diff --git a/ChangeLog.md b/ChangeLog.md new file mode 100644 --- /dev/null +++ b/ChangeLog.md @@ -0,0 +1,4 @@ +# Revision history for IntFormats + +* 0.1.0.0 released 2019-10-11 + * Initial version diff --git a/IntFormats.cabal b/IntFormats.cabal new file mode 100644 --- /dev/null +++ b/IntFormats.cabal @@ -0,0 +1,35 @@ +name: IntFormats +version: 0.1.0.0 +synopsis: Convert integers in various bases to and from strings +description: Parse or show positive and negative intergers in decimal, hexadecimal, octal, and binary. + When parsing numbers, the base is determined automatically. +homepage: https://github.com/LyraSolomon/IntFormats +license: MPL-2.0 +license-file: LICENSE +author: Lyra Solomon +maintainer: Lyra Solomon +copyright: Lyra Solomon 2019 +bug-reports: https://github.com/LyraSolomon/IntFormats/issues +category: Text +build-type: Simple +cabal-version: >=1.10 + +source-repository head + type: git + location: https://github.com/LyraSolomon/IntFormats.git + +library + exposed-modules: Text.IntFormats + hs-source-dirs: src + build-depends: base ==4.9.*, parsec ==3.1.*, QuickCheck ==2.13.* + default-language: Haskell2010 + ghc-options: -Wall + other-extensions: FlexibleContexts + +test-suite tests + type: exitcode-stdio-1.0 + main-is: Spec.hs + hs-source-dirs: test + build-depends: base ==4.9.*, hspec ==2.7.*, QuickCheck ==2.13.*, IntFormats + default-language: Haskell2010 + ghc-options: -Wall diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,373 @@ +Mozilla Public License Version 2.0 +================================== + +1. Definitions +-------------- + +1.1. "Contributor" + means each individual or legal entity that creates, contributes to + the creation of, or owns Covered Software. + +1.2. "Contributor Version" + means the combination of the Contributions of others (if any) used + by a Contributor and that particular Contributor's Contribution. + +1.3. "Contribution" + means Covered Software of a particular Contributor. + +1.4. "Covered Software" + means Source Code Form to which the initial Contributor has attached + the notice in Exhibit A, the Executable Form of such Source Code + Form, and Modifications of such Source Code Form, in each case + including portions thereof. + +1.5. "Incompatible With Secondary Licenses" + means + + (a) that the initial Contributor has attached the notice described + in Exhibit B to the Covered Software; or + + (b) that the Covered Software was made available under the terms of + version 1.1 or earlier of the License, but not also under the + terms of a Secondary License. + +1.6. "Executable Form" + means any form of the work other than Source Code Form. + +1.7. "Larger Work" + means a work that combines Covered Software with other material, in + a separate file or files, that is not Covered Software. + +1.8. "License" + means this document. + +1.9. "Licensable" + means having the right to grant, to the maximum extent possible, + whether at the time of the initial grant or subsequently, any and + all of the rights conveyed by this License. + +1.10. "Modifications" + means any of the following: + + (a) any file in Source Code Form that results from an addition to, + deletion from, or modification of the contents of Covered + Software; or + + (b) any new file in Source Code Form that contains any Covered + Software. + +1.11. "Patent Claims" of a Contributor + means any patent claim(s), including without limitation, method, + process, and apparatus claims, in any patent Licensable by such + Contributor that would be infringed, but for the grant of the + License, by the making, using, selling, offering for sale, having + made, import, or transfer of either its Contributions or its + Contributor Version. + +1.12. "Secondary License" + means either the GNU General Public License, Version 2.0, the GNU + Lesser General Public License, Version 2.1, the GNU Affero General + Public License, Version 3.0, or any later versions of those + licenses. + +1.13. "Source Code Form" + means the form of the work preferred for making modifications. + +1.14. "You" (or "Your") + means an individual or a legal entity exercising rights under this + License. For legal entities, "You" includes any entity that + controls, is controlled by, or is under common control with You. For + purposes of this definition, "control" means (a) the power, direct + or indirect, to cause the direction or management of such entity, + whether by contract or otherwise, or (b) ownership of more than + fifty percent (50%) of the outstanding shares or beneficial + ownership of such entity. + +2. License Grants and Conditions +-------------------------------- + +2.1. Grants + +Each Contributor hereby grants You a