deploy: 94fe31eb9b

examples/partial_input_sax_stop.cpp

@@ -0,0 +1,81 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+struct find_id : nlohmann::json_sax<json>
+{
+    bool next_is_id = false;
+    json::number_unsigned_t id = 0;
+
+    bool key(std::string& name) override
+    {
+        next_is_id = (name == "id");
+        return true;
+    }
+
+    bool number_unsigned(json::number_unsigned_t value) override
+    {
+        if (next_is_id)
+        {
+            id = value;
+            return false; // found: stop parsing
+        }
+        return true;
+    }
+
+    bool null() override
+    {
+        return true;
+    }
+    bool boolean(bool /*val*/) override
+    {
+        return true;
+    }
+    bool number_integer(json::number_integer_t /*val*/) override
+    {
+        return true;
+    }
+    bool number_float(json::number_float_t /*val*/, const std::string& /*s*/) override
+    {
+        return true;
+    }
+    bool string(std::string& /*val*/) override
+    {
+        return true;
+    }
+    bool binary(json::binary_t& /*val*/) override
+    {
+        return true;
+    }
+    bool start_object(std::size_t /*elements*/) override
+    {
+        return true;
+    }
+    bool end_object() override
+    {
+        return true;
+    }
+    bool start_array(std::size_t /*elements*/) override
+    {
+        return true;
+    }
+    bool end_array() override
+    {
+        return true;
+    }
+    bool parse_error(std::size_t /*position*/, const std::string& /*last_token*/, const json::exception& /*ex*/) override
+    {
+        return false;
+    }
+};
+
+int main()
+{
+    find_id handler;
+    const bool completed = json::sax_parse(R"({"x": [1, 2, 3], "id": 42, "rest": [4, 5, 6]})", &handler);
+
+    std::cout << std::boolalpha;
+    std::cout << "parse completed: " << completed << '\n';
+    std::cout << "id: " << handler.id << '\n';
+}