encoder.py 文件源码

def _handle_attr(self, layer, feature, props):
        for k, v in props.items():
            if self._can_handle_attr(k, v):
                if not PY3 and isinstance(k, str):
                    k = k.decode('utf-8')

                if k not in self.seen_keys_idx:
                    layer.keys.append(k)
                    self.seen_keys_idx[k] = self.key_idx
                    self.key_idx += 1

                feature.tags.append(self.seen_keys_idx[k])

                if v not in self.seen_values_idx:
                    self.seen_values_idx[v] = self.val_idx
                    self.val_idx += 1

                    val = layer.values.add()
                    if isinstance(v, bool):
                        val.bool_value = v
                    elif isinstance(v, str):
                        if PY3:
                            val.string_value = v
                        else:
                            val.string_value = unicode(v, 'utf-8')
                    elif isinstance(v, unicode):
                        val.string_value = v
                    elif isinstance(v, (int, long)):
                        val.int_value = v
                    elif isinstance(v, float):
                        val.double_value = v

                feature.tags.append(self.seen_values_idx[v])