src/xml/SkDOM.cpp - skia - Git at Google

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */


 #include "SkDOM.h"
 #include "SkStream.h"
 #include "SkXMLWriter.h"

 /////////////////////////////////////////////////////////////////////////

 #include "SkXMLParser.h"
 bool SkXMLParser::parse(const SkDOM& dom, const SkDOMNode* node)
 {
     const char* elemName = dom.getName(node);

     if (this->startElement(elemName))
         return false;

     SkDOM::AttrIter iter(dom, node);
     const char*     name, *value;

     while ((name = iter.next(&value)) != nullptr)
         if (this->addAttribute(name, value))
             return false;

     if ((node = dom.getFirstChild(node)) != nullptr)
         do {
             if (!this->parse(dom, node))
                 return false;
         } while ((node = dom.getNextSibling(node)) != nullptr);

     return !this->endElement(elemName);
 }

 /////////////////////////////////////////////////////////////////////////

 struct SkDOMAttr {
     const char* fName;
     const char* fValue;
 };

 struct SkDOMNode {
     const char* fName;
     SkDOMNode*  fFirstChild;
     SkDOMNode*  fNextSibling;
     uint16_t    fAttrCount;
     uint8_t     fType;
     uint8_t     fPad;

     const SkDOMAttr* attrs() const
     {
         return (const SkDOMAttr*)(this + 1);
     }
     SkDOMAttr* attrs()
     {
         return (SkDOMAttr*)(this + 1);
     }
 };

 /////////////////////////////////////////////////////////////////////////

 #define kMinChunkSize   512

 SkDOM::SkDOM() : fAlloc(kMinChunkSize), fRoot(nullptr)
 {
 }

 SkDOM::~SkDOM()
 {
 }

 const SkDOM::Node* SkDOM::getRootNode() const
 {
     return fRoot;
 }

 const SkDOM::Node* SkDOM::getFirstChild(const Node* node, const char name[]) const
 {
     SkASSERT(node);
     const Node* child = node->fFirstChild;

     if (name)
     {
         for (; child != nullptr; child = child->fNextSibling)
             if (!strcmp(name, child->fName))
                 break;
     }
     return child;
 }

 const SkDOM::Node* SkDOM::getNextSibling(const Node* node, const char name[]) const
 {
     SkASSERT(node);
     const Node* sibling = node->fNextSibling;
     if (name)
     {
         for (; sibling != nullptr; sibling = sibling->fNextSibling)
             if (!strcmp(name, sibling->fName))
                 break;
     }
     return sibling;
 }

 SkDOM::Type SkDOM::getType(const Node* node) const
 {
     SkASSERT(node);
     return (Type)node->fType;
 }

 const char* SkDOM::getName(const Node* node) const
 {
     SkASSERT(node);
     return node->fName;
 }

 const char* SkDOM::findAttr(const Node* node, const char name[]) const
 {
     SkASSERT(node);
     const Attr* attr = node->attrs();
     const Attr* stop = attr + node->fAttrCount;

     while (attr < stop)
     {
         if (!strcmp(attr->fName, name))
             return attr->fValue;
         attr += 1;
     }
     return nullptr;
 }

 /////////////////////////////////////////////////////////////////////////////////////

 const SkDOM::Attr* SkDOM::getFirstAttr(const Node* node) const
 {
     return node->fAttrCount ? node->attrs() : nullptr;
 }

 const SkDOM::Attr* SkDOM::getNextAttr(const Node* node, const Attr* attr) const
 {
     SkASSERT(node);
     if (attr == nullptr)
         return nullptr;
     return (attr - node->attrs() + 1) < node->fAttrCount ? attr + 1 : nullptr;
 }

 const char* SkDOM::getAttrName(const Node* node, const Attr* attr) const
 {
     SkASSERT(node);
     SkASSERT(attr);
     return attr->fName;
 }

 const char* SkDOM::getAttrValue(const Node* node, const Attr* attr) const
 {
     SkASSERT(node);
     SkASSERT(attr);
     return attr->fValue;
 }

 /////////////////////////////////////////////////////////////////////////////////////

 SkDOM::AttrIter::AttrIter(const SkDOM&, const SkDOM::Node* node)
 {
     SkASSERT(node);
     fAttr = node->attrs();
     fStop = fAttr + node->fAttrCount;
 }

 const char* SkDOM::AttrIter::next(const char** value)
 {
     const char* name = nullptr;

     if (fAttr < fStop)
     {
         name = fAttr->fName;
         if (value)
             *value = fAttr->fValue;
         fAttr += 1;
     }
     return name;
 }

