mirror of
https://github.com/GrammaticalFramework/gf-core.git
synced 2026-04-09 04:59:31 -06:00
added parsing of json into canonical GF
This commit is contained in:
Peter Ljunglöf
@@ -3,6 +3,8 @@ module GF.Grammar.CanonicalJSON (
|
||||
) where
|
||||
|
||||
import Text.JSON
|
||||
import Control.Applicative ((<|>))
|
||||
import Data.Ratio (denominator, numerator)
|
||||
import GF.Grammar.Canonical
|
||||
|
||||
|
||||
@@ -19,6 +21,8 @@ encodeJSON fpath g = writeFile fpath (encode g)
|
||||
instance JSON Grammar where
|
||||
showJSON (Grammar abs cncs) = makeObj [("abstract", showJSON abs), ("concretes", showJSON cncs)]
|
||||
|
||||
readJSON o = Grammar <$> o!"abstract" <*> o!"concretes"
|
||||
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
-- ** Abstract Syntax
|
||||
@@ -30,27 +34,47 @@ instance JSON Abstract where
|
||||
("cats", showJSON cats),
|
||||
("funs", showJSON funs)]
|
||||
|
||||
readJSON o = Abstract
|
||||
<$> o!"abs"
|
||||
<*>(o!"flags" <|> return (Flags []))
|
||||
<*> o!"cats"
|
||||
<*> o!"funs"
|
||||
|
||||
instance JSON CatDef where
|
||||
-- non-dependent categories are encoded as simple strings:
|
||||
showJSON (CatDef c []) = showJSON c
|
||||
showJSON (CatDef c cs) = makeObj [("cat", showJSON c), ("args", showJSON cs)]
|
||||
|
||||
readJSON o = CatDef <$> readJSON o <*> return []
|
||||
<|> CatDef <$> o!"cat" <*> o!"args"
|
||||
|
||||
instance JSON FunDef where
|
||||
showJSON (FunDef f ty) = makeObj [("fun", showJSON f), ("type", showJSON ty)]
|
||||
|
||||
readJSON o = FunDef <$> o!"fun" <*> o!"type"
|
||||
|
||||
instance JSON Type where
|
||||
showJSON (Type bs ty) = makeObj [(".args", showJSON bs), (".result", showJSON ty)]
|
||||
|
||||
readJSON o = Type <$> o!".args" <*> o!".result"
|
||||
|
||||
instance JSON TypeApp where
|
||||
-- non-dependent categories are encoded as simple strings:
|
||||
showJSON (TypeApp c []) = showJSON c
|
||||
showJSON (TypeApp c args) = makeObj [(".cat", showJSON c), (".args", showJSON args)]
|
||||
|
||||
readJSON o = TypeApp <$> readJSON o <*> return []
|
||||
<|> TypeApp <$> o!".cat" <*> o!".args"
|
||||
|
||||
instance JSON TypeBinding where
|
||||
-- non-dependent categories are encoded as simple strings:
|
||||
showJSON (TypeBinding Anonymous (Type [] (TypeApp c []))) = showJSON c
|
||||
showJSON (TypeBinding x ty) = makeObj [(".var", showJSON x), (".type", showJSON ty)]
|
||||
|
||||
readJSON o = do c <- readJSON o
|
||||
return (TypeBinding Anonymous (Type [] (TypeApp c [])))
|
||||
<|> TypeBinding <$> o!".var" <*> o!".type"
|
||||
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
-- ** Concrete syntax
|
||||
@@ -64,16 +88,31 @@ instance JSON Concrete where
|
||||
("lincats", showJSON lincats),
|
||||
("lins", showJSON lins)]
|
||||
|
||||
readJSON o = Concrete
|
||||
<$> o!"cnc"
|
||||
<*> o!"abs"
|
||||
<*>(o!"flags" <|> return (Flags []))
|
||||
<*> o!"params"
|
||||
<*> o!"lincats"
|
||||
<*> o!"lins"
|
||||
|
||||
instance JSON ParamDef where
|
||||
showJSON (ParamDef p pvs) = makeObj [("param", showJSON p), ("values", showJSON pvs)]
|
||||
showJSON (ParamAliasDef p t) = makeObj [("param", showJSON p), ("alias", showJSON t)]
|
||||
|
||||
readJSON o = ParamDef <$> o!"param" <*> o!"values"
|
||||
<|> ParamAliasDef <$> o!"param" <*> o!"alias"
|
||||
|
||||
instance JSON LincatDef where
|
||||
showJSON (LincatDef c lt) = makeObj [("cat", showJSON c), ("lintype", showJSON lt)]
|
||||
|
||||
readJSON o = LincatDef <$> o!"cat" <*> o!"lintype"
|
||||
|
||||
instance JSON LinDef where
|
||||
showJSON (LinDef f xs lv) = makeObj [("fun", showJSON f), ("args", showJSON xs), ("lin", showJSON lv)]
|
||||
|
||||
