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101 lines
2.8 KiB
Lua
101 lines
2.8 KiB
Lua
1 year ago
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-- Copyright 2008 Steven Barth <steven@midlink.org>
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-- Licensed to the public under the Apache License 2.0.
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local util = require "luci.util"
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local config = require "luci.config"
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local tparser = require "luci.template.parser"
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local tostring, pairs, loadstring = tostring, pairs, loadstring
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local setmetatable, loadfile = setmetatable, loadfile
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local getfenv, setfenv, rawget = getfenv, setfenv, rawget
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local assert, type, error = assert, type, error
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--- LuCI template library.
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module "luci.template"
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config.template = config.template or {}
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viewdir = config.template.viewdir or util.libpath() .. "/view"
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-- Define the namespace for template modules
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context = util.threadlocal()
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--- Render a certain template.
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-- @param name Template name
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-- @param scope Scope to assign to template (optional)
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function render(name, scope)
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return Template(name):render(scope or getfenv(2))
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end
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--- Render a template from a string.
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-- @param template Template string
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-- @param scope Scope to assign to template (optional)
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function render_string(template, scope)
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return Template(nil, template):render(scope or getfenv(2))
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end
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-- Template class
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Template = util.class()
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-- Shared template cache to store templates in to avoid unnecessary reloading
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Template.cache = setmetatable({}, {__mode = "v"})
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-- Constructor - Reads and compiles the template on-demand
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function Template.__init__(self, name, template)
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if name then
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self.template = self.cache[name]
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self.name = name
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else
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self.name = "[string]"
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end
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-- Create a new namespace for this template
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self.viewns = context.viewns
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-- If we have a cached template, skip compiling and loading
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if not self.template then
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-- Compile template
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local err
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local sourcefile
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if name then
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sourcefile = viewdir .. "/" .. name .. ".htm"
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self.template, _, err = tparser.parse(sourcefile)
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else
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sourcefile = "[string]"
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self.template, _, err = tparser.parse_string(template)
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end
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-- If we have no valid template throw error, otherwise cache the template
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if not self.template then
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error("Failed to load template '" .. self.name .. "'.\n" ..
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"Error while parsing template '" .. sourcefile .. "':\n" ..
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(err or "Unknown syntax error"))
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elseif name then
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self.cache[name] = self.template
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end
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end
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end
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-- Renders a template
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function Template.render(self, scope)
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scope = scope or getfenv(2)
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-- Put our predefined objects in the scope of the template
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setfenv(self.template, setmetatable({}, {__index =
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function(tbl, key)
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return rawget(tbl, key) or self.viewns[key] or scope[key]
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end}))
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-- Now finally render the thing
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local stat, err = util.copcall(self.template)
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if not stat then
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error("Failed to execute template '" .. self.name .. "'.\n" ..
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"A runtime error occurred: " .. tostring(err or "(nil)"))
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end
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end
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