Tests for parsing value expressions

> {-# LANGUAGE OverloadedStrings #-}
> module Language.SQL.SimpleSQL.ValueExprs (valueExprTests) where

> import Language.SQL.SimpleSQL.TestTypes
> import Language.SQL.SimpleSQL.Syntax

> valueExprTests :: TestItem
> valueExprTests = Group "valueExprTests"
>     [literals
>     ,identifiers
>     ,star
>     ,parameter
>     ,dots
>     ,app
>     ,caseexp
>     ,operators
>     ,parens
>     ,subqueries
>     ,aggregates
>     ,windowFunctions
>     ]

> literals :: TestItem
> literals = Group "literals" $ map (uncurry TestValueExpr)
>     [("3", NumLit "3")
>      ,("3.", NumLit "3.")
>      ,("3.3", NumLit "3.3")
>      ,(".3", NumLit ".3")
>      ,("3.e3", NumLit "3.e3")
>      ,("3.3e3", NumLit "3.3e3")
>      ,(".3e3", NumLit ".3e3")
>      ,("3e3", NumLit "3e3")
>      ,("3e+3", NumLit "3e+3")
>      ,("3e-3", NumLit "3e-3")
>      ,("'string'", StringLit "string")
>      ,("'string with a '' quote'", StringLit "string with a ' quote")
>      ,("'1'", StringLit "1")
>      ,("interval '3' day", IntervalLit "3" "day" Nothing)
>      ,("interval '3' day (3)", IntervalLit "3" "day" $ Just 3)
>      ,("interval '3 weeks'", TypedLit (TypeName "interval") "3 weeks")
>     ]

> identifiers :: TestItem
> identifiers = Group "identifiers" $ map (uncurry TestValueExpr)
>     [("iden1", Iden "iden1")
>     --,("t.a", Iden2 "t" "a")
>     ,("\"quoted identifier\"", Iden $ QName "quoted identifier")
>     ]

> star :: TestItem
> star = Group "star" $ map (uncurry TestValueExpr)
>     [("*", Star)
>     --,("t.*", Star2 "t")
>     --,("ROW(t.*,42)", App "ROW" [Star2 "t", NumLit "42"])
>     ]

> parameter :: TestItem
> parameter = Group "parameter" $ map (uncurry TestValueExpr)
>     [("?", Parameter)
>     ]


> dots :: TestItem
> dots = Group "dot" $ map (uncurry TestValueExpr)
>     [("t.a", BinOp (Iden "t") "." (Iden "a"))
>     ,("t.*", BinOp (Iden "t") "." Star)
>     ,("a.b.c", BinOp (BinOp (Iden "a") "." (Iden "b")) "." (Iden "c"))
>     ,("ROW(t.*,42)", App "ROW" [BinOp (Iden "t") "." Star, NumLit "42"])
>     ]

> app :: TestItem
> app = Group "app" $ map (uncurry TestValueExpr)
>     [("f()", App "f" [])
>     ,("f(a)", App "f" [Iden "a"])
>     ,("f(a,b)", App "f" [Iden "a", Iden "b"])
>     ]

> caseexp :: TestItem
> caseexp = Group "caseexp" $ map (uncurry TestValueExpr)
>     [("case a when 1 then 2 end"
>      ,Case (Just $ Iden "a") [([NumLit "1"]
>                               ,NumLit "2")] Nothing)

>     ,("case a when 1 then 2 when 3 then 4 end"
>      ,Case (Just $ Iden "a") [([NumLit "1"], NumLit "2")
>                              ,([NumLit "3"], NumLit "4")] Nothing)

>     ,("case a when 1 then 2 when 3 then 4 else 5 end"
>      ,Case (Just $ Iden "a") [([NumLit "1"], NumLit "2")
>                              ,([NumLit "3"], NumLit "4")]
>                              (Just $ NumLit "5"))

>     ,("case when a=1 then 2 when a=3 then 4 else 5 end"
>      ,Case Nothing [([BinOp (Iden "a") "=" (NumLit "1")], NumLit "2")
>                    ,([BinOp (Iden "a") "=" (NumLit "3")], NumLit "4")]
>                    (Just $ NumLit "5"))

