// Initializes and runs Lexical Analysis module
public static void StartLexicalAnalyzer(string[] arguments)
{
ValidateArguments(arguments);
CommonTools.SetupOutputs(new string[] { GlobalConfiguration.LexicalAnalyzerOutputPath });
CommonTools.ClearOutputDisplays();
LexicalAnalyzer lexicalAnalyzer = new LexicalAnalyzer(arguments[0]);
CommonTools.DisplayHeader = lexicalAnalyzer.DisplayTokenHeader;
lexicalAnalyzer.DisplayTokenHeader();
while (lexicalAnalyzer.Token != Token.EndOfFileToken)
{
lexicalAnalyzer.GetNextToken();
lexicalAnalyzer.DisplayCurrentToken();
}
CommonTools.PromptProgramExit();
}
// InputStatement -> CharacterInToken RightShiftOperatorToken IdentifierToken InputEnd
private bool ProcessInputStatement()
{
if (!MatchToken(Token.CharacterInToken))
{
return(false);
}
if (!MatchToken(Token.RightShiftOperatorToken))
{
return(false);
}
VariableNode node = (VariableNode)SymbolTable.LookupNode(LexicalAnaylzer.Lexeme);
if (node == null)
{
CommonTools.PromptProgramErrorExit($"ERROR: Line {LexicalAnaylzer.LineNumber} Use of " +
$"undeclared variable \"{LexicalAnaylzer.Lexeme}\"");
return(false);
}
if (node.Type == Token.CharToken)
{
OutputThreeAddressCode($"\t_RDC {GetThreeAddressCodeName(LexicalAnaylzer.Lexeme)}");
}
else if (node.Type == Token.IntToken)
{
OutputThreeAddressCode($"\t_RDI {GetThreeAddressCodeName(LexicalAnaylzer.Lexeme)}");
}
else
{
OutputThreeAddressCode($"\t_RDF {GetThreeAddressCodeName(LexicalAnaylzer.Lexeme)}");
}
if (!MatchToken(Token.IdentifierToken))
{
return(false);
}
if (!ProcessInputEnd())
{
return(false);
}
return(true);
}
// Initializes and runs Three Address Code module
public static void StartThreeAddressCode(string[] arguments)
{
CommonTools.ThreeAddressCodeRun = true;
ValidateArguments(arguments);
CommonTools.SetupOutputs
(new string[] { GlobalConfiguration.ThreeAddressCodeOutputPath,
AppendFileExtension(arguments[0], "tac") });
CommonTools.ClearOutputDisplays();
LexicalAnalyzer lexicalAnalyzer = new LexicalAnalyzer(arguments[0]);
lexicalAnalyzer.GetNextToken();
SymbolTable symbolTable = new SymbolTable();
Parser parser = new Parser(lexicalAnalyzer, symbolTable);
parser.Start();
CommonTools.PromptProgramExit();
}
// Initializes and runs Parser module
public static void StartParser(string[] arguments)
{
ValidateArguments(arguments);
CommonTools.SetupOutputs(new string[] { GlobalConfiguration.ParserOutputPath });
CommonTools.ClearOutputDisplays();
LexicalAnalyzer lexicalAnalyzer = new LexicalAnalyzer(arguments[0]);
lexicalAnalyzer.GetNextToken();
SymbolTable symbolTable = new SymbolTable();
Parser parser = new Parser(lexicalAnalyzer, symbolTable);
if (parser.Start())
{
symbolTable.OutputSymbolTable(1);
}
CommonTools.WriteOutput($"Completed processing {Path.GetFileName(arguments[0])}");
CommonTools.PromptProgramExit();
}
// Displays expected tokens error to appropriate displays
private void DisplayExpectedTokensError(string expectedToken)
{
CommonTools.PromptProgramErrorExit($"ERROR: Line {LexicalAnaylzer.LineNumber} Expected token " +
$"\"{expectedToken}\" - Received token \"{LexicalAnaylzer.Token}\"");
}
// Returns the three address code variable name of the given lexeme
private string GetThreeAddressCodeName(string lexeme)
{
decimal n;
if (decimal.TryParse(lexeme, out n))
{
string temporaryVariable;
int x;
if (int.TryParse(lexeme, out x))
{
temporaryVariable = GetTemporaryVariableName(Token.IntToken);
}
else
{
temporaryVariable = GetTemporaryVariableName(Token.FloatToken);
}
OutputThreeAddressCode($"\t{temporaryVariable} = {SignOperation}{lexeme}");
SignOperation = string.Empty;
return(temporaryVariable);
}
Node node = SymbolTable.LookupNode(lexeme);
if (node is VariableNode)
{
if (node.Depth == GlobalConfiguration.BaseDepth)
{
return($"_{lexeme}");
}
else
{
return($"_BP" + ((VariableNode)node).Offset.ToString("+0;-#"));
}
}
else if (node is ConstantNode)
{
string temporaryVariable;
if ((((ConstantNode)node).Value != null))
{
temporaryVariable = GetTemporaryVariableName(Token.IntToken);
}
else
{
temporaryVariable = GetTemporaryVariableName(Token.FloatToken);
}
string outputvalue = (((ConstantNode)node).Value ?? ((ConstantNode)node).ValueReal).ToString();
OutputThreeAddressCode($"\t{temporaryVariable} = {SignOperation}{outputvalue}");
SignOperation = string.Empty;
return(temporaryVariable);
}
else if (node is FunctionNode)
{
CommonTools.PromptProgramErrorExit($"ERROR: Line {LexicalAnaylzer.LineNumber} Invalid use function {node.Lexeme}");
return(string.Empty);
}
else
{
return(lexeme);
}
}
// Writes given array of outputs to screen at index columns
public void OutputAssembly(string[] outputs)
{
CommonTools.WriteOutput(string.Format(OutputFormat, outputs));
}
// Initializes and runs Symbol Table module
public static void StartSymbolTable()
{
CommonTools.SetupOutputs(new string[] { GlobalConfiguration.SymbolTableOutputPath });
CommonTools.ClearOutputDisplays();
CommonTools.PromptProgramExit();
}