зеркало из https://github.com/mozilla/gecko-dev.git
448 строки
16 KiB
C++
448 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* 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/. */
|
|
|
|
/*
|
|
* nsIContentSerializer implementation that can be used with an
|
|
* nsIDocumentEncoder to convert an XML DOM to an XML string that
|
|
* could be parsed into more or less the original DOM.
|
|
*/
|
|
|
|
#ifndef nsXMLContentSerializer_h__
|
|
#define nsXMLContentSerializer_h__
|
|
|
|
#include "mozilla/Attributes.h"
|
|
#include "nsIContentSerializer.h"
|
|
#include "nsISupportsUtils.h"
|
|
#include "nsCOMPtr.h"
|
|
#include "nsTArray.h"
|
|
#include "nsString.h"
|
|
|
|
#define kIndentStr NS_LITERAL_STRING(" ")
|
|
#define kEndTag NS_LITERAL_STRING("</")
|
|
|
|
class nsAtom;
|
|
class nsINode;
|
|
|
|
namespace mozilla {
|
|
class Encoding;
|
|
}
|
|
|
|
class nsXMLContentSerializer : public nsIContentSerializer {
|
|
public:
|
|
nsXMLContentSerializer();
|
|
|
|
NS_DECL_ISUPPORTS
|
|
|
|
NS_IMETHOD Init(uint32_t flags, uint32_t aWrapColumn,
|
|
const mozilla::Encoding* aEncoding, bool aIsCopying,
|
|
bool aRewriteEncodingDeclaration,
|
|
bool* aNeedsPreformatScanning) override;
|
|
|
|
NS_IMETHOD AppendText(nsIContent* aText, int32_t aStartOffset,
|
|
int32_t aEndOffset, nsAString& aStr) override;
|
|
|
|
NS_IMETHOD AppendCDATASection(nsIContent* aCDATASection, int32_t aStartOffset,
|
|
int32_t aEndOffset, nsAString& aStr) override;
|
|
|
|
NS_IMETHOD AppendProcessingInstruction(
|
|
mozilla::dom::ProcessingInstruction* aPI, int32_t aStartOffset,
|
|
int32_t aEndOffset, nsAString& aStr) override;
|
|
|
|
NS_IMETHOD AppendComment(mozilla::dom::Comment* aComment,
|
|
int32_t aStartOffset, int32_t aEndOffset,
|
|
nsAString& aStr) override;
|
|
|
|
NS_IMETHOD AppendDoctype(mozilla::dom::DocumentType* aDoctype,
|
|
nsAString& aStr) override;
|
|
|
|
NS_IMETHOD AppendElementStart(mozilla::dom::Element* aElement,
|
|
mozilla::dom::Element* aOriginalElement,
|
|
nsAString& aStr) override;
|
|
|
|
NS_IMETHOD AppendElementEnd(mozilla::dom::Element* aElement,
|
|
nsAString& aStr) override;
|
|
|
|
NS_IMETHOD Flush(nsAString& aStr) override { return NS_OK; }
|
|
|
|
NS_IMETHOD AppendDocumentStart(mozilla::dom::Document* aDocument,
|
|
nsAString& aStr) override;
|
|
|
|
NS_IMETHOD ScanElementForPreformat(mozilla::dom::Element* aElement) override {
|
|
return NS_OK;
|
|
}
|
|
NS_IMETHOD ForgetElementForPreformat(
|
|
mozilla::dom::Element* aElement) override {
|
|
return NS_OK;
|
|
}
|
|
|
|
protected:
|
|
virtual ~nsXMLContentSerializer();
|
|
|
|
/**
|
|
* Appends a char16_t character and increments the column position
|
|
*/
|
|
MOZ_MUST_USE
|
|
bool AppendToString(const char16_t aChar, nsAString& aOutputStr);
|
|
|
|
/**
|
|
* Appends a nsAString string and increments the column position
|
|
*/
|
|
MOZ_MUST_USE
|
|
bool AppendToString(const nsAString& aStr, nsAString& aOutputStr);
|
|
|
|
/**
|
|
* Appends a string by replacing all line-endings
|
|
* by mLineBreak, except in the case of raw output.
