Stringify feature properties that are arrays or hashes

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 1.7.2
+
+* Feature properties that are arrays or hashes get stringified
+  rather than being left out with a warning.
+
 ## 1.7.1
 
 * Make clipping behavior with no buffer consistent with Mapnik.

geojson.c

@@ -517,6 +517,7 @@ int serialize_geometry(json_object *geometry, json_object *properties, const cha
 	char *metakey[nprop];
 	char *metaval[nprop];
 	int metatype[nprop];
+	int mustfree[nprop];
 	int m = 0;
 
 	int i;
@@ -531,6 +532,7 @@ int serialize_geometry(json_object *geometry, json_object *properties, const cha
 			}
 
 			metakey[m] = properties->keys[i]->string;
+			mustfree[m] = 0;
 
 			if (properties->values[i] != NULL && properties->values[i]->type == JSON_STRING) {
 				metatype[m] = VT_STRING;
@@ -547,8 +549,10 @@ int serialize_geometry(json_object *geometry, json_object *properties, const cha
 			} else if (properties->values[i] != NULL && (properties->values[i]->type == JSON_NULL)) {
 				;
 			} else {
-				fprintf(stderr, "%s:%d: Unsupported property type for %s\n", reading, line, properties->keys[i]->string);
-				continue;
+				metatype[m] = VT_STRING;
+				metaval[m] = json_stringify(properties->values[i]);
+				mustfree[m] = 1;
+				m++;
 			}
 		}
 	}
@@ -557,6 +561,10 @@ int serialize_geometry(json_object *geometry, json_object *properties, const cha
 	for (i = 0; i < m; i++) {
 		serialize_long_long(metafile, addpool(poolfile, treefile, metakey[i], VT_STRING), metapos, fname);
 		serialize_long_long(metafile, addpool(poolfile, treefile, metaval[i], metatype[i]), metapos, fname);
+
+		if (mustfree[i]) {
+			free(metaval[i]);
+		}
 	}
 
 	long long geomstart = *geompos;

jsonpull.c

@@ -194,6 +194,21 @@ static void string_append(struct string *s, char c) {
 	s->buf[s->n] = '\0';
 }
 
+static void string_append_string(struct string *s, char *add) {
+	int len = strlen(add);
+
+	if (s->n + len + 1 >= s->nalloc) {
+		s->nalloc += 500 + len;
+		s->buf = realloc(s->buf, s->nalloc);
+	}
+
+	for (; *add != '\0'; add++) {
+		s->buf[s->n++] = *add;
+	}
+
+	s->buf[s->n] = '\0';
+}
+
 static void string_free(struct string *s) {
 	free(s->buf);
 }
@@ -621,3 +636,85 @@ void json_disconnect(json_object *o) {
 
 	o->parent = NULL;
 }
+
+static void json_print_one(struct string *val, json_object *o) {
+	if (o == NULL) {
+		string_append_string(val, "NULL");
+	} else if (o->type == JSON_STRING) {
+		string_append(val, '\"');
+
+		char *cp;
+		for (cp = o->string; *cp != '\0'; cp++) {
+			if (*cp == '\\' || *cp == '"') {
+				string_append(val, '\\');
+				string_append(val, *cp);
+			} else if (*cp >= 0 && *cp < ' ') {
+				char *s;
+				if (asprintf(&s, "\\u%04x", *cp) >= 0) {
+					string_append_string(val, s);
+					free(s);
+				}
+			} else {
+				string_append(val, *cp);
+			}
+		}
+
+		string_append(val, '\"');
+	} else if (o->type == JSON_NUMBER) {
+		char *s;
+		if (asprintf(&s, "%f", o->number) >= 0) {
+			string_append_string(val, s);
+			free(s);
+		}
+	} else if (o->type == JSON_NULL) {
+		string_append_string(val, "null");
+	} else if (o->type == JSON_TRUE) {
+		string_append_string(val, "true");
+	} else if (o->type == JSON_FALSE) {
+		string_append_string(val, "false");
+	} else if (o->type == JSON_HASH) {
+		string_append(val, '}');
+	} else if (o->type == JSON_ARRAY) {
+		string_append(val, ']');
+	}
+}
+
+static void json_print(struct string *val, json_object *o) {
+	if (o == NULL) {
+		// Hash value in incompletely read hash
+		string_append_string(val, "NULL");
+	} else if (o->type == JSON_HASH) {
+		string_append(val, '{');
+
+		int i;
+		for (i = 0; i < o->length; i++) {
+			json_print(val, o->keys[i]);
+			string_append(val, ':');
+			json_print(val, o->values[i]);
+			if (i + 1 < o->length) {
+				string_append(val, ',');
+			}
+		}
+		string_append(val, '}');
+	} else if (o->type == JSON_ARRAY) {
+		string_append(val, '[');
+		int i;
+		for (i = 0; i < o->length; i++) {
+			json_print(val, o->array[i]);
+			if (i + 1 < o->length) {
+				string_append(val, ',');
+			}
+		}
+		string_append(val, ']');
+	} else {
+		json_print_one(val, o);
+	}
+}
+
+char *json_stringify(json_object *o) {
+	struct string val;
+	string_init(&val);
+	json_print(&val, o);
+
+	return val.buf;
+}

jsonpull.h

@@ -62,3 +62,5 @@ void json_free(json_object *j);
 void json_disconnect(json_object *j);
 
 json_object *json_hash_get(json_object *o, const char *s);
+
+char *json_stringify(json_object *o);

version.h

@@ -1 +1 @@
-#define VERSION "tippecanoe v1.7.1\n"
+#define VERSION "tippecanoe v1.7.2\n"