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add documentation to the Core module
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-- | The Core module gathers types used across the library and provides basic Show instances for
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-- | those types.
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-- |
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-- | NOTE:
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-- | Errors normally thrown by the IDB* interfaces are wrapped in the `Aff` Monad as `Error`
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-- | where the `message` corresponds to the error's name (e.g. "InvalidStateError").
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-- | Pattern matching can therefore be done on any error message to handle specific errors thrown
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-- | by the API.
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module Database.IndexedDB.Core
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( class FromString, parse
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, IDB
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@ -22,43 +31,85 @@ import Data.Maybe (Maybe(..))
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import Database.IndexedDB.IDBKey
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-- | IDB Effects, manifestation that something happened with the IndexedDB
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foreign import data IDB :: Effect
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data CursorDirection = Next | NextUnique | Prev | PrevUnique
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-- | A cursor has a direction that determines whether it moves in monotonically
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-- | increasing or decreasing order of the record keys when iterated, and if it
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-- | skips duplicated values when iterating indexes.
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-- | The direction of a cursor also determines if the cursor initial position is at
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-- | the start of its source or at its end.
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data CursorDirection
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= Next
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| NextUnique
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| Prev
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| PrevUnique
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data CursorSource = ObjectStore ObjectStore | Index Index
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-- | If the source of a cursor is an object store, the effective object store of
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-- | the cursor is that object store and the effective key of the cursor is the
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-- | cursor’s position. If the source of a cursor is an index, the effective object
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-- | store of the cursor is that index’s referenced object store and the effective key
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-- | is the cursor’s object store position.
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data CursorSource
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= ObjectStore ObjectStore
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| Index Index
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data TransactionMode = ReadOnly | ReadWrite | VersionChange
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-- | A transaction has a mode that determines which types of interactions can be performed
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-- | upon that transaction. The mode is set when the transaction is created and remains
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-- | fixed for the life of the transaction.
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data TransactionMode
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= ReadOnly -- ^ The transaction is only allowed to read data.
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| ReadWrite -- ^ The transaction is allowed to read, modify and delete data from existing object stores
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| VersionChange -- ^ The transaction is allowed to read, modify and delete data from existing object stores, and can also create and remove object stores and indexes.
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type KeyPath = Array String
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-- | A key path is a list of strings that defines how to extract a key from a value.
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-- | A valid key path is one of:
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-- |
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-- | - An empty list.
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-- | - An singleton identifier, which is a string matching the IdentifierName production from the ECMAScript Language Specification [ECMA-262].
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-- | - A singleton string consisting of two or more identifiers separated by periods (U+002E FULL STOP).
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-- | - A non-empty list containing only strings conforming to the above requirements.
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type KeyPath = Array String
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-- | Each origin has an associated set of databases. A database has zero or more object
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-- | stores which hold the data stored in the database.
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foreign import data Database :: Type
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-- | An index allows looking up records in an object store using properties of the values
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-- | in the object stores records.
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foreign import data Index :: Type
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-- | A cursor is used to iterate over a range of records in an index or an object store
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-- | in a specific direction. A KeyCursor doesn't hold any value.
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foreign import data KeyCursor :: Type
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-- | A key range is a continuous interval over some data type used for keys.
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foreign import data KeyRange :: Type
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-- | An object store is the primary storage mechanism for storing data in a database.
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foreign import data ObjectStore :: Type
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-- | A Transaction is used to interact with the data in a database.
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-- | Whenever data is read or written to the database it is done by using a transaction.
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foreign import data Transaction :: Type
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-- | A cursor is used to iterate over a range of records in an index or an object store
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-- | in a specific direction. A ValueCursor also holds the value corresponding to matching key.
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foreign import data ValueCursor :: Type
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-- | FromString represents enumerations that can be represented as Strings.
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class FromString a where
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parse :: String -> Maybe a
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@ -72,27 +123,37 @@ instance showValueCursor :: Show ValueCursor where
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show = _showCursor
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foreign import _showDatabase :: Database -> String
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foreign import _showDatabase
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:: Database
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-> String
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instance showDatabase :: Show Database where
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show = _showDatabase
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foreign import _showIndex :: Index -> String
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foreign import _showIndex
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:: Index
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-> String
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instance showIndex :: Show Index where
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show = _showIndex
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foreign import _showKeyRange :: KeyRange -> String
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foreign import _showKeyRange
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:: KeyRange
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-> String
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instance showKeyRange :: Show KeyRange where
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show = _showKeyRange
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foreign import _showObjectStore :: ObjectStore -> String
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foreign import _showObjectStore
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:: ObjectStore
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-> String
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instance showObjectStore :: Show ObjectStore where
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show = _showObjectStore
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foreign import _showTransaction :: Transaction -> String
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foreign import _showTransaction
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:: Transaction
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-> String
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instance showTransaction :: Show Transaction where
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show = _showTransaction
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