Source Code Cross Referenced for JspDocumentParser.java in  » Web-Server » Rimfaxe-Web-Server » com » rimfaxe » webserver » compiler » jsp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » com.rimfaxe.webserver.compiler.jsp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The Apache Software License, Version 1.1
003:         *
004:         * Copyright (c) 1999 The Apache Software Foundation.  All rights 
005:         * reserved.
006:         *
007:         * Redistribution and use in source and binary forms, with or without
008:         * modification, are permitted provided that the following conditions
009:         * are met:
010:         *
011:         * 1. Redistributions of source code must retain the above copyright
012:         *    notice, this list of conditions and the following disclaimer. 
013:         *
014:         * 2. Redistributions in binary form must reproduce the above copyright
015:         *    notice, this list of conditions and the following disclaimer in
016:         *    the documentation and/or other materials provided with the
017:         *    distribution.
018:         *
019:         * 3. The end-user documentation included with the redistribution, if
020:         *    any, must include the following acknowlegement:  
021:         *       "This product includes software developed by the 
022:         *        Apache Software Foundation (http://www.apache.org/)."
023:         *    Alternately, this acknowlegement may appear in the software itself,
024:         *    if and wherever such third-party acknowlegements normally appear.
025:         *
026:         * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
027:         *    Foundation" must not be used to endorse or promote products derived
028:         *    from this software without prior written permission. For written 
029:         *    permission, please contact apache@apache.org.
030:         *
031:         * 5. Products derived from this software may not be called "Apache"
032:         *    nor may "Apache" appear in their names without prior written
033:         *    permission of the Apache Group.
034:         *
035:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046:         * SUCH DAMAGE.
047:         * ====================================================================
048:         *
049:         * This software consists of voluntary contributions made by many
050:         * individuals on behalf of the Apache Software Foundation.  For more
051:         * information on the Apache Software Foundation, please see
052:         * <http://www.apache.org/>.
053:         *
054:         */
055:        package com.rimfaxe.webserver.compiler.jsp;
056:
057:        import java.io.*;
058:        import java.util.Hashtable;
059:        import javax.servlet.jsp.tagext.*;
060:        import javax.xml.parsers.SAXParserFactory;
061:        import javax.xml.parsers.ParserConfigurationException;
062:        import javax.xml.parsers.SAXParser;
063:        import org.xml.sax.*;
064:        import org.xml.sax.ext.LexicalHandler;
065:        import org.xml.sax.helpers.DefaultHandler;
066:        import org.xml.sax.helpers.AttributesImpl;
067:
068:        import com.rimfaxe.webserver.servletapi.jsp.JSPclass;
069:
070:        /**
071:         * Class implementing a parser for a JSP document, that is, a JSP page in XML
072:         * syntax.
073:         *
074:         * @author Jan Luehe
075:         * @author Lars Andersen
076:         */
077:
078:        public class JspDocumentParser extends DefaultHandler implements 
079:                LexicalHandler, TagConstants {
080:
081:            private static final String XMLNS = "xmlns:";
082:            private static final String XMLNS_JSP = "xmlns:jsp";
083:            private static final String JSP_VERSION = "version";
084:            private static final String URN_JSPTLD = "urn:jsptld:";
085:            private static final String LEXICAL_HANDLER_PROPERTY = "http://xml.org/sax/properties/lexical-handler";
086:
087:            private ParserController parserController;
088:
089:            // XML document source
090:            private InputSource inputSource;
091:
092:            // XXX
093:            private String path;
094:
095:            // Node representing the XML element currently being parsed
096:            private Node current;
097:
098:            // Document locator
099:            private Locator locator;
100:
101:            // XXX
102:            private Hashtable taglibs;
103:
104:            // Flag indicating whether we are inside DTD declarations
105:            private boolean inDTD;
106:
107:            //private ErrorDispatcher err;
108:
109:            /*
110:             * Constructor
111:             */
112:            public JspDocumentParser(ParserController pc, String path,
113:                    InputStreamReader reader) {
114:                this .parserController = pc;
115:                this .taglibs = pc.getCompiler().getPageInfo().getTagLibraries();
116:                //this.taglibs = pc.getWebContext().getTagLibraries();
117:                this .path = path;
118:                this .inputSource = new InputSource(reader);
119:            }
120:
121:            /*
122:             * Parses a JSP document by responding to SAX events.
