void ScanBlock(RandomAccessIterator <SourceLine> lines)
{
var ix = lines.Index;
var line = lines.Current;
var closures = new Stack <Token>();
closures.Push(line.Instruction);
while (lines.MoveNext() && closures.Count > 0)
{
if (lines.Current.Instruction != null)
{
if (lines.Current.Instruction.Name.Equals(_openClosures[closures.Peek().Name], Services.StringViewComparer))
{
closures.Pop();
}
else if (_openClosures.ContainsKey(lines.Current.Instruction.Name))
{
closures.Push(lines.Current.Instruction);
}
}
}
if (closures.Count > 0)
{
throw new SyntaxException(closures.Peek(),
$"Missing closure \"{_openClosures[closures.Peek().Name]}\" for directive \"{closures.Peek().Name}\".");
}
lines.SetIndex(ix);
}
static string ScanTo(char previousChar,
RandomAccessIterator <char> iterator,
Func <char, char, char, bool> terminal)
{
var tokenNameBuilder = new StringBuilder();
char c = iterator.Current;
tokenNameBuilder.Append(c);
if (!terminal(previousChar, c, iterator.PeekNext()))
{
previousChar = c;
c = iterator.GetNext();
while (!terminal(previousChar, c, iterator.PeekNext()))
{
tokenNameBuilder.Append(c);
if (char.IsWhiteSpace(c))
{
break;
}
previousChar = c;
c = iterator.GetNext();
}
}
return(tokenNameBuilder.ToString());
}
void DefineFunction(RandomAccessIterator <SourceLine> lines)
{
if (Services.CurrentPass == 0)
{
var line = lines.Current;
if (_currentBlock != null)
{
throw new SyntaxException(line.Instruction, "Function definition block cannot be inside another block.");
}
if (line.Label == null)
{
throw new SyntaxException(line.Instruction, "Function name not specified");
}
var functionName = line.Label.Name;
if (_functionDefs.ContainsKey(functionName))
{
throw new SyntaxException(line.Label, $"Function name \"{functionName}\" was previous declared.");
}
if (!Services.SymbolManager.SymbolIsValid(functionName))
{
throw new SyntaxException(line.Label, $"Invalid function name \"{functionName}\".");
}
_functionDefs.Add(functionName, new Function(line.Label.Name, line.Operands, lines, Services, Services.Options.CaseSensitive));
}
else
{
new FunctionBlock(Services, 1).SeekBlockEnd(lines);
}
}
/// <summary>
/// Assemble the parsed <see cref="SourceLine"/>.
/// </summary>
/// <param name="line">The line to assembly.</param>
/// <returns>The disassembly output from the assembly operation.</returns>
/// <exception cref="BlockClosureException"/>
/// <exception cref="DirectoryNotFoundException"/>
/// <exception cref="DivideByZeroException"/>
/// <exception cref="ExpressionException"/>
/// <exception cref="FileNotFoundException"/>
/// <exception cref="FormatException"/>
/// <exception cref="InvalidPCAssignmentException"/>
/// <exception cref="BlockAssemblerException"/>
/// <exception cref="OverflowException"/>
/// <exception cref="ProgramOverflowException"/>
/// <exception cref="ReturnException"/>
/// <exception cref="SectionException"/>
/// <exception cref="SymbolException"/>
/// <exception cref="SyntaxException"/>
public string Assemble(RandomAccessIterator <SourceLine> lines)
{
var first = lines.Current;
bool isSpecial = first.Label != null && first.Label.IsSpecialOperator();
PCOnAssemble = Services.Output.LogicalPC;
if (first.Label != null && !first.Label.Name.Equals("*"))
{
if (isSpecial)
{
Services.SymbolManager.DefineLineReference(first.Label, PCOnAssemble);
}
else if (first.Instruction == null || !ExcludedInstructionsForLabelDefines.Contains(first.Instruction.Name))
{
DefineLabel(first.Label, PCOnAssemble, true);
}
}
if (first.Instruction != null)
{
return(OnAssemble(lines));
}
if (first.Label != null && !isSpecial)
{
var symbol = Services.SymbolManager.GetSymbol(first.Label, false);
if (symbol != null && symbol.IsNumeric && symbol.StorageType == StorageType.Scalar && !double.IsNaN(symbol.NumericValue))
{
return(string.Format(".{0}{1}",
((int)symbol.NumericValue).ToString("x4").PadRight(42),
Services.Options.NoSource ? string.Empty : first.Source));
}
}
return(string.Empty);
}
/// <summary>
/// Cleanup the current block's scope.
/// </summary>
/// <param name="iterator">The source line iterator.</param>
public void PopScope(RandomAccessIterator <SourceLine> iterator)
{
SeekBlockEnd(iterator);
if (_createScope)
{
Services.SymbolManager.PopScope();
}
}
/// <summary>
/// Gets a string from the tokenized expression.
