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{-# LANGUAGE OverloadedStrings #-}
-- | This module defines a printer for the @GraphQL@ language.
module Data.GraphQL.Encoder where
import Data.Monoid ((<>))
import Data.Text (Text, cons, intercalate, pack, snoc)
import Data.GraphQL.AST
-- * Document
-- TODO: Use query shorthand
document :: Document -> Text
document (Document defs) = (`snoc` '\n') . mconcat $ definition <$> defs
definition :: Definition -> Text
definition (DefinitionOperation x) = operationDefinition x
definition (DefinitionFragment x) = fragmentDefinition x
operationDefinition :: OperationDefinition -> Text
operationDefinition (Query n) = "query " <> node n
operationDefinition (Mutation n) = "mutation " <> node n
node :: Node -> Text
node (Node name vds ds ss) =
name
<> optempty variableDefinitions vds
<> optempty directives ds
<> selectionSet ss
variableDefinitions :: [VariableDefinition] -> Text
variableDefinitions = parensCommas variableDefinition
variableDefinition :: VariableDefinition -> Text
variableDefinition (VariableDefinition var ty dv) =
variable var <> ":" <> type_ ty <> maybe mempty defaultValue dv
defaultValue :: DefaultValue -> Text
defaultValue val = "=" <> value val
variable :: Variable -> Text
variable (Variable name) = "$" <> name
selectionSet :: SelectionSet -> Text
selectionSet = bracesCommas selection
selection :: Selection -> Text
selection (SelectionField x) = field x
selection (SelectionInlineFragment x) = inlineFragment x
selection (SelectionFragmentSpread x) = fragmentSpread x
field :: Field -> Text
field (Field alias name args ds ss) =
optempty (`snoc` ':') alias
<> name
<> optempty arguments args
<> optempty directives ds
<> optempty selectionSet ss
arguments :: [Argument] -> Text
arguments = parensCommas argument
argument :: Argument -> Text
argument (Argument name v) = name <> ":" <> value v
-- * Fragments
fragmentSpread :: FragmentSpread -> Text
fragmentSpread (FragmentSpread name ds) =
"..." <> name <> optempty directives ds
inlineFragment :: InlineFragment -> Text
inlineFragment (InlineFragment (NamedType tc) ds ss) =
"... on " <> tc
<> optempty directives ds
<> optempty selectionSet ss
fragmentDefinition :: FragmentDefinition -> Text
fragmentDefinition (FragmentDefinition name (NamedType tc) ds ss) =
"fragment " <> name <> " on " <> tc
<> optempty directives ds
<> selectionSet ss
-- * Values
value :: Value -> Text
value (ValueVariable x) = variable x
-- TODO: This will be replaced with `decimal` Buidler
value (ValueInt x) = pack $ show x
-- TODO: This will be replaced with `decimal` Buidler
value (ValueFloat x) = pack $ show x
value (ValueBoolean x) = booleanValue x
value (ValueString x) = stringValue x
value (ValueEnum x) = x
value (ValueList x) = listValue x
value (ValueObject x) = objectValue x
booleanValue :: Bool -> Text
booleanValue True = "true"
booleanValue False = "false"
-- TODO: Escape characters
stringValue :: Text -> Text
stringValue = quotes
listValue :: ListValue -> Text
listValue (ListValue vs) = bracketsCommas value vs
objectValue :: ObjectValue -> Text
objectValue (ObjectValue ofs) = bracesCommas objectField ofs
objectField :: ObjectField -> Text
objectField (ObjectField name v) = name <> ":" <> value v
-- * Directives
directives :: [Directive] -> Text
directives = spaces directive
directive :: Directive -> Text
directive (Directive name args) = "@" <> name <> optempty arguments args
-- * Type Reference
type_ :: Type -> Text
type_ (TypeNamed (NamedType x)) = x
type_ (TypeList x) = listType x
type_ (TypeNonNull x) = nonNullType x
namedType :: NamedType -> Text
namedType (NamedType name) = name
listType :: ListType -> Text
listType (ListType ty) = brackets (type_ ty)
nonNullType :: NonNullType -> Text
nonNullType (NonNullTypeNamed (NamedType x)) = x <> "!"
nonNullType (NonNullTypeList x) = listType x <> "!"
-- * Internal
spaced :: Text -> Text
spaced = cons '\SP'
between :: Char -> Char -> Text -> Text
between open close = cons open . (`snoc` close)
parens :: Text -> Text
parens = between '(' ')'
brackets :: Text -> Text
brackets = between '[' ']'
braces :: Text -> Text
braces = between '{' '}'
quotes :: Text -> Text
quotes = between '"' '"'
spaces :: (a -> Text) -> [a] -> Text
spaces f = intercalate "\SP" . fmap f
parensCommas :: (a -> Text) -> [a] -> Text
parensCommas f = parens . intercalate "," . fmap f
bracketsCommas :: (a -> Text) -> [a] -> Text
bracketsCommas f = brackets . intercalate "," . fmap f
bracesCommas :: (a -> Text) -> [a] -> Text
bracesCommas f = braces . intercalate "," . fmap f
optempty :: (Eq a, Monoid a, Monoid b) => (a -> b) -> a -> b
optempty f xs = if xs == mempty then mempty else f xs
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