world-wide, royalty-free, +non-exclusive license: + +(a) under intellectual property rights (other than patent or trademark) + Licensable by such Contributor to use, reproduce, make available, + modify, display, perform, distribute, and otherwise exploit its + Contributions, either on an unmodified basis, with Modifications, or + as part of a Larger Work; and + +(b) under Patent Claims of such Contributor to make, use, sell, offer + for sale, have made, import, and otherwise transfer either its + Contributions or its Contributor Version. + +2.2. Effective Date + +The licenses granted in Section 2.1 with respect to any Contribution +become effective for each Contribution on the date the Contributor first +distributes such Contribution. + +2.3. Limitations on Grant Scope + +The licenses granted in this Section 2 are the only rights granted under +this License. No additional rights or licenses will be implied from the +distribution or licensing of Covered Software under this License. +Notwithstanding Section 2.1(b) above, no patent license is granted by a +Contributor: + +(a) for any code that a Contributor has removed from Covered Software; + or + +(b) for infringements caused by: (i) Your and any other third party's + modifications of Covered Software, or (ii) the combination of its + Contributions with other software (except as part of its Contributor + Version); or + +(c) under Patent Claims infringed by Covered Software in the absence of + its Contributions. + +This License does not grant any rights in the trademarks, service marks, +or logos of any Contributor (except as may be necessary to comply with +the notice requirements in Section 3.4). + +2.4. Subsequent Licenses + +No Contributor makes additional grants as a result of Your choice to +distribute the Covered Software under a subsequent version of this +License (see Section 10.2) or under the terms of a Secondary License (if +permitted under the terms of Section 3.3). + +2.5. Representation + +Each Contributor represents that the Contributor believes its +Contributions are its original creation(s) or it has sufficient rights +to grant the rights to its Contributions conveyed by this License. + +2.6. Fair Use + +This License is not intended to limit any rights You have under +applicable copyright doctrines of fair use, fair dealing, or other +equivalents. + +2.7. Conditions + +Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted +in Section 2.1. + +3. Responsibilities +------------------- + +3.1. Distribution of Source Form + +All distribution of Covered Software in Source Code Form, including any +Modifications that You create or to which You contribute, must be under +the terms of this License. You must inform recipients that the Source +Code Form of the Covered Software is governed by the terms of this +License, and how they can obtain a copy of this License. You may not +attempt to alter or restrict the recipients' rights in the Source Code +Form. + +3.2. Distribution of Executable Form + +If You distribute Covered Software in Executable Form then: + +(a) such Covered Software must also be made available in Source Code + Form, as described in Section 3.1, and You must inform recipients of + the Executable Form how they can obtain a copy of such Source Code + Form by reasonable means in a timely manner, at a charge no more + than the cost of distribution to the recipient; and + +(b) You may distribute such Executable Form under the terms of this + License, or sublicense it under different terms, provided that the + license for the Executable Form does not attempt to limit or alter + the recipients' rights in the Source Code Form under this License. + +3.3. Distribution of a Larger Work + +You may create and distribute a Larger Work under terms of Your choice, +provided that You also comply with the requirements of this License for +the Covered Software. If the Larger Work is a combination of Covered +Software with a work governed by one or more Secondary Licenses, and the +Covered Software is not Incompatible With Secondary Licenses, this +License permits You to additionally distribute such Covered Software +under the terms of such Secondary License(s), so that the recipient of +the Larger Work may, at their option, further distribute the Covered +Software under the terms of either this License or such Secondary +License(s). + +3.4. Notices + +You may not remove or alter the substance of any license notices +(including copyright notices, patent notices, disclaimers of warranty, +or limitations of liability) contained within the Source Code Form of +the Covered Software, except that You may alter any license notices to +the extent required to remedy known