Salve.Internal

WARNING: This module should be considered private! If you find yourself wanting to import something from this module, please open an issue to get that thing exported from Salve.

Documentation

>>> import Lens.Micro
>>> import Lens.Micro.Extras

Public

data Version

A semantic version number. Versions have five parts:

1. majorLens: The major version number.
2. minorLens: The minor version number.
3. patchLens: The patch version number.
4. preReleasesLens: A list of pre-release identifiers.
5. buildsLens: A list of build metadata.

Use parseVersion to create versions.

Constructors

Version

Fields

• versionMajor :: Word
• versionMinor :: Word
• versionPatch :: Word
• versionPreReleases :: [PreRelease]
• versionBuilds :: [Build]

Instances

Eq Version

Methods

(==) :: Version -> Version -> Bool

(/=) :: Version -> Version -> Bool

Ord Version

In general, Versions compare in the way that you would expect. First the major version numbers are compared, then the minors, then the patches.

>>> compare <$> parseVersion "1.2.3" <*> parseVersion "2.0.0"
Just LT
>>> compare <$> parseVersion "1.2.3" <*> parseVersion "1.3.0"
Just LT
>>> compare <$> parseVersion "1.2.3" <*> parseVersion "1.2.4"
Just LT

Numbers are compared numerically, not alphabetically.

>>> compare <$> parseVersion "0.0.9" <*> parseVersion "0.0.10"
Just LT

If all the numbers are the same, the pre-releases are compared.

>>> compare <$> parseVersion "1.2.3-a" <*> parseVersion "1.2.3-b"
Just LT

A version with a pre-release is always less than a version without one as long as the other parts are the same.

>>> compare <$> parseVersion "1.2.3-pre" <*> parseVersion "1.2.3"
Just LT
>>> compare <$> parseVersion "1.2.4-pre" <*> parseVersion "1.2.3"
Just GT

Builds are not considered when comparing versions.

>>> compare <$> parseVersion "1.2.3+a" <*> parseVersion "1.2.3+b"
Just EQ
>>> (==) <$> parseVersion "1.2.3+a" <*> parseVersion "1.2.3+b"
Just False

Methods

compare :: Version -> Version -> Ordering

(<) :: Version -> Version -> Bool

(<=) :: Version -> Version -> Bool

(>) :: Version -> Version -> Bool

(>=) :: Version -> Version -> Bool

max :: Version -> Version -> Version

min :: Version -> Version -> Version

Show Version

Methods

showsPrec :: Int -> Version -> ShowS

show :: Version -> String

showList :: [Version] -> ShowS

data PreRelease

Pre-release information attached to a version. These can either be numeric or textual. They must not be empty.

• Numeric: Can be any non-negative integer. Cannot have leading zeros.
• Textual: Can be any string of ASCII digits, letters, or hyphens. Cannot be all digits, as that would be numeric.

In general, pre-releases must match the regular expression /^[-0-9A-Za-z]+$/.

Use parsePreRelease to create pre-releases.

Constructors

PreReleaseNumeric Word

PreReleaseTextual String

Instances

Eq PreRelease

Methods

(==) :: PreRelease -> PreRelease -> Bool

(/=) :: PreRelease -> PreRelease -> Bool

Ord PreRelease

Numeric pre-releases are always less than textual pre-releases.

>>> compare <$> parsePreRelease "1" <*> parsePreRelease "a"
Just LT

Numeric pre-releases are compared numerically.

>>> compare <$> parsePreRelease "9" <*> parsePreRelease "10"
Just LT

Textual pre-releases are compared alphabetically.

>>> compare <$> parsePreRelease "p10" <*> parsePreRelease "p9"
Just LT

Methods

compare :: PreRelease -> PreRelease -> Ordering

(<) :: PreRelease -> PreRelease -> Bool

(<=) :: PreRelease -> PreRelease -> Bool

(>) :: PreRelease -> PreRelease -> Bool

(>=) :: PreRelease -> PreRelease -> Bool

max :: PreRelease -> PreRelease -> PreRelease

min :: PreRelease -> PreRelease -> PreRelease

Show PreRelease

Methods

showsPrec :: Int -> PreRelease -> ShowS

show :: PreRelease -> String

showList :: [PreRelease] -> ShowS

newtype Build

Build metadata attached to a version. These are similar to PreReleases with some key differences:

1. There is no such thing as numeric builds. Even though builds can look like numbers, all builds are textual.
2. As a result, builds that look numeric are allowed to have leading zeros.
3. Builds cannot be compared. That is, they do not have an Ord instance.

Use parseBuild to create builds.

