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--[[
Copyright (c) 2012-2019 Kaarle Ritvanen
See LICENSE file for license details
--]]
local topology = require('aconf.model.root').topology
local class = require('aconf.object').class
local pth = require('aconf.path')
local tostr = require('aconf.persistence.util').tostring
local util = require('aconf.util')
local contains = util.contains
local copy = util.copy
local stringy = require('stringy')
local function array_join(tbl, value)
local res = copy(tbl)
table.insert(res, value)
return res
end
local function array_without_last(tbl)
local res = copy(tbl)
res[#res] = nil
return res
end
local function basename(path)
local res, pred = path:match('^.*/([@#$%w._-]+)([^/]*)$')
assert(res)
assert(res ~= '#')
assert(pred == '' or pred:match('^%[.+%]$'))
return res
end
local function append_pred(path, pred) return path..'['..pred..']' end
local function append_key_pred(path, key, value)
return append_pred(path, key.." = '"..value.."'")
end
local function key(mode)
if mode == 'value' then return '.' end
if mode and stringy.startswith(mode, 'child-value:') then
return mode:sub(13, -1)
end
end
local function is_selector(mode) return mode and mode ~= 'parent-value' end
local function aug_top(path)
path = copy(path)
table.insert(path, 1, 'augeas')
return topology(path)
end
local function conv_path(path)
local res = '/files'
if #path == 0 then return res, nil, {} end
path = copy(path)
local top = aug_top{}
local mode, parent
local keys = {}
repeat
local comp = path[1]
assert(tostring(comp):match('^[%w %_%-%.%@%#%$]+$'))
if mode then
if mode == 'enumerate' then
assert(type(comp) == 'number')
res = append_pred(res, comp)
else
local k = key(mode)
assert(k and type(comp) == 'string')
res = append_key_pred(res, k, comp)
table.insert(keys, k)
end
parent = nil
else
parent = res
res = res..'/'..comp
keys = {}
end
top = top and top(pth.escape(comp))
mode = top and top.mode
table.remove(path, 1)
until #path == 0
if mode == 'parent-value' then
assert(parent)
res = parent
end
return res, mode, keys
end
local backend = class()
function backend:init() self.aug = require('augeas').init() end
function backend:get(path, top)
local apath, mode, keys = conv_path(path)
local existence = top == true
if existence or not top then top = aug_top(path) end
local tpe = top and top.type
local tbl = tpe == 'table'
if tbl and top.subtype == 'model' then mode = nil end
local leaf = not tbl and not mode
if mode == 'parent-value' then
assert(not tbl)
leaf = true
end
local matches = self.aug:match(apath..(not leaf and not mode and '/*' or ''))
if #matches == 0 and not is_selector(mode) then return end
if is_selector(mode) and #path > 1 and not self:get(
array_without_last(path), true
) then
return
end
if not tpe and not mode then
if #matches > 1 then
leaf = false
mode = 'enumerate'
else
local children = self.aug:match(apath..'/*')
if #children > 0 then
leaf = false
matches = children
end
end
end
if leaf then
assert(#matches == 1)
return self.aug:get(apath)
end
if existence then return true end
local names = {}
for i, child in ipairs(matches) do
local name
if not mode then
name = basename(child)
name = tonumber(name) or name
if contains(keys, name) then name = nil end
elseif mode == 'enumerate' then name = i
else
local k = key(mode)
assert(k)
name = self.aug:get(child..(k == '.' and '' or '/'..k))
end
if name and self:get(array_join(path, name), true) then
names[name] = true
end
end
return util.keys(names)
end
function backend:set(mods)
local gc = {}
for _, mod in ipairs(mods) do
local path, value = table.unpack(mod)
local function insert(path, new)
local apath, mode, keys = conv_path(path)
if #path == 0 then return apath, keys end
local name = path[#path]
local parent = array_without_last(path)
local ppath, pmode = conv_path(parent)
if is_selector(pmode) then
gc[pth.join('/', table.unpack(parent))] = false
if pmode == 'enumerate' then
local count = #self.aug:match(ppath)
while count < name do
insert(parent, true)
count = count + 1
end
return apath, keys
end
end
local matches = self.aug:match(apath)
local count = #matches
if count > 0 and not new then return apath, keys end
if key(pmode) then
apath = key(pmode) and append_pred(
ppath, 'count('..key(pmode)..') = 0'
) or append_key_pred(ppath, '.', '')
matches = self.aug:match(apath)
assert(#matches < 2)
apath = matches[1] or insert(parent, true)
self.aug:set(apath..'/'..key(pmode), name)
return apath, keys
end
if #matches == 0 then
matches = self.aug:match(ppath..'/*')
local function order(path)
local top = aug_top(path)
return top and top.order
end
local ord = order(path)
for _, sibling in ipairs(matches) do
local sname = basename(sibling)
local sord = order(array_join(parent, sname))
if sord then
local snum = tonumber(sname)
if sord > ord or (
sord == ord and snum and type(name) == 'number' and snum > name
) then
self.aug:insert(sibling, name, true)
return apath, keys
end
end
end
end
if #matches == 0 then
if new then self.aug:set(apath, nil) end
return apath, keys
end
self.aug:insert(matches[#matches], name)
return append_pred(apath, count + 1), keys
end
local apath, keys = insert(path)
local is_table = type(value) == 'table'
if not (is_table or contains(keys, '.')) then
self.aug:set(apath, value ~= nil and tostr(value) or nil)
end
util.setdefault(gc, pth.join('/', table.unpack(path)), true)
end
for path, _ in pairs(gc) do
local p = pth.split(path)
while #p > 0 do
local value = self:get(p)
if (
type(value) == 'string' and value ~= ''
) or (
type(value) == 'table' and #value > 0
) then
break
end
if gc[pth.join('/', table.unpack(p))] ~= false then
self.aug:rm(conv_path(p))
end
p[#p] = nil
end
end
if self.aug:save() ~= 0 then
print('Augeas save failed')
for _, ep in ipairs(self.aug:match('/augeas//error')) do
print(ep, self.aug:get(ep))
end
assert(false)
end
end
return backend
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