New page wikitext, after the edit (new_wikitext) | '--
-- json.lua
-- https://github.com/rxi/json.lua
--
-- Copyright (c) 2019 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 = "0.1.2" }
-------------------------------------------------------------------------------
-- Encode
-------------------------------------------------------------------------------
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 {}
-- Circular reference?
if stack[val] then error("circular reference") end
stack[val] = true
if rawget(val, 1) ~= nil or next(val) == nil then
-- Treat as array -- check keys are valid and it is not sparse
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
-- Encode
for i, v in ipairs(val) do
table.insert(res, encode(v, stack))
end
stack[val] = nil
return "[" .. table.concat(res, ",") .. "]"
else
-- Treat as an object
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)
-- Check for NaN, -inf and inf
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
-------------------------------------------------------------------------------
-- Decode
-------------------------------------------------------------------------------
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)
-- http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=iws-appendixa
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 )
-- Surrogate pair?
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 -- "\\" (escape char)
if x == 117 then -- "u" (unicode escape sequence)
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 -- '"' (end of string)
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)
-- Empty / end of array?
if str:sub(i, i) == "]" then
i = i + 1
break
end
-- Read token
x, i = parse(str, i)
res[n] = x
n = n + 1
-- Next token
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)
-- Empty / end of object?
if str:sub(i, i) == "}" then
i = i + 1
break
end
-- Read key
if str:sub(i, i) ~= '"' then
decode_error(str, i, "expected string for key")
end
key, i = parse(str, i)
-- Read ':' delimiter
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)
-- Read value
val, i = parse(str, i)
-- Set
res[key] = val
-- Next token
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' |
Unified diff of changes made by edit (edit_diff) | '@@ -1,0 +1,401 @@
+--
+-- json.lua
+-- https://github.com/rxi/json.lua
+--
+-- Copyright (c) 2019 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 = "0.1.2" }
+
+-------------------------------------------------------------------------------
+-- Encode
+-------------------------------------------------------------------------------
+
+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 {}
+
+ -- Circular reference?
+ if stack[val] then error("circular reference") end
+
+ stack[val] = true
+
+ if rawget(val, 1) ~= nil or next(val) == nil then
+ -- Treat as array -- check keys are valid and it is not sparse
+ 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
+ -- Encode
+ for i, v in ipairs(val) do
+ table.insert(res, encode(v, stack))
+ end
+ stack[val] = nil
+ return "[" .. table.concat(res, ",") .. "]"
+
+ else
+ -- Treat as an object
+ 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)
+ -- Check for NaN, -inf and inf
+ 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
+
+
+-------------------------------------------------------------------------------
+-- Decode
+-------------------------------------------------------------------------------
+
+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)
+ -- http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=iws-appendixa
+ 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 )
+ -- Surrogate pair?
+ 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 -- "\\" (escape char)
+ if x == 117 then -- "u" (unicode escape sequence)
+ 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 -- '"' (end of string)
+ 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)
+ -- Empty / end of array?
+ if str:sub(i, i) == "]" then
+ i = i + 1
+ break
+ end
+ -- Read token
+ x, i = parse(str, i)
+ res[n] = x
+ n = n + 1
+ -- Next token
+ 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)
+ -- Empty / end of object?
