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mirror of https://github.com/rxi/json.lua.git
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Merge 62e3d71808 into dbf4b2dd2e

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DarhangeR 2023-04-29 16:42:53 +03:00 committed by GitHub
parent dbf4b2dd2e 62e3d71808
commit b907c78d2c
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3 changed files with 386 additions and 391 deletions
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1
.github/FUNDING.yml vendored
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@ -1 +0,0 @@
github: rxi

3
LICENSE
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@ -1,5 +1,4 @@
Copyright (c) 2020 rxi
Copyright (c) 2020 rxi (v0.1.2) edit by DarhangeR (v0.1.4)
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

257
json.lua
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@ -1,7 +1,7 @@
--
-- json.lua
--
-- Copyright (c) 2020 rxi
-- Copyright (c) 2020 rxi (v0.1.2) edit by DarhangeR (v0.1.4)
--
-- 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
@ -22,7 +22,8 @@
-- SOFTWARE.
--
local json = { _version = "0.1.2" }
local pairs, string_format, error, rawget, next, string_char, type, ipairs, table_concat, tostring, select, tonumber = pairs, string.format, error, rawget, next, string.char, type, ipairs, table.concat, tostring, select, tonumber
local json = { _version = "0.1.4" };
-------------------------------------------------------------------------------
-- Encode
@ -38,36 +39,28 @@ local escape_char_map = {
[ "\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
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
return "\\" .. (escape_char_map[c] or string_format("u%04x", c:byte()));
end;
local function encode_nil(rope)
rope[#rope + 1] = "null"
end;
local function encode_nil(val)
return "null"
end
local function encode_table(val, stack)
local res = {}
stack = stack or {}
local function encode_table(rope, val, stack)
-- 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
local n = 0;
for k in pairs(val) do
if type(k) ~= "number" then
error("invalid table: mixed or invalid key types")
@ -78,63 +71,77 @@ local function encode_table(val, stack)
error("invalid table: sparse array")
end
-- Encode
rope[#rope + 1] = "["
for i, v in ipairs(val) do
table.insert(res, encode(v, stack))
if i > 1 then
rope[#rope + 1] = ","
end
stack[val] = nil
return "[" .. table.concat(res, ",") .. "]"
encode(rope, v, stack)
end
rope[#rope + 1] = "]"
else
-- Treat as an object
rope[#rope + 1] = "{"
local first = true;
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))
if not first then
rope[#rope + 1] = ","
end
encode(rope, k, stack)
rope[#rope + 1] = ":"
encode(rope, v, stack)
first = false
end
rope[#rope + 1] = "}"
end
stack[val] = nil
return "{" .. table.concat(res, ",") .. "}"
end
end
end;
local function encode_string(rope, val)
rope[#rope + 1] = '"'
rope[#rope + 1] = val:gsub('[%z\1-\31\\"]', escape_char)
rope[#rope + 1] = '"'
end;
local function encode_string(val)
return '"' .. val:gsub('[%z\1-\31\\"]', escape_char) .. '"'
end
local function encode_number(val)
local function encode_number(rope, 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
-- See www.cs.berkeley.edu/~wkahan/ieee754status/IEEE754.PDF
-- 17 digits suffice to losslessly represent 64-bit IEEE754 floats
rope[#rope + 1] = ("%.17g"):format(val)
end;
local function encode_boolean(rope, val)
rope[#rope + 1] = val and "true" or "false"
end;
local type_func_map = {
[ "nil" ] = encode_nil,
[ "table" ] = encode_table,
[ "string" ] = encode_string,
[ "number" ] = encode_number,
[ "boolean" ] = tostring,
}
[ "boolean" ] = encode_boolean,
};
encode = function(val, stack)
function encode(rope, val, stack)
local t = type(val)
local f = type_func_map[t]
if f then
return f(val, stack)
local encoder = type_func_map[t]
if encoder then
return encoder(rope, val, stack)
end
error("unexpected type '" .. t .. "'")
end
end;
function json.encode(val)
return ( encode(val) )
end
local rope = {}
encode(rope, val, {})
return table_concat(rope);
end;
-------------------------------------------------------------------------------
-- Decode
@ -143,24 +150,23 @@ end
local parse
local function create_set(...)
local res = {}
local res = {};
for i = 1, select("#", ...) do
res[ select(i, ...) ] = true
end
return res
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 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
@ -168,9 +174,8 @@ local function next_char(str, idx, set, negate)
