Safe Haskell	Safe
Language	Haskell98

Text.JSON.Types

Contents

JSON Types
Wrapper Types

Description

Basic support for working with JSON values.

Synopsis

data JSValue
- = JSNull
- | JSBool !Bool
- | JSRational Bool !Rational
- | JSString JSString
- | JSArray [JSValue]
- | JSObject (JSObject JSValue)
newtype JSString = JSONString {
- fromJSString :: String
}
toJSString :: String -> JSString
newtype JSObject e = JSONObject {
- fromJSObject :: [(String, e)]
}
toJSObject :: [(String, a)] -> JSObject a
get_field :: JSObject a -> String -> Maybe a
set_field :: JSObject a -> String -> a -> JSObject a

JSON Types

data JSValue Source #

JSON values

The type to which we encode Haskell values. There's a set of primitives, and a couple of heterogenous collection types.

Objects:

An object structure is represented as a pair of curly brackets surrounding zero or more name/value pairs (or members). A name is a string. A single colon comes after each name, separating the name from the value. A single comma separates a value from a following name.

Arrays:

An array structure is represented as square brackets surrounding zero or more values (or elements). Elements are separated by commas.

Only valid JSON can be constructed this way

Constructors

JSNull
JSBool !Bool
JSRational Bool !Rational
JSString JSString
JSArray [JSValue]
JSObject (JSObject JSValue)

Instances

Eq JSValue Source #
Instance details Defined in Text.JSON.Types Methods (==) :: JSValue -> JSValue -> Bool # (/=) :: JSValue -> JSValue -> Bool #
Ord JSValue Source #
Instance details Defined in Text.JSON.Types Methods compare :: JSValue -> JSValue -> Ordering # (<) :: JSValue -> JSValue -> Bool # (<=) :: JSValue -> JSValue -> Bool # (>) :: JSValue -> JSValue -> Bool # (>=) :: JSValue -> JSValue -> Bool # max :: JSValue -> JSValue -> JSValue # min :: JSValue -> JSValue -> JSValue #
Read JSValue Source #
Instance details Defined in Text.JSON.Types Methods readsPrec :: Int -> ReadS JSValue # readList :: ReadS [JSValue] # readPrec :: ReadPrec JSValue # readListPrec :: ReadPrec [JSValue] #
Show JSValue Source #
Instance details Defined in Text.JSON.Types Methods showsPrec :: Int -> JSValue -> ShowS # show :: JSValue -> String # showList :: [JSValue] -> ShowS #
IsString JSValue Source #
Instance details Defined in Text.JSON.Types Methods fromString :: String -> JSValue #
JSON JSValue Source #	To ensure we generate valid JSON, we map Haskell types to JSValue internally, then pretty print that.
Instance details Defined in Text.JSON Methods readJSON :: JSValue -> Result JSValue Source # showJSON :: JSValue -> JSValue Source # readJSONs :: JSValue -> Result [JSValue] Source # showJSONs :: [JSValue] -> JSValue Source #

Wrapper Types

newtype JSString Source #

Strings can be represented a little more efficiently in JSON

Constructors

JSONString
Fields fromJSString :: String

Instances

Eq JSString Source #
Instance details Defined in Text.JSON.Types Methods (==) :: JSString -> JSString -> Bool # (/=) :: JSString -> JSString -> Bool #
Ord JSString Source #
Instance details Defined in Text.JSON.Types Methods compare :: JSString -> JSString -> Ordering # (<) :: JSString -> JSString -> Bool # (<=) :: JSString -> JSString -> Bool # (>) :: JSString -> JSString -> Bool # (>=) :: JSString -> JSString -> Bool # max :: JSString -> JSString -> JSString # min :: JSString -> JSString -> JSString #
Read JSString Source #
Instance details Defined in Text.JSON.Types Methods readsPrec :: Int -> ReadS JSString # readList :: ReadS [JSString] # readPrec :: ReadPrec JSString # readListPrec :: ReadPrec [JSString] #
Show JSString Source #
Instance details Defined in Text.JSON.Types Methods showsPrec :: Int -> JSString -> ShowS # show :: JSString -> String # showList :: [JSString] -> ShowS #
IsString JSString Source #
Instance details Defined in Text.JSON.Types Methods fromString :: String -> JSString #
JSKey JSString Source #
Instance details Defined in Text.JSON Methods toJSKey :: JSString -> String Source # fromJSKey :: String -> Maybe JSString Source #
JSON JSString Source #
Instance details Defined in Text.JSON Methods readJSON :: JSValue -> Result JSString Source # showJSON :: JSString -> JSValue Source # readJSONs :: JSValue -> Result [JSString] Source # showJSONs :: [JSString] -> JSValue Source #

toJSString :: String -> JSString Source #

Turn a Haskell string into a JSON string.

newtype JSObject e Source #

As can association lists

Constructors

JSONObject
Fields fromJSObject :: [(String, e)]

Instances

Eq e => Eq (JSObject e) Source #
Instance details Defined in Text.JSON.Types Methods (==) :: JSObject e -> JSObject e -> Bool # (/=) :: JSObject e -> JSObject e -> Bool #
Ord e => Ord (JSObject e) Source #
Instance details Defined in Text.JSON.Types Methods compare :: JSObject e -> JSObject e -> Ordering # (<) :: JSObject e -> JSObject e -> Bool # (<=) :: JSObject e -> JSObject e -> Bool # (>) :: JSObject e -> JSObject e -> Bool # (>=) :: JSObject e -> JSObject e -> Bool # max :: JSObject e -> JSObject e -> JSObject e # min :: JSObject e -> JSObject e -> JSObject e #
Read e => Read (JSObject e) Source #
Instance details Defined in Text.JSON.Types Methods readsPrec :: Int -> ReadS (JSObject e) # readList :: ReadS [JSObject e] # readPrec :: ReadPrec (JSObject e) # readListPrec :: ReadPrec [JSObject e] #
Show e => Show (JSObject e) Source #
Instance details Defined in Text.JSON.Types Methods showsPrec :: Int -> JSObject e -> ShowS # show :: JSObject e -> String # showList :: [JSObject e] -> ShowS #
JSON a => JSON (JSObject a) Source #
Instance details Defined in Text.JSON Methods readJSON :: JSValue -> Result (JSObject a) Source # showJSON :: JSObject a -> JSValue Source # readJSONs :: JSValue -> Result [JSObject a] Source # showJSONs :: [JSObject a] -> JSValue Source #

toJSObject :: [(String, a)] -> JSObject a Source #

Make JSON object out of an association list.

get_field :: JSObject a -> String -> Maybe a Source #

Get the value of a field, if it exist.

set_field :: JSObject a -> String -> a -> JSObject a Source #

Set the value of a field. Previous values are overwritten.