/// </summary>
/// <param name="iterator">The iterator to the tokenized expression.</param>
/// <param name="services">The shared assembly services.</param>
/// <returns></returns>
public static string GetString(RandomAccessIterator <Token> iterator, AssemblyServices services)
{
if (iterator.Current == null && !iterator.MoveNext())
{
return(string.Empty);
}
var token = iterator.Current;
if (IsStringLiteral(iterator))
{
iterator.MoveNext();
return(Regex.Unescape(token.Name.ToString()).TrimOnce('"'));
}
else if (token.Type == TokenType.Function && token.Name.Equals("format", services.StringComparison))
{
var str = GetFormatted(iterator, services);
if (!string.IsNullOrEmpty(str) && Token.IsEnd(iterator.Current))
{
return(str);
}
}
else if (token.Type == TokenType.Function && token.Name.Equals("char", services.StringComparison))
{
var code = (int)services.Evaluator.Evaluate(iterator, 0, 0x10FFFF);
return(char.ConvertFromUtf32(services.Encoding.GetCodePoint(code)));
}
else if (token.Type == TokenType.Operand &&
(char.IsLetter(token.Name[0]) || token.Name[0] == '_') &&
!services.Evaluator.IsReserved(token.Name))
{
var sym = services.SymbolManager.GetSymbol(token, services.CurrentPass > 0);
if (sym == null)
{
return(string.Empty);
}
if (sym.DataType == DataType.String)
{
if ((!iterator.MoveNext() || Token.IsEnd(iterator.Current)) && sym.StorageType == StorageType.Scalar)
{
return(sym.StringValue.TrimOnce('"').ToString());
}
else if (sym.StorageType == StorageType.Vector && iterator.Current.Name.Equals("["))
{
var current = iterator.Current;
var subscript = (int)services.Evaluator.Evaluate(iterator);
if (Token.IsEnd(iterator.Current))
{
if (subscript >= 0 && subscript < sym.StringVector.Count)
{
return(sym.StringVector[subscript].ToString());
}
throw new SyntaxException(current, "Index out of range.");
}
}
}
}
throw new SyntaxException(token, "Type mismatch.");
}
public override void ExecuteDirective(RandomAccessIterator <SourceLine> iterator)
{
var line = iterator.Current;
if (_ifTrue)
{
SeekBlockEnd(iterator);
}
else
{
while (line != null && !line.Instruction.Name.Equals(".endif", Services.StringComparison) && !_ifTrue)
{
if (iterator.Current.Instruction == null)
{
continue;
}
var instruction = Services.Options.CaseSensitive ? line.Instruction.Name.ToString() :
line.Instruction.Name.ToLower();
if (instruction.StartsWith(".if"))
{
EvaluateCondition(line);
}
else
{
if (!instruction.Equals(".endif"))
{
if (_elseEvaluated)
{
throw new SyntaxException(iterator.Current.Instruction,
$"Invalid use of \"{instruction}\" directive.");
}
_elseEvaluated = instruction.Equals(".else");
if (_elseEvaluated)
{
if (line.Operands.Count > 0)
{
throw new SyntaxException(line.Operands[0], "Unexpected expression.");
}
break;
}
EvaluateCondition(line);
}
}
if (_ifTrue)
{
break;
}
SeekBlockDirectives(iterator, Reserved.GetReserved("Keywords").ToArray());
line = iterator.Current;
}
if (line == null)
{
throw new SyntaxException(line.Instruction, $"Missing \".endif\" directive.");
}
}
}
public double EvaluateFunction(RandomAccessIterator <Token> tokens)
{
tokens.MoveNext();
var param = tokens.GetNext();
if (param.Equals(")"))
{
throw new SyntaxException(param.Position, "Expected argument not provided.");
}
var symbolLookup = Services.SymbolManager.GetSymbol(param, false);
if (symbolLookup == null)
{
if (param.Type != TokenType.Operand || !char.IsLetter(param.Name[0]) || param.Name[0] != '_')
{
throw new SyntaxException(param.Position, "Function \"len\" expects a symbol.");
}
if (Services.CurrentPass > 0)
{
throw new SymbolException(param, SymbolException.ExceptionReason.NotDefined);
}
Services.PassNeeded = true;
return(0);
}
param = tokens.GetNext();
if (!param.Name.Equals(")"))
{
param = tokens.GetNext();
int subscript = -1;
if (param.Name.Equals("["))
{
subscript = (int)Services.Evaluator.Evaluate(tokens, 0, int.MaxValue);
}
if (subscript < 0 || !tokens.PeekNext().Equals(")"))
{
throw new SyntaxException(param.Position, "Unexpected argument.");
}
if (symbolLookup.StorageType != StorageType.Vector)
{
throw new SyntaxException(param.Position, "Type mismatch.");
}
if (symbolLookup.DataType == DataType.String)
{
if (subscript >= symbolLookup.StringVector.Count)
{
throw new SyntaxException(param.Position, "Index out of range.");
}
return(symbolLookup.StringVector[subscript].Length);
}
if (subscript >= symbolLookup.NumericVector.Count)
{
throw new SyntaxException(param.Position, "Index out of range.");
}
return(symbolLookup.NumericVector[subscript].Size());
}
return(symbolLookup.Length);
}
/// <summary>
/// Constructs a new instance of a <see cref="RandomAccessIterator{T}"/> class.
/// </summary>
/// <param name="iterator">An iterator from which to copy.</param>
/// <exception cref="ArgumentNullException"></exception>
public RandomAccessIterator(RandomAccessIterator <T> iterator)
{
if (iterator == null)
{
throw new ArgumentNullException();
}
_firstIndex = iterator._firstIndex;
Index = iterator.Index;
_list = iterator._list;
}
/// <summary>
/// Constructs a new instance of a <see cref="RandomAccessIterator{T}"/> class.
