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-- Copyright 2008 Steven Barth <steven@midlink.org>
-- Licensed to the public under the Apache License 2.0.
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
--- Render a template from a string.
-- @param template Template string
-- @param scope Scope to assign to template (optional)
function render_string(template, scope)
return Template(nil, template):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, template)
if name then
self.template = self.cache[name]
self.name = name
else
self.name = "[string]"
end
-- 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
if name then
sourcefile = viewdir .. "/" .. name .. ".htm"
self.template, _, err = tparser.parse(sourcefile)
else
sourcefile = "[string]"
self.template, _, err = tparser.parse_string(template)
end
-- If we have no valid template throw error, otherwise cache the template
if not self.template then
error("Failed to load template '" .. self.name .. "'.\n" ..
"Error while parsing template '" .. sourcefile .. "':\n" ..
(err or "Unknown syntax error"))
elseif name then
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("Failed to execute template '" .. self.name .. "'.\n" ..
"A runtime error occurred: " .. tostring(err or "(nil)"))
end
end
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