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Expression.hs
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Expression.hs
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{-# LANGUAGE OverloadedStrings #-}
module Generate.JavaScript.Expression
( generate
, generateCtor
, generateField
, generateTailDef
, generateMain
, Code
, codeToExpr
, codeToStmtList
)
where
import qualified Data.IntMap as IntMap
import qualified Data.List as List
import Data.Map ((!))
import qualified Data.Map as Map
import qualified Data.Name as Name
import qualified Data.Set as Set
import qualified Data.Utf8 as Utf8
import qualified AST.Canonical as Can
import qualified AST.Optimized as Opt
import qualified AST.Utils.Shader as Shader
import qualified Data.Index as Index
import qualified Elm.Compiler.Type as Type
import qualified Elm.Compiler.Type.Extract as Extract
import qualified Elm.Version as V
import qualified Elm.ModuleName as ModuleName
import qualified Elm.Package as Pkg
import qualified Generate.JavaScript.Builder as JS
import qualified Generate.JavaScript.Name as JsName
import qualified Generate.Mode as Mode
import qualified Json.Encode as Encode
import Json.Encode ((==>))
import qualified Optimize.DecisionTree as DT
import qualified Reporting.Annotation as A
-- EXPRESSIONS
generateJsExpr :: Mode.Mode -> Opt.Expr -> JS.Expr
generateJsExpr mode expression =
codeToExpr (generate mode expression)
generate :: Mode.Mode -> Opt.Expr -> Code
generate mode expression =
case expression of
Opt.Bool bool ->
JsExpr $ JS.Bool bool
Opt.Chr char ->
JsExpr $
case mode of
Mode.Dev _ ->
JS.Call toChar [ JS.String (Utf8.toBuilder char) ]
Mode.Prod _ ->
JS.String (Utf8.toBuilder char)
Opt.Str string ->
JsExpr $ JS.String (Utf8.toBuilder string)
Opt.Int int ->
JsExpr $ JS.Int int
Opt.Float float ->
JsExpr $ JS.Float (Utf8.toBuilder float)
Opt.VarLocal name ->
JsExpr $ JS.Ref (JsName.fromLocal name)
Opt.VarGlobal (Opt.Global home name) ->
JsExpr $ JS.Ref (JsName.fromGlobal home name)
Opt.VarEnum (Opt.Global home name) index ->
case mode of
Mode.Dev _ ->
JsExpr $ JS.Ref (JsName.fromGlobal home name)
Mode.Prod _ ->
JsExpr $ JS.Int (Index.toMachine index)
Opt.VarBox (Opt.Global home name) ->
JsExpr $ JS.Ref $
case mode of
Mode.Dev _ -> JsName.fromGlobal home name
Mode.Prod _ -> JsName.fromGlobal ModuleName.basics Name.identity
Opt.VarCycle home name ->
JsExpr $ JS.Call (JS.Ref (JsName.fromCycle home name)) []
Opt.VarDebug name home region unhandledValueName ->
JsExpr $ generateDebug name home region unhandledValueName
Opt.VarKernel home name ->
JsExpr $ JS.Ref (JsName.fromKernel home name)
Opt.List entries ->
case entries of
[] ->
JsExpr $ JS.Ref (JsName.fromKernel Name.list "Nil")
_ ->
JsExpr $
JS.Call
(JS.Ref (JsName.fromKernel Name.list "fromArray"))
[ JS.Array $ map (generateJsExpr mode) entries
]
Opt.Function args body ->
generateFunction (map JsName.fromLocal args) (generate mode body)
Opt.Call func args ->
JsExpr $ generateCall mode func args
Opt.TailCall name args ->
JsBlock $ generateTailCall mode name args
Opt.If branches final ->
generateIf mode branches final
Opt.Let def body ->
JsBlock $
generateDef mode def : codeToStmtList (generate mode body)
