Source Code Cross Referenced for ParseException.java in  » Template-Engine » freemarker-2.3.10 » freemarker » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Template Engine » freemarker 2.3.10 » freemarker.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2003 The Visigoth Software Society. All rights
003:         * reserved.
004:         *
005:         * Redistribution and use in source and binary forms, with or without
006:         * modification, are permitted provided that the following conditions
007:         * are met:
008:         *
009:         * 1. Redistributions of source code must retain the above copyright
010:         *    notice, this list of conditions and the following disclaimer.
011:         *
012:         * 2. Redistributions in binary form must reproduce the above copyright
013:         *    notice, this list of conditions and the following disclaimer in
014:         *    the documentation and/or other materials provided with the
015:         *    distribution.
016:         *
017:         * 3. The end-user documentation included with the redistribution, if
018:         *    any, must include the following acknowledgement:
019:         *       "This product includes software developed by the
020:         *        Visigoth Software Society (http://www.visigoths.org/)."
021:         *    Alternately, this acknowledgement may appear in the software itself,
022:         *    if and wherever such third-party acknowledgements normally appear.
023:         *
024:         * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
025:         *    project contributors may be used to endorse or promote products derived
026:         *    from this software without prior written permission. For written
027:         *    permission, please contact visigoths@visigoths.org.
028:         *
029:         * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030:         *    nor may "FreeMarker" or "Visigoth" appear in their names
031:         *    without prior written permission of the Visigoth Software Society.
032:         *
033:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036:         * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044:         * SUCH DAMAGE.
045:         * ====================================================================
046:         *
047:         * This software consists of voluntary contributions made by many
048:         * individuals on behalf of the Visigoth Software Society. For more
049:         * information on the Visigoth Software Society, please see
050:         * http://www.visigoths.org/
051:         */
052:
053:        package freemarker.core;
054:
055:        import freemarker.template.utility.SecurityUtilities;
056:
057:        /**
058:         * This exception is thrown when parse errors are encountered.
059:         * You can explicitly create objects of this exception type by
060:         * calling the method generateParseException in the generated
061:         * parser.
062:         *
063:         * You can modify this class to customize your error reporting
064:         * mechanisms so long as you retain the public fields.
065:         */
066:        public class ParseException extends java.io.IOException implements 
067:                FMParserConstants {
068:
069:            /**
070:             * This constructor is used by the method "generateParseException"
071:             * in the generated parser.  Calling this constructor generates
072:             * a new object of this type with the fields "currentToken",
073:             * "expectedTokenSequences", and "tokenImage" set.  The boolean
074:             * flag "specialConstructor" is also set to true to indicate that
075:             * this constructor was used to create this object.
076:             * This constructor calls its super class with the empty string
077:             * to force the "toString" method of parent class "Throwable" to
078:             * print the error message in the form:
079:             *     ParseException: <result of getMessage>
080:             */
081:            public ParseException(Token currentTokenVal,
082:                    int[][] expectedTokenSequencesVal, String[] tokenImageVal) {
083:                super ("");
084:                specialConstructor = true;
085:                currentToken = currentTokenVal;
086:                expectedTokenSequences = expectedTokenSequencesVal;
087:                tokenImage = tokenImageVal;
088:            }
089:
090:            /**
091:             * The following constructors are for use by you for whatever
092:             * purpose you can think of.  Constructing the exception in this
093:             * manner makes the exception behave in the normal way - i.e., as
094:             * documented in the class "Throwable".  The fields "errorToken",
095:             * "expectedTokenSequences", and "tokenImage" do not contain
096:             * relevant information.  The JavaCC generated code does not use
097:             * these constructors.
098:             */
099:
100:            protected ParseException() {
101:                super ();
102:                specialConstructor = false;
103:            }
104:
105:            /*
106:             public ParseException(String message) {
107:             super(message);
108:             specialConstructor = false;
109:             }
110:             */
111:
112:            public ParseException(String message, int lineNumber,
113:                    int columnNumber) {
114:                super (message);
115:                specialConstructor = false;
116:                this .lineNumber = lineNumber;
117:                this .columnNumber = columnNumber;
118:            }
119:
120:            public ParseException(String message, TemplateObject tobj) {
121:                super (message);
122:                specialConstructor = false;
123:                this .lineNumber = tobj.beginLine;
124:                this .columnNumber = tobj.beginColumn;
125:            }
126:
127:            /**
128:             * This variable determines which constructor was used to create
129:             * this object and thereby affects the semantics of the
130:             * "getMessage" method (see below).
131:             */
132:            protected boolean specialConstructor;
133:
134:            /**
135:             * This is the last token that has been consumed successfully.  If
136:             * this object has been created due to a parse error, the token
137:             * following this token will (therefore) be the first error token.
138:             */
139:            public Token currentToken;
140:
141:            public int columnNumber, lineNumber;
142:
143:            /**
144:             * Each entry in this array is an array of integers.  Each array
145:             * of integers represents a sequence of tokens (by their ordinal
146:             * values) that is expected at this point of the parse.
147:             */
148:            public int[][] expectedTokenSequences;
149:
150:            /**
151:             * This is a reference to the "tokenImage" array of the generated
152:             * parser within which the parse error occurred.  This array is
153:             * defined in the generated ...Constants interface.
154:             */
155:            public String[] tokenImage;
156:
157:            /**
158:             * This method has the standard behavior when this object has been
159:             * created using the standard constructors.  Otherwise, it uses
160:             * "currentToken" and "expectedTokenSequences" to generate a parse
161:             * error message and returns it.  If this object has been created
162:             * due to a parse error, and you do not catch it (it gets thrown
163:             * from the parser), then this method is called during the printing
164:             * of the final stack trace, and hence the correct error message
165:             * gets displayed.
