[Webkit-unassigned] [Bug 21257] New: JS bindings should throw when too few arguments are passed

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Sep 30 15:49:24 PDT 2008


           Summary: JS bindings should throw when too few arguments are
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptGlue
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aa at chromium.org

The JS bindings in WebKit generally do not throw when too few arguments are
passed. For example "document.createElement()" throws in IE and Firefox because
it is spec'd to take one argument, but not in WebKit.

Throwing for invalid function calls is important to developers because it
allows them to catch problems in their code as early as possible. In the case
of document.createElement(), it means that they will clearly see the error
'createElement expects 1 argument', instead of some confusing error later in
their code where they tried to use the undefined return value of createElement.

We can easily make this change all at once for all generated bindings. However,
a concern with this is that there may be special cases where other browsers do
not follow the spec and allow fewer arguments. This would be a problem for
compat. We can probably generate code to find these cases using the IDL.

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