public void Should_lex_expression_with_nested_parentheses()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("((10 + 1 - (3 - .234)) * 300) / 10.1"));
// Then
scanner.NextToken().Type.Should().Be(TokenType.LeftParenthesis);
scanner.NextToken().Type.Should().Be(TokenType.LeftParenthesis);
((LiteralToken) scanner.NextToken()).Value.Should().Be(10D);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(1D);
scanner.NextToken().Type.Should().Be(TokenType.Minus);
scanner.NextToken().Type.Should().Be(TokenType.LeftParenthesis);
((LiteralToken)scanner.NextToken()).Value.Should().Be(3D);
scanner.NextToken().Type.Should().Be(TokenType.Minus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(.234D);
scanner.NextToken().Type.Should().Be(TokenType.RightParenthesis);
scanner.NextToken().Type.Should().Be(TokenType.RightParenthesis);
scanner.NextToken().Type.Should().Be(TokenType.Multiply);
((LiteralToken)scanner.NextToken()).Value.Should().Be(300D);
scanner.NextToken().Type.Should().Be(TokenType.RightParenthesis);
scanner.NextToken().Type.Should().Be(TokenType.Divide);
((LiteralToken)scanner.NextToken()).Value.Should().Be(10.1D);
scanner.NextToken().Should().BeNull();
}
/// <summary>
/// Convenience method for building an AST from a string, used internally.
/// </summary>
public static SyntaxTree ParseString(string value)
{
using (var scanner = new Lexer(Tokenizer.OfString(value)))
{
return new Parser(scanner).Parse();
}
}
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_number_with_lower_case_exponent_and_minus_sign()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("10E-11 + 10e-11"));
// Than
((LiteralToken) scanner.NextToken()).Value.Should().Be(0.0000000001D);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(0.0000000001D);
}
public void Should_lex_number_with_lower_case_exponent()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("10e2 + 4"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(1000D);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(4D);
}
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_negative_and_positive_decimal_number_with_zero_omitted_and_explicit_sign()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString(".2 / +9.99 * (-.123 + -2)"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(.2D);
scanner.NextToken().Type.Should().Be(TokenType.Divide);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(9.99D);
scanner.NextToken().Type.Should().Be(TokenType.Multiply);
scanner.NextToken().Type.Should().Be(TokenType.LeftParenthesis);
scanner.NextToken().Type.Should().Be(TokenType.Minus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(.123D);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
scanner.NextToken().Type.Should().Be(TokenType.Minus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(2D);
scanner.NextToken().Type.Should().Be(TokenType.RightParenthesis);
}
public void Should_lex_number_with_exponent_and_plus_sign()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("1 + 10E+2"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(1D);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(1000D);
}
public void Should_lex_string_literal_with_escape_characters()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString(@"0 + ""\t \n \\ \r"" + 0"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(0D);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be("\t \n \\ \r");
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(0D);
}
public void Should_lex_string_literal_with_double_quote_escape_character()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString(@" ""a\""bc"" "));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be("a\"bc");
}
public void Should_lex_less_than_or_equal_operator()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString(".3 <= .9"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(0.3D);
scanner.NextToken().Type.Should().Be(TokenType.LessThanOrEqual);
((LiteralToken)scanner.NextToken()).Value.Should().Be(0.9D);
}
public void Should_lex_greater_than_operator()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("10 > (10 * 2.2)"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(10D);
scanner.NextToken().Type.Should().Be(TokenType.GreaterThan);
scanner.NextToken().Type.Should().Be(TokenType.LeftParenthesis);
((LiteralToken)scanner.NextToken()).Value.Should().Be(10D);
scanner.NextToken().Type.Should().Be(TokenType.Multiply);
((LiteralToken)scanner.NextToken()).Value.Should().Be(2.2D);
scanner.NextToken().Type.Should().Be(TokenType.RightParenthesis);
}
public void Should_lex_equality_operator()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("var1 == 10.3"));
// Than
((IdentifierToken)scanner.NextToken()).Text.Should().Be("var1");
scanner.NextToken().Type.Should().Be(TokenType.Equality);
((LiteralToken)scanner.NextToken()).Value.Should().Be(10.3D);
}
public void Should_lex_inequality_operator()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString(".3 != 0.003003"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(0.3D);
scanner.NextToken().Type.Should().Be(TokenType.Inequality);
((LiteralToken)scanner.NextToken()).Value.Should().Be(0.003003D);
}
public void Should_lex_identifier_with_underscore()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("var_name"));
// Than
((IdentifierToken)scanner.NextToken()).Text.Should().Be("var_name");
}
public void Should_lex_expression_with_function()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("3 + pow(10, 2)"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(3D);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((IdentifierToken)scanner.NextToken()).Text.Should().Be("pow");
scanner.NextToken().Type.Should().Be(TokenType.LeftParenthesis);
((LiteralToken)scanner.NextToken()).Value.Should().Be(10D);
scanner.NextToken().Type.Should().Be(TokenType.Comma);
((LiteralToken)scanner.NextToken()).Value.Should().Be(2D);
scanner.NextToken().Type.Should().Be(TokenType.RightParenthesis);
}
public void Should_lex_expression_with_sum_near_unary_operators()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("-.23 + +.99 * ((-.123 + -2.1)--333)"));
// Than
scanner.NextToken().Type.Should().Be(TokenType.Minus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(.23D);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(.99D);
scanner.NextToken().Type.Should().Be(TokenType.Multiply);
scanner.NextToken().Type.Should().Be(TokenType.LeftParenthesis);
scanner.NextToken().Type.Should().Be(TokenType.LeftParenthesis);
scanner.NextToken().Type.Should().Be(TokenType.Minus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(.123D);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
scanner.NextToken().Type.Should().Be(TokenType.Minus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(2.1D);
scanner.NextToken().Type.Should().Be(TokenType.RightParenthesis);
scanner.NextToken().Type.Should().Be(TokenType.Minus); ;
scanner.NextToken().Type.Should().Be(TokenType.Minus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(333D);
scanner.NextToken().Type.Should().Be(TokenType.RightParenthesis);
}
public void Should_lex_string_literal()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("\"hello, csharp\""));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be("hello, csharp");
}
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_containing_string_literal()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString(".3 + \"hello, fsharp\" + 0.999"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(0.3D);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be("hello, fsharp");
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(0.999D);
}
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);
}
public void Should_lex_string_literal_with_decimal_escape()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString(@" ""\048\048\055"" "));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be("007");
}
public void Should_lex_false_literal()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("false != .01"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(false);
scanner.NextToken().Type.Should().Be(TokenType.Inequality);
((LiteralToken)scanner.NextToken()).Value.Should().Be(0.01D);
}
public void Should_lex_greater_than_or_equal_operator()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("0.1 >= +5.9"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(0.1D);
scanner.NextToken().Type.Should().Be(TokenType.GreaterThanOrEqual);
scanner.NextToken().Type.Should().Be(TokenType.Plus);
((LiteralToken)scanner.NextToken()).Value.Should().Be(5.9D);
}
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_true_literal()
{
// Given when
var scanner = new Lexer(Tokenizer.OfString("true == 1"));
// Than
((LiteralToken)scanner.NextToken()).Value.Should().Be(true);
scanner.NextToken().Type.Should().Be(TokenType.Equality);
((LiteralToken)scanner.NextToken()).Value.Should().Be(1D);
}
public Parser(Lexer scanner)
{
_scanner = scanner;
}