Opt.Destruct (Opt.Destructor name path) body ->
let
pathDef = JS.Var (JsName.fromLocal name) (generatePath mode path)
in
JsBlock $ pathDef : codeToStmtList (generate mode body)
Opt.Case label root decider jumps ->
JsBlock $ generateCase mode label root decider jumps
Opt.Accessor field ->
JsExpr $ JS.Function Nothing [JsName.dollar]
[ JS.Return $
JS.Access (JS.Ref JsName.dollar) (generateField mode field)
]
Opt.Access record field ->
JsExpr $ JS.Access (generateJsExpr mode record) (generateField mode field)
Opt.Update record fields ->
JsExpr $
JS.Call (JS.Ref (JsName.fromKernel Name.utils "update"))
[ generateJsExpr mode record
, generateRecord mode fields
]
Opt.Record fields ->
JsExpr $ generateRecord mode fields
Opt.Unit ->
case mode of
Mode.Dev _ ->
JsExpr $ JS.Ref (JsName.fromKernel Name.utils "Tuple0")
Mode.Prod _ ->
JsExpr $ JS.Int 0
Opt.Tuple a b maybeC ->
JsExpr $
case maybeC of
Nothing ->
JS.Call (JS.Ref (JsName.fromKernel Name.utils "Tuple2"))
[ generateJsExpr mode a
, generateJsExpr mode b
]
Just c ->
JS.Call (JS.Ref (JsName.fromKernel Name.utils "Tuple3"))
[ generateJsExpr mode a
, generateJsExpr mode b
, generateJsExpr mode c
]
Opt.Shader src attributes uniforms ->
let
toTranlation field =
( JsName.fromLocal field
, JS.String (JsName.toBuilder (generateField mode field))
)
toTranslationObject fields =
JS.Object (map toTranlation (Set.toList fields))
in
JsExpr $ JS.Object $
[ ( JsName.fromLocal "src", JS.String (Shader.toJsStringBuilder src) )
, ( JsName.fromLocal "attributes", toTranslationObject attributes )
, ( JsName.fromLocal "uniforms", toTranslationObject uniforms )
]
-- CODE CHUNKS
data Code
= JsExpr JS.Expr
| JsBlock [JS.Stmt]
codeToExpr :: Code -> JS.Expr
codeToExpr code =
case code of
JsExpr expr ->
expr
JsBlock [ JS.Return expr ] ->
expr
JsBlock stmts ->
JS.Call (JS.Function Nothing [] stmts) []
codeToStmtList :: Code -> [JS.Stmt]
codeToStmtList code =
case code of
JsExpr (JS.Call (JS.Function Nothing [] stmts) []) ->
stmts
JsExpr expr ->
[ JS.Return expr ]
JsBlock stmts ->
stmts
codeToStmt :: Code -> JS.Stmt
codeToStmt code =
case code of
JsExpr (JS.Call (JS.Function Nothing [] stmts) []) ->
JS.Block stmts
JsExpr expr ->
JS.Return expr
JsBlock [stmt] ->
stmt
JsBlock stmts ->
JS.Block stmts
-- CHARS
{-# NOINLINE toChar #-}
toChar :: JS.Expr
toChar =
JS.Ref (JsName.fromKernel Name.utils "chr")
-- CTOR
generateCtor :: Mode.Mode -> Opt.Global -> Index.ZeroBased -> Int -> Code
generateCtor mode (Opt.Global home name) index arity =
let
argNames =
Index.indexedMap (\i _ -> JsName.fromIndex i) [1 .. arity]
ctorTag =
case mode of
Mode.Dev _ -> JS.String (Name.toBuilder name)
Mode.Prod _ -> JS.Int (ctorToInt home name index)
in
generateFunction argNames $ JsExpr $ JS.Object $
(JsName.dollar, ctorTag) : map (\n -> (n, JS.Ref n)) argNames
ctorToInt :: ModuleName.Canonical -> Name.Name -> Index.ZeroBased -> Int
ctorToInt home name index =
if home == ModuleName.dict && name == "RBNode_elm_builtin" || name == "RBEmpty_elm_builtin" then
0 - Index.toHuman index
else
Index.toMachine index
-- RECORDS
generateRecord :: Mode.Mode -> Map.Map Name.Name Opt.Expr -> JS.Expr
generateRecord mode fields =
let
