658 lines
21 KiB
Plaintext
658 lines
21 KiB
Plaintext
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> -- | The AST for SQL.
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> {-# LANGUAGE DeriveDataTypeable #-}
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> module Language.SQL.SimpleSQL.Syntax
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> (-- * Value expressions
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> ValueExpr(..)
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> ,Name(..)
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> ,TypeName(..)
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> ,IntervalTypeField(..)
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> ,PrecMultiplier(..)
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> ,PrecUnits(..)
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> ,SetQuantifier(..)
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> ,SortSpec(..)
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> ,Direction(..)
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> ,NullsOrder(..)
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> ,InPredValue(..)
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> ,SubQueryExprType(..)
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> ,CompPredQuantifier(..)
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> ,Frame(..)
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> ,FrameRows(..)
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> ,FramePos(..)
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> -- * Query expressions
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> ,QueryExpr(..)
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> ,makeSelect
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> ,CombineOp(..)
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> ,Corresponding(..)
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> ,Alias(..)
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> ,GroupingExpr(..)
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> -- ** From
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> ,TableRef(..)
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> ,JoinType(..)
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> ,JoinCondition(..)
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> -- * Statements
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> ,Statement(..)
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> ,DropBehaviour(..)
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> ,IdentityRestart(..)
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> ,InsertSource(..)
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> ,SetClause(..)
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> ,TableElement(..)
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> ,ColumnDef(..)
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> ,DefaultClause(..)
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> ,IdentityWhen(..)
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> ,SequenceGeneratorOption(..)
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> ,ColConstraintDef(..)
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> ,ColConstraint(..)
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> ,TableConstraint(..)
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> ,ReferenceMatch(..)
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> ,ReferentialAction(..)
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> ,AlterTableAction(..)
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> ,CheckOption(..)
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> ,AlterDomainAction(..)
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> -- * Dialect
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> ,Dialect(..)
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> -- * Comment
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> ,Comment(..)
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> ) where
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> import Data.Data
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> -- | Represents a value expression. This is used for the expressions
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> -- in select lists. It is also used for expressions in where, group
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> -- by, having, order by and so on.
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> data ValueExpr
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> = -- | a numeric literal optional decimal point, e+-
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> -- integral exponent, e.g
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> --
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> -- * 10
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> --
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> -- * 10.
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> --
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> -- * .1
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> --
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> -- * 10.1
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> --
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> -- * 1e5
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> --
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> -- * 12.34e-6
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> NumLit String
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> -- | string literal, currently only basic strings between
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> -- single quotes with a single quote escaped using ''
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> | StringLit String
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> -- | text of interval literal, units of interval precision,
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> -- e.g. interval 3 days (3)
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> | IntervalLit
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> {ilSign :: Maybe Bool -- ^ true if + used, false if - used
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> ,ilLiteral :: String -- ^ literal text
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> ,ilFrom :: IntervalTypeField
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> ,ilTo :: Maybe IntervalTypeField
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> }
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> -- | identifier with parts separated by dots
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> | Iden [Name]
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> -- | star, as in select *, t.*, count(*)
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> | Star
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> -- | function application (anything that looks like c style
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> -- function application syntactically)
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> | App [Name] [ValueExpr]
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> -- | aggregate application, which adds distinct or all, and
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> -- order by, to regular function application
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> | AggregateApp
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> {aggName :: [Name] -- ^ aggregate function name
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> ,aggDistinct :: SetQuantifier -- ^ distinct
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> ,aggArgs :: [ValueExpr]-- ^ args
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> ,aggOrderBy :: [SortSpec] -- ^ order by
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> ,aggFilter :: Maybe ValueExpr -- ^ filter
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> }
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> -- | aggregates with within group
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> | AggregateAppGroup
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> {aggName :: [Name] -- ^ aggregate function name
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> ,aggArgs :: [ValueExpr] -- ^ args
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> ,aggGroup :: [SortSpec] -- ^ within group
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> }
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> -- | window application, which adds over (partition by a order
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> -- by b) to regular function application. Explicit frames are
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> -- not currently supported
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> | WindowApp
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> {wnName :: [Name] -- ^ window function name
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> ,wnArgs :: [ValueExpr] -- ^ args
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> ,wnPartition :: [ValueExpr] -- ^ partition by
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> ,wnOrderBy :: [SortSpec] -- ^ order by
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> ,wnFrame :: Maybe Frame -- ^ frame clause
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> }
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> -- | Infix binary operators. This is used for symbol operators
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> -- (a + b), keyword operators (a and b) and multiple keyword
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> -- operators (a is similar to b)
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> | BinOp ValueExpr [Name] ValueExpr
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> -- | Prefix unary operators. This is used for symbol
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> -- operators, keyword operators and multiple keyword operators.
