--[[ LuCI - Template Parser Description: A template parser supporting includes, translations, Lua code blocks and more. It can be used either as a compiler or as an interpreter. FileId: $Id$ License: Copyright 2008 Steven Barth <steven@midlink.org> Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ]]-- local util = require "luci.util" local config = require "luci.config" local tparser = require "luci.template.parser" local tostring, pairs, loadstring = tostring, pairs, loadstring local setmetatable, loadfile = setmetatable, loadfile local getfenv, setfenv, rawget = getfenv, setfenv, rawget local assert, type, error = assert, type, error --- LuCI template library. module "luci.template" config.template = config.template or {} viewdir = config.template.viewdir or util.libpath() .. "/view" -- Define the namespace for template modules context = util.threadlocal() --- Render a certain template. -- @param name Template name -- @param scope Scope to assign to template (optional) function render(name, scope) return Template(name):render(scope or getfenv(2)) end -- Template class Template = util.class() -- Shared template cache to store templates in to avoid unnecessary reloading Template.cache = setmetatable({}, {__mode = "v"}) -- Constructor - Reads and compiles the template on-demand function Template.__init__(self, name) self.template = self.cache[name] self.name = name -- Create a new namespace for this template self.viewns = context.viewns -- If we have a cached template, skip compiling and loading if not self.template then -- Compile template local err local sourcefile = viewdir .. "/" .. name .. ".htm" self.template, _, err = tparser.parse(sourcefile) -- If we have no valid template throw error, otherwise cache the template if not self.template then error(err) else self.cache[name] = self.template end end end -- Renders a template function Template.render(self, scope) scope = scope or getfenv(2) -- Put our predefined objects in the scope of the template setfenv(self.template, setmetatable({}, {__index = function(tbl, key) return rawget(tbl, key) or self.viewns[key] or scope[key] end})) -- Now finally render the thing local stat, err = util.copcall(self.template) if not stat then error("Error in template %s: %s" % {self.name, err}) end end