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

```
<lexer>
```
```
  <config>
```
```
    <name>Nix</name>
```
```
    <alias>nixos</alias>
```
```
    <alias>nix</alias>
```
```
    <filename>*.nix</filename>
```
```
    <mime_type>text/x-nix</mime_type>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="space">
```
```
      <rule pattern="[ \t\r\n]+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="paren">
```
```
      <rule pattern="\)">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="root"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="scope">
```
```
      <rule pattern="}:">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="}">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```

      <rule pattern="in(?![a-zA-Z0-9_&#39;-])">

```
        <token type="Keyword"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="\${">
```

        <token type="LiteralStringInterpol"/>

```
        <push state="interpol"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="root"/>
```
```
      </rule>
```
```
      <rule pattern="(=|\?|,)">
```
```
        <token type="Operator"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="builtins">
```

      <rule pattern="throw(?![a-zA-Z0-9_&#39;-])">

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

      <rule pattern="(dependencyClosure|fetchTarball|filterSource|currentTime|removeAttrs|baseNameOf|derivation|toString|builtins|getAttr|hasAttr|getEnv|isNull|abort|dirOf|toXML|map)(?![a-zA-Z0-9_&#39;-])">

```
        <token type="NameBuiltin"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="literals">
```

      <rule pattern="(false|true|null)(?![a-zA-Z0-9_&#39;-])">

```
        <token type="NameConstant"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="uri"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="path"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="int"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="float"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="keywords">
```

      <rule pattern="import(?![a-zA-Z0-9_&#39;-])">

        <token type="KeywordNamespace"/>

```
      </rule>
```

      <rule pattern="(inherit|assert|with|then|else|rec|if)(?![a-zA-Z0-9_&#39;-])">

```
        <token type="Keyword"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="list">
```
```
      <rule pattern="\]">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="root"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="operators">
```
```
      <rule pattern=" [/-] ">
```
```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="(\.)(\${)">
```
```
        <bygroups>
```
```
          <token type="Operator"/>
```

          <token type="LiteralStringInterpol"/>

```
        </bygroups>
```
```
        <push state="interpol"/>
```
```
      </rule>
```
```
      <rule pattern="(\?)(\s*)(\${)">
```
```
        <bygroups>
```
```
          <token type="Operator"/>
```
```
          <token type="Text"/>
```

          <token type="LiteralStringInterpol"/>

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

      <rule pattern="(&amp;&amp;|&gt;=|&lt;=|\+\+|-&gt;|!=|\|\||//|==|@|!|\+|\?|&lt;|\.|&gt;|\*)">

```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="[;:]">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="comment">
```
```
      <rule pattern="\*/">
```

        <token type="CommentMultiline"/>

```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern=".|\n">
```

        <token type="CommentMultiline"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="interpol">
```
```
      <rule pattern="}">
```

        <token type="LiteralStringInterpol"/>

```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="root"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="path">
```

      <rule pattern="[a-zA-Z0-9._+-]*(/[a-zA-Z0-9._+-]+)+">

        <token type="LiteralStringRegex"/>

```
      </rule>
```

      <rule pattern="~(/[a-zA-Z0-9._+-]+)+/?">

        <token type="LiteralStringRegex"/>

```
      </rule>
```

      <rule pattern="&lt;[a-zA-Z0-9._+-]+(/[a-zA-Z0-9._+-]+)*&gt;">

        <token type="LiteralStringRegex"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="float">
```

      <rule pattern="-?(([1-9][0-9]*\.[0-9]*)|(0?\.[0-9]+))([Ee][+-]?[0-9]+)?(?![a-zA-Z0-9_&#39;-])">

        <token type="LiteralNumberFloat"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="root">
```
```
      <rule>
```
```
        <include state="keywords"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="builtins"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="literals"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="operators"/>
```
```
      </rule>
```
```
      <rule pattern="#.*$">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```
```
      <rule pattern="/\*">
```

        <token type="CommentMultiline"/>

```
        <push state="comment"/>
```
```
      </rule>
```
```
      <rule pattern="\(">
```
```
        <token type="Punctuation"/>
```
```
        <push state="paren"/>
```
```
      </rule>
```
```
      <rule pattern="\[">
```
```
        <token type="Punctuation"/>
```
```
        <push state="list"/>
```
```
      </rule>
```
```
      <rule pattern="&#34;">
```

        <token type="LiteralStringDouble"/>

```
        <push state="qstring"/>
```
```
      </rule>
```
```
      <rule pattern="&#39;&#39;">
```

        <token type="LiteralStringSingle"/>

```
        <push state="istring"/>
```
```
      </rule>
```
```
      <rule pattern="{">
```
```
        <token type="Punctuation"/>
```
```
        <push state="scope"/>
```
```
      </rule>
```

      <rule pattern="let(?![a-zA-Z0-9_&#39;-])">

```
        <token type="Keyword"/>
```
```
        <push state="scope"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="id"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="space"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="int">
```

      <rule pattern="-?[0-9]+(?![a-zA-Z0-9_&#39;-])">

        <token type="LiteralNumberInteger"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="uri">
```

      <rule pattern="[a-zA-Z][a-zA-Z0-9+.-]*:[a-zA-Z0-9%/?:@&amp;=+$,_.!~*&#39;-]+">

        <token type="LiteralStringDoc"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="qstring">
```
```
      <rule pattern="&#34;">
```

        <token type="LiteralStringDouble"/>

```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="\${">
```

        <token type="LiteralStringInterpol"/>

```
        <push state="interpol"/>
```
```
      </rule>
```
```
      <rule pattern="\\.">
```

        <token type="LiteralStringEscape"/>

```
      </rule>
```
```
      <rule pattern=".|\n">
```

        <token type="LiteralStringDouble"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="istring">
```
```
      <rule pattern="&#39;&#39;\$">
```

        <token type="LiteralStringEscape"/>

```
      </rule>
```
```
      <rule pattern="&#39;&#39;&#39;">
```

        <token type="LiteralStringEscape"/>

```
      </rule>
```
```
      <rule pattern="&#39;&#39;\\.">
```

        <token type="LiteralStringEscape"/>

```
      </rule>
```
```
      <rule pattern="&#39;&#39;">
```

        <token type="LiteralStringSingle"/>

```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="\${">
```

        <token type="LiteralStringInterpol"/>

```
        <push state="interpol"/>
```
```
      </rule>
```
```
      <rule pattern="\$.">
```

        <token type="LiteralStringSingle"/>

```
      </rule>
```
```
      <rule pattern=".|\n">
```

        <token type="LiteralStringSingle"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="id">
```

      <rule pattern="[a-zA-Z_][a-zA-Z0-9_&#39;-]*">

```
        <token type="Name"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```