fix the scalar expression operator parsing, use expression operator parsing for set operations too
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Jake Wheat
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7a5ad6c206
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8cc475240b
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@ -1165,38 +1165,37 @@ messages, but both of these are too important.
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-}
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opTable :: Bool -> [[E.Operator Parser ScalarExpr]]
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opTable bExpr = [] {-
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opTable bExpr =
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[-- parse match and quantified comparisons as postfix ops
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-- todo: left factor the quantified comparison with regular
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-- binary comparison, somehow
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[E.Postfix $ try quantifiedComparisonSuffix
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,E.Postfix matchPredicateSuffix
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]
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,E.Postfix matchPredicateSuffix]
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,[binarySym "." E.AssocLeft]
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,[binarySymL "."]
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,[postfix' arraySuffix
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,postfix' collateSuffix]
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,[E.Postfix arraySuffix
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,E.Postfix collateSuffix]
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,[prefixSym "+", prefixSym "-"]
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,[binarySym "^" E.AssocLeft]
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,[binarySymL "^"]
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,[binarySym "*" E.AssocLeft
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,binarySym "/" E.AssocLeft
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,binarySym "%" E.AssocLeft]
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,[binarySymL "*"
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,binarySymL "/"
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,binarySymL "%"]
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,[binarySym "+" E.AssocLeft
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,binarySym "-" E.AssocLeft]
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,[binarySymL "+"
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,binarySymL "-"]
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,[binarySym "||" E.AssocRight
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,[binarySymR "||"
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,prefixSym "~"
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,binarySym "&" E.AssocRight
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,binarySym "|" E.AssocRight]
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,binarySymR "&"
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,binarySymR "|"]
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,[binaryKeyword "overlaps" E.AssocNone]
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,[binaryKeywordN "overlaps"]
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,[binaryKeyword "like" E.AssocNone
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,[binaryKeywordN "like"
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-- have to use try with inSuffix because of a conflict
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-- with 'in' in position function, and not between
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-- between also has a try in it to deal with 'not'
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@ -1204,19 +1203,19 @@ opTable bExpr = [] {-
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,E.Postfix $ try inSuffix
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,E.Postfix betweenSuffix]
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-- todo: figure out where to put the try?
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++ [binaryKeywords $ makeKeywordTree
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++ [binaryKeywordsN $ makeKeywordTree
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["not like"
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,"is similar to"
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,"is not similar to"]]
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++ [multisetBinOp]
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++ [multisetBinOp]
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,[binarySym "<" E.AssocNone
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,binarySym ">" E.AssocNone
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,binarySym ">=" E.AssocNone
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,binarySym "<=" E.AssocNone
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,binarySym "!=" E.AssocRight
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,binarySym "<>" E.AssocRight
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,binarySym "=" E.AssocRight]
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,[binarySymN "<"
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,binarySymN ">"
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,binarySymN ">="
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,binarySymN "<="
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,binarySymR "!="
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,binarySymR "<>"
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,binarySymR "="]
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,[postfixKeywords $ makeKeywordTree
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["is null"
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@ -1227,42 +1226,44 @@ opTable bExpr = [] {-
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,"is not false"
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,"is unknown"
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,"is not unknown"]]
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++ [binaryKeywords $ makeKeywordTree
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++ [binaryKeywordsN $ makeKeywordTree
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["is distinct from"
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,"is not distinct from"]]
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,[prefixKeyword "not"]
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,if bExpr then [] else [binaryKeyword "and" E.AssocLeft]
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,if bExpr then [] else [binaryKeywordL "and"]
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,[binaryKeyword "or" E.AssocLeft]
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,[binaryKeywordL "or"]
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]
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where
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binarySym nm assoc = binary (symbol_ nm) nm assoc
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binaryKeyword nm assoc = binary (keyword_ nm) nm assoc
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binaryKeywords p =
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E.Infix (do
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binarySymL name = E.InfixL (mkBinOp name <$ symbol_ name)
