Source Code Cross Referenced for DynamicPage.java in  » Scripting » Pnuts » pnuts » servlet » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » Pnuts » pnuts.servlet 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DynamicPage.java
003:         *
004:         * Copyright (c) 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
005:         *
006:         * See the file "LICENSE.txt" for information on usage and redistribution
007:         * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
008:         */
009:        package pnuts.servlet;
010:
011:        import pnuts.lang.Context;
012:        import pnuts.lang.Pnuts;
013:        import pnuts.lang.Runtime;
014:        import pnuts.lang.ParseException;
015:        import pnuts.lang.PnutsException;
016:        import pnuts.ext.CachedScript;
017:        import pnuts.compiler.Compiler;
018:        import java.io.*;
019:        import java.util.StringTokenizer;
020:        import java.net.URL;
021:        import java.net.MalformedURLException;
022:        import java.util.Set;
023:        import java.util.HashSet;
024:        import java.util.Iterator;
025:        import org.pnuts.servlet.protocol.pea.Handler;
026:
027:        /**
028:         * A class responsible for dynamic page generation.
029:         */
030:        public class DynamicPage extends CachedScript {
031:
032:            private final static int BUFFER_SIZE = 4096;
033:            private final static String PRINT = "\nprint(";
034:            private final static String EOL = "\")\n";
035:
036:            public static void convert(File infile, File outfile, String enc,
037:                    Context context) throws IOException {
038:                Reader in = null;
039:                Writer out = null;
040:
041:                try {
042:                    try {
043:                        if (enc == null) {
044:                            enc = context.getScriptEncoding();
045:                        }
046:                        if (enc != null) {
047:                            in = new InputStreamReader(new FileInputStream(
048:                                    infile), enc);
049:                            out = new OutputStreamWriter(new FileOutputStream(
050:                                    outfile), enc);
051:                        } else {
052:                            in = new FileReader(infile);
053:                            out = new FileWriter(outfile);
054:                        }
055:                        convert(in, out, infile.getAbsoluteFile()
056:                                .getParentFile().toURL(), enc, context);
057:                    } finally {
058:                        if (in != null) {
059:                            in.close();
060:                        }
061:                    }
062:                } finally {
063:                    if (out != null) {
064:                        out.close();
065:                    }
066:                }
067:            }
068:
069:            public static void convert(Reader input, Writer output,
070:                    URL baseloc, String enc, Context context)
071:                    throws IOException {
072:                convert(input, output, baseloc, enc, context, null);
073:            }
074:
075:            public static void convert(Reader input, Writer output,
076:                    URL baseloc, String enc, Context context, Set scriptURLs)
077:                    throws IOException {
078:                convert(input, output, baseloc, enc, context, scriptURLs,
079:                        new boolean[1]);
080:            }
081:
082:            static void convert(Reader input, Writer output, URL baseloc,
083:                    String enc, Context context, Set scriptURLs,
084:                    boolean[] escape) throws IOException {
085:                char[] buf = new char[BUFFER_SIZE];
086:                int state = 0; // 0==outside, 1==<, 2==<%, 3==<%?, 4==%
087:                int type = -1; // 0=="<%-", 1=="<% ", 2=="<%=", 3=="<%@"
088:                boolean printing = false;
089:                CharArrayWriter s1 = new CharArrayWriter();
090:                CharArrayWriter s2 = new CharArrayWriter();
091:                int p1 = -1; // beginning of outer text
092:                int p2 = -1;
093:                boolean quote = false;
094:
095:                int n;
096:                while ((n = input.read(buf)) != -1) {
097:                    p1 = 0;
098:                    for (int i = 0; i < n; i++) {
099:                        char c = (char) buf[i];
100:                        switch (state) {
101:                        case 0: // outside
102:                            if (c == '<') {
103:                                state = 1;
104:                            }
105:                            break;
106:                        case 1: // <
107:                            if (c == '%') {
108:                                state = 2;
109:                                if (i - p1 >= 0) {
110:                                    if (!printing) {
111:                                        output.write(PRINT);
112:                                        output.write('"');
113:                                        printing = true;
114:                                    } else {
115:                                        if (quote) {
116:                                            output.write('"');
117:                                        }
118:                                        output.write(',');
119:                                        output.write('"');
120:                                    }
121:                                    quote = true;
122:                                    if (s1.size() > 0) {
123:                                        if (i - p1 > 1) {
124:                                            s1.write(buf, p1, i - 1 - p1);
