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August 26, 2015 14:19
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SQL Select Grammar
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/** | |
* Grammar for validating simple SQL selects. | |
* @author Marcelo Camargo | |
* @since 2015/08/26 | |
*/ | |
{ | |
var Sql = { | |
listToString: function(x, xs) { | |
return [x].concat(xs).join(""); | |
} | |
}; | |
} | |
Start | |
= Stmt | |
Stmt | |
= SelectStmt | |
/* Statements */ | |
SelectStmt | |
= _ SelectToken | |
_ x:SelectField xs:SelectFieldRest* | |
_ FromToken | |
_ from:Identifier | |
_ where:WhereExpr? { | |
return { | |
type: "SELECT", | |
fields: [x].concat(xs), | |
from: from, | |
where: where | |
}; | |
} | |
SelectField "select valid field" | |
= Identifier | |
/ "*" | |
SelectFieldRest | |
= _ SeparatorToken _ s:SelectField { | |
return s; | |
} | |
WhereExpr "where expression" | |
= WhereToken x:LogicExpr xs:LogicExprRest* { | |
return { | |
conditions: [x].concat(xs) | |
}; | |
} | |
LogicExpr | |
= _ "(" _ x:LogicExpr xs:LogicExprRest* _ ")" _ { | |
return [x].concat(xs); | |
} | |
/ _ left:Expr _ op:Operator _ right:Expr _ { | |
return { | |
left: left, | |
op: op, | |
right: right | |
}; | |
} | |
LogicExprRest | |
= _ j:Joiner _ l:LogicExpr { | |
return { | |
joiner: j, | |
expression: l | |
}; | |
} | |
Joiner "joiner" | |
= OrToken { return "Or"; } | |
/ AndToken { return "And"; } | |
Operator | |
= "<>" { return "Different"; } | |
/ "=" { return "Equal"; } | |
/ LikeToken { return "Like"; } | |
/* Expressions */ | |
Expr | |
= Float | |
/ Integer | |
/ Identifier | |
/ String | |
Integer "integer" | |
= n:[0-9]+ { | |
return parseInt(n.join("")); | |
} | |
Float "float" | |
= left:Integer "." right:Integer { | |
return parseFloat([ | |
left.toString(), | |
right.toString() | |
].join(".")); | |
} | |
String "string" | |
= "'" str:ValidStringChar* "'" { | |
return str.join(""); | |
} | |
ValidStringChar | |
= !"'" c:. { | |
return c; | |
} | |
/* Tokens */ | |
SelectToken | |
= "SELECT"i !IdentRest | |
SeparatorToken | |
= "," | |
FromToken | |
= "FROM"i !IdentRest | |
WhereToken | |
= "WHERE"i !IdentRest | |
LikeToken | |
= "LIKE"i !IdentRest | |
OrToken | |
= "OR"i !IdentRest | |
AndToken | |
= "AND"i !IdentRest | |
/* Identifier */ | |
Identifier "identifier" | |
= x:IdentStart xs:IdentRest* { | |
return Sql.listToString(x, xs); | |
} | |
IdentStart | |
= [a-z_]i | |
IdentRest | |
= [a-z0-9_]i | |
/* Skip */ | |
_ | |
= ( WhiteSpace / NewLine )* | |
NewLine "newline" | |
= "\r\n" | |
/ "\r" | |
/ "\n" | |
/ "\u2028" | |
/ "\u2029" | |
WhiteSpace "whitespace" | |
= " " | |
/ "\t" | |
/ "\v" | |
/ "\f" |
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