将 HTML 代码块添加到 Lua 中的字符串 (concat) [英] Adding an HTML block of code to a string (concat) in Lua

问题描述

我知道我可以像这样在 Lua 中连接字符串

String = String .. 'more'

但是如果我想添加 HTML 并且想保持(显然)它的外观怎么办?例如，我如何克服

luac: Perl to Lua:226: ''' 附近未完成的字符串

执行此操作时出现错误

Html_string = Html_string .."<tr>" . gettext("Last Upgrade") . "<td title=\"Upgrade_date\"Upgrade_status</td></tr>"

解决方案

您可以使用多行字符串标记.

在 Lua 中，这使用 [[ .. ]] 语法

例如:

<前>Html_string = Html_string .. [[<tr><th class="row">]] .. gettext("Last Upgrade") .. [[</th><td title="Upgrade_date">Upgrade_status</td></tr>]]

在 [[..]] 内部，您甚至不必转义任何字符.如果您的 html 内容恰好包含 [[ ..]] 本身，您可以将其扩展为 [=[ .. ]=] 以避免冲突.这种扩展可以对任意数量的 = 符号进行，只要它在开始和结束标记中的数量相同即可.

参考 PiL，它甚至使用 HTML 作为多行字符串的示例.

http://www.lua.org/pil/2.4.html

I know that I can concatenate strings in Lua like so

String = String .. 'more'

But what if I want to add HTML and want to keep (obviously) the way it looks? For example, how do I overcome the

luac: Perl to Lua:226: unfinished string near '''

error I get when I do this

Html_string = Html_string .. "
                <tr>                                                                                         
                    <th class=row>" . gettext("Last Upgrade") . "</th>                                   
                    <td title=\"Upgrade_date\"Upgrade_status</td>                                     
                </tr>
                             "

解决方案

You can use multi-line string tokens.

In Lua, thats done using the [[ .. ]] syntax

So, for example:

  Html_string = Html_string .. [[
                <tr>                                                                                         
                    <th class="row">]] .. gettext("Last Upgrade") .. [[</th>                                   
                    <td title="Upgrade_date">Upgrade_status</td>                                     
                </tr>
  ]]

Inside of [[..]] you don't even have to escape any characters. If your html content happens to contain [[ ..]] itself, you can expand it to [=[ .. ]=] to avoid conflicts. This expansion can be done to any number of = signs, as long as its the same amount in the opening and closing tag.

See the PiL for reference, it even uses HTML as an example for the multiline strings.

http://www.lua.org/pil/2.4.html

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