mirror of
https://gitee.com/iresty/apisix.git
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105 lines
2.3 KiB
Lua
105 lines
2.3 KiB
Lua
--
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-- Licensed to the Apache Software Foundation (ASF) under one or more
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-- contributor license agreements. See the NOTICE file distributed with
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-- this work for additional information regarding copyright ownership.
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-- The ASF licenses this file to You under the Apache License, Version 2.0
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-- (the "License"); you may not use this file except in compliance with
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-- the License. You may obtain a copy of the License at
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--
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-- http://www.apache.org/licenses/LICENSE-2.0
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--
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-- Unless required by applicable law or agreed to in writing, software
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-- distributed under the License is distributed on an "AS IS" BASIS,
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-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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-- See the License for the specific language governing permissions and
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-- limitations under the License.
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--
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local type = type
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local concat = table.concat
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local tostring = tostring
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local ngx_null = ngx.null
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local gsub = string.gsub
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local sort = table.sort
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local pairs = pairs
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local ipairs = ipairs
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local _M = {}
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local meta_chars = {
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["\t"] = "\\t",
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["\\"] = "\\\\",
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['"'] = '\\"',
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["\r"] = "\\r",
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["\n"] = "\\n",
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}
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local function encode_str(s)
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return gsub(s, '["\\\r\n\t]', meta_chars)
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end
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local function is_arr(t)
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local exp = 1
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for k, _ in pairs(t) do
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if k ~= exp then
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return nil
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end
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exp = exp + 1
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end
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return exp - 1
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end
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local encode
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function encode (v)
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if v == nil or v == ngx_null then
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return "null"
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end
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local typ = type(v)
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if typ == 'string' then
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return '"' .. encode_str(v) .. '"'
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end
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if typ == 'number' or typ == 'boolean' then
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return tostring(v)
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end
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if typ == 'table' then
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local n = is_arr(v)
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if n then
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local bits = {}
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for i, elem in ipairs(v) do
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bits[i] = encode(elem)
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end
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return "[" .. concat(bits, ",") .. "]"
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end
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local keys = {}
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local i = 0
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for key, _ in pairs(v) do
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i = i + 1
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keys[i] = key
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end
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sort(keys)
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local bits = {}
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i = 0
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for _, key in ipairs(keys) do
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i = i + 1
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bits[i] = encode(key) .. ":" .. encode(v[key])
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end
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return "{" .. concat(bits, ",") .. "}"
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end
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return '"<' .. typ .. '>"'
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end
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_M.encode = encode
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return _M
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