Source Code Cross Referenced for AbstractJspParser.java in  » IDE-Eclipse » jdt » org » eclipse » jsp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Eclipse » jdt » org.eclipse.jsp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*******************************************************************************
002:         * Copyright (c) 2003 IBM Corporation and others.
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         *     IBM Corporation - initial API and implementation
010:         *******************************************************************************/package org.eclipse.jsp;
011:
012:        import java.io.IOException;
013:        import java.io.Reader;
014:
015:        public abstract class AbstractJspParser {
016:
017:            private Reader fReader;
018:            private boolean fHasUnread;
019:            private int fUnread;
020:            private int fPos;
021:            protected int fLines = 1;
022:
023:            AbstractJspParser() {
024:                super ();
025:            }
026:
027:            private int getc() throws IOException {
028:                fPos++;
029:                if (fHasUnread) {
030:                    fHasUnread = false;
031:                    return fUnread;
032:                }
033:
034:                int ch = fReader.read();
035:
036:                if (ch == '\n') // LF
037:                    fLines++;
038:                else if (ch == '\r') { // CR
039:                    int nextCh = getc();
040:                    if (nextCh != '\n')
041:                        fLines++;
042:                    return nextCh;
043:                }
044:                return ch;
045:            }
046:
047:            private void ungetc(int c) {
048:                fHasUnread = true;
049:                fUnread = c;
050:                fPos--;
051:            }
052:
053:            private void parseDirective() throws IOException {
054:                StringBuffer sb = new StringBuffer();
055:                int pos = fPos;
056:                while (true) {
057:                    int c = getc();
058:                    if (c == '%') {
059:                        c = getc();
060:                        if (c == '>') {
061:                            // get attributes
062:                            parseAttributes(pos, sb.toString());
063:                            return;
064:                        }
065:                    }
066:                    sb.append((char) c);
067:                }
068:            }
069:
070:            private void parseTag(boolean endTag) throws IOException {
071:                StringBuffer sb = new StringBuffer();
072:                int pos = fPos;
073:                while (true) {
074:                    int c = getc();
075:                    if (c == '/') {
076:                        c = getc();
077:                        if (c == '>') {
078:                            // get attributes
079:                            parseAttributes(pos, sb.toString());
080:                            return;
081:                        } else {
082:                            ungetc(c);
083:                        }
084:                    } else if (c == '>') {
085:                        // get attributes
086:                        parseAttributes(pos, sb.toString());
087:                        return;
088:                    }
089:                    sb.append((char) c);
090:                }
091:            }
092:
093:            private void parseComment() throws IOException {
094:                while (true) {
095:                    int c = getc();
096:                    if (c == '-') {
097:                        c = getc();
098:                        if (c == '-') {
099:                            c = getc();
100:                            if (c == '%') {
101:                                c = getc();
102:                                if (c == '>') {
103:                                    return;
104:                                }
105:                            }
106:                        }
107:                    }
108:                }
109:            }
110:
111:            private void parseJava(char type) throws IOException {
112:                StringBuffer sb = new StringBuffer();
113:                int line = fLines;
114:                while (true) {
115:                    int c = getc();
116:                    if (c == '%') {
117:                        c = getc();
118:                        if (c == '>') {
119:                            java(type, sb.toString(), line);
120:                            return;
121:                        }
122:                    }
123:                    sb.append((char) c);
124:                }
125:            }
126:
127:            protected void java(char tagType, String contents, int line) {
128:                // empty implementation
129:            }
130:
131:            private void parseAttributes(int pos, String s) {
132:
133:                boolean hasValue = false;
134:                StringBuffer name = new StringBuffer();
135:                StringBuffer value = new StringBuffer();
136:                String startTag = ""; //$NON-NLS-1$
137:                int i = 0;
138:                int ix = 0;
139:                int startName = 0;
140:                int startValue = 0;
141:                char c = s.charAt(i++);
142:
143:                try {
144:                    while (true) {
145:
146:                        // whitespace		
147:                        while (Character.isWhitespace(c))
148:                            c = s.charAt(i++);
149:
150:                        startName = i;
151:                        while (Character.isLetterOrDigit(c) || c == ':') {
152:                            name.append(c);
153:                            c = s.charAt(i++);
154:                        }
155:
156:                        // whitespace		
157:                        while (Character.isWhitespace(c))
158:                            c = s.charAt(i++);
159:
160:                        hasValue = false;
161:                        if (c == '=') {
