module Agda.Interaction.SearchAbout (findMentions) where

import Control.Monad

import qualified Data.Map as Map
import qualified Data.Set as Set
import Data.List (isInfixOf)
import Data.Either (partitionEithers)
import Data.Foldable (toList)

import Agda.Syntax.Position (Range)
import Agda.Syntax.Scope.Base
import Agda.Syntax.Scope.Monad
import Agda.TypeChecking.Monad.Signature
import Agda.TypeChecking.Monad.Env
import Agda.Syntax.Internal.Names (namesIn)
import Agda.Interaction.Base (Rewrite)
import Agda.Interaction.BasicOps (normalForm, parseName)

import qualified Agda.Syntax.Concrete as C
import qualified Agda.Syntax.Internal as I

import Agda.Utils.List   ( initLast1  )
import Agda.Utils.Pretty ( prettyShow )

findMentions :: Rewrite -> Range -> String -> ScopeM [(C.Name, I.Type)]
findMentions :: Rewrite -> Range -> String -> ScopeM [(Name, Type)]
findMentions Rewrite
norm Range
rg String
nm = do
  -- We start by dealing with the user's input

  -- The users passes in `nm`, a list of identifiers and strings
  -- to match against definitions in scope. `findMentions` will
  -- select all of the definitions such that:
  -- - all of the specified identifiers appear in their type
  --   (which has been normalised according to `norm`)
  -- - all of the specified strings are substrings of their name

  -- We separate the strings from the names by a rough analysis
  -- and then parse and resolve the names in the current scope
  let ([String]
userSubStrings, [String]
nms) = [Either String String] -> ([String], [String])
forall a b. [Either a b] -> ([a], [b])
partitionEithers ([Either String String] -> ([String], [String]))
-> [Either String String] -> ([String], [String])
forall a b. (a -> b) -> a -> b
$ String -> Either String String
isString (String -> Either String String)
-> [String] -> [Either String String]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> String -> [String]
words String
nm
  [ResolvedName]
rnms <- (String -> TCMT IO ResolvedName)
-> [String] -> TCMT IO [ResolvedName]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (QName -> TCMT IO ResolvedName
resolveName (QName -> TCMT IO ResolvedName)
-> (String -> TCMT IO QName) -> String -> TCMT IO ResolvedName
forall (m :: * -> *) b c a.
Monad m =>
(b -> m c) -> (a -> m b) -> a -> m c
<=< Range -> String -> TCMT IO QName
parseName Range
rg) [String]
nms
  let userIdentifiers :: [[QName]]
userIdentifiers = (ResolvedName -> [QName]) -> [ResolvedName] -> [[QName]]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap ((AbstractName -> QName) -> [AbstractName] -> [QName]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap AbstractName -> QName
anameName ([AbstractName] -> [QName])
-> (ResolvedName -> [AbstractName]) -> ResolvedName -> [QName]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ResolvedName -> [AbstractName]
anames) [ResolvedName]
rnms

  -- We then collect all the things in scope, by name.
  -- Issue #2381: We explicitly filter out pattern synonyms because they
  -- don't have a type. Looking it up makes Agda panic!
  NamesInScope
snms <- (Scope -> NamesInScope) -> TCMT IO Scope -> TCMT IO NamesInScope
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (NameSpace -> NamesInScope
nsNames (NameSpace -> NamesInScope)
-> (Scope -> NameSpace) -> Scope -> NamesInScope
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Scope -> NameSpace
allThingsInScope) (TCMT IO Scope -> TCMT IO NamesInScope)
-> TCMT IO Scope -> TCMT IO NamesInScope
forall a b. (a -> b) -> a -> b
$ ModuleName -> TCMT IO Scope
getNamedScope (ModuleName -> TCMT IO Scope)
-> TCMT IO ModuleName -> TCMT IO Scope
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< TCMT IO ModuleName
forall (m :: * -> *). MonadTCEnv m => m ModuleName
currentModule
  let namesInScope :: [(Name, AbstractName)]
namesInScope = ((Name, AbstractName) -> Bool)
-> [(Name, AbstractName)] -> [(Name, AbstractName)]
forall a. (a -> Bool) -> [a] -> [a]
filter ((KindOfName
PatternSynName KindOfName -> KindOfName -> Bool
forall a. Eq a => a -> a -> Bool
/=) (KindOfName -> Bool)
-> ((Name, AbstractName) -> KindOfName)
-> (Name, AbstractName)
-> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. AbstractName -> KindOfName
anameKind (AbstractName -> KindOfName)
-> ((Name, AbstractName) -> AbstractName)
-> (Name, AbstractName)
-> KindOfName
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Name, AbstractName) -> AbstractName
forall a b. (a, b) -> b
snd)
                   ([(Name, AbstractName)] -> [(Name, AbstractName)])
-> [(Name, AbstractName)] -> [(Name, AbstractName)]
forall a b. (a -> b) -> a -> b
$ ((Name, [AbstractName]) -> [(Name, AbstractName)])
-> [(Name, [AbstractName])] -> [(Name, AbstractName)]
forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
concatMap ((Name -> [AbstractName] -> [(Name, AbstractName)])
-> (Name, [AbstractName]) -> [(Name, AbstractName)]
forall a b c. (a -> b -> c) -> (a, b) -> c
uncurry ((Name -> [AbstractName] -> [(Name, AbstractName)])
 -> (Name, [AbstractName]) -> [(Name, AbstractName)])
-> (Name -> [AbstractName] -> [(Name, AbstractName)])
-> (Name, [AbstractName])
-> [(Name, AbstractName)]
forall a b. (a -> b) -> a -> b
$ (AbstractName -> (Name, AbstractName))
-> [AbstractName] -> [(Name, AbstractName)]
forall a b. (a -> b) -> [a] -> [b]
map ((AbstractName -> (Name, AbstractName))
 -> [AbstractName] -> [(Name, AbstractName)])
-> (Name -> AbstractName -> (Name, AbstractName))
-> Name
-> [AbstractName]
-> [(Name, AbstractName)]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (,)) ([(Name, [AbstractName])] -> [(Name, AbstractName)])
-> [(Name, [AbstractName])] -> [(Name, AbstractName)]
forall a b. (a -> b) -> a -> b
$ NamesInScope -> [(Name, [AbstractName])]
forall k a. Map k a -> [(k, a)]
Map.toList NamesInScope
snms

