started with lookupCohorts

src/runtime/c/pgf/phrasetable.h

@@ -68,13 +68,27 @@ PgfPhrasetable phrasetable_delete(PgfPhrasetable table,
 PGF_INTERNAL_DECL
 size_t phrasetable_size(PgfPhrasetable table);
 
+typedef struct {
+	size_t pos;            // position in Unicode characters
+	const uint8_t *begin;  // pointer into the beginning of the range
+	const uint8_t *end;    // pointer into the end of the range
+} PgfTextRange;
+
 PGF_INTERNAL_DECL
 void phrasetable_lookup(PgfPhrasetable table,
-                        PgfText *sentence,
+                        PgfTextRange *sentence,
                         bool case_sensitive,
                         Namespace<struct PgfConcrLincat> lincats,
                         PgfMorphoCallback* callback, PgfExn* err);
 
+PGF_INTERNAL_DECL
+void phrasetable_lookup_prefixes(PgfPhrasetable table,
+                                 PgfTextRange *sentence,
+                                 bool case_sensitive,
+                                 Namespace<PgfConcrLincat> lincats,
+                                 ptrdiff_t min, ptrdiff_t max,
+                                 PgfCohortsCallback* callback, PgfExn* err);
+
 PGF_INTERNAL_DECL
 void phrasetable_iter(PgfConcr *concr,
                       PgfPhrasetable table,