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🚑 fix for #465

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This commit is contained in:
Niels Lohmann 2017-02-20 22:48:27 +01:00
parent b04543ecc5
commit 7d14f167b8
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GPG Key ID: 7F3CEA63AE251B69
4 changed files with 27 additions and 22 deletions
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11
src/json.hpp
View File

@ -8310,16 +8310,7 @@ class basic_json
static_assert(d == 6 or d == 15 or d == 16 or d == 17,
"unexpected NumberType");
static constexpr auto fmt = d == 6 ? "%.7g"
: d == 15 ? "%.16g"
: d == 16 ? "%.17g"
: d == 17 ? "%.18g"
: "%.19g";
// I'm not sure why we need to +1 the precision,
// but without it there's a unit-test that fails
// that asserts precision of the output
snprintf(m_buf.data(), m_buf.size(), fmt, x);
snprintf(m_buf.data(), m_buf.size(), "%.*g", d, x);
// read information from locale
const auto loc = localeconv();

11
src/json.hpp.re2c
View File

@ -8310,16 +8310,7 @@ class basic_json
static_assert(d == 6 or d == 15 or d == 16 or d == 17,
"unexpected NumberType");
static constexpr auto fmt = d == 6 ? "%.7g"
: d == 15 ? "%.16g"
: d == 16 ? "%.17g"
: d == 17 ? "%.18g"
: "%.19g";
// I'm not sure why we need to +1 the precision,
// but without it there's a unit-test that fails
// that asserts precision of the output
snprintf(m_buf.data(), m_buf.size(), fmt, x);
snprintf(m_buf.data(), m_buf.size(), "%.*g", d, x);
// read information from locale
const auto loc = localeconv();

18
test/src/unit-inspection.cpp
View File

@ -250,17 +250,31 @@ TEST_CASE("object inspection")
ss.str(std::string());
// use stringstream for JSON serialization
json j_number = 3.141592653589793;
json j_number = 3.14159265358979;
ss << j_number;
// check that precision has been overridden during serialization
CHECK(ss.str() == "3.141592653589793");
CHECK(ss.str() == "3.14159265358979");
// check that precision has been restored
CHECK(ss.precision() == 3);
}
}
SECTION("round trips")
{
for (const auto& s :
{"3.141592653589793", "1000000000000000010E5"
})
{
json j1 = json::parse(s);
std::string s1 = j1.dump();
json j2 = json::parse(s1);
std::string s2 = j2.dump();
CHECK(s1 == s2);
}
}
SECTION("return the type of the object (explicit)")
{
SECTION("null")

9
test/src/unit-regression.cpp
View File

@ -783,4 +783,13 @@ TEST_CASE("regression tests")
json j = R"({"bool_value":true,"double_value":2.0,"int_value":10,"level1":{"list_value":[3,"hi",false],"tmp":5.0},"string_value":"hello"})"_json;
CHECK(j["double_value"].is_number_float());
}
SECTION("issue #465 - roundtrip error while parsing 1000000000000000010E5")
{
json j1 = json::parse("1000000000000000010E5");
std::string s1 = j1.dump();
json j2 = json::parse(s1);
std::string s2 = j2.dump();
CHECK(s1 == s2);
}
}