org.xmlbeam.util.intern.duplex.PostParseException Maven / Gradle / Ivy
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The coolest XML library for Java around. Define typesafe views (projections) to xml. Use XPath to read and write XML. Bind XML to Java collections. Requires at least Java6, supports Java8 features and has no further runtime dependencies.
/**
* 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();
}
}