001:/*
002: * Copyright 2002-2006 The Apache Software Foundation.
003: *
004: * Licensed under the Apache License, Version 2.0 (the "License");
005: * you may not use this file except in compliance with the License.
006: * You may obtain a copy of the License at
007: *
008: * http://www.apache.org/licenses/LICENSE-2.0
009: *
010: * Unless required by applicable law or agreed to in writing, software
011: * distributed under the License is distributed on an "AS IS" BASIS,
012: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013: * See the License for the specific language governing permissions and
014: * limitations under the License.
015: */
016:/* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 2.1 */
017:package org.apache.commons.jexl.parser;
018:
019:public class TokenMgrError extends Error {
020: /** serialization version id jdk13 generated. */
021: static final long serialVersionUID = 2843513002462329650L;
022:
023: /*
024: * Ordinals for various reasons why an Error of this type can be thrown.
025: */
026:
027: /**
028: * Lexical error occured.
029: */
030: static final int LEXICAL_ERROR = 0;
031:
032: /**
033: * An attempt wass made to create a second instance of a static token
034: * manager.
035: */
036: static final int STATIC_LEXER_ERROR = 1;
037:
038: /**
039: * Tried to change to an invalid lexical state.
040: */
041: static final int INVALID_LEXICAL_STATE = 2;
042:
043: /**
044: * Detected (and bailed out of) an infinite loop in the token manager.
045: */
046: static final int LOOP_DETECTED = 3;
047:
048: /**
049: * Indicates the reason why the exception is thrown. It will have one of the
050: * above 4 values.
051: */
052: int errorCode;
053:
054: /**
055: * Replaces unprintable characters by their espaced (or unicode escaped)
056: * equivalents in the given string
057: */
058: protected static final String addEscapes(String str) {
059: StringBuffer retval = new StringBuffer();
060: char ch;
061: for (int i = 0; i < str.length(); i++) {
062: switch (str.charAt(i)) {
063: case 0:
064: continue;
065: case '\b':
066: retval.append("\\b");
067: continue;
068: case '\t':
069: retval.append("\\t");
070: continue;
071: case '\n':
072: retval.append("\\n");
073: continue;
074: case '\f':
075: retval.append("\\f");
076: continue;
077: case '\r':
078: retval.append("\\r");
079: continue;
080: case '\"':
081: retval.append("\\\"");
082: continue;
083: case '\'':
084: retval.append("\\\'");
085: continue;
086: case '\\':
087: retval.append("\\\\");
088: continue;
089: default:
090: if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
091: String s = "0000" + Integer.toString(ch, 16);
092: retval.append("\\u" + s.substring(s.length() - 4, s.length()));
093: } else {
094: retval.append(ch);
095: }
096: continue;
097: }
098: }
099: return retval.toString();
100: }
101:
102: /**
103: * Returns a detailed message for the Error when it is thrown by the token
104: * manager to indicate a lexical error. Parameters : EOFSeen : indicates if
105: * EOF caused the lexicl error curLexState : lexical state in which this
106: * error occured errorLine : line number when the error occured errorColumn :
107: * column number when the error occured errorAfter : prefix that was seen
108: * before this error occured curchar : the offending character Note: You can
109: * customize the lexical error message by modifying this method.
110: */
111: private static final String LexicalError(boolean EOFSeen, int lexState, int errorLine, int errorColumn,
112: String errorAfter, char curChar) {
113: return ("Lexical error at line " + errorLine + ", column " + errorColumn + ". Encountered: "
114: + (EOFSeen ? "<EOF> " : ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" + (int) curChar + "), ")
115: + "after : \"" + addEscapes(errorAfter) + "\"");
116: }
117:
118: /**
119: * You can also modify the body of this method to customize your error
120: * messages. For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE
121: * are not of end-users concern, so you can return something like :
122: *
123: * "Internal Error : Please file a bug report .... "
124: *
125: * from this method for such cases in the release version of your parser.
126: */
127: public String getMessage() {
128: return super .getMessage();
129: }
130:
131: /*
132: * Constructors of various flavors follow.
133: */
134:
135: public TokenMgrError() {
136: }
137:
138: public TokenMgrError(String message, int reason) {
139: super (message);
140: errorCode = reason;
141: }
142:
143: public TokenMgrError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter,
144: char curChar, int reason) {
145: this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter, curChar), reason);
146: }
147:}
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