[features] Adding counter/bag-of-words representation of features

src/features.c

@@ -22,4 +22,21 @@ void feature_array_add(cstring_array *features, size_t count, ...) {
     char_array_terminate(features->str);
 
     va_end(args);
-}
+}
+
+
+bool feature_counts_update(khash_t(str_uint32) *features, char *feature, int count) {
+    khiter_t k;
+
+    k = kh_get(str_uint32, features, feature);
+    if (k == kh_end(features)) {
+        int ret;
+        k = kh_put(str_uint32, features, feature, &ret);
+        if (ret < 0) return false;
+
+        kh_value(features, k) = count;
+    } else {
+        kh_value(features, k) += count;
+    }
+    return true;
+}

src/features.h

@@ -1,18 +1,19 @@
 #ifndef FEATURES_H
 #define FEATURES_H
 
-
- 
-
 #include <stdlib.h>
 #include <stdarg.h>
+#include "collections.h"
 #include "string_utils.h"
 
 #define FEATURE_SEPARATOR_CHAR "|"
 
+// Add feature to array
+
 void feature_array_add(cstring_array *features, size_t count, ...);
 
+// Add feature count to dictionary
 
- 
+bool feature_counts_update(khash_t(str_uint32) *features, char *feature, int count); 
 
 #endif