XML/HTML support

[gitgrimbo]

When trying to highlight an XML file, the hljs HTML tags are output. Is this expected behaviour? Using the --language XML option does not change the output.

Command:

>highlight pom.xml

Result:

<span class="hljs-tag"><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"></span>
        <span class="hljs-tag"><modelVersion></span>4.0.0<span class="hljs-tag"></modelVersion></span>
        <span class="hljs-tag"><parent></span>
                <span class="hljs-tag"><groupId></span>org.springframework.boot<span class="hljs-tag"></groupId></span>
                <span class="hljs-tag"><artifactId></span>spring-boot-starter-parent<span class="hljs-tag"></artifactId></span>
                <span class="hljs-tag"><version></span>1.5.2.RELEASE<span class="hljs-tag"></version></span>
        <span class="hljs-tag"></parent></span>

[felixfbecker]

I currently parse the HTML with a regexp, that only works for languages like SQL and JSON. XML and HTML have nested tags. See #1

It's not hard to do, there are countless HTML parsers on npm, I was just too lazy to implement it because I only needed SQL. Feel free to do a PR :)

[acarl005]

Check out my PR #5. It's not the best for performance, but it seems to work for me!