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> | PrefixOp [Name] ValueExpr
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> -- | Postfix unary operators. This is used for symbol
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> -- operators, keyword operators and multiple keyword operators.
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> | PostfixOp [Name] ValueExpr
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> -- | Used for ternary, mixfix and other non orthodox
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> -- operators. Currently used for row constructors, and for
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> -- between.
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> | SpecialOp [Name] [ValueExpr]
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> -- | Used for the operators which look like functions
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> -- except the arguments are separated by keywords instead
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> -- of commas. The maybe is for the first unnamed argument
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> -- if it is present, and the list is for the keyword argument
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> -- pairs.
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> | SpecialOpK [Name] (Maybe ValueExpr) [(String,ValueExpr)]
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> -- | case expression. both flavours supported
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> | Case
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> {caseTest :: Maybe ValueExpr -- ^ test value
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> ,caseWhens :: [([ValueExpr],ValueExpr)] -- ^ when branches
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> ,caseElse :: Maybe ValueExpr -- ^ else value
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> }
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> | Parens ValueExpr
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> -- | cast(a as typename)
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> | Cast ValueExpr TypeName
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> -- | prefix 'typed literal', e.g. int '42'
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> | TypedLit TypeName String
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> -- | exists, all, any, some subqueries
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> | SubQueryExpr SubQueryExprType QueryExpr
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> -- | in list literal and in subquery, if the bool is false it
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> -- means not in was used ('a not in (1,2)')
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> | In Bool ValueExpr InPredValue
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> | Parameter -- ^ Represents a ? in a parameterized query
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> | HostParameter String (Maybe String) -- ^ represents a host
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> -- parameter, e.g. :a. The
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> -- Maybe String is for the
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> -- indicator, e.g. :var
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> -- indicator :nl
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> | QuantifiedComparison
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> ValueExpr
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> [Name] -- operator
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> CompPredQuantifier
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> QueryExpr
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> | Match ValueExpr Bool -- true if unique
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> QueryExpr
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> | Array ValueExpr [ValueExpr] -- ^ represents an array
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> -- access expression, or an array ctor
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> -- e.g. a[3]. The first
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> -- valueExpr is the array, the
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> -- second is the subscripts/ctor args
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> | ArrayCtor QueryExpr -- ^ this is used for the query expression version of array constructors, e.g. array(select * from t)
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> | CSStringLit String String
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> | Escape ValueExpr Char
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> | UEscape ValueExpr Char
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> | Collate ValueExpr [Name]
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> | MultisetBinOp ValueExpr CombineOp SetQuantifier ValueExpr
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> | MultisetCtor [ValueExpr]
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> | MultisetQueryCtor QueryExpr
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> | NextValueFor [Name]
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> | VEComment [Comment] ValueExpr
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | Represents an identifier name, which can be quoted or unquoted.
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> data Name = Name String
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> | QName String
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> | UQName String
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> | DQName String String String
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> -- ^ dialect quoted name, the fields are start quote, end quote and the string itself, e.g. `something` is parsed to DQName "`" "`" "something, and $a$ test $a$ is parsed to DQName "$a$" "$a" " test "
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | Represents a type name, used in casts.
