void ReturnsEof_WhenWhitespace()
{
//act
var tokens = Lexer.AnalyseExpression(" ");
//assert
Assert.Single(tokens, t => t is EofToken);
}
void AnalysesParensWithoutWhitespace(string expression)
{
//act
var tokens = Lexer.AnalyseExpression(expression).ToList();
//assert
Assert.IsType <OrElseToken>(tokens[0]);
Assert.IsType <LeftParenToken>(tokens[1]);
Assert.IsType <AndAlsoToken>(tokens[2]);
Assert.IsType <RightParenToken>(tokens[3]);
Assert.IsType <OrElseToken>(tokens[4]);
}
void ReturnsTokens_WhenMatchingEverything(string expression)
{
//act
var tokens = Lexer.AnalyseExpression(expression).ToList();
//assert
Assert.IsType <AndAlsoToken>(tokens[0]);
Assert.IsType <ArgsToken>(tokens[1]);
Assert.IsType <LeftParenToken>(tokens[2]);
Assert.IsType <NotToken>(tokens[3]);
Assert.IsType <OrElseToken>(tokens[4]);
Assert.IsType <RightParenToken>(tokens[5]);
Assert.IsType <StringToken>(tokens[6]);
Assert.IsType <SymbolToken>(tokens[7]);
Assert.IsType <WithinToken>(tokens[8]);
Assert.IsType <EofToken>(tokens[9]);
}
void Throws_WhenNotMatchingEverything(string expression)
{
//assert
Assert.Throws <WeavingException>(() => Lexer.AnalyseExpression(expression).ToList());
}
