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

```
<lexer>
```
```
  <config>
```
```
    <name>Protocol Buffer</name>
```
```
    <alias>protobuf</alias>
```
```
    <alias>proto</alias>
```
```
    <filename>*.proto</filename>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="package">
```
```
      <rule pattern="[a-zA-Z_]\w*">
```
```
        <token type="NameNamespace"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="message">
```
```
      <rule pattern="[a-zA-Z_]\w*">
```
```
        <token type="NameClass"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="type">
```
```
      <rule pattern="[a-zA-Z_]\w*">
```
```
        <token type="Name"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="root">
```
```
      <rule pattern="[ \t]+">
```
```
        <token type="Text"/>
```
```
      </rule>
```

      <rule pattern="[,;{}\[\]()&lt;&gt;]">

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

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

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

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

        <token type="CommentMultiline"/>

```
      </rule>
```

      <rule pattern="\b(extensions|required|repeated|optional|returns|default|option|packed|import|ctype|oneof|max|rpc|to)\b">

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

      <rule pattern="(sfixed32|sfixed64|fixed32|fixed64|sint32|sint64|double|string|uint32|uint64|int32|float|int64|bytes|bool)\b">

```
        <token type="KeywordType"/>
```
```
      </rule>
```
```
      <rule pattern="(true|false)\b">
```

        <token type="KeywordConstant"/>

```
      </rule>
```
```
      <rule pattern="(package)(\s+)">
```
```
        <bygroups>
```

          <token type="KeywordNamespace"/>

```
          <token type="Text"/>
```
```
        </bygroups>
```
```
        <push state="package"/>
```
```
      </rule>
```

      <rule pattern="(message|extend)(\s+)">

```
        <bygroups>
```

          <token type="KeywordDeclaration"/>

```
          <token type="Text"/>
```
```
        </bygroups>
```
```
        <push state="message"/>
```
```
      </rule>
```

      <rule pattern="(enum|group|service)(\s+)">

```
        <bygroups>
```

          <token type="KeywordDeclaration"/>

```
          <token type="Text"/>
```
```
        </bygroups>
```
```
        <push state="type"/>
```
```
      </rule>
```
```
      <rule pattern="\&#34;.*?\&#34;">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
      <rule pattern="\&#39;.*?\&#39;">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```

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

        <token type="LiteralNumberFloat"/>

```
      </rule>
```

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

        <token type="LiteralNumberFloat"/>

```
      </rule>
```

      <rule pattern="(\-?(inf|nan))\b">

        <token type="LiteralNumberFloat"/>

```
      </rule>
```

      <rule pattern="0x[0-9a-fA-F]+[LlUu]*">

        <token type="LiteralNumberHex"/>

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

        <token type="LiteralNumberOct"/>

```
      </rule>
```
```
      <rule pattern="\d+[LlUu]*">
```

        <token type="LiteralNumberInteger"/>

```
      </rule>
```
```
      <rule pattern="[+-=]">
```
```
        <token type="Operator"/>
```
```
      </rule>
```

      <rule pattern="([a-zA-Z_][\w.]*)([ \t]*)(=)">

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

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