toPair (field, value) =
(generateField mode field, generateJsExpr mode value)
in
JS.Object (map toPair (Map.toList fields))
generateField :: Mode.Mode -> Name.Name -> JsName.Name
generateField mode name =
case mode of
Mode.Dev _ ->
JsName.fromLocal name
Mode.Prod fields ->
fields ! name
-- DEBUG
generateDebug :: Name.Name -> ModuleName.Canonical -> A.Region -> Maybe Name.Name -> JS.Expr
generateDebug name (ModuleName.Canonical _ home) region unhandledValueName =
if name /= "todo" then
JS.Ref (JsName.fromGlobal ModuleName.debug name)
else
case unhandledValueName of
Nothing ->
JS.Call (JS.Ref (JsName.fromKernel Name.debug "todo")) $
[ JS.String (Name.toBuilder home)
, regionToJsExpr region
]
Just valueName ->
JS.Call (JS.Ref (JsName.fromKernel Name.debug "todoCase")) $
[ JS.String (Name.toBuilder home)
, regionToJsExpr region
, JS.Ref (JsName.fromLocal valueName)
]
regionToJsExpr :: A.Region -> JS.Expr
regionToJsExpr (A.Region start end) =
JS.Object
[ ( JsName.fromLocal "start", positionToJsExpr start )
, ( JsName.fromLocal "end", positionToJsExpr end )
]
positionToJsExpr :: A.Position -> JS.Expr
positionToJsExpr (A.Position line column) =
JS.Object
[ ( JsName.fromLocal "line", JS.Int (fromIntegral line) )
, ( JsName.fromLocal "column", JS.Int (fromIntegral column) )
]
-- FUNCTION
generateFunction :: [JsName.Name] -> Code -> Code
generateFunction args body =
case IntMap.lookup (length args) funcHelpers of
Just helper ->
JsExpr $
JS.Call helper
[ JS.Function Nothing args $
codeToStmtList body
]
Nothing ->
let
addArg arg code =
JsExpr $ JS.Function Nothing [arg] $
codeToStmtList code
in
foldr addArg body args
{-# NOINLINE funcHelpers #-}
funcHelpers :: IntMap.IntMap JS.Expr
funcHelpers =
IntMap.fromList $
map (\n -> (n, JS.Ref (JsName.makeF n))) [2..9]
-- CALLS
generateCall :: Mode.Mode -> Opt.Expr -> [Opt.Expr] -> JS.Expr
generateCall mode func args =
case func of
Opt.VarGlobal global@(Opt.Global (ModuleName.Canonical pkg _) _) | pkg == Pkg.core ->
generateCoreCall mode global args
Opt.VarBox _ ->
case mode of
Mode.Dev _ ->
generateCallHelp mode func args
Mode.Prod _ ->
case args of
[arg] ->
generateJsExpr mode arg
_ ->
generateCallHelp mode func args
_ ->
generateCallHelp mode func args
generateCallHelp :: Mode.Mode -> Opt.Expr -> [Opt.Expr] -> JS.Expr
generateCallHelp mode func args =
generateNormalCall
(generateJsExpr mode func)
(map (generateJsExpr mode) args)
generateGlobalCall :: ModuleName.Canonical -> Name.Name -> [JS.Expr] -> JS.Expr
generateGlobalCall home name args =
generateNormalCall (JS.Ref (JsName.fromGlobal home name)) args
generateNormalCall :: JS.Expr -> [JS.Expr] -> JS.Expr
generateNormalCall func args =
case IntMap.lookup (length args) callHelpers of
Just helper ->
JS.Call helper (func:args)
Nothing ->
List.foldl' (\f a -> JS.Call f [a]) func args
{-# NOINLINE callHelpers #-}
callHelpers :: IntMap.IntMap JS.Expr
callHelpers =
IntMap.fromList $
map (\n -> (n, JS.Ref (JsName.makeA n))) [2..9]
-- CORE CALLS
generateCoreCall :: Mode.Mode -> Opt.Global -> [Opt.Expr] -> JS.Expr
generateCoreCall mode (Opt.Global home@(ModuleName.Canonical _ moduleName) name) args =
if moduleName == Name.basics then
generateBasicsCall mode home name args