125:                                        }
126:                                        char[] ca = s1.toCharArray();
127:                                        if (i == 0) {
128:                                            encode(output, ca, 0, ca.length - 1);
129:                                        } else {
130:                                            encode(output, ca);
131:                                        }
132:                                        s1.reset();
133:                                    } else {
134:                                        if (i - p1 > 1) {
135:                                            encode(output, buf, p1, i - 1 - p1);
136:                                        }
137:                                    }
138:                                }
139:                                continue;
140:                            } else {
141:                                state = 0;
142:                            }
143:                            break;
144:                        case 2:
145:                            if (c == '-') {
146:                                type = 0;
147:                                p2 = i + 1;
148:                            } else if (c == '=') {
149:                                type = 2;
150:                                p2 = i + 1;
151:                            } else if (c == '@') {
152:                                type = 3;
153:                                p2 = i + 1;
154:                            } else {
155:                                type = 1;
156:                                p2 = i;
157:                            }
158:                            state = 3;
159:                            break;
160:                        case 3:
161:                            if (c == '%') {
162:                                state = 4;
163:                            }
164:                            break;
165:                        case 4:
166:                            if (c == '>') {
167:                                state = 0;
168:                                if (i - p2 >= 1) {
169:                                    if (i - p2 > 1) {
170:                                        s2.write(buf, p2, i - 1 - p2);
171:                                    }
172:                                    if (type == 2) { // "<%="
173:                                        if (!printing) {
174:                                            output.write(PRINT);
175:                                            printing = true;
176:                                        } else {
177:                                            if (quote) {
178:                                                output.write('"');
179:                                            }
180:                                            output.write(',');
181:                                        }
182:                                        quote = false;
183:                                        if (escape[0]) {
184:                                            output.write("escape(");
185:                                        }
186:                                        s2.writeTo(output);
187:                                        if (escape[0]) {
188:                                            output.write(")");
189:                                        }
190:                                    } else if (type == 1) { // "<% "
191:                                        if (printing) {
192:                                            output.write(EOL);
193:                                            printing = false;
194:                                        }
195:                                        s2.writeTo(output);
196:                                    } else if (type == 3) { // "<%@"
197:                                        if (printing) {
198:                                            output.write(EOL);
199:                                            printing = false;
200:                                        }
201:                                        char[] b = s2.toCharArray();
202:                                        executeDirective(b, output, baseloc,
203:                                                enc, context, scriptURLs,
204:                                                escape);
205:                                        output.write('\n');
206:                                    } else if (type == 0) { // "<%-"
207:                                        if (printing) {
208:                                            output.write(EOL);
209:                                            printing = false;
210:                                        }
211:                                    }
212:                                    s2.reset();
213:                                }
214:                                p1 = i + 1;
215:                                p2 = -1;
216:                                type = -1;
217:                            } else {
218:                                state = 3;
219:                            }
220:                            break;
221:                        } // switch (state)
222:                    } // for
223:
224:                    if ((state == 0 || state == 1) && p1 >= 0) {
225:                        s1.write(buf, p1, n - p1);
226:                        p1 = 0;
227:                    } else if ((state == 2 || state == 3) && p2 >= 0) {
228:                        s2.write(buf, p2, n - p2);
229:                        p2 = 0;
230:                    } else if ((state == 4) && p2 >= 0) {
231:                        s2.write(buf, p2, n - p2 - 1);
232:                        p2 = 0;
233:                    }
234:                }
235:                if (state == 0 || state == 1) {