factual inaccuracies. + +3.5. Application of Additional Terms + +You may choose to offer, and to charge a fee for, warranty, support, +indemnity or liability obligations to one or more recipients of Covered +Software. However, You may do so only on Your own behalf, and not on +behalf of any Contributor. You must make it absolutely clear that any +such warranty, support, indemnity, or liability obligation is offered by +You alone, and You hereby agree to indemnify every Contributor for any +liability incurred by such Contributor as a result of warranty, support, +indemnity or liability terms You offer. You may include additional +disclaimers of warranty and limitations of liability specific to any +jurisdiction. + +4. Inability to Comply Due to Statute or Regulation +--------------------------------------------------- + +If it is impossible for You to comply with any of the terms of this +License with respect to some or all of the Covered Software due to +statute, judicial order, or regulation then You must: (a) comply with +the terms of this License to the maximum extent possible; and (b) +describe the limitations and the code they affect. Such description must +be placed in a text file included with all distributions of the Covered +Software under this License. Except to the extent prohibited by statute +or regulation, such description must be sufficiently detailed for a +recipient of ordinary skill to be able to understand it. + +5. Termination +-------------- + +5.1. The rights granted under this License will terminate automatically +if You fail to comply with any of its terms. However, if You become +compliant, then the rights granted under this License from a particular +Contributor are reinstated (a) provisionally, unless and until such +Contributor explicitly and finally terminates Your grants, and (b) on an +ongoing basis, if such Contributor fails to notify You of the +non-compliance by some reasonable means prior to 60 days after You have +come back into compliance. Moreover, Your grants from a particular +Contributor are reinstated on an ongoing basis if such Contributor +notifies You of the non-compliance by some reasonable means, this is the +first time You have received notice of non-compliance with this License +from such Contributor, and You become compliant prior to 30 days after +Your receipt of the notice. + +5.2. If You initiate litigation against any entity by asserting a patent +infringement claim (excluding declaratory judgment actions, +counter-claims, and cross-claims) alleging that a Contributor Version +directly or indirectly infringes any patent, then the rights granted to +You by any and all Contributors for the Covered Software under Section +2.1 of this License shall terminate. + +5.3. In the event of termination under Sections 5.1 or 5.2 above, all +end user license agreements (excluding distributors and resellers) which +have been validly granted by You or Your distributors under this License +prior to termination shall survive termination. + +************************************************************************ +* * +* 6. Disclaimer of Warranty * +* ------------------------- * +* * +* Covered Software is provided under this License on an "as is" * +* basis, without warranty of any kind, either expressed, implied, or * +* statutory, including, without limitation, warranties that the * +* Covered Software is free of defects, merchantable, fit for a * +* particular purpose or non-infringing. The entire risk as to the * +* quality and performance of the Covered Software is with You. * +* Should any Covered Software prove defective in any respect, You * +* (not any Contributor) assume the cost of any necessary servicing, * +* repair, or correction. This disclaimer of warranty constitutes an * +* essential part of this License. No use of any Covered Software is * +* authorized under this License except under this disclaimer. * +* * +************************************************************************ + +************************************************************************ +* * +* 7. Limitation of Liability * +* -------------------------- * +* * +* Under no circumstances and under no legal theory, whether tort * +* (including negligence), contract, or otherwise, shall any * +* Contributor, or anyone who distributes Covered Software as * +* permitted above, be liable to You for any direct, indirect, * +* special, incidental, or consequential damages of any character * +* including, without limitation, damages for lost profits, loss of * +* goodwill, work stoppage, computer failure or malfunction, or any * +* and all other commercial damages or losses, even if such party * +* shall