Source Code Cross Referenced for ParseException.java in  » Ajax » Laszlo-4.0.10 » org » openlaszlo » sc » parser » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » Laszlo 4.0.10 » org.openlaszlo.sc.parser 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 2.1 */
002:        /* [The preceding line is no longer true: this file has been edited, and is
003:         no longer generated by JavaCC.  However, the comment on the first line
004:         is necessary to suppress a warning message when JavaCC is run.] */
005:
006:        /* ****************************************************************************
007:         * ParseException.java
008:         * ****************************************************************************/
009:
010:        /* J_LZ_COPYRIGHT_BEGIN *******************************************************
011:         * Copyright 2001-2007 Laszlo Systems, Inc.  All Rights Reserved.              *
012:         * Use is subject to license terms.                                            *
013:         * J_LZ_COPYRIGHT_END *********************************************************/
014:
015:        package org.openlaszlo.sc.parser;
016:
017:        import org.openlaszlo.sc.CompilerException;
018:
019:        /**
020:         * This exception is thrown when parse errors are encountered.
021:         * You can explicitly create objects of this exception type by
022:         * calling the method generateParseException in the generated
023:         * parser.
024:         *
025:         * You can modify this class to customize your error reporting
026:         * mechanisms so long as you retain the public fields.
027:         */
028:        public class ParseException extends CompilerException {
029:
030:            /**
031:             * This constructor is used by the method "generateParseException"
032:             * in the generated parser.  Calling this constructor generates
033:             * a new object of this type with the fields "currentToken",
034:             * "expectedTokenSequences", and "tokenImage" set.  The boolean
035:             * flag "specialConstructor" is also set to true to indicate that
036:             * this constructor was used to create this object.
037:             * This constructor calls its super class with the empty string
038:             * to force the "toString" method of parent class "Throwable" to
039:             * print the error message in the form:
040:             *     ParseException: <result of getMessage>
041:             */
042:            public ParseException(Token currentTokenVal,
043:                    int[][] expectedTokenSequencesVal, String[] tokenImageVal) {
044:                super ("");
045:                specialConstructor = true;
046:                currentToken = currentTokenVal;
047:                expectedTokenSequences = expectedTokenSequencesVal;
048:                tokenImage = tokenImageVal;
049:            }
050:
051:            /**
052:             * The following constructors are for use by you for whatever
053:             * purpose you can think of.  Constructing the exception in this
054:             * manner makes the exception behave in the normal way - i.e., as
055:             * documented in the class "Throwable".  The fields "errorToken",
056:             * "expectedTokenSequences", and "tokenImage" do not contain
057:             * relevant information.  The JavaCC generated code does not use
058:             * these constructors.
059:             */
060:
061:            public ParseException() {
062:                super ();
063:                specialConstructor = false;
064:            }
065:
066:            public ParseException(String message) {
067:                super (message);
068:                specialConstructor = false;
069:            }
070:
071:            public ParseException(Token currentTokenVal, String message) {
072:                super (message);
073:                specialConstructor = false;
074:                currentToken = currentTokenVal;
075:            }
076:
077:            /**
078:             * This variable determines which constructor was used to create
079:             * this object and thereby affects the semantics of the
080:             * "getMessage" method (see below).
081:             */
082:            protected boolean specialConstructor;
083:
084:            /**
085:             * This is the last token that has been consumed successfully.  If
086:             * this object has been created due to a parse error, the token
087:             * followng this token will (therefore) be the first error token.
088:             */
089:            public Token currentToken;
090:
091:            /**
092:             * Each entry in this array is an array of integers.  Each array
093:             * of integers represents a sequence of tokens (by their ordinal
094:             * values) that is expected at this point of the parse.
095:             */
096:            public int[][] expectedTokenSequences;
097:
098:            /**
099:             * This is a reference to the "tokenImage" array of the generated
100:             * parser within which the parse error occurred.  This array is
101:             * defined in the generated ...Constants interface.
102:             */
103:            public String[] tokenImage;
104:
105:            public int getBeginLine() {
106:                if (currentToken.next != null) {
107:                    return currentToken.next.beginLine;
108:                } else {
109:                    return -1;
110:                }
111:            }
112:
113:            public int getBeginColumn() {
114:                if (currentToken.next != null) {
115:                    return currentToken.next.beginColumn;
116:                } else {
117:                    return -1;
118:                }
119:            }
120:
121:            String pathname = null;
122:
123:            public String getPathname() {
124:                return pathname;
125:            }
126:
127:            public void initPathname(String pathname) {
128:                this .pathname = pathname;
129:            }
130:
131:            /**
132:             * This method has the standard behavior when this object has been
133:             * created using the standard constructors.  Otherwise, it uses
134:             * "currentToken" and "expectedTokenSequences" to generate a parse
135:             * error message and returns it.  If this object has been created
136:             * due to a parse error, and you do not catch it (it gets thrown
137:             * from the parser), then this method is called during the printing
138:             * of the final stack trace, and hence the correct error message
139:             * gets displayed.