/// </summary>
/// <param name="iterator">An iterator from which to copy.</param>
/// <param name="reset">Reset the copied indicator.</param>
/// <exception cref="ArgumentNullException"></exception>
public RandomAccessIterator(RandomAccessIterator <T> iterator, bool reset)
{
if (iterator == null)
{
throw new ArgumentNullException();
}
_firstIndex = iterator._firstIndex;
_list = iterator._list;
_length = iterator._length;
Index = reset ? _firstIndex : iterator.Index;
}
/// <summary>
/// Gets the formatted string from the tokenized expression.
/// </summary>
/// <param name="iterator">The iterator to the tokenized expression.</param>
/// <param name="services">The shared assembly services.</param>
/// <returns></returns>
public static string GetFormatted(RandomAccessIterator <Token> iterator, AssemblyServices services)
{
iterator.MoveNext();
var format = iterator.GetNext();
if (Token.IsEnd(format))
{
return(null);
}
string fmt;
if (!format.IsDoubleQuote())
{
if (format.Type != TokenType.Function && !format.Name.Equals("format", services.StringComparison))
{
return(null);
}
fmt = GetFormatted(iterator, services);
}
else
{
fmt = Regex.Unescape(format.Name.TrimOnce('"').ToString());
}
var parms = new List <object>();
if (iterator.MoveNext())
{
while (!Token.IsEnd(iterator.GetNext()))
{
if (ExpressionIsAString(iterator, services))
{
parms.Add(GetString(iterator, services));
}
else
{
var parmVal = services.Evaluator.Evaluate(iterator, false);
if (Regex.IsMatch(fmt, $"\\{{{parms.Count}(,-?\\d+)?:(d|D|x|X)\\d*\\}}"))
{
parms.Add((int)parmVal);
}
else
{
parms.Add(parmVal);
}
}
}
}
if (parms.Count == 0)
{
return(fmt);
}
return(string.Format(fmt, parms.ToArray()));
}
void DoPop(RandomAccessIterator <SourceLine> lines)
{
_currentBlock.PopScope(lines);
_blocks.Pop();
if (_blocks.Count > 0)
{
_currentBlock = _blocks.Peek();
}
else
{
_currentBlock = null;
}
}
void DoGoto(SourceLine line)
{
if (!line.OperandHasToken)
{
Assembler.Log.LogEntry(line, line.Instruction, "Destination not specified for \".goto\" directive.");
return;
}
var gotoExp = line.OperandExpression;
if (gotoExp.Equals(line.LabelName))
{
Assembler.Log.LogEntry(line, line.Instruction, "Destination cannot be the same line as \".goto\" directive.");
return;
}
var iterCopy = new RandomAccessIterator <SourceLine>(Assembler.LineIterator);
iterCopy.Reset();
SourceLine currLine;
while ((currLine = iterCopy.Skip(l => !l.LabelName.Equals(gotoExp))) != null)
{
if (currLine.InstructionName.Contains("=") ||
currLine.InstructionName.Equals(".equ") ||
currLine.Instruction.Equals(".let"))
{
Assembler.Log.LogEntry(line, line.Instruction, $"\"{gotoExp}\" is not a valid destination.");
return;
}
if (iterCopy.Index >= Assembler.LineIterator.Index)
{
Assembler.LineIterator.FastForward(iterCopy.Index);
}
else
{
if (iterCopy.Index == 0)
{
Assembler.LineIterator.Reset();
}
else
{
Assembler.LineIterator.Rewind(iterCopy.Index);
}
}
return;
}
Assembler.Log.LogEntry(line, line.Instruction,
$"Could not find destination \"{gotoExp}\".");
}
public override void ExecuteDirective(RandomAccessIterator <SourceLine> lines)
{
var line = lines.Current;
if (line.Operands.Count > 0)
{
throw new SyntaxException(line.Operands[0], "Unexpected expression.");
}
if (line.Instruction.Name.Equals(".endpage", Services.StringComparison))
{
if (!Services.PassNeeded && GetPage(Services.Output.LogicalPC - 1) != _page)
{
Services.Log.LogEntry(line.Instruction, "Page boundary crossed.");
}
}
}
/// <summary>
/// Determines whether the tokenized expression is a string.
/// </summary>
/// <param name="iterator">The iterator to the tokenized expression.</param>
/// <param name="services">The shared assembly services.</param>
/// <returns></returns>
public static bool ExpressionIsAString(RandomAccessIterator <Token> iterator, AssemblyServices services)
{
var token = iterator.Current;
if (token.IsDoubleQuote())
{
return(token.Name.Length > 2 && Token.IsEnd(iterator.PeekNext()));
}
var ix = iterator.Index;
var result = false;
if (token.Type == TokenType.Function &&
(token.Name.Equals("format", services.StringComparison) || token.Name.Equals("char", services.StringComparison)))
{
iterator.MoveNext();
var parms = Token.GetGroup(iterator);
var last = iterator.Current;
result = Token.IsEnd(last);
if (token.Name.Equals("char", services.StringComparison))
{
result &= services.Evaluator.Evaluate(parms.GetIterator(), 0, 0x10FFFF).IsInteger();
}
}
else if (token.Type == TokenType.Operand &&
(char.IsLetter(token.Name[0]) || token.Name[0] == '_') &&
!services.Evaluator.IsReserved(token.Name))
{
var sym = services.SymbolManager.GetSymbol(token, false);
if (sym != null)
{
if (iterator.MoveNext() && iterator.Current.Name.Equals("["))
{
var subscript = (int)services.Evaluator.Evaluate(iterator);
result = Token.IsEnd(iterator.Current) &&
subscript >= 0 && subscript < sym.StringVector.Count;
}
else
{
result = Token.IsEnd(iterator.Current) &&
sym.StorageType == StorageType.Scalar &&
sym.DataType == DataType.String;
}
}
}
iterator.SetIndex(ix);
return(result);
}
/// <summary>
/// Creates a new instance of the Function class.
