public void is_a_string_token()
{
StringTokenizer st = new StringTokenizer("\"\"coucou\"a string\" 1454 toto");
string s;
// we must have ""
Assert.That(st.IsString(out s));
Assert.That(s, Is.EqualTo(""));
// we must have coucou
Assert.That(st.MatchIdentifier("coucou"));
// we must have ""
Assert.That(st.IsString(out s) && s == "a string");
Assert.That(st.IsString(out s), Is.False);
Assert.That(st.IsIdentifier(out s), Is.False);
Assert.That(st.Match(TokenType.OpenCurly), Is.False);
Assert.That(st.MatchIdentifier("b"), Is.False);
int i;
Assert.That(st.IsInteger(out i) && i == 1454);
Assert.That(st.IsString(out s), Is.False);
Assert.That(st.IsInteger(out i), Is.False);
Assert.That(st.Match(TokenType.SemiColon), Is.False);
Assert.That(st.MatchIdentifier("YOYO"), Is.False);
Assert.That(st.MatchIdentifier("toto"));
Assert.That(st.Match(TokenType.EndOfInput));
}
public void simple_tokens()
{
StringTokenizer t = new StringTokenizer("2 + 96");
t.Match(TokenType.None).Should().BeTrue();
t.MatchInteger(out var i).Should().BeTrue(); i.Should().Be(2);
t.Match(TokenType.Plus).Should().BeTrue();
t.MatchInteger(out i).Should().BeTrue(); i.Should().Be(96);
}
Node ParseCondExpression(StringTokenizer t)
{
var condition = ParseExpression(t);
if (t.Match(TokenType.QuestionMark))
{
var then = ParseCondExpression(t);
if (!t.Match(TokenType.Colon))
{
return(new ErrorNode("Expected : of ternary operator."));
}
var @else = ParseCondExpression(t);
condition = new IfNode(condition, then, @else);
}
return(condition);
}
Node ParseFactor(StringTokenizer t)
{
if (t.Match(TokenType.Minus))
{
return(new UnaryNode(TokenType.Minus, ParsePositiveFactor(t)));
}
return(ParsePositiveFactor(t));
}
Node ParsePositiveFactor(StringTokenizer t)
{
if (t.MatchDouble(out var f))
{
return(new ConstantNode(f));
}
if (t.MatchIdentifier(out var id))
{
return(new IdentifierNode(id));
}
if (t.Match(TokenType.OpenPar))
{
Node expr = ParseCondExpression(t);
if (!t.Match(TokenType.ClosePar))
{
return(new ErrorNode("Expected )."));
}
return(expr);
}
return(new ErrorNode("Expected ( or number."));
}