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> data TypeName
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> = TypeName [Name]
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> | PrecTypeName [Name] Integer
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> | PrecScaleTypeName [Name] Integer Integer
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> | PrecLengthTypeName [Name] Integer (Maybe PrecMultiplier) (Maybe PrecUnits)
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> -- precision, characterset, collate
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> | CharTypeName [Name] (Maybe Integer) [Name] [Name]
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> | TimeTypeName [Name] (Maybe Integer) Bool -- true == with time zone
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> | RowTypeName [(Name,TypeName)]
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> | IntervalTypeName IntervalTypeField (Maybe IntervalTypeField)
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> | ArrayTypeName TypeName (Maybe Integer)
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> | MultisetTypeName TypeName
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> deriving (Eq,Show,Read,Data,Typeable)
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> data IntervalTypeField = Itf String (Maybe (Integer, Maybe Integer))
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> deriving (Eq,Show,Read,Data,Typeable)
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> data PrecMultiplier = PrecK | PrecM | PrecG | PrecT | PrecP
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> deriving (Eq,Show,Read,Data,Typeable)
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> data PrecUnits = PrecCharacters
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> | PrecOctets
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | Used for 'expr in (value expression list)', and 'expr in
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> -- (subquery)' syntax.
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> data InPredValue = InList [ValueExpr]
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> | InQueryExpr QueryExpr
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> deriving (Eq,Show,Read,Data,Typeable)
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not sure if scalar subquery, exists and unique should be represented like this
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> -- | A subquery in a value expression.
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> data SubQueryExprType
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> = -- | exists (query expr)
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> SqExists
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> -- | unique (query expr)
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> | SqUnique
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> -- | a scalar subquery
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> | SqSq
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> deriving (Eq,Show,Read,Data,Typeable)
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> data CompPredQuantifier
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> = CPAny
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> | CPSome
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> | CPAll
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | Represents one field in an order by list.
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> data SortSpec = SortSpec ValueExpr Direction NullsOrder
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | Represents 'nulls first' or 'nulls last' in an order by clause.
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> data NullsOrder = NullsOrderDefault
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> | NullsFirst
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> | NullsLast
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | Represents the frame clause of a window
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> -- this can be [range | rows] frame_start
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> -- or [range | rows] between frame_start and frame_end
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> data Frame = FrameFrom FrameRows FramePos
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> | FrameBetween FrameRows FramePos FramePos
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | Represents whether a window frame clause is over rows or ranges.
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> data FrameRows = FrameRows | FrameRange
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | represents the start or end of a frame
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> data FramePos = UnboundedPreceding
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> | Preceding ValueExpr
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> | Current
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> | Following ValueExpr
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> | UnboundedFollowing
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | Represents a query expression, which can be:
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> --
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> -- * a regular select;
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> --
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> -- * a set operator (union, except, intersect);
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> --
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> -- * a common table expression (with);
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> --
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> -- * a table value constructor (values (1,2),(3,4)); or
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> --
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> -- * an explicit table (table t).
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> data QueryExpr
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> = Select
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> {qeSetQuantifier :: SetQuantifier
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> ,qeSelectList :: [(ValueExpr,Maybe Name)]
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> -- ^ the expressions and the column aliases
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TODO: consider breaking this up. The SQL grammar has
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queryexpr = select <select list> [<table expression>]
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table expression = <from> [where] [groupby] [having] ...
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This would make some things a bit cleaner?
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> ,qeFrom :: [TableRef]
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> ,qeWhere :: Maybe ValueExpr
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> ,qeGroupBy :: [GroupingExpr]
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> ,qeHaving :: Maybe ValueExpr
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> ,qeOrderBy :: [SortSpec]
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> ,qeOffset :: Maybe ValueExpr
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> ,qeFetchFirst :: Maybe ValueExpr
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> }
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> | CombineQueryExpr
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> {qe0 :: QueryExpr
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> ,qeCombOp :: CombineOp
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> ,qeSetQuantifier :: SetQuantifier
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> ,qeCorresponding :: Corresponding
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> ,qe1 :: QueryExpr
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> }
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> | With
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> {qeWithRecursive :: Bool
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> ,qeViews :: [(Alias,QueryExpr)]
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> ,qeQueryExpression :: QueryExpr}
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> | Values [[ValueExpr]]
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> | Table [Name]
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> | QEComment [Comment] QueryExpr
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> deriving (Eq,Show,Read,Data,Typeable)
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TODO: add queryexpr parens to deal with e.g.
