feat add pugixml

tests/pugixml_test.cc

@@ -0,0 +1,48 @@
+#include <sled/sled.h>
+
+static constexpr char kXmlA[] =
+    R"(<?xml version="1.0"?>
+<root>
+    <str>hello</str>
+    <node id="1">text1</node>
+    <node id="2">text2</node>
+    <node id="3">text3</node>
+</root>
+)";
+
+static constexpr char kXmlB[] =
+    R"(<?xml version="1.0"?>
+<root>
+    <level1>
+        <level2>
+            <node id="1">text1</node>
+            <node id="2">text2</node>
+            <node id="3">text3</node>
+        </level2>
+    </level1>
+</root>)";
+
+TEST_SUITE("pugixml")
+{
+    TEST_CASE("xpath query")
+    {
+        pugi::xml_document doc;
+        pugi::xml_parse_result result = doc.load_string(kXmlA);
+        CHECK(result);
+        pugi::xpath_node_set nodes = doc.select_nodes("//node");
+        CHECK_EQ(nodes.size(), 3);
+        CHECK_EQ(nodes[0].node().attribute("id").as_int(), 1);
+        CHECK_EQ(nodes[1].node().attribute("id").as_int(), 2);
+        CHECK_EQ(nodes[2].node().attribute("id").as_int(), 3);
+    }
+
+    TEST_CASE("xpath *")
+    {
+        pugi::xml_document doc;
+        pugi::xml_parse_result result = doc.load_string(kXmlA);
+        CHECK(result);
+        pugi::xpath_node_set nodes = doc.select_nodes("/*/str");
+        CHECK(nodes.size() == 1);
+        CHECK_EQ(std::string("hello"), nodes[0].node().text().as_string());
+    }
+}