+ if str:sub(i, i) == "}" then
+ i = i + 1
+ break
+ end
+ -- Read key
+ if str:sub(i, i) ~= '"' then
+ decode_error(str, i, "expected string for key")
+ end
+ key, i = parse(str, i)
+ -- Read ':' delimiter
+ 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)
+ -- Read value
+ val, i = parse(str, i)
+ -- Set
+ res[key] = val
+ -- Next token
+ 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
' |
Lines added in edit (added_lines) | [
0 => '--',
1 => '-- json.lua',
2 => '-- https://github.com/rxi/json.lua',
3 => '--',
4 => '-- Copyright (c) 2019 rxi',
5 => '--',
6 => '-- Permission is hereby granted, free of charge, to any person obtaining a copy of',
7 => '-- this software and associated documentation files (the "Software"), to deal in',
8 => '-- the Software without restriction, including without limitation the rights to',
9 => '-- use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies',
10 => '-- of the Software, and to permit persons to whom the Software is furnished to do',
11 => '-- so, subject to the following conditions:',
12 => '--',
13 => '-- The above copyright notice and this permission notice shall be included in all',
14 => '-- copies or substantial portions of the Software.',
15 => '--',
16 => '-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR',
17 => '-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,',
18 => '-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE',
19 => '-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER',
20 => '-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,',
21 => '-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE',
22 => '-- SOFTWARE.',
23 => '--',
24 => '',
25 => 'local json = { _version = "0.1.2" }',
26 => '',
27 => '-------------------------------------------------------------------------------',
28 => '-- Encode',
29 => '-------------------------------------------------------------------------------',
30 => '',
31 => 'local encode',
32 => '',
33 => 'local escape_char_map = {',
34 => ' [ "\\" ] = "\\\\",',
35 => ' [ "\"" ] = "\\\"",',
36 => ' [ "\b" ] = "\\b",',
37 => ' [ "\f" ] = "\\f",',
38 => ' [ "\n" ] = "\\n",',
39 => ' [ "\r" ] = "\\r",',
40 => ' [ "\t" ] = "\\t",',
41 => '}',
42 => '',
43 => 'local escape_char_map_inv = { [ "\\/" ] = "/" }',
44 => 'for k, v in pairs(escape_char_map) do',
45 => ' escape_char_map_inv[v] = k',
46 => 'end',
47 => '',
48 => '',
49 => 'local function escape_char(c)',
50 => ' return escape_char_map[c] or string.format("\\u%04x", c:byte())',
51 => 'end',
52 => '',
53 => '',
54 => 'local function encode_nil(val)',
55 => ' return "null"',
56 => 'end',
57 => '',
58 => '',
59 => 'local function encode_table(val, stack)',
60 => ' local res = {}',
61 => ' stack = stack or {}',
62 => '',
63 => ' -- Circular reference?',
64 => ' if stack[val] then error("circular reference") end',
65 => '',
66 => ' stack[val] = true',
67 => '',
68 => ' if rawget(val, 1) ~= nil or next(val) == nil then',
69 => ' -- Treat as array -- check keys are valid and it is not sparse',
70 => ' local n = 0',
71 => ' for k in pairs(val) do',
72 => ' if type(k) ~= "number" then',
73 => ' error("invalid table: mixed or invalid key types")',
74 => ' end',
75 => ' n = n + 1',
76 => ' end',
77 => ' if n ~= #val then',
78 => ' error("invalid table: sparse array")',
79 => ' end',
80 => ' -- Encode',
81 => ' for i, v in ipairs(val) do',