|
|
* It increments the column position.
|
|
*/
|
|
MOZ_MUST_USE
|
|
bool AppendToStringConvertLF(const nsAString& aStr, nsAString& aOutputStr);
|
|
|
|
/**
|
|
* Appends a string by wrapping it when necessary.
|
|
* It updates the column position.
|
|
*/
|
|
MOZ_MUST_USE
|
|
bool AppendToStringWrapped(const nsAString& aStr, nsAString& aOutputStr);
|
|
|
|
/**
|
|
* Appends a string by formating and wrapping it when necessary
|
|
* It updates the column position.
|
|
*/
|
|
MOZ_MUST_USE
|
|
bool AppendToStringFormatedWrapped(const nsAString& aStr,
|
|
nsAString& aOutputStr);
|
|
|
|
// used by AppendToStringWrapped
|
|
MOZ_MUST_USE
|
|
bool AppendWrapped_WhitespaceSequence(
|
|
nsAString::const_char_iterator& aPos,
|
|
const nsAString::const_char_iterator aEnd,
|
|
const nsAString::const_char_iterator aSequenceStart,
|
|
nsAString& aOutputStr);
|
|
|
|
// used by AppendToStringFormatedWrapped
|
|
MOZ_MUST_USE
|
|
bool AppendFormatedWrapped_WhitespaceSequence(
|
|
nsAString::const_char_iterator& aPos,
|
|
const nsAString::const_char_iterator aEnd,
|
|
const nsAString::const_char_iterator aSequenceStart,
|
|
bool& aMayIgnoreStartOfLineWhitespaceSequence, nsAString& aOutputStr);
|
|
|
|
// used by AppendToStringWrapped and AppendToStringFormatedWrapped
|
|
MOZ_MUST_USE
|
|
bool AppendWrapped_NonWhitespaceSequence(
|
|
nsAString::const_char_iterator& aPos,
|
|
const nsAString::const_char_iterator aEnd,
|
|
const nsAString::const_char_iterator aSequenceStart,
|
|
bool& aMayIgnoreStartOfLineWhitespaceSequence,
|
|
bool& aSequenceStartAfterAWhiteSpace, nsAString& aOutputStr);
|
|
|
|
/**
|
|
* add mLineBreak to the string
|
|
* It updates the column position and other flags.
|
|
*/
|
|
MOZ_MUST_USE
|
|
bool AppendNewLineToString(nsAString& aOutputStr);
|
|
|
|
/**
|
|
* Appends a string by translating entities
|
|
* It doesn't increment the column position
|
|
*/
|
|
MOZ_MUST_USE
|
|
virtual bool AppendAndTranslateEntities(const nsAString& aStr,
|
|
nsAString& aOutputStr);
|
|
|
|
/**
|
|
* Helper for virtual AppendAndTranslateEntities that does the actualy work.
|
|
*
|
|
* Do not call this directly. Call it via the template helper below.
|
|
*/
|
|
private:
|
|
MOZ_MUST_USE
|
|
static bool AppendAndTranslateEntities(const nsAString& aStr,
|
|
nsAString& aOutputStr,
|
|
const uint8_t aEntityTable[],
|
|
uint16_t aMaxTableIndex,
|
|
const char* const aStringTable[]);
|
|
|
|
protected:
|
|
/**
|
|
* Helper for calling AppendAndTranslateEntities in a way that guarantees we
|
|
* don't mess up our aEntityTable sizing. This is a bit more complicated than
|
|
* it could be, becaue sometimes we don't want to use all of aEntityTable, so
|
|
* we have to allow passing the amount to use independently. But we can
|
|
* statically ensure it's not too big.
|
|
*
|
|
* The first integer template argument, which callers need to specify
|
|
* explicitly, is the index of the last entry in aEntityTable that should be
|
|
* considered for encoding as an entity reference. The second integer
|
|
* argument will be deduced from the actual table passed in.
