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

```
<lexer>
```
```
  <config>
```
```
    <name>BibTeX</name>
```
```
    <alias>bib</alias>
```
```
    <alias>bibtex</alias>
```
```
    <filename>*.bib</filename>
```

    <mime_type>text/x-bibtex</mime_type>

    <case_insensitive>true</case_insensitive>

    <not_multiline>true</not_multiline>

```
  </config>
```
```
  <rules>
```
```
    <state name="closing-brace">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```
```
      <rule pattern="[})]">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="braced-string">
```
```
      <rule pattern="\{">
```
```
        <token type="LiteralString"/>
```
```
        <push/>
```
```
      </rule>
```
```
      <rule pattern="\}">
```
```
        <token type="LiteralString"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="[^\{\}]+">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="whitespace">
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="value">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```

      <rule pattern="[a-z_@!$&amp;*+\-./:;&lt;&gt;?\[\\\]^`|~][\w@!$&amp;*+\-./:;&lt;&gt;?\[\\\]^`|~]*">

```
        <token type="NameVariable"/>
```
```
      </rule>
```
```
      <rule pattern="&#34;">
```
```
        <token type="LiteralString"/>
```
```
        <push state="quoted-string"/>
```
```
      </rule>
```
```
      <rule pattern="\{">
```
```
        <token type="LiteralString"/>
```
```
        <push state="braced-string"/>
```
```
      </rule>
```
```
      <rule pattern="[\d]+">
```
```
        <token type="LiteralNumber"/>
```
```
      </rule>
```
```
      <rule pattern="#">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="quoted-string">
```
```
      <rule pattern="\{">
```
```
        <token type="LiteralString"/>
```
```
        <push state="braced-string"/>
```
```
      </rule>
```
```
      <rule pattern="&#34;">
```
```
        <token type="LiteralString"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="[^\{\&#34;]+">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="root">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```
```
      <rule pattern="@comment">
```
```
        <token type="Comment"/>
```
```
      </rule>
```
```
      <rule pattern="@preamble">
```
```
        <token type="NameClass"/>
```

        <push state="closing-brace" state="value" state="opening-brace"/>

```
      </rule>
```
```
      <rule pattern="@string">
```
```
        <token type="NameClass"/>
```

        <push state="closing-brace" state="field" state="opening-brace"/>

```
      </rule>
```

      <rule pattern="@[a-z_@!$&amp;*+\-./:;&lt;&gt;?\[\\\]^`|~][\w@!$&amp;*+\-./:;&lt;&gt;?\[\\\]^`|~]*">

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

        <push state="closing-brace" state="command-body" state="opening-brace"/>

```
      </rule>
```
```
      <rule pattern=".+">
```
```
        <token type="Comment"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="command-body">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```
```
      <rule pattern="[^\s\,\}]+">
```
```
        <token type="NameLabel"/>
```

        <push state="#pop" state="fields"/>

```
      </rule>
```
```
    </state>
```
```
    <state name="fields">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```
```
      <rule pattern=",">
```
```
        <token type="Punctuation"/>
```
```
        <push state="field"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="=">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```
```
      <rule pattern="=">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="field">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```

      <rule pattern="[a-z_@!$&amp;*+\-./:;&lt;&gt;?\[\\\]^`|~][\w@!$&amp;*+\-./:;&lt;&gt;?\[\\\]^`|~]*">

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

        <push state="value" state="="/>

```
      </rule>
```
```
      <rule>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="opening-brace">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```
```
      <rule pattern="[{(]">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```

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