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--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--
-- file: savetable.lua
-- brief: a human friendly table writer
-- author: Dave Rodgers
--
-- Copyright (C) 2007.
-- Licensed under the terms of the GNU GPL, v2 or later.
--
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
if (table.save) then
return
end
local indentString = '\t'
local savedTables = {}
-- setup a lua keyword map
local keyWords = {
"and", "break", "do", "else", "elseif", "end", "false", "for", "function",
"if", "in", "local", "nil", "not", "or", "repeat", "return", "then", "true",
"until", "while"
}
local keyWordSet = {}
for _,w in ipairs(keyWords) do
keyWordSet[w] = true
end
keyWords = nil -- don't need the array anymore
--------------------------------------------------------------------------------
local function encloseStr(s)
return string.format('%q', s)
end
local function encloseKey(s)
local wrap = not (string.find(s, '^%a[_%a%d]*$'))
if (not wrap) then
if (string.len(s) <= 0) then wrap = true end
end
if (not wrap) then
if (keyWordSet[s]) then wrap = true end
end
if (wrap) then
return string.format('[%q]', s)
else
return s
end
end
local keyTypes = {
['string'] = true,
['number'] = true,
['boolean'] = true,
}
local valueTypes = {
['string'] = true,
['number'] = true,
['boolean'] = true,
['table'] = true,
}
local function CompareKeys(kv1, kv2)
local k1, v1 = kv1[1], kv1[2]
local k2, v2 = kv2[1], kv2[2]
local ktype1 = type(k1)
local ktype2 = type(k2)
if (ktype1 ~= ktype2) then
return (ktype1 > ktype2)
end
local vtype1 = type(v1)
local vtype2 = type(v2)
if ((vtype1 == 'table') and (vtype2 ~= 'table')) then
return false
end
if ((vtype1 ~= 'table') and (vtype2 == 'table')) then
return true
end
return (k1 < k2)
end
local function MakeSortedTable(t)
local st = {}
for k,v in pairs(t) do
if (keyTypes[type(k)] and valueTypes[type(v)]) then
table.insert(st, { k, v })
end
end
table.sort(st, CompareKeys)
return st
end
local function SaveTable(t, file, indent)
local indent = indent .. indentString
local st = MakeSortedTable(t)
for _,kv in ipairs(st) do
local k, v = kv[1], kv[2]
local ktype = type(k)
local vtype = type(v)
-- output the key
if (ktype == 'string') then
file:write(indent..encloseKey(k)..' = ')
else
file:write(indent..'['..tostring(k)..'] = ')
end
-- output the value
if (vtype == 'string') then
file:write(encloseStr(v)..',\n')
elseif (vtype == 'number') then
if (v == math.huge) then
file:write('math.huge,\n')
elseif (v == -math.huge) then
file:write('-math.huge,\n')
else
file:write(tostring(v)..',\n')
end
elseif (vtype == 'boolean') then
file:write(tostring(v)..',\n')
elseif (vtype == 'table') then
if (savedTables[v]) then
error("table.save() does not support recursive tables")
end
if (next(v)) then
savedTables[t] = true
file:write('{\n')
SaveTable(v, file, indent)
file:write(indent..'},\n')
savedTables[t] = nil
else
file:write('{},\n') -- empty table
end
end
end
end
function table.save(t, filename, header)
local file = io.open(filename, 'w')
if (file == nil) then
return
end
if (header) then
file:write(header..'\n')
end
file:write('return {\n')
if (type(t)=="table")or(type(t)=="metatable") then SaveTable(t, file, '') end
file:write('}\n')
file:close()
for k,v in pairs(savedTables) do
savedTables[k] = nil
end
end
|
