[转]xml中嵌入lua

http://www.cppblog.com/lai3d/archive/2007/06/23/26849.html

学xml   http://www.w3schools.com/xml/default.asp
我们游戏里界面和与界面有关的很多逻辑都是写在xml里面的，其中逻辑使用lua写，嵌在xml中，用xmlSpy编辑。
xml中嵌入lua，比如

<script>
function max(a,b)
    if a &gt; b then
        return a;
    else
        return b;
    end
end
</script>

大于号   > 要写成 &gt;  , 就是greater than的意思。同样：
小于号   <                &lt;            less than
这样子lua没有高亮显示，搞得我看起来很痛苦，晚上突发奇想，从*.lua文件里读，就可以用LuaEdit来编辑了，那我就可以按F6来check syntax了，哈哈

<script luafile="1" path="gui\haha.lua">
</script>

luafile 为 1，就读path里的，为0就读script节点的text,哈哈，爽！
我从xml文件中把lua段粘贴到*.lua文件里时，忘了把&gt;之类的符号换成 > 等，导致我查了很久，老子还跟踪到luabind和lua的源代码里面去，靠！faint!
幸亏LuaEdit有Check Syntax功能，帮助我检查到了错误，深刻体会到了工具的好处，也更加坚信“人与动物的最大差别在于人类能够制造工具并使用工具”！
要是再整得能单步调试，那就爽歪歪了！

---

All text in an XML document will be parsed by the parser.

Only text inside a CDATA section will be ignored by the parser.

---

Parsed Data

XML parsers normally parse all the text in an XML document.

When an XML element is parsed, the text between the XML tags is also parsed:

<message>This text is also parsed</message>

The parser does this because XML elements can contain other elements, as in this example, where the <name> element contains two other elements (first and last):

<name><first>Bill</first><last>Gates</last></name>

and the parser will break it up into sub-elements like this:

<name>
            <first>Bill</first>
            <last>Gates</last>
            </name>

---

Escape Characters

Illegal XML characters have to be replaced by entity references.

If you place a character like "<" inside an XML element, it will generate an error because the parser interprets it as the start of a new element. You cannot write something like this:

<message>if salary < 1000 then</message>

To avoid this, you have to replace the "<" character with an entity reference, like this:

<message>if salary &lt; 1000 then</message>

There are 5 predefined entity references in XML:

&lt;
<
less than

&gt;
>
greater than

&amp;
&
ampersand

&apos;
'
apostrophe

&quot;
"
quotation mark

Note: Only the characters "<" and "&" are strictly illegal in XML. Apostrophes, quotation marks and greater than signs are legal, but it is a good habit to replace them.

---

CDATA

Everything inside a CDATA section is ignored by the parser.

If your text contains a lot of "<" or "&" characters - as program code often does - the XML element can be defined as a CDATA section.

A CDATA section starts with "<![CDATA[" and ends with "]]>":

<script>
            <![CDATA[
            function matchwo(a,b)
            {
            if (a < b && a < 0) then
            {
            return 1
            }
            else
            {
            return 0
            }
            }
            ]]>
            </script>

In the example above, everything inside the CDATA section is ignored by the parser.

Notes on CDATA sections:

A CDATA section cannot contain the string "]]>", therefore, nested CDATA sections are not allowed.

Also make sure there are no spaces or line breaks inside the "]]>" string.