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44
45 import java.io.*;
46 import java.util.*;
47
48
79 public class CodeViewer {
80
81 private static HashMap reservedWords = new HashMap(); private boolean inMultiLineComment = false;
84 private String backgroundColor = "#ffffff";
85 private String commentStart = "</font><font size=2 color=\"#0000aa\"><i>";
86 private String commentEnd = "</font></i><font size=2 color=black>";
87 private String stringStart = "</font><font size=2 color=\"#00bb00\">";
88 private String stringEnd = "</font><font size=2 color=black>";
89 private String reservedWordStart = "<b>";
90 private String reservedWordEnd = "</b>";
91
92 static {
93 loadHash();
94 }
95
96 public CodeViewer() {
97 }
98
99 public void setCommentStart(String commentStart) {
100 this.commentStart = commentStart;
101 }
102 public void setCommentEnd(String commentEnd) {
103 this.commentEnd = commentEnd;
104 }
105 public void setStringStart(String stringStart) {
106 this.stringStart = stringStart;
107 }
108 public void setStringEnd(String stringEnd) {
109 this.stringEnd = stringEnd;
110 }
111 public void setReservedWordStart(String reservedWordStart) {
112 this.reservedWordStart = reservedWordStart;
113 }
114 public void setReservedWordEnd(String reservedWordEnd) {
115 this.reservedWordEnd = reservedWordEnd;
116 }
117
118 public String getCommentStart() {
119 return commentStart;
120 }
121 public String getCommentEnd() {
122 return commentEnd;
123 }
124 public String getStringStart() {
125 return stringStart;
126 }
127 public String getStringEnd() {
128 return stringEnd;
129 }
130 public String getReservedWordStart() {
131 return reservedWordStart;
132 }
133 public String getReservedWordEnd() {
134 return reservedWordEnd;
135 }
136
137
141 public String syntaxHighlight( String line ) {
142 return htmlFilter(line);
143 }
144
145
148 private String htmlFilter( String line ) {
149 if( line == null || line.equals("") ) {
150 return "";
151 }
152
153 line = replace(line, "&", "&");
155
156 line = replace(line, "\\\\", "\\" );
159
160 line = replace(line, "" + (char)92 + (char)34, "\"");
162
163 line = replace(line, "<", "<");
166 line = replace(line, ">", ">");
169
170 return multiLineCommentFilter(line);
171 }
172
173
177 private String multiLineCommentFilter(String line) {
178 if (line == null || line.equals("")) {
179 return "";
180 }
181 StringBuffer buf = new StringBuffer();
182 int index;
183 if (inMultiLineComment && (index = line.indexOf("*/")) > -1 && !isInsideString(line,index)) {
185 inMultiLineComment = false;
186 buf.append(line.substring(0,index));
187 buf.append("*/").append(commentEnd);
188 if (line.length() > index+2) {
189 buf.append(inlineCommentFilter(line.substring(index+2)));
190 }
191 return buf.toString();
192 }
193 else if (inMultiLineComment) {
196 return line;
197 }
198 else if ((index = line.indexOf("/*")) > -1 && !isInsideString(line,index)) {
201 inMultiLineComment = true;
202 buf.append(inlineCommentFilter(line.substring(0,index)));
207 buf.append(commentStart).append("/*");
208 buf.append(multiLineCommentFilter(line.substring(index+2)));
209 return buf.toString();
210 }
211 else {
214 return inlineCommentFilter(line);
215 }
216 }
217
218
221 private String inlineCommentFilter(String line) {
222 if (line == null || line.equals("")) {
223 return "";
224 }
225 StringBuffer buf = new StringBuffer();
226 int index;
227 if ((index = line.indexOf("//")) > -1 && !isInsideString(line,index)) {
228 buf.append(stringFilter(line.substring(0,index)));
229 buf.append(commentStart);
230 buf.append(line.substring(index));
231 buf.append(commentEnd);
232 }
233 else {
234 buf.append(stringFilter(line));
235 }
236 return buf.toString();
237 }
238
239
242 private String stringFilter(String line) {
243 if (line == null || line.equals("")) {
244 return "";
245 }
246 StringBuffer buf = new StringBuffer();
247 if (line.indexOf("\"") <= -1) {
248 return keywordFilter(line);
249 }
250 int start = 0;
251 int startStringIndex = -1;
252 int endStringIndex = -1;
253 int tempIndex;
254 while ((tempIndex = line.indexOf("\"")) > -1) {
256 if (startStringIndex == -1) {
258 startStringIndex = 0;
259 buf.append( stringFilter(line.substring(start,tempIndex)) );
260 buf.append(stringStart).append("\"");
261 line = line.substring(tempIndex+1);
262 }
263 else {
265 startStringIndex = -1;
266 endStringIndex = tempIndex;
267 buf.append(line.substring(0,endStringIndex+1));
268 buf.append(stringEnd);