82 => ' table.insert(res, encode(v, stack))',
83 => ' end',
84 => ' stack[val] = nil',
85 => ' return "[" .. table.concat(res, ",") .. "]"',
86 => '',
87 => ' else',
88 => ' -- Treat as an object',
89 => ' for k, v in pairs(val) do',
90 => ' if type(k) ~= "string" then',
91 => ' error("invalid table: mixed or invalid key types")',
92 => ' end',
93 => ' table.insert(res, encode(k, stack) .. ":" .. encode(v, stack))',
94 => ' end',
95 => ' stack[val] = nil',
96 => ' return "{" .. table.concat(res, ",") .. "}"',
97 => ' end',
98 => 'end',
99 => '',
100 => '',
101 => 'local function encode_string(val)',
102 => ' return '"' .. val:gsub('[%z\1-\31\\"]', escape_char) .. '"'',
103 => 'end',
104 => '',
105 => '',
106 => 'local function encode_number(val)',
107 => ' -- Check for NaN, -inf and inf',
108 => ' if val ~= val or val <= -math.huge or val >= math.huge then',
109 => ' error("unexpected number value '" .. tostring(val) .. "'")',
110 => ' end',
111 => ' return string.format("%.14g", val)',
112 => 'end',
113 => '',
114 => '',
115 => 'local type_func_map = {',
116 => ' [ "nil" ] = encode_nil,',
117 => ' [ "table" ] = encode_table,',
118 => ' [ "string" ] = encode_string,',
119 => ' [ "number" ] = encode_number,',
120 => ' [ "boolean" ] = tostring,',
121 => '}',
122 => '',
123 => '',
124 => 'encode = function(val, stack)',
125 => ' local t = type(val)',
126 => ' local f = type_func_map[t]',
127 => ' if f then',
128 => ' return f(val, stack)',
129 => ' end',
130 => ' error("unexpected type '" .. t .. "'")',
131 => 'end',
132 => '',
133 => '',
134 => 'function json.encode(val)',
135 => ' return ( encode(val) )',
136 => 'end',
137 => '',
138 => '',
139 => '-------------------------------------------------------------------------------',
140 => '-- Decode',
141 => '-------------------------------------------------------------------------------',
142 => '',
143 => 'local parse',
144 => '',
145 => 'local function create_set(...)',
146 => ' local res = {}',
147 => ' for i = 1, select("#", ...) do',
148 => ' res[ select(i, ...) ] = true',
149 => ' end',
150 => ' return res',
151 => 'end',
152 => '',
153 => 'local space_chars = create_set(" ", "\t", "\r", "\n")',
154 => 'local delim_chars = create_set(" ", "\t", "\r", "\n", "]", "}", ",")',
155 => 'local escape_chars = create_set("\\", "/", '"', "b", "f", "n", "r", "t", "u")',
156 => 'local literals = create_set("true", "false", "null")',
157 => '',
158 => 'local literal_map = {',
159 => ' [ "true" ] = true,',
160 => ' [ "false" ] = false,',
161 => ' [ "null" ] = nil,',
162 => '}',
163 => '',
164 => '',
165 => 'local function next_char(str, idx, set, negate)',
166 => ' for i = idx, #str do',
167 => ' if set[str:sub(i, i)] ~= negate then',
168 => ' return i',
169 => ' end',
170 => ' end',
171 => ' return #str + 1',
172 => 'end',
173 => '',
174 => '',
175 => 'local function decode_error(str, idx, msg)',
176 => ' local line_count = 1',
177 => ' local col_count = 1',
178 => ' for i = 1, idx - 1 do',
179 => ' col_count = col_count + 1',
180 => ' if str:sub(i, i) == "\n" then',
181 => ' line_count = line_count + 1',
182 => ' col_count = 1',
183 => ' end',
184 => ' end',
185 => ' error( string.format("%s at line %d col %d", msg, line_count, col_count) )',
186 => 'end',
187 => '',
188 => '',
189 => 'local function codepoint_to_utf8(n)',
190 => ' -- http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=iws-appendixa',
