зеркало из https://github.com/mozilla/gecko-dev.git
77 строки
2.1 KiB
C++
77 строки
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef nsForwardReference_h__
|
|
#define nsForwardReference_h__
|
|
|
|
class nsForwardReference
|
|
{
|
|
protected:
|
|
nsForwardReference() {}
|
|
|
|
public:
|
|
virtual ~nsForwardReference() {}
|
|
|
|
/**
|
|
* Priority codes returned from GetPhase()
|
|
*/
|
|
enum Phase {
|
|
/** A dummy marker, used to indicate unstarted resolution */
|
|
eStart,
|
|
|
|
/** The initial pass, after which the content model will be
|
|
fully built */
|
|
eConstruction,
|
|
|
|
/** A second pass, after which all 'magic attribute' hookup
|
|
will have been performed */
|
|
eHookup,
|
|
|
|
/** A dummy marker, used in kPasses to indicate termination */
|
|
eDone
|
|
};
|
|
|
|
/**
|
|
* Forward references are categorized by 'priority', and all
|
|
* forward references in a higher priority are resolved before any
|
|
* reference in a lower priority. This variable specifies this
|
|
* ordering. The last Priority is guaranteed to be eDone.
|
|
*/
|
|
static const Phase kPasses[];
|
|
|
|
/**
|
|
* Get the state in which the forward reference should be resolved.
|
|
* 'eConstruction' references are all resolved before 'eHookup' references
|
|
* are resolved.
|
|
*
|
|
* @return the Phase in which the reference needs to be resolved
|
|
*/
|
|
virtual Phase GetPhase() = 0;
|
|
|
|
/**
|
|
* Result codes returned from Resolve()
|
|
*/
|
|
enum Result {
|
|
/** Resolution succeeded, I'm done. */
|
|
eResolve_Succeeded,
|
|
|
|
/** Couldn't resolve, but try me later. */
|
|
eResolve_Later,
|
|
|
|
/** Something bad happened, don't try again. */
|
|
eResolve_Error
|
|
};
|
|
|
|
/**
|
|
* Attempt to resolve the forward reference.
|
|
*
|
|
* @return a Result that tells the resolver how to treat
|
|
* the reference.
|
|
*/
|
|
virtual Result Resolve() = 0;
|
|
};
|
|
|
|
#endif // nsForwardReference_h__
|