479 lines
13 KiB
Lua
479 lines
13 KiB
Lua
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local type = type
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local next = next
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local error = error
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local tonumber = tonumber
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local tostring = tostring
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local utf8_char = utf8.char
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local table_concat = table.concat
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local table_sort = table.sort
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local string_char = string.char
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local string_byte = string.byte
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local string_find = string.find
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local string_match = string.match
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local string_gsub = string.gsub
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local string_sub = string.sub
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local string_format = string.format
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local math_type = math.type
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local setmetatable = setmetatable
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local getmetatable = getmetatable
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local huge = math.huge
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local tiny = -huge
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local json = {}
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json.object = {}
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json.supportSparseArray = true
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-- json.encode --
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local statusVisited
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local statusBuilder
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local encode_map = {}
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local encode_escape_map = {
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[ "\"" ] = "\\\"",
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[ "\\" ] = "\\\\",
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[ "/" ] = "\\/",
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[ "\b" ] = "\\b",
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[ "\f" ] = "\\f",
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[ "\n" ] = "\\n",
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[ "\r" ] = "\\r",
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[ "\t" ] = "\\t",
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}
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local decode_escape_set = {}
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local decode_escape_map = {}
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for k, v in next, encode_escape_map do
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decode_escape_map[v] = k
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decode_escape_set[string_byte(v, 2)] = true
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end
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for i = 0, 31 do
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local c = string_char(i)
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if not encode_escape_map[c] then
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encode_escape_map[c] = string_format("\\u%04x", i)
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end
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end
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local function encode(v)
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local res = encode_map[type(v)](v)
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statusBuilder[#statusBuilder+1] = res
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end
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encode_map["nil"] = function ()
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return "null"
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end
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local function encode_string(v)
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return string_gsub(v, '[\0-\31\\"]', encode_escape_map)
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end
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function encode_map.string(v)
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statusBuilder[#statusBuilder+1] = '"'
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statusBuilder[#statusBuilder+1] = encode_string(v)
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return '"'
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end
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local function convertreal(v)
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local g = string_format('%.16g', v)
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if tonumber(g) == v then
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return g
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end
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return string_format('%.17g', v)
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end
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if string_match(tostring(1/2), "%p") == "," then
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local _convertreal = convertreal
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function convertreal(v)
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return string_gsub(_convertreal(v), ',', '.')
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end
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end
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function encode_map.number(v)
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if v ~= v or v <= tiny or v >= huge then
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error("unexpected number value '" .. tostring(v) .. "'")
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end
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return convertreal(v)
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end
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function encode_map.boolean(v)
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if v then
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return "true"
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else
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return "false"
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end
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end
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function encode_map.table(t)
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local first_val = next(t)
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if first_val == nil then
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if getmetatable(t) == json.object then
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return "{}"
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else
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return "[]"
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end
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end
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if statusVisited[t] then
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error("circular reference")
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end
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statusVisited[t] = true
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if type(first_val) == 'string' then
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local keys = {}
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for k in next, t do
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if type(k) ~= "string" then
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error("invalid table: mixed or invalid key types")
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end
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keys[#keys+1] = k
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end
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table_sort(keys)
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local k = keys[1]
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statusBuilder[#statusBuilder+1] = '{"'
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statusBuilder[#statusBuilder+1] = encode_string(k)
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statusBuilder[#statusBuilder+1] = '":'
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encode(t[k])
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for i = 2, #keys do
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local k = keys[i]
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statusBuilder[#statusBuilder+1] = ',"'
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statusBuilder[#statusBuilder+1] = encode_string(k)
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statusBuilder[#statusBuilder+1] = '":'
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encode(t[k])
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end
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statusVisited[t] = nil
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return "}"
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else
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local count = 0
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local max = 0
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for k in next, t do
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if math_type(k) ~= "integer" or k <= 0 then
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error("invalid table: mixed or invalid key types")
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end
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count = count + 1
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if max < k then
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max = k
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end
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end
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if not json.supportSparseArray and count ~= max then
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error("sparse array are not supported")
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end
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statusBuilder[#statusBuilder+1] = "["
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encode(t[1])
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for i = 2, max do
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statusBuilder[#statusBuilder+1] = ","
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encode(t[i])
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end
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statusVisited[t] = nil
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return "]"
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end
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end
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local function encode_unexpected(v)
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if v == json.null then
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return "null"
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else
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error("unexpected type '"..type(v).."'")
