@@ 0,0 1,25 @@
+--
+-- json.lua
+--
+-- Copyright (c) 2018 rxi
+--
+-- Permission is hereby granted, free of charge, to any person obtaining a copy of
+-- this software and associated documentation files (the "Software"), to deal in
+-- the Software without restriction, including without limitation the rights to
+-- use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+-- of the Software, and to permit persons to whom the Software is furnished to do
+-- so, subject to the following conditions:
+--
+-- The above copyright notice and this permission notice shall be included in all
+-- copies or substantial portions of the Software.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+-- SOFTWARE.
+--
+
+local json = { _version = "0.1.1" } local encode local escape_char_map = { [ "\\" ] = "\\\\", [ "\"" ] = "\\\"", [ "\b" ] = "\\b", [ "\f" ] = "\\f", [ "\n" ] = "\\n", [ "\r" ] = "\\r", [ "\t" ] = "\\t", } local escape_char_map_inv = { [ "\\/" ] = "/" } for k, v in pairs(escape_char_map) do escape_char_map_inv[v] = k end local function escape_char(c) return escape_char_map[c] or string.format("\\u%04x", c:byte()) end local function encode_nil(val) return "null" end local function encode_table(val, stack) local res = {} stack = stack or {} if stack[val] then error("circular reference") end stack[val] = true if val[1] ~= nil or next(val) == nil then local n = 0 for k in pairs(val) do if type(k) ~= "number" then error("invalid table: mixed or invalid key types") end n = n + 1 end if n ~= #val then error("invalid table: sparse array") end for i, v in ipairs(val) do table.insert(res, encode(v, stack)) end stack[val] = nil return "[" .. table.concat(res, ",") .. "]" else for k, v in pairs(val) do if type(k) ~= "string" then error("invalid table: mixed or invalid key types") end table.insert(res, encode(k, stack) .. ":" .. encode(v, stack)) end stack[val] = nil return "{" .. table.concat(res, ",") .. "}" end end local function encode_string(val) return '"' .. val:gsub('[%z\1-\31\\"]', escape_char) .. '"' end local function encode_number(val) if val ~= val or val <= -math.huge or val >= math.huge then error("unexpected number value '" .. tostring(val) .. "'") end return string.format("%.14g", val) end local type_func_map = { [ "nil" ] = encode_nil, [ "table" ] = encode_table, [ "string" ] = encode_string, [ "number" ] = encode_number, [ "boolean" ] = tostring, } encode = function(val, stack) local t = type(val) local f = type_func_map[t] if f then return f(val, stack) end error("unexpected type '" .. t .. "'") end function json.encode(val) return ( encode(val) ) end local parse local function create_set(...) local res = {} for i = 1, select("#", ...) do res[ select(i, ...) ] = true end return res end local space_chars = create_set(" ", "\t", "\r", "\n") local delim_chars = create_set(" ", "\t", "\r", "\n", "]", "}", ",") local escape_chars = create_set("\\", "/", '"', "b", "f", "n", "r", "t", "u") local literals = create_set("true", "false", "null") local literal_map = { [ "true" ] = true, [ "false" ] = false, [ "null" ] = nil, } local function next_char(str, idx, set, negate) for i = idx, #str do if set[str:sub(i, i)] ~= negate then return i end end return #str + 1 end local function decode_error(str, idx, msg) local line_count = 1 local col_count = 1 for i = 1, idx - 1 do col_count = col_count + 1 if str:sub(i, i) == "\n" then line_count = line_count + 1 col_count = 1 end end error( string.format("%s at line %d col %d", msg, line_count, col_count) ) end local function codepoint_to_utf8(n) local f = math.floor if n <= 0x7f then return string.char(n) elseif n <= 0x7ff then return string.char(f(n / 64) + 192, n % 64 + 128) elseif n <= 0xffff then return string.char(f(n / 4096) + 224, f(n % 4096 / 64) + 128, n % 64 + 128) elseif n <= 0x10ffff then return string.char(f(n / 262144) + 240, f(n % 262144 / 4096) + 128, f(n % 4096 / 64) + 128, n % 64 + 128) end