ParseException.java
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上传日期:2018-01-08
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- /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
- /**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- package org.apache.hadoop.record.compiler.generated;
- /**
- * This exception is thrown when parse errors are encountered.
- * You can explicitly create objects of this exception type by
- * calling the method generateParseException in the generated
- * parser.
- *
- * You can modify this class to customize your error reporting
- * mechanisms so long as you retain the public fields.
- */
- public class ParseException extends Exception {
- /**
- * This constructor is used by the method "generateParseException"
- * in the generated parser. Calling this constructor generates
- * a new object of this type with the fields "currentToken",
- * "expectedTokenSequences", and "tokenImage" set. The boolean
- * flag "specialConstructor" is also set to true to indicate that
- * this constructor was used to create this object.
- * This constructor calls its super class with the empty string
- * to force the "toString" method of parent class "Throwable" to
- * print the error message in the form:
- * ParseException: <result of getMessage>
- */
- public ParseException(Token currentTokenVal,
- int[][] expectedTokenSequencesVal,
- String[] tokenImageVal
- )
- {
- super("");
- specialConstructor = true;
- currentToken = currentTokenVal;
- expectedTokenSequences = expectedTokenSequencesVal;
- tokenImage = tokenImageVal;
- }
- /**
- * The following constructors are for use by you for whatever
- * purpose you can think of. Constructing the exception in this
- * manner makes the exception behave in the normal way - i.e., as
- * documented in the class "Throwable". The fields "errorToken",
- * "expectedTokenSequences", and "tokenImage" do not contain
- * relevant information. The JavaCC generated code does not use
- * these constructors.
- */
- public ParseException() {
- super();
- specialConstructor = false;
- }
- public ParseException(String message) {
- super(message);
- specialConstructor = false;
- }
- /**
- * This variable determines which constructor was used to create
- * this object and thereby affects the semantics of the
- * "getMessage" method (see below).
- */
- protected boolean specialConstructor;
- /**
- * This is the last token that has been consumed successfully. If
- * this object has been created due to a parse error, the token
- * followng this token will (therefore) be the first error token.
- */
- public Token currentToken;
- /**
- * Each entry in this array is an array of integers. Each array
- * of integers represents a sequence of tokens (by their ordinal
- * values) that is expected at this point of the parse.
- */
- public int[][] expectedTokenSequences;
- /**
- * This is a reference to the "tokenImage" array of the generated
- * parser within which the parse error occurred. This array is
- * defined in the generated ...Constants interface.
- */
- public String[] tokenImage;
- /**
- * This method has the standard behavior when this object has been
- * created using the standard constructors. Otherwise, it uses
- * "currentToken" and "expectedTokenSequences" to generate a parse
- * error message and returns it. If this object has been created
- * due to a parse error, and you do not catch it (it gets thrown
- * from the parser), then this method is called during the printing
- * of the final stack trace, and hence the correct error message
- * gets displayed.
- */
- public String getMessage() {
- if (!specialConstructor) {
- return super.getMessage();
- }
- StringBuffer expected = new StringBuffer();
- int maxSize = 0;
- for (int i = 0; i < expectedTokenSequences.length; i++) {
- if (maxSize < expectedTokenSequences[i].length) {
- maxSize = expectedTokenSequences[i].length;
- }
- for (int j = 0; j < expectedTokenSequences[i].length; j++) {
- expected.append(tokenImage[expectedTokenSequences[i][j]]).append(" ");
- }
- if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
- expected.append("...");
- }
- expected.append(eol).append(" ");
- }
- String retval = "Encountered "";
- Token tok = currentToken.next;
- for (int i = 0; i < maxSize; i++) {
- if (i != 0) retval += " ";
- if (tok.kind == 0) {
- retval += tokenImage[0];
- break;
- }
- retval += add_escapes(tok.image);
- tok = tok.next;
- }
- retval += "" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn;
- retval += "." + eol;
- if (expectedTokenSequences.length == 1) {
- retval += "Was expecting:" + eol + " ";
- } else {
- retval += "Was expecting one of:" + eol + " ";
- }
- retval += expected.toString();
- return retval;
- }
- /**
- * The end of line string for this machine.
- */
- protected String eol = System.getProperty("line.separator", "n");
-
- /**
- * Used to convert raw characters to their escaped version
- * when these raw version cannot be used as part of an ASCII
- * string literal.
- */
- protected String add_escapes(String str) {
- StringBuffer retval = new StringBuffer();
- char ch;
- for (int i = 0; i < str.length(); i++) {
- switch (str.charAt(i))
- {
- case 0 :
- continue;
- case 'b':
- retval.append("\b");
- continue;
- case 't':
- retval.append("\t");
- continue;
- case 'n':
- retval.append("\n");
- continue;
- case 'f':
- retval.append("\f");
- continue;
- case 'r':
- retval.append("\r");
- continue;
- case '"':
- retval.append("\"");
- continue;
- case ''':
- retval.append("\'");
- continue;
- case '\':
- retval.append("\\");
- continue;
- default:
- if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
- String s = "0000" + Integer.toString(ch, 16);
- retval.append("\u" + s.substring(s.length() - 4, s.length()));
- } else {
- retval.append(ch);
- }
- continue;
- }
- }
- return retval.toString();
- }
- }