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/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package parser;
import java.util.ArrayList;
import org.antlr.v4.runtime.Token;
/**
*
* @author edwajohn
*/
public class ParserException extends Exception {
/**
* Create a ParserException. This is a convenience factory method to easily
* format your output to meet project specification.
*
* @param words the words being parsed
* @param i the index to the current word being parsed
* @return
*/
public static ParserException create(final ArrayList<? extends Token> words, final int i) {
String msg;
if (i < words.size()) {
msg = "Error parsing token \"" + words.get(i).getText() + "\" in \n ";
int preLen = 4;
for (int j = 0; j < i; ++j) {
Token token = words.get(j);
msg = msg + token.getText() + " ";
preLen += token.getText().length() + 1;
}
final int curLen = words.get(i).getText().length();
msg = msg + words.get(i).getText();
if (i < words.size() - 1) {
msg = msg + " ";
}
for (int j = i + 1; j < words.size(); ++j) {
Token token = words.get(j);
msg = msg + token.getText();
if (j < words.size() - 1) {
msg = msg + " ";
}
}
msg = msg + "\n";
for (int j = 0; j < preLen; ++j) {
msg += " ";
}
for (int j = 0; j < curLen; ++j) {
msg += "^";
}
} else {
msg = "Unexpectedly reached end of file in\n";
for (int j = 0; j < words.size(); ++j) {
Token token = words.get(j);
msg = msg + token.getText();
if (j < words.size() - 1) {
msg = msg + " ";
}
}
}
return new ParserException(msg);
}
/**
* Constructor. You will most likely NOT use this constructor directly, but
* rather use the convenience factory method create(). You may choose to use
* this constructor, however, if your data structures are set up differently
* than what the factory method expects.
*
* @param msg
*/
public ParserException(String msg) {
super(msg);
}
}
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