162:                            c = s.charAt(i++);
163:
164:                            // value
165:                            while (Character.isWhitespace(c))
166:                                c = s.charAt(i++);
167:
168:                            startValue = i;
169:
170:                            // Special handling for this taglib tag
171:                            if (startTag.equals("c:out")) { //$NON-NLS-1$
172:                                value = value.append(s.substring(startValue,
173:                                        Math.max(startValue, s.length() - 2)));
174:                                name.setLength(0);
175:                                tagAttribute(name.toString(), value.toString(),
176:                                        startName + pos, startValue + pos);
177:                                break;
178:                            } else if (c == '"') {
179:                                c = s.charAt(i++);
180:                                while (c != '"') {
181:                                    value.append(c);
182:                                    c = s.charAt(i++);
183:                                }
184:                                c = s.charAt(i++);
185:
186:                            } else {
187:                                while (Character.isLetterOrDigit(c)) {
188:                                    value.append(c);
189:                                    c = s.charAt(i++);
190:                                }
191:                            }
192:                            hasValue = true;
193:                        }
194:
195:                        if (ix == 0) {
196:                            startTag = name.toString();
197:                            startTag(false, startTag, startName + pos);
198:                        } else
199:                            tagAttribute(name.toString(), hasValue ? value
200:                                    .toString() : null, startName + pos,
201:                                    startValue + pos);
202:                        ix++;
203:
204:                        name.setLength(0);
205:                        value.setLength(0);
206:                    }
207:                } catch (StringIndexOutOfBoundsException e) {
208:                    // we don't log this exception because it is used
209:                    // as one way to exit the scanning loop
210:                }
211:
212:                if (name.length() > 0) {
213:                    if (ix == 0)
214:                        startTag(false, name.toString(), startName + pos);
215:                    else
216:                        tagAttribute(name.toString(), hasValue ? value
217:                                .toString() : null, startName + pos, startValue
218:                                + pos);
219:                }
220:
221:                endTag(false);
222:            }
223:
224:            protected void startTag(boolean endTag, String name, int startName) {
225:                // empty implementation
226:            }
227:
228:            protected void tagAttribute(String attrName, String value,
229:                    int startName, int startValue) {
230:                // empty implementation
231:            }
232:
233:            protected void endTag(boolean end) {
234:                // empty implementation
235:            }
236:
237:            protected void text(String t, int line) {
238:                // empty implementation
239:            }
240:
241:            void parse(Reader reader) throws IOException {
242:                int c;
243:                StringBuffer buffer = new StringBuffer();
244:                fPos = 0;
245:                fLines = 1;
246:                int line = fLines;
247:                fReader = reader;
248:
249:                while (true) {
250:                    c = getc();
251:                    switch (c) {
252:                    case -1:
253:                        if (buffer.length() > 0)
254:                            text(buffer.toString(), line);
255:                        return;
256:                    case '<':
257:                        c = getc();
258:                        if (c == '%') {
259:                            // flush buffer
260:                            if (buffer.length() > 0) {
261:                                text(buffer.toString(), line);
262:                                buffer.setLength(0);
263:                                line = fLines;
264:                            }
265:                            c = getc();
266:                            switch (c) {
267:                            case '-':
268:                                c = getc();
269:                                if (c == '-') {
270:                                    parseComment();
271:                                } else {
272:                                    ungetc(c);
273:                                    continue;
274:                                }
275:                                break;
276:                            case '@':
277:                                parseDirective();
278:                                break;
279:                            case ' ':
280:                            case '!':
281:                            case '=':
282:                                parseJava((char) c);
283:                                break;
284:                            default:
285:                                parseComment();
286:                                break;
287:                            }
288:                        } else if (c == '/') {
289:                            parseTag(true);
290:                        } else {
291:                            ungetc(c);
292:                            parseTag(false);
293:                        }
294:                        break;
295:                    default:
296:                        buffer.append((char) c);
297:                        break;
298:                    }
299:                }
300:            }
301:        }
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