 //////////////////////////////////////////////////////////////////////////////

 #include "SkXMLParser.h"
 #include "SkTDArray.h"

 static char* dupstr(SkChunkAlloc* chunk, const char src[])
 {
     SkASSERT(chunk && src);
     size_t  len = strlen(src);
     char*   dst = (char*)chunk->alloc(len + 1, SkChunkAlloc::kThrow_AllocFailType);
     memcpy(dst, src, len + 1);
     return dst;
 }

 class SkDOMParser : public SkXMLParser {
 public:
     SkDOMParser(SkChunkAlloc* chunk) : SkXMLParser(&fParserError), fAlloc(chunk)
     {
         fAlloc->reset();
         fRoot = nullptr;
         fLevel = 0;
         fNeedToFlush = true;
     }
     SkDOM::Node* getRoot() const { return fRoot; }
     SkXMLParserError fParserError;

 protected:
     void flushAttributes()
     {
         SkASSERT(fLevel > 0);

         int attrCount = fAttrs.count();

         SkDOM::Node* node = (SkDOM::Node*)fAlloc->alloc(sizeof(SkDOM::Node) + attrCount * sizeof(SkDOM::Attr),
                                                         SkChunkAlloc::kThrow_AllocFailType);

         node->fName = fElemName;
         node->fFirstChild = nullptr;
         node->fAttrCount = SkToU16(attrCount);
         node->fType = fElemType;

         if (fRoot == nullptr)
         {
             node->fNextSibling = nullptr;
             fRoot = node;
         }
         else    // this adds siblings in reverse order. gets corrected in onEndElement()
         {
             SkDOM::Node* parent = fParentStack.top();
             SkASSERT(fRoot && parent);
             node->fNextSibling = parent->fFirstChild;
             parent->fFirstChild = node;
         }
         *fParentStack.push() = node;

         sk_careful_memcpy(node->attrs(), fAttrs.begin(), attrCount * sizeof(SkDOM::Attr));
         fAttrs.reset();

     }

     bool onStartElement(const char elem[]) override {
         this->startCommon(elem, SkDOM::kElement_Type);
         return false;
     }

     bool onAddAttribute(const char name[], const char value[]) override {
         SkDOM::Attr* attr = fAttrs.append();
         attr->fName = dupstr(fAlloc, name);
         attr->fValue = dupstr(fAlloc, value);
         return false;
     }

     bool onEndElement(const char elem[]) override {
         --fLevel;
         if (fNeedToFlush)
             this->flushAttributes();
         fNeedToFlush = false;

         SkDOM::Node* parent;

         fParentStack.pop(&parent);

         SkDOM::Node* child = parent->fFirstChild;
         SkDOM::Node* prev = nullptr;
         while (child)
         {
             SkDOM::Node* next = child->fNextSibling;
             child->fNextSibling = prev;
             prev = child;
             child = next;
         }
         parent->fFirstChild = prev;
         return false;
     }

     bool onText(const char text[], int len) override {
         SkString str(text, len);
         this->startCommon(str.c_str(), SkDOM::kText_Type);
         this->SkDOMParser::onEndElement(str.c_str());

         return false;
     }

 private:
     void startCommon(const char elem[], SkDOM::Type type) {
         if (fLevel > 0 && fNeedToFlush)
             this->flushAttributes();

         fNeedToFlush = true;
         fElemName = dupstr(fAlloc, elem);
         fElemType = type;
         ++fLevel;
     }

     SkTDArray<SkDOM::Node*> fParentStack;
     SkChunkAlloc*           fAlloc;
     SkDOM::Node*            fRoot;
     bool                    fNeedToFlush;

     // state needed for flushAttributes()
     SkTDArray<SkDOM::Attr>  fAttrs;
     char*                   fElemName;
     SkDOM::Type             fElemType;
     int                     fLevel;
 };

 const SkDOM::Node* SkDOM::build(SkStream& docStream) {
     SkDOMParser parser(&fAlloc);
     if (!parser.parse(docStream))
     {
         SkDEBUGCODE(SkDebugf("xml parse error, line %d\n", parser.fParserError.getLineNumber());)
         fRoot = nullptr;
         fAlloc.reset();
         return nullptr;
     }
     fRoot = parser.getRoot();
     return fRoot;
 }