|
|
*
|
|
* aEntityTable contains as values indices into aStringTable. Those represent
|
|
* the strings that should be used to replace the characters that are used to
|
|
* index into aEntityTable. aStringTable[0] should be nullptr, and characters
|
|
* that do not need replacement should map to 0 in aEntityTable.
|
|
*/
|
|
template <uint16_t LargestIndex, uint16_t TableLength>
|
|
MOZ_MUST_USE bool AppendAndTranslateEntities(
|
|
const nsAString& aStr, nsAString& aOutputStr,
|
|
const uint8_t (&aEntityTable)[TableLength],
|
|
const char* const aStringTable[]) {
|
|
static_assert(LargestIndex < TableLength,
|
|
"Largest allowed index must be smaller than table length");
|
|
return AppendAndTranslateEntities(aStr, aOutputStr, aEntityTable,
|
|
LargestIndex, aStringTable);
|
|
}
|
|
|
|
/**
|
|
* Max index that can be used with some of our entity tables.
|
|
*/
|
|
static const uint16_t kGTVal = 62;
|
|
|
|
/**
|
|
* retrieve the text content of the node and append it to the given string
|
|
* It doesn't increment the column position
|
|
*/
|
|
nsresult AppendTextData(nsIContent* aNode, int32_t aStartOffset,
|
|
int32_t aEndOffset, nsAString& aStr,
|
|
bool aTranslateEntities);
|
|
|
|
virtual nsresult PushNameSpaceDecl(const nsAString& aPrefix,
|
|
const nsAString& aURI, nsIContent* aOwner);
|
|
void PopNameSpaceDeclsFor(nsIContent* aOwner);
|
|
|
|
/**
|
|
* The problem that ConfirmPrefix fixes is that anyone can insert nodes
|
|
* through the DOM that have a namespace URI and a random or empty or
|
|
* previously existing prefix that's totally unrelated to the prefixes
|
|
* declared at that point through xmlns attributes. So what ConfirmPrefix
|
|
* does is ensure that we can map aPrefix to the namespace URI aURI (for
|
|
* example, that the prefix is not already mapped to some other namespace).
|
|
* aPrefix will be adjusted, if necessary, so the value of the prefix
|
|
* _after_ this call is what should be serialized.
|
|
* @param aPrefix the prefix that may need adjusting
|
|
* @param aURI the namespace URI we want aPrefix to point to
|
|
* @param aElement the element we're working with (needed for proper default
|
|
* namespace handling)
|
|
* @param aIsAttribute true if we're confirming a prefix for an attribute.
|
|
* @return true if we need to push the (prefix, uri) pair on the namespace
|
|
* stack (note that this can happen even if the prefix is
|
|
* empty).
|
|
*/
|
|
bool ConfirmPrefix(nsAString& aPrefix, const nsAString& aURI,
|
|
nsIContent* aElement, bool aIsAttribute);
|
|
/**
|
|
* GenerateNewPrefix generates a new prefix and writes it to aPrefix
|
|
*/
|
|
void GenerateNewPrefix(nsAString& aPrefix);
|
|
|
|
uint32_t ScanNamespaceDeclarations(mozilla::dom::Element* aContent,
|
|
mozilla::dom::Element* aOriginalElement,
|
|
const nsAString& aTagNamespaceURI);
|
|
|
|
MOZ_MUST_USE
|
|
virtual bool SerializeAttributes(mozilla::dom::Element* aContent,
|
|
mozilla::dom::Element* aOriginalElement,
|
|
nsAString& aTagPrefix,
|
|
const nsAString& aTagNamespaceURI,
|
|
nsAtom* aTagName, nsAString& aStr,
|
|
uint32_t aSkipAttr, bool aAddNSAttr);
|
|
|
|
MOZ_MUST_USE
|
|
bool SerializeAttr(const nsAString& aPrefix, const nsAString& aName,
|
|
const nsAString& aValue, nsAString& aStr,
|
|
bool aDoEscapeEntities);
|
|
|
|
bool IsJavaScript(nsIContent* aContent, nsAtom* aAttrNameAtom,
|
|
int32_t aAttrNamespaceID, const nsAString& aValueString);
|
|
|
|
/**
|
|
* This method can be redefined to check if the element can be serialized.
