org.xmlbeam.util.intern.duplex.PostParseException Maven / Gradle / Ivy
/**
* Copyright 2015 Sven Ewald
*
* This file is part of JSONBeam.
*
* JSONBeam is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, any
* later version.
*
* JSONBeam is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with JSONBeam. If not, see
*
* @param currentTokenVal
* @param expectedTokenSequencesVal
* @param tokenImageVal
*/
public PostParseException(final Token currentTokenVal, final int[][] expectedTokenSequencesVal, final 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 PostParseException() {
super();
specialConstructor = false;
currentToken = null;
expectedTokenSequences = null;
tokenImage = null;
}
/**
* @param message
*/
public PostParseException(final String message) {
super(message);
specialConstructor = false;
currentToken = null;
expectedTokenSequences = null;
tokenImage = null;
}
/**
* This variable determines which constructor was used to create this object and thereby affects
* the semantics of the "getMessage" method (see below).
*/
protected final 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 final 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 final 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 final 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.
*/
@Override
public String getMessage() {
if (!specialConstructor) {
return super.getMessage();
}
String expected = "";
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 += tokenImage[expectedTokenSequences[i][j]] + " ";
}
if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
expected += "...";
}
expected += eol + " ";
}
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;
return retval;
}
/**
* The end of line string for this machine.
*/
protected final 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(final 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();
}
}
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