public void Grammar_WithoutStartRule_ThrowsExceptionOnStart()
{
var grammar = new AdHocGrammar();
grammar.TerminalType("A", "start");
grammar.Invoking(g => g.Start()).Should().Throw <GrammarException>().Where(e => e.Id == GrammarExceptionId.StartRuleNotDefined);
}
private static IGrammar <CstNode> SimpleGrammar()
{
var grammar = new AdHocGrammar();
// main := A choose R{2,5} .
// choose := U | V
grammar.Sequence("main",
grammar.TerminalType("A"),
grammar.Choice("choose",
grammar.TerminalValue("U"),
grammar.TerminalValue("V")
),
grammar.Repeat(null, grammar.TerminalType("R"), 2, 5),
grammar.Any(null)
);
grammar.StartWith("main");
return(grammar);
}
public void Grammar_WithStartRule_ReturnsStartRefOnStart()
{
var grammar = new AdHocGrammar();
grammar.TerminalType("A", "start");
grammar.StartWith("start");
var ruleRef = grammar.Start();
ruleRef.Should().NotBeNull();
ruleRef.RefName.Should().Be("start");
ruleRef.Name.Should().Be("start");
}