|
|
* It is called when the serialization of the start tag is asked
|
|
* (AppendElementStart)
|
|
* In this method you can also force the formating
|
|
* by setting aForceFormat to true.
|
|
* @return boolean true if the element can be output
|
|
*/
|
|
virtual bool CheckElementStart(mozilla::dom::Element* aElement,
|
|
bool& aForceFormat, nsAString& aStr,
|
|
nsresult& aResult);
|
|
|
|
/**
|
|
* This method is responsible for appending the '>' at the end of the start
|
|
* tag, possibly preceded by '/' and maybe a ' ' before that too.
|
|
*
|
|
* aElement and aOriginalElement are the same as the corresponding arguments
|
|
* to AppendElementStart.
|
|
*/
|
|
MOZ_MUST_USE
|
|
bool AppendEndOfElementStart(mozilla::dom::Element* aEleemnt,
|
|
mozilla::dom::Element* aOriginalElement,
|
|
nsAString& aStr);
|
|
|
|
/**
|
|
* This method can be redefine to serialize additional things just after
|
|
* after the serialization ot the start tag.
|
|
* (called at the end of AppendElementStart)
|
|
*/
|
|
MOZ_MUST_USE
|
|
virtual bool AfterElementStart(nsIContent* aContent,
|
|
nsIContent* aOriginalElement,
|
|
nsAString& aStr) {
|
|
return true;
|
|
};
|
|
|
|
/**
|
|
* This method can be redefined to check if the element can be serialized.
|
|
* It is called when the serialization of the end tag is asked
|
|
* (AppendElementEnd)
|
|
* In this method you can also force the formating
|
|
* by setting aForceFormat to true.
|
|
* @return boolean true if the element can be output
|
|
*/
|
|
virtual bool CheckElementEnd(mozilla::dom::Element* aElement,
|
|
bool& aForceFormat, nsAString& aStr);
|
|
|
|
/**
|
|
* This method can be redefine to serialize additional things just after
|
|
* after the serialization ot the end tag.
|
|
* (called at the end of AppendElementStart)
|
|
*/
|
|
virtual void AfterElementEnd(nsIContent* aContent, nsAString& aStr){};
|
|
|
|
/**
|
|
* Returns true if a line break should be inserted before an element open tag
|
|
*/
|
|
virtual bool LineBreakBeforeOpen(int32_t aNamespaceID, nsAtom* aName);
|
|
|
|
/**
|
|
* Returns true if a line break should be inserted after an element open tag
|
|
*/
|
|
virtual bool LineBreakAfterOpen(int32_t aNamespaceID, nsAtom* aName);
|
|
|
|
/**
|
|
* Returns true if a line break should be inserted after an element close tag
|
|
*/
|
|
virtual bool LineBreakBeforeClose(int32_t aNamespaceID, nsAtom* aName);
|
|
|
|
/**
|
|
* Returns true if a line break should be inserted after an element close tag
|
|
*/
|
|
virtual bool LineBreakAfterClose(int32_t aNamespaceID, nsAtom* aName);
|
|
|
|
/**
|
|
* add intendation. Call only in the case of formating and if the current
|
|
* position is at 0. It updates the column position.
