author Emilio Cobos Álvarez <>
Sat, 08 Aug 2020 16:21:35 +0000
changeset 544015 b579c12907dc3bb210177454a696ccc181c1ded0
parent 492166 82659174fa8324ac3c0ca20727d1370cd3d0bf42
permissions -rw-r--r--
Bug 1657437 - Don't treat lone CRs as segment breaks. r=jfkthame That prevents preceding whitespace from getting collapsed. When there's a single lone CR (so `a\rb`) our behavior here diverges from Chrome's but matches Safari's. We treat it as ZWSP. That matches the initial resolution of [1], but then there have been various doing and undoings of that resolution, so it's not totally clear to me what the correct behavior per spec should be. I think "treat it as other control character"? But I haven't dug into what that implies, so for now I've just kept behavior there as-is. [1]: Differential Revision:

/* 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 */

#include "nsISupports.idl"

interface nsIAsyncOutputStream;
interface nsIInputStream;

namespace mozilla {
namespace net {
class PreferredAlternativeDataTypeParams;
} // namespace mozilla

[ref] native ConstPreferredAlternativeDataTypeArray(const nsTArray<mozilla::net::PreferredAlternativeDataTypeParams>);

[scriptable, uuid(1fb8ccf2-5fa5-45ec-bc57-8c8022a5d0d3)]
interface nsIInputStreamReceiver : nsISupports
  void onInputStreamReady(in nsIInputStream aStream);

[scriptable, builtinclass, uuid(72c34415-c6eb-48af-851f-772fa9ee5972)]
interface nsICacheInfoChannel : nsISupports
   * Get the number of times the cache entry has been opened. This attribute is
   * equivalent to nsICachingChannel.cacheToken.fetchCount.
   * @throws NS_ERROR_NOT_AVAILABLE if the cache entry or the alternate data
   *         cache entry cannot be read.
  readonly attribute int32_t cacheTokenFetchCount;

   * Get expiration time from cache token. This attribute is equivalent to
   * nsICachingChannel.cacheToken.expirationTime.
  readonly attribute uint32_t cacheTokenExpirationTime;

   * Set/get charset of cache entry. Accessing this attribute is equivalent to
   * calling nsICachingChannel.cacheToken.getMetaDataElement("charset") and
   * nsICachingChannel.cacheToken.setMetaDataElement("charset").
  attribute ACString cacheTokenCachedCharset;

   * TRUE if this channel's data is being loaded from the cache.  This value
   * is undefined before the channel fires its OnStartRequest notification
   * and after the channel fires its OnStopRequest notification.
  boolean isFromCache();

   * Returns true if the channel raced the cache and network requests.
   * In order to determine if the response is coming from the cache or the
   * network, the consumer can check isFromCache().
   * The method can only be called after the channel fires its OnStartRequest
   * notification.
  boolean isRacing();

   * The unique ID of the corresponding nsICacheEntry from which the response is
   * retrieved. By comparing the returned value, we can judge whether the data
   * of two distinct nsICacheInfoChannels is from the same nsICacheEntry. This
   * scenario could be useful when verifying whether the alternative data from
   * one nsICacheInfochannel matches the main data from another one.
   * Note: NS_ERROR_NOT_AVAILABLE is thrown when a nsICacheInfoChannel has no
   * valid corresponding nsICacheEntry.
  uint64_t getCacheEntryId();

   * Set/get the cache key. This integer uniquely identifies the data in
   * the cache for this channel.
   * A cache key retrieved from a particular instance of nsICacheInfoChannel
   * could be set on another instance of nsICacheInfoChannel provided the
   * underlying implementations are compatible and provided the new
   * channel instance was created with the same URI.  The implementation of
   * nsICacheInfoChannel would be expected to use the cache entry identified
   * by the cache token.  Depending on the value of nsIRequest::loadFlags,
   * the cache entry may be validated, overwritten, or simply read.
   * The cache key may be 0 indicating that the URI of the channel is
   * sufficient to locate the same cache entry.  Setting a 0 cache key
   * is likewise valid.
  attribute unsigned long cacheKey;

   * Tells the channel to behave as if the LOAD_FROM_CACHE flag has been set,
   * but without affecting the loads for the entire loadGroup in case of this
   * channel being the default load group's channel.
  attribute boolean allowStaleCacheContent;

   * Tells the priority for LOAD_CACHE is raised over LOAD_BYPASS_CACHE or
   * LOAD_BYPASS_LOCAL_CACHE in case those flags are set at the same time.
  attribute boolean preferCacheLoadOverBypass;

   * Calling this method instructs the channel to serve the alternative data
   * if that was previously saved in the cache, otherwise it will serve the
   * real data.
   * @param type
   *        a string identifying the alt-data format
   * @param contentType
   *        the contentType for which the preference applies.
   *        an empty contentType means the preference applies for ANY contentType
   * @param deliverAltData
   *        if false, also if alt-data is available, the channel will deliver
   *        the original data.
   * The method may be called several times, with different type and contentType.
   * Must be called before AsyncOpen.
  void preferAlternativeDataType(in ACString type, in ACString contentType,
                                 in boolean deliverAltData);

   * Get the preferred alternative data type set by preferAlternativeDataType().
   * The returned types stand for the desired data type instead of the type of the
   * information retrieved from the network stack.
  [noscript, notxpcom, nostdcall]
  ConstPreferredAlternativeDataTypeArray preferredAlternativeDataTypes();

   * Holds the type of the alternative data representation that the channel
   * is returning.
   * Is empty string if no alternative data representation was requested, or
   * if the requested representation wasn't found in the cache.
   * Can only be called during or after OnStartRequest.
  readonly attribute ACString alternativeDataType;

   * If preferAlternativeDataType() has been called passing deliverAltData
   * equal to false, this method will expose the alt-data inputStream if
   * aviable.
  void getAltDataInputStream(in ACString type,
                             in nsIInputStreamReceiver aReceiver);

   * Sometimes when the channel is delivering alt-data, we may want to somehow
   * access the original content too. This method asynchronously opens the
   * input stream and delivers it to the receiver.
  void getOriginalInputStream(in nsIInputStreamReceiver aReceiver);

   * Opens and returns an output stream that a consumer may use to save an
   * alternate representation of the data.
   * Must be called after the OnStopRequest that delivered the real data.
   * The consumer may choose to replace the saved alt representation.
   * Opening the output stream will fail if there are any open input streams
   * reading the already saved alt representation. After successfully opening
   * an output stream, if there is an error before the entire alt data can be
   * written successfully, the client must signal failure by passing an error
   * code to CloseWithStatus().
   * @param type
   *        type of the alternative data representation
   * @param predictedSize
   *        Predicted size of the data that will be written. It's used to decide
   *        whether the resulting entry would exceed size limit, in which case
   *        an error is thrown. If the size isn't known in advance, -1 should be
   *        passed.
  nsIAsyncOutputStream openAlternativeOutputStream(in ACString type, in long long predictedSize);