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|
module MyElm.Stringify exposing (arg2string, declaration2string, expose2string, expression2string, module2string, needsBrackets, qualifiedName2string, type2str, type2string)
import MyElm.Types exposing (..)
-- indentation
indented : String -> String
indented s =
s
|> String.split "\n"
|> String.join "\n "
|> String.append " "
listLike : String -> String -> String -> List String -> String
listLike before sep after l =
let
shouldBeMultiline =
List.any (\ln -> List.length (String.split "\n" ln) > 1) l || List.foldl (\ln s -> s + String.length ln) 0 l > 100
in
if shouldBeMultiline then
"\n" ++ indented (before ++ " " ++ String.join ("\n" ++ sep) l ++ "\n" ++ after)
else if after == "" && before == "" then
String.join sep l
else
before ++ " " ++ String.join sep l ++ " " ++ after
bodyIndent : String -> String
bodyIndent str =
if List.length (String.split "\n" str) > 1 then
str
else
"\n " ++ str
expose2string : Exposing -> String
expose2string expose =
case expose of
ValueExposed val ->
val
TypeExposed tp ->
tp
TypeAndConstructors tp ->
tp ++ "(..)"
module2string : Module -> String
module2string (Module { name, exposes, doc, imports, declarations }) =
let
header =
"module " ++ name ++ " exposing (" ++ String.join ", " (List.map expose2string exposes) ++ ")\n\n"
docstr =
case doc of
Just d ->
"{-|" ++ d ++ "-}\n\n"
Nothing ->
""
imps =
String.join "\n" imports
++ (if List.length imports > 0 then
"\n\n\n"
else
""
)
decs =
String.join "" <| List.map declaration2string declarations
in
header ++ docstr ++ imps ++ decs
type2str : Bool -> Type -> String
type2str needsBr tp =
case tp of
NamedType qualifiedName typeList ->
if List.length typeList > 0 then
if needsBr then
"(" ++ qualifiedName2string qualifiedName ++ " " ++ String.join " " (List.map (type2str True) typeList) ++ ")"
else
qualifiedName2string qualifiedName ++ " " ++ String.join " " (List.map (type2str True) typeList)
else
qualifiedName2string qualifiedName
RecordType branches ->
"{ " ++ String.join ", " (List.map (\( name, typ ) -> name ++ " = " ++ type2str False typ) branches) ++ " }"
FunctionType typeList ->
let
a =
String.join " -> " (List.map (type2str False) typeList)
in
if needsBr then
"(" ++ a ++ ")"
else
a
TupleType typeList ->
"( " ++ String.join ", " (List.map (type2str False) typeList) ++ " )"
TypeVariable name ->
name
type2string =
type2str False
declaration2string : Declaration -> String
declaration2string declaration =
case declaration of
CustomType name variables variants ->
"type " ++ String.join " " (name :: variables) ++ "\n = " ++ String.join "\n | " (List.map (\( nm, args ) -> String.join " " (nm :: List.map (type2str True) args)) variants) ++ "\n\n\n"
TypeAlias name variables aliased ->
"type alias " ++ String.join " " (name :: variables) ++ "\n =" ++ type2string aliased ++ "\n\n\n"
Comment str ->
"{-|" ++ str ++ "}"
ValueDeclaration name anno argList expression ->
let
decl =
name ++ " " ++ String.join " " (List.map arg2string argList) ++ " =" ++ bodyIndent (expression2string expression) ++ "\n\n\n"
in
case anno of
[] ->
decl
signature ->
name ++ " : " ++ String.join " -> " (List.map type2string signature) ++ "\n" ++ decl
arg2string : Argument -> String
arg2string argument =
case argument of
Argument a ->
a
qualifiedName2string : QualifiedName -> String
qualifiedName2string qualifiedName =
let
identifierToStr id =
case id of
Constructor _ s ->
s
ValueOrType s ->
s
in
case qualifiedName of
Local ident ->
identifierToStr ident
FullyQualified modPath ident ->
String.join "." modPath ++ "." ++ identifierToStr ident
Aliased _ alias_ ident ->
alias_ ++ "." ++ identifierToStr ident
Bare _ ident ->
identifierToStr ident
bracketify : Expression -> String
bracketify arg =
if needsBrackets arg then
"(" ++ expression2string arg ++ ")"
else
expression2string arg
isOperator : String -> Bool
isOperator op =
case op of
"++" ->
True
"-" ->
True
"+" ->
True
"*" ->
True
"/" ->
True
"//" ->
True
"^" ->
True
"|>" ->
True
"<|" ->
True
_ ->
False
expression2string : Expression -> String
expression2string expression =
case expression of
Call name args ->
let
nameStr =
qualifiedName2string name
in
if isOperator nameStr then
case args of
a :: b :: rest ->
case nameStr of
"|>" ->
listLike "" " |> " "" [ expression2string a, String.join " " (List.map expression2string (b :: rest)) ]
_ ->
expression2string a ++ " " ++ nameStr ++ " " ++ String.join " " (List.map expression2string (b :: rest))
_ ->
"(" ++ nameStr ++ ") " ++ String.join " " (List.map bracketify args)
else
String.join " "
(nameStr
:: List.map
(\arg ->
if needsBrackets arg then
"(" ++ expression2string arg ++ ")"
else
expression2string arg
)
args
)
Literal lit ->
lit
ListExpr expressions ->
listLike "[" ", " "]" (List.map expression2string expressions)
Tuple expressions ->
listLike "(" ", " ")" (List.map expression2string expressions)
Record branches ->
listLike "{" ", " "}" (List.map (\( name, branch ) -> name ++ " = " ++ expression2string branch) branches)
needsBrackets : Expression -> Bool
needsBrackets expression =
case expression of
Call _ [] ->
False
Call _ _ ->
True
_ ->
False
|