|
|
*/
|
|
MOZ_MUST_USE
|
|
bool AppendIndentation(nsAString& aStr);
|
|
|
|
MOZ_MUST_USE
|
|
bool IncrIndentation(nsAtom* aName);
|
|
void DecrIndentation(nsAtom* aName);
|
|
|
|
// Functions to check for newlines that needs to be added between nodes in
|
|
// the root of a document. See mAddNewlineForRootNode
|
|
MOZ_MUST_USE
|
|
bool MaybeAddNewlineForRootNode(nsAString& aStr);
|
|
void MaybeFlagNewlineForRootNode(nsINode* aNode);
|
|
|
|
// Functions to check if we enter in or leave from a preformated content
|
|
virtual void MaybeEnterInPreContent(nsIContent* aNode);
|
|
virtual void MaybeLeaveFromPreContent(nsIContent* aNode);
|
|
|
|
bool ShouldMaintainPreLevel() const;
|
|
int32_t PreLevel() const {
|
|
MOZ_ASSERT(ShouldMaintainPreLevel());
|
|
return mPreLevel;
|
|
}
|
|
int32_t& PreLevel() {
|
|
MOZ_ASSERT(ShouldMaintainPreLevel());
|
|
return mPreLevel;
|
|
}
|
|
|
|
bool MaybeSerializeIsValue(mozilla::dom::Element* aElement, nsAString& aStr);
|
|
|
|
int32_t mPrefixIndex;
|
|
|
|
struct NameSpaceDecl {
|
|
nsString mPrefix;
|
|
nsString mURI;
|
|
nsIContent* mOwner;
|
|
};
|
|
|
|
nsTArray<NameSpaceDecl> mNameSpaceStack;
|
|
|
|
// nsIDocumentEncoder flags
|
|
MOZ_INIT_OUTSIDE_CTOR uint32_t mFlags;
|
|
|
|
// characters to use for line break
|
|
nsString mLineBreak;
|
|
|
|
// The charset that was passed to Init()
|
|
nsCString mCharset;
|
|
|
|
// current column position on the current line
|
|
uint32_t mColPos;
|
|
|
|
// true = pretty formating should be done (OutputFormated flag)
|
|
MOZ_INIT_OUTSIDE_CTOR bool mDoFormat;
|
|
|
|
// true = no formatting,(OutputRaw flag)
|
|
// no newline convertion and no rewrap long lines even if OutputWrap is set.
|
|
MOZ_INIT_OUTSIDE_CTOR bool mDoRaw;
|
|
|
|
// true = wrapping should be done (OutputWrap flag)
|
|
MOZ_INIT_OUTSIDE_CTOR bool mDoWrap;
|
|
|
|
// true = we can break lines (OutputDisallowLineBreaking flag)
|
|
MOZ_INIT_OUTSIDE_CTOR bool mAllowLineBreaking;
|
|
|
|
// number of maximum column in a line, in the wrap mode
|
|
MOZ_INIT_OUTSIDE_CTOR uint32_t mMaxColumn;
|
|
|
|
// current indent value
|
|
nsString mIndent;
|
|
|
|
// this is the indentation level after the indentation reached
|
|
// the maximum length of indentation
|
|
int32_t mIndentOverflow;
|
|
|
|
// says if the indentation has been already added on the current line
|
|
bool mIsIndentationAddedOnCurrentLine;
|
|
|
|
// the string which is currently added is in an attribute
|
|
bool mInAttribute;
|
|
|
|
// true = a newline character should be added. It's only
|
|
// useful when serializing root nodes. see MaybeAddNewlineForRootNode and
|
|
// MaybeFlagNewlineForRootNode
|
|
bool mAddNewlineForRootNode;
|
|
|
|
// Indicates that a space will be added if and only if content is
|
|
// continued on the same line while serializing source. Otherwise,
|
|
// the newline character acts as the whitespace and no space is needed.
|
|
// used when mDoFormat = true
|
|
bool mAddSpace;
|
|
|
|
// says that if the next string to add contains a newline character at the
|
|
// begining, then this newline character should be ignored, because a
|
|
// such character has already been added into the output string
|
|
bool mMayIgnoreLineBreakSequence;
|
|
|
|
bool mBodyOnly;
|
|
int32_t mInBody;
|
|
|
|
private:
|
|
// number of nested elements which have preformated content
|
|
MOZ_INIT_OUTSIDE_CTOR int32_t mPreLevel;
|
|
};
|
|
|
|
nsresult NS_NewXMLContentSerializer(nsIContentSerializer** aSerializer);
|
|
|
|
#endif
|