error( string.format("invalid unicode codepoint '%x'", n) ) end local function parse_unicode_escape(s) local n1 = tonumber( s:sub(3, 6), 16 ) local n2 = tonumber( s:sub(9, 12), 16 ) if n2 then return codepoint_to_utf8((n1 - 0xd800) * 0x400 + (n2 - 0xdc00) + 0x10000) else return codepoint_to_utf8(n1) end end local function parse_string(str, i) local has_unicode_escape = false local has_surrogate_escape = false local has_escape = false local last for j = i + 1, #str do local x = str:byte(j) if x < 32 then decode_error(str, j, "control character in string") end if last == 92 then if x == 117 then local hex = str:sub(j + 1, j + 5) if not hex:find("%x%x%x%x") then decode_error(str, j, "invalid unicode escape in string") end if hex:find("^[dD][89aAbB]") then has_surrogate_escape = true else has_unicode_escape = true end else local c = string.char(x) if not escape_chars[c] then decode_error(str, j, "invalid escape char '" .. c .. "' in string") end has_escape = true end last = nil elseif x == 34 then local s = str:sub(i + 1, j - 1) if has_surrogate_escape then s = s:gsub("\\u[dD][89aAbB]..\\u....", parse_unicode_escape) end if has_unicode_escape then s = s:gsub("\\u....", parse_unicode_escape) end if has_escape then s = s:gsub("\\.", escape_char_map_inv) end return s, j + 1 else last = x end end decode_error(str, i, "expected closing quote for string") end local function parse_number(str, i) local x = next_char(str, i, delim_chars) local s = str:sub(i, x - 1) local n = tonumber(s) if not n then decode_error(str, i, "invalid number '" .. s .. "'") end return n, x end local function parse_literal(str, i) local x = next_char(str, i, delim_chars) local word = str:sub(i, x - 1) if not literals[word] then decode_error(str, i, "invalid literal '" .. word .. "'") end return literal_map[word], x end local function parse_array(str, i) local res = {} local n = 1 i = i + 1 while 1 do local x i = next_char(str, i, space_chars, true) if str:sub(i, i) == "]" then i = i + 1 break end x, i = parse(str, i) res[n] = x n = n + 1 i = next_char(str, i, space_chars, true) local chr = str:sub(i, i) i = i + 1 if chr == "]" then break end if chr ~= "," then decode_error(str, i, "expected ']' or ','") end end return res, i end local function parse_object(str, i) local res = {} i = i + 1 while 1 do local key, val i = next_char(str, i, space_chars, true) if str:sub(i, i) == "}" then i = i + 1 break end if str:sub(i, i) ~= '"' then decode_error(str, i, "expected string for key") end key, i = parse(str, i) i = next_char(str, i, space_chars, true) if str:sub(i, i) ~= ":" then decode_error(str, i, "expected ':' after key") end i = next_char(str, i + 1, space_chars, true) val, i = parse(str, i) res[key] = val i = next_char(str, i, space_chars, true) local chr = str:sub(i, i) i = i + 1 if chr == "}" then break end if chr ~= "," then decode_error(str, i, "expected '}' or ','") end end return res, i end local char_func_map = { [ '"' ] = parse_string, [ "0" ] = parse_number, [ "1" ] = parse_number, [ "2" ] = parse_number, [ "3" ] = parse_number, [ "4" ] = parse_number, [ "5" ] = parse_number, [ "6" ] = parse_number, [ "7" ] = parse_number, [ "8" ] = parse_number, [ "9" ] = parse_number, [ "-" ] = parse_number, [ "t" ] = parse_literal, [ "f" ] = parse_literal, [ "n" ] = parse_literal, [ "[" ] = parse_array, [ "{" ] = parse_object, } parse = function(str, idx) local chr = str:sub(idx, idx) local f = char_func_map[chr] if f then return f(str, idx) end decode_error(str, idx, "unexpected character '" .. chr .. "'") end function json.decode(str) if type(str) ~= "string" then error("expected argument of type string, got " .. type(str)) end local res, idx = parse(str, next_char(str, 1, space_chars, true)) idx = next_char(str, idx, space_chars, true) if idx <= #str then decode_error(str, idx, "trailing garbage") end return res end return json<
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