Constructors

Build String

Instances

Eq Build

Methods

(==) :: Build -> Build -> Bool

(/=) :: Build -> Build -> Bool

Show Build

Methods

showsPrec :: Int -> Build -> ShowS

show :: Build -> String

showList :: [Build] -> ShowS

data Constraint

Constrains allowable version numbers.

Use parseConstraint to create constraints and satisfies to see if a version number satisfies a constraint.

Constructors

ConstraintOperator Operator Version

ConstraintHyphen Version Version

ConstraintAnd Constraint Constraint

ConstraintOr Constraint Constraint

Instances

Eq Constraint

Methods

(==) :: Constraint -> Constraint -> Bool

(/=) :: Constraint -> Constraint -> Bool

Show Constraint

Methods

showsPrec :: Int -> Constraint -> ShowS

show :: Constraint -> String

showList :: [Constraint] -> ShowS

makeVersion :: Word -> Word -> Word -> [PreRelease] -> [Build] -> Version

Makes a new version number.

>>> makeVersion 0 0 0 [] []
Version {versionMajor = 0, versionMinor = 0, versionPatch = 0, versionPreReleases = [], versionBuilds = []}

This can be a useful alternative to parseVersion if you want a total way to create a version.

initialVersion :: Version

The initial version number for development.

>>> initialVersion
Version {versionMajor = 0, versionMinor = 0, versionPatch = 0, versionPreReleases = [], versionBuilds = []}

constraintLT :: Version -> Constraint

Makes a new constraint that must be less than the version number.

>>> constraintLT <$> parseVersion "1.2.3"
Just (ConstraintOperator OperatorLT (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))
>>> parseConstraint "<1.2.3"
Just (ConstraintOperator OperatorLT (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))

constraintLE :: Version -> Constraint

Makes a new constraint that must be less than or euqal to the version number.

>>> constraintLE <$> parseVersion "1.2.3"
Just (ConstraintOperator OperatorLE (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))
>>> parseConstraint "<=1.2.3"
Just (ConstraintOperator OperatorLE (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))

constraintEQ :: Version -> Constraint

Makes a new constraint that must be equal to the version number.

>>> constraintEQ <$> parseVersion "1.2.3"
Just (ConstraintOperator OperatorEQ (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))
>>> parseConstraint "=1.2.3"
Just (ConstraintOperator OperatorEQ (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))

constraintGE :: Version -> Constraint

Makes a new constraint that must be greater than or equal to the version number.

>>> constraintGE <$> parseVersion "1.2.3"
Just (ConstraintOperator OperatorGE (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))
>>> parseConstraint ">=1.2.3"
Just (ConstraintOperator OperatorGE (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))

constraintGT :: Version -> Constraint

Makes a new constraint that must be greater than the version number.

>>> constraintGT <$> parseVersion "1.2.3"
Just (ConstraintOperator OperatorGT (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))
>>> parseConstraint ">1.2.3"
Just (ConstraintOperator OperatorGT (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))

constraintAnd :: Constraint -> Constraint -> Constraint

Makes a new constraint that must satisfy both constraints.

>>> constraintAnd <$> (constraintGE <$> parseVersion "1.2.3") <*> (constraintLT <$> parseVersion "2.0.0")
Just (ConstraintAnd (ConstraintOperator OperatorGE (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []})) (ConstraintOperator OperatorLT (Version {versionMajor = 2, versionMinor = 0, versionPatch = 0, versionPreReleases = [], versionBuilds = []})))
>>> parseConstraint ">=1.2.3 <2.0.0"
Just (ConstraintAnd (ConstraintOperator OperatorGE (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []})) (ConstraintOperator OperatorLT (Version {versionMajor = 2, versionMinor = 0, versionPatch = 0, versionPreReleases = [], versionBuilds = []})))

constraintOr :: Constraint -> Constraint -> Constraint

Makes a new constraint that must satisfy either constraint.

>>> constraintOr <$> (constraintEQ <$> parseVersion "1.2.3") <*> (constraintGT <$> parseVersion "1.2.3")
Just (ConstraintOr (ConstraintOperator OperatorEQ (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []})) (ConstraintOperator OperatorGT (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []})))
>>> parseConstraint "=1.2.3 || >1.2.3"
Just (ConstraintOr (ConstraintOperator OperatorEQ (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []})) (ConstraintOperator OperatorGT (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []})))

constraintHyphen :: Version -> Version -> Constraint

Makes a new constraint that must be between the versions, inclusive.

