ghcup-hs/3rdparty/os-release/tests/Specs/Megaparsec.hs

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2020-07-04 21:28:30 +00:00
module Specs.Megaparsec where
import System.OsRelease
import Data.Either
import Data.Void
import Test.Hspec
import Test.Hspec.Megaparsec
import qualified Text.Megaparsec as MP
megaparsecSpec :: Spec
megaparsecSpec = do
describe "parseAssignment" $ do
it "parses simple value" $ shouldParse' "foo=bar" ("foo", "bar")
it "parses single quoted value" $ shouldParse' "foo='bar'" ("foo", "bar")
it "parses double quoted value" $ shouldParse' "foo=\"bar\"" ("foo", "bar")
it "parses _ var" $ shouldParse' "f_x=''" ("f_x", "")
-- this is not valid per spec, but many files do this
it "parses ._- in unquoted assignment"
$ shouldParse' "VERSION_ID=bar-1.9_rc2" ("VERSION_ID", "bar-1.9_rc2")
it "parses quoted space" $ shouldParse' "f='a b'" ("f", "a b")
it "parses quoted -" $ shouldParse' "f='a-b'" ("f", "a-b")
it "parses special \\" $ shouldParse' "foo='ba\\\\r'" ("foo", "ba\\r")
it "parses special `" $ shouldParse' "foo='ba\\`r'" ("foo", "ba`r")
it "parses special '" $ shouldParse' "foo='ba\\'r'" ("foo", "ba'r")
it "parses special $" $ shouldParse' "foo='ba\\$r'" ("foo", "ba$r")
it "parses special \"" $ shouldParse' "foo=\"ba\\\"r\"" ("foo", "ba\"r")
it "parses empty val noquotes" $ shouldParse' "foo=" ("foo", "")
it "parses empty val quote \"" $ shouldParse' "foo=\"\"" ("foo", "")
it "parses empty val quote '" $ shouldParse' "foo=''" ("foo", "")
it "breaks on comments" $ shouldFail' "# foo=\"bar'"
it "breaks on misquoting 1" $ shouldFail' "foo=\"bar'"
it "breaks on misquoting 2" $ shouldFail' "foo='bar\""
it "breaks on unquoted $" $ shouldFail' "foo='ba$r'"
it "breaks on unquoted `" $ shouldFail' "foo='ba`r'"
it "breaks on unquoted \"" $ shouldFail' "foo=\"ba\"r\""
it "breaks on unquoted '" $ shouldFail' "foo='ba'r'"
it "breaks on unquoted \\" $ shouldFail' "foo='ba\\r'"
it "breaks on unquoted val with space" $ shouldFail' "foo=ba r"
it "breaks on unquoted val with ;" $ shouldFail' "foo=ba;r"
it "breaks on unquoted val with \\" $ shouldFail' "foo=ba\\r"
it "breaks on trailing NL" $ shouldFail' "foo=bar\n"
describe "parseAssignments" $ do
it "parses simple values" $ shouldParseMany "foo=bar" [("foo", "bar")]
it "parses multiple values"
$ shouldParseMany "foo=bar\nbar=baz" [("foo", "bar"), ("bar", "baz")]
it "parses multiple values with comments" $ shouldParseMany
"foo=bar\n# comment\nbar=baz"
[("foo", "bar"), ("bar", "baz")]
it "parses gracefully" $ shouldParseMany "foo=bar\nbar=baz\"" [("foo", "bar")]
it "parses empty files" $ shouldParseMany "" []
it "parses empty files with newlines" $ shouldParseMany "\n\n" []
it "parses empty files with newlines and comments"
$ shouldParseMany "\n\n#\n" []
it "parses comments with leading spaces" $ shouldParseMany " #" []
parse :: String -> Either (MP.ParseErrorBundle String Void) (String, String)
parse = MP.parse (parseAssignment <* MP.eof) ""
shouldParse' :: String -> (String, String) -> Expectation
shouldParse' s s' = parse s `shouldParse` s'
shouldFail' :: String -> Expectation
shouldFail' s = parse `shouldFailOn` s
parseMany :: String
-> Either (MP.ParseErrorBundle String Void) [(String, String)]
parseMany = fmap rights . MP.parse parseAssignments ""
shouldParseMany :: String -> [(String, String)] -> Expectation
shouldParseMany s s' = parseMany s `shouldParse` s'
shouldFailMany :: String -> Expectation
shouldFailMany s = parseMany `shouldFailOn` s