/// <summary>
/// Constructs the parser
/// </summary>
/// <param name="file">The file name to parse</param>
public Parser(string file)
{
lexer = new Lexer(File.ReadAllText(file), this);
Errors = new List<string>();
Warnings = new List<string>();
CurrentScope = Global;
int pos = file.LastIndexOf('.');
string realname = pos >= 0 ? file.Substring(0, pos) : file;
Output.Add(LogType.Parse, File.CreateText(realname + "_parseinfo.txt"));
Output.Add(LogType.SymbolTable, File.CreateText(realname + "_symboltable.txt"));
Output.Add(LogType.Error, System.Console.Error);
Output.Add(LogType.Warning, System.Console.Error);
Output.Add(LogType.Code, File.CreateText(realname + ".m"));
}
/// <summary>
/// Tries to consume a token of the given type
/// </summary>
/// <param name="val">The value of the token, can be null to ignore</param>
/// <param name="type">The type of the token, can be null to ignore</param>
/// <returns>A bool signifying if the symbol could be matched or not</returns>
protected bool Match(int p, string val, Lexer.Token.TokenType? type)
{
bool ok = true;
if (val != null && lookahead.Value != val)
ok = false;
else if (type.HasValue && lookahead.Type != type.Value)
ok = false;
if (!ok && p == 1)
SyntaxError(string.Format("{0}: expected '{1}', got instead '{2}', a {3}",
lookahead.Line, val ?? type.Value.ToString(), lookahead.Value, lookahead.Type.ToString()));
if (lookahead.Type != Lexer.Token.TokenType.EndOfFile)
lookahead = lexer.GetNextToken();
return ok;
}
/// <summary>
/// Tries to match a token from a type
/// </summary>
/// <param name="type">The type of the token to match against</param>
/// <returns></returns>
protected bool Match(int p, Lexer.Token.TokenType type)
{
return Match(p, null, type);
}