>>> constraintHyphen <$> parseVersion "1.2.3" <*> parseVersion "2.3.4"
Just (ConstraintHyphen (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}) (Version {versionMajor = 2, versionMinor = 3, versionPatch = 4, versionPreReleases = [], versionBuilds = []}))
>>> parseConstraint "1.2.3 - 2.3.4"
Just (ConstraintHyphen (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}) (Version {versionMajor = 2, versionMinor = 3, versionPatch = 4, versionPreReleases = [], versionBuilds = []}))

constraintTilde :: Version -> Constraint

Makes a new constraint that allows changes to the patch version number.

>>> constraintTilde <$> parseVersion "1.2.3"
Just (ConstraintOperator OperatorTilde (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))
>>> parseConstraint "~1.2.3"
Just (ConstraintOperator OperatorTilde (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))

constraintCaret :: Version -> Constraint

Makes a new constraint that allows changes that do not modify the left-most non-zero version number.

>>> constraintCaret <$> parseVersion "1.2.3"
Just (ConstraintOperator OperatorCaret (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))
>>> parseConstraint "^1.2.3"
Just (ConstraintOperator OperatorCaret (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))

parseVersion :: String -> Maybe Version

Attempts to parse a version. This parser follows SemVer's BNF.

>>> parseVersion "1.2.3-p.4+b.5"
Just (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [PreReleaseTextual "p",PreReleaseNumeric 4], versionBuilds = [Build "b",Build "5"]})

Returns Nothing if the parse fails.

>>> parseVersion "wrong"
Nothing

Whitespace is not allowed and will cause the parser to fail.

>>> parseVersion " 1.2.3 "
Nothing

parsePreRelease :: String -> Maybe PreRelease

Attempts to parse a pre-release.

>>> parsePreRelease "pre"
Just (PreReleaseTextual "pre")
>>> parsePreRelease "1"
Just (PreReleaseNumeric 1)

Returns Nothing if the parse fails.

>>> parsePreRelease "wrong!"
Nothing

Numeric pre-releases cannot contain leading zeros.

>>> parsePreRelease "01"
Nothing

parseBuild :: String -> Maybe Build

Attempts to parse a build.

>>> parseBuild "build"
Just (Build "build")
>>> parseBuild "1"
Just (Build "1")

Returns Nothing if the parse fails.

>>> parseBuild "wrong!"
Nothing

Unlike pre-releases, numeric builds can have leading zeros.

>>> parseBuild "01"
Just (Build "01")

parseConstraint :: String -> Maybe Constraint

Attempts to parse a constraint. This parser follows npm's BNF, except that neither the so-called "x-ranges" nor partial version numbers are not supported. So you cannot use 1.2.x or >1.2 as version constraints.

>>> parseConstraint ">1.2.3"
Just (ConstraintOperator OperatorGT (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []}))

Returns Nothing if the parse fails.

>>> parseConstraint "wrong"
Nothing

unsafeParseVersion :: String -> Version

Parses a version.

>>> unsafeParseVersion "1.2.3-p.4+b.5"
Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [PreReleaseTextual "p",PreReleaseNumeric 4], versionBuilds = [Build "b",Build "5"]}

Raises an exception if the parse fails.

>>> unsafeParseVersion "wrong"
*** Exception: unsafeParseVersion: invalid version: "wrong"
...

See parseVersion for a safe version of this function.

unsafeParsePreRelease :: String -> PreRelease

Parses a pre-release.

>>> unsafeParsePreRelease "pre"
PreReleaseTextual "pre"

Raises an exception if the parse fails.

>>> unsafeParsePreRelease "wrong!"
*** Exception: unsafeParsePreRelease: invalid pre-release: "wrong!"
...

See parsePreRelease for a safe version of this function.

unsafeParseBuild :: String -> Build

Parses a build.

>>> unsafeParseBuild "build"
Build "build"

Raises an exception if the parse fails.

>>> unsafeParseBuild "wrong!"
Build "*** Exception: unsafeParseBuild: invalid build: "wrong!"
...

See parseBuild for a safe version of this function.

unsafeParseConstraint :: String -> Constraint

Parses a constraint.

>>> unsafeParseConstraint ">1.2.3"
ConstraintOperator OperatorGT (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []})

Raises an exception if the parse fails.

>>> unsafeParseConstraint "wrong"
*** Exception: unsafeParseConstraint: invalid constraint: "wrong"
...

See parseConstraint for a safe version of this function.

renderVersion :: Version -> String

Renders a version.

>>> renderVersion <$> parseVersion "1.2.3-p.4+b.5"
Just "1.2.3-p.4+b.5"

renderPreRelease :: PreRelease -> String

Renders a pre-release.

