private void Fail(GOLD.ParseMessage msg)
{
switch (msg)
{
case GOLD.ParseMessage.LexicalError: //Cannot recognize token
throw new LexicalErrorException(parser.CurrentToken().Data, new SourceCodePosition(parser));
case GOLD.ParseMessage.SyntaxError: //Expecting a different token
throw new SyntaxErrorException(parser.CurrentToken().Data, parser.ExpectedSymbols().Text(), new SourceCodePosition(parser));
case GOLD.ParseMessage.InternalError: //INTERNAL ERROR! Something is horribly wrong.
throw new InternalErrorException(new SourceCodePosition(parser));
case GOLD.ParseMessage.NotLoadedError: //This error occurs if the CGT was not loaded.
throw new NotLoadedErrorException(new SourceCodePosition(parser));
case GOLD.ParseMessage.GroupError: //GROUP ERROR! Unexpected end of file
throw new GroupErrorException(new SourceCodePosition(parser));
}
}
public bool Parse(TextReader reader)
{
//This procedure starts the GOLD Parser Engine and handles each of the
//messages it returns. Each time a reduction is made, you can create new
//custom object and reassign the .CurrentReduction property. Otherwise,
//the system will use the Reduction object that was returned.
//
//The resulting tree will be a pure representation of the language
//and will be ready to implement.
GOLD.ParseMessage response;
bool done; //Controls when we leave the loop
bool accepted = false; //Was the parse successful?
parser.Open(reader);
parser.TrimReductions = false; //Please read about this feature before enabling
done = false;
while (!done)
{
response = parser.Parse();
switch (response)
{
case GOLD.ParseMessage.LexicalError:
//Cannot recognize token
FailMessage = "Lexical Error:\n" +
"Position: " + parser.CurrentPosition().Line + ", " + parser.CurrentPosition().Column + "\n" +
"Read: " + parser.CurrentToken().Data;
done = true;
break;
case GOLD.ParseMessage.SyntaxError:
//Expecting a different token
FailMessage = "Syntax Error:\n" +
"Position: " + parser.CurrentPosition().Line + ", " + parser.CurrentPosition().Column + "\n" +
"Read: " + parser.CurrentToken().Data + "\n" +
"Expecting: " + parser.ExpectedSymbols().Text();
done = true;
break;
case GOLD.ParseMessage.Reduction:
//For this project, we will let the parser build a tree of Reduction objects
//parser.CurrentReduction = CreateNewObject(parser.CurrentReduction);
break;
case GOLD.ParseMessage.Accept:
//Accepted!
Root = (GOLD.Reduction)parser.CurrentReduction; //The root node!
done = true;
accepted = true;
break;
case GOLD.ParseMessage.TokenRead:
//You don't have to do anything here.
break;
case GOLD.ParseMessage.InternalError:
//INTERNAL ERROR! Something is horribly wrong.
done = true;
break;
case GOLD.ParseMessage.NotLoadedError:
//This error occurs if the CGT was not loaded.
FailMessage = "Tables not loaded";
done = true;
break;
case GOLD.ParseMessage.GroupError:
//GROUP ERROR! Unexpected end of file
FailMessage = "Runaway group";
done = true;
break;
}
} //while
return(accepted);
}
public bool Parse(TextReader reader)
{
GOLD.ParseMessage response;
bool done; //Controls when we leave the loop
bool accepted = false; //Was the parse successful?
parser.Open(reader);
parser.TrimReductions = false; //Please read about this feature before enabling
done = false;
while (!done)
{
response = parser.Parse();
switch (response)
{
case GOLD.ParseMessage.LexicalError:
//Cannot recognize token
FailMessage = "Lexical Error:\n" +
"Position: " + parser.CurrentPosition().Line + ", " + parser.CurrentPosition().Column + "\n" +
"Read: " + parser.CurrentToken().Data;
done = true;
break;
case GOLD.ParseMessage.SyntaxError:
//Expecting a different token
FailMessage = "Syntax Error:\n" +
"Position: " + parser.CurrentPosition().Line + ", " + parser.CurrentPosition().Column + "\n" +
"Read: " + parser.CurrentToken().Data + "\n" +
"Expecting: " + parser.ExpectedSymbols().Text();
done = true;
break;
case GOLD.ParseMessage.Reduction:
//For this project, we will let the parser build a tree of Reduction objects
//parser.CurrentReduction = CreateNewObject(parser.CurrentReduction);
break;
case GOLD.ParseMessage.Accept:
//Accepted!
