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

```
<lexer>
```
```
  <config>
```
```
    <name>Chapel</name>
```
```
    <alias>chapel</alias>
```
```
    <alias>chpl</alias>
```
```
    <filename>*.chpl</filename>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="procname">
```

      <rule pattern="([a-zA-Z_][.\w$]*|\~[a-zA-Z_][.\w$]*|[+*/!~%&lt;&gt;=&amp;^|\-:]{1,2})">

```
        <token type="NameFunction"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="\(">
```
```
        <token type="Punctuation"/>
```
```
        <push state="receivertype"/>
```
```
      </rule>
```
```
      <rule pattern="\)+\.">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="receivertype">
```

      <rule pattern="(unmanaged|borrowed|atomic|single|shared|owned|sync)\b">

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

      <rule pattern="(complex|nothing|opaque|string|locale|bytes|range|imag|real|bool|uint|void|int)\b">

```
        <token type="KeywordType"/>
```
```
      </rule>
```
```
      <rule pattern="[^()]*">
```
```
        <token type="NameOther"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="root">
```
```
      <rule pattern="\n">
```
```
        <token type="TextWhitespace"/>
```
```
      </rule>
```
```
      <rule pattern="\s+">
```
```
        <token type="TextWhitespace"/>
```
```
      </rule>
```
```
      <rule pattern="\\\n">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="//(.*?)\n">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```

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

        <token type="CommentMultiline"/>

```
      </rule>
```

      <rule pattern="(config|const|inout|param|type|out|ref|var|in)\b">

        <token type="KeywordDeclaration"/>

```
      </rule>
```

      <rule pattern="(false|none|true|nil)\b">

        <token type="KeywordConstant"/>

```
      </rule>
```

      <rule pattern="(complex|nothing|opaque|string|locale|bytes|range|imag|real|bool|uint|void|int)\b">

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

      <rule pattern="(implements|forwarding|prototype|otherwise|subdomain|primitive|unmanaged|override|borrowed|lifetime|coforall|continue|private|require|dmapped|cobegin|foreach|lambda|sparse|shared|domain|pragma|reduce|except|export|extern|throws|forall|delete|return|noinit|single|import|select|public|inline|serial|atomic|defer|break|local|index|throw|catch|label|begin|where|while|align|yield|owned|only|this|sync|with|scan|else|enum|init|when|then|let|for|try|use|new|zip|if|by|as|on|do)\b">

```
        <token type="Keyword"/>
```
```
      </rule>
```
```
      <rule pattern="(iter)(\s+)">
```
```
        <bygroups>
```
```
          <token type="Keyword"/>
```

          <token type="TextWhitespace"/>

```
        </bygroups>
```
```
        <push state="procname"/>
```
```
      </rule>
```
```
      <rule pattern="(proc)(\s+)">
```
```
        <bygroups>
```
```
          <token type="Keyword"/>
```

          <token type="TextWhitespace"/>

```
        </bygroups>
```
```
        <push state="procname"/>
```
```
      </rule>
```
```
      <rule pattern="(operator)(\s+)">
```
```
        <bygroups>
```
```
          <token type="Keyword"/>
```

          <token type="TextWhitespace"/>

```
        </bygroups>
```
```
        <push state="procname"/>
```
```
      </rule>
```

      <rule pattern="(class|interface|module|record|union)(\s+)">

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

          <token type="TextWhitespace"/>

```
        </bygroups>
```
```
        <push state="classname"/>
```
```
      </rule>
```
```
      <rule pattern="\d+i">
```
```
        <token type="LiteralNumber"/>
```
```
      </rule>
```

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

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

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

```
        <token type="LiteralNumber"/>
```
```
      </rule>
```
```
      <rule pattern="\d+[Ee][-+]\d+i">
```
```
        <token type="LiteralNumber"/>
```
```
      </rule>
```

      <rule pattern="(\d*\.\d+)([eE][+-]?[0-9]+)?i?">

        <token type="LiteralNumberFloat"/>

```
      </rule>
```

      <rule pattern="\d+[eE][+-]?[0-9]+i?">

        <token type="LiteralNumberFloat"/>

```
      </rule>
```
```
      <rule pattern="0[bB][01]+">
```

        <token type="LiteralNumberBin"/>

```
      </rule>
```

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

        <token type="LiteralNumberHex"/>

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

        <token type="LiteralNumberOct"/>

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

        <token type="LiteralNumberInteger"/>

```
      </rule>
```

      <rule pattern="&#34;(\\\\|\\&#34;|[^&#34;])*&#34;">

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

      <rule pattern="&#39;(\\\\|\\&#39;|[^&#39;])*&#39;">

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

      <rule pattern="(=|\+=|-=|\*=|/=|\*\*=|%=|&amp;=|\|=|\^=|&amp;&amp;=|\|\|=|&lt;&lt;=|&gt;&gt;=|&lt;=&gt;|&lt;~&gt;|\.\.|by|#|\.\.\.|&amp;&amp;|\|\||!|&amp;|\||\^|~|&lt;&lt;|&gt;&gt;|==|!=|&lt;=|&gt;=|&lt;|&gt;|[+\-*/%]|\*\*)">

```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="[:;,.?()\[\]{}]">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
      <rule pattern="[a-zA-Z_][\w$]*">
```
```
        <token type="NameOther"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="classname">
```
```
      <rule pattern="[a-zA-Z_][\w$]*">
```
```
        <token type="NameClass"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```