/// </summary>
/// <param name="name">The function's name.</param>
/// <param name="parameterList">The list of parameters for the function.</param>
/// <param name="iterator">The <see cref="SourceLine"/> iterator to traverse to define the function block.</param>
/// <param name="services">The shared <see cref="AssemblyServices"/> object.</param>
/// <param name="caseSensitive">Determines whether to compare the passed parameters
/// to the source block's own defined parameters should be case-sensitive.</param>
/// <exception cref="SyntaxException"></exception>
public Function(StringView name,
List <Token> parameterList,
RandomAccessIterator <SourceLine> iterator,
AssemblyServices services,
bool caseSensitive)
: base(parameterList,
caseSensitive)
{
Name = name;
_services = services;
_definedLines = new List <SourceLine>();
SourceLine line;
while ((line = iterator.GetNext()) != null)
{
if (line.Label != null && line.Label.Name.Equals("+"))
{
_services.Log.LogEntry(line.Label,
"Anonymous labels are not supported inside functions.", false);
}
if (line.Instruction != null)
{
if (line.Instruction.Name.Equals(".global", _services.StringViewComparer))
{
throw new SyntaxException(line.Instruction,
$"Directive \".global\" not allowed inside a function block.");
}
if (line.Instruction.Name.Equals(".endfunction", _services.StringViewComparer))
{
if (line.Operands.Count > 0)
{
throw new SyntaxException(line.Operands[0],
"Unexpected expression found after \".endfunction\" directive.");
}
break;
}
}
_definedLines.Add(line);
}
if (line == null)
{
throw new SyntaxException(iterator.Current.Instruction,
"Function definition does not have a closing \".endfunction\" directive.");
}
}
/// <summary>
/// Seeks the <see cref="SourceLine"/> containing the
/// first instance one of the directives in the block.
/// </summary>
/// <param name="iterator">The source line iterator.</param>
/// <param name="directives">An array of directives, one of which to seek in the block.</param>
protected void SeekBlockDirectives(RandomAccessIterator <SourceLine> iterator, StringView[] directives)
{
var line = iterator.Current;
if (!line.Instruction.Name.Equals(BlockClosure, Services.StringComparison))
{
var blockClose = BlockClosure;
var keywordsNotToSkip = new List <StringView>(directives)
{
blockClose
};
keywordsNotToSkip.AddRange(BlockOpens.Select(bo => new StringView(bo)));
var opens = 1;
while (opens != 0)
{
line = iterator.FirstOrDefault(l => l.Instruction != null && keywordsNotToSkip.Contains(l.Instruction.Name, Services.StringViewComparer));
if (line == null)
{
throw new BlockClosureException(BlockOpens.First());
}
if (BlockOpens.Contains(line.Instruction.Name.ToString(), Services.StringComparer))
{
opens++;
}
if (opens < 2 && directives.Contains(line.Instruction.Name, Services.StringViewComparer))
{
break;
}
if (line.Instruction.Name.Equals(blockClose, Services.StringComparison))
{
opens--;
}
}
}
}
protected override string OnAssemble(RandomAccessIterator <SourceLine> lines)
{
var line = lines.Current;
if (Reserved.IsOneOf("CPU", line.Instruction.Name))
{
var iterator = line.Operands.GetIterator();
if (!iterator.MoveNext() || !StringHelper.IsStringLiteral(iterator) || iterator.PeekNext() != null)
{
Services.Log.LogEntry(line.Instruction,
"String expression expected.");
}
else
{
CPU = iterator.Current.Name.ToString().TrimOnce('"');
OnSetCpu();
}
return(string.Empty);
}
Evaluations[0] = Evaluations[1] = Evaluations[2] = double.NaN;
return(AssembleCpuInstruction(line));
}
/// <summary>
/// Gets a grouping of tokens.