>     ,("case a when 1,2 then 10 when 3,4 then 20 end"
>      ,Case (Just $ Iden "a") [([NumLit "1",NumLit "2"]
>                                ,NumLit "10")
>                              ,([NumLit "3",NumLit "4"]
>                                ,NumLit "20")]
>                              Nothing)

>     ]

> operators :: TestItem
> operators = Group "operators"
>     [binaryOperators
>     ,unaryOperators
>     ,casts
>     ,miscOps]

> binaryOperators :: TestItem
> binaryOperators = Group "binaryOperators" $ map (uncurry TestValueExpr)
>     [("a + b", BinOp (Iden "a") "+" (Iden "b"))
>      -- sanity check fixities
>      -- todo: add more fixity checking

>     ,("a + b * c"
>      ,BinOp  (Iden "a") "+"
>              (BinOp (Iden "b") "*" (Iden "c")))

>     ,("a * b + c"
>      ,BinOp (BinOp (Iden "a") "*" (Iden "b"))
>             "+" (Iden "c"))
>     ]

> unaryOperators :: TestItem
> unaryOperators = Group "unaryOperators" $ map (uncurry TestValueExpr)
>     [("not a", PrefixOp "not" $ Iden "a")
>      -- I think this is a missing feature or bug in parsec buildExpressionParser
>     --,("not not a", PrefixOp "not" $ PrefixOp "not" $ Iden "a")
>     ,("+a", PrefixOp "+" $ Iden "a")
>     ,("-a", PrefixOp "-" $ Iden "a")
>     ]


> casts :: TestItem
> casts = Group "operators" $ map (uncurry TestValueExpr)
>     [("cast('1' as int)"
>      ,Cast (StringLit "1") $ TypeName "int")

>     ,("int '3'"
>      ,TypedLit (TypeName "int") "3")

>     ,("cast('1' as double precision)"
>      ,Cast (StringLit "1") $ TypeName "double precision")

>     ,("cast('1' as float(8))"
>      ,Cast (StringLit "1") $ PrecTypeName "float" 8)

>     ,("cast('1' as decimal(15,2))"
>      ,Cast (StringLit "1") $ PrecScaleTypeName "decimal" 15 2)


>     ,("double precision '3'"
>      ,TypedLit (TypeName "double precision") "3")
>     ]

> subqueries :: TestItem
> subqueries = Group "unaryOperators" $ map (uncurry TestValueExpr)
>     [("exists (select a from t)", SubQueryExpr SqExists ms)
>     ,("(select a from t)", SubQueryExpr SqSq ms)

>     ,("a in (select a from t)"
>      ,In True (Iden "a") (InQueryExpr ms))

>     ,("a not in (select a from t)"
>      ,In False (Iden "a") (InQueryExpr ms))

>     ,("a > all (select a from t)"
>      ,BinOp (Iden "a") ">" (SubQueryExpr SqAll ms))

>     ,("a = some (select a from t)"
>      ,BinOp (Iden "a") "=" (SubQueryExpr SqSome ms))

>     ,("a <= any (select a from t)"
>      ,BinOp (Iden "a") "<=" (SubQueryExpr SqAny ms))
>     ]
>   where
>     ms = makeSelect
>          {qeSelectList = [(Iden "a",Nothing)]
>          ,qeFrom = [TRSimple "t"]
>          }

> miscOps :: TestItem
> miscOps = Group "unaryOperators" $ map (uncurry TestValueExpr)
>     [("a in (1,2,3)"
>      ,In True (Iden "a") $ InList $ map NumLit ["1","2","3"])

>     ,("a is null", PostfixOp "is null" (Iden "a"))
>     ,("a is not null", PostfixOp "is not null" (Iden "a"))
>     ,("a is true", PostfixOp "is true" (Iden "a"))
>     ,("a is not true", PostfixOp "is not true" (Iden "a"))
>     ,("a is false", PostfixOp "is false" (Iden "a"))
>     ,("a is not false", PostfixOp "is not false" (Iden "a"))
>     ,("a is unknown", PostfixOp "is unknown" (Iden "a"))
>     ,("a is not unknown", PostfixOp "is not unknown" (Iden "a"))
>     ,("a is distinct from b", BinOp (Iden "a") "is distinct from"(Iden "b"))

>     ,("a is not distinct from b"
>      ,BinOp (Iden "a") "is not distinct from" (Iden "b"))

