126 lines
2.3 KiB
C++
126 lines
2.3 KiB
C++
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#include "doctest_compatibility.h"
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#define JSON_TESTS_PRIVATE
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#include <nlohmann/json.hpp>
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using nlohmann::json;
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//This struct emulate an Input Stream, once a "char" is readed from it it is lost
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struct EmulateStream
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{
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using difference_type = std::ptrdiff_t;
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using value_type = char;
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using pointer = const char*;
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using reference = const char&;
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using iterator_category = std::input_iterator_tag;
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// Like a pop_left() -> consume one char from the underlying buffer
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static char ConsumeChar(std::string* str)
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{
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const char c = str->front();
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str->erase(0, 1);
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return c;
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}
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EmulateStream()
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:
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target{nullptr}
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{}
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EmulateStream(std::string* target_)
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:
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target{target_},
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c{ConsumeChar(target_)}
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{}
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EmulateStream& operator++()
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{
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c = ConsumeChar(target);
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return *this;
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}
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bool operator!=(const EmulateStream& rhs) const
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{
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return rhs.target != target;
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}
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reference operator*() const
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{
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return c;
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}
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std::string* target;
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char c;
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};
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EmulateStream CreateBegin(std::string& tgt)
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{
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return EmulateStream{&tgt};
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}
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EmulateStream CreateEnd(const std::string& tgt)
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{
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return {};
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}
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TEST_CASE("consume only needed")
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{
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nlohmann::detail::json_sax_acceptor<json> sax_parser;
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const std::string json_A = R"({ "key_A" : "value_A" })";
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const std::string json_B = R"({ "key_B" : "value_B" })";
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std::string json_concat_AB = json_A + json_B;
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CHECK(
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json::sax_parse(
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CreateBegin(json_concat_AB),
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CreateEnd(json_concat_AB),
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&sax_parser,
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nlohmann::detail::input_format_t::json,
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false
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)
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== true
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);
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CHECK(json_concat_AB == json_B);
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CHECK(
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json::sax_parse(
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CreateBegin(json_concat_AB),
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CreateEnd(json_concat_AB),
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&sax_parser,
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nlohmann::detail::input_format_t::json,
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false
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)
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== true
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);
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CHECK(json_concat_AB == "");
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CHECK(json_concat_AB.size() == 0);
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CHECK(
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json::sax_parse(
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CreateBegin(json_concat_AB),
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CreateEnd(json_concat_AB),
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&sax_parser,
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nlohmann::detail::input_format_t::json,
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false
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)
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== false
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);
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} |