解析html标签工具,解析html标签内的内容

╰+哭是因爲堅強的太久メ 2022-10-09 02:28 203阅读 0赞

我正在解析html以获取每个标记内的内容。我有以下代码用于解析/重建Dom树：

\#include "DomTreeBuilder.h"

\#include

\#include "Node.h"

\#include "DomTree.h"

using namespace std;

// Populates the passed domTree with the html contents from in

void DomTreeBuilder::populateDomTreeFromString(DomTree &domTree, string &in) \{

// Parse the page

if (in.empty()) \{

// ToDO: add error handling here

\} else \{

// Check for and loop through tags

int tagIndex = in.find\_first\_of('

try \{

do \{

in = in.substr(tagIndex + 1);

parse(in, domTree);

tagIndex = in.find\_first\_of('

\} while (tagIndex != -1);

catch (int e) \{

// TODO:: Improve handling

/\*\*

\* Parses the line string and adds it to the parsed string

\*/

void DomTreeBuilder::parse(string &in, DomTree &domTree) \{

// Get tag

string tag;

int endTagIndex = in.find\_first\_of('>');

// Parse attributes out of tag

int attributeStart = in.find\_first\_of(' ');

if (attributeStart != -1 && attributeStart < endTagIndex) \{

tag = (in.substr(0, attributeStart));

\} else \{

tag = (in.substr(0, endTagIndex));

// Check if opening or closing tag

if (in.at(0) == '/')\{

tag = tag.substr(1);

domTree.closeNode(tag);

\} else \{

Node node;

node.setTag(tag);

// Get content for tag

int nextTag = in.find\_first\_of('

if (nextTag != -1) \{

string content = in.substr(endTagIndex + 1, nextTag - endTagIndex - 1);

decodeHTML(content);

node.setContent(content);

domTree.addNode(node);

in = in.substr(endTagIndex);

/\*\*

\* Decodes any character entities

\*/

void DomTreeBuilder::decodeHTML(string &line) \{

int tagIndex = line.find\_first\_of('&');

while (tagIndex != -1) \{

if (line.substr(tagIndex, 5).compare("&") == 0) \{ // Verfiy this is correct

line.erase(tagIndex + 1, 4);

\} else if (line.substr(tagIndex, 4).compare("<") == 0 ) \{ // verify this

line\[tagIndex\] = '

line.erase(tagIndex + 1, 3);

\} else if (line.substr(tagIndex, 4).compare(">") == 0) \{

line\[tagIndex\] = '>';

line.erase(tagIndex + 1, 3);

\} else \{

line = line.substr(line.find\_first\_of(';') + 1); // Remove other entities

tagIndex = line.find\_first\_of('&', tagIndex + 1);

// Remove \\r....

// TODO: This should be replaced with something better

int index;

while ((index = line.find("\\r")) != -1) \{

line.erase(index, 2);

这段代码工作正常，直到我得到一个看起来像这样的html标签：

Testing

second

Third

如果我为最外面的div运行node.getContent()，那么它内部就没有任何内容。我的猜测是我需要检查这段代码中是否有更多内容：

// Get content for tag

int nextTag = in.find\_first\_of('

if (nextTag != -1) \{

string content = in.substr(endTagIndex + 1, nextTag - endTagIndex - 1);

decodeHTML(content);

node.setContent(content);

解析html标签工具,解析html标签内的内容

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