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f9f0dd5e79
Rather than relying on the `Read` instance for `Integer`, let's make our assumptions about the format explicit. This was mostly a matter of extracting internal functions from the `Scientific` parser.
39 lines
910 B
Haskell
39 lines
910 B
Haskell
module Numeric.Spec
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( spec
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) where
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import SpecHelpers
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import Data.Either
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import Numeric.Exts
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spec :: Spec
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spec = describe "Integer parsing" $ do
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let go cases = forM_ cases $ \(s, v) -> parseInteger s `shouldBe` Right v
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it "should handle Python integers" $
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go [ ("-1", (negate 1))
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, ("0xDEAD", 0xDEAD)
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, ("0XDEAD", 0xDEAD)
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, ("1j", 1)
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, ("0o123", 83)
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, ("0O123", 83)
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, ("0b001", 1)
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, ("0B001", 1)
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, ("1_1", 11) -- underscore syntax is Python 3 only
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, ("0B1_1", 3)
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, ("0O1_1", 9)
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, ("0L", 0)
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]
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it "should handle Ruby integers" $
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go [ ("0xa_bcd_ef0_123_456_789", 0xabcdef0123456789)
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, ("01234567", 342391)
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]
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it "should not accept floating-points" $ do
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parseInteger "1.5" `shouldSatisfy` isLeft
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it "should not accept the empty string" $ do
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parseInteger "" `shouldSatisfy` isLeft
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