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annotate dep/pugixml/docs/samples/xpath_query.cpp @ 187:9613d72b097e

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*: multiple performance improvements like marking `static const` when it makes sense... date: change old stupid heap-based method to a structure which should make copying the thing actually make a copy. also many performance-based changes, like removing the std::tie dependency and forward-declaring nlohmann json *: replace every instance of QString::fromUtf8 to Strings::ToQString. the main difference is that our function will always convert exactly what is in the string, while some other times it would only convert up to the nearest NUL byte
author Paper <mrpapersonic@gmail.com>
date Wed, 06 Dec 2023 13:43:54 -0500
parents d10b6c6b432e
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1 #include "pugixml.hpp"
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2
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3 #include <iostream>
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4 #include <string>
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5
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6 int main()
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7 {
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8 pugi::xml_document doc;
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9 if (!doc.load_file("xgconsole.xml")) return -1;
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10
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11 // tag::code[]
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12 // Select nodes via compiled query
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13 pugi::xpath_query query_remote_tools("/Profile/Tools/Tool[@AllowRemote='true']");
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14
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15 pugi::xpath_node_set tools = query_remote_tools.evaluate_node_set(doc);
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16 std::cout << "Remote tool: ";
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17 tools[2].node().print(std::cout);
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18
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19 // Evaluate numbers via compiled query
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20 pugi::xpath_query query_timeouts("sum(//Tool/@Timeout)");
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21 std::cout << query_timeouts.evaluate_number(doc) << std::endl;
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22
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23 // Evaluate strings via compiled query for different context nodes
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24 pugi::xpath_query query_name_valid("string-length(substring-before(@Filename, '_')) > 0 and @OutputFileMasks");
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25 pugi::xpath_query query_name("concat(substring-before(@Filename, '_'), ' produces ', @OutputFileMasks)");
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26
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27 for (pugi::xml_node tool = doc.first_element_by_path("Profile/Tools/Tool"); tool; tool = tool.next_sibling())
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28 {
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29 std::string s = query_name.evaluate_string(tool);
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30
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31 if (query_name_valid.evaluate_boolean(tool)) std::cout << s << std::endl;
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32 }
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33 // end::code[]
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34 }
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35
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36 // vim:et