public void ShouldConvertToGrammarString()
{
var expr = new OrderedChoice(
new LiteralTerminal("a"),
new LiteralTerminal("b"));
// Create a parser to ensure the expression is compiled
new Parser<Token>((token, ctx, args) => token, new ParseRule("A", expr));
Assert.Equal("('a' || 'b')", expr.ToString());
}
public void ShouldNotAllowZeroSubExpressions()
{
var expr = new OrderedChoice();
try {
new Parser<Token>((token, ctx, args) => token, new ParseRule("A", expr));
Assert.True(false, "Expression without subexpressions was allowed but should have been rejected");
}
catch (EmptyCompositeException e) {
Assert.Equal(expr, e.Expression);
}
}