have been informed of the possibility of such damages. This * +* limitation of liability shall not apply to liability for death or * +* personal injury resulting from such party's negligence to the * +* extent applicable law prohibits such limitation. Some * +* jurisdictions do not allow the exclusion or limitation of * +* incidental or consequential damages, so this exclusion and * +* limitation may not apply to You. * +* * +************************************************************************ + +8. Litigation +------------- + +Any litigation relating to this License may be brought only in the +courts of a jurisdiction where the defendant maintains its principal +place of business and such litigation shall be governed by laws of that +jurisdiction, without reference to its conflict-of-law provisions. +Nothing in this Section shall prevent a party's ability to bring +cross-claims or counter-claims. + +9. Miscellaneous +---------------- + +This License represents the complete agreement concerning the subject +matter hereof. If any provision of this License is held to be +unenforceable, such provision shall be reformed only to the extent +necessary to make it enforceable. Any law or regulation which provides +that the language of a contract shall be construed against the drafter +shall not be used to construe this License against a Contributor. + +10. Versions of the License +--------------------------- + +10.1. New Versions + +Mozilla Foundation is the license steward. Except as provided in Section +10.3, no one other than the license steward has the right to modify or +publish new versions of this License. Each version will be given a +distinguishing version number. + +10.2. Effect of New Versions + +You may distribute the Covered Software under the terms of the version +of the License under which You originally received the Covered Software, +or under the terms of any subsequent version published by the license +steward. + +10.3. Modified Versions + +If you create software not governed by this License, and you want to +create a new license for such software, you may create and use a +modified version of this License if you rename the license and remove +any references to the name of the license steward (except to note that +such modified license differs from this License). + +10.4. Distributing Source Code Form that is Incompatible With Secondary +Licenses + +If You choose to distribute Source Code Form that is Incompatible With +Secondary Licenses under the terms of this version of the License, the +notice described in Exhibit B of this License must be attached. + +Exhibit A - Source Code Form License Notice +------------------------------------------- + + This Source Code Form is subject to the terms of the Mozilla Public + License, v. 2.0. If a copy of the MPL was not distributed with this + file, You can obtain one at http://mozilla.org/MPL/2.0/. + +If it is not possible or desirable to put the notice in a particular +file, then You may include the notice in a location (such as a LICENSE +file in a relevant directory) where a recipient would be likely to look +for such a notice. + +You may add additional accurate notices of copyright ownership. + +Exhibit B - "Incompatible With Secondary Licenses" Notice +--------------------------------------------------------- + + This Source Code Form is "Incompatible With Secondary Licenses", as + defined by the Mozilla Public License, v. 2.0. diff --git a/README.md b/README.md new file mode 100644 --- /dev/null +++ b/README.md @@ -0,0 +1,9 @@ +# Text.IntFormats Haskell Library + +This library includes functions for converting from a string to an integer, +with the base determined automatically, and from an integer to a string, +with the user specifying the base. Supports negative numbers. + +## Bug? Possible improvements? Let me know! + +Just open an issue or pull request diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/src/Text/IntFormats.hs b/src/Text/IntFormats.hs new file mode 100644 --- /dev/null +++ b/src/Text/IntFormats.hs @@ -0,0 +1,131 @@ +{-# LANGUAGE FlexibleContexts #-} +-- |Includes functions for converting from a string to an integer, with the base determined automatically, +-- and from an integer to a string, with the user specifying the base. Supports negative numbers. +-- +-- For examples, see the [test source](https://github.com/LyraSolomon/IntFormats/tree/master/test/Text/IntFormatsSpec.hs) +-- +-- @'parseInt' . 