public void GetCarriageReturnNewLineAsEndOfLine()
{
Lexer lexer = new Lexer("\r\n");
Token token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual(TokenType.EndOfLine, token.Type);
Assert.IsNull(lexer.NextToken());
}
static void Main(string[] args)
{
Lexer lexer = new Lexer(System.Console.In);
Context context = new Context();
context.SetValue("puts", new Puts(System.Console.Out));
Parser parser = new Parser(lexer);
for (ICommand cmd = parser.ParseCommand(); cmd != null; cmd = parser.ParseCommand())
cmd.Execute(context);
}
public void GetInteger()
{
Lexer lexer = new Lexer("123");
Token token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual("123", token.Value);
Assert.AreEqual(TokenType.Integer, token.Type);
Assert.IsNull(lexer.NextToken());
}
public void GetEqualOperator()
{
Lexer lexer = new Lexer("==");
Token token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual("==", token.Value);
Assert.AreEqual(TokenType.Operator, token.Type);
Assert.IsNull(lexer.NextToken());
}
public void GetEndOfCommand()
{
Lexer lexer = new Lexer(";");
Token token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual(";", token.Value);
Assert.AreEqual(TokenType.Separator, token.Type);
Assert.IsNull(lexer.NextToken());
}
public void GetName()
{
Lexer lexer = new Lexer("foo");
Token token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual("foo", token.Value);
Assert.AreEqual(TokenType.Name, token.Type);
Assert.IsNull(lexer.NextToken());
}
public void GetSimpleString()
{
Lexer lexer = new Lexer("\"foo\"");
Token token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual("foo", token.Value);
Assert.AreEqual(TokenType.String, token.Type);
Assert.IsNull(lexer.NextToken());
}
public void GetSimpleAssignmentCommand()
{
Lexer lexer = new Lexer("a=123");
Token token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual("a", token.Value);
Assert.AreEqual(TokenType.Name, token.Type);
token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual("=", token.Value);
Assert.AreEqual(TokenType.Operator, token.Type);
token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual("123", token.Value);
Assert.AreEqual(TokenType.Integer, token.Type);
Assert.IsNull(lexer.NextToken());
}
public void GetParentheses()
{
Lexer lexer = new Lexer("()");
Token token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual("(", token.Value);
Assert.AreEqual(TokenType.Separator, token.Type);
token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual(")", token.Value);
Assert.AreEqual(TokenType.Separator, token.Type);
Assert.IsNull(lexer.NextToken());
}
public Parser(Lexer lexer)
{
this.lexer = lexer;
}