else if moduleName == Name.bitwise then
generateBitwiseCall home name (map (generateJsExpr mode) args)
else if moduleName == Name.tuple then
generateTupleCall home name (map (generateJsExpr mode) args)
else if moduleName == Name.jsArray then
generateJsArrayCall home name (map (generateJsExpr mode) args)
else
generateGlobalCall home name (map (generateJsExpr mode) args)
generateTupleCall :: ModuleName.Canonical -> Name.Name -> [JS.Expr] -> JS.Expr
generateTupleCall home name args =
case args of
[value] ->
case name of
"first" -> JS.Access value (JsName.fromLocal "a")
"second" -> JS.Access value (JsName.fromLocal "b")
_ -> generateGlobalCall home name args
_ ->
generateGlobalCall home name args
generateJsArrayCall :: ModuleName.Canonical -> Name.Name -> [JS.Expr] -> JS.Expr
generateJsArrayCall home name args =
case args of
[entry] | name == "singleton" -> JS.Array [entry]
[index, array] | name == "unsafeGet" -> JS.Index array index
_ -> generateGlobalCall home name args
generateBitwiseCall :: ModuleName.Canonical -> Name.Name -> [JS.Expr] -> JS.Expr
generateBitwiseCall home name args =
case args of
[arg] ->
case name of
"complement" -> JS.Prefix JS.PrefixComplement arg
_ -> generateGlobalCall home name args
[left,right] ->
case name of
"and" -> JS.Infix JS.OpBitwiseAnd left right
"or" -> JS.Infix JS.OpBitwiseOr left right
"xor" -> JS.Infix JS.OpBitwiseXor left right
"shiftLeftBy" -> JS.Infix JS.OpLShift right left
"shiftRightBy" -> JS.Infix JS.OpSpRShift right left
"shiftRightZfBy" -> JS.Infix JS.OpZfRShift right left
_ -> generateGlobalCall home name args
_ ->
generateGlobalCall home name args
generateBasicsCall :: Mode.Mode -> ModuleName.Canonical -> Name.Name -> [Opt.Expr] -> JS.Expr
generateBasicsCall mode home name args =
case args of
[elmArg] ->
let arg = generateJsExpr mode elmArg in
case name of
"not" -> JS.Prefix JS.PrefixNot arg
"negate" -> JS.Prefix JS.PrefixNegate arg
"toFloat" -> arg
"truncate" -> JS.Infix JS.OpBitwiseOr arg (JS.Int 0)
_ -> generateGlobalCall home name [arg]
[elmLeft, elmRight] ->
case name of
-- NOTE: removed "composeL" and "composeR" because of this issue:
-- https://github.com/elm/compiler/issues/1722
"append" -> append mode elmLeft elmRight
"apL" -> generateJsExpr mode $ apply elmLeft elmRight
"apR" -> generateJsExpr mode $ apply elmRight elmLeft
_ ->
let
left = generateJsExpr mode elmLeft
right = generateJsExpr mode elmRight
in
case name of
"add" -> JS.Infix JS.OpAdd left right
"sub" -> JS.Infix JS.OpSub left right
"mul" -> JS.Infix JS.OpMul left right
"fdiv" -> JS.Infix JS.OpDiv left right
"idiv" -> JS.Infix JS.OpBitwiseOr (JS.Infix JS.OpDiv left right) (JS.Int 0)
"eq" -> equal left right
"neq" -> notEqual left right
"lt" -> cmp JS.OpLt JS.OpLt 0 left right
"gt" -> cmp JS.OpGt JS.OpGt 0 left right
"le" -> cmp JS.OpLe JS.OpLt 1 left right
"ge" -> cmp JS.OpGe JS.OpGt (-1) left right
"or" -> JS.Infix JS.OpOr left right
"and" -> JS.Infix JS.OpAnd left right
"xor" -> JS.Infix JS.OpNe left right
"remainderBy" -> JS.Infix JS.OpMod right left
_ -> generateGlobalCall home name [left, right]
_ ->
generateGlobalCall home name (map (generateJsExpr mode) args)
equal :: JS.Expr -> JS.Expr -> JS.Expr