>     ,("a like b", BinOp (Iden "a") "like" (Iden "b"))
>     ,("a not like b", BinOp (Iden "a") "not like" (Iden "b"))
>     ,("a is similar to b", BinOp (Iden "a") "is similar to" (Iden "b"))

>     ,("a is not similar to b"
>      ,BinOp (Iden "a") "is not similar to" (Iden "b"))

>     ,("a overlaps b", BinOp (Iden "a") "overlaps" (Iden "b"))


special operators

>     ,("a between b and c", SpecialOp "between" [Iden "a"
>                                                ,Iden "b"
>                                                ,Iden "c"])

>     ,("a not between b and c", SpecialOp "not between" [Iden "a"
>                                                        ,Iden "b"
>                                                        ,Iden "c"])
>     ,("(1,2)"
>      ,SpecialOp "rowctor" [NumLit "1", NumLit "2"])


keyword special operators

>     ,("extract(day from t)"
>      , SpecialOpK "extract" (Just $ Iden "day") [("from", Iden "t")])

>     ,("substring(x from 1 for 2)"
>      ,SpecialOpK "substring" (Just $ Iden "x") [("from", NumLit "1")
>                                                ,("for", NumLit "2")])

>     ,("substring(x from 1)"
>      ,SpecialOpK "substring" (Just $ Iden "x") [("from", NumLit "1")])

>     ,("substring(x for 2)"
>      ,SpecialOpK "substring" (Just $ Iden "x") [("for", NumLit "2")])

>     ,("substring(x from 1 for 2 collate 'C')"
>      ,SpecialOpK "substring" (Just $ Iden "x") [("from", NumLit "1")
>                                                ,("for", NumLit "2")
>                                                ,("collate", StringLit "C")])

this doesn't work because of a overlap in the 'in' parser

>     ,("POSITION( string1 IN string2 )"
>      ,SpecialOpK "position" (Just $ Iden "string1") [("in", Iden "string2")])

>     ,("CONVERT(char_value USING conversion_char_name)"
>      ,SpecialOpK "convert" (Just $ Iden "char_value")
>           [("using", Iden "conversion_char_name")])

>     ,("TRANSLATE(char_value USING translation_name)"
>      ,SpecialOpK "translate" (Just $ Iden "char_value")
>           [("using", Iden "translation_name")])

OVERLAY(string PLACING embedded_string FROM start
[FOR length])

>     ,("OVERLAY(string PLACING embedded_string FROM start)"
>      ,SpecialOpK "overlay" (Just $ Iden "string")
>           [("placing", Iden "embedded_string")
>           ,("from", Iden "start")])

>     ,("OVERLAY(string PLACING embedded_string FROM start FOR length)"
>      ,SpecialOpK "overlay" (Just $ Iden "string")
>           [("placing", Iden "embedded_string")
>           ,("from", Iden "start")
>           ,("for", Iden "length")])

TRIM( [ [{LEADING | TRAILING | BOTH}] [removal_char] FROM ]
target_string
[COLLATE collation_name] )



>     ,("trim(from target_string)"
>      ,SpecialOpK "trim" Nothing
>           [("both", StringLit " ")
>           ,("from", Iden "target_string")])

>     ,("trim(leading from target_string)"
>      ,SpecialOpK "trim" Nothing
>           [("leading", StringLit " ")
>           ,("from", Iden "target_string")])

>     ,("trim(trailing from target_string)"
>      ,SpecialOpK "trim" Nothing
>           [("trailing", StringLit " ")
>           ,("from", Iden "target_string")])

>     ,("trim(both from target_string)"
>      ,SpecialOpK "trim" Nothing
>           [("both", StringLit " ")
>           ,("from", Iden "target_string")])


>     ,("trim(leading 'x' from target_string)"
>      ,SpecialOpK "trim" Nothing
>           [("leading", StringLit "x")
>           ,("from", Iden "target_string")])

>     ,("trim(trailing 'y' from target_string)"
>      ,SpecialOpK "trim" Nothing
>           [("trailing", StringLit "y")
>           ,("from", Iden "target_string")])

>     ,("trim(both 'z' from target_string collate 'C')"
>      ,SpecialOpK "trim" Nothing
>           [("both", StringLit "z")
>           ,("from", Iden "target_string")
>           ,("collate", StringLit "C")])

