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local lpeg = require 'lpeglabel'
local tablePack = table.pack
local rawset = rawset
local tointeger = math.tointeger
local tonumber = tonumber
local setmetatable = setmetatable
local stringChar = string.char
local error = error
_ENV = nil
local SaveSort
local P = lpeg.P
local S = lpeg.S
local R = lpeg.R
local V = lpeg.V
local C = lpeg.C
local Ct = lpeg.Ct
local Cc = lpeg.Cc
local Cp = lpeg.Cp
local Cs = lpeg.Cs
local EscMap = {
['t'] = '\t',
['r'] = '\r',
['n'] = '\n',
['"'] = '"',
['\\'] = '\\',
}
local BoolMap = {
['true'] = true,
['false'] = false,
}
local hashmt = {
__pairs = function (self)
local i = 1
local function next()
i = i + 1
local k = self[i]
if k == nil then
return
end
local v = self[k]
if v == nil then
return next()
end
return k, v
end
return next
end,
__newindex = function (self, k, v)
local i = 2
while self[i] do
i = i + 1
end
rawset(self, i, k)
rawset(self, k, v)
end,
}
-----------------------------------------------------------------------------
-- JSON4Lua: JSON encoding / decoding support for the Lua language.
-- json Module.
-- Author: Craig Mason-Jones
-- Homepage: http://github.com/craigmj/json4lua/
-- Version: 1.0.0
-- This module is released under the MIT License (MIT).
-- Please see LICENCE.txt for details.
--
local function Utf8(str)
local n = tonumber(str, 16)
-- math.floor(x/2^y) == lazy right shift
-- a % 2^b == bitwise_and(a, (2^b)-1)
-- 64 = 2^6
-- 4096 = 2^12 (or 2^6 * 2^6)
local x
if n < 0x80 then
x = stringChar(n % 0x80)
elseif n < 0x800 then
-- [110x xxxx] [10xx xxxx]
x = stringChar(0xC0 + ((n // 64) % 0x20), 0x80 + (n % 0x40))
else
-- [1110 xxxx] [10xx xxxx] [10xx xxxx]
x = stringChar(0xE0 + ((n // 4096) % 0x10), 0x80 + ((n // 64) % 0x40), 0x80 + (n % 0x40))
end
return x
end
local function HashTable(patt)
return C(patt) / function (_, ...)
local hash = tablePack(...)
local n = hash.n
hash.n = nil
if SaveSort then
local max = n // 2
for i = 1, max do
local key, value = hash[2*i-1], hash[2*i]
hash[key] = value
hash[i+1] = key
end
hash[1] = nil
for i = max+2, max*2 do
hash[i] = nil
end
return setmetatable(hash, hashmt)
else
local max = n // 2
for i = 1, max do
local a = 2*i-1
local b = 2*i
local key, value = hash[a], hash[b]
hash[key] = value
hash[a] = nil
hash[b] = nil
end
return hash
end
end
end
local Token = P
{
V'Value' * Cp(),
Nl = P'\r\n' + S'\r\n',
Sp = S' \t' + '//' * (1-V'Nl')^0,
Spnl = (V'Sp' + V'Nl')^0,
Bool = C(P'true' + P'false') / BoolMap,
Int = C('0' + (P'-'^-1 * R'19' * R'09'^0)) / tointeger,
Float = C(P'-'^-1 * ('0' + R'19' * R'09'^0) * '.' * R'09'^0) / tonumber,
Null = P'null' * Cc(nil),
String = '"' * Cs(V'Char'^0) * '"',
Char = V'Esc' + V'Utf8' + (1 - P'"' - P'\t' - V'Nl'),
Esc = P'\\' * C(S'tnr"\\') / EscMap,
Utf8 = P'\\u' * C(P(4)) / Utf8,
Hash = V'Spnl' * '{' * V'Spnl' * HashTable((V'Object' + P',' * V'Spnl')^0) * V'Spnl' * P'}' * V'Spnl',
Array = V'Spnl' * '[' * V'Spnl' * Ct((V'Value' * V'Spnl' + P',' * V'Spnl')^0) * V'Spnl' * P']' * V'Spnl',
Object = V'Spnl' * V'Key' * V'Spnl' * V'Value' * V'Spnl',
Key = V'String' * V'Spnl' * ':',
Value = V'Hash' + V'Array' + V'Bool' + V'Null' + V'String' + V'Float' + V'Int',
}
return function (str, save_sort_)
SaveSort = save_sort_
local table, res, pos = Token:match(str)
if not table then
if not pos or pos <= #str then
pos = pos or 1
error(('没匹配完[%s][%s]\n%s'):format(pos, res, str:sub(pos, pos+100)))
end
end
return table
end
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