269 line = line.substring(endStringIndex+1);
270 }
271 }
272
273 buf.append( keywordFilter(line) );
274
275 return buf.toString();
276 }
277
278
281 private String keywordFilter( String line ) {
282 if( line == null || line.equals("") ) {
283 return "";
284 }
285 StringBuffer buf = new StringBuffer();
286 HashMap usedReservedWords = new HashMap(); int i=0, startAt=0;
289 char ch;
290 StringBuffer temp = new StringBuffer();
291 while( i < line.length() ) {
292 temp.setLength(0);
293 ch = line.charAt(i);
294 startAt = i;
295 while( i<line.length() && ( ( ch >= 65 && ch <= 90 )
298 || ( ch >= 97 && ch <= 122 ) ) ) {
299 temp.append(ch);
300 i++;
301 if( i < line.length() ) {
302 ch = line.charAt(i);
303 }
304 }
305 String tempString = temp.toString();
306 if( reservedWords.containsKey(tempString) && !usedReservedWords.containsKey(tempString)) {
307 usedReservedWords.put(tempString,tempString);
308 line = replace( line, tempString, (reservedWordStart+tempString+reservedWordEnd) );
309 i += (reservedWordStart.length() + reservedWordEnd.length());
310 }
311 else {
312 i++;
313 }
314 }
315 buf.append(line);
316 return buf.toString();
317 }
318
319
323 private String replace( String line, String oldString, String newString ) {
324 int i=0;
325 while( ( i=line.indexOf( oldString, i ) ) >= 0 ) {
326 line = (new StringBuffer().append(line.substring(0,i)).append(newString).append(line.substring(i+oldString.length()))).toString();
327 i += newString.length();
328 }
329 return line;
330 }
331
332
336 private boolean isInsideString(String line, int position) {
337 if (line.indexOf("\"") < 0) {
338 return false;
339 }
340 int index;
341 String left = line.substring(0,position);
342 String right = line.substring(position);
343 int leftCount = 0;
344 int rightCount = 0;
345 while ((index = left.indexOf("\"")) > -1) {
346 leftCount ++;
347 left = left.substring(index+1);
348 }
349 while ((index = right.indexOf("\"")) > -1) {
350 rightCount ++;
351 right = right.substring(index+1);
352 }
353 if (rightCount % 2 != 0 && leftCount % 2 != 0) {
354 return true;
355 }
356 else {
357 return false;
358 }
359 }
360
361
364 private static void loadHash() {
365 reservedWords.put( "abstract", "abstract" );
366 reservedWords.put( "do", "do" );
367 reservedWords.put( "inner", "inner" );
368 reservedWords.put( "public", "public" );
369 reservedWords.put( "var", "var" );
370 reservedWords.put( "boolean", "boolean" );
371 reservedWords.put( "continue", "continue" );
372 reservedWords.put( "int", "int" );
373 reservedWords.put( "return", "return" );
374 reservedWords.put( "void", "void" );
375 reservedWords.put( "break", "break" );
376 reservedWords.put( "else", "else" );
377 reservedWords.put( "interface", "interface" );
378 reservedWords.put( "short", "short" );
379 reservedWords.put( "volatile", "volatile" );
380 reservedWords.put( "byvalue", "byvalue" );
381 reservedWords.put( "extends", "extends" );
382 reservedWords.put( "long", "long" );
383 reservedWords.put( "static", "static" );
384 reservedWords.put( "while", "while" );
385 reservedWords.put( "case", "case" );
386 reservedWords.put( "final", "final" );
387 reservedWords.put( "naive", "naive" );
388 reservedWords.put( "super", "super" );
389 reservedWords.put( "transient", "transient" );
390 reservedWords.put( "cast", "cast" );
391 reservedWords.put( "float", "float" );
392 reservedWords.put( "new", "new" );
393 reservedWords.put( "rest", "rest" );
394 reservedWords.put( "catch", "catch" );
395 reservedWords.put( "for", "for" );
396 reservedWords.put( "null", "null" );
397 reservedWords.put( "synchronized", "synchronized" );
398 reservedWords.put( "char", "char" );
399 reservedWords.put( "finally", "finally" );
400 reservedWords.put( "operator", "operator" );
401 reservedWords.put( "this", "this" );
402 reservedWords.put( "class", "class" );
403 reservedWords.put( "generic", "generic" );
404 reservedWords.put( "outer", "outer" );
405 reservedWords.put( "switch", "switch" );
406 reservedWords.put( "const", "const" );
407 reservedWords.put( "goto", "goto" );
408 reservedWords.put( "package", "package" );
409 reservedWords.put( "throw", "throw" );
410 reservedWords.put( "double", "double" );
411 reservedWords.put( "if", "if" );
412 reservedWords.put( "private", "private" );
413 reservedWords.put( "true", "true" );
414 reservedWords.put( "default", "default" );
415 reservedWords.put( "import", "import" );
416 reservedWords.put( "protected", "protected" );
417 reservedWords.put( "try", "try" );
418 }
419 }
420