  -- Once we have the user-provided names and the names of all the
  -- thing in scope we can start the search: for each name in scope,
  -- we grab its type, normalise it according to `norm` and collect
  -- the identifiers in it. We then check whether it meets the user's
  -- criteria.
  [[(Name, Type)]]
ress <- [(Name, AbstractName)]
-> ((Name, AbstractName) -> ScopeM [(Name, Type)])
-> TCMT IO [[(Name, Type)]]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
t a -> (a -> m b) -> m (t b)
forM [(Name, AbstractName)]
namesInScope (((Name, AbstractName) -> ScopeM [(Name, Type)])
 -> TCMT IO [[(Name, Type)]])
-> ((Name, AbstractName) -> ScopeM [(Name, Type)])
-> TCMT IO [[(Name, Type)]]
forall a b. (a -> b) -> a -> b
$ \ (Name
x, AbstractName
n) -> do
    Type
t <- Rewrite -> Type -> TCM Type
forall t.
(Reduce t, Simplify t, Instantiate t, Normalise t) =>
Rewrite -> t -> TCM t
normalForm Rewrite
norm (Type -> TCM Type) -> TCM Type -> TCM Type
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< QName -> TCM Type
forall (m :: * -> *).
(HasConstInfo m, ReadTCState m) =>
QName -> m Type
typeOfConst (AbstractName -> QName
anameName AbstractName
n)
    [(Name, Type)] -> ScopeM [(Name, Type)]
forall (m :: * -> *) a. Monad m => a -> m a
return ([(Name, Type)] -> ScopeM [(Name, Type)])
-> [(Name, Type)] -> ScopeM [(Name, Type)]
forall a b. (a -> b) -> a -> b
$ do
      Bool -> [()]
forall (f :: * -> *). Alternative f => Bool -> f ()
guard (Bool -> [()]) -> Bool -> [()]
forall a b. (a -> b) -> a -> b
$ (String -> Bool) -> [String] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
all (String -> String -> Bool
forall a. Eq a => [a] -> [a] -> Bool
`isInfixOf` Name -> String
forall a. Pretty a => a -> String
prettyShow Name
x) [String]
userSubStrings
      Bool -> [()]
forall (f :: * -> *). Alternative f => Bool -> f ()
guard (Bool -> [()]) -> Bool -> [()]
forall a b. (a -> b) -> a -> b
$ ([QName] -> Bool) -> [[QName]] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
all ((QName -> Bool) -> [QName] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
any (QName -> Set QName -> Bool
forall a. Ord a => a -> Set a -> Bool
`Set.member` Type -> Set QName
forall a m. (NamesIn a, Collection QName m) => a -> m
namesIn Type
t)) [[QName]]
userIdentifiers
      (Name, Type) -> [(Name, Type)]
forall (m :: * -> *) a. Monad m => a -> m a
return (Name
x, Type
t)
  [(Name, Type)] -> ScopeM [(Name, Type)]
forall (m :: * -> *) a. Monad m => a -> m a
return ([(Name, Type)] -> ScopeM [(Name, Type)])
-> [(Name, Type)] -> ScopeM [(Name, Type)]
forall a b. (a -> b) -> a -> b
$ [[(Name, Type)]] -> [(Name, Type)]
forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat [[(Name, Type)]]
ress

  where
    isString :: String -> Either String String
    isString :: String -> Either String String
isString (Char
'"' : Char
c : String
cs)
      | (String
str, Char
'"') <- Char -> String -> (String, Char)
forall a. a -> [a] -> ([a], a)
initLast1 Char
c String
cs
      = String -> Either String String
forall a b. a -> Either a b
Left (String -> Either String String) -> String -> Either String String
forall a b. (a -> b) -> a -> b
$ (Char -> Bool) -> String -> String
forall a. (a -> Bool) -> [a] -> [a]
filter (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
/= Char
'"') String
str
    isString String
str
      = String -> Either String String
forall a b. b -> Either a b
Right String
str

    anames :: ResolvedName -> [AbstractName]
anames (DefinedName Access
_ AbstractName
an Suffix
_)   = [AbstractName
an]
    anames (FieldName     List1 AbstractName
ans)    = List1 AbstractName -> [AbstractName]
forall (t :: * -> *) a. Foldable t => t a -> [a]
toList List1 AbstractName
ans
    anames (ConstructorName Set Induction
_ List1 AbstractName
ans)= List1 AbstractName -> [AbstractName]
forall (t :: * -> *) a. Foldable t => t a -> [a]
toList List1 AbstractName
ans
    anames ResolvedName
_                      = []