readJSON o = LinDef <$> o!"fun" <*> o!"args" <*> o!"lin"
|
||||
|
||||
instance JSON LinType where
|
||||
-- the basic types (Str, Float, Int) are encoded as strings:
|
||||
showJSON (StrType) = showJSON "Str"
|
||||
@@ -87,6 +126,14 @@ instance JSON LinType where
|
||||
-- records are encoded as records:
|
||||
showJSON (RecordType rows) = showJSON rows
|
||||
|
||||
readJSON o = do "Str" <- readJSON o; return StrType
|
||||
<|> do "Float" <- readJSON o; return FloatType
|
||||
<|> do "Int" <- readJSON o; return IntType
|
||||
<|> do ptype <- readJSON o; return (ParamType ptype)
|
||||
<|> TableType <$> o!".tblarg" <*> o!".tblval"
|
||||
<|> TupleType <$> o!".tuple"
|
||||
<|> RecordType <$> readJSON o
|
||||
|
||||
instance JSON LinValue where
|
||||
showJSON (LiteralValue l ) = showJSON l
|
||||
-- concatenation is encoded as a JSON array:
|
||||
@@ -105,12 +152,27 @@ instance JSON LinValue where
|
||||
-- records are encoded directly as JSON records:
|
||||
showJSON (RecordValue rows) = showJSON rows
|
||||
|
||||
readJSON o = LiteralValue <$> readJSON o
|
||||
<|> ParamConstant <$> o!".param"
|
||||
<|> PredefValue <$> o!".predef"
|
||||
<|> TableValue <$> o!".tblarg" <*> o!".tblrows"
|
||||
<|> TupleValue <$> o!".tuple"
|
||||
<|> VarValue <$> o!".var"
|
||||
<|> ErrorValue <$> o!".error"
|
||||
<|> Projection <$> o!".project" <*> o!".label"
|
||||
<|> Selection <$> o!".select" <*> o!".key"
|
||||
<|> VariantValue <$> o!".variants"
|
||||
<|> PreValue <$> o!".pre" <*> o!".default"
|
||||
<|> RecordValue <$> readJSON o
|
||||
|
||||
instance JSON LinLiteral where
|
||||
-- basic values (Str, Float, Int) are encoded as JSON strings/numbers:
|
||||
showJSON (StrConstant s) = showJSON s
|
||||
showJSON (FloatConstant f) = showJSON f
|
||||
showJSON (IntConstant n) = showJSON n
|
||||
|
||||
readJSON = readBasicJSON StrConstant IntConstant FloatConstant
|
||||
|
||||
instance JSON LinPattern where
|
||||
-- wildcards and patterns without arguments are encoded as strings:
|
||||
showJSON (WildPattern) = showJSON "_"
|
||||
@@ -120,53 +182,104 @@ instance JSON LinPattern where
|
||||
-- and records as records:
|
||||
showJSON (RecordPattern r) = showJSON r
|
||||
|
||||
readJSON o = do "_" <- readJSON o; return WildPattern
|
||||
<|> do p <- readJSON o; return (ParamPattern (Param p []))
|
||||
<|> ParamPattern <$> readJSON o
|
||||
<|> RecordPattern <$> readJSON o
|
||||
|
||||
instance JSON arg => JSON (Param arg) where
|
||||
-- parameters without arguments are encoded as strings:
|
||||
showJSON (Param p []) = showJSON p
|
||||
showJSON (Param p args) = makeObj [(".paramid", showJSON p), (".args", showJSON args)]
|
||||
|
||||
readJSON o = Param <$> readJSON o <*> return []
|
||||
<|> Param <$> o!".paramid" <*> o!".args"
|
||||
|
||||
instance JSON a => JSON (RecordRow a) where
|
||||
-- record rows and lists of record rows are both encoded as JSON records (i.e., objects)
|
||||
showJSON row = showJSONs [row]
|
||||
showJSONs rows = makeObj (map toRow rows)
|
||||
where toRow (RecordRow (LabelId lbl) val) = (lbl, showJSON val)
|
||||
|
||||
readJSON obj = head <$> readJSONs obj
|
||||
readJSONs obj = mapM fromRow (assocsJSObject obj)
|
||||
where fromRow (lbl, jsvalue) = do value <- readJSON jsvalue
|
||||
return (RecordRow (LabelId lbl) value)
|
||||
|
||||
instance JSON TableRowValue where
|
||||
showJSON (TableRowValue l v) = makeObj [(".pattern", showJSON l), (".value", showJSON v)]
|
||||
|
||||
readJSON o = TableRowValue <$> o!".pattern" <*> o!".value"
|
||||
|
||||
|
||||
-- *** Identifiers in Concrete Syntax
|
||||
|
||||
instance JSON PredefId where showJSON (PredefId s) = showJSON s
|
||||
