001    /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
002    package org.hackystat.telemetry.analyzer.language.parser.impl;
003    
004    /**
005     * This exception is thrown when parse errors are encountered.
006     * You can explicitly create objects of this exception type by
007     * calling the method generateParseException in the generated
008     * parser.
009     *
010     * You can modify this class to customize your error reporting
011     * mechanisms so long as you retain the public fields.
012     */
013    @SuppressWarnings("serial")
014    public class ParseException extends Exception {
015    
016      /**
017       * This constructor is used by the method "generateParseException"
018       * in the generated parser.  Calling this constructor generates
019       * a new object of this type with the fields "currentToken",
020       * "expectedTokenSequences", and "tokenImage" set.  The boolean
021       * flag "specialConstructor" is also set to true to indicate that
022       * this constructor was used to create this object.
023       * This constructor calls its super class with the empty string
024       * to force the "toString" method of parent class "Throwable" to
025       * print the error message in the form:
026       *     ParseException: <result of getMessage>
027       */
028      public ParseException(Token currentTokenVal,
029                            int[][] expectedTokenSequencesVal,
030                            String[] tokenImageVal
031                           )
032      {
033        super("");
034        specialConstructor = true;
035        currentToken = currentTokenVal;
036        expectedTokenSequences = expectedTokenSequencesVal;
037        tokenImage = tokenImageVal;
038      }
039    
040      /**
041       * The following constructors are for use by you for whatever
042       * purpose you can think of.  Constructing the exception in this
043       * manner makes the exception behave in the normal way - i.e., as
044       * documented in the class "Throwable".  The fields "errorToken",
045       * "expectedTokenSequences", and "tokenImage" do not contain
046       * relevant information.  The JavaCC generated code does not use
047       * these constructors.
048       */
049    
050      public ParseException() {
051        super();
052        specialConstructor = false;
053      }
054    
055      public ParseException(String message) {
056        super(message);
057        specialConstructor = false;
058      }
059    
060      /**
061       * This variable determines which constructor was used to create
062       * this object and thereby affects the semantics of the
063       * "getMessage" method (see below).
064       */
065      protected boolean specialConstructor;
066    
067      /**
068       * This is the last token that has been consumed successfully.  If
069       * this object has been created due to a parse error, the token
070       * following this token will (therefore) be the first error token.
071       */
072      public Token currentToken;
073    
074      /**
075       * Each entry in this array is an array of integers.  Each array
076       * of integers represents a sequence of tokens (by their ordinal
077       * values) that is expected at this point of the parse.
078       */
079      public int[][] expectedTokenSequences;
080    
081      /**
082       * This is a reference to the "tokenImage" array of the generated
083       * parser within which the parse error occurred.  This array is
084       * defined in the generated ...Constants interface.
085       */
086      public String[] tokenImage;
087    
088      /**
089       * This method has the standard behavior when this object has been
090       * created using the standard constructors.  Otherwise, it uses
091       * "currentToken" and "expectedTokenSequences" to generate a parse
092       * error message and returns it.  If this object has been created
093       * due to a parse error, and you do not catch it (it gets thrown
094       * from the parser), then this method is called during the printing
095       * of the final stack trace, and hence the correct error message
096       * gets displayed.
097       */
098      @Override
099      public String getMessage() {
100        if (!specialConstructor) {
101          return super.getMessage();
102        }
103        StringBuffer expected = new StringBuffer();
104        int maxSize = 0;
105        for (int i = 0; i < expectedTokenSequences.length; i++) {
106          if (maxSize < expectedTokenSequences[i].length) {
107            maxSize = expectedTokenSequences[i].length;
108          }
109          for (int j = 0; j < expectedTokenSequences[i].length; j++) {
110            expected.append(tokenImage[expectedTokenSequences[i][j]]).append(" ");
111          }
112          if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
113            expected.append("...");
114          }
115          expected.append(eol).append("    ");
116        }
117        String retval = "Encountered \"";
118        Token tok = currentToken.next;
119        for (int i = 0; i < maxSize; i++) {
120          if (i != 0) retval += " ";
121          if (tok.kind == 0) {
122            retval += tokenImage[0];
123            break;
124          }
125          retval += add_escapes(tok.image);
126          tok = tok.next; 
127        }
128        retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn;
129        retval += "." + eol;
130        if (expectedTokenSequences.length == 1) {
131          retval += "Was expecting:" + eol + "    ";
132        } else {
133          retval += "Was expecting one of:" + eol + "    ";
134        }
135        retval += expected.toString();
136        return retval;
137      }
138    
139      /**
140       * The end of line string for this machine.
141       */
142      protected String eol = System.getProperty("line.separator", "\n");
143     
144      /**
145       * Used to convert raw characters to their escaped version
146       * when these raw version cannot be used as part of an ASCII
147       * string literal.
148       */
149      protected String add_escapes(String str) {
150          StringBuffer retval = new StringBuffer();
151          char ch;
152          for (int i = 0; i < str.length(); i++) {
153            switch (str.charAt(i))
154            {
155               case 0 :
156                  continue;
157               case '\b':
158                  retval.append("\\b");
159                  continue;
160               case '\t':
161                  retval.append("\\t");
162                  continue;
163               case '\n':
164                  retval.append("\\n");
165                  continue;
166               case '\f':
167                  retval.append("\\f");
168                  continue;
169               case '\r':
170                  retval.append("\\r");
171                  continue;
172               case '\"':
173                  retval.append("\\\"");
174                  continue;
175               case '\'':
176                  retval.append("\\\'");
177                  continue;
178               case '\\':
179                  retval.append("\\\\");
180                  continue;
181               default:
182                  if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
183                     String s = "0000" + Integer.toString(ch, 16);
184                     retval.append("\\u" + s.substring(s.length() - 4, s.length()));
185                  } else {
186                     retval.append(ch);
187                  }
188                  continue;
189            }
190          }
191          return retval.toString();
192       }
193    
194    }