return i
end
end
return #str + 1
end
return #str + 1;
end;
local function decode_error(str, idx, msg)
local line_count = 1
@ -182,90 +187,81 @@ local function decode_error(str, idx, msg)
col_count = 1
end
end
error( string.format("%s at line %d col %d", msg, line_count, col_count) )
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
local f = math.floor;
if n <= 0x7f then
return string.char(n)
return string_char(n)
elseif n <= 0x7ff then
return string.char(f(n / 64) + 192, n % 64 + 128)
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)
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,
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
error( string_format("invalid unicode codepoint '%x'", n) )
end;
local function parse_unicode_escape(s)
local n1 = tonumber( s:sub(1, 4), 16 )
local n2 = tonumber( s:sub(7, 10), 16 )
local n1 = tonumber(s:sub(1, 4), 16);
local n2 = tonumber(s:sub(7, 10), 16);
-- Surrogate pair?
if n2 then
return codepoint_to_utf8((n1 - 0xd800) * 0x400 + (n2 - 0xdc00) + 0x10000)
return codepoint_to_utf8((n1 - 0xd800) * 0x400 + (n2 - 0xdc00) + 0x10000);
else
return codepoint_to_utf8(n1)
return codepoint_to_utf8(n1);
end
end
end;
local function parse_string(str, i)
local res = ""
local j = i + 1
local k = j
local res = {};
local j = i + 1;
local k = j;
while j <= #str do
local x = str:byte(j)
local x = str:byte(j);
if x < 32 then
decode_error(str, j, "control character in string")
elseif x == 92 then -- `\`: Escape
res = res .. str:sub(k, j - 1)
res[#res + 1] = str:sub(k, j - 1)
j = j + 1
local c = str:sub(j, j)
if c == "u" then
local hex = str:match("^[dD][89aAbB]%x%x\\u%x%x%x%x", j + 1)
or str:match("^%x%x%x%x", j + 1)
or decode_error(str, j - 1, "invalid unicode escape in string")
res = res .. parse_unicode_escape(hex)
res[#res + 1] = parse_unicode_escape(hex)
j = j + #hex
else
if not escape_chars[c] then
decode_error(str, j - 1, "invalid escape char '" .. c .. "' in string")
end
res = res .. escape_char_map_inv[c]
res[#res + 1] = escape_char_map_inv[c]
end
k = j + 1
elseif x == 34 then -- `"`: End of string
res = res .. str:sub(k, j - 1)
return res, j + 1
res[#res + 1] = str:sub(k, j - 1)
return table_concat(res), j + 1
end
j = j + 1
end
decode_error(str, i, "expected closing quote for string")
end
return table_concat(res);
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)
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
return n, x;
end;
local function parse_literal(str, i)
local x = next_char(str, i, delim_chars)
@ -273,21 +269,20 @@ local function parse_literal(str, i)
if not literals[word] then
decode_error(str, i, "invalid literal '" .. word .. "'")
end
return literal_map[word], x
end
return literal_map[word], x;
end;
local function parse_array(str, i)
local res = {}
local n = 1
local res = {};
local n = 1;
i = i + 1
while 1 do
local x
local x;
i = next_char(str, i, space_chars, true)
-- Empty / end of array?
if str:sub(i, i) == "]" then
i = i + 1
break
break;
end
-- Read token
x, i = parse(str, i)
@ -295,25 +290,28 @@ local function parse_array(str, i)
n = n + 1
-- Next token
i = next_char(str, i, space_chars, true)
local chr = str:sub(i, i)
local chr = str:sub(i, i);
i = i + 1
if chr == "]" then break end
if chr ~= "," then decode_error(str, i, "expected ']' or ','") end
if chr == "]" then
break;
end
return res, i
if chr ~= "," then
decode_error(str, i, "expected ']' or ','")
end
end
return res, i;
end;
local function parse_object(str, i)
local res = {}
local res = {};
i = i + 1
while 1 do
local key, val
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
break;
end
-- Read key
if str:sub(i, i) ~= '"' then
@ -334,12 +332,14 @@ local function parse_object(str, i)
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
if chr == "}" then
break;
end
return res, i
if chr ~= "," then
decode_error(str, i, "expected '}' or ','") end
end
return res, i;
end;
local char_func_map = {
[ '"' ] = parse_string,
@ -359,30 +359,27 @@ local char_func_map = {
[ "n" ] = parse_literal,
[ "[" ] = parse_array,
[ "{" ] = parse_object,
}
};
parse = function(str, idx)
local chr = str:sub(idx, idx)
local f = char_func_map[chr]
local chr = str:sub(idx, idx);
local f = char_func_map[chr];
if f then
return f(str, idx)
return f(str, idx);
end
decode_error(str, idx, "unexpected character '" .. chr .. "'")
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))
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 res;
end;
return json
return json;