123:             *
124:             * @throws JasperException XXX
125:             */
126:            public static Node.Nodes parse(ParserController pc, String path,
127:                    InputStreamReader reader, Node parent)
128:                    throws JasperException {
129:                //System.out.println("JspDocumentParser parse");
130:                JspDocumentParser handler = new JspDocumentParser(pc, path,
131:                        reader);
132:                handler.current = parent;
133:                Node.Nodes pageNodes = null;
134:
135:                try {
136:                    SAXParser saxParser = new com.rimfaxe.xml.xmlreader.SAXParserImpl(
137:                            false);
138:                    XMLReader xmlReader = saxParser.getXMLReader();
139:                    xmlReader.setProperty(LEXICAL_HANDLER_PROPERTY, handler);
140:                    xmlReader.setErrorHandler(handler);
141:
142:                    // Parse the input
143:                    saxParser.parse(handler.inputSource, handler);
144:
145:                    if (parent == null) {
146:                        // Add the jsp:root element to the parse result
147:                        pageNodes = new Node.Nodes(
148:                                (Node.JspRoot) handler.current);
149:                    } else {
150:                        pageNodes = parent.getBody();
151:                    }
152:                } catch (IOException ioe) {
153:                    pc.getCompiler().getJspClass().setError(JSPclass.JSP_ERROR);
154:                    pc.getCompiler().getJspClass().writeStacktrace(ioe);
155:                    //handler.err.jspError("jsp.error.data.file.read", path, ioe);
156:                } catch (Exception e) {
157:                    pc.getCompiler().getJspClass().setError(JSPclass.JSP_ERROR);
158:                    pc.getCompiler().getJspClass().writeStacktrace(e);
159:                    //handler.err.jspError(e);
160:                }
161:
162:                return pageNodes;
163:            }
164:
165:            /*
166:             * Receives notification of the start of an element.
167:             */
168:            public void startElement(String uri, String localName,
169:                    String qName, Attributes attrs) throws SAXException {
170:
171:                Mark start = new Mark(path, locator.getLineNumber(), locator
172:                        .getColumnNumber());
173:                Attributes attrsCopy = new AttributesImpl(attrs);
174:
175:                Node node = null;
176:                if (qName.equals(JSP_ROOT_TAG)) {
177:                    node = new Node.JspRoot(attrsCopy, start, current);
178:                    try {
179:                        addCustomTagLibraries(attrsCopy);
180:                    } catch (JasperException je) {
181:                        throw new SAXException(je);
182:                    }
183:                } else if (qName.equals(JSP_PAGE_DIRECTIVE_TAG)) {
184:                    node = new Node.PageDirective(attrsCopy, start, current);
185:                    String imports = attrs.getValue("import");
186:                    // There can only be one 'import' attribute per page directive
187:                    if (imports != null) {
188:                        ((Node.PageDirective) node).addImport(imports);
189:                    }
190:                } else if (qName.equals(JSP_INCLUDE_DIRECTIVE_TAG)) {
191:                    node = new Node.IncludeDirective(attrsCopy, start, current);
192:                    String file = attrsCopy.getValue("file");
193:                    try {
194:                        parserController.parse(file, node);
195:                    } catch (FileNotFoundException fnfe) {
196:                        //throw new SAXParseException("jsp.error.file.not.found");
197:                    } catch (Exception e) {
198:                        throw new SAXException(e);
199:                    }
200:                } else if (qName.equals(JSP_DECLARATION_TAG)) {
201:                    node = new Node.Declaration(start, current);
202:                } else if (qName.equals(JSP_SCRIPTLET_TAG)) {
203:                    node = new Node.Scriptlet(start, current);
204:                } else if (qName.equals(JSP_EXPRESSION_TAG)) {
205:                    node = new Node.Expression(start, current);
206:                } else if (qName.equals(JSP_USE_BEAN_TAG)) {
207:                    node = new Node.UseBean(attrsCopy, start, current);
208:                } else if (qName.equals(JSP_SET_PROPERTY_TAG)) {
209:                    node = new Node.SetProperty(attrsCopy, start, current);
210:                } else if (qName.equals(JSP_GET_PROPERTY_TAG)) {
211:                    node = new Node.GetProperty(attrsCopy, start, current);
212:                } else if (qName.equals(JSP_INCLUDE_TAG)) {
213:                    node = new Node.IncludeAction(attrsCopy, start, current);
214:                } else if (qName.equals(JSP_FORWARD_TAG)) {
215:                    node = new Node.ForwardAction(attrsCopy, start, current);
216:                } else if (qName.equals(JSP_PARAM_TAG)) {
217:                    node = new Node.ParamAction(attrsCopy, start, current);
218:                } else if (qName.equals(JSP_PARAMS_TAG)) {
219:                    node = new Node.ParamsAction(start, current);
220:                } else if (qName.equals(JSP_PLUGIN_TAG)) {
221:                    node = new Node.PlugIn(attrsCopy, start, current);
222:                } else if (qName.equals(JSP_TEXT_TAG)) {
223:                    node = new Node.JspText(start, current);
224:                } else {
225:                    node = getCustomTag(qName, attrsCopy, start, current);
226:                    if (node == null) {
227:                        node = new Node.UninterpretedTag(attrsCopy, start,
228:                                qName, current);
229:                    }
230:                }
231:
232:                current = node;
233:            }
234:
235:            /*
236:             * Receives notification of character data inside an element.
