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#include "pugixml.hpp"
#include <cstring>
inline bool is_content_root(const char* name) {
return std::strcmp(name, "abstract") == 0 || std::strcmp(name, "body") == 0;
}
// Sums length of all node_pcdata descendants (CDATA excluded to match
// quick-xml's Event::Text-only accounting).
size_t sum_pcdata(const pugi::xml_node& node) {
size_t total = 0;
for (pugi::xml_node child = node.first_child(); child; child = child.next_sibling()) {
if (child.type() == pugi::node_pcdata) {
total += std::strlen(child.value());
} else if (child.type() == pugi::node_element) {
total += sum_pcdata(child);
}
}
return total;
}
// Searches for <abstract>/<body> anywhere in the tree; once found, all
// descendant text counts regardless of further nesting.
size_t walk(const pugi::xml_node& node) {
size_t total = 0;
for (pugi::xml_node child = node.first_child(); child; child = child.next_sibling()) {
if (child.type() != pugi::node_element) continue;
if (is_content_root(child.name())) {
total += sum_pcdata(child);
} else {
total += walk(child);
}
}
return total;
}
size_t pubmed_len(char* buffer, size_t len) {
pugi::xml_document doc;
unsigned int flags = pugi::parse_default | pugi::parse_escapes;
doc.load_buffer_inplace(buffer, len, flags);
return walk(doc);
}
size_t pubmed_len_with_entities(char* buffer, size_t len) {
pugi::xml_document doc;
unsigned int flags = pugi::parse_default;
doc.load_buffer_inplace(buffer, len, flags);
return walk(doc);
}
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