equal left right =
if isLiteral left || isLiteral right then
strictEq left right
else
JS.Call (JS.Ref (JsName.fromKernel Name.utils "eq")) [left, right]
notEqual :: JS.Expr -> JS.Expr -> JS.Expr
notEqual left right =
if isLiteral left || isLiteral right then
strictNEq left right
else
JS.Prefix JS.PrefixNot $
JS.Call (JS.Ref (JsName.fromKernel Name.utils "eq")) [left, right]
cmp :: JS.InfixOp -> JS.InfixOp -> Int -> JS.Expr -> JS.Expr -> JS.Expr
cmp idealOp backupOp backupInt left right =
if isLiteral left || isLiteral right then
JS.Infix idealOp left right
else
JS.Infix backupOp
(JS.Call (JS.Ref (JsName.fromKernel Name.utils "cmp")) [left, right])
(JS.Int backupInt)
isLiteral :: JS.Expr -> Bool
isLiteral expr =
case expr of
JS.String _ ->
True
JS.Float _ ->
True
JS.Int _ ->
True
JS.Bool _ ->
True
_ ->
False
apply :: Opt.Expr -> Opt.Expr -> Opt.Expr
apply func value =
case func of
Opt.Accessor field ->
Opt.Access value field
Opt.Call f args ->
Opt.Call f (args ++ [value])
_ ->
Opt.Call func [value]
append :: Mode.Mode -> Opt.Expr -> Opt.Expr -> JS.Expr
append mode left right =
let seqs = generateJsExpr mode left : toSeqs mode right in
if any isStringLiteral seqs then
foldr1 (JS.Infix JS.OpAdd) seqs
else
foldr1 jsAppend seqs
jsAppend :: JS.Expr -> JS.Expr -> JS.Expr
jsAppend a b =
JS.Call (JS.Ref (JsName.fromKernel Name.utils "ap")) [a, b]
toSeqs :: Mode.Mode -> Opt.Expr -> [JS.Expr]
toSeqs mode expr =
case expr of
Opt.Call (Opt.VarGlobal (Opt.Global home "append")) [left, right]
| home == ModuleName.basics ->
generateJsExpr mode left : toSeqs mode right
_ ->
[generateJsExpr mode expr]
isStringLiteral :: JS.Expr -> Bool
isStringLiteral expr =
case expr of
JS.String _ ->
True
_ ->
False
-- SIMPLIFY INFIX OPERATORS
strictEq :: JS.Expr -> JS.Expr -> JS.Expr
strictEq left right =
case left of
JS.Int 0 ->
JS.Prefix JS.PrefixNot right
JS.Bool bool ->
if bool then right else JS.Prefix JS.PrefixNot right
_ ->
case right of
JS.Int 0 ->
JS.Prefix JS.PrefixNot left
JS.Bool bool ->
if bool then left else JS.Prefix JS.PrefixNot left
_ ->
JS.Infix JS.OpEq left right
strictNEq :: JS.Expr -> JS.Expr -> JS.Expr
strictNEq left right =
case left of
JS.Int 0 ->
JS.Prefix JS.PrefixNot (JS.Prefix JS.PrefixNot right)
JS.Bool bool ->
if bool then JS.Prefix JS.PrefixNot right else right
_ ->
case right of
JS.Int 0 ->
JS.Prefix JS.PrefixNot (JS.Prefix JS.PrefixNot left)
JS.Bool bool ->
if bool then JS.Prefix JS.PrefixNot left else left
_ ->
JS.Infix JS.OpNe left right
-- TAIL CALL
-- TODO check if JS minifiers collapse unnecessary temporary variables
--
generateTailCall :: Mode.Mode -> Name.Name -> [(Name.Name, Opt.Expr)] -> [JS.Stmt]
generateTailCall mode name args =
let
toTempVars (argName, arg) =
( JsName.makeTemp argName, generateJsExpr mode arg )
toRealVars (argName, _) =
JS.ExprStmt $
JS.Assign (JS.LRef (JsName.fromLocal argName)) (JS.Ref (JsName.makeTemp argName))
in
JS.Vars (map toTempVars args)
: map toRealVars args
++ [ JS.Continue (Just (JsName.fromLocal name)) ]
-- DEFINITIONS
generateDef :: Mode.Mode -> Opt.Def -> JS.Stmt
generateDef mode def =
case def of
Opt.Def name body ->
JS.Var (JsName.fromLocal name) (generateJsExpr mode body)