 ///////////////////////////////////////////////////////////////////////////

 static void walk_dom(const SkDOM& dom, const SkDOM::Node* node, SkXMLParser* parser)
 {
     const char* elem = dom.getName(node);
     if (dom.getType(node) == SkDOM::kText_Type) {
         SkASSERT(dom.countChildren(node) == 0);
         parser->text(elem, SkToInt(strlen(elem)));
         return;
     }

     parser->startElement(elem);

     SkDOM::AttrIter iter(dom, node);
     const char*     name;
     const char*     value;
     while ((name = iter.next(&value)) != nullptr)
         parser->addAttribute(name, value);

     node = dom.getFirstChild(node, nullptr);
     while (node)
     {
         walk_dom(dom, node, parser);
         node = dom.getNextSibling(node, nullptr);
     }

     parser->endElement(elem);
 }

 const SkDOM::Node* SkDOM::copy(const SkDOM& dom, const SkDOM::Node* node)
 {
     SkDOMParser parser(&fAlloc);

     walk_dom(dom, node, &parser);

     fRoot = parser.getRoot();
     return fRoot;
 }

 SkXMLParser* SkDOM::beginParsing() {
     SkASSERT(!fParser);
     fParser.reset(new SkDOMParser(&fAlloc));

     return fParser.get();
 }

 const SkDOM::Node* SkDOM::finishParsing() {
     SkASSERT(fParser);
     fRoot = fParser->getRoot();
     fParser.reset();

     return fRoot;
 }

 //////////////////////////////////////////////////////////////////////////

 int SkDOM::countChildren(const Node* node, const char elem[]) const
 {
     int count = 0;

     node = this->getFirstChild(node, elem);
     while (node)
     {
         count += 1;
         node = this->getNextSibling(node, elem);
     }
     return count;
 }

 //////////////////////////////////////////////////////////////////////////

 #include "SkParse.h"

 bool SkDOM::findS32(const Node* node, const char name[], int32_t* value) const
 {
     const char* vstr = this->findAttr(node, name);
     return vstr && SkParse::FindS32(vstr, value);
 }

 bool SkDOM::findScalars(const Node* node, const char name[], SkScalar value[], int count) const
 {
     const char* vstr = this->findAttr(node, name);
     return vstr && SkParse::FindScalars(vstr, value, count);
 }

 bool SkDOM::findHex(const Node* node, const char name[], uint32_t* value) const
 {
     const char* vstr = this->findAttr(node, name);
     return vstr && SkParse::FindHex(vstr, value);
 }

 bool SkDOM::findBool(const Node* node, const char name[], bool* value) const
 {
     const char* vstr = this->findAttr(node, name);
     return vstr && SkParse::FindBool(vstr, value);
 }

 int SkDOM::findList(const Node* node, const char name[], const char list[]) const
 {
     const char* vstr = this->findAttr(node, name);
     return vstr ? SkParse::FindList(vstr, list) : -1;
 }

 bool SkDOM::hasAttr(const Node* node, const char name[], const char value[]) const
 {
     const char* vstr = this->findAttr(node, name);
     return vstr && !strcmp(vstr, value);
 }

 bool SkDOM::hasS32(const Node* node, const char name[], int32_t target) const
 {
     const char* vstr = this->findAttr(node, name);
     int32_t     value;
     return vstr && SkParse::FindS32(vstr, &value) && value == target;
 }

 bool SkDOM::hasScalar(const Node* node, const char name[], SkScalar target) const
 {
     const char* vstr = this->findAttr(node, name);
     SkScalar    value;
     return vstr && SkParse::FindScalar(vstr, &value) && value == target;
 }

 bool SkDOM::hasHex(const Node* node, const char name[], uint32_t target) const
 {
     const char* vstr = this->findAttr(node, name);
     uint32_t    value;
     return vstr && SkParse::FindHex(vstr, &value) && value == target;
 }

 bool SkDOM::hasBool(const Node* node, const char name[], bool target) const
 {
     const char* vstr = this->findAttr(node, name);
     bool        value;
     return vstr && SkParse::FindBool(vstr, &value) && value == target;
 }

 //////////////////////////////////////////////////////////////////////////

 #ifdef SK_DEBUG

 void SkDOM::dump(const Node* node, int level) const
 {
     if (node == nullptr)
         node = this->getRootNode();

     SkDebugWStream debugStream;
     SkXMLStreamWriter xmlWriter(&debugStream);
     xmlWriter.writeDOM(*this, node, false);
 }

