static void Main(string[] args)
{
while (true)
{
Console.Write("> ");
var line = Console.ReadLine();
if (string.IsNullOrWhiteSpace(line))
{
return;
}
var parser = new Parser(line);
var syntaxTree = parser.Parse();
var color = Console.ForegroundColor;
PrettyPrint(syntaxTree.Root);
if (!parser.Diagnostics.Any())
{
var e = new Evaluator(syntaxTree.Root);
float result = e.Evaluate();
Console.WriteLine(result);
}
else
{
Console.ForegroundColor = ConsoleColor.Red;
foreach (var diagnostic in parser.Diagnostics)
{
Console.Write(diagnostic);
}
Console.ForegroundColor = color;
}
var lexer = new Lexer(line);
while (true)
{
var token = lexer.NextToken();
if (token.Kind == SyntaxKind.EndOfFileToken)
{
break;
}
Console.Write($"{token.Kind}: '{token.Text}' ");
if (token.Value != null)
{
Console.WriteLine($" {token.Value}");
}
Console.WriteLine();
}
}
}
public Parser(string text)
{
var tokens = new List <SyntaxToken>();
var lexer = new Lexer(text);
SyntaxToken token;
do
{
token = lexer.NextToken();
if (token.Kind != SyntaxKind.WhitespaceToken &&
token.Kind != SyntaxKind.BadToken)
{
tokens.Add(token);
}
} while(token.Kind != SyntaxKind.EndOfFileToken);
_tokens = tokens.ToArray();
_diagnostics.AddRange(lexer.Diagnostics);
}
private static void Match(string expected, string source, bool removeSpaces = true)
{
var actual = new StringBuilder();
var lexer = new Lexer(source);
var token = lexer.NextToken();
while (token.Type != TokenType.Eof)
{
switch (token.Type)
{
case TokenType.Number:
actual.Append("n$").Append(token.Text);
break;
case TokenType.String:
actual.Append("'").Append(token.Text).Append("'");
break;
case TokenType.Identifier:
actual.Append("i$").Append(token.Text);
break;
case TokenType.Dot:
actual.Append("d$").Append(token.Text);
break;
default:
if (token.Type.IsKeyword())
actual.Append("k$").Append(token.Text);
else
actual.Append(token.Text);
break;
}
token = lexer.NextToken();
}
actual.Append(token.Text);
if (removeSpaces)
expected = expected.Replace(Environment.NewLine, string.Empty).Replace(" ", string.Empty);
Assert.AreEqual(expected, actual.ToString());
}
