public void TokensAreExtracted()
{
//Arrange
var testStrings = new [] {
"100",
"100+",
"100 ",
"100L",
"+-*/",
"()",
"",
null,
"(3 *5)+ 49"
};
var output = new Output();
//Act
foreach (var testString in testStrings)
{
var result = LexicalAnalyser.ExtractTokens(testString);
output.WrapLine($@"Analysis of ""{testString ?? "NULL"}"":");
output.FormatTable(result.AsReport(rep => rep
.AddColumn(r => r.TokenType, cc => cc.LeftAlign())
.AddColumn(r => r.Text, cc => {}))
);
output.WriteLine();
output.WriteLine();
}
//Assert
output.Report.Verify();
}
public static ArithmeticExpression Parse(string input)
{
var tokens = LexicalAnalyser.ExtractTokens(input ?? string.Empty);
var pos = new TokenKeeper(tokens);
if (TryTakeCalc(pos, out var calculation) && pos.Finished)
{
return(new ArithmeticExpression(calculation));
}
else
{
var errorMessage = $"Unable to interpret calculation at \"{pos.RemainingData()}\"";
return(new ArithmeticExpression(errorMessage));
}
}
public TestTokenKeeper()
{
_tokens = LexicalAnalyser.ExtractTokens(TestExpression).ToList();
_keeper = new TokenKeeper(_tokens);
}