 #endif
	/*
	* Copyright 2006 The Android Open Source Project
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/


	#include "SkDOM.h"
	#include "SkStream.h"
	#include "SkXMLWriter.h"

	/////////////////////////////////////////////////////////////////////////

	#include "SkXMLParser.h"
	bool SkXMLParser::parse(const SkDOM& dom, const SkDOMNode* node)
	{
	const char* elemName = dom.getName(node);

	if (this->startElement(elemName))
	return false;

	SkDOM::AttrIter iter(dom, node);
	const char* name, *value;

	while ((name = iter.next(&value)) != nullptr)
	if (this->addAttribute(name, value))
	return false;

	if ((node = dom.getFirstChild(node)) != nullptr)
	do {
	if (!this->parse(dom, node))
	return false;
	} while ((node = dom.getNextSibling(node)) != nullptr);

	return !this->endElement(elemName);
	}

	/////////////////////////////////////////////////////////////////////////

	struct SkDOMAttr {
	const char* fName;
	const char* fValue;
	};

	struct SkDOMNode {
	const char* fName;
	SkDOMNode* fFirstChild;
	SkDOMNode* fNextSibling;
	uint16_t fAttrCount;
	uint8_t fType;
	uint8_t fPad;

	const SkDOMAttr* attrs() const
	{
	return (const SkDOMAttr*)(this + 1);
	}
	SkDOMAttr* attrs()
	{
	return (SkDOMAttr*)(this + 1);
	}
	};

	/////////////////////////////////////////////////////////////////////////

	#define kMinChunkSize 512

	SkDOM::SkDOM() : fAlloc(kMinChunkSize), fRoot(nullptr)
	{
	}

	SkDOM::~SkDOM()
	{
	}

	const SkDOM::Node* SkDOM::getRootNode() const
	{
	return fRoot;
	}

	const SkDOM::Node* SkDOM::getFirstChild(const Node* node, const char name[]) const
	{
	SkASSERT(node);
	const Node* child = node->fFirstChild;

	if (name)
	{
	for (; child != nullptr; child = child->fNextSibling)
	if (!strcmp(name, child->fName))
	break;
	}
	return child;
	}

	const SkDOM::Node* SkDOM::getNextSibling(const Node* node, const char name[]) const
	{
	SkASSERT(node);
	const Node* sibling = node->fNextSibling;
	if (name)
	{
	for (; sibling != nullptr; sibling = sibling->fNextSibling)
	if (!strcmp(name, sibling->fName))
	break;
	}
	return sibling;
	}

	SkDOM::Type SkDOM::getType(const Node* node) const
	{
	SkASSERT(node);
	return (Type)node->fType;
	}

	const char* SkDOM::getName(const Node* node) const
	{
	SkASSERT(node);
	return node->fName;
	}

	const char* SkDOM::findAttr(const Node* node, const char name[]) const
	{
	SkASSERT(node);
	const Attr* attr = node->attrs();
	const Attr* stop = attr + node->fAttrCount;

	while (attr < stop)
	{
	if (!strcmp(attr->fName, name))
	return attr->fValue;
	attr += 1;
	}
	return nullptr;
	}

	/////////////////////////////////////////////////////////////////////////////////////

	const SkDOM::Attr* SkDOM::getFirstAttr(const Node* node) const
	{
	return node->fAttrCount ? node->attrs() : nullptr;
	}

	const SkDOM::Attr* SkDOM::getNextAttr(const Node* node, const Attr* attr) const
	{
	SkASSERT(node);
	if (attr == nullptr)
	return nullptr;
	return (attr - node->attrs() + 1) < node->fAttrCount ? attr + 1 : nullptr;
	}

	const char* SkDOM::getAttrName(const Node* node, const Attr* attr) const
	{
	SkASSERT(node);
	SkASSERT(attr);
	return attr->fName;
	}

	const char* SkDOM::getAttrValue(const Node* node, const Attr* attr) const
	{
	SkASSERT(node);
	SkASSERT(attr);
	return attr->fValue;
	}

	/////////////////////////////////////////////////////////////////////////////////////

	SkDOM::AttrIter::AttrIter(const SkDOM&, const SkDOM::Node* node)
	{
	SkASSERT(node);
	fAttr = node->attrs();
	fStop = fAttr + node->fAttrCount;
	}

	const char* SkDOM::AttrIter::next(const char** value)
	{
	const char* name = nullptr;

	if (fAttr < fStop)
	{
	name = fAttr->fName;
	if (value)
	*value = fAttr->fValue;
	fAttr += 1;
	}
	return name;
	}

