private bool TryDeclaration(out Statement statement)
{
statement = default;
try
{
if (AdvanceIfMatches(out var consumed, TokenType.Fun))
{
statement = FunctionDeclaration();
}
else if (AdvanceIfMatches(out consumed, TokenType.Var))
{
statement = VariableDeclaration();
}
else
{
statement = Statement();
}
return(true);
}
catch (SynchronizeSignal s)
{
Synchronize();
Console.Error.WriteLine(s.Message);
return(false);
}
}
private Statement IfStatement()
{
AdvanceIfMatchesOrCrashIfNotMatches(TokenType.LeftParenthesis, "Expected '(' after 'if'.", out _);
var condition = Expression();
AdvanceIfMatchesOrCrashIfNotMatches(TokenType.RightParenthesis, "Expected ')' after 'if'.", out _);
var thenBranch = Statement();
Statement elseBranch = default;
if (AdvanceIfMatches(out _, TokenType.Oppure))
{
elseBranch = Statement();
}
return(new Statements.If(condition, thenBranch, elseBranch));
}