166:             */
167:            public String getMessage() {
168:                if (!specialConstructor) {
169:                    return super .getMessage();
170:                }
171:                String retval = customGetMessage();
172:                if (retval != null) {
173:                    return retval;
174:                }
175:                // The default JavaCC message generation stuff follows.
176:                String expected = "";
177:                int maxSize = 0;
178:                for (int i = 0; i < expectedTokenSequences.length; i++) {
179:                    if (maxSize < expectedTokenSequences[i].length) {
180:                        maxSize = expectedTokenSequences[i].length;
181:                    }
182:                    for (int j = 0; j < expectedTokenSequences[i].length; j++) {
183:                        expected += tokenImage[expectedTokenSequences[i][j]]
184:                                + " ";
185:                    }
186:                    if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
187:                        expected += "...";
188:                    }
189:                    expected += eol + "    ";
190:                }
191:                retval = "Encountered \"";
192:                Token tok = currentToken.next;
193:                for (int i = 0; i < maxSize; i++) {
194:                    if (i != 0)
195:                        retval += " ";
196:                    if (tok.kind == 0) {
197:                        retval += tokenImage[0];
198:                        break;
199:                    }
200:                    retval += add_escapes(tok.image);
201:                    tok = tok.next;
202:                }
203:                retval += "\" at line " + currentToken.next.beginLine
204:                        + ", column " + currentToken.next.beginColumn;
205:                retval += "." + eol;
206:                if (expectedTokenSequences.length == 1) {
207:                    retval += "Was expecting:" + eol + "    ";
208:                } else {
209:                    retval += "Was expecting one of:" + eol + "    ";
210:                }
211:                retval += expected;
212:                return retval;
213:            }
214:
215:            public int getLineNumber() {
216:                return currentToken != null ? currentToken.next.beginLine
217:                        : lineNumber;
218:            }
219:
220:            public int getColumnNumber() {
221:                return currentToken != null ? currentToken.next.beginColumn
222:                        : columnNumber;
223:            }
224:
225:            // Custom message generation
226:
227:            private String customGetMessage() {
228:                Token nextToken = currentToken.next;
229:                int kind = nextToken.kind;
230:                if (kind == EOF) {
231:                    StringBuffer buf = new StringBuffer(
232:                            "Unexpected end of file reached.\n");
233:                    for (int i = 0; i < expectedTokenSequences.length; i++) {
234:                        int[] sequence = expectedTokenSequences[i];
235:                        switch (sequence[0]) {
236:                        case END_FOREACH:
237:                            buf.append("Unclosed foreach directive.\n");
238:                            break;
239:                        case END_LIST:
240:                            buf.append("Unclosed list directive.\n");
241:                            break;
242:                        case END_SWITCH:
243:                            buf.append("Unclosed switch directive.\n");
244:                            break;
245:                        case END_IF:
246:                            buf.append("Unclosed if directive.\n");
247:                            break;
248:                        case END_COMPRESS:
249:                            buf.append("Unclosed compress directive.\n");
250:                            break;
251:                        case END_MACRO:
252:                            buf.append("Unclosed macro directive.\n");
253:                            break;
254:                        case END_FUNCTION:
255:                            buf.append("Unclosed function directive.\n");
256:                            break;
257:                        case END_TRANSFORM:
258:                            buf.append("Unclosed transform directive.\n");
259:                            break;
260:                        case END_ESCAPE:
261:                            buf.append("Unclosed escape directive.\n");
262:                            break;
263:                        case END_NOESCAPE:
264:                            buf.append("Unclosed noescape directive.\n");
265:                            break;
266:                        }
267:                    }
268:                    return buf.toString();
269:                }
270:                if (kind == END_IF || kind == ELSE_IF || kind == ELSE) {
271:                    return "Found unexpected directive: "
272:                            + nextToken
273:                            + " on line "
274:                            + nextToken.beginLine
275:                            + ", column "
276:                            + nextToken.beginColumn
277:                            + "\nCheck whether you have a well-formed if-else block.";
278:                }
279:                return null;
280:            }
281:
282:            /**
283:             * The end of line string for this machine.
284:             */
285:            protected String eol = SecurityUtilities.getSystemProperty(
286:                    "line.separator", "\n");
287:
288:            /**
289:             * Used to convert raw characters to their escaped version
290:             * when these raw version cannot be used as part of an ASCII
291:             * string literal.
292:             */
293:            protected String add_escapes(String str) {
294:                StringBuffer retval = new StringBuffer();
295:                char ch;
296:                for (int i = 0; i < str.length(); i++) {
297:                    switch (str.charAt(i)) {
298:                    case 0:
299:                        continue;
300:                    case '\b':
301:                        retval.append("\\b");
302:                        continue;
303:                    case '\t':
304:                        retval.append("\\t");
305:                        continue;
306:                    case '\n':
307:                        retval.append("\\n");
308:                        continue;
309:                    case '\f':
310:                        retval.append("\\f");
311:                        continue;
312:                    case '\r':
313:                        retval.append("\\r");
314:                        continue;
315:                    case '\"':
316:                        retval.append("\\\"");
317:                        continue;
318:                    case '\'':
319:                        retval.append("\\\'");
320:                        continue;
321:                    case '\\':
322:                        retval.append("\\\\");
323:                        continue;
324:                    default:
325:                        if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
326:                            String s = "0000" + Integer.toString(ch, 16);
327:                            retval.append("\\u"
328:                                    + s.substring(s.length() - 4, s.length()));
329:                        } else {
330:                            retval.append(ch);
331:                        }
332:                        continue;
333:                    }
334:                }
335:                return retval.toString();
336:            }
337:
338:        }
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