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

```
<lexer>
```
```
  <config>
```
```
    <name>Prolog</name>
```
```
    <alias>prolog</alias>
```
```
    <filename>*.ecl</filename>
```
```
    <filename>*.prolog</filename>
```
```
    <filename>*.pro</filename>
```
```
    <filename>*.pl</filename>
```

    <mime_type>text/x-prolog</mime_type>

```
  </config>
```
```
  <rules>
```
```
    <state name="root">
```
```
      <rule pattern="/\*">
```

        <token type="CommentMultiline"/>

```
        <push state="nested-comment"/>
```
```
      </rule>
```
```
      <rule pattern="%.*">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```
```
      <rule pattern="0\&#39;.">
```

        <token type="LiteralStringChar"/>

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

        <token type="LiteralNumberBin"/>

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

        <token type="LiteralNumberOct"/>

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

        <token type="LiteralNumberHex"/>

```
      </rule>
```

      <rule pattern="\d\d?\&#39;[a-zA-Z0-9]+">

        <token type="LiteralNumberInteger"/>

```
      </rule>
```

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

        <token type="LiteralNumberFloat"/>

```
      </rule>
```
```
      <rule pattern="\d+">
```

        <token type="LiteralNumberInteger"/>

```
      </rule>
```
```
      <rule pattern="[\[\](){}|.,;!]">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
      <rule pattern=":-|--&gt;">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```

      <rule pattern="&#34;(?:\\x[0-9a-fA-F]+\\|\\u[0-9a-fA-F]{4}|\\U[0-9a-fA-F]{8}|\\[0-7]+\\|\\[&#34;\nabcefnrstv]|[^\\&#34;])*&#34;">

        <token type="LiteralStringDouble"/>

```
      </rule>
```

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

        <token type="LiteralStringAtom"/>

```
      </rule>
```
```
      <rule pattern="is\b">
```
```
        <token type="Operator"/>
```
```
      </rule>
```

      <rule pattern="(&lt;|&gt;|=&lt;|&gt;=|==|=:=|=|/|//|\*|\+|-)(?=\s|[a-zA-Z0-9\[])">

```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="(mod|div|not)\b">
```
```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="_">
```
```
        <token type="Keyword"/>
```
```
      </rule>
```
```
      <rule pattern="([a-z]+)(:)">
```
```
        <bygroups>
```

          <token type="NameNamespace"/>

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

      <rule pattern="([a-zÀ-῿぀-퟿-￯][\w$À-῿぀-퟿-￯]*)(\s*)(:-|--&gt;)">

```
        <bygroups>
```
```
          <token type="NameFunction"/>
```
```
          <token type="Text"/>
```
```
          <token type="Operator"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="([a-zÀ-῿぀-퟿-￯][\w$À-῿぀-퟿-￯]*)(\s*)(\()">

```
        <bygroups>
```
```
          <token type="NameFunction"/>
```
```
          <token type="Text"/>
```
```
          <token type="Punctuation"/>
```
```
        </bygroups>
```
```
      </rule>
```

      <rule pattern="[a-zÀ-῿぀-퟿-￯][\w$À-῿぀-퟿-￯]*">

        <token type="LiteralStringAtom"/>

```
      </rule>
```

      <rule pattern="[#&amp;*+\-./:&lt;=&gt;?@\\^~¡-¿‐-〿]+">

        <token type="LiteralStringAtom"/>

```
      </rule>
```
```
      <rule pattern="[A-Z_]\w*">
```
```
        <token type="NameVariable"/>
```
```
      </rule>
```

      <rule pattern="\s+|[ -‏￰-�￯]">

```
        <token type="Text"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="nested-comment">
```
```
      <rule pattern="\*/">
```

        <token type="CommentMultiline"/>

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

        <token type="CommentMultiline"/>

```
        <push/>
```
```
      </rule>
```
```
      <rule pattern="[^*/]+">
```

        <token type="CommentMultiline"/>

```
      </rule>
```
```
      <rule pattern="[*/]">
```

        <token type="CommentMultiline"/>

```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```

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