'showInt' True _ == Right@ for all inputs, however the reverse is not necessarily true, even in the case of +-- valid input, since 'parseInt' accepts some rather creative capitalization that 'showInt' does not produce. +module Text.IntFormats (IntFormat(..), parseInt, intParser, showInt) where + +import Text.Parsec hiding (digit) +import Text.Parsec.Char (alphaNum) +import Data.Char (toUpper) +import Data.List (foldl1') +import Test.QuickCheck (Arbitrary, arbitrary, oneof) + +-- |'IntFormat' specifies which base is used for 'showInt' +data IntFormat = + -- |@0d99@, etc. This will be more commonly used without the prefix. + Decimal | + -- |Hexadecimal with lowercase digits, such as @0xff@ + Hexadecimal | + -- |@0o77@, etc. In some programs, octal is denoted with a leading zero, however that is not used here. + Octal | + -- |@0b11@, etc. + Binary | + -- |Hexadecimal with uppercase digits. This only affects the digits A-F, not the prefix. For example, @0xFF@ + HexUpper deriving (Show, Eq) + +-- |The same as 'parseInt', except the parsec monad isn't evaluated. This is intended for use as part of +-- a larger parser. If you simply want to get a value, use 'parseInt' +intParser :: (Integral a, Stream s m Char) => ParsecT s u m a +intParser = do + negative <- option ' ' (char '-') + value <- (char '0' >> parseBase) <|> parseDec + notFollowedBy (alphaNum <|> char '.') + if negative == '-' then return (-value) else return value + +-- |Converts a string to an integer if able, otherwise returns an error message. +-- The number may begin with @0x@, @0d@, @0o@, or @0b@ to specify the numerical base. If no prefix is provided, base 10 is assumed. +-- The prefix is case insensitive. If the number is negative, the sign goes in front of the prefix. The number must +-- not have leading spaces. The number may have characters following it, as long as it is not immediately followed by +-- a digit, a letter, or a decimal point. +parseInt :: Integral a => String -> Either String a +parseInt = mapLeft show . parse intParser "" + +parseBase :: (Integral a, Stream s m Char) => ParsecT s u m a +parseBase = (char 'x' >> parseHex) <|> (char 'o' >> parseOct) <|> (char 'b' >> parseBin) <|> (char 'd' >> parseDec) <|> + (char 'X' >> parseHex) <|> (char 'O' >> parseOct) <|> (char 'B' >> parseBin) <|> (char 'D' >> parseDec) <|> parseDec <|> return 0 + +-- |Converts a integer to a string, with the chosen numerical base. +showInt :: Integral a + => Bool -- ^ Whether to include the prefix @0x@, @0d@, @0o@, or @0b@. A value of True is generally recommended for bases other than decimal. + -> IntFormat -- ^ Which numerical base to use, and if it is hexadecimal, whether the digits are uppercase or lowercase + -> a -- ^ The number to be converted + -> String -- ^ The output value. +showInt prefix base n = if n < 0 then '-' : showInt' base (-n) else showInt' base n + where showInt' Decimal = (if prefix then ("0d"++) else id) . digits 10 + showInt' Hexadecimal = (if prefix then ("0x"++) else id) . digits 16 + showInt' HexUpper = (if prefix then ("0x"++) else id) . map toUpper . digits 16 + showInt' Octal = (if prefix then ("0o"++) else id) . digits 8 + showInt' Binary = (if prefix then ("0b"++) else id) . digits 2 + +undigits :: Integral a => a -> String -> a +undigits n = foldl1' (\a b -> a*n+b) . map undigit + +digits :: Integral a => a -> a -> String +digits n x = if x `div` n == 0 then [digit x] else digits n (x `div` n) ++ [digit (x `mod` n)] + +parseDec :: (Integral a, Stream s m Char) => ParsecT s u m a +parseDec = undigits 10 <$> many1 (oneOf "1234567890") "one or more decimal digits" + +parseHex :: (Integral a, Stream s m Char) => ParsecT s u m a +parseHex = undigits 16 <$> many1 (oneOf "1234567890abcdefABCDEF") "one or more dexadecimal digits" + +parseOct :: (Integral a, Stream s m Char) => ParsecT s u m a +parseOct = undigits 8 <$> many1 (oneOf "12345670") "one or more octal digits" + +parseBin :: (Integral a, Stream s m Char) => ParsecT s u m a +parseBin = undigits 2 <$> many1 (oneOf "01") "one or more binary undigits" + +undigit :: Integral a => Char -> a +undigit '0' = 0 +undigit '1' = 1 +undigit '2' = 2 +undigit '3' = 3 +undigit '4' = 4 +undigit '5' = 5 +undigit '6' = 6 +undigit '7' = 7 +undigit '8' = 8 +undigit '9' = 9 +undigit 'a' = 10 +undigit 'b' = 11 +undigit 'c' = 12 +undigit 'd' = 13 +undigit 'e' = 14 +undigit 'f' = 15 +undigit 'A' = 10 +undigit 'B' = 11 +undigit 'C' = 12 +undigit 'D' = 13 +undigit 'E' = 14 +undigit 'F' = 15 +undigit _ = undefined + +digit :: Integral a => a -> Char +digit 0 = '0' +digit 1 = '1' +digit 2 = '2' +digit 3 = '3' +digit 4 = '4' +digit 5 = '5' +digit 6 = '6' +digit 7 = '7' +digit 8 = '8' +digit 9 = '9' +digit 10 = 'a' +digit 11 = 'b' +digit 12 = 'c' +digit 13 = 'd' +digit 14 = 'e' +digit 15 = 'f' +digit _ = undefined + +instance Arbitrary IntFormat where + arbitrary = oneof $ map return [Hexadecimal, HexUpper, Decimal, Octal, Binary] + +mapLeft :: (a -> b) -> Either a c -> Either b c +mapLeft f (Left x) = Left $ f x +mapLeft _ (Right x) = Right x diff --git a/test/Spec.hs b/test/Spec.hs new file mode 100644 --- /dev/null +++ b/test/Spec.hs @@ -0,0 +1,1 @@ +{-# OPTIONS_GHC -F -pgmF hspec-discover #-} diff --git a/test/Text/IntFormatsSpec.hs b/test/Text/IntFormatsSpec.hs new file mode 100644 --- /dev/null +++ b/test/Text/IntFormatsSpec.hs @@ -0,0 +1,100 @@ +module Text.IntFormatsSpec (spec) where + +import Data.Char (isAlpha, isDigit) +import Test.Hspec +import Text.Read (readEither) +import Test.QuickCheck + +import Text.IntFormats + +showInt' :: Bool -> IntFormat -> Int -> String +showInt' = showInt + +parseInt' :: String -> Either String Int +parseInt' = parseInt + +spec :: Spec +spec = do + describe "showInt" $ do + it "separates digits in base 16" $ + showInt' False Hexadecimal 0x98765430 `shouldBe` "98765430" + it "prints digits >9 in lowercase" $ + showInt' True Hexadecimal 0xafbecd `shouldBe` "0xafbecd" + it "prints digits >9 in uppercase" $ + showInt' True HexUpper 0xafbecd `shouldBe` "0xAFBECD" + it "only uses uppercase when needed" $ + showInt' False HexUpper 0x400 `shouldBe` "400" + it "separates digits in base 10" $ + showInt' False Decimal 1234567890 `shouldBe` "1234567890" + it "has correct decimal prefix" $ + showInt' True Decimal 321 `shouldBe` "0d321" + it "separates digits in base 8" $ + showInt' False Octal 0o72546310 `shouldBe` "72546310" + it "has correct octal prefix" $ + showInt' True Octal 0o1234 `shouldBe` "0o1234" + it "separates digits in base 2" $ + showInt' False Binary 1000 `shouldBe` "1111101000" + it "has correct binary prefix" $ + showInt' True Binary 100 `shouldBe` "0b1100100" + it "extends show" $ property $ + equivalentFuncs (showInt' False Decimal) show + it "works with negative numbers" $ property $ + \(p, m, n) -> showInt' p m (-(abs n)) === (if n == 0 then "" else "-") ++ showInt' p m (abs n) + it "shows zero" $ + showInt' False Decimal 0 `shouldBe` "0" + describe "parseInt" $ do + it "hexadecimal with lowercase prefix" $ + parseInt' "0xaBcDEf01" `shouldBe` Right 0xabcdef01 + it "hexadecimal with uppercase prefix" $ + parseInt' "0X29876FF3" `shouldBe` Right 0x29876ff3 + it "decimal with lowercase prefix" $ + parseInt' "0d9087654321" `shouldBe` Right 9087654321 + it "decimal with uppercase prefix" $ + parseInt' "0D12345" `shouldBe` Right 12345 + it "octal with lowercase prefix" $ + parseInt' "0o71062543" `shouldBe` Right 0o71062543 + it "octal with uppercase prefix" $ + parseInt' "0O11111" `shouldBe` Right 0o11111 + it "binary with lowercase prefix" $ + parseInt' "0b1110" `shouldBe` Right 14 + it "binary with uppercase prefix" $ + parseInt' "0B101010" `shouldBe` Right 42 + it "zero with prefix" $ + parseInt' "0b0" `shouldBe` Right 0 + it "inverts showInt" $ property $ + \(m, n) -> (parseInt' . showInt True m) (abs n) === Right (abs n) + it "extends read" $ property $ + \s -> parseInt' s `equalRight` readEither s + it "zero without prefix" $ + parseInt' "0" `shouldBe` Right 0 + it "doesn't require prefix for base 10" $ property $ + equivalentFuncs (parseInt' . show . abs) (Right . abs) + it "fails on leading alphabetical characters" $ property $ + null . parseInt' . filter isAlpha + it "fails on empty string" $ + parseInt' "" `shouldSatisfy` null + it "fails on 8 or 9 in octal" $ property $ + \n -> '8' `elem` show (abs n) || '9' `elem` show (abs n) ==> (null . parseInt') ("0o" ++ show (abs n :: Int)) + it "accepts leading zeros" $ property $ + \(n, m) -> m `mod` 5 /= 0 ==> Right (abs n) === parseInt' (replicate (m `mod` 5) '0' ++ show (abs n)) + it "fails on 2 to 9 in binary" $ property $ + \n -> length (show (abs n)) /= length (filter (\x->x=='0'||x=='1') (show (abs n))) ==> (null . parseInt') ("0b" ++ show (abs n :: Int)) + it "fails on a to f in decimal" $ property $ + \n -> length (showInt' False Hexadecimal (abs n)) /= length (filter isDigit (showInt' False Hexadecimal (abs n))) ==> + (null . parseInt') (showInt False Hexadecimal (abs n)) + it "fails on trailing '.'" $ + parseInt' "12." `shouldSatisfy` null + it "stops at separator" $ + parseInt' "12 34" `shouldBe` Right 12 + it "fails on invalid prefix" $ property $ + \c -> isAlpha c && c `notElem` "xdobXDOB" ==> null (parseInt' (c:"100")) + it "works with negative numbers" $ property $ + \n b -> equivalentFuncs (parseInt' . ('-':) . showInt' True b . abs) (Right . (0-) . abs) n + +equivalentFuncs :: (Eq b, Show b) => (a -> b) -> (a -> b) -> a -> Property +equivalentFuncs = (.) (<*>) $ (<$>) (===) + +equalRight :: (Eq a, Show a) => Either t a -> Either s a -> Bool +equalRight (Left _) _ = True +equalRight _ (Left _) = True +equalRight (Right a) (Right b) = a == b