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Class Summary
Class
Description
LocalSearchService
Local Prospective Search service using in-memory O(n) subscription
management.
ProspectiveSearchReservedKinds
Exposes constants for reserved datastore kinds used by the local datastore
service.
QueryEvaluator
The QueryEvaluator class performs a full visit of the query tree,
dispatching leaf evaluations to the QueryEngine.
Package com.google.appengine.api.prospectivesearch.dev Description
Implementation Notes
Matching entity properties with string values is done with
substring matching, not against tokens.
Numeric limits in the public API that are specified as long are
truncated to int. E.g. in the listTopics method.
Python language diffs
Empty queries invalid; python accepts.
Curly braces as grouping operator are not supported; python
accepts.
Unbalanced quotes considered invalid; python accepts. Quotes
treated as term breaks. python considers part of word when inline
with other characters.
Number ranges require whitespace around elipsis; python does not.
BNF for VanillaQuery.jj
TOKENS
<DEFAULT> SKIP : {
" "
| "\t"
| "\n"
| "\r"
| "\r\n"
}
<DEFAULT> TOKEN : {
<DOT: ".">
| <COLON: ":">
| <EQUALS: "=">
| <EQUALSEQUALS: "==">
| <LPAREN: "(">
| <RPAREN: ")">
| <AND: "AND">
| <OR: "OR" | "|">
| <NOT: "-" | "NOT">
| <LESS: "<">
| <GREATER: ">">
| <LESSOREQUALS: "<=" | "=<">
| <GREATEROREQUALS: ">=" | "=>">
| <#DIGIT: ["0"-"9"]>
| <#DIGITS: (<DIGIT>)+>
| <NUMBER: ("-" | "+")? (<DIGITS> (<DOT> <DIGITS>)? | <DOT> <DIGITS>)>
| <ELIPSIS: ".." | "...">
| <NUMBERRANGE: <NUMBER> <ELIPSIS> <NUMBER>>
| <#NOTSPECIAL: ~[":","=","(",")","{","}","|","-","<",">"," ","\""]>
| <TEXT: <NOTSPECIAL> (<NOTSPECIAL> | "-")*>
| <STRING_LITERAL: "\"" (~["\""])* "\"">
}
NON-TERMINALS
/**
* Root production for syntax like (x AND y OR b AND (a b)), terminals
* handled by QueryTerm().
*/
QueryExpr ::=
QueryTerm ( <AND> QueryTerm | <OR> QueryTerm | QueryTerm )* <EOF>
/**
* Production for query terms, e.g.:
*
* -a
* a:b
* (a:b -c)
*/
QueryTerm ::=
<NOT> QueryTerm
|
<TEXT> ( Op QueryValue )?
|
<LPAREN> QueryExpr <RPAREN>
/**
* Production for query operator, e.g. the ":" in:
*
* a:b
* where ":" may also be: =, ==, <, <=, >, >=.
*/
Op ::=
( <COLON> | <EQUALS> | <EQUALSEQUALS> | <LESS> | <GREATER> | <LESSOREQUALS> | <GREATEROREQUALS> )
/**
* Production to recognize the query text, which may also be a number
* range or a nested boolean query just on that field, e.g.:
*
* a:b AND a:c
*
* may be:
*
* a:(b AND c)
*/
QueryValue ::=
<TEXT>
|
<STRING_LITERAL>
|
( <NUMBER> ( <ELIPSIS> <NUMBER> )? )
|
<LPAREN> FieldQueryExpr <RPAREN>
/**
* Production to recognize the inner field query text, otherwise
* similar to QueryExpr.
*/
FieldQueryExpr ::=
FieldTerm ( <AND> FieldTerm | <OR> FieldTerm | FieldTerm )*
/**
* Production to recognize the inner field terms, otherwise
* similar to QueryTerm.
*/
FieldTerm ::=
<NOT> FieldTerm
|
<TEXT>
|
<STRING_LITERAL>
|
<LPAREN> FieldQueryExpr <RPAREN>
