Add more C++ unit tests for String to number conversions #85666
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tests/core/string/test_string.h
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| static const char *nums[4] = { "1237461283", "- 22", "0", " - 1123412" }; | ||
| static const int num[4] = { 1237461283, -22, 0, -1123412 }; | ||
| static const char *nums[13] = { "1237461283", "- 22", "0", " - 1123412", "", "10_000_000", "-1_2_3_4", "10__000", " 1 2 34 ", "-0", "007", "0b1011", "0x1012" }; | ||
| static const int num[13] = { 1237461283, -22, 0, -1123412, 0, 10000000, -1234, 10000, 1234, 0, 7, 1011, 1012 }; |
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These values are not aligned, 1011 in decimal is not the same as 1011 in binary, same for hexadecimal 1012 and decimal 1012
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"0b1011" and "0x1012" just look like a binary and a hexadecimal number, but to_int() doesn't handle them as such. to_int() ignores any non digits, so what it sees is "01011" and "01012" and then converts them as base-10, to 1011 and 1012.
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My bad, good point, that should be noted I think in the tests to clarify it's correct behavior
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I added comments for those cases. I also made some other changes as I found some new cases which hex_to_int() and bin_to_int() can't handle. For to_int() there just don't seem to be any other invalid cases than too small/large integers as all non-digits (except leading minuses) are ignored.
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tests/core/string/test_string.h
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| // Invalid float strings should return 0. | ||
| static const char *invalid_nums[6] = { "qwerty", "qwerty123", "0xffff", "0b1010", "--3.13", "__345" }; | ||
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| ERR_PRINT_OFF |
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(my bad was meant here)
Is this really required? From what I can see there's no errors on this thrown (only a warning with too high exponent, which you do not test for)
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You are correct, only hex_to_int() prints errors when the string contains illegal characters and 0 is returned.
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Now the unnecessary ERR_PRINT_OFF's are removed and "too high exponent" tests are added.
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The too high exponent case isn't triggered here as it fires with exponent of 512, unsure why it's still infinity here though
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Fixed this. There seems to be different levels of "too high exponents". Floats between 1e309 - 1e511 will become INFINITY, but warning is not printed (hex_to_int prints errors, btw). When the float gets even larger, 1e512, warning is finally printed. Don't ask me why floats work like this :)
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tests/core/string/test_string.h
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| } | ||
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| // Very large exponents. | ||
| CHECK(String("1e308").to_float() == 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.0); |
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| CHECK(String("1e308").to_float() == 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.0); | |
| CHECK(String("1e308").to_float() == 1e308); |
Unless there's some reason that won't work, or it will be very cluttered and error prone
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akien-mga
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Thanks! And congrats on your first merged contribution to the engine! |
This PR adds more C++ units tests to the following string to number conversion functions:
String::to_int()String::hex_to_int()String::bin_to_int()String::to_float()There are inconsistencies with the conversion functions, but the goal of this PR is not to fix anything, the goal is to document how the conversions currently work using the unit tests.
I'm planning to implement this godotengine/godot-proposals#8546, but I'm not touching conversion functions (even a little bit) without first adding more unit tests.