/**
* 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.
*/
public ParseException(Token currentTokenVal,
int[][] expectedTokenSequencesVal,
string[] tokenImageVal
)
: base(initialise(currentTokenVal, expectedTokenSequencesVal, tokenImageVal))
{
currentToken = currentTokenVal;
expectedTokenSequences = expectedTokenSequencesVal;
tokenImage = tokenImageVal;
}
/**
* 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) the correct error message
* gets displayed.
*/
private static string initialise(Token currentToken,
int[][] expectedTokenSequences,
string[] tokenImage)
{
string eol = System.getProperty("line.separator", "\n");
StringBuilder expected = new StringBuilder();
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 += " " + tokenImage[tok.kind];
retval += " \"";
retval += add_escapes(tok.image);
retval += " \"";
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;
}