Opt.TailDef name argNames body ->
JS.Var (JsName.fromLocal name) (codeToExpr (generateTailDef mode name argNames body))
generateTailDef :: Mode.Mode -> Name.Name -> [Name.Name] -> Opt.Expr -> Code
generateTailDef mode name argNames body =
generateFunction (map JsName.fromLocal argNames) $ JsBlock $
[ JS.Labelled (JsName.fromLocal name) $
JS.While (JS.Bool True) $
codeToStmt $ generate mode body
]
-- PATHS
generatePath :: Mode.Mode -> Opt.Path -> JS.Expr
generatePath mode path =
case path of
Opt.Index index subPath ->
JS.Access (generatePath mode subPath) (JsName.fromIndex index)
Opt.Root name ->
JS.Ref (JsName.fromLocal name)
Opt.Field field subPath ->
JS.Access (generatePath mode subPath) (generateField mode field)
Opt.Unbox subPath ->
case mode of
Mode.Dev _ ->
JS.Access (generatePath mode subPath) (JsName.fromIndex Index.first)
Mode.Prod _ ->
generatePath mode subPath
-- GENERATE IFS
generateIf :: Mode.Mode -> [(Opt.Expr, Opt.Expr)] -> Opt.Expr -> Code
generateIf mode givenBranches givenFinal =
let
(branches, final) =
crushIfs givenBranches givenFinal
convertBranch (condition, expr) =
( generateJsExpr mode condition
, generate mode expr
)
branchExprs = map convertBranch branches
finalCode = generate mode final
in
if isBlock finalCode || any (isBlock . snd) branchExprs then
JsBlock [ foldr addStmtIf (codeToStmt finalCode) branchExprs ]
else
JsExpr $ foldr addExprIf (codeToExpr finalCode) branchExprs
addExprIf :: (JS.Expr, Code) -> JS.Expr -> JS.Expr
addExprIf (condition, branch) final =
JS.If condition (codeToExpr branch) final
addStmtIf :: (JS.Expr, Code) -> JS.Stmt -> JS.Stmt
addStmtIf (condition, branch) final =
JS.IfStmt condition (codeToStmt branch) final
isBlock :: Code -> Bool
isBlock code =
case code of
JsBlock _ -> True
JsExpr _ -> False
crushIfs :: [(Opt.Expr, Opt.Expr)] -> Opt.Expr -> ([(Opt.Expr, Opt.Expr)], Opt.Expr)
crushIfs branches final =
crushIfsHelp [] branches final
crushIfsHelp
:: [(Opt.Expr, Opt.Expr)]
-> [(Opt.Expr, Opt.Expr)]
-> Opt.Expr
-> ([(Opt.Expr, Opt.Expr)], Opt.Expr)
crushIfsHelp visitedBranches unvisitedBranches final =
case unvisitedBranches of
[] ->
case final of
Opt.If subBranches subFinal ->
crushIfsHelp visitedBranches subBranches subFinal
_ ->
(reverse visitedBranches, final)
visiting : unvisited ->
crushIfsHelp (visiting : visitedBranches) unvisited final
-- CASE EXPRESSIONS
generateCase :: Mode.Mode -> Name.Name -> Name.Name -> Opt.Decider Opt.Choice -> [(Int, Opt.Expr)] -> [JS.Stmt]
generateCase mode label root decider jumps =
foldr (goto mode label) (generateDecider mode label root decider) jumps
goto :: Mode.Mode -> Name.Name -> (Int, Opt.Expr) -> [JS.Stmt] -> [JS.Stmt]
goto mode label (index, branch) stmts =
let
labeledDeciderStmt =
JS.Labelled
(JsName.makeLabel label index)
(JS.While (JS.Bool True) (JS.Block stmts))
in
labeledDeciderStmt : codeToStmtList (generate mode branch)
generateDecider :: Mode.Mode -> Name.Name -> Name.Name -> Opt.Decider Opt.Choice -> [JS.Stmt]
generateDecider mode label root decisionTree =
case decisionTree of
Opt.Leaf (Opt.Inline branch) ->
codeToStmtList (generate mode branch)
Opt.Leaf (Opt.Jump index) ->
[ JS.Break (Just (JsName.makeLabel label index)) ]
