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--!A cross-platform build utility based on Lua
--
-- Licensed 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.
--
-- Copyright (C) 2015-present, TBOOX Open Source Group.
--
-- @author ruki
-- @file json.lua
--
-- define module: json
local json = json or {}
local cjson = cjson or {}
-- laod modules
local io = require("base/io")
local utils = require("base/utils")
-- export null
json.null = cjson.null
-- decode json string to the lua table
--
-- @param jsonstr the json string
-- @param opt the options
-- - max_depth
-- - invalid_numbers
--
-- @return the lua table
--
function json.decode(jsonstr, opt)
local cjsonobj = cjson
if opt then
if opt.max_depth then
if cjsonobj == cjson then
cjsonobj = cjson.new()
end
cjsonobj.decode_max_depth(opt.max_depth)
end
if opt.invalid_numbers then
if cjsonobj == cjson then
cjsonobj = cjson.new()
end
cjsonobj.decode_invalid_numbers(opt.invalid_numbers)
end
end
local ok, luatable_or_errors = utils.trycall(cjsonobj.decode, nil, jsonstr)
if not ok then
return nil, string.format("decode json failed, %s", luatable_or_errors)
end
return luatable_or_errors
end
-- encode lua table to the json string
--
-- @param luatable the lua table
-- @param opt the options
-- - max_depth
-- - invalid_numbers
-- - keep_buffer
-- - number_precision
--
-- @return the json string
--
function json.encode(luatable, opt)
local cjsonobj = cjson
if opt then
if opt.max_depth then
if cjsonobj == cjson then
cjsonobj = cjson.new()
end
cjsonobj.encode_max_depth(opt.max_depth)
end
if opt.invalid_numbers then
if cjsonobj == cjson then
cjsonobj = cjson.new()
end
cjsonobj.encode_invalid_numbers(opt.invalid_numbers)
end
if opt.keep_buffer then
if cjsonobj == cjson then
cjsonobj = cjson.new()
end
cjsonobj.encode_keep_buffer(opt.keep_buffer)
end
if opt.number_precision then
if cjsonobj == cjson then
cjsonobj = cjson.new()
end
cjsonobj.encode_number_precision(opt.number_precision)
end
end
local ok, jsonstr_or_errors = utils.trycall(cjsonobj.encode, nil, luatable)
if not ok then
return nil, string.format("encode json failed, %s", jsonstr_or_errors)
end
return jsonstr_or_errors
end
-- load json file to the lua table
--
-- @param filepath the json file path
-- @param opt the options
-- - encoding for io/file, e.g. utf8, utf16, utf16le, utf16be ..
-- - continuation for io/read (concat string with the given continuation characters)
-- - max_depth
-- - invalid_numbers
--
-- @return the lua table
--
function json.loadfile(filepath, opt)
local filedata, errors = io.readfile(filepath, opt)
if not filedata then
return nil, errors
end
return json.decode(filedata, opt)
end
-- save lua table to the json file
--
-- @param filepath the json file path
-- @param luatable the lua table
-- @param opt the options
-- - encoding for io/file, e.g. utf8, utf16, utf16le, utf16be ..
-- - max_depth
-- - invalid_numbers
-- - keep_buffer
-- - number_precision
--
-- @return the json string
--
function json.savefile(filepath, luatable, opt)
local jsonstr, errors = json.encode(luatable, opt)
if not jsonstr then
return false, errors
end
return io.writefile(filepath, jsonstr, opt)
end
-- return module: json
return json
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