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

```
<lexer>
```
```
  <config>
```
```
    <name>PromQL</name>
```
```
    <alias>promql</alias>
```
```
    <filename>*.promql</filename>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="range">
```
```
      <rule pattern="\]">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```

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

```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="function">
```
```
      <rule pattern="\)">
```
```
        <token type="Operator"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="\(">
```
```
        <token type="Operator"/>
```
```
        <push/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="root">
```
```
      <rule pattern="\n">
```
```
        <token type="TextWhitespace"/>
```
```
      </rule>
```
```
      <rule pattern="\s+">
```
```
        <token type="TextWhitespace"/>
```
```
      </rule>
```
```
      <rule pattern=",">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```

      <rule pattern="(group_right|group_left|ignoring|without|offset|bool|on|by)\b">

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

      <rule pattern="(count_values|quantile|bottomk|stdvar|stddev|count|group|topk|sum|min|max|avg)\b">

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

      <rule pattern="(histogram_quantile|quantile_over_time|absent_over_time|stdvar_over_time|stddev_over_time|count_over_time|predict_linear|label_replace|max_over_time|avg_over_time|sum_over_time|days_in_month|min_over_time|day_of_month|holt_winters|day_of_week|label_join|sort_desc|clamp_max|timestamp|clamp_min|increase|changes|resets|vector|absent|idelta|minute|scalar|log10|delta|month|floor|deriv|round|irate|rate|year|sort|log2|sqrt|ceil|time|hour|abs|exp|ln)\b">

        <token type="KeywordReserved"/>

```
      </rule>
```

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

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

      <rule pattern="-?[0-9]+\.[0-9]+">

        <token type="LiteralNumberFloat"/>

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

        <token type="LiteralNumberInteger"/>

```
      </rule>
```
```
      <rule pattern="#.*?$">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```

      <rule pattern="(\+|\-|\*|\/|\%|\^)">

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

      <rule pattern="==|!=|&gt;=|&lt;=|&lt;|&gt;">

```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="and|or|unless">
```
```
        <token type="OperatorWord"/>
```
```
      </rule>
```

      <rule pattern="[_a-zA-Z][a-zA-Z0-9_]+">

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

      <rule pattern="([&#34;\&#39;])(.*?)([&#34;\&#39;])">

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

          <token type="LiteralString"/>

```
          <token type="Punctuation"/>
```
```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="\(">
```
```
        <token type="Operator"/>
```
```
        <push state="function"/>
```
```
      </rule>
```
```
      <rule pattern="\)">
```
```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="\{">
```
```
        <token type="Punctuation"/>
```
```
        <push state="labels"/>
```
```
      </rule>
```
```
      <rule pattern="\[">
```
```
        <token type="Punctuation"/>
```
```
        <push state="range"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="labels">
```
```
      <rule pattern="\}">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="\n">
```
```
        <token type="TextWhitespace"/>
```
```
      </rule>
```
```
      <rule pattern="\s+">
```
```
        <token type="TextWhitespace"/>
```
```
      </rule>
```
```
      <rule pattern=",">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```

      <rule pattern="([_a-zA-Z][a-zA-Z0-9_]*?)(\s*?)(=~|!=|=|!~)(\s*?)(&#34;|&#39;)(.*?)(&#34;|&#39;)">

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

          <token type="TextWhitespace"/>

```
          <token type="Operator"/>
```

          <token type="TextWhitespace"/>

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

          <token type="LiteralString"/>

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