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(select 1 union select 2) union select 3
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I'm not sure if this is valid syntax or not.
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> -- | Helper/'default' value for query exprs to make creating query
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> -- expr values a little easier. It is defined like this:
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> --
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> -- > makeSelect :: QueryExpr
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> -- > makeSelect = Select {qeSetQuantifier = SQDefault
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> -- > ,qeSelectList = []
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> -- > ,qeFrom = []
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> -- > ,qeWhere = Nothing
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> -- > ,qeGroupBy = []
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> -- > ,qeHaving = Nothing
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> -- > ,qeOrderBy = []
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> -- > ,qeOffset = Nothing
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> -- > ,qeFetchFirst = Nothing}
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> makeSelect :: QueryExpr
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> makeSelect = Select {qeSetQuantifier = SQDefault
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> ,qeSelectList = []
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> ,qeFrom = []
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> ,qeWhere = Nothing
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> ,qeGroupBy = []
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> ,qeHaving = Nothing
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> ,qeOrderBy = []
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> ,qeOffset = Nothing
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> ,qeFetchFirst = Nothing}
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> -- | Represents the Distinct or All keywords, which can be used
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> -- before a select list, in an aggregate/window function
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> -- application, or in a query expression set operator.
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> data SetQuantifier = SQDefault | Distinct | All deriving (Eq,Show,Read,Data,Typeable)
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> -- | The direction for a column in order by.
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> data Direction = DirDefault | Asc | Desc deriving (Eq,Show,Read,Data,Typeable)
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> -- | Query expression set operators.
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> data CombineOp = Union | Except | Intersect deriving (Eq,Show,Read,Data,Typeable)
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> -- | Corresponding, an option for the set operators.
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> data Corresponding = Corresponding | Respectively deriving (Eq,Show,Read,Data,Typeable)
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> -- | Represents an item in a group by clause.
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> data GroupingExpr
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> = GroupingParens [GroupingExpr]
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> | Cube [GroupingExpr]
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> | Rollup [GroupingExpr]
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> | GroupingSets [GroupingExpr]
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> | SimpleGroup ValueExpr
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | Represents a entry in the csv of tables in the from clause.
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> data TableRef = -- | from t / from s.t
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> TRSimple [Name]
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> -- | from a join b, the bool is true if natural was used
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> | TRJoin TableRef Bool JoinType TableRef (Maybe JoinCondition)
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> -- | from (a)
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> | TRParens TableRef
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> -- | from a as b(c,d)
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> | TRAlias TableRef Alias
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> -- | from (query expr)
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> | TRQueryExpr QueryExpr
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> -- | from function(args)
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> | TRFunction [Name] [ValueExpr]
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> -- | from lateral t
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> | TRLateral TableRef
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | Represents an alias for a table valued expression, used in with
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> -- queries and in from alias, e.g. select a from t u, select a from t u(b),
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> -- with a(c) as select 1, select * from a.
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> data Alias = Alias Name (Maybe [Name])
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | The type of a join.
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> data JoinType = JInner | JLeft | JRight | JFull | JCross
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> deriving (Eq,Show,Read,Data,Typeable)
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> -- | The join condition.
