//*******************************************************************************************
//*** FUNCTION ParseTerm
//*** ***************************************************************************************
//*** DESCRIPTION : parses an term str(int or symbol) to a symbol struct
//*** INPUT ARGS : SymbolTable symbolTable, string term, string currentLine=""
//*** OUTPUT ARGS : out Globals.Symbol? sym
//*** IN/OUT ARGS : N/A
//*** RETURN : bool rtnVal
//*******************************************************************************************
static bool ParseTerm(SymbolTable symbolTable, string term, out Globals.Symbol?sym, string currentLine)
{
bool rtnVal = true;
if (char.IsDigit(term[0]) || (term[0] == '-' && char.IsDigit(term[1])))
{
sym = null;
if (ParseNum(term, out Globals.Symbol? tmp, currentLine) == true)
{
sym = tmp;
}
else
{
Chronicler.LogDetailedInfo("Parse term(digit) in Expresion Handler failed");
rtnVal = false;
}
}
else
{
int Mval = 1;
if (term[0] == '-')
{
term.Substring(1, term.Length - 1);
Mval = -1;
}
Chronicler.LogDetailedInfo("Parse term(sym) start");
if ((symbolTable.SearchSymbol(term.Trim(), currentLine, out sym)) != true)
{
Chronicler.LogDetailedInfo("Parse term(sym) in Expresion Handler failed");
rtnVal = false;
}
if (sym.HasValue)
{
Globals.Symbol tmp = sym.Value;
tmp.value *= Mval;
sym = tmp;
}
Chronicler.LogDetailedInfo("Parse term(sym) end");
}
return(rtnVal);
}
//*******************************************************************************************
//*** FUNCTION ParseNum
//*** ***************************************************************************************
//*** DESCRIPTION : parses an int str to a symbol
//*** INPUT ARGS : string digits, string currentLine=""
//*** OUTPUT ARGS : out Globals.Symbol? sym
//*** IN/OUT ARGS : N/A
//*** RETURN : bool rtnVal
//*******************************************************************************************
static public bool ParseNum(string digits, out Globals.Symbol?sym, string currentLine = "")
{
Globals.Symbol tmp = default;
bool rtnVal = true;
if (int.TryParse(digits, out tmp.value) == true)
{
tmp.label = digits;
tmp.RFlag = false;
tmp.MFlag = false;
sym = tmp;
}
else
{
Chronicler.LogError("Unable to parse integer value(" + digits + "), skipping: \"" + currentLine + "\"", "Resolving Expresion");
sym = null;
rtnVal = false;
}
return(rtnVal);
}
public bool addSymbol(string label, bool rflag, int value, string currentLine)
{
label = label.Trim();
if (ValidateLabel(label, currentLine, "Pass One adding symbol"))
{
Globals.Symbol newSym = default;
newSym.label = label;
if (newSym.label.Length > 6)
{
newSym.label = newSym.label.Substring(0, 6);
}
newSym.RFlag = rflag;
newSym.value = value;
newSym.MFlag = false;
if (SymbolTableBST.ContainsKey(newSym.label))
{
Chronicler.LogError("Symbol with same Label('" + newSym.label + "') already exists! Setting MFlag and \n\tskipping: \"" + currentLine + "\"" + "\n", "Adding Symbol");
Globals.Symbol sym = SymbolTableBST.GetValueOrDefault(newSym.label);
if (sym.MFlag == false)
{
sym.MFlag = true;
SymbolTableBST.Remove(newSym.label);
SymbolTableBST.Add(newSym.label, sym);
}
return(false);
}
else
{
Chronicler.Write("Adding symbol: ", Chronicler.OutputOptions.INFO);
newSym.Print(Chronicler.OutputOptions.INFO);
SymbolTableBST.Add(newSym.label, newSym);
}
}
else
{
return(false);
}
return(true);
}
//************************************************************************
//*** FUNCTION LoadSymbols
//*** ********************************************************************
//*** DESCRIPTION : opens a file and populates SymbolTableBST
//*** INPUT ARGS : string filePath
//*** OUTPUT ARGS : N/A
//*** IN/OUT ARGS : N/A
//*** RETURN : N/A
//************************************************************************
public void LoadSymbols(string filePath)
{
Globals.Symbol symbol = default;
symbol.label = "";
symbol.IFlag = true;
char[] tmpLabel = new char[7];
//discard line flag
bool discardLine;
//get the line and trim whitespace
string currentLine;
string[] rflagAndValueStrings;
string rFlag;
try
{
using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.SequentialScan))
{
try
{
using (StreamReader streamReader = new StreamReader(fileStream))
{
while (!streamReader.EndOfStream)
{
//discard line flag
discardLine = false;
//get the line and trim whitespace
currentLine = streamReader.ReadLine().CompactAndTrimWhitespaces();
if (currentLine == "")
{
Chronicler.LogError("blank line, skipping: \"" + currentLine + "\"" + "\n", "Adding Symbol");
discardLine = true;
}
else if (currentLine.CountStringCharachters(':') != 1)//check incorrect colon seperator count
{
Chronicler.LogError("Extra colon seperators in current line, skipping: \"" + currentLine + "\"" + "\n", "Adding Symbol");
discardLine = true;
}
if (!discardLine)
{
string[] symbolSubstrings = currentLine.Split(':');
//validate Label
string label = symbolSubstrings[0].Trim();
discardLine = !ValidateLabel(label, currentLine, "Adding Symbol");
if (!discardLine)
{
rflagAndValueStrings = symbolSubstrings[1].Trim().Split(' ');
//validate RFlag
rFlag = rflagAndValueStrings[0].Trim();
discardLine = TestAndSetRFlag(rFlag, out symbol.RFlag, currentLine, "Adding Symbol");
if (!discardLine)
{
string value = rflagAndValueStrings[1].Trim();
if (!int.TryParse(value, out symbol.value) || value[0] == '+')
{
discardLine = true;
Chronicler.LogError("Invalid integer value(" + value + "), skipping: \"" + currentLine + "\"" + "\n", "Adding Symbol");
}
if (!discardLine)
{
//parse data into Symbol struct
int symbolLabelIndex = 0;
for (symbolLabelIndex = 0; symbolLabelIndex < 6 && symbolLabelIndex < label.Length; symbolLabelIndex++)
{
tmpLabel[symbolLabelIndex] = label[symbolLabelIndex];
}
tmpLabel[symbolLabelIndex] = '\0';
StringBuilder sb = new StringBuilder("");
foreach (char c in tmpLabel.TakeWhile(c => c != '\0'))
{
sb.Append(c);
}
symbol.label = sb.ToString().Trim();
symbol.MFlag = false;
if (SymbolTableBST.ContainsKey(symbol.label))
{
Chronicler.LogError("Symbol with same Label('" + symbol.label + "') already exists! Setting MFlag and \n\tskipping: \"" + currentLine + "\"" + "\n", "Adding Symbol");
Globals.Symbol sym = SymbolTableBST.GetValueOrDefault(symbol.label);
if (sym.MFlag == false)
{
sym.MFlag = true;
SymbolTableBST.Remove(symbol.label);
SymbolTableBST.Add(symbol.label, sym);
}
}
else
{
Chronicler.Write("Adding symbol: ", Chronicler.OutputOptions.INFO);
symbol.Print(Chronicler.OutputOptions.INFO);
SymbolTableBST.Add(symbol.label, symbol);
}
}
}
}
}
}
}
}
catch (IOException e)
{
Chronicler.LogError("failed to open File: " + filePath);
}
}
}
catch (IOException e)
{
Chronicler.LogError("failed to open File: " + filePath);
}
}