xapian: Wrap DateRangeProcessor.

* xapian/xapian.scm (prefixed-date-range-processor,
suffixed-date-range-processor): New public functions.

1 files changed, 36 insertions, 0 deletions

diff --git a/xapian/xapian.scm b/xapian/xapian.scm
index 15690aa..f395162 100644
--- a/xapian/xapian.scm
+++ b/xapian/xapian.scm
@@ -56,6 +56,8 @@
             query-filter
             prefixed-range-processor
             suffixed-range-processor
+            prefixed-date-range-processor
+            suffixed-date-range-processor
             field-processor
             enquire
             enquire-mset
@@ -277,6 +279,40 @@ on both ends of the range—@samp{2kg..12kg}."
                 (get-flag RP-REPEATED repeated?))
    proc))
 
+(define* (prefixed-date-range-processor slot #:key (prefix "") repeated? prefer-mdy? (epoch-year 1970))
+  "Return a @code{DateRangeProcessor} object that handles date ranges on
+@var{slot}.
+
+@var{prefix} and @var{repeated?} are the same as in
+@code{prefixed-range-processor}.
+
+When @var{prefer-mdy?} is @code{#t}, interpret ambiguous dates as
+month/day/year rather than day/month/year.
+
+@var{epoch-year} is the year to use as the epoch for dates with
+two-digit years."
+  (new-DateRangeProcessor slot
+                          prefix
+                          (bitwise-ior (get-flag (RP-REPEATED) repeated?)
+                                       (get-flag (RP-DATE-PREFER-MDY) prefer-mdy?))
+                          epoch-year))
+
+(define* (suffixed-date-range-processor slot #:key suffix repeated? prefer-mdy? (epoch-year 1970))
+  "Return a @code{DateRangeProcessor} object that handles date ranges on
+@var{slot}.
+
+@var{suffix} and @var{repeated?} are the same as in
+@code{suffixed-range-processor}.
+
+@var{prefer-mdy?} and @var{epoch-year} are the same as in
+@code{prefixed-date-range-processor}."
+  (new-DateRangeProcessor slot
+                          suffix
+                          (bitwise-ior (RP-SUFFIX)
+                                       (get-flag (RP-REPEATED) repeated?)
+                                       (get-flag (RP-DATE-PREFER-MDY) prefer-mdy?))
+                          epoch-year))
+
 (define (field-processor proc)
   "Return a @code{FieldProcessor} object that calls
 @var{proc} to process its field. @var{proc} is a procedure that, given