Poco::XML::DOMParser

Posted by Setsu on August 6, 2010 Leave a comment (0) Go to comments

さらに、Poco::XML::NodeIterator, Poco::XML::NodeFilter, Poco::XML::NamedNodeMap も紹介します。

DOMParserTest.cpp

・Poco::XML::DOMParser をインスタンス化し、
　　setFeature(Poco::XML::DOMParser::FEATURE_WHITESPACE, false)
　で空白文字だけのエレメントを無視するように指定。
・parseString() で、const な文字列を読み込み。
・読み込んだ文字列の Poco::XML::Document を Poco::XML::NodeIterator でイテレートして各ノードの
　名前とバリューを表示し、attribute が存在すればそれも表示。

#include <Poco/DOM/DOMParser.h>
#include <Poco/DOM/Document.h>
#include <Poco/DOM/NodeIterator.h>
#include <Poco/DOM/NodeFilter.h>
#include <Poco/DOM/AutoPtr.h>
#include <Poco/DOM/NamedNodeMap.h>
#include <Poco/Exception.h>
#ifndef POCO_VERSION
#include <Poco/Version.h>
#endif
 
#include <string>
 
#include "ScopedLogMessage.h"
#include "PrepareConsoleLogger.h"
 
const std::string kXMLString =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n"
"<html xmlns=\"http://www.w3.org/1999/xhtml\">\n"
"	<head>\n"
"		<title>Sample HTML</title>\n"
"		<meta content=\"text/html; charset=utf-8\" http-equiv=\"content-type\"/>\n"
"		<link href=\"css/styles.css\" rel=\"stylesheet\" type=\"text/css\"/>\n"
"	</head>\n"
"	<body>This is a sample.</body>\n"
"</html>\n";
 
void TestDOMParser(ScopedLogMessage& msg, const std::string& xml)
{
	msg.Message("--- original xml ---\n" + xml);
	try
	{
		Poco::XML::DOMParser parser;
#if (POCO_VERSION < 0x01040000)
		parser.setFeature(Poco::XML::DOMParser::FEATURE_WHITESPACE, false);
#else
		parser.setFeature(Poco::XML::DOMParser::FEATURE_FILTER_WHITESPACE, false);
#endif
		Poco::XML::AutoPtr<Poco::XML::Document> pDoc = parser.parseString(xml);
 
		msg.Message("--- parsed ---");
 
		Poco::XML::NodeIterator itr(pDoc, Poco::XML::NodeFilter::SHOW_ALL);
		Poco::XML::Node* pNode = itr.nextNode();
		while(pNode)
		{
			std::string leading;
			Poco::XML::Node* pParentNode = pNode->parentNode();
			while(0 != pParentNode)
			{
				pParentNode = pParentNode->parentNode();
				leading += " ";
			}
 
			msg.Message(leading + pNode->nodeName() + ":" + pNode->nodeValue());
			if(pNode->hasAttributes())
			{
				for(unsigned long i=0; i<pNode->attributes()->length(); ++i)
				{
					msg.Message(	leading + " " +
							pNode->attributes()->item(i)->nodeName() +
							"=\"" +
							pNode->attributes()->item(i)->nodeValue() +
							"\"");
				}
			}
			pNode = itr.nextNode();
		}
	}
	catch(Poco::Exception& exc)
	{
		msg.Message(exc.displayText());
	}
}
 
int main(int /*argc*/, char** /*argv*/)
{
	PrepareConsoleLogger logger(Poco::Logger::ROOT, Poco::Message::PRIO_INFORMATION);
 
	ScopedLogMessage msg("DOMParserTest ", "start", "end");
 
	TestDOMParser(msg, kXMLString);
 
	return 0;
}

#include <Poco/DOM/DOMParser.h> #include <Poco/DOM/Document.h> #include <Poco/DOM/NodeIterator.h> #include <Poco/DOM/NodeFilter.h> #include <Poco/DOM/AutoPtr.h> #include <Poco/DOM/NamedNodeMap.h> #include <Poco/Exception.h> #ifndef POCO_VERSION #include <Poco/Version.h> #endif #include <string> #include "ScopedLogMessage.h" #include "PrepareConsoleLogger.h" const std::string kXMLString = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n" "<html xmlns=\"http://www.w3.org/1999/xhtml\">\n" " <head>\n" " <title>Sample HTML</title>\n" " <meta content=\"text/html; charset=utf-8\" http-equiv=\"content-type\"/>\n" " <link href=\"css/styles.css\" rel=\"stylesheet\" type=\"text/css\"/>\n" " </head>\n" " <body>This is a sample.</body>\n" "</html>\n"; void TestDOMParser(ScopedLogMessage& msg, const std::string& xml) { msg.Message("--- original xml ---\n" + xml); try { Poco::XML::DOMParser parser; #if (POCO_VERSION < 0x01040000) parser.setFeature(Poco::XML::DOMParser::FEATURE_WHITESPACE, false); #else parser.setFeature(Poco::XML::DOMParser::FEATURE_FILTER_WHITESPACE, false); #endif Poco::XML::AutoPtr<Poco::XML::Document> pDoc = parser.parseString(xml); msg.Message("--- parsed ---"); Poco::XML::NodeIterator itr(pDoc, Poco::XML::NodeFilter::SHOW_ALL); Poco::XML::Node* pNode = itr.nextNode(); while(pNode) { std::string leading; Poco::XML::Node* pParentNode = pNode->parentNode(); while(0 != pParentNode) { pParentNode = pParentNode->parentNode(); leading += " "; } msg.Message(leading + pNode->nodeName() + ":" + pNode->nodeValue()); if(pNode->hasAttributes()) { for(unsigned long i=0; i<pNode->attributes()->length(); ++i) { msg.Message( leading + " " + pNode->attributes()->item(i)->nodeName() + "=\"" + pNode->attributes()->item(i)->nodeValue() + "\""); } } pNode = itr.nextNode(); } } catch(Poco::Exception& exc) { msg.Message(exc.displayText()); } } int main(int /*argc*/, char** /*argv*/) { PrepareConsoleLogger logger(Poco::Logger::ROOT, Poco::Message::PRIO_INFORMATION); ScopedLogMessage msg("DOMParserTest ", "start", "end"); TestDOMParser(msg, kXMLString); return 0; }

Results of execution

・#document と #text は、それぞれ Poco::XML::Document と Poco::XML::Text がデフォルトで持って
　いる名称。

[0] DOMParserTest start
[0] --- original xml ---
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<title>Sample HTML</title>
		<meta content="text/html; charset=utf-8" http-equiv="content-type"/>
		<link href="css/styles.css" rel="stylesheet" type="text/css"/>
	</head>
	<body>This is a sample.</body>
</html>
 
[0] --- parsed ---
[0] #document:
[0]  html:
[0]   head:
[0]    title:
[0]     #text:Sample HTML
[0]    meta:
[0]     content="text/html; charset=utf-8"
[0]     http-equiv="content-type"
[0]    link:
[0]     href="css/styles.css"
[0]     rel="stylesheet"
[0]     type="text/css"
[0]   body:
[0]    #text:This is a sample.
[0] DOMParserTest end