/// </summary>
/// <param name="tokens">The iterator to the full token expression.</param>
/// <returns>The grouped tokens</returns>
public static IEnumerable <Token> GetGroup(RandomAccessIterator <Token> tokens)
{
var list = new List <Token> {
tokens.Current
};
var open = tokens.Current.Name;
var closed = OpenClose[open];
var opens = 1;
while (tokens.MoveNext() && opens > 0)
{
list.Add(tokens.Current);
if (tokens.Current.Name.Equals(open))
{
opens++;
}
else if (tokens.Current.Name.Equals(closed))
{
opens--;
}
}
return(list);
}
double CallFunction(RandomAccessIterator <Token> tokens, bool returnValueExpected)
{
var functionToken = tokens.Current;
var functionName = functionToken.Name;
tokens.MoveNext();
var evalParms = new List <object>();
Token token = tokens.GetNext();
while (!token.Name.Equals(")"))
{
if (token.IsSeparator())
{
tokens.MoveNext();
}
if (StringHelper.ExpressionIsAString(tokens, Services))
{
evalParms.Add(StringHelper.GetString(tokens, Services));
}
else
{
evalParms.Add(Services.Evaluator.Evaluate(tokens, false));
}
token = tokens.Current;
}
Services.SymbolManager.PushScopeEphemeral();
var value = _functionDefs[functionName].Invoke(evalParms);
Services.SymbolManager.PopScopeEphemeral();
if (double.IsNaN(value) && returnValueExpected)
{
throw new ReturnException(functionToken.Position,
$"Function name \"{functionName}\" did not return a value.");
}
return(value);
}
protected override string OnAssemble(RandomAccessIterator <SourceLine> lines)
{
var line = lines.Current;
var instruction = line.Instruction.Name.ToLower();
var iterator = line.Operands.GetIterator();
switch (instruction)
{
case ".assert":
DoAssert(line);
break;
case ".bank":
SetBank(line);
break;
case ".warnif":
case ".errorif":
ThrowConditional(line);
break;
case ".echo":
case ".error":
case ".warn":
if (instruction.Equals(".echo"))
{
if (iterator.MoveNext() && StringHelper.ExpressionIsAString(iterator, Services))
{
Output(line, StringHelper.GetString(iterator, Services));
}
else if (Services.Evaluator.ExpressionIsCondition(line.Operands.GetIterator()))
{
Output(line, Services.Evaluator.EvaluateCondition(iterator, false).ToString());
}
else
{
Output(line, Services.Evaluator.Evaluate(iterator, false, Evaluator.CbmFloatMinValue, Evaluator.CbmFloatMaxValue).ToString());
}
}
else if (iterator.MoveNext() && StringHelper.ExpressionIsAString(iterator, Services))
{
Output(line, StringHelper.GetString(iterator, Services));
}
else
{
Services.Log.LogEntry(line.Instruction, "String expression expected.");
}
if (iterator.Current != null)
{
throw new SyntaxException(iterator.Current, "Unexpected expression.");
}
break;
case ".eor":
SetEor(line);
break;
case ".forcepass":
if (line.Operands.Count > 0)
{
Services.Log.LogEntry(line.Operands[0], "Unexpected expression.");
}
else if (Services.CurrentPass == 0)
{
Services.PassNeeded = true;
}
break;
case ".invoke":
InvokeFunction(line);
break;
case ".proff":
case ".pron":
if (line.Operands.Count > 0)
{
Services.Log.LogEntry(line.Operands[0], "Unexpected expression.");
}
else
{
Services.PrintOff = instruction.Equals(".proff");
}
break;
case ".dsection":
DefineSection(line);
break;
case ".section":
return(SetSection(line));
case ".format":
case ".target":
if (Services.CurrentPass == 0)
{
if (Services.Output.HasOutput)
{
Services.Log.LogEntry(line.Instruction, "Cannot specify target format after assembly has started.");
}
else
{
if (!iterator.MoveNext() || !StringHelper.ExpressionIsAString(iterator, Services))
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position,
"Expression must be a string.");
}
else if (!string.IsNullOrEmpty(Services.OutputFormat))
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position,
"Output format was previously specified.");
}
else
{
Services.SelectFormat(StringHelper.GetString(iterator, Services));
}
if (iterator.Current != null)
{
Services.Log.LogEntry(iterator.Current, "Unexpected expression.");
}
}
if (instruction.Equals(".target"))
{
Services.Log.LogEntry(line.Instruction,
"\".target\" is deprecated. Use \".format\" instead.", false);
}
}
break;
default:
InitMem(line);
break;
}
return(string.Empty);
}
public void InvokeFunction(RandomAccessIterator <Token> tokens) => CallFunction(tokens, false);
public double EvaluateFunction(RandomAccessIterator <Token> tokens) => CallFunction(tokens, true);
string DoGoto(RandomAccessIterator <SourceLine> lines)
{
var line = lines.Current;
if (line.Operands.Count == 0)
{
throw new SyntaxException(line.Instruction.Position,
"Destination not specified for \".goto\" directive.");
}
var gotoExp = line.Operands[0].Name;
if ((!char.IsLetter(gotoExp[0]) && gotoExp[0] != '_') || line.Operands.Count > 1)
{
Services.Log.LogEntry(line.Operands[0],
"\".goto\" operand must be a label.");
}
else if (line.Label != null && gotoExp.Equals(line.Label.Name, Services.StringViewComparer))
{
Services.Log.LogEntry(line.Instruction,
"Destination cannot be the same line as \".goto\" directive.");
}
else
{
var iterCopy = new RandomAccessIterator <SourceLine>(lines, true);
SourceLine currLine;
if ((currLine = iterCopy.FirstOrDefault(l =>
{
if (l.Instruction != null && _openClosures.ContainsKey(l.Instruction.Name))
{
if (l.Instruction.Name.Equals(".function", Services.StringComparison))
{
throw new SyntaxException(l.Instruction, "Function block cannot be inside another block.");
}
// leap over any blocks we find along the way we are not currently in.
if (!_blocks.Any(b => b.Index == iterCopy.Index))
{
GetProcessor(l, iterCopy.Index).SeekBlockEnd(iterCopy);
}
return(false);
}
return(l.Label != null && l.Label.Name.Equals(gotoExp, Services.StringViewComparer));
})) != null)
{
if (currLine.Instruction != null &&
(currLine.Instruction.Name.Contains('=') ||
currLine.Instruction.Name.Equals(".equ", Services.StringComparison) ||
currLine.Instruction.Name.Equals(".global", Services.StringComparison)
)
)
{
Services.Log.LogEntry(line.Instruction,
$"\"{gotoExp}\" is not a valid destination.");
}
else
{
while (_currentBlock != null)
{
// if where we landed lies outside of the current block scope
// we need to pop out of that scope.
