                        varVal = parameters.getNextLexicalUnit();
                        su = evaluate(new ScaledUnit(varVal, theme.currentDpi, theme.getPreviewScreenWidth(), theme.getPreviewScreenHeight()));
                    } else if (varVal == null) {
                        su = new ScaledUnit(lu, theme.currentDpi, theme.getPreviewScreenWidth(), theme.getPreviewScreenHeight());
                    } else {
                        su = evaluate(new ScaledUnit(varVal, theme.currentDpi, theme.getPreviewScreenWidth(), theme.getPreviewScreenHeight()));
                    }
                    // Evaluate the variable value in case it also includes other variables that need to be evaluated.
                    // ScaledUnit su = evaluate(new ScaledUnit(varVal, theme.currentDpi, theme.getPreviewScreenWidth(), theme.getPreviewScreenHeight()));
                    LexicalUnit toAppend = lu.getNextLexicalUnit();
                    ScaledUnit last = last(su);
                    if (toAppend != null) {
                        toAppend = evaluate(toAppend);
                        last.setNextLexicalUnit(toAppend);
                        ((ScaledUnit) toAppend).setPrevLexicalUnit(last);
                    } else {
                        last.setNextLexicalUnit(null);
                    }
                    return su;
                } else {
                    ScaledUnit su = new ScaledUnit(lu, theme.currentDpi, theme.getPreviewScreenWidth(), theme.getPreviewScreenHeight());
                    LexicalUnit nex = su.getNextLexicalUnit();
                    if (su.getParameters() != null) {
                        su.setParameters(evaluate(su.getParameters()));
                    }
                    if (nex != null) {
                        ScaledUnit snex = evaluate(nex);
                        su.setNextLexicalUnit(snex);
                        snex.setPrevLexicalUnit(su);
                    }
                    return su;
                }
            }

            private void property_(String string, LexicalUnit _lu, boolean bln) throws CSSException {
                if (string.startsWith("cn1--")) {
                    variables.put(string, _lu);
                    return;
                }
                ScaledUnit su = evaluate(_lu);
                if (currFontFace != null) {
                    switch(string) {
                        case "font-family":
                            currFontFace.fontFamily = su;
                            break;
                        case "font-style":
                            currFontFace.fontStyle = su;
                            break;
                        case "font-stretch":
                            currFontFace.fontStretch = su;
                            break;
                        case "src":
                            currFontFace.src = su;
                            break;
                        case "font-weight":
                            currFontFace.fontWeight = su;
                            break;
                    }
                } else {
                    int len = currSelectors.getLength();
                    for (int i = 0; i < len; i++) {
                        Selector sel = currSelectors.item(i);
                        if (currMediaList != null) {
                            for (String mediaPrefix : getMediaPrefixes(currMediaList)) {
                                theme.apply(mediaPrefix, sel, string, su);
                            }
                        } else {
                            theme.apply(null, sel, string, su);
                        }
                    }
                }
            }
        });
        parser.parseStyleSheet(source);
        stream.close();
        return theme;
    } catch (ClassNotFoundException ex) {
        Logger.getLogger(CSSTheme.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        Logger.getLogger(CSSTheme.class.getName()).log(Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        Logger.getLogger(CSSTheme.class.getName()).log(Level.SEVERE, null, ex);
    } catch (NullPointerException ex) {
        if (ex.getMessage().contains("encoding properties")) {
        // This error always happens and there doesn't seem to be a way to fix it... so let's just hide
        // it .  Doesn't seem to hurt anything.
        } else {
        // Logger.getLogger(CSSTheme.class.getName()).log(Level.SEVERE, null, ex);
        }
    } catch (ClassCastException ex) {
        Logger.getLogger(CSSTheme.class.getName()).log(Level.SEVERE, null, ex);
    }
    return null;
}