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> data JoinCondition = JoinOn ValueExpr -- ^ on expr
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> | JoinUsing [Name] -- ^ using (column list)
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> deriving (Eq,Show,Read,Data,Typeable)
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---------------------------
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> data Statement =
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> -- ddl
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> CreateSchema [Name]
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> | DropSchema [Name] DropBehaviour
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> | CreateTable [Name] [TableElement]
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> | AlterTable [Name] AlterTableAction
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> | DropTable [Name] DropBehaviour
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> | CreateView Bool [Name] (Maybe [Name])
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> QueryExpr (Maybe CheckOption)
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> | DropView [Name] DropBehaviour
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> | CreateDomain [Name] TypeName (Maybe ValueExpr)
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> [(Maybe [Name], ValueExpr)]
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> | AlterDomain [Name] AlterDomainAction
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> | DropDomain [Name] DropBehaviour
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> -- probably won't do character sets, collations
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> -- and translations because I think they are too far from
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> -- reality
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> {- | CreateCharacterSet
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> | DropCharacterSet
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> | CreateCollation
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> | DropCollation
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> | CreateTranslation
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> | DropTranslation -}
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> {- | CreateAssertion
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> | DropAssertion
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> | CreateTrigger
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> | DropTrigger
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> | CreateType
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> | AlterType
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> | DropType
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> -- routine stuff? TODO
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> | CreateCast
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> | DropCast
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> | CreateOrdering
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> | DropOrdering -}
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> -- transforms
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> | CreateSequence [Name] [SequenceGeneratorOption]
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> | AlterSequence [Name] [SequenceGeneratorOption]
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> | DropSequence [Name] DropBehaviour
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> -- dml
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> | SelectStatement QueryExpr
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> {- | DeclareCursor
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> | OpenCursor
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> | FetchCursor
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> | CloseCursor
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> | SelectInto -}
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> -- | DeletePositioned
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> | Delete [Name] (Maybe Name) (Maybe ValueExpr)
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> | Truncate [Name] IdentityRestart
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> | Insert [Name] (Maybe [Name]) InsertSource
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> -- | Merge
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> | Update [Name] (Maybe Name) [SetClause] (Maybe ValueExpr)
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> {- | TemporaryTable
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> | FreeLocator
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> | HoldLocator -}
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> -- access control
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> {- | GrantPrivilege
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> | GrantRole
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> | CreateRole
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> | DropRole
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> | RevokePrivilege
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> | RevokeRole -}
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> -- transaction management
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> {- | StartTransaction
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> | SetTransaction
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> | SetContraints
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> | SavePoint
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> | ReleaseSavePoint
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> | Rollback -}
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> -- session
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> {- | SetSessionCharacteristics
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> | SetSessionAuthorization