_currentBlock.SeekBlockEnd(lines);
if (iterCopy.Index > _currentBlock.Index)
{
// did we land in a place still within the block scope?
if (iterCopy.Index > lines.Index)
{
// no, pop out
DoPop(lines);
}
else
{
// we're still within the current block, don't pop it
break;
}
}
else
{
// we went backwards, pop out of current scope
DoPop(lines);
}
}
if (iterCopy.Index >= lines.Index)
{
lines.FastForward(iterCopy.Index);
}
else if (iterCopy.Index == 0)
{
lines.Reset();
}
else
{
lines.Rewind(iterCopy.Index - 1);
}
}
}
else
{
Services.Log.LogEntry(line.Instruction,
$"Could not find destination \"{gotoExp}\".");
}
}
return(string.Empty);
}
protected override string OnAssemble(RandomAccessIterator <SourceLine> lines)
{
var line = lines.Current;
if (Reserved.IsOneOf("Goto", line.Instruction.Name))
{
return(DoGoto(lines));
}
if (Reserved.IsOneOf("Functional", line.Instruction.Name))
{
if (line.Instruction.Name.Equals(".function", Services.StringComparison))
{
DefineFunction(lines);
}
else if (_currentBlock != null)
{
throw new SyntaxException(line.Instruction.Position,
"Directive \".endfunction\" can only be made inside function block.");
}
return(string.Empty);
}
if (_openClosures.ContainsKey(line.Instruction.Name))
{
var block = GetProcessor(line, lines.Index);
if (_blocks.Count == 0)
{
ScanBlock(lines);
}
_blocks.Push(block);
_currentBlock = block;
}
if (line.Instruction.Name.Equals(".block", Services.StringComparison) && line.Label != null)
{
DefineLabel(line.Label, PCOnAssemble, false);
}
var isBreakCont = Reserved.IsOneOf("BreakContinue", line.Instruction.Name);
if (_currentBlock == null || (!isBreakCont && !_currentBlock.IsReserved(line.Instruction.Name)))
{
throw new SyntaxException(line.Instruction.Position,
$"\"{line.Instruction.Name}\" directive must come inside a block.");
}
if (isBreakCont)
{
if (line.Operands.Count > 0)
{
throw new SyntaxException(line.Operands[0], "Unexpected expression.");
}
var isBreak = line.Instruction.Name.Equals(".break", Services.StringComparison);
if ((!_currentBlock.AllowContinue && line.Instruction.Name.Equals(".continue", Services.StringComparison)) ||
(!_currentBlock.AllowBreak && isBreak))
{
while (_currentBlock != null)
{
var allowBreak = false;
_currentBlock.SeekBlockEnd(lines);
if (isBreak)
{
allowBreak = _currentBlock.AllowBreak;
}
else if (!isBreak && _currentBlock.AllowContinue)
{
break;
}
DoPop(lines);
if (isBreak && allowBreak)
{
return(string.Empty);
}
}
if (_currentBlock == null)
{
var err = isBreak ? "break" : "continue";
throw new SyntaxException(line.Instruction.Position,
$"No enclosing loop out of which to {err}.");
}
}
else if (isBreak)
{
DoPop(lines);
return(string.Empty);
}
else
{
_currentBlock.SeekBlockEnd(lines);
}
}
_currentBlock.ExecuteDirective(lines);
if (lines.Current.Instruction != null && lines.Current.Instruction.Name.Equals(_currentBlock.BlockClosure, Services.StringComparison))
{
DoPop(lines);
}
if (line.Label != null)
{
return($".{Services.Output.LogicalPC,-42:x4}{line.Source.Substring(line.Label.Position - 1, line.Label.Name.Length)}");
}
return(string.Empty);
}
/// <summary>
/// Assemble the collection of parsed <see cref="SourceLine"/> objects. This method must be inherited.
