+++ /dev/null
-Description of Surround:
-
-Surround consists of operators (uppercase/lowercase):
-
-AND/OR/NOT/nW/nN/() as infix and
-AND/OR/nW/nN as prefix.
-
-Distance operators W and N have default n=1, max 99.
-Implemented as SpanQuery with slop = (n - 1).
-An example prefix form is:
-
-20n(aa*, bb*, cc*)
-
-The name Surround was chosen because of this prefix form
-and because it uses the newly introduced span queries
-to implement the proximity operators.
-The names of the operators and the prefix and suffix
-forms have been borrowed from various other query
-languages described on the internet.
-
-
-Query terms from the Lucene standard query parser:
-
-field:termtext
-^ boost
-* internal and suffix truncation
-? one character
-
-
-Some examples:
-
-aa
-aa and bb
-aa and bb or cc same effect as: (aa and bb) or cc
-aa NOT bb NOT cc same effect as: (aa NOT bb) NOT cc
-
-and(aa,bb,cc) aa and bb and cc
-99w(aa,bb,cc) ordered span query with slop 98
-99n(aa,bb,cc) unordered span query with slop 98
-
-20n(aa*,bb*)
-3w(a?a or bb?, cc*)
-
-title: text: aa
-title : text : aa or bb
-title:text: aa not bb
-title:aa not text:bb
-
-cc 3w dd infix: dual.
-
-cc N dd N ee same effect as: (cc N dd) N ee
-
-text: aa 3d bb
-
-For examples on using the Surround language, see the
-test packages.
-
-
-Development status
-
-Not tested: multiple fields, internally mapped to OR queries,
-not compared to Lucene's MultipleFieldQuery.
-
-* suffix truncation is implemented very similar to Lucene's PrefixQuery.
-
-Wildcards (? and internal *) are implemented with regular expressions
-to allow further variations. A reimplementation using
-WildCardTermEnum (correct name?) should be no problem.
-
-Warnings about missing terms are sent to System.out, this might
-be replaced by another stream, and tested for in the tests.
-
-BooleanQueryTst.TestCollector uses a results checking method that should
-be replaced by the checking method from Lucene's TestBasics.java.
fnp / pylucene.git / blobdiff