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Parsing HTML in C++ can be achieved using libraries that provide HTML parsing capabilities. One such popular library is Gumbo, developed by Google. Gumbo is an HTML5 parsing library that provides an easy-to-use API for extracting information from HTML documents.
Here's a basic example of parsing HTML using Gumbo in C++
Install Gumbo Library
Follow the installation instructions on the Gumbo GitHub repository to build and install the library.
Include Gumbo Headers in Your C++ Code:
#include
Write HTML Parsing Code:
#include
#include
void parseHtml(const char* html) {
GumboOutput* output = gumbo_parse(html);
// Process the parsed HTML tree
// ...
// Clean up
gumbo_destroy_output(&kGumboDefaultOptions, output);
}
int main() {
const char* html = "Sample HTML Hello, World!
";
parseHtml(html);
return 0;
}
The parseHtml function takes an HTML string as input, uses Gumbo to parse it, and then you can traverse the resulting parse tree to extract information.
Traverse the Parse Tree:
void traverseNode(GumboNode* node) {
if (node->type == GUMBO_NODE_ELEMENT) {
// Handle element node
GumboElement* element = &node->v.element;
// Extract tag name: element->tag
// Process attributes: element->attributes
} else if (node->type == GUMBO_NODE_TEXT) {
// Handle text node
GumboText* text = &node->v.text;
// Extract text content: text->text
}
// Recursively traverse child nodes
if (node->type != GUMBO_NODE_TEXT && node->v.element.children.length > 0) {
for (unsigned int i = 0; i < node->v.element.children.length; ++i) {
traverseNode(static_cast(node->v.element.children.data[i]));
}
}
}
void processParsedHtml(GumboNode* root) {
// Traverse the parsed HTML tree
traverseNode(root);
}
Modify the traverseNode function according to your needs to extract information from HTML elements and text nodes.
Compile and Run:
Compile your C++ code with the Gumbo library linked.
Run the executable.
Remember to handle memory management properly and check for errors when using Gumbo. The example above provides a basic framework, and you may need to adapt it based on the specific HTML structure you are dealing with.
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