/// <summary>
/// Throws an error if the current token does not match the given expression.
/// </summary>
/// <param name="expression">The expression to check.</param>
public void Expect(string expression)
{
var match = CurrentToken.Equals(expression, StringComparison.OrdinalIgnoreCase);
if (!match)
{
throw new ParserException($"'{expression}' expected but found '{CurrentToken}'", CurrentLineNumber);
}
Move();
}
/// <summary>
/// Throws an error if the current token does not match any of the given expressions.
/// </summary>
/// <param name="expression">The expressions to check.</param>
/// <returns>When this method returns, contains the index of the matching expression.</returns>
public int ExpectAny(params string[] expressions)
{
for (int i = 0; i < expressions.Length; i++)
{
var expression = expressions[i];
var match = CurrentToken.Equals(expression, StringComparison.OrdinalIgnoreCase);
if (match)
{
Move();
return(i);
}
}
var expressionsStr = string.Join(", ", expressions.Select(o => $"'{o}'"));
throw new ParserException($"'{expressionsStr}' expected but found '{CurrentToken}'", CurrentLineNumber);
}
