Hi, Oleksii: Can you explain what you are trying to accomplish?
There may be better ways of doing the same thing than creating a custom grammar, which is really a tool of last resort. For instance, a custom constraint can map a term to a custom query. For other cases, it's often useful to do postprocessing on the generated query. If a custom grammar really is unavoidable, in many cases a special-purpose third-party parsing tool may provide a faster and more flexible alternative to the limited custom grammar in the Search API. For instance, the Jison.js and Peg.js parsers work with server-side JavaScript. (A nearly.js parser is also available, though I've heard no reports about it yet.) Hoping that helps, Erik Hennum ________________________________ From: [email protected] [[email protected]] on behalf of Oleksii Segeda [[email protected]] Sent: Monday, January 30, 2017 8:51 AM To: [email protected] Subject: [MarkLogic Dev General] Custom search grammar Hi there, I’m trying to declare a custom search grammar. I declared a custom function via search options, which supposed to parse “BOOST” keyword: <joiner strength="2" apply="custom-boost" ns="http://worldbankgroup.org/search/grammar"; at="/lib/grammar-boost.xqy" tokenize="word">BOOST</joiner> I declared this function and just copied existing implementation from impl:joiner-boost function in /MarkLogic/appservices/search/search-impl.xqy : declare function grammar:custom-boost($ps as map:map, $left as element()?, $opts as element()?) as schema-element(cts:query) { let $symbol := impl:symbol-lookup($ps) let $_ := tdop:advance($ps) let $expr1 := tdop:expression($ps, $symbol/@strength) return if (empty($left)) then ($left, impl:msg($ps, <cts:annotation warning="SEARCH-IGNOREDQTEXT:[{string($symbol)} {$expr1}]: expected two arguments"/>)) else element { xs:QName($symbol/@element) } { attribute qtextjoin {concat($symbol/string())}, attribute strength {$symbol/@strength}, attribute qtextgroup { impl:opts($ps)/opt:grammar/opt:starter[@apply eq "grouping"]/(string(), @delimiter/string()) }, for $opt in $symbol/@options/tokenize(normalize-space(.)<mailto:$symbol/@options/tokenize(normalize-space(.)>, "\s") return <cts:option>{$opt}</cts:option>, element cts:matching-query { attribute qtextref { "schema-element(cts:query)" }, $left }, element cts:boosting-query { attribute qtextref { "schema-element(cts:query)" }, $expr1 } } }; Unfortunately this doesn’t work, because for some reason impl:symbol-lookup returns an empty sequence. Any ideas what went wrong here? Oleksii Segeda IT Analyst Information and Technology Solutions [http://siteresources.worldbank.org/NEWS/Images/spacer.png] [http://siteresources.worldbank.org/NEWS/Images/WBG_Information_and_Technology_Solutions.png]
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