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end
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end
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encode_map[ "function" ] = encode_unexpected
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encode_map[ "userdata" ] = encode_unexpected
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encode_map[ "thread" ] = encode_unexpected
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function json.encode(v)
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statusVisited = {}
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statusBuilder = {}
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encode(v)
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return table_concat(statusBuilder)
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end
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json._encode_map = encode_map
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json._encode_string = encode_string
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-- json.decode --
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local statusBuf
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local statusPos
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local statusTop
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local statusAry = {}
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local statusRef = {}
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local function find_line()
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local line = 1
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local pos = 1
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while true do
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local f, _, nl1, nl2 = string_find(statusBuf, '([\n\r])([\n\r]?)', pos)
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if not f then
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return line, statusPos - pos + 1
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end
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local newpos = f + ((nl1 == nl2 or nl2 == '') and 1 or 2)
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if newpos > statusPos then
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return line, statusPos - pos + 1
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end
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pos = newpos
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line = line + 1
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end
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end
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local function decode_error(msg)
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error(string_format("ERROR: %s at line %d col %d", msg, find_line()))
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end
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local function get_word()
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return string_match(statusBuf, "^[^ \t\r\n%]},]*", statusPos)
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end
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local function next_byte()
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local pos = string_find(statusBuf, "[^ \t\r\n]", statusPos)
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if pos then
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statusPos = pos
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return string_byte(statusBuf, pos)
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end
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return -1
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end
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local function consume_byte(c)
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local _, pos = string_find(statusBuf, c, statusPos)
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if pos then
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statusPos = pos + 1
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return true
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end
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end
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local function expect_byte(c)
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local _, pos = string_find(statusBuf, c, statusPos)
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if not pos then
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decode_error(string_format("expected '%s'", string_sub(c, #c)))
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end
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statusPos = pos
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end
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local function decode_unicode_surrogate(s1, s2)
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return utf8_char(0x10000 + (tonumber(s1, 16) - 0xd800) * 0x400 + (tonumber(s2, 16) - 0xdc00))
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end
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local function decode_unicode_escape(s)
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return utf8_char(tonumber(s, 16))
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end
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local function decode_string()
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local has_unicode_escape = false
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local has_escape = false
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local i = statusPos + 1
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while true do
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i = string_find(statusBuf, '["\\\0-\31]', i)
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if not i then
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decode_error "expected closing quote for string"
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end
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local x = string_byte(statusBuf, i)
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if x < 32 then
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statusPos = i
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decode_error "control character in string"
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end
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if x == 34 --[[ '"' ]] then
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local s = string_sub(statusBuf, statusPos + 1, i - 1)
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if has_unicode_escape then
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s = string_gsub(string_gsub(s
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, "\\u([dD][89aAbB]%x%x)\\u([dD][c-fC-F]%x%x)", decode_unicode_surrogate)
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, "\\u(%x%x%x%x)", decode_unicode_escape)
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end
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if has_escape then
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s = string_gsub(s, "\\.", decode_escape_map)
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end
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statusPos = i + 1
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return s
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end
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--assert(x == 92 --[[ "\\" ]])
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local nx = string_byte(statusBuf, i+1)
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if nx == 117 --[[ "u" ]] then
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if not string_match(statusBuf, "^%x%x%x%x", i+2) then
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statusPos = i
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decode_error "invalid unicode escape in string"
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end
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has_unicode_escape = true
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i = i + 6
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else
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if not decode_escape_set[nx] then
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statusPos = i
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decode_error("invalid escape char '" .. (nx and string_char(nx) or "<eol>") .. "' in string")
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end
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has_escape = true
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i = i + 2
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end
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end
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end
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local function decode_number()
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local num, c = string_match(statusBuf, '^([0-9]+%.?[0-9]*)([eE]?)', statusPos)
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if not num or string_byte(num, -1) == 0x2E --[[ "." ]] then