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> | SetRole
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> | SetTimeZone
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> | SetCatalog
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> | SetSchema
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> | SetNames
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> | SetTransform
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> | SetCollation -}
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> deriving (Eq,Show,Read,Data,Typeable)
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> data DropBehaviour =
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> Restrict
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> | Cascade
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> | DefaultDropBehaviour
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> deriving (Eq,Show,Read,Data,Typeable)
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> data IdentityRestart =
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> ContinueIdentity
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> | RestartIdentity
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> | DefaultIdentityRestart
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> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data InsertSource =
|
|
> InsertQuery QueryExpr
|
|
> | DefaultInsertValues
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data SetClause =
|
|
> Set [Name] ValueExpr
|
|
> | SetMultiple [[Name]] [ValueExpr]
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data TableElement =
|
|
> TableColumnDef ColumnDef
|
|
> | TableConstraintDef (Maybe [Name]) TableConstraint
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data ColumnDef = ColumnDef Name TypeName
|
|
> (Maybe DefaultClause)
|
|
> [ColConstraintDef]
|
|
> -- (Maybe CollateClause)
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data ColConstraintDef =
|
|
> ColConstraintDef (Maybe [Name]) ColConstraint
|
|
> -- (Maybe [ConstraintCharacteristics])
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data ColConstraint =
|
|
> ColNotNullConstraint
|
|
> | ColUniqueConstraint
|
|
> | ColPrimaryKeyConstraint
|
|
> | ColReferencesConstraint [Name] (Maybe Name)
|
|
> ReferenceMatch
|
|
> ReferentialAction
|
|
> ReferentialAction
|
|
> | ColCheckConstraint ValueExpr
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data TableConstraint =
|
|
> TableUniqueConstraint [Name]
|
|
> | TablePrimaryKeyConstraint [Name]
|
|
> | TableReferencesConstraint [Name] [Name] (Maybe [Name])
|
|
> ReferenceMatch
|
|
> ReferentialAction
|
|
> ReferentialAction
|
|
> | TableCheckConstraint ValueExpr
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
|
|
> data ReferenceMatch =
|
|
> DefaultReferenceMatch
|
|
> | MatchFull
|
|
> | MatchPartial
|
|
> | MatchSimple
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data ReferentialAction =
|
|
> DefaultReferentialAction
|
|
> | RefCascade
|
|
> | RefSetNull
|
|
> | RefSetDefault
|
|
> | RefRestrict
|
|
> | RefNoAction
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data AlterTableAction =
|
|
> AddColumnDef ColumnDef
|
|
> | AlterColumnSetDefault Name ValueExpr
|
|
> | AlterColumnDropDefault Name
|
|
> | AlterColumnSetNotNull Name
|
|
> | AlterColumnDropNotNull Name
|
|
> | AlterColumnSetDataType Name TypeName
|
|
> {- | AlterColumnAlterIdentity
|
|
> | AlterColumnDropIdentity
|
|
> | AlterColumnDropColumnGeneration-}
|
|
> | DropColumn Name DropBehaviour
|
|
> | AddTableConstraintDef (Maybe [Name]) TableConstraint
|
|
> -- | AlterTableConstraintDef
|
|
> | DropTableConstraintDef [Name] DropBehaviour
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> {-data ConstraintCharacteristics =
|
|
> ConstraintCharacteristics
|
|
> ConstraintCheckTime
|
|
> Deferrable
|
|
> ConstraintEnforcement
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data ConstraintCheckTime =
|
|
> DefaultConstraintCheckTime
|
|
> | InitiallyDeferred
|
|
> | InitiallyImmeditate
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data Deferrable =
|
|
> DefaultDefferable
|
|
> | Deferrable
|
|
> | NotDeferrable
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data ConstraintEnforcement =
|
|
> DefaultConstraintEnforcement
|
|
> | Enforced
|
|
> | NotEnforced
|
|
> deriving (Eq,Show,Read,Data,Typeable) -}
|
|
|
|
> {-data TableConstraintDef
|
|
> deriving (Eq,Show,Read,Data,Typeable) -}
|
|
|
|
> data DefaultClause =
|
|
> DefaultClause ValueExpr
|
|
> | IdentityColumnSpec IdentityWhen [SequenceGeneratorOption]
|
|
> | GenerationClause ValueExpr
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data IdentityWhen =
|
|
> GeneratedAlways
|
|
> | GeneratedByDefault
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data SequenceGeneratorOption =
|
|
> SGODataType TypeName
|
|
> | SGOStartWith Integer
|
|
> | SGORestart (Maybe Integer)
|
|
> | SGOIncrementBy Integer
|
|
> | SGOMaxValue Integer
|
|
> | SGONoMaxValue
|
|
> | SGOMinValue Integer
|
|
> | SGONoMinValue
|
|
> | SGOCycle
|
|
> | SGONoCycle
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data CheckOption =
|
|
> DefaultCheckOption
|
|
> | CascadedCheckOption
|
|
> | LocalCheckOption
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
> data AlterDomainAction =
|
|
> ADSetDefault ValueExpr
|
|
> | ADDropDefault
|
|
> | ADAddConstraint (Maybe [Name]) ValueExpr
|
|
> | ADDropConstraint [Name]
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
|
|
--------------------------
|
|
|
|
> -- | Used to set the dialect used for parsing and pretty printing,
|
|
> -- very unfinished at the moment.
|
|
> data Dialect = SQL2011
|
|
> | MySQL
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|
|
|
|
> -- | Comment. Useful when generating SQL code programmatically. The
|
|
> -- parser doesn't produce these.
|
|
> data Comment = BlockComment String
|
|
> deriving (Eq,Show,Read,Data,Typeable)
|
|
|