public void Evaluate_InvalidExpressionThrows(string expression)
{
var tokens = PermissionExpressionParser.Tokenize(expression);
var rpn = PermissionExpressionParser.ShuntingYard(tokens);
Assert.Throws <InvalidOperationException>(() =>
{
PermissionExpressionParser.Evaluate(rpn, HasPermission);
});
}
public void Evaluate_Expressions(string expression, bool expected)
{
var tokens = PermissionExpressionParser.Tokenize(expression);
var rpn = PermissionExpressionParser.ShuntingYard(tokens);
var actual = PermissionExpressionParser.Evaluate(rpn, HasPermission);
if (expected)
{
Assert.True(actual);
}
else
{
Assert.False(actual);
}
}
/// <summary>
/// Returns true if user has specified permission
/// </summary>
/// <param name="permission">Permission to check</param>
/// <returns>True if user has specified permission</returns>
public bool HasPermission(string permission)
{
if (string.IsNullOrEmpty(permission) ||
permission.IndexOfAny(chars) < 0)
{
return(permissionService.HasPermission(permission));
}
string[] rpnTokens;
if (!cache.TryGetValue(permission, out rpnTokens))
{
var tokens = PermissionExpressionParser.Tokenize(permission);
cache[permission] = rpnTokens = PermissionExpressionParser.ShuntingYard(tokens).ToArray();
}
return(PermissionExpressionParser.Evaluate(rpnTokens, permissionService.HasPermission));
}