[geodisambig] feature functions for GeoNames disambiguation

src/geonames_disambiguation.c

@@ -0,0 +1,102 @@
+#include "geonames_disambiguation.h"
+
+#define GEONAME_GENERIC_KEY_NAME "n"
+#define GEONAME_KEY_NAME_ADMIN1_ID "na1"
+#define GEONAME_KEY_NAME_ADMIN2_ID "na2"
+#define GEONAME_KEY_NAME_COUNTRY "nc"
+#define GEONAME_KEY_NAME_GEOHASH5 "nh5"
+#define GEONAME_KEY_NAME_GEOHASH6 "nh6"
+#define GEONAME_KEY_NAME_GEOHASH7 "nh7"
+
+bool geodisambig_add_name_feature(cstring_array *features, char *name) {
+    if (name == NULL || strlen(name) == 0) return false;
+    feature_array_add(features, 2, GEONAME_GENERIC_KEY_NAME, name);
+    return true;
+}
+
+
+bool geodisambig_add_country_feature(cstring_array *features, char *name, char *country) {
+    if (name == NULL || strlen(name) == 0 || country == NULL || strlen(country) == 0) return false;
+
+    feature_array_add(features, 3, GEONAME_KEY_NAME_COUNTRY, name, country);
+    
+    return true;
+}
+
+bool geodisambig_add_admin1_feature(cstring_array *features, char *name, uint32_t admin1_id) {
+    char numeric_string[INT32_MAX_STRING_SIZE];
+    printf("%d\n", admin1_id);
+
+    if (admin1_id != 0 && name != NULL) {
+        size_t n = sprintf(numeric_string, "%d", admin1_id);
+    } else {
+        return false;
+    }
+
+    feature_array_add(features, 3, GEONAME_KEY_NAME_ADMIN1_ID, name, numeric_string);
+    return true;
+
+}
+
+bool geodisambig_add_admin2_feature(cstring_array *features, char *name, uint32_t admin2_id) {
+    char numeric_string[INT32_MAX_STRING_SIZE];
+
+    if (admin2_id != 0 && name != NULL) {
+        size_t n = sprintf(numeric_string, "%d", admin2_id);
+    } else {
+        return false;
+    }
+
+    feature_array_add(features, 3, GEONAME_KEY_NAME_ADMIN2_ID, name, numeric_string);
+    return true;
+
+}
+
+static void geodisambig_add_geo_neighbors(cstring_array *features, char *geohash, size_t geohash_size, char *feature_name, char *name) {
+    size_t neighbors_size = geohash_size * 8;
+    char neighbors[neighbors_size];
+
+    int num_strings = 0;
+
+    if (geohash_neighbors(geohash, neighbors, neighbors_size, &num_strings) == GEOHASH_OK && num_strings == 8) {
+        for (int i = 0; i < num_strings; i++) {
+            char *neighbor = neighbors + geohash_size * i;
+            feature_array_add(features, 3, feature_name, name, neighbor);
+        }
+    }
+
+}
+
+bool geodisambig_add_geo_features(cstring_array *features, char *name, double latitude, double longitude) {
+    if (name == NULL || strlen(name) == 0) return false;
+
+    size_t geohash_size = 8;
+    char geohash[geohash_size];
+
+    if ((geohash_encode(latitude, longitude, geohash, geohash_size)) == GEOHASH_OK) {
+        feature_array_add(features, 3, GEONAME_KEY_NAME_GEOHASH7, name, geohash);
+
+        int num_strings = 0;
+
+        geodisambig_add_geo_neighbors(features, geohash, geohash_size, GEONAME_KEY_NAME_GEOHASH7, name);
+
+        geohash_size--;
+        geohash[geohash_size - 1] = '\0';
+        feature_array_add(features, 3, GEONAME_KEY_NAME_GEOHASH6, name, geohash);
+
+        geodisambig_add_geo_neighbors(features, geohash, geohash_size, GEONAME_KEY_NAME_GEOHASH6, name);
+
+        geohash_size--;
+        geohash[geohash_size - 1] = '\0';
+
+        feature_array_add(features, 3, GEONAME_KEY_NAME_GEOHASH5, name, geohash);
+
+        geodisambig_add_geo_neighbors(features, geohash, geohash_size, GEONAME_KEY_NAME_GEOHASH5, name);
+           
+    } else {
+        return false;
+    }
+
+    return true;
+
+}

src/geonames_disambiguation.h

@@ -0,0 +1,25 @@
+#ifndef GEONAMES_DISAMBIGUATION_H
+#define GEONAMES_DISAMBIGUATION_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+#include "geohash/geohash.h"
+#include "features.h"
+#include "string_utils.h"
+
+#define PLACE_NAME_FEATURES_DEFAULT_LENGTH 128
+#define GEO_FEATURES_DEFAULT_LENGTH 720
+#define POSTAL_CODE_FEATURES_DEFAULT_LENGTH 32
+
+// Both place names and postal codes
+bool geodisambig_add_name_feature(cstring_array *features, char *name);
+bool geodisambig_add_country_feature(cstring_array *features, char *name, char *country);
+
+// Only place names
+bool geodisambig_add_admin1_feature(cstring_array *features, char *name, uint32_t admin1_id);
+bool geodisambig_add_admin2_feature(cstring_array *features, char *name, uint32_t admin2_id);
+bool geodisambig_add_geo_features(cstring_array *features, char *name, double latitude, double longitude);
+
+#endif