	//////////////////////////////////////////////////////////////////////////////

	#include "SkXMLParser.h"
	#include "SkTDArray.h"

	static char* dupstr(SkChunkAlloc* chunk, const char src[])
	{
	SkASSERT(chunk && src);
	size_t len = strlen(src);
	char* dst = (char*)chunk->alloc(len + 1, SkChunkAlloc::kThrow_AllocFailType);
	memcpy(dst, src, len + 1);
	return dst;
	}

	class SkDOMParser : public SkXMLParser {
	public:
	SkDOMParser(SkChunkAlloc* chunk) : SkXMLParser(&fParserError), fAlloc(chunk)
	{
	fAlloc->reset();
	fRoot = nullptr;
	fLevel = 0;
	fNeedToFlush = true;
	}
	SkDOM::Node* getRoot() const { return fRoot; }
	SkXMLParserError fParserError;

	protected:
	void flushAttributes()
	{
	SkASSERT(fLevel > 0);

	int attrCount = fAttrs.count();

	SkDOM::Node* node = (SkDOM::Node)fAlloc->alloc(sizeof(SkDOM::Node) + attrCount sizeof(SkDOM::Attr),
	SkChunkAlloc::kThrow_AllocFailType);

	node->fName = fElemName;
	node->fFirstChild = nullptr;
	node->fAttrCount = SkToU16(attrCount);
	node->fType = fElemType;

	if (fRoot == nullptr)
	{
	node->fNextSibling = nullptr;
	fRoot = node;
	}
	else // this adds siblings in reverse order. gets corrected in onEndElement()
	{
	SkDOM::Node* parent = fParentStack.top();
	SkASSERT(fRoot && parent);
	node->fNextSibling = parent->fFirstChild;
	parent->fFirstChild = node;
	}
	*fParentStack.push() = node;

	sk_careful_memcpy(node->attrs(), fAttrs.begin(), attrCount * sizeof(SkDOM::Attr));
	fAttrs.reset();

	}

	bool onStartElement(const char elem[]) override {
	this->startCommon(elem, SkDOM::kElement_Type);
	return false;
	}

	bool onAddAttribute(const char name[], const char value[]) override {
	SkDOM::Attr* attr = fAttrs.append();
	attr->fName = dupstr(fAlloc, name);
	attr->fValue = dupstr(fAlloc, value);
	return false;
	}

	bool onEndElement(const char elem[]) override {
	--fLevel;
	if (fNeedToFlush)
	this->flushAttributes();
	fNeedToFlush = false;

	SkDOM::Node* parent;

	fParentStack.pop(&parent);

	SkDOM::Node* child = parent->fFirstChild;
	SkDOM::Node* prev = nullptr;
	while (child)
	{
	SkDOM::Node* next = child->fNextSibling;
	child->fNextSibling = prev;
	prev = child;
	child = next;
	}
	parent->fFirstChild = prev;
	return false;
	}

	bool onText(const char text[], int len) override {
	SkString str(text, len);
	this->startCommon(str.c_str(), SkDOM::kText_Type);
	this->SkDOMParser::onEndElement(str.c_str());

	return false;
	}

	private:
	void startCommon(const char elem[], SkDOM::Type type) {
	if (fLevel > 0 && fNeedToFlush)
	this->flushAttributes();

	fNeedToFlush = true;
	fElemName = dupstr(fAlloc, elem);
	fElemType = type;
	++fLevel;
	}

	SkTDArray<SkDOM::Node*> fParentStack;
	SkChunkAlloc* fAlloc;
	SkDOM::Node* fRoot;
	bool fNeedToFlush;

	// state needed for flushAttributes()
	SkTDArray<SkDOM::Attr> fAttrs;
	char* fElemName;
	SkDOM::Type fElemType;
	int fLevel;
	};

	const SkDOM::Node* SkDOM::build(SkStream& docStream) {
	SkDOMParser parser(&fAlloc);
	if (!parser.parse(docStream))
	{
	SkDEBUGCODE(SkDebugf("xml parse error, line %d\n", parser.fParserError.getLineNumber());)
	fRoot = nullptr;
	fAlloc.reset();
	return nullptr;
	}
	fRoot = parser.getRoot();
	return fRoot;
	}