236:                    if (s1.size() > 0) {
237:                        if (!printing) {
238:                            output.write(PRINT);
239:                            output.write('"');
240:                            printing = true;
241:                        } else {
242:                            if (quote) {
243:                                output.write('"');
244:                            }
245:                            output.write(',');
246:                            output.write('"');
247:                        }
248:                        quote = true;
249:                        encode(output, s1.toCharArray());
250:                    }
251:                    if (printing) {
252:                        if (quote) {
253:                            output.write('"');
254:                        }
255:                        output.write(')');
256:                    }
257:                } else if (s2.size() > 0) {
258:                    if (printing) {
259:                        output.write(EOL);
260:                    }
261:                    s2.writeTo(output);
262:                    if (quote) {
263:                        output.write('"');
264:                    }
265:                    output.write(')');
266:                }
267:            }
268:
269:            /*
270:             * <%@ include file=""%>
271:             * <%@ include expr=""%>
272:             */
273:            static void executeDirective(char[] b, Writer output, URL baseloc,
274:                    String enc, Context context, Set scriptURLs,
275:                    boolean[] escape) throws IOException {
276:                String s = new String(b);
277:                StringTokenizer st = new StringTokenizer(s, " ");
278:                String s1 = st.nextToken();
279:                String s2 = null;
280:                if (st.hasMoreTokens()) {
281:                    s2 = st.nextToken();
282:                }
283:                if ("include".equals(s1)) {
284:                    int idx = s2.indexOf('=');
285:                    if (idx < 0) {
286:                        throw new RuntimeException("corrupted directive");
287:                    }
288:                    String attr = s2.substring(0, idx).trim();
289:                    String value;
290:                    int len = s2.length();
291:                    if (s2.charAt(idx + 1) == '"' && s2.charAt(len - 1) == '"') {
292:                        value = s2.substring(6, len - 1);
293:                    } else {
294:                        value = s2.substring(5);
295:                    }
296:                    if ("file".equals(attr)) {
297:                        if (baseloc != null) {
298:                            URL url = new URL(baseloc, value);
299:                            if (scriptURLs != null) {
300:                                scriptURLs.add(url);
301:                            }
302:                            Reader reader;
303:                            if (enc != null) {
304:                                reader = new InputStreamReader(
305:                                        url.openStream(), enc);
306:                            } else {
307:                                reader = Runtime.getScriptReader(url
308:                                        .openStream(), context);
309:                            }
310:                            convert(reader, output, baseloc, enc, context,
311:                                    scriptURLs, escape);
312:                        } else {
313:                            ClassLoader cl = Thread.currentThread()
314:                                    .getContextClassLoader();
315:                            URL url = cl.getResource(value);
316:                            if (scriptURLs != null && url != null) {
317:                                scriptURLs.add(url);
318:                            }
319:                            InputStream in = null;
320:                            try {
321:                                if (url != null) {
322:                                    in = url.openStream();
323:                                }
324:                            } catch (IOException e) {
325:                                // ignore
326:                            }
327:                            Reader reader;
328:                            if (in != null) {
329:                                if (enc != null) {
330:                                    reader = new InputStreamReader(in, enc);
331:                                } else {
332:                                    reader = Runtime.getScriptReader(in,
333:                                            context);
334:                                }
335:                                convert(reader, output, null, enc, context,
336:                                        scriptURLs, escape);
337:                            } else {
338:                                throw new FileNotFoundException(value);
339:                            }
340:                        }
341:                    } else if ("expr".equals(attr)) {
342:                        String v = String.valueOf(Pnuts.eval(value, context));
343:                        output.write(PRINT);
344:                        output.write('"');
345:                        encode(output, v.toCharArray());
346:                        output.write(EOL);
347:                    } else {
348:                        throw new RuntimeException("unsupported include type");
349:                    }
350:                } else if ("escape".equals(s1)) { /* <%@escape%> */
351:                    escape[0] = true;
352:                } else if ("no-escape".equals(s1)) { /* <%@no-escape%> */
353:                    escape[0] = false;
354:                } else {
355:                    throw new RuntimeException("not supported directive");