Opt.Chain testChain success failure ->
[ JS.IfStmt
(List.foldl1' (JS.Infix JS.OpAnd) (map (generateIfTest mode root) testChain))
(JS.Block $ generateDecider mode label root success)
(JS.Block $ generateDecider mode label root failure)
]
Opt.FanOut path edges fallback ->
[ JS.Switch
(generateCaseTest mode root path (fst (head edges)))
( foldr
(\edge cases -> generateCaseBranch mode label root edge : cases)
[ JS.Default (generateDecider mode label root fallback) ]
edges
)
]
generateIfTest :: Mode.Mode -> Name.Name -> (DT.Path, DT.Test) -> JS.Expr
generateIfTest mode root (path, test) =
let
value = pathToJsExpr mode root path
in
case test of
DT.IsCtor home name index _ opts ->
let
tag =
case mode of
Mode.Dev _ -> JS.Access value JsName.dollar
Mode.Prod _ ->
case opts of
Can.Normal -> JS.Access value JsName.dollar
Can.Enum -> value
Can.Unbox -> value
in
strictEq tag $
case mode of
Mode.Dev _ -> JS.String (Name.toBuilder name)
Mode.Prod _ -> JS.Int (ctorToInt home name index)
DT.IsBool True ->
value
DT.IsBool False ->
JS.Prefix JS.PrefixNot value
DT.IsInt int ->
strictEq value (JS.Int int)
DT.IsChr char ->
strictEq (JS.String (Utf8.toBuilder char)) $
case mode of
Mode.Dev _ -> JS.Call (JS.Access value (JsName.fromLocal "valueOf")) []
Mode.Prod _ -> value
DT.IsStr string ->
strictEq value (JS.String (Utf8.toBuilder string))
DT.IsCons ->
JS.Access value (JsName.fromLocal "b")
DT.IsNil ->
JS.Prefix JS.PrefixNot $
JS.Access value (JsName.fromLocal "b")
DT.IsTuple ->
error "COMPILER BUG - there should never be tests on a tuple"
generateCaseBranch :: Mode.Mode -> Name.Name -> Name.Name -> (DT.Test, Opt.Decider Opt.Choice) -> JS.Case
generateCaseBranch mode label root (test, subTree) =
JS.Case
(generateCaseValue mode test)
(generateDecider mode label root subTree)
generateCaseValue :: Mode.Mode -> DT.Test -> JS.Expr
generateCaseValue mode test =
case test of
DT.IsCtor home name index _ _ ->
case mode of
Mode.Dev _ -> JS.String (Name.toBuilder name)
Mode.Prod _ -> JS.Int (ctorToInt home name index)
DT.IsInt int ->
JS.Int int
DT.IsChr char ->
JS.String (Utf8.toBuilder char)
DT.IsStr string ->
JS.String (Utf8.toBuilder string)
DT.IsBool _ ->
error "COMPILER BUG - there should never be three tests on a boolean"
DT.IsCons ->
error "COMPILER BUG - there should never be three tests on a list"
DT.IsNil ->
error "COMPILER BUG - there should never be three tests on a list"
DT.IsTuple ->
error "COMPILER BUG - there should never be three tests on a tuple"
generateCaseTest :: Mode.Mode -> Name.Name -> DT.Path -> DT.Test -> JS.Expr
generateCaseTest mode root path exampleTest =
let
value = pathToJsExpr mode root path
in
case exampleTest of
DT.IsCtor home name _ _ opts ->
if name == Name.bool && home == ModuleName.basics then
value
else
case mode of
Mode.Dev _ ->
JS.Access value JsName.dollar
Mode.Prod _ ->
case opts of
Can.Normal ->
JS.Access value JsName.dollar
Can.Enum ->
value
Can.Unbox ->
value
DT.IsInt _ ->
value
DT.IsStr _ ->
value
DT.IsChr _ ->
case mode of
Mode.Dev _ ->
JS.Call (JS.Access value (JsName.fromLocal "valueOf")) []
Mode.Prod _ ->
value
DT.IsBool _ ->
error "COMPILER BUG - there should never be three tests on a list"