public static int ParseParameter(Command.ParameterType t, PreParsedLine l, out ParsedType foundType, Dictionary <string, Alias> aliases, Dictionary <string, int> labels = null)
{
int x = 0;
foundType = ParsedType.Constant;
switch (t)
{
case Command.ParameterType.Label:
if (labels != null && !labels.TryGetValue(l.Parameter.Value, out x))
{
throw new ArgumentException("Unable to find label '" + l.Parameter + "' of line '" + l.InputLine + "'");
}
foundType = ParsedType.Label;
break;
case Command.ParameterType.Constant:
if (!int.TryParse(l.Parameter.Value, out x))
{
throw new ArgumentException("Unable to parse parameter '" + l.Parameter + "' of line '" + l.InputLine + "'");
}
break;
case Command.ParameterType.StackDelta:
x = ParseNonNegative(l);
foundType = ParsedType.StackDelta;
break;
case Command.ParameterType.StackAddress:
x = ParseNonNegative(l);
foundType = ParsedType.Address;
break;
case Command.ParameterType.Address:
foundType = ParsedType.Address;
if (!int.TryParse(l.Parameter.Value, out x))
{
Alias alias;
if (aliases.TryGetValue(l.Parameter.Value, out alias))
{
x = alias.Address;
foundType = ParsedType.Alias;
}
else
{
throw new ArgumentException("Unable to parse address parameter '" + l.Parameter + "' of line '" + l.InputLine + "'. Parameter is no valid integer, or known alias");
}
}
if (x < 0 || x >= State.MemorySize)
{
throw new ArgumentException("Address parameter '" + l.Parameter + "' of line '" + l.InputLine + "' exceeds valid address range");
}
break;
}
return(x);
}
private static int ParseNonNegative(PreParsedLine l)
{
int x = 0;
if (!int.TryParse(l.Parameter.Value, out x))
{
throw new ArgumentException("Unable to parse parameter '" + l.Parameter + "' of line '" + l.InputLine + "'");
}
if (x < 0)
{
throw new ArgumentException("Parameter '" + l.Parameter + "' of line '" + l.InputLine + "' must not be negative");
}
if (x >= State.MemorySize)
{
throw new ArgumentException("Parameter '" + l.Parameter + "' of line '" + l.InputLine + "' must be less than the address space size " + State.MemorySize);
}
return(x);
}
public static Instruction[] Parse(IEnumerable <string> lines)
{
int lineIndex = 0;
var labels = new Dictionary <string, int>();
var instructions = new List <Instruction>();
lineIndex = 0;
int commandCounter = 0;
Dictionary <string, Alias> aliases = new Dictionary <string, Alias>();
foreach (var line in lines)
{
lineIndex++;
try
{
var l = new PreParsedLine(line);
if (l.Label.HasValue)
{
if (labels.ContainsKey(l.Label.Value))
{
throw new ArgumentException("Label '" + l.Label.Value + "' re-defined. Was originally defined at command #" + labels[l.Label.Value]);
}
labels.Add(l.Label.Value, commandCounter);
}
if (l.IsAlias)
{
var alias = l.ToAlias();
if (aliases.ContainsKey(alias.Name))
{
throw new ArgumentException("Alias '" + alias.Name + "' already defined");
}
aliases.Add(alias.Name, alias);
if (l.IntAliasValue.HasValue)
{
commandCounter++; //set
}
}
if (l.IsCommand)
{
commandCounter++;
}
}
catch (Exception ex)
{
throw new CommandException(ex, line, lineIndex);
}
}
foreach (var alias in aliases.Values)
{
if (alias.InitialValue.HasValue)
{
instructions.Add(new Instruction(s => { s.m[alias.Address] = alias.InitialValue.Value; s.LogM(alias.Address); }, alias.ToString()));
}
}
lineIndex = 0;
foreach (var line in lines)
{
lineIndex++;
var l = new PreParsedLine(line);
if (!l.IsCommand)
{
continue;
}
Action <State> action = null;
string lineText = "";
Language.Command command;
try
{
command = Language.FindCommand(l.Command.Value, l.Parameter != null);
}
catch (Exception ex)
{
throw new CommandException(ex, line, lineIndex);
}
if (l.Label != null)
{
lineText = l.Label + "(=" + instructions.Count + "): ";
}
else
{
lineText = "(" + instructions.Count + "): ";
}
if (command.RequiresParameter)
{
ParsedType ignore;
int x = ParseParameter(command.Parameter, l, out ignore, aliases, labels);
action = (s) => command.Action(s, x);
lineText += command.Name + " " +
"" + l.Parameter;
}
else
{
action = (s) => command.Action(s, 0);
lineText += command.Name;
}
instructions.Add(new Instruction(action, lineText));
}
return(instructions.ToArray());
}