356:                }
357:            }
358:
359:            static void encode(Writer output, char[] buf) throws IOException {
360:                encode(output, buf, 0, buf.length);
361:            }
362:
363:            static void encode(Writer output, char[] src, int offset, int size)
364:                    throws IOException {
365:                char[] buf = new char[512];
366:                int bufsize = buf.length;
367:                int pos = 0;
368:
369:                for (int i = offset; i < offset + size; i++) {
370:                    if (pos + 2 > bufsize) {
371:                        output.write(buf, 0, pos);
372:                        pos = 0;
373:                    }
374:                    int c = src[i];
375:                    switch (c) {
376:                    case '\\':
377:                        buf[pos++] = '\\';
378:                        buf[pos++] = '\\';
379:                        break;
380:                    case '"':
381:                        buf[pos++] = '\\';
382:                        buf[pos++] = '"';
383:                        break;
384:                    default:
385:                        buf[pos++] = (char) c;
386:                    }
387:                }
388:                if (pos > 0) {
389:                    output.write(buf, 0, pos);
390:                }
391:            }
392:
393:            private Set scriptURLs;
394:            private boolean checkUpdates;
395:
396:            public DynamicPage(URL scriptURL, String encoding, Context context)
397:                    throws IOException, ParseException {
398:                this (scriptURL, encoding, context, true);
399:            }
400:
401:            public DynamicPage(URL scriptURL, String encoding, Context context,
402:                    boolean checkUpdates) throws IOException, ParseException {
403:                super (scriptURL, encoding, context);
404:                this .checkUpdates = checkUpdates;
405:            }
406:
407:            protected boolean needToUpdate() {
408:                if (scriptURLs == null) {
409:                    return true;
410:                }
411:                if (checkUpdates) {
412:                    try {
413:                        for (Iterator it = scriptURLs.iterator(); it.hasNext();) {
414:                            URL url = (URL) it.next();
415:                            long mod = url.openConnection().getLastModified();
416:                            if (mod > parsedTime) {
417:                                return true;
418:                            }
419:                        }
420:                    } catch (IOException e) {
421:                        // ignore
422:                        e.printStackTrace();
423:                    }
424:                }
425:                return false;
426:            }
427:
428:            private Reader getReader(InputStream in, Context context)
429:                    throws UnsupportedEncodingException {
430:                if (encoding != null) {
431:                    return new InputStreamReader(in, encoding);
432:                } else {
433:                    return Runtime.getScriptReader(in, context);
434:                }
435:            }
436:
437:            static URL getDynamicPageURL(URL url, String encoding,
438:                    Context context, Set scriptURLs) {
439:                try {
440:                    String specURL;
441:                    if (encoding == null) {
442:                        specURL = "pea:" + url.toExternalForm();
443:                    } else {
444:                        specURL = "pea:" + url.toExternalForm() + "!charset="
445:                                + encoding;
446:                    }
447:                    return new URL(null, specURL, new Handler(context,
448:                            scriptURLs));
449:                } catch (MalformedURLException mue) {
450:                    mue.printStackTrace();
451:                    return null;
452:                }
453:            }
454:
455:            protected Compiler getCompiler() {
456:                return new Compiler(null, false);
457:            }
458:
459:            protected Pnuts compile(Pnuts parsed, Context context) {
460:                Compiler compiler = getCompiler();
461:                if (compiler != null) {
462:                    return (Pnuts) compiler.compile(parsed, context);
463:                } else {
464:                    return parsed;
465:                }
466:            }
467:
468:            protected void update(Context context) throws IOException,
469:                    ParseException {
470:                try {
471:                    Set scriptURLs = new HashSet();
472:                    scriptURLs.add(scriptURL);
473:                    URL convertedURL = getDynamicPageURL(scriptURL, encoding,
474:                            context, scriptURLs);
475:                    InputStream in = null;
476:                    try {
477:                        in = convertedURL.openStream();
478:                        StringWriter sw = new StringWriter();
479:                        Pnuts parsed = Pnuts.parse(getReader(in, context),
480:                                convertedURL, context);
481:                        this .script = compile(parsed, context);
482:                        this .scriptURLs = scriptURLs;
483:                        this .parsedTime = System.currentTimeMillis();
484:                    } finally {
485:                        if (in != null) {
486:                            in.close();
487:                        }
488:                    }
489:                } catch (IOException e) {
490:                    throw new PnutsException(e, context);
491:                }
492:            }
493:        }
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