191 => ' local f = math.floor',
192 => ' if n <= 0x7f then',
193 => ' return string.char(n)',
194 => ' elseif n <= 0x7ff then',
195 => ' return string.char(f(n / 64) + 192, n % 64 + 128)',
196 => ' elseif n <= 0xffff then',
197 => ' return string.char(f(n / 4096) + 224, f(n % 4096 / 64) + 128, n % 64 + 128)',
198 => ' elseif n <= 0x10ffff then',
199 => ' return string.char(f(n / 262144) + 240, f(n % 262144 / 4096) + 128,',
200 => ' f(n % 4096 / 64) + 128, n % 64 + 128)',
201 => ' end',
202 => ' error( string.format("invalid unicode codepoint '%x'", n) )',
203 => 'end',
204 => '',
205 => '',
206 => 'local function parse_unicode_escape(s)',
207 => ' local n1 = tonumber( s:sub(3, 6), 16 )',
208 => ' local n2 = tonumber( s:sub(9, 12), 16 )',
209 => ' -- Surrogate pair?',
210 => ' if n2 then',
211 => ' return codepoint_to_utf8((n1 - 0xd800) * 0x400 + (n2 - 0xdc00) + 0x10000)',
212 => ' else',
213 => ' return codepoint_to_utf8(n1)',
214 => ' end',
215 => 'end',
216 => '',
217 => '',
218 => 'local function parse_string(str, i)',
219 => ' local has_unicode_escape = false',
220 => ' local has_surrogate_escape = false',
221 => ' local has_escape = false',
222 => ' local last',
223 => ' for j = i + 1, #str do',
224 => ' local x = str:byte(j)',
225 => '',
226 => ' if x < 32 then',
227 => ' decode_error(str, j, "control character in string")',
228 => ' end',
229 => '',
230 => ' if last == 92 then -- "\\" (escape char)',
231 => ' if x == 117 then -- "u" (unicode escape sequence)',
232 => ' local hex = str:sub(j + 1, j + 5)',
233 => ' if not hex:find("%x%x%x%x") then',
234 => ' decode_error(str, j, "invalid unicode escape in string")',
235 => ' end',
236 => ' if hex:find("^[dD][89aAbB]") then',
237 => ' has_surrogate_escape = true',
238 => ' else',
239 => ' has_unicode_escape = true',
240 => ' end',
241 => ' else',
242 => ' local c = string.char(x)',
243 => ' if not escape_chars[c] then',
244 => ' decode_error(str, j, "invalid escape char '" .. c .. "' in string")',
245 => ' end',
246 => ' has_escape = true',
247 => ' end',
248 => ' last = nil',
249 => '',
250 => ' elseif x == 34 then -- '"' (end of string)',
251 => ' local s = str:sub(i + 1, j - 1)',
252 => ' if has_surrogate_escape then',
253 => ' s = s:gsub("\\u[dD][89aAbB]..\\u....", parse_unicode_escape)',
254 => ' end',
255 => ' if has_unicode_escape then',
256 => ' s = s:gsub("\\u....", parse_unicode_escape)',
257 => ' end',
258 => ' if has_escape then',
259 => ' s = s:gsub("\\.", escape_char_map_inv)',
260 => ' end',
261 => ' return s, j + 1',
262 => '',
263 => ' else',
264 => ' last = x',
265 => ' end',
266 => ' end',
267 => ' decode_error(str, i, "expected closing quote for string")',
268 => 'end',
269 => '',
270 => '',
271 => 'local function parse_number(str, i)',
272 => ' local x = next_char(str, i, delim_chars)',
273 => ' local s = str:sub(i, x - 1)',
274 => ' local n = tonumber(s)',
275 => ' if not n then',
276 => ' decode_error(str, i, "invalid number '" .. s .. "'")',
277 => ' end',
278 => ' return n, x',
279 => 'end',
280 => '',
281 => '',
282 => 'local function parse_literal(str, i)',
283 => ' local x = next_char(str, i, delim_chars)',
284 => ' local word = str:sub(i, x - 1)',
285 => ' if not literals[word] then',
286 => ' decode_error(str, i, "invalid literal '" .. word .. "'")',
287 => ' end',
288 => ' return literal_map[word], x',
289 => 'end',
290 => '',
291 => '',