/// </summary>
/// <param name="lines">A <see cref="RandomAccessIterator{T}"/> of source lines.</param>
/// <returns>The disassembly output from the assembly operation.</returns>
/// <exception cref="BlockClosureException"/>
/// <exception cref="DirectoryNotFoundException"/>
/// <exception cref="DivideByZeroException"/>
/// <exception cref="ExpressionException"/>
/// <exception cref="FileNotFoundException"/>
/// <exception cref="FormatException"/>
/// <exception cref="InvalidPCAssignmentException"/>
/// <exception cref="BlockAssemblerException"/>
/// <exception cref="OverflowException"/>
/// <exception cref="ProgramOverflowException"/>
/// <exception cref="ReturnException"/>
/// <exception cref="SectionException"/>
/// <exception cref="SymbolException"/>
/// <exception cref="SyntaxException"/>
protected abstract string OnAssemble(RandomAccessIterator <SourceLine> lines);
public override void ExecuteDirective(RandomAccessIterator <SourceLine> lines)
{
var line = lines.Current;
if (line.Instruction.Name.Equals(".endswitch", Services.StringComparison))
{
return;
}
CaseBlock <string> stringBlock = null;
CaseBlock <double> numericBlock = null;
SwitchContext context = null;
var it = line.Operands.GetIterator();
if (it.MoveNext())
{
if (StringHelper.ExpressionIsAString(it, Services))
{
context = new SwitchContext(StringHelper.GetString(it, Services));
}
else
{
context = new SwitchContext(Services.Evaluator.Evaluate(it, false));
}
if (it.Current != null)
{
throw new SyntaxException(it.Current, "Unexpected expression.");
}
}
if (context == null)
{
string error;
if (line.Operands.Count == 0)
{
error = "Expression must follow \".switch\" directive.";
}
else
{
error = "Expression must be a valid symbol or an expression.";
}
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position, error);
return;
}
var defaultIndex = -1;
if (!string.IsNullOrEmpty(context.StringValue))
{
stringBlock = new CaseBlock <string>();
}
else
{
numericBlock = new CaseBlock <double>();
}
while ((line = lines.GetNext()) != null &&
(line.Instruction == null || !line.Instruction.Name.Equals(".endswitch", Services.StringComparison)))
{
if (line.Instruction != null)
{
if (line.Instruction.Name.Equals(".case", Services.StringComparison))
{
if (defaultIndex > -1)
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position,
"\".case\" directive cannot follow a \".default\" directive.");
}
else if (stringBlock?.FallthroughIndex > -1 || numericBlock?.FallthroughIndex > -1)
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position,
"\".case\" does not fall through.");
}
else if (line.Operands.Count == 0)
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position,
"Expression expected.");
}
else
{
var iterator = line.Operands.GetIterator();
if (stringBlock != null)
{
if (!StringHelper.ExpressionIsAString(iterator, Services))
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Operands[0].Position,
"String expression expected.");
}
else
{
stringBlock.Cases.Add(StringHelper.GetString(iterator, Services));
}
}
else
{
numericBlock?.Cases.Add(Services.Evaluator.Evaluate(iterator));
}
if (iterator.Current != null)
{
throw new SyntaxException(iterator.Current, "Unexpected expression.");
}
}
}
else if (Reserved.IsOneOf("BreakContReturn", line.Instruction.Name))
{
if ((stringBlock?.Cases.Count == 0 || numericBlock?.Cases.Count == 0) &&
defaultIndex < 0)
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position,
$"\"{line.Instruction}\" directive must follow a \".case\" or \".default\" directive.");
}
else
{
if (line.Instruction.Name.Equals(".return", Services.StringComparison) &&
(stringBlock?.FallthroughIndex < 0 || numericBlock?.FallthroughIndex < 0))
{
if (stringBlock != null)
{
stringBlock.FallthroughIndex = lines.Index;
}
if (numericBlock != null)
{
numericBlock.FallthroughIndex = lines.Index;
}
}
else if (!line.Instruction.Name.Equals(".return", Services.StringComparison) && line.Operands.Count > 0)
{
throw new SyntaxException(line.Operands[0], "Unexpected expression.");
}
context.AddBlock(stringBlock);
context.AddBlock(numericBlock);
Services.SymbolManager.PopScope();
if (stringBlock != null)
{
stringBlock = new CaseBlock <string>();
}
else
{
numericBlock = new CaseBlock <double>();
}
}
}
else if (line.Instruction.Name.Equals(".default", Services.StringComparison))
{
if (line.Operands.Count > 0)
{
throw new SyntaxException(line.Operands[0], "Unexpected expression.");
}
if (defaultIndex > -1)
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position,
"There can only be one \".default\" directive in a switch block.");
}
else
{
defaultIndex = lines.Index + 1;
}
}
else if (line.Label != null)
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Label.Position,
"Label cannot be defined inside a switch block.");
}
else
{
if ((stringBlock?.Cases.Count == 0 || numericBlock?.Cases.Count == 0) && defaultIndex < 0)
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position, "\".case\" or \".default\" directive expected");
}
else if (stringBlock?.FallthroughIndex < 0 || numericBlock?.FallthroughIndex < 0)
{
if (stringBlock != null)
{
stringBlock.FallthroughIndex = lines.Index;
}
if (numericBlock != null)
{
numericBlock.FallthroughIndex = lines.Index;
}
}
}
}
}
if (line != null)
{
if (defaultIndex < 0 || !context.AnyCaseDefined())
{
if (defaultIndex >= 0)
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position,
"Only a default case was specified.", false);
}
else if (!context.AnyCaseDefined())
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position,
"Switch statement did not encounter any cases to evaluate.");
return;
}
else
{
Services.Log.LogEntry(line.Filename, line.LineNumber, line.Instruction.Position,
"Switch statement does not have a default case.", false);
}
}
var fallthroughIndex = context.GetFallthroughIndex();
if (fallthroughIndex < 0)
{
fallthroughIndex = defaultIndex;
}
if (fallthroughIndex > -1)
{
lines.Rewind(fallthroughIndex - 1);
}
Services.SymbolManager.PushScope(lines.Index.ToString());
}
}
/// <summary>
/// Construct a new instance of a symbol class.
