https://github.com/DoubleSpout/lua-resty-aries

openresty and lua multi-function template
https://github.com/DoubleSpout/lua-resty-aries

html lua luajit openresty resty template template-engine templates tpl

Last synced: 3 months ago
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openresty and lua multi-function template

• Host: GitHub
• URL: https://github.com/DoubleSpout/lua-resty-aries
• Owner: DoubleSpout
• License: mit
• Created: 2017-03-17T04:26:24.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2017-04-12T06:42:13.000Z (over 7 years ago)
• Last Synced: 2024-04-12T04:04:13.665Z (7 months ago)
• Topics: html, lua, luajit, openresty, resty, template, template-engine, templates, tpl
• Language: Lua
• Size: 51.8 KB
• Stars: 47
• Watchers: 4
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: LICENSE

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README

        

# lua-resty-aries 

**openresty and lua multi-function template, it can correct show your error line.**

[![Licence](http://img.shields.io/badge/Licence-MIT-brightgreen.svg)](LICENSE)

[![Build Status](https://travis-ci.org/DoubleSpout/lua-resty-aries.svg?branch=master)](https://travis-ci.org/DoubleSpout/lua-resty-aries)

[![Coverage Status](https://coveralls.io/repos/github/DoubleSpout/lua-resty-aries/badge.svg)](https://coveralls.io/github/DoubleSpout/lua-resty-aries)

You can use `lua-resty-aries` to render template and safety run lua code string.The template or code string can be from any kind of data source, such as: file, redis, mysql or mongodb, any you like. And `lua-resty-aries` can correct postion your template's error line.

**support openresty1.0.6+, lua5.1+**

lua-resty-aries support linux/ubantu, windows and mac.

you need install lua/luajit first [http://www.lua.org/](http://www.lua.org/ "Lua")

## Install

with luarocks

	luarocks install lua-resty-aries

## Get Started

	local Aries = require("resty.aries")

    local aries1 = Aries:new()

    local result, err = aries1:compile([=[ 

			<% hello = "welcome to lua-resty-aries" %>

			
<%= hello %>

	 ]=])


    print(result)	-- 
<%= hello %>

	   

## Using file template


We create` index.html` file at `{workdir}/tpl/index.html`

	

	

	

		<%= ctx.title %>

	

	

		<% hello = "welcome to lua-resty-aries" %>

		
<%= hello %>

	

	


We can render the template like this:

	local Aries = require("resty.aries")

    local aries1 = Aries:new()

    local result, err = aries1:render("index", {

		title="lua-resty-aries title"

	})

    print(result)

## A littel complex example

We create tpl/index2.html like this

	

	

	

		<%= ctx.title %>

	

	

		<% hello = "welcome to lua-resty-aries" %>

		
<%= hello %>

		<% if (ctx.loop or 0) > 0 then %>

			<% for i=1,ctx.loop,1 do %>

				<% include inc/loop %>

			<% end %>

		<% else %>

			<% include inc/noloop %>

		<% end %>

	

	


create inc/noloop.html

	
ctx noloop

	this must be occur an error, undefined function <% ctx.error() %>

	ctx.loop=<%= ctx.loop %>


create inc/loop.html

	
ctx doloop

	ctx.loop=<%= ctx.loop %>


create render code:

	local Aries = require("resty.aries")

    local aries1 = Aries:new()

    local result, err = aries1:render("index2", {

		title="lua-resty-aries title",

        loop=10,	--change loop to control loop times

	})

    print(result)

if we change render code like this, this must be occur an error:

	local Aries = require("resty.aries")

    local aries1 = Aries:new()

    local result, err = aries1:render("index2", {

		title="lua-resty-aries title",

        loop=-1,	--not loop make an errror

	})

    print(err)	-- index2.html: 14 >> inc/noloop.html: 2 have error  attempt to call field 'error' (a nil value)

we can get error msg, correct to postion the error line, even it at include template:

	index2.html: 14 >> inc/noloop.html: 2 have error  attempt to call field 'error' (a nil value)

## Aries Constructor and Instance

   

`Aries` Constructor method. Every time, you call `Aries:new(opt)` will return a new `Aries instance`.

	local Aries = require("resty.aries")

	local ariesInstance = Aries:new(opt)

`opt` all attribute, all of these attributes are `option`:

	-- below is the default value

	opt = {

		-- custom left half tag

		startTag = "<%",

		-- custom right half tag

		endTag = "%>",

		-- custom the template file's suffix 

		fileSuffix = "html",

		-- change root of template folder path

		rootPath = "./tpl",

		-- works fine at linux and windows

		sep = "/",

		-- if occur error, show the error line and msg, this must set off in production to increase performance

		isShowDetailError = true,  

		-- tpl parse cache,default is true, 

		cache = true,

		-- tpl parse cache time, default expire 30min, unit second

		cacheTime = 1800,

		-- template render timeout, unit second

		-- default not timeout

		timeout = -1,

		-- instance level object to put to template

		ctx = {},

		-- change template data source, you can get template from redis or other data source.

		-- default is from file system

		getInclude = function(self, includeName)

						-- simple example get template from redis

						-- local data, err = redis_conn:get(includeName)

						-- return data == ngx.null and "" or data

						return self.readfile(string.format("%s%s%s.%s", self.rootPath, self.sep, includeName, self.fileSuffix))

					end,

		-- before return string ,you can minify the html or xml string

		-- default do nothing

		minify = function(self, renderStr)

						return renderStr

				end,

	}

`Aries Instance` Method

	-- get all the include template name by name

	local includeNameTable, err = ariesInstance:getIncludesByName(tplName string)

	-- get all the include template name by string code

	local includeNameTable, err = ariesInstance:getIncludesByContent(tplName string)

	-- render a template by name

	-- here ctx inherit the ariesInstance.ctx

	local renderStr, err = ariesInstance:render(tplName string, [ctx table])

	-- render a template by string code

	-- here ctx inherit the ariesInstance.ctx

	local renderStr, err = ariesInstance:compile(tplName string, [ctx table, tplName string])

	

## Template API (using at template)

	

We can use `include {templateName}` to include other template, `lua-resty-aries` will call `ariesInstance:getInclude({templateName})` everytime.(include first we call `ariesInstance:render({templateName})`). example:

	<% include inc/header %>	-- notice,default not to add file suffix

print on template example:

	

	-- will show hello world < > " '

	<%= string.format("hello world %s %s %s %s", "<", ">", '"', "'") %>

	

	-- will show hello world < > " '

	<%= string.format("hello world %s %s %s %s", "<", ">", '"', "'") %>

`ctx` table on template:

	-- like <%= {str} %>

	ctx.print(str string)

 	-- like <%- {str} %> 

	ctx.rawPrint(str string)

	-- lock some ctx attribute, before excute ctx.unlock({field}), you can't change such {field} value

	-- example:

	-- ctx.a = 1

	-- ctx.lock(a)

	-- ctx.a = 2 -- occur error

	ctx.lock({field})

	-- unlock field

	-- example

	-- ctx.a = 1

	-- ctx.lock(a)

	-- ctx.unlock(a)

	-- ctx.a = 2 -- ok

	ctx.unlock({field})