>     ,("trim(leading from target_string)"
>      ,SpecialOpK "trim" Nothing
>           [("leading", StringLit " ")
>           ,("from", Iden "target_string")])


>     ]

> aggregates :: TestItem
> aggregates = Group "aggregates" $ map (uncurry TestValueExpr)
>     [("count(*)",App "count" [Star])

>     ,("sum(a order by a)"
>     ,AggregateApp "sum" Nothing [Iden "a"]
>                   [SortSpec (Iden "a") Asc NullsOrderDefault])

>     ,("sum(all a)"
>     ,AggregateApp "sum" (Just All) [Iden "a"] [])

>     ,("count(distinct a)"
>     ,AggregateApp "count" (Just Distinct) [Iden "a"] [])
>     ]

> windowFunctions :: TestItem
> windowFunctions = Group "windowFunctions" $ map (uncurry TestValueExpr)
>     [("max(a) over ()", WindowApp "max" [Iden "a"] [] [] Nothing)
>     ,("count(*) over ()", WindowApp "count" [Star] [] [] Nothing)

>     ,("max(a) over (partition by b)"
>      ,WindowApp "max" [Iden "a"] [Iden "b"] [] Nothing)

>     ,("max(a) over (partition by b,c)"
>      ,WindowApp "max" [Iden "a"] [Iden "b",Iden "c"] [] Nothing)

>     ,("sum(a) over (order by b)"
>      ,WindowApp "sum" [Iden "a"] []
>           [SortSpec (Iden "b") Asc NullsOrderDefault] Nothing)

>     ,("sum(a) over (order by b desc,c)"
>      ,WindowApp "sum" [Iden "a"] []
>           [SortSpec (Iden "b") Desc NullsOrderDefault
>           ,SortSpec (Iden "c") Asc NullsOrderDefault] Nothing)

>     ,("sum(a) over (partition by b order by c)"
>      ,WindowApp "sum" [Iden "a"] [Iden "b"]
>           [SortSpec (Iden "c") Asc NullsOrderDefault] Nothing)

>     ,("sum(a) over (partition by b order by c range unbounded preceding)"
>      ,WindowApp "sum" [Iden "a"] [Iden "b"]
>       [SortSpec (Iden "c") Asc NullsOrderDefault]
>       $ Just $ FrameFrom FrameRange UnboundedPreceding)

>     ,("sum(a) over (partition by b order by c range 5 preceding)"
>      ,WindowApp "sum" [Iden "a"] [Iden "b"]
>       [SortSpec (Iden "c") Asc NullsOrderDefault]
>       $ Just $ FrameFrom FrameRange $ Preceding (NumLit "5"))

>     ,("sum(a) over (partition by b order by c range current row)"
>      ,WindowApp "sum" [Iden "a"] [Iden "b"]
>       [SortSpec (Iden "c") Asc NullsOrderDefault]
>       $ Just $ FrameFrom FrameRange Current)

>     ,("sum(a) over (partition by b order by c rows 5 following)"
>      ,WindowApp "sum" [Iden "a"] [Iden "b"]
>       [SortSpec (Iden "c") Asc NullsOrderDefault]
>       $ Just $ FrameFrom FrameRows $ Following (NumLit "5"))

>     ,("sum(a) over (partition by b order by c range unbounded following)"
>      ,WindowApp "sum" [Iden "a"] [Iden "b"]
>       [SortSpec (Iden "c") Asc NullsOrderDefault]
>       $ Just $ FrameFrom FrameRange UnboundedFollowing)

>     ,("sum(a) over (partition by b order by c \n\
>       \range between 5 preceding and 5 following)"
>      ,WindowApp "sum" [Iden "a"] [Iden "b"]
>       [SortSpec (Iden "c") Asc NullsOrderDefault]
>       $ Just $ FrameBetween FrameRange
>                             (Preceding (NumLit "5"))
>                             (Following (NumLit "5")))

>     ]

> parens :: TestItem
> parens = Group "parens" $ map (uncurry TestValueExpr)
>     [("(a)", Parens (Iden "a"))
>     ,("(a + b)", Parens (BinOp (Iden "a") "+" (Iden "b")))
>     ]