>>> renderPreRelease <$> parsePreRelease "pre"
Just "pre"
>>> renderPreRelease <$> parsePreRelease "1"
Just "1"

renderBuild :: Build -> String

Renders a build.

>>> renderBuild <$> parseBuild "build"
Just "build"
>>> renderBuild <$> parseBuild "1"
Just "1"

renderConstraint :: Constraint -> String

Renders a constraint.

>>> renderConstraint <$> parseConstraint ">1.2.3"
Just ">1.2.3"

Parsing and rendering a constraint doesn't always return what you started with.

>>> renderConstraint <$> parseConstraint "=1.2.3"
Just "1.2.3"

isUnstable :: Version -> Bool

Returns True if the major version number is zero, False otherwise.

>>> isUnstable <$> parseVersion "0.1.2"
Just True
>>> isUnstable <$> parseVersion "1.0.0"
Just False

isStable :: Version -> Bool

Returns True if the major version number is not zero, False otherwise.

>>> isStable <$> parseVersion "1.0.0"
Just True
>>> isStable <$> parseVersion "0.1.2"
Just False

bumpMajor :: Version -> Version

Increments the major version number.

>>> bumpMajor <$> parseVersion "0.0.0"
Just (Version {versionMajor = 1, versionMinor = 0, versionPatch = 0, versionPreReleases = [], versionBuilds = []})

The minor and patch numbers are reset to zero.

>>> bumpMajor <$> parseVersion "1.2.3"
Just (Version {versionMajor = 2, versionMinor = 0, versionPatch = 0, versionPreReleases = [], versionBuilds = []})

The pre-releases and builds are removed.

>>> bumpMajor <$> parseVersion "0.0.0-pre+build"
Just (Version {versionMajor = 1, versionMinor = 0, versionPatch = 0, versionPreReleases = [], versionBuilds = []})

Consider using majorLens if you want to arbitrarily change the major number, or if you don't want the other parts of the version to change.

bumpMinor :: Version -> Version

Increments the minor version number.

>>> bumpMinor <$> parseVersion "0.0.0"
Just (Version {versionMajor = 0, versionMinor = 1, versionPatch = 0, versionPreReleases = [], versionBuilds = []})

The patch number is reset to zero.

>>> bumpMinor <$> parseVersion "1.2.3"
Just (Version {versionMajor = 1, versionMinor = 3, versionPatch = 0, versionPreReleases = [], versionBuilds = []})

The pre-releases and builds are removed.

>>> bumpMinor <$> parseVersion "0.0.0-pre+build"
Just (Version {versionMajor = 0, versionMinor = 1, versionPatch = 0, versionPreReleases = [], versionBuilds = []})

Consider using minorLens if you want to arbitrarily change the minor number, or if you don't want the other parts of the version to change.

bumpPatch :: Version -> Version

Increments the patch number.

>>> bumpPatch <$> parseVersion "0.0.0"
Just (Version {versionMajor = 0, versionMinor = 0, versionPatch = 1, versionPreReleases = [], versionBuilds = []})

The major and minor numbers are not changed.

>>> bumpPatch <$> parseVersion "1.2.3"
Just (Version {versionMajor = 1, versionMinor = 2, versionPatch = 4, versionPreReleases = [], versionBuilds = []})

The pre-releases and builds are removed.

>>> bumpPatch <$> parseVersion "0.0.0-pre+build"
Just (Version {versionMajor = 0, versionMinor = 0, versionPatch = 1, versionPreReleases = [], versionBuilds = []})

Consider using patchLens if you want to arbitrarily change the patch number, or if you don't want the other parts of the version to change.

satisfies :: Version -> Constraint -> Bool

Returns True if the version satisfies the constraint, False otherwise.

>>> satisfies <$> parseVersion "1.2.3" <*> parseConstraint ">1.2.0"
Just True

majorLens :: Functor f => (Word -> f Word) -> Version -> f Version

Focuses on the major version number.

>>> view majorLens <$> parseVersion "1.2.3-pre.4+build.5"
Just 1
>>> set majorLens 4 <$> parseVersion "1.2.3"
Just (Version {versionMajor = 4, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []})

minorLens :: Functor f => (Word -> f Word) -> Version -> f Version

Focuses on the minor version number.

>>> view minorLens <$> parseVersion "1.2.3-pre.4+build.5"
Just 2
>>> set minorLens 4 <$> parseVersion "1.2.3"
Just (Version {versionMajor = 1, versionMinor = 4, versionPatch = 3, versionPreReleases = [], versionBuilds = []})

patchLens :: Functor f => (Word -> f Word) -> Version -> f Version

Focuses on the patch version number.

