xapian: Wrap RangeProcessor.

* xapian.i.in (GuileXapianRangeProcessorWrapper): New class.
* xapian/xapian.scm (prefixed-range-processor,
suffixed-range-processor): New public functions.

1 files changed, 37 insertions, 0 deletions

diff --git a/xapian/xapian.scm b/xapian/xapian.scm
index 9ca5df6..15690aa 100644
--- a/xapian/xapian.scm
+++ b/xapian/xapian.scm
@@ -54,6 +54,8 @@
             query-and
             query-or
             query-filter
+            prefixed-range-processor
+            suffixed-range-processor
             field-processor
             enquire
             enquire-mset
@@ -240,6 +242,41 @@ In a non-weighted context, @code{query-filter} and @code{query-and}
 are equivalent."
   (apply query-combine (Query-OP-FILTER) (Query-MatchAll) queries))
 
+(define* (prefixed-range-processor slot proc #:key (prefix "") repeated?)
+  "Return a @code{RangeProcessor} object that calls @var{proc} to process
+its range over @var{slot}.
+
+@var{proc} is a procedure that, given a begin string and an end
+string, must return a @code{Query} object. For open-ended ranges,
+either the begin string or the end string will be @code{#f}.
+
+@var{prefix} is a prefix to look for to recognize values as belonging
+to this range. When @var{repeated?} is @code{#t}, allow @var{prefix}
+on both ends of the range—@samp{$1..$10}."
+  (new-GuileXapianRangeProcessorWrapper
+   slot
+   prefix
+   (get-flag RP-REPEATED repeated?)
+   proc))
+
+(define* (suffixed-range-processor slot proc #:key suffix repeated?)
+  "Return a @code{RangeProcessor} object that calls @var{proc} to process
+its range over @var{slot}.
+
+@var{proc} is a procedure that, given a begin string and an end
+string, must return a @code{Query} object. For open-ended ranges,
+either the begin string or the end string will be @code{#f}.
+
+@var{suffix} is a suffix to look for to recognize values as belonging
+to this range. When @var{repeated?} is @code{#t}, allow @var{suffix}
+on both ends of the range—@samp{2kg..12kg}."
+  (new-GuileXapianRangeProcessorWrapper
+   slot
+   suffix
+   (bitwise-ior (RP-SUFFIX)
+                (get-flag RP-REPEATED repeated?))
+   proc))
+
 (define (field-processor proc)
   "Return a @code{FieldProcessor} object that calls
 @var{proc} to process its field. @var{proc} is a procedure that, given