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decode_error("invalid number '" .. get_word() .. "'")
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end
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if c ~= '' then
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num = string_match(statusBuf, '^([^eE]*[eE][-+]?[0-9]+)[ \t\r\n%]},]', statusPos)
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if not num then
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decode_error("invalid number '" .. get_word() .. "'")
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end
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end
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statusPos = statusPos + #num
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return tonumber(num)
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end
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local function decode_number_zero()
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local num, c = string_match(statusBuf, '^(.%.?[0-9]*)([eE]?)', statusPos)
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if not num or string_byte(num, -1) == 0x2E --[[ "." ]] or string_match(statusBuf, '^.[0-9]+', statusPos) then
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decode_error("invalid number '" .. get_word() .. "'")
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end
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if c ~= '' then
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num = string_match(statusBuf, '^([^eE]*[eE][-+]?[0-9]+)[ \t\r\n%]},]', statusPos)
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if not num then
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decode_error("invalid number '" .. get_word() .. "'")
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end
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end
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statusPos = statusPos + #num
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return tonumber(num)
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end
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local function decode_number_negative()
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statusPos = statusPos + 1
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local c = string_byte(statusBuf, statusPos)
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if c then
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if c == 0x30 then
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return -decode_number_zero()
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elseif c > 0x30 and c < 0x3A then
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return -decode_number()
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end
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end
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decode_error("invalid number '" .. get_word() .. "'")
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end
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local function decode_true()
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if string_sub(statusBuf, statusPos, statusPos+3) ~= "true" then
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decode_error("invalid literal '" .. get_word() .. "'")
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end
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statusPos = statusPos + 4
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return true
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end
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local function decode_false()
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if string_sub(statusBuf, statusPos, statusPos+4) ~= "false" then
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decode_error("invalid literal '" .. get_word() .. "'")
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end
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statusPos = statusPos + 5
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return false
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end
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local function decode_null()
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if string_sub(statusBuf, statusPos, statusPos+3) ~= "null" then
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decode_error("invalid literal '" .. get_word() .. "'")
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end
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statusPos = statusPos + 4
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return json.null
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end
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local function decode_array()
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statusPos = statusPos + 1
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local res = {}
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if consume_byte "^[ \t\r\n]*%]" then
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return res
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end
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statusTop = statusTop + 1
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statusAry[statusTop] = true
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statusRef[statusTop] = res
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return res
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end
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local function decode_object()
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statusPos = statusPos + 1
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local res = {}
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if consume_byte "^[ \t\r\n]*}" then
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return setmetatable(res, json.object)
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end
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statusTop = statusTop + 1
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statusAry[statusTop] = false
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statusRef[statusTop] = res
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return res
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end
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local decode_uncompleted_map = {
|
||
|
|
[ string_byte '"' ] = decode_string,
|
||
|
|
[ string_byte "0" ] = decode_number_zero,
|
||
|
|
[ string_byte "1" ] = decode_number,
|
||
|
|
[ string_byte "2" ] = decode_number,
|
||
|
|
[ string_byte "3" ] = decode_number,
|
||
|
|
[ string_byte "4" ] = decode_number,
|
||
|
|
[ string_byte "5" ] = decode_number,
|
||
|
|
[ string_byte "6" ] = decode_number,
|
||
|
|
[ string_byte "7" ] = decode_number,
|
||
|
|
[ string_byte "8" ] = decode_number,
|
||
|
|
[ string_byte "9" ] = decode_number,
|
||
|
|
[ string_byte "-" ] = decode_number_negative,
|
||
|
|
[ string_byte "t" ] = decode_true,
|
||
|
|
[ string_byte "f" ] = decode_false,
|
||
|
|
[ string_byte "n" ] = decode_null,
|
||
|
|
[ string_byte "[" ] = decode_array,
|
||
|
|
[ string_byte "{" ] = decode_object,
|
||
|
|
}
|
||
|
|
local function unexpected_character()
|
||
|
|
decode_error("unexpected character '" .. string_sub(statusBuf, statusPos, statusPos) .. "'")
|
||
|
|
end
|
||
|
|
local function unexpected_eol()
|
||
|
|
decode_error("unexpected character '<eol>'")
|
||
|
|
end
|
||
|
|
|
||
|
|
local decode_map = {}
|
||
|
|
for i = 0, 255 do
|
||
|
|
decode_map[i] = decode_uncompleted_map[i] or unexpected_character
|
||
|
|
end
|
||
|
|
decode_map[-1] = unexpected_eol
|
||
|
|
|
||
|
|
local function decode()
|
||
|
|
return decode_map[next_byte()]()
|
||
|
|
end
|
||
|
|
|
||
|
|
local function decode_item()
|
||
|
|
local top = statusTop
|
||
|
|
local ref = statusRef[top]
|
||
|
|
if statusAry[top] then
|
||
|
|
ref[#ref+1] = decode()
|
||
|
|
else
|
||
|
|
expect_byte '^[ \t\r\n]*"'
|
||
|
|
local key = decode_string()
|
||
|
|
expect_byte '^[ \t\r\n]*:'
|
||
|
|
statusPos = statusPos + 1
|
||
|
|
ref[key] = decode()
|
||
|
|
end
|
||
|
|
if top == statusTop then
|
||
|
|
repeat
|
||
|
|
local chr = next_byte(); statusPos = statusPos + 1
|
||
|
|
if chr == 44 --[[ "," ]] then
|
||
|
|
return
|
||
|
|
end
|
||
|
|
if statusAry[statusTop] then
|
||
|
|
if chr ~= 93 --[[ "]" ]] then decode_error "expected ']' or ','" end
|
||
|
|
else
|
||
|
|
if chr ~= 125 --[[ "}" ]] then decode_error "expected '}' or ','" end
|
||
|
|
end
|
||
|
|
statusTop = statusTop - 1
|
||
|
|
until statusTop == 0
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
function json.decode(str)
|
||
|
|
if type(str) ~= "string" then
|
||
|
|
error("expected argument of type string, got " .. type(str))
|
||
|
|
end
|
||
|
|
statusBuf = str
|
||
|
|
statusPos = 1
|
||
|
|
statusTop = 0
|
||
|
|
local res = decode()
|
||
|
|
while statusTop > 0 do
|
||
|
|
decode_item()
|
||
|
|
end
|
||
|
|
if string_find(statusBuf, "[^ \t\r\n]", statusPos) then
|
||
|
|
decode_error "trailing garbage"
|
||
|
|
end
|
||
|
|
return res
|
||
|
|
end
|
||
|
|
|
||
|
|
-- Generate a lightuserdata
|
||
|
|
json.null = debug.upvalueid(decode, 1)
|
||
|
|
|
||
|
|
return json
|