	///////////////////////////////////////////////////////////////////////////

	static void walk_dom(const SkDOM& dom, const SkDOM::Node* node, SkXMLParser* parser)
	{
	const char* elem = dom.getName(node);
	if (dom.getType(node) == SkDOM::kText_Type) {
	SkASSERT(dom.countChildren(node) == 0);
	parser->text(elem, SkToInt(strlen(elem)));
	return;
	}

	parser->startElement(elem);

	SkDOM::AttrIter iter(dom, node);
	const char* name;
	const char* value;
	while ((name = iter.next(&value)) != nullptr)
	parser->addAttribute(name, value);

	node = dom.getFirstChild(node, nullptr);
	while (node)
	{
	walk_dom(dom, node, parser);
	node = dom.getNextSibling(node, nullptr);
	}

	parser->endElement(elem);
	}

	const SkDOM::Node* SkDOM::copy(const SkDOM& dom, const SkDOM::Node* node)
	{
	SkDOMParser parser(&fAlloc);

	walk_dom(dom, node, &parser);

	fRoot = parser.getRoot();
	return fRoot;
	}

	SkXMLParser* SkDOM::beginParsing() {
	SkASSERT(!fParser);
	fParser.reset(new SkDOMParser(&fAlloc));

	return fParser.get();
	}

	const SkDOM::Node* SkDOM::finishParsing() {
	SkASSERT(fParser);
	fRoot = fParser->getRoot();
	fParser.reset();

	return fRoot;
	}

	//////////////////////////////////////////////////////////////////////////

	int SkDOM::countChildren(const Node* node, const char elem[]) const
	{
	int count = 0;

	node = this->getFirstChild(node, elem);
	while (node)
	{
	count += 1;
	node = this->getNextSibling(node, elem);
	}
	return count;
	}

	//////////////////////////////////////////////////////////////////////////

	#include "SkParse.h"

	bool SkDOM::findS32(const Node* node, const char name[], int32_t* value) const
	{
	const char* vstr = this->findAttr(node, name);
	return vstr && SkParse::FindS32(vstr, value);
	}

	bool SkDOM::findScalars(const Node* node, const char name[], SkScalar value[], int count) const
	{
	const char* vstr = this->findAttr(node, name);
	return vstr && SkParse::FindScalars(vstr, value, count);
	}

	bool SkDOM::findHex(const Node* node, const char name[], uint32_t* value) const
	{
	const char* vstr = this->findAttr(node, name);
	return vstr && SkParse::FindHex(vstr, value);
	}

	bool SkDOM::findBool(const Node* node, const char name[], bool* value) const
	{
	const char* vstr = this->findAttr(node, name);
	return vstr && SkParse::FindBool(vstr, value);
	}

	int SkDOM::findList(const Node* node, const char name[], const char list[]) const
	{
	const char* vstr = this->findAttr(node, name);
	return vstr ? SkParse::FindList(vstr, list) : -1;
	}

	bool SkDOM::hasAttr(const Node* node, const char name[], const char value[]) const
	{
	const char* vstr = this->findAttr(node, name);
	return vstr && !strcmp(vstr, value);
	}

	bool SkDOM::hasS32(const Node* node, const char name[], int32_t target) const
	{
	const char* vstr = this->findAttr(node, name);
	int32_t value;
	return vstr && SkParse::FindS32(vstr, &value) && value == target;
	}

	bool SkDOM::hasScalar(const Node* node, const char name[], SkScalar target) const
	{
	const char* vstr = this->findAttr(node, name);
	SkScalar value;
	return vstr && SkParse::FindScalar(vstr, &value) && value == target;
	}

	bool SkDOM::hasHex(const Node* node, const char name[], uint32_t target) const
	{
	const char* vstr = this->findAttr(node, name);
	uint32_t value;
	return vstr && SkParse::FindHex(vstr, &value) && value == target;
	}

	bool SkDOM::hasBool(const Node* node, const char name[], bool target) const
	{
	const char* vstr = this->findAttr(node, name);
	bool value;
	return vstr && SkParse::FindBool(vstr, &value) && value == target;
	}

	//////////////////////////////////////////////////////////////////////////

	#ifdef SK_DEBUG

	void SkDOM::dump(const Node* node, int level) const
	{
	if (node == nullptr)
	node = this->getRootNode();

	SkDebugWStream debugStream;
	SkXMLStreamWriter xmlWriter(&debugStream);
	xmlWriter.writeDOM(*this, node, false);
	}

	#endif