instance JSON LabelId where showJSON (LabelId s) = showJSON s
|
||||
instance JSON VarValueId where showJSON (VarValueId s) = showJSON s
|
||||
instance JSON ParamId where showJSON (ParamId s) = showJSON s
|
||||
instance JSON ParamType where showJSON (ParamTypeId s) = showJSON s
|
||||
instance JSON PredefId where showJSON (PredefId s) = showJSON s ; readJSON = fmap PredefId . readJSON
|
||||
instance JSON LabelId where showJSON (LabelId s) = showJSON s ; readJSON = fmap LabelId . readJSON
|
||||
instance JSON VarValueId where showJSON (VarValueId s) = showJSON s ; readJSON = fmap VarValueId . readJSON
|
||||
instance JSON ParamId where showJSON (ParamId s) = showJSON s ; readJSON = fmap ParamId . readJSON
|
||||
instance JSON ParamType where showJSON (ParamTypeId s) = showJSON s ; readJSON = fmap ParamTypeId . readJSON
|
||||
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
-- ** Used in both Abstract and Concrete Syntax
|
||||
|
||||
instance JSON ModId where showJSON (ModId s) = showJSON s
|
||||
instance JSON CatId where showJSON (CatId s) = showJSON s
|
||||
instance JSON FunId where showJSON (FunId s) = showJSON s
|
||||
instance JSON ModId where showJSON (ModId s) = showJSON s ; readJSON = fmap ModId . readJSON
|
||||
instance JSON CatId where showJSON (CatId s) = showJSON s ; readJSON = fmap CatId . readJSON
|
||||
instance JSON FunId where showJSON (FunId s) = showJSON s ; readJSON = fmap FunId . readJSON
|
||||
|
||||
instance JSON VarId where
|
||||
-- the anonymous variable is the underscore:
|
||||
showJSON Anonymous = showJSON "_"
|
||||
showJSON (VarId x) = showJSON x
|
||||
|
||||
readJSON o = do "_" <- readJSON o; return Anonymous
|
||||
<|> VarId <$> readJSON o
|
||||
|
||||
instance JSON QualId where
|
||||
showJSON (Qual (ModId m) n) = showJSON (m++"."++n)
|
||||
showJSON (Unqual n) = showJSON n
|
||||
|
||||
readJSON o = do qualid <- readJSON o
|
||||
let (mod, id) = span (/= '.') qualid
|
||||
return $ if null mod then Unqual id else Qual (ModId mod) id
|
||||
|
||||
instance JSON Flags where
|
||||
-- flags are encoded directly as JSON records (i.e., objects):
|
||||
showJSON (Flags fs) = makeObj [(f, showJSON v) | (f, v) <- fs]
|
||||
|
||||
readJSON obj = Flags <$> mapM fromRow (assocsJSObject obj)
|
||||
where fromRow (lbl, jsvalue) = do value <- readJSON jsvalue
|
||||
return (lbl, value)
|
||||
|
||||
instance JSON FlagValue where
|
||||
-- flag values are encoded as basic JSON types:
|
||||
showJSON (Str s) = showJSON s
|
||||
showJSON (Int i) = showJSON i
|
||||
showJSON (Flt f) = showJSON f
|
||||
|
||||
readJSON = readBasicJSON Str Int Flt
|
||||
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
-- ** Convenience functions
|
||||
|
||||
(!) :: JSON a => JSValue -> String -> Result a
|
||||
obj ! key = maybe (fail $ "CanonicalJSON.(!): Could not find key: " ++ show key)
|
||||
readJSON
|
||||
(lookup key (assocsJSObject obj))
|
||||
|
||||
assocsJSObject :: JSValue -> [(String, JSValue)]
|
||||
assocsJSObject (JSObject o) = fromJSObject o
|
||||
assocsJSObject (JSArray _) = fail $ "CanonicalJSON.assocsJSObject: Expected a JSON object, found an Array"
|
||||
assocsJSObject jsvalue = fail $ "CanonicalJSON.assocsJSObject: Expected a JSON object, found " ++ show jsvalue
|
||||
|
||||
|
||||
readBasicJSON :: (JSON int, Integral int, JSON flt, RealFloat flt) =>
|
||||
(String -> v) -> (int -> v) -> (flt -> v) -> JSValue -> Result v
|
||||
readBasicJSON str int flt o
|
||||
= str <$> readJSON o
|
||||
<|> int_or_flt <$> readJSON o
|
||||
where int_or_flt f | f == fromIntegral n = int n
|
||||
| otherwise = flt f
|
||||
where n = round f
|
||||
|
||||
Reference in New Issue
Block a user