public static bool TryParse(string[] tokens, out ImportDirective id)
{
if (tokens.Length < 1 || tokens[0].Length == 0)
{
id = null;
return(false);
}
if (tokens[0] == "@import")
{
if (tokens.Length < 2)
{
Console.Error.WriteLine("Expected symbol name after @import");
id = null;
return(false);
}
if (tokens.Length > 2)
{
Console.Error.WriteLine("Too many tokens after @import");
id = null;
return(false);
}
var ret = new ImportDirective();
ret.Label = tokens[1];
id = ret;
return(true);
}
id = null;
return(false);
}
private static bool TryParseWithoutLabel(string[] tokens, out Line result)
{
// Attempt to parse as instruction.
Instruction inst;
if (Instruction.TryParse(tokens, out inst))
{
result = inst;
return(true);
}
// Attempt to parse as directive.
AssemblerDirective dir;
if (AssemblerDirective.TryParse(tokens, out dir))
{
result = dir;
return(true);
}
// Attempt to parse as @import.
ImportDirective id;
if (ImportDirective.TryParse(tokens, out id))
{
result = id;
return(true);
}
// Attempt to parse as @export.
ExportDirective ed;
if (ExportDirective.TryParse(tokens, out ed))
{
result = ed;
return(true);
}
result = null;
return(false);
}