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binarySymR name = E.InfixR (mkBinOp name <$ symbol_ name)
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binarySymN name = E.InfixN (mkBinOp name <$ symbol_ name)
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binaryKeywordN name = E.InfixN (mkBinOp name <$ keyword_ name)
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binaryKeywordL name = E.InfixL (mkBinOp name <$ keyword_ name)
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mkBinOp nm a b = BinOp a (mkName nm) b
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prefixSym name = E.Prefix (PrefixOp (mkName name) <$ symbol_ name)
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prefixKeyword name = E.Prefix (PrefixOp (mkName name) <$ keyword_ name)
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mkName nm = [Name Nothing nm]
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binaryKeywordsN p =
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E.InfixN (do
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o <- try p
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pure (\a b -> BinOp a [Name Nothing $ unwords o] b))
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E.AssocNone
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postfixKeywords p =
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postfix' $ do
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o <- try p
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pure $ PostfixOp [Name Nothing $ unwords o]
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binary p nm assoc =
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E.Infix (p >> pure (\a b -> BinOp a [Name Nothing nm] b)) assoc
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multisetBinOp = E.Infix (do
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pure (\a b -> BinOp a [Name Nothing $ T.unwords o] b))
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multisetBinOp = E.InfixL (do
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keyword_ "multiset"
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o <- choice [Union <$ keyword_ "union"
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,Intersect <$ keyword_ "intersect"
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,Except <$ keyword_ "except"]
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d <- option SQDefault duplicates
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pure (\a b -> MultisetBinOp a o d b))
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E.AssocLeft
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prefixKeyword nm = prefix (keyword_ nm) nm
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prefixSym nm = prefix (symbol_ nm) nm
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prefix p nm = prefix' (p >> pure (PrefixOp [Name Nothing nm]))
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postfixKeywords p =
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E.Postfix $ do
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o <- try p
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pure $ PostfixOp [Name Nothing $ T.unwords o]
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{-
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-- hack from here
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-- http://stackoverflow.com/questions/10475337/parsec-expr-repeated-prefix-postfix-operator-not-supported
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-- not implemented properly yet
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@ -1524,10 +1525,10 @@ and union, etc..
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-}
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queryExpr :: Parser QueryExpr
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queryExpr = select {-choice
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[with
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,undefined {-chainr1-} (choice [values,table, select]) setOp]-}
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queryExpr = E.makeExprParser qeterm qeOpTable
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where
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qeterm = with <|> select <|> table <|> values
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select = keyword_ "select" >>
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mkSelect
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<$> option SQDefault duplicates
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@ -1541,6 +1542,19 @@ queryExpr = select {-choice
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>> Values <$> commaSep (parens (commaSep scalarExpr))
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table = keyword_ "table" >> Table <$> names
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qeOpTable =
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[[E.InfixL $ setOp Intersect "intersect"]
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,[E.InfixL $ setOp Except "except"
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,E.InfixL $ setOp Union "union"]]
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setOp :: SetOperatorName -> Text -> Parser (QueryExpr -> QueryExpr -> QueryExpr)
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setOp ctor opName = cq
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<$> (ctor <$ keyword_ opName)
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<*> option SQDefault duplicates
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<*> corr
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cq o d c q0 q1 = QueryExprSetOp q0 o d c q1
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corr = option Respectively (Corresponding <$ keyword_ "corresponding")
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{-
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local data type to help with parsing the bit after the select list,
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called 'table expression' in the ansi sql grammar. Maybe this should
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@ -1568,20 +1582,6 @@ tableExpression = mkTe <$> from
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mkTe f w g h od (ofs,fe) =
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TableExpression f w g h od ofs fe
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setOp :: Parser (QueryExpr -> QueryExpr -> QueryExpr)
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setOp = cq
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<$> setOpK
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<*> option SQDefault duplicates
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<*> corr
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where
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cq o d c q0 q1 = QueryExprSetOp q0 o d c q1
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setOpK = choice [Union <$ keyword_ "union"
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,Intersect <$ keyword_ "intersect"
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,Except <$ keyword_ "except"]
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<?> "set operator"
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corr = option Respectively (Corresponding <$ keyword_ "corresponding")
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{-
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wrapper for query expr which ignores optional trailing semicolon.
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