Viewing github.com/alecthomas/chroma/lexers/embedded/glsl.xml

```
<lexer>
```
```
  <config>
```
```
    <name>GLSL</name>
```
```
    <alias>glsl</alias>
```
```
    <filename>*.vert</filename>
```
```
    <filename>*.frag</filename>
```
```
    <filename>*.geo</filename>
```

    <mime_type>text/x-glslsrc</mime_type>

```
  </config>
```
```
  <rules>
```
```
    <state name="root">
```
```
      <rule pattern="^#.*">
```
```
        <token type="CommentPreproc"/>
```
```
      </rule>
```
```
      <rule pattern="//.*">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```

      <rule pattern="/(\\\n)?[*](.|\n)*?[*](\\\n)?/">

        <token type="CommentMultiline"/>

```
      </rule>
```

      <rule pattern="\+|-|~|!=?|\*|/|%|&lt;&lt;|&gt;&gt;|&lt;=?|&gt;=?|==?|&amp;&amp;?|\^|\|\|?">

```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="[?:]">
```
```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="\bdefined\b">
```
```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="[;{}(),\[\]]">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```

      <rule pattern="[+-]?\d*\.\d+([eE][-+]?\d+)?">

        <token type="LiteralNumberFloat"/>

```
      </rule>
```

      <rule pattern="[+-]?\d+\.\d*([eE][-+]?\d+)?">

        <token type="LiteralNumberFloat"/>

```
      </rule>
```

      <rule pattern="0[xX][0-9a-fA-F]*">

        <token type="LiteralNumberHex"/>

```
      </rule>
```
```
      <rule pattern="0[0-7]*">
```

        <token type="LiteralNumberOct"/>

```
      </rule>
```
```
      <rule pattern="[1-9][0-9]*">
```

        <token type="LiteralNumberInteger"/>

```
      </rule>
```

      <rule pattern="\b(sampler3DsamplerCube|sampler2DShadow|sampler1DShadow|invariant|sampler1D|sampler2D|attribute|mat3mat4|centroid|continue|varying|uniform|discard|mat4x4|mat3x3|mat2x3|mat4x2|mat3x2|mat2x2|mat2x4|mat3x4|struct|return|mat4x3|bvec4|false|ivec4|ivec3|const|float|inout|ivec2|break|while|bvec3|bvec2|vec3|else|true|void|bool|vec2|vec4|mat2|for|out|int|in|do|if)\b">

```
        <token type="Keyword"/>
```
```
      </rule>
```

      <rule pattern="\b(sampler2DRectShadow|sampler2DRect|sampler3DRect|namespace|precision|interface|volatile|template|unsigned|external|noinline|mediump|typedef|default|switch|static|extern|inline|sizeof|output|packed|double|public|fvec3|class|union|short|highp|fixed|input|fvec4|hvec2|hvec3|hvec4|dvec2|dvec3|dvec4|fvec2|using|long|this|enum|lowp|cast|goto|half|asm)\b">

```
        <token type="Keyword"/>
```
```
      </rule>
```
```
      <rule pattern="[a-zA-Z_]\w*">
```
```
        <token type="Name"/>
```
```
      </rule>
```
```
      <rule pattern="\.">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```