73 lines
3.7 KiB
Plaintext
73 lines
3.7 KiB
Plaintext
/* Context-free grammar for Doctrine Query Language
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*
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* Document syntax:
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* - non-terminals begin with an upper case character
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* - terminals begin with a lower case character
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* - parentheses (...) are used for grouping
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* - square brackets [...] are used for defining an optional part, eg. zero or
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* one time time
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* - curly brackets {...} are used for repetion, eg. zero or more times
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* - double quotation marks "..." define a terminal string
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* - a vertical bar represents an alternative
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*/
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QueryLanguage = SelectStatement | UpdateStatement | DeleteStatement
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SelectStatement = [SelectClause] FromClause [WhereClause] [GroupByClause] [HavingClause] [OrderByClause] [LimitClause]
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UpdateStatement = UpdateClause [WhereClause] [OrderByClause] [LimitClause]
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DeleteStatement = DeleteClause [WhereClause] [OrderByClause] [LimitClause]
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Subselect = SimpleSelectClause FromClause [WhereClause] [GroupByClause] [HavingClause] [OrderByClause] [LimitClause] [OffsetClause]
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SelectClause = "SELECT" ["ALL" | "DISTINCT"] SelectExpression {"," SelectExpression}
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SimpleSelectClause = "SELECT" ["ALL" | "DISTINCT"] SelectExpression
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DeleteClause = "DELETE" "FROM" RangeVariableDeclaration
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WhereClause = "WHERE" ConditionalExpression
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FromClause = "FROM" IdentificationVariableDeclaration {"," IdentificationVariableDeclaration}
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HavingClause = "HAVING" ConditionalExpression
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GroupByClause = "GROUP" "BY" GroupByItem {"," GroupByItem}
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OrderByClause = "ORDER" "BY" OrderByItem {"," OrderByItem}
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LimitClause = "LIMIT" Expression ["OFFSET" Expression]
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UpdateClause = "UPDATE" RangeVariableDeclaration "SET" UpdateItem {"," UpdateItem}
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OrderByItem = Expression ["ASC" | "DESC"]
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GroupByItem = PathExpression
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UpdateItem = PathExpression "=" (Expression | "NULL")
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IdentificationVariableDeclaration = RangeVariableDeclaration {Join}
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RangeVariableDeclaration = PathExpression [["AS"] IdentificationVariable]
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Join = ["LEFT" | "INNER"] "JOIN" RangeVariableDeclaration [("ON" | "WITH") ConditionalExpression] [IndexBy]
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IndexBy = "INDEX" "BY" PathExpression
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ConditionalExpression = ConditionalTerm {"OR" ConditionalTerm}
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ConditionalTerm = ConditionalFactor {"AND" ConditionalFactor}
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ConditionalFactor = ["NOT"] ConditionalPrimary
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ConditionalPrimary = SimpleConditionalExpression | "(" ConditionalExpression ")"
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SimpleConditionalExpression
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= Expression (ComparisonExpression | BetweenExpression | LikeExpression
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| InExpression | NullComparisonExpression) | ExistsExpression
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Atom = string_literal | numeric_constant | input_parameter
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Expression = Term {("+" | "-") Term}
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Term = Factor {("*" | "/") Factor}
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Factor = [("+" | "-")] Primary
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Primary = PathExpression | Atom | "(" Expression ")" | Function | AggregateExpression
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SelectExpression = (PathExpressionEndingWithAsterisk | Expression | "(" Subselect ")" ) [["AS"] IdentificationVariable]
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PathExpression = identifier {"." identifier}
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PathExpressionEndingWithAsterisk = {identifier "."} "*"
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AggregateExpression = ("AVG" | "MAX" | "MIN" | "SUM") "(" ["DISTINCT"] Expression ")"
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| "COUNT" "(" ["DISTINCT"] (Expression | "*") ")"
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QuantifiedExpression = ("ALL" | "ANY" | "SOME") "(" Subselect ")"
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BetweenExpression = ["NOT"] "BETWEEN" Expression "AND" Expression
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ComparisonExpression = ComparisonOperator ( QuantifiedExpression | Expression | "(" Subselect ")" )
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InExpression = ["NOT"] "IN" "(" (Atom {"," Atom} | Subselect) ")"
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LikeExpression = ["NOT"] "LIKE" Expression ["ESCAPE" string_literal]
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NullComparisonExpression = "IS" ["NOT"] "NULL"
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ExistsExpression = ["NOT"] "EXISTS" "(" Subselect ")"
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Function = identifier "(" [Expression {"," Expression}] ")"
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