/* 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(); | |
} | |
} |