blob: 17706e104c77f51ec3f3add85c6aad9a4cc67c31 [file] [log] [blame]
/* Generated By:CSharpCC: Do not edit this line. ParseException.cs Version 3.2 */
/// <summary>
/// This exception is thrown when parse errors are encountered.
/// </summary>
/// <remarks>
/// You can explicitly create objects of this exception type by
/// calling the method GenerateParseException in the generated
/// parser.
/// <para>
/// You can modify this class to customize your error reporting
/// mechanisms so long as you retain the public fields.
/// </para>
/// </remarks>
public class ParseException : System.Exception {
/**
* 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. The boolean
* flag "specialConstructor" is also set to true to indicate that
* this constructor was used to create this object.
* This constructor calls its super class with the empty string
* to force the "toString" method of parent class "Throwable" to
* print the error message in the form:
* ParseException: result of getMessage
*/
public ParseException(Token currentTokenVal,
int[][] expectedTokenSequencesVal,
string[] tokenImageVal
) : base("") {
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 "Exception". The fields "errorToken",
* "expectedTokenSequences", and "tokenImage" do not contain
* relevant information. The CSharpCC generated code does not use
* these constructors.
*/
public ParseException() :
base() {
specialConstructor = false;
}
public ParseException(string message) :
base(message) {
specialConstructor = false;
}
/**
* This variable determines which constructor was used to create
* this object and thereby affects the semantics of the
* "getMessage" method (see below).
*/
protected bool 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 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 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 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.
*/
public override string Message {
get {
if (!specialConstructor) {
return base.Message;
}
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 += AddEscapes(tok.image);
tok = tok.next;
}
if (currentToken.next.kind == 0) {
retval += "\" after line ";
} else {
retval += "\" at line ";
}
retval += 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 string eol = System.Environment.NewLine;
/**
* 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 AddEscapes(string str) {
System.Text.StringBuilder retval = new System.Text.StringBuilder();
char ch;
for (int i = 0; i < str.Length; i++) {
switch (str[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[i]) < 0x20 || ch > 0x7e) {
string s = "0000" + System.Convert.ToString((int)ch, 16);
retval.Append("\\u" + s.Substring(s.Length - 4, s.Length - (s.Length - 4)));
} else {
retval.Append(ch);
}
continue;
}
}
return retval.ToString();
}
}