237:             *
238:             * @param buf The characters
239:             * @param offset The start position in the character array
240:             * @param len The number of characters to use from the character array
241:             *
242:             * @throws SAXException
243:             */
244:            public void characters(char[] buf, int offset, int len)
245:                    throws SAXException {
246:                /*
247:                 * All textual nodes that have only white space are to be dropped from
248:                 * the document, except for nodes in a jsp:text element, which are 
249:                 * kept verbatim (JSP 5.2.1).
250:                 */
251:                boolean isAllSpace = true;
252:                if (!(current instanceof  Node.JspText)) {
253:                    for (int i = offset; i < offset + len; i++) {
254:                        if (!Character.isSpace(buf[i])) {
255:                            isAllSpace = false;
256:                            break;
257:                        }
258:                    }
259:                }
260:                if ((current instanceof  Node.JspText) || !isAllSpace) {
261:                    Mark start = new Mark(path, locator.getLineNumber(),
262:                            locator.getColumnNumber());
263:                    char[] bufCopy = new char[len];
264:                    System.arraycopy(buf, offset, bufCopy, 0, len);
265:                    new Node.TemplateText(bufCopy, start, current);
266:                }
267:            }
268:
269:            /*
270:             * Receives notification of the end of an element.
271:             */
272:            public void endElement(String uri, String localName, String qName)
273:                    throws SAXException {
274:                if (current instanceof  Node.ScriptingElement) {
275:                    checkScriptingBody(current.getBody());
276:                }
277:                if (current.getParent() != null) {
278:                    current = current.getParent();
279:                }
280:            }
281:
282:            /*
283:             * Receives the document locator.
284:             *
285:             * @param locator the document locator
286:             */
287:            public void setDocumentLocator(Locator locator) {
288:                this .locator = locator;
289:            }
290:
291:            /*
292:             * See org.xml.sax.ext.LexicalHandler.
293:             */
294:            public void comment(char[] buf, int offset, int len)
295:                    throws SAXException {
296:                // ignore comments in the DTD
297:                if (!inDTD) {
298:                    Mark start = new Mark(path, locator.getLineNumber(),
299:                            locator.getColumnNumber());
300:                    char[] bufCopy = new char[len];
301:                    System.arraycopy(buf, offset, bufCopy, 0, len);
302:                    new Node.Comment(bufCopy, start, current);
303:                }
304:            }
305:
306:            /*
307:             * See org.xml.sax.ext.LexicalHandler.
308:             */
309:            public void startCDATA() throws SAXException {
310:                // do nothing
311:            }
312:
313:            /*
314:             * See org.xml.sax.ext.LexicalHandler.
315:             */
316:            public void endCDATA() throws SAXException {
317:                // do nothing
318:            }
319:
320:            /*
321:             * See org.xml.sax.ext.LexicalHandler.
322:             */
323:            public void startEntity(String name) throws SAXException {
324:                // do nothing
325:            }
326:
327:            /*
328:             * See org.xml.sax.ext.LexicalHandler.
329:             */
330:            public void endEntity(String name) throws SAXException {
331:                // do nothing
332:            }
333:
334:            /*
335:             * See org.xml.sax.ext.LexicalHandler.
