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c36256e943
The existence of #1705 showed me that it's time to remove the bandaid of a fix that was `normalizeFloatString` in #1537. This patch introduces a proper Attoparsec parser for Scientific values that handles the vaguaries of cross-language floating-point syntax. We already depended on Attoparsec indirectly, so adding it as an explicit dependency is fine. A unit test is included, with examples taken from the tree-sitter corpora.
50 lines
1.5 KiB
Haskell
50 lines
1.5 KiB
Haskell
module Data.Scientific.Spec where
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import Data.Scientific.Exts
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import Data.Either
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import SpecHelpers
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spec :: Spec
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spec = describe "Scientific parsing" $ do
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let go cases = forM_ cases $ \(s, v) -> parseScientific s `shouldBe` Right v
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-- TODO: hexadecimal floats, someday (0x1.999999999999ap-4)
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it "should handle Python floats" $
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go [ ("-.6_6", -0.66)
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, ("+.1_1", 0.11)
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, ("123.4123", 123.4123)
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, ("123.123J", 123.123) -- TODO: handle complex values separately in the parser
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, ("1_1.3_1", 11.31)
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, ("1_1.", 11.0)
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, ("99E+01", 99e1)
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, ("1e+3_4j", 1e34)
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, ("3.e14", 3e14)
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, (".3e1_4", 0.3e14)
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, ("1_0.l", 10) -- this and the subsequent ones don't actually seem to be valid syntax, we should fix this in tree-sitter
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, (".3", 0.3)
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, (".1l", 0.1) -- omitting a leading 0 is deprecated in python 3, also note that the -l suffix is not valid in Python 3
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]
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it "should handle Ruby floats" $
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go [ ("1.234_5e1_0", 1.2345e10)
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, ("1E30", 1e30)
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, ("1.2i", 1.2)
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, ("1.0e+6", 1.0e6)
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, ("1.0e-6", 1.0e-6)
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]
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it "should handle JS numbers, including multiple bases" $
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go [ ("101", 101)
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, ("3.14", 3.14)
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, ("3.14e+1", 3.14e1)
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, ("0x1ABCDEFabcdef", 470375954370031)
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, ("0o7632157312", 1047060170)
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, ("0b1010101001", 681)
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]
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it "should not accept truly bad input" $ do
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parseScientific "." `shouldSatisfy` isLeft
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parseScientific "" `shouldSatisfy` isLeft
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