292 => 'local function parse_array(str, i)',
293 => ' local res = {}',
294 => ' local n = 1',
295 => ' i = i + 1',
296 => ' while 1 do',
297 => ' local x',
298 => ' i = next_char(str, i, space_chars, true)',
299 => ' -- Empty / end of array?',
300 => ' if str:sub(i, i) == "]" then',
301 => ' i = i + 1',
302 => ' break',
303 => ' end',
304 => ' -- Read token',
305 => ' x, i = parse(str, i)',
306 => ' res[n] = x',
307 => ' n = n + 1',
308 => ' -- Next token',
309 => ' i = next_char(str, i, space_chars, true)',
310 => ' local chr = str:sub(i, i)',
311 => ' i = i + 1',
312 => ' if chr == "]" then break end',
313 => ' if chr ~= "," then decode_error(str, i, "expected ']' or ','") end',
314 => ' end',
315 => ' return res, i',
316 => 'end',
317 => '',
318 => '',
319 => 'local function parse_object(str, i)',
320 => ' local res = {}',
321 => ' i = i + 1',
322 => ' while 1 do',
323 => ' local key, val',
324 => ' i = next_char(str, i, space_chars, true)',
325 => ' -- Empty / end of object?',
326 => ' if str:sub(i, i) == "}" then',
327 => ' i = i + 1',
328 => ' break',
329 => ' end',
330 => ' -- Read key',
331 => ' if str:sub(i, i) ~= '"' then',
332 => ' decode_error(str, i, "expected string for key")',
333 => ' end',
334 => ' key, i = parse(str, i)',
335 => ' -- Read ':' delimiter',
336 => ' i = next_char(str, i, space_chars, true)',
337 => ' if str:sub(i, i) ~= ":" then',
338 => ' decode_error(str, i, "expected ':' after key")',
339 => ' end',
340 => ' i = next_char(str, i + 1, space_chars, true)',
341 => ' -- Read value',
342 => ' val, i = parse(str, i)',
343 => ' -- Set',
344 => ' res[key] = val',
345 => ' -- Next token',
346 => ' i = next_char(str, i, space_chars, true)',
347 => ' local chr = str:sub(i, i)',
348 => ' i = i + 1',
349 => ' if chr == "}" then break end',
350 => ' if chr ~= "," then decode_error(str, i, "expected '}' or ','") end',
351 => ' end',
352 => ' return res, i',
353 => 'end',
354 => '',
355 => '',
356 => 'local char_func_map = {',
357 => ' [ '"' ] = parse_string,',
358 => ' [ "0" ] = parse_number,',
359 => ' [ "1" ] = parse_number,',
360 => ' [ "2" ] = parse_number,',
361 => ' [ "3" ] = parse_number,',
362 => ' [ "4" ] = parse_number,',
363 => ' [ "5" ] = parse_number,',
364 => ' [ "6" ] = parse_number,',
365 => ' [ "7" ] = parse_number,',
366 => ' [ "8" ] = parse_number,',
367 => ' [ "9" ] = parse_number,',
368 => ' [ "-" ] = parse_number,',
369 => ' [ "t" ] = parse_literal,',
370 => ' [ "f" ] = parse_literal,',
371 => ' [ "n" ] = parse_literal,',
372 => ' [ "[" ] = parse_array,',
373 => ' [ "{" ] = parse_object,',
374 => '}',
375 => '',
376 => '',
377 => 'parse = function(str, idx)',
378 => ' local chr = str:sub(idx, idx)',
379 => ' local f = char_func_map[chr]',
380 => ' if f then',
381 => ' return f(str, idx)',
382 => ' end',
383 => ' decode_error(str, idx, "unexpected character '" .. chr .. "'")',
384 => 'end',
385 => '',
386 => '',
387 => 'function json.decode(str)',
388 => ' if type(str) ~= "string" then',
389 => ' error("expected argument of type string, got " .. type(str))',
390 => ' end',
391 => ' local res, idx = parse(str, next_char(str, 1, space_chars, true))',
392 => ' idx = next_char(str, idx, space_chars, true)',
393 => ' if idx <= #str then',
394 => ' decode_error(str, idx, "trailing garbage")',
395 => ' end',
396 => ' return res',
397 => 'end',
398 => '',
399 => '',
400 => 'return json'
] |