Root = (GOLD.Reduction)parser.CurrentReduction; //The root node!
done = true;
accepted = true;
break;
case GOLD.ParseMessage.TokenRead:
//You don't have to do anything here.
break;
case GOLD.ParseMessage.InternalError:
//INTERNAL ERROR! Something is horribly wrong.
done = true;
break;
case GOLD.ParseMessage.NotLoadedError:
//This error occurs if the CGT was not loaded.
FailMessage = "Tables not loaded";
done = true;
break;
case GOLD.ParseMessage.GroupError:
//GROUP ERROR! Unexpected end of file
FailMessage = "Runaway group";
done = true;
break;
}
} //while
return(accepted);
}
public override bool Parse(string source, out IReduction root)
{
//This procedure starts the GOLD Parser Engine and handles each of the
//messages it returns. Each time a reduction is made, you can create new
//custom object and reassign the .CurrentReduction property. Otherwise,
//the system will use the Reduction object that was returned.
//
//The resulting tree will be a pure representation of the language
//and will be ready to implement.
GOLD.ParseMessage response;
bool done; //Controls when we leave the loop
bool accepted = false; //Was the parse successful?
root = null;
StringReader reader = new StringReader(source);
parser.Open(reader);
parser.TrimReductions = false; //Please read about this feature before enabling
done = false;
while (!done)
{
response = parser.Parse();
switch (response)
{
case GOLD.ParseMessage.LexicalError:
//Cannot recognize token
failLineNumber = parser.CurrentPosition().Line;
failColumnNumber = parser.CurrentPosition().Column;
failLength = parser.CurrentToken().Data.ToString().Length;
failMessage = "Lexical Error:" + Environment.NewLine +
"Line " + (failLineNumber + 1) + ", Column " + (failColumnNumber + 1) + Environment.NewLine +
"Read: " + parser.CurrentToken().Data;
done = true;
break;
case GOLD.ParseMessage.SyntaxError:
//Expecting a different token
failLineNumber = parser.CurrentPosition().Line;
failColumnNumber = parser.CurrentPosition().Column;
failLength = parser.CurrentToken().Data.ToString().Length;
failMessage = "Syntax Error:" + Environment.NewLine +
"Line " + (failLineNumber + 1) + ", Column " + (failColumnNumber + 1) + Environment.NewLine +
"Read: " + parser.CurrentToken().Data + Environment.NewLine +
"Expecting one of: " + parser.ExpectedSymbols().Text();
done = true;
break;
case GOLD.ParseMessage.Reduction:
//For this project, we will let the parser build a tree of Reduction objects
// parser.CurrentReduction = CreateNewObject(parser.CurrentReduction);
break;
case GOLD.ParseMessage.Accept:
//Accepted!
root = new CookV5Reduction((GOLD.Reduction)parser.CurrentReduction); //The root node!
done = true;
accepted = true;
break;
case GOLD.ParseMessage.TokenRead:
//You don't have to do anything here.
break;
case GOLD.ParseMessage.InternalError:
//INTERNAL ERROR! Something is horribly wrong.
done = true;
break;
case GOLD.ParseMessage.NotLoadedError:
//This error occurs if the CGT was not loaded.
failLineNumber = 0;
failColumnNumber = 0;
failLength = 0;
failMessage = "Tables not loaded";
done = true;
break;
case GOLD.ParseMessage.GroupError:
//GROUP ERROR! Unexpected end of file
failLineNumber = 0;
failColumnNumber = 0;
failLength = 0;
failMessage = "COMMENT ERROR! Unexpected end of file";
done = true;
break;
}
} //while
return(accepted);
}
} // End of method Parse()
// Hooks to override if required to handle parsing events
protected void OnLexicalError()
{
FailMessage = "Lexical Error:\n" +
"Position: " + m_coreParser.CurrentPosition().Line + ", " + m_coreParser.CurrentPosition().Column + "\n" +
"Read: " + m_coreParser.CurrentToken().Data;
}