gecko-dev/parser/html/nsHtml5SpeculativeLoad.h

136 lines
5.2 KiB
C++

/* 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 nsHtml5SpeculativeLoad_h_
#define nsHtml5SpeculativeLoad_h_
#include "nsString.h"
class nsHtml5TreeOpExecutor;
enum eHtml5SpeculativeLoad {
#ifdef DEBUG
eSpeculativeLoadUninitialized,
#endif
eSpeculativeLoadBase,
eSpeculativeLoadImage,
eSpeculativeLoadScript,
eSpeculativeLoadScriptFromHead,
eSpeculativeLoadStyle,
eSpeculativeLoadManifest,
eSpeculativeLoadSetDocumentCharset
};
class nsHtml5SpeculativeLoad {
public:
nsHtml5SpeculativeLoad();
~nsHtml5SpeculativeLoad();
inline void InitBase(const nsAString& aUrl) {
NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
"Trying to reinitialize a speculative load!");
mOpCode = eSpeculativeLoadBase;
mUrl.Assign(aUrl);
}
inline void InitImage(const nsAString& aUrl,
const nsAString& aCrossOrigin) {
NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
"Trying to reinitialize a speculative load!");
mOpCode = eSpeculativeLoadImage;
mUrl.Assign(aUrl);
mCrossOrigin.Assign(aCrossOrigin);
}
inline void InitScript(const nsAString& aUrl,
const nsAString& aCharset,
const nsAString& aType,
const nsAString& aCrossOrigin,
bool aParserInHead) {
NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
"Trying to reinitialize a speculative load!");
mOpCode = aParserInHead ?
eSpeculativeLoadScriptFromHead : eSpeculativeLoadScript;
mUrl.Assign(aUrl);
mCharset.Assign(aCharset);
mTypeOrCharsetSource.Assign(aType);
mCrossOrigin.Assign(aCrossOrigin);
}
inline void InitStyle(const nsAString& aUrl, const nsAString& aCharset,
const nsAString& aCrossOrigin) {
NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
"Trying to reinitialize a speculative load!");
mOpCode = eSpeculativeLoadStyle;
mUrl.Assign(aUrl);
mCharset.Assign(aCharset);
mCrossOrigin.Assign(aCrossOrigin);
}
/**
* "Speculative" manifest loads aren't truly speculative--if a manifest
* gets loaded, we are committed to it. There can never be a <script>
* before the manifest, so the situation of having to undo a manifest due
* to document.write() never arises. The reason why a parser
* thread-discovered manifest gets loaded via the speculative load queue
* as opposed to tree operation queue is that the manifest must get
* processed before any actual speculative loads such as scripts. Thus,
* manifests seen by the parser thread have to maintain the queue order
* relative to true speculative loads. See bug 541079.
*/
inline void InitManifest(const nsAString& aUrl) {
NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
"Trying to reinitialize a speculative load!");
mOpCode = eSpeculativeLoadManifest;
mUrl.Assign(aUrl);
}
/**
* "Speculative" charset setting isn't truly speculative. If the charset
* is set via this operation, we are committed to it unless chardet or
* a late meta cause a reload. The reason why a parser
* thread-discovered charset gets communicated via the speculative load
* queue as opposed to tree operation queue is that the charset change
* must get processed before any actual speculative loads such as style
* sheets. Thus, encoding decisions by the parser thread have to maintain
* the queue order relative to true speculative loads. See bug 675499.
*/
inline void InitSetDocumentCharset(nsACString& aCharset,
int32_t aCharsetSource) {
NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
"Trying to reinitialize a speculative load!");
mOpCode = eSpeculativeLoadSetDocumentCharset;
CopyUTF8toUTF16(aCharset, mCharset);
mTypeOrCharsetSource.Assign((PRUnichar)aCharsetSource);
}
void Perform(nsHtml5TreeOpExecutor* aExecutor);
private:
eHtml5SpeculativeLoad mOpCode;
nsString mUrl;
/**
* If mOpCode is eSpeculativeLoadStyle or eSpeculativeLoadScript[FromHead]
* then this is the value of the "charset" attribute. For
* eSpeculativeLoadSetDocumentCharset it is the charset that the
* document's charset is being set to. Otherwise it's empty.
*/
nsString mCharset;
/**
* If mOpCode is eSpeculativeLoadSetDocumentCharset, this is a
* one-character string whose single character's code point is to be
* interpreted as a charset source integer. Otherwise, it is empty or
* the value of the type attribute.
*/
nsString mTypeOrCharsetSource;
/**
* If mOpCode is eSpeculativeLoadImage or eSpeculativeLoadScript[FromHead],
* this is the value of the "crossorigin" attribute. If the
* attribute is not set, this will be a void string.
*/
nsString mCrossOrigin;
};
#endif // nsHtml5SpeculativeLoad_h_