140:             */
141:            public String getMessage() {
142:                return getMessage(true);
143:            }
144:
145:            public String getMessage(boolean includeSourceLocation) {
146:                if (!specialConstructor) {
147:                    String retval = super .getMessage();
148:                    if (currentToken != null && includeSourceLocation) {
149:                        retval += " at line " + currentToken.beginLine
150:                                + ", column " + currentToken.beginColumn;
151:                    }
152:                    return retval;
153:                }
154:                String expected = "";
155:                int expectedCount = 0;
156:                int maxSize = 0;
157:                boolean firstTime = true;
158:                for (int i = 0; i < expectedTokenSequences.length; i++) {
159:                    if (maxSize < expectedTokenSequences[i].length) {
160:                        maxSize = expectedTokenSequences[i].length;
161:                    }
162:                    String token = tokenImage[expectedTokenSequences[i][0]];
163:                    if (token.length() > 0 && token.charAt(0) == '"'
164:                            && token.charAt(token.length() - 1) == '"') {
165:                        token = token.substring(1, token.length() - 1);
166:                    }
167:                    if (token.charAt(0) != '#') {
168:                        if (!firstTime)
169:                            expected += ", ";
170:                        firstTime = false;
171:                        expected += token;
172:                        expectedCount += 1;
173:                    }
174:                }
175:                String tokenstr = "";
176:                Token tok = currentToken.next;
177:                for (int i = 0; i < maxSize; i++) {
178:                    if (i != 0)
179:                        tokenstr += " ";
180:                    if (tok.kind == 0) {
181:                        tokenstr += tokenImage[0];
182:                        break;
183:                    }
184:                    tokenstr += tok.image; //add_escapes(tok.image);
185:                    tok = tok.next;
186:                }
187:                String msg = "the token \"" + tokenstr
188:                        + "\" was not expected at this position";
189:                boolean showMismatchSolution = false;
190:                if (tokenstr.equals("#endAttribute")) {
191:                    msg = "the attribute value ended in mid-expression";
192:                    showMismatchSolution = true;
193:                }
194:                if (tokenstr.equals("#endAttributeStatements")) {
195:                    msg = "the attribute value ended in mid-statement";
196:                    showMismatchSolution = true;
197:                }
198:                if (tokenstr.equals("#endContent")) {
199:                    msg = "the element content ended in mid-program";
200:                    showMismatchSolution = true;
201:                }
202:                String retval = "Syntax error: " + msg;
203:                if (currentToken.next != null && includeSourceLocation) {
204:                    retval += " at line " + currentToken.next.beginLine
205:                            + ", column " + currentToken.next.beginColumn;
206:                }
207:                retval += ".";
208:                if (expectedCount == 1) {
209:                    retval += eol + "Was expecting " + expected;
210:                } else if (0 < expectedCount && expectedCount <= 5) {
211:                    retval += eol + "Was expecting one of: " + expected;
212:                } else if (showMismatchSolution) {
213:                    retval += eol + "Look for an unclosed '(', '{', or '['.";
214:                }
215:                return retval;
216:            }
217:
218:            /**
219:             * The end of line string for this machine.
220:             */
221:            protected String eol = System.getProperty("line.separator", "\n");
222:
223:            /**
224:             * Used to convert raw characters to their escaped version
225:             * when these raw version cannot be used as part of an ASCII
226:             * string literal.
227:             */
228:            protected String add_escapes(String str) {
229:                StringBuffer retval = new StringBuffer();
230:                char ch;
231:                for (int i = 0; i < str.length(); i++) {
232:                    switch (str.charAt(i)) {
233:                    case 0:
234:                        continue;
235:                    case '\b':
236:                        retval.append("\\b");
237:                        continue;
238:                    case '\t':
239:                        retval.append("\\t");
240:                        continue;
241:                    case '\n':
242:                        retval.append("\\n");
243:                        continue;
244:                    case '\f':
245:                        retval.append("\\f");
246:                        continue;
247:                    case '\r':
248:                        retval.append("\\r");
249:                        continue;
250:                    case '\"':
251:                        retval.append("\\\"");
252:                        continue;
253:                    case '\'':
254:                        retval.append("\\\'");
255:                        continue;
256:                    case '\\':
257:                        retval.append("\\\\");
258:                        continue;
259:                    default:
260:                        if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
261:                            String s = "0000" + Integer.toString(ch, 16);
262:                            retval.append("\\u"
263:                                    + s.substring(s.length() - 4, s.length()));
264:                        } else {
265:                            retval.append(ch);
266:                        }
267:                        continue;
268:                    }
269:                }
270:                return retval.toString();
271:            }
272:
273:        }
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