336:             */
337:            public void startDTD(String name, String publicId, String systemId)
338:                    throws SAXException {
339:                inDTD = true;
340:            }
341:
342:            /*
343:             * See org.xml.sax.ext.LexicalHandler.
344:             */
345:            public void endDTD() throws SAXException {
346:                inDTD = false;
347:            }
348:
349:            /*
350:             * Receives notification of a non-recoverable error.
351:             */
352:            public void fatalError(SAXParseException e) throws SAXException {
353:                throw e;
354:            }
355:
356:            /*
357:             * Receives notification of a recoverable error.
358:             */
359:            public void error(SAXParseException e) throws SAXException {
360:                throw e;
361:            }
362:
363:            //*********************************************************************
364:            // Private utility methods
365:
366:            /*
367:             * Checks if the XML element with the given tag name is a custom action,
368:             * and returns the corresponding Node object.
369:             */
370:            private Node getCustomTag(String qName, Attributes attrs,
371:                    Mark start, Node parent) throws SAXException {
372:                int colon = qName.indexOf(':');
373:                if (colon == -1) {
374:                    return null;
375:                }
376:
377:                String prefix = qName.substring(0, colon);
378:                String shortName = qName.substring(colon + 1);
379:                if (shortName.length() == 0) {
380:                    return null;
381:                }
382:
383:                // Check if this is a user-defined (custom) tag
384:                TagLibraryInfo tagLibInfo = (TagLibraryInfo) taglibs
385:                        .get(prefix);
386:                if (tagLibInfo == null) {
387:                    return null;
388:                }
389:                TagInfo tagInfo = tagLibInfo.getTag(shortName);
390:                if (tagInfo == null) {
391:                    System.out.println("### jsp.error.bad_tag " + shortName
392:                            + " " + prefix);
393:                    //throw new SAXException(err.getString("jsp.error.bad_tag",
394:                    //					 shortName, prefix));
395:                }
396:
397:                return new Node.CustomTag(attrs, start, qName, prefix,
398:                        shortName, tagInfo, parent);
399:            }
400:
401:            /*
402:             * Parses the xmlns:prefix attributes from the jsp:root element and adds 
403:             * the corresponding TagLibraryInfo objects to the set of custom tag
404:             * libraries.
405:             */
406:            private void addCustomTagLibraries(Attributes attrs)
407:                    throws JasperException {
408:                int len = attrs.getLength();
409:                for (int i = 0; i < len; i++) {
410:                    String qName = attrs.getQName(i);
411:                    if (!qName.startsWith(XMLNS_JSP)
412:                            && !qName.startsWith(JSP_VERSION)) {
413:
414:                        // get the prefix
415:                        String prefix = null;
416:                        try {
417:                            prefix = qName.substring(XMLNS.length());
418:                        } catch (StringIndexOutOfBoundsException e) {
419:                            continue;
420:                        }
421:
422:                        // get the uri
423:                        String uri = attrs.getValue(i);
424:                        if (uri.startsWith(URN_JSPTLD)) {
425:                            // uri value is of the form "urn:jsptld:path"
426:                            uri = uri.substring(URN_JSPTLD.length());
427:                        }
428:
429:                        TagLibraryInfo tl = parserController.getCompiler()
430:                                .getWebContext().getTagLibrary(uri, prefix);
431:
432:                        //System.out.println("### Add "+prefix+" to taglibs");
433:                        taglibs.put(prefix, tl);
434:                    }
435:                }
436:            }
437:
438:            /*
439:             * Ensures that the given body only contains nodes that are instances of
440:             * TemplateText.
441:             *
442:             * This check is performed only for the body of a scripting (that is, a
443:             * declaration, scriptlet, or expression) element, after the end tag of a
444:             * scripting element has been reached.
445:             */
446:            private void checkScriptingBody(Node.Nodes body)
447:                    throws SAXException {
448:                if (body != null) {
449:                    int size = body.size();
450:                    for (int i = 0; i < size; i++) {
451:                        Node n = body.getNode(i);
452:                        if (!(n instanceof  Node.TemplateText)) {
453:                            //String msg = err.getString(
454:                            //    "jsp.error.parse.xml.scripting.invalid.body");
455:                            throw new SAXException(
456:                                    "jsp.error.parse.xml.scripting.invalid.body");
457:                        }
458:                    }
459:                }
460:            }
461:        }
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