0e50aa690a
- template parser: merge lmo library - template parser: rewrite to operate on memory mapped files - template parser: implement proper line number reporting on syntax errors - template parser: process translate tags directly and bypass Lua - template lmo: introduce load_catalog(), change_catalog() and close_catalog() - template lmo: rewrite index processing to operate directly on the memory mapped file - template lmo: implement binary search keys, reducing the lookup complexity to O(log n) - po2lmo: write sorted indixes when generating *.lmo archives - i18n: use the template parser for translations - i18n: stub load(), loadc() and clear() - i18n: map setlanguage() to load_catalog()
107 lines
3 KiB
Lua
107 lines
3 KiB
Lua
--[[
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LuCI - Template Parser
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Description:
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A template parser supporting includes, translations, Lua code blocks
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and more. It can be used either as a compiler or as an interpreter.
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FileId: $Id$
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License:
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Copyright 2008 Steven Barth <steven@midlink.org>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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]]--
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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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-- 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)
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self.template = self.cache[name]
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self.name = name
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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 = viewdir .. "/" .. name .. ".htm"
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self.template, _, err = tparser.parse(sourcefile)
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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 '" .. 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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else
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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 occured: " .. tostring(err or "(nil)"))
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end
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end
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