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9bfa11387d
Instead of committing to a number of decimal places, the new algorithm targets a certain number of significant digits. Since the mantissa has to fit in a 32-bit integer, the number of significant digits is limited to 9.
126 lines
3.3 KiB
C++
126 lines
3.3 KiB
C++
// ArduinoJson - https://arduinojson.org
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// Copyright © 2014-2025, Benoit BLANCHON
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// MIT License
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#include <catch.hpp>
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#include <limits>
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#include <string>
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#define ARDUINOJSON_ENABLE_NAN 1
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#define ARDUINOJSON_ENABLE_INFINITY 1
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#include <ArduinoJson/Json/TextFormatter.hpp>
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#include <ArduinoJson/Serialization/Writer.hpp>
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using namespace ArduinoJson::detail;
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template <typename TFloat>
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static std::string toString(TFloat input) {
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std::string output;
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Writer<std::string> sb(output);
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TextFormatter<Writer<std::string>> writer(sb);
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writer.writeFloat(input);
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return output;
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}
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TEST_CASE("TextFormatter::writeFloat(double)") {
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SECTION("Pi") {
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REQUIRE(toString(3.14159265359) == "3.14159265");
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}
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SECTION("Signaling NaN") {
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double nan = std::numeric_limits<double>::signaling_NaN();
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REQUIRE(toString(nan) == "NaN");
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}
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SECTION("Quiet NaN") {
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double nan = std::numeric_limits<double>::quiet_NaN();
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REQUIRE(toString(nan) == "NaN");
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}
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SECTION("Infinity") {
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double inf = std::numeric_limits<double>::infinity();
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REQUIRE(toString(inf) == "Infinity");
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REQUIRE(toString(-inf) == "-Infinity");
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}
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SECTION("Zero") {
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REQUIRE(toString(0.0) == "0");
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REQUIRE(toString(-0.0) == "0");
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}
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SECTION("Espilon") {
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REQUIRE(toString(2.2250738585072014E-308) == "2.22507386e-308");
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REQUIRE(toString(-2.2250738585072014E-308) == "-2.22507386e-308");
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}
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SECTION("Max double") {
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REQUIRE(toString(1.7976931348623157E+308) == "1.79769313e308");
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REQUIRE(toString(-1.7976931348623157E+308) == "-1.79769313e308");
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}
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SECTION("Big exponent") {
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REQUIRE(toString(1e255) == "1e255");
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REQUIRE(toString(1e-255) == "1e-255");
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}
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SECTION("Exponentation when <= 1e-5") {
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REQUIRE(toString(1e-4) == "0.0001");
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REQUIRE(toString(1e-5) == "1e-5");
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REQUIRE(toString(-1e-4) == "-0.0001");
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REQUIRE(toString(-1e-5) == "-1e-5");
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}
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SECTION("Exponentation when >= 1e7") {
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REQUIRE(toString(9999999.99) == "9999999.99");
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REQUIRE(toString(10000000.0) == "1e7");
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REQUIRE(toString(-9999999.99) == "-9999999.99");
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REQUIRE(toString(-10000000.0) == "-1e7");
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}
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SECTION("Rounding when too many decimals") {
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REQUIRE(toString(0.000099999999999) == "0.0001");
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REQUIRE(toString(0.0000099999999999) == "1e-5");
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REQUIRE(toString(0.9999999996) == "1");
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}
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SECTION("9 decimal places") {
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REQUIRE(toString(0.10000001) == "0.10000001");
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REQUIRE(toString(0.99999999) == "0.99999999");
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REQUIRE(toString(9.00000001) == "9.00000001");
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REQUIRE(toString(9.99999999) == "9.99999999");
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}
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SECTION("9 decimal places") {
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REQUIRE(toString(0.100000001) == "0.100000001");
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REQUIRE(toString(0.999999999) == "0.999999999");
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REQUIRE(toString(9.000000001) == "9");
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REQUIRE(toString(9.999999999) == "10");
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}
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SECTION("10 decimal places") {
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REQUIRE(toString(0.1000000001) == "0.1");
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REQUIRE(toString(0.9999999999) == "1");
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REQUIRE(toString(9.0000000001) == "9");
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REQUIRE(toString(9.9999999999) == "10");
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}
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}
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TEST_CASE("TextFormatter::writeFloat(float)") {
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SECTION("Pi") {
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REQUIRE(toString(3.14159265359f) == "3.141593");
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}
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SECTION("999.9") { // issue #543
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REQUIRE(toString(999.9f) == "999.9");
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}
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SECTION("24.3") { // # issue #588
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REQUIRE(toString(24.3f) == "24.3");
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}
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}
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