>>> view patchLens <$> parseVersion "1.2.3-pre.4+build.5"
Just 3
>>> set patchLens 4 <$> parseVersion "1.2.3"
Just (Version {versionMajor = 1, versionMinor = 2, versionPatch = 4, versionPreReleases = [], versionBuilds = []})

preReleasesLens :: Functor f => ([PreRelease] -> f [PreRelease]) -> Version -> f Version

Focuses on the pre-release identifiers.

>>> view preReleasesLens <$> parseVersion "1.2.3-pre.4+build.5"
Just [PreReleaseTextual "pre",PreReleaseNumeric 4]
>>> set preReleasesLens [] <$> parseVersion "1.2.3-pre"
Just (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []})

buildsLens :: Functor f => ([Build] -> f [Build]) -> Version -> f Version

Focuses on the build metadata.

>>> view buildsLens <$> parseVersion "1.2.3-pre.4+build.5"
Just [Build "build",Build "5"]
>>> set buildsLens [] <$> parseVersion "1.2.3+build"
Just (Version {versionMajor = 1, versionMinor = 2, versionPatch = 3, versionPreReleases = [], versionBuilds = []})

Private

Types

data Operator

Constructors

OperatorLT

OperatorLE

OperatorEQ

OperatorGE

OperatorGT

OperatorTilde

OperatorCaret

Instances

Eq Operator

Methods

(==) :: Operator -> Operator -> Bool

(/=) :: Operator -> Operator -> Bool

Show Operator

Methods

showsPrec :: Int -> Operator -> ShowS

show :: Operator -> String

showList :: [Operator] -> ShowS

Parsing

versionP :: Parser Version

preReleasesP :: Parser [PreRelease]

preReleaseP :: Parser PreRelease

preReleaseNumberP :: Parser PreRelease

preReleaseStringP :: Parser PreRelease

buildsP :: Parser [Build]

buildP :: Parser Build

numberP :: Parser Word

zeroP :: Parser Word

nonZeroP :: Parser Word

constraintsP :: Parser Constraint

constraintP :: Parser Constraint

hyphenatedP :: Parser Constraint

simpleP :: Parser Constraint

caretP :: Parser Constraint

tildeP :: Parser Constraint

primitiveP :: Parser Constraint

operatorP :: Parser Operator

leP :: Parser Operator

geP :: Parser Operator

ltP :: Parser Operator

gtP :: Parser Operator

eqP :: Parser Operator

hyphenP :: Parser String

orP :: Parser String

spaceP :: Parser Char

Helpers

parse :: Parser a -> String -> Maybe a

newtype Parser a

Constructors

Parser

Fields

• runParser :: String -> [(a, String)]

Instances

Monad Parser

Methods

(>>=) :: Parser a -> (a -> Parser b) -> Parser b

(>>) :: Parser a -> Parser b -> Parser b

return :: a -> Parser a

fail :: String -> Parser a

Functor Parser

Methods

fmap :: (a -> b) -> Parser a -> Parser b

(<$) :: a -> Parser b -> Parser a

Applicative Parser

Methods

pure :: a -> Parser a

(<*>) :: Parser (a -> b) -> Parser a -> Parser b

(*>) :: Parser a -> Parser b -> Parser b

(<*) :: Parser a -> Parser b -> Parser a

charP :: Char -> Parser Char

choiceP :: Parser a -> Parser a -> Parser a

failP :: Parser a

getP :: Parser Char

manyP :: Parser a -> Parser [a]

oneOfP :: [Parser a] -> Parser a

optionP :: a -> Parser a -> Parser a

satisfyP :: (Char -> Bool) -> Parser Char

sepByP :: Parser b -> Parser a -> Parser [a]

sepBy1P :: Parser b -> Parser a -> Parser [a]

someP :: Parser a -> Parser [a]

stringP :: String -> Parser String

Rendering

renderPreReleases :: [PreRelease] -> String

renderBuilds :: [Build] -> String

Helpers

both :: (a -> b) -> (a, a) -> (b, b)

comparing :: Ord b => (a -> b) -> a -> a -> Ordering

isAsciiAlpha :: Char -> Bool

isAsciiAlphaLower :: Char -> Bool

isAsciiAlphaUpper :: Char -> Bool

isAsciiDigit :: Char -> Bool

isAsciiDigitNonZero :: Char -> Bool

isIdentifier :: Char -> Bool

join :: Char -> [String] -> String

safeHead :: [a] -> Maybe a