/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

parcel Lucy;

/** Encode/decode JSON.
 *
 * Provides utility functions for encoding/decoding JSON.
 */
class Lucy::Util::Json inherits Clownfish::Obj {

    /** Encode `dump` as JSON.  Returns NULL and sets the global error object
     * returned by [](cfish:cfish.Err.get_error) on failure.
     */
    inert incremented nullable String*
    to_json(Obj *dump);

    /** Decode the supplied JSON and return a data structure made
     * of Hashes, Vectors, and Strings.  Returns NULL and sets the global
     * error object returned by [](cfish:cfish.Err.get_error) on failure.
     */
    inert incremented nullable Obj*
    from_json(String *json);

    /** Encode `dump` as JSON and attempt to write to the indicated
     * file.
     * @return true if the write succeeds, false on failure (sets the global
     * error object returned by [](cfish:cfish.Err.get_error)).
     */
    inert bool
    spew_json(Obj *dump, Folder *folder, String *path);

    /** Decode the JSON in the file at `path` and return a data
     * structure made of Hashes, Vectors, and Strings.  Returns NULL and sets
     * the global error object returned by [](cfish:cfish.Err.get_error) if
     * the file can't be can't be opened or if the file doesn't contain valid
     * JSON.
     */
    inert incremented nullable Obj*
    slurp_json(Folder *folder, String *path);

    /** Allow the encoder to output strings, etc, instead of throwing an error
     * on anything other than a hash or an array.  Testing only.
     */
    inert void
    set_tolerant(bool tolerant);

    /** Extract an integer value from an object that is part of a JSON
     * structure. Throws an error if the object isn't a String or Num.
     */
    inert int64_t
    obj_to_i64(Obj *obj);

    /** Extract a float value from an object that is part of a JSON
     * structure. Throws an error if the object isn't a String or Num.
     */
    inert double
    obj_to_f64(Obj *obj);

    /** Extract a bool value from an object that is part of a JSON
     * structure. Throws an error if the object isn't a String or Num.
     */
    inert bool
    obj_to_bool(Obj *obj);
}


__C__

struct lucy_JsonParserState 
{
    cfish_Obj *result;
    bool       errors;
};
typedef struct lucy_JsonParserState lucy_JsonParserState;

__END_C__