public void Should_not_move_forward_when_using_peek()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("1 + 3"));
// Then
((LiteralToken)scanner.PeekToken()).Value.Should().Be(1D);
((LiteralToken)scanner.NextToken()).Value.Should().Be(1D);
// Then
scanner.PeekToken().Type.Should().Be(TokenType.Plus);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
// Then
((LiteralToken)scanner.PeekToken()).Value.Should().Be(3D);
((LiteralToken)scanner.NextToken()).Value.Should().Be(3D);
// Then
scanner.PeekToken().Should().BeNull();
scanner.NextToken().Should().BeNull();
}
public void Should_lex_expression_with_modulo()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("10 % 2"));
((LiteralToken)scanner.PeekToken()).Value.Should().Be(10D);
((LiteralToken)scanner.NextToken()).Value.Should().Be(10D);
// Then
scanner.PeekToken().Type.Should().Be(TokenType.Modulo);
scanner.NextToken().Type.Should().Be(TokenType.Modulo);
}
public void Should_lex_expression_formed_by_a_single_positive_number_with_plus_sign_explicit()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("+123"));
// Then
scanner.PeekToken().Type.Should().Be(TokenType.Plus);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.PeekToken()).Value.Should().Be(123D);
((LiteralToken)scanner.NextToken()).Value.Should().Be(123D);
}
public void Should_lex_expression_formed_by_a_single_negative__decimal_number_with_zero_omitted()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("-.123"));
// Than
scanner.PeekToken().Type.Should().Be(TokenType.Minus);
scanner.NextToken().Type.Should().Be(TokenType.Minus);
((LiteralToken)scanner.PeekToken()).Value.Should().Be(.123D);
((LiteralToken)scanner.NextToken()).Value.Should().Be(.123D);
}
public void Should_lex_expression_formed_by_a_single_number()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("123"));
// Then
((LiteralToken)scanner.PeekToken()).Value.Should().Be(123D);
((LiteralToken)scanner.NextToken()).Value.Should().Be(123D);
}