157 lines
4.4 KiB
Plaintext
157 lines
4.4 KiB
Plaintext
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This BNF strictly shows the syntax of the query language. While some
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semantic checking is done at the parser level, most of the real semantic
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checking goes on in the query engine.
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Query : QExpr
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| QExpr COMMA_TOKEN Query
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QExpr : QTerm
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| QTerm OR_TOKEN QExpr
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QTerm : (NOT_TOKEN) QProp (W_OPEN_TOKEN Weight W_CLOSE_TOKEN)
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| (NOT_TOKEN) QProp (W_OPEN_TOKEN Weight W_CLOSE_TOKEN) AND_TOKEN QTerm
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QProp : QFactor
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| PROP_TOKEN property QFactor
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| PROP_REGEX_TOKEN property (EQUAL_TOKEN) REGEX
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| PROP_NATLANG_TOKEN property QPhrase
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QFactor : QGroup
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| OPEN_TOKEN Query CLOSE_TOKEN
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| OP_TOKEN phrase
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QGroup : QPhrase
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| QPhrase PROX_TOKEN QProp
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QPhrase : phrase(FUZZY_TOKEN | FUZ2_TOKEN)
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| REGEX
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| QUOTES_TOKEN extended_phrase(FUZZY_TOKEN | FUZ2_TOKEN)
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property : phrase
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| C_OPEN_TOKEN ((phrase COMMA_TOKEN)*phrase) C_CLOSE_TOKEN
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Weight : DIGITS
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# Note: the branch taken for parsing a "phrase" depends on the data-type
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# of the current property.
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phrase : STRING_PHRASE
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| INTEGER_PHRASE
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| FLOAT_PHRASE
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| BOOL_PHRASE
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| DATE_PHRASE
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| CURRENCY_PHRASE
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| GUID_PHRASE
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STRING_PHRASE : ANY
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INTEGER_PHRASE : (-)DIGITS
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FLOAT_PHRASE : (-)DIGITS(.DIGITS)
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BOOL_PHRASE : T
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| TRUE
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| FALSE
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| ANY # -- assumed to be FALSE
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# yyyy/mm/dd hh:mm:ss
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DATE_PHRASE : -[DIGITS PERIOD]+
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| DIGITS/DIGITS/DIGITS
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| DIGITS/DIGITS/DIGITS DIGITS:DIGITS:DIGITS
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| DIGITS/DIGITS/DIGITS DIGITS:DIGITS:DIGITS:MILLISECONDS
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PERIOD : h | n | s | y | m | d | w
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CURRENCY_PHRASE : DIGITS.DIGITS # dollars.cents
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GUID_PHRASE : %08lX-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X
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DIGITS : [0-9]+
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ANY : any sequence excluding {}!&|~*@#()[],=<>\n\"^$
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ANYEXCEPTQUOTE : any sequence excluding "
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# note: the real parsing of REGEX expressions is done in the query engine.
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# The parsing that the query parser does is just enough to hand off the
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# string to the query engine. The BNF for this is in the Query Language
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# Help page.
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REGEX : QUOTES_TOKEN ANYEXCEPTQUOTE QUOTES_TOKEN
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| any sequence before SPACE_TOKEN
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| any sequence before a ) not preceeded by a !
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# the XOF_TOKEN after OPERATOR here is only meaningful for vector properties
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OP_TOKEN : OPERATOR (XOF_TOKEN)
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OPERATOR : EQUAL_TOKEN
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| NOT_EQUAL_TOKEN
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| GREATER_TOKEN
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| GREATER_EQUAL_TOKEN
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| LESS_TOKEN
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| LESS_EQUAL_TOKEN
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| XOF_TOKEN
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XOF_TOKEN : ALLOF_TOKEN
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| SOMEOF_TOKEN
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C_OPEN_TOKEN : {
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C_CLOSE_TOKEN : }
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OPEN_TOKEN : (
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CLOSE_TOKEN : )
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AND_TOKEN : &
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| and
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OR_TOKEN : |
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| or
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NOT_TOKEN : !
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| not
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NOT_EQUAL_TOKEN : !=
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SPACE_TOKEN : ' '
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GREATER_TOKEN : >
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GREATER_EQUAL_TOKEN : >=
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LESS_TOKEN : <
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LESS_EQUAL_TOKEN : <=
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PROX_TOKEN : ~
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| near
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QUOTES_TOKEN : "
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PROP_TOKEN : @
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PROP_REGEX_TOKEN : #
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PROP_NATLANG_TOKEN : $
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EQUAL_TOKEN : =
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FUZZY_TOKEN : *
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FUZ2_TOKEY : **
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W_OPEN_TOKEN : [
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W_CLOSE_TOKEN : ]
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COMMA_TOKEN : ,
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ALLOF_TOKEN : ^a
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SOMEOF_TOKEN : ^s
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