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

```
<lexer>
```
```
  <config>
```
```
    <name>R</name>
```
```
    <alias>splus</alias>
```
```
    <alias>s</alias>
```
```
    <alias>r</alias>
```
```
    <filename>*.S</filename>
```
```
    <filename>*.R</filename>
```
```
    <filename>*.r</filename>
```
```
    <filename>.Rhistory</filename>
```
```
    <filename>.Rprofile</filename>
```
```
    <filename>.Renviron</filename>
```
```
    <mime_type>text/S-plus</mime_type>
```
```
    <mime_type>text/S</mime_type>
```

    <mime_type>text/x-r-source</mime_type>

```
    <mime_type>text/x-r</mime_type>
```
```
    <mime_type>text/x-R</mime_type>
```

    <mime_type>text/x-r-history</mime_type>

    <mime_type>text/x-r-profile</mime_type>

    <priority>0.1</priority> <!-- higher priority than Rebol -->

```
  </config>
```
```
  <rules>
```
```
    <state name="numbers">
```

      <rule pattern="0[xX][a-fA-F0-9]+([pP][0-9]+)?[Li]?">

        <token type="LiteralNumberHex"/>

```
      </rule>
```

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

```
        <token type="LiteralNumber"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="operators">
```

      <rule pattern="&lt;&lt;?-|-&gt;&gt;?|-|==|&lt;=|&gt;=|&lt;|&gt;|&amp;&amp;?|!=|\|\|?|\?">

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

      <rule pattern="\*|\+|\^|/|!|%[^%]*%|=|~|\$|@|:{1,3}">

```
        <token type="Operator"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="root">
```
```
      <rule>
```
```
        <include state="keywords"/>
```
```
      </rule>
```

      <rule pattern="((?:`[^`\\]*(?:\\.[^`\\]*)*`)|(?:(?:[a-zA-z]|[_.][^0-9])[\w_.]*))\s*(?=\()">

```
        <token type="NameFunction"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="statements"/>
```
```
      </rule>
```
```
      <rule pattern="\{|\}">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
      <rule pattern=".">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="valid_name">
```

      <rule pattern="(?:`[^`\\]*(?:\\.[^`\\]*)*`)|(?:(?:[a-zA-z]|[_.][^0-9])[\w_.]*)">

```
        <token type="Name"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="keywords">
```

      <rule pattern="(if|else|for|while|repeat|in|next|break|return|switch|function)(?![\w.])">

        <token type="KeywordReserved"/>

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

      <rule pattern="(NULL|NA(_(integer|real|complex|character)_)?|letters|LETTERS|Inf|TRUE|FALSE|NaN|pi|\.\.(\.|[0-9]+))(?![\w.])">

        <token type="KeywordConstant"/>

```
      </rule>
```
```
      <rule pattern="(T|F)\b">
```

        <token type="NameBuiltinPseudo"/>

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

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

```
        <token type="LiteralString"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="comments">
```
```
      <rule pattern="#.*$">
```
```
        <token type="CommentSingle"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="punctuation">
```

      <rule pattern="\[{1,2}|\]{1,2}|\(|\)|;|,">

```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="statements">
```
```
      <rule>
```
```
        <include state="comments"/>
```
```
      </rule>
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="\&#39;">
```
```
        <token type="LiteralString"/>
```
```
        <push state="string_squote"/>
```
```
      </rule>
```
```
      <rule pattern="\&#34;">
```
```
        <token type="LiteralString"/>
```
```
        <push state="string_dquote"/>
```
```
      </rule>
```
```
      <rule>
```

        <include state="builtin_symbols"/>

```
      </rule>
```
```
      <rule>
```
```
        <include state="valid_name"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="numbers"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="punctuation"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="operators"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="string_dquote">
```

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

```
        <token type="LiteralString"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```

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