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local rep = string.rep
local format = string.format
local gsub = string.gsub
local sub = string.sub
local sort = table.sort
local find = string.find
local tostring = tostring
local getmetatable = debug.getmetatable
local type = type
local next = next
local ipairs = ipairs
local index
local lines
local n = -1
local tabs = {}
local esc_map = {
['\\'] = '\\\\',
['\r'] = '\\r',
['\n'] = '\\n',
['\t'] = '\\t',
['"'] = '\\"',
}
local function encode(data, key)
n = n + 1
if not tabs[n] then
tabs[n] = rep(' ', n)
end
local tp = type(data)
if tp == 'table' then
if not data[1] and next(data) then
-- 认为这个是哈希表
if key then
index=index+1;lines[index] = tabs[n] .. '"' .. gsub(key, '[\\\r\n\t"]', esc_map) .. '": {\n'
else
index=index+1;lines[index] = tabs[n] .. '{\n'
end
local meta = getmetatable(data)
local sep
if meta and meta.__pairs then
for k, v in meta.__pairs(data), data do
if encode(v, k) then
index=index+1;lines[index] = ',\n'
sep = true
end
end
else
local list = {}
local i = 0
for k in next, data do
i=i+1;list[i] = k
end
sort(list)
for j = 1, i do
local k = list[j]
if encode(data[k], k) then
index=index+1;lines[index] = ',\n'
sep = true
end
end
end
if sep then
lines[index] = '\n'
end
index=index+1;lines[index] = tabs[n] .. '}'
else
-- 认为这个是数组
if key then
index=index+1;lines[index] = tabs[n] .. '"' .. gsub(key, '[\\\r\n\t"]', esc_map) .. '": [\n'
else
index=index+1;lines[index] = tabs[n] .. '[\n'
end
local sep
for k, v in pairs(data) do
if encode(v) then
index=index+1;lines[index] = ',\n'
sep = true
end
end
if sep then
lines[index] = '\n'
end
index=index+1;lines[index] = tabs[n] .. ']'
end
elseif tp == 'number' then
data = tostring(data)
-- 判断 inf -inf -nan(ind) 1.#INF -1.#INF -1.#IND
if find(data, '%a') then
data = '0'
end
if key then
index=index+1;lines[index] = tabs[n] .. '"' .. gsub(key, '[\\\r\n\t"]', esc_map) .. '": ' .. data
else
index=index+1;lines[index] = tabs[n] .. data
end
elseif tp == 'boolean' then
if key then
index=index+1;lines[index] = tabs[n] .. '"' .. gsub(key, '[\\\r\n\t"]', esc_map) .. '": ' .. tostring(data)
else
index=index+1;lines[index] = tabs[n] .. tostring(data)
end
elseif tp == 'nil' then
if key then
index=index+1;lines[index] = tabs[n] .. '"' .. gsub(key, '[\\\r\n\t"]', esc_map) .. '": null'
else
index=index+1;lines[index] = tabs[n] .. 'null'
end
elseif tp == 'string' then
local str = gsub(data, '[\\\r\n\t"]', esc_map)
if key then
index=index+1;lines[index] = tabs[n] .. '"' .. gsub(key, '[\\\r\n\t"]', esc_map) .. '": "' .. str .. '"'
else
index=index+1;lines[index] = tabs[n] .. '"' .. str .. '"'
end
else
n = n - 1
return false
end
n = n - 1
return true
end
local function json(t)
lines = {}
index = 0
encode(t)
return table.concat(lines)
end
return json
|