/// </summary>
/// <param name="tokens">The tokenized expression of the symbol definition.</param>
/// <param name="eval">The <see cref="Evaluator"/> to evaluate the expression.</param>
public Symbol(RandomAccessIterator <Token> tokens, Evaluator eval)
: this(tokens, eval, true)
{
}
/// <summary>
/// Construct a new instance of a symbol class.
/// </summary>
/// <param name="tokens">The tokenized expression of the symbol definition.</param>
/// <param name="eval">The <see cref="Evaluator"/> to evaluate the expression.</param>
/// <param name="isMutable">The symbol's mutability flag.</param>
public Symbol(RandomAccessIterator <Token> tokens, Evaluator eval, bool isMutable)
: this()
{
IsMutable = isMutable;
StorageType = StorageType.Vector;
var opens = 1;
var token = tokens.GetNext();
if (TokenType.End.HasFlag(token.Type))
{
throw new SyntaxException(token.Position, "Expression expected.");
}
if (StringHelper.IsStringLiteral(tokens))
{
DataType = DataType.String;
}
else
{
DataType = DataType.Numeric;
}
int index = 0;
while (opens > 0)
{
if (token.Type == TokenType.Open && token.Name.Equals("["))
{
opens++;
}
else if (token.Name.Equals("]"))
{
opens--;
}
else
{
if (DataType == DataType.String)
{
if (!StringHelper.IsStringLiteral(tokens))
{
throw new SyntaxException(token.Position, "Type mismatch.");
}
StringVector.Add(index++, token.Name.TrimOnce('"'));
token = tokens.GetNext();
if (token.Name.Equals("]"))
{
opens--;
}
}
else
{
NumericVector.Add(index++, eval.Evaluate(tokens, false));
token = tokens.Current;
if (token.Name.Equals("]"))
{
continue;
}
}
}
token = tokens.GetNext();
}
}
double EvaluateSymbol(RandomAccessIterator <Token> tokens)
{
var token = tokens.Current;
var subscript = -1;
var converted = double.NaN;
var isString = token.IsDoubleQuote();
if (char.IsLetter(token.Name[0]) || token.Name[0] == '_')
{
var next = tokens.GetNext();
if (next != null && next.IsOpen() && next.Name.Equals("["))
{
subscript = (int)Evaluator.Evaluate(tokens, 0, int.MaxValue);
}
var symbol = SymbolManager.GetSymbol(token, CurrentPass > 0);
if (symbol == null)
{
if (token.Line.Label != null && token.Line.Label.Name.Equals(token.Name, StringViewComparer))
{
throw new SymbolException(token, SymbolException.ExceptionReason.NotDefined);
}
PassNeeded = true;
return(0x100);
}
if (subscript >= 0)
{
if (symbol.StorageType != StorageType.Vector)
{
throw new SyntaxException(token.Position, "Type mismatch.");
}
if ((symbol.IsNumeric && subscript >= symbol.NumericVector.Count) ||
(!symbol.IsNumeric && subscript >= symbol.StringVector.Count))
{
throw new SyntaxException(token.Position, "Index was out of range.");
}
if (symbol.IsNumeric)
{
return(symbol.NumericVector[subscript]);
}
token = new Token(symbol.StringVector[subscript], TokenType.Operand);
isString = true;
}
else if (symbol.IsNumeric)
{
if (symbol.DataType == DataType.Address && symbol.Bank != Output.CurrentBank)
{
return((int)symbol.NumericValue | (symbol.Bank * 0x10000));
}
return(symbol.NumericValue);
}
else
{
token = new Token(symbol.StringValue, TokenType.Operand);
isString = true;
}
}
if (isString || token.IsQuote())
{
// is it a string literal?
var literal = token.IsQuote() ? token.Name.TrimOnce(token.Name[0]).ToString() : token.Name.ToString();
if (string.IsNullOrEmpty(literal))
{
throw new SyntaxException(token.Position, "Cannot evaluate empty string.");
}
literal = Regex.Unescape(literal);
if (!isString)
{
var charsize = 1;
if (char.IsSurrogate(literal[0]))
{
charsize++;
}
if (literal.Length > charsize)
{
throw new SyntaxException(token.Position, "Invalid char literal.");
}
}
// get the integral equivalent from the code points in the string
converted = Encoding.GetEncodedValue(literal);
}
else if (token.Name.Equals("*"))
{ // get the program counter
converted = Output.LogicalPC;
}
else if (token.Name[0].IsSpecialOperator())
{ // get the special character value
if (token.Name[0] == '+' && CurrentPass == 0)
{
converted = Output.LogicalPC;
PassNeeded = true;
}
else
{
converted = SymbolManager.GetLineReference(token.Name, token);
if (double.IsNaN(converted))
{
var reason = token.Name[0] == '+' ? SymbolException.ExceptionReason.InvalidForwardReference :
SymbolException.ExceptionReason.InvalidBackReference;
throw new SymbolException(token, reason);
}
}
}
if (double.IsNaN(converted))
{
throw new ExpressionException(token.Position,
$"\"{token.Name}\" is not a expression.");
}
return(converted);
}
