Viewing github.com/alecthomas/chroma/lexers/embedded/c++.xml

```
<lexer>
```
```
  <config>
```
```
    <name>C++</name>
```
```
    <alias>cpp</alias>
```
```
    <alias>c++</alias>
```
```
    <filename>*.cpp</filename>
```
```
    <filename>*.hpp</filename>
```
```
    <filename>*.c++</filename>
```
```
    <filename>*.h++</filename>
```
```
    <filename>*.cc</filename>
```
```
    <filename>*.hh</filename>
```
```
    <filename>*.cxx</filename>
```
```
    <filename>*.hxx</filename>
```
```
    <filename>*.C</filename>
```
```
    <filename>*.H</filename>
```
```
    <filename>*.cp</filename>
```
```
    <filename>*.CPP</filename>
```
```
    <filename>*.tpp</filename>
```

    <mime_type>text/x-c++hdr</mime_type>

    <mime_type>text/x-c++src</mime_type>

```
    <ensure_nl>true</ensure_nl>
```
```
    <analyse first="true">
```

      <regex pattern="#include &lt;[a-z_]+>" score="0.2" />

      <regex pattern="using namespace " score="0.4" />

```
    </analyse>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="classname">
```

      <rule pattern="(\[\[.+\]\])(\s*)">

```
        <bygroups>
```

          <token type="NameAttribute"/>

```
          <token type="Text"/>
```
```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="[a-zA-Z_]\w*">
```
```
        <token type="NameClass"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="\s*(?=[&gt;{])">
```
```
        <token type="Text"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="whitespace">
```
```
      <rule pattern="^#if\s+0">
```
```
        <token type="CommentPreproc"/>
```
```
        <push state="if0"/>
```
```
      </rule>
```
```
      <rule pattern="^#">
```
```
        <token type="CommentPreproc"/>
```
```
        <push state="macro"/>
```
```
      </rule>
```

      <rule pattern="^(\s*(?:/[*].*?[*]/\s*)?)(#if\s+0)">

```
        <bygroups>
```
```
          <usingself state="root"/>
```

          <token type="CommentPreproc"/>

```
        </bygroups>
```
```
        <push state="if0"/>
```
```
      </rule>
```

      <rule pattern="^(\s*(?:/[*].*?[*]/\s*)?)(#)">

```
        <bygroups>
```
```
          <usingself state="root"/>
```

          <token type="CommentPreproc"/>

```
        </bygroups>
```
```
        <push state="macro"/>
```
```
      </rule>
```
```
      <rule pattern="\n">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="\s+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern="\\\n">
```
```
        <token type="Text"/>
```
```
      </rule>
```

      <rule pattern="//(\n|[\w\W]*?[^\\]\n)">

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

      <rule pattern="/(\\\n)?[*][\w\W]*?[*](\\\n)?/">

        <token type="CommentMultiline"/>

```
      </rule>
```

      <rule pattern="/(\\\n)?[*][\w\W]*">

        <token type="CommentMultiline"/>

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

      <rule pattern="(include)(\s+)(&quot;[^&quot;]+?&quot;|&lt;[^&gt;]+?&gt;)">

```
        <bygroups>
```

          <token type="CommentPreproc"/>

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

          <token type="CommentPreprocFile"/>

```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="[^/\n]+">
```
```
        <token type="CommentPreproc"/>
```
```
      </rule>
```

      <rule pattern="/[*](.|\n)*?[*]/">

        <token type="CommentMultiline"/>

```
      </rule>
```
```
      <rule pattern="//.*?\n">
```
```
        <token type="CommentSingle"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern="/">
```
```
        <token type="CommentPreproc"/>
```
```
      </rule>
```
```
      <rule pattern="(?&lt;=\\)\n">
```
```
        <token type="CommentPreproc"/>
```
```
      </rule>
```
```
      <rule pattern="\n">
```
```
        <token type="CommentPreproc"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="statements">
```

      <rule pattern="(reinterpret_cast|static_assert|thread_local|dynamic_cast|static_cast|const_cast|co_return|protected|namespace|consteval|constexpr|typename|co_await|co_yield|operator|restrict|explicit|template|override|noexcept|requires|decltype|alignof|private|alignas|virtual|mutable|nullptr|concept|export|friend|typeid|throws|public|delete|final|throw|catch|using|this|new|try)\b">

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

      <rule pattern="(enum)\b(\s+)(class)\b(\s*)">

```
        <bygroups>
```
```
          <token type="Keyword"/>
```
```
          <token type="Text"/>
```
```
          <token type="Keyword"/>
```
```
          <token type="Text"/>
```
```
        </bygroups>
```
```
        <push state="classname"/>
```
```
      </rule>
```

      <rule pattern="(class|struct|enum|union)\b(\s*)">

```
        <bygroups>
```
```
          <token type="Keyword"/>
```
```
          <token type="Text"/>
```
```
        </bygroups>
```
```
        <push state="classname"/>
```
```
      </rule>
```
```
      <rule pattern="\[\[.+\]\]">
```
```
        <token type="NameAttribute"/>
```
```
      </rule>
```

      <rule pattern="(R)(&#34;)([^\\()\s]{,16})(\()((?:.|\n)*?)(\)\3)(&#34;)">

```
        <bygroups>
```

          <token type="LiteralStringAffix"/>

          <token type="LiteralString"/>

          <token type="LiteralStringDelimiter"/>

          <token type="LiteralStringDelimiter"/>

          <token type="LiteralString"/>

          <token type="LiteralStringDelimiter"/>

          <token type="LiteralString"/>

```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="(u8|u|U)(&#34;)">
```
```
        <bygroups>
```

          <token type="LiteralStringAffix"/>

          <token type="LiteralString"/>

```
        </bygroups>
```
```
        <push state="string"/>
```
```
      </rule>
```
```
      <rule pattern="(L?)(&#34;)">
```
```
        <bygroups>
```

          <token type="LiteralStringAffix"/>

          <token type="LiteralString"/>

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

      <rule pattern="(L?)(&#39;)(\\.|\\[0-7]{1,3}|\\x[a-fA-F0-9]{1,2}|[^\\\&#39;\n])(&#39;)">

```
        <bygroups>
```

          <token type="LiteralStringAffix"/>

          <token type="LiteralStringChar"/>

          <token type="LiteralStringChar"/>

          <token type="LiteralStringChar"/>

```
        </bygroups>
```
```
      </rule>
```

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

        <token type="LiteralNumberFloat"/>

```
      </rule>
```

      <rule pattern="(\d+\.\d*|\.\d+|\d+[fF])[fF]?">

        <token type="LiteralNumberFloat"/>

```
      </rule>
```

      <rule pattern="0[xX]([0-9A-Fa-f](&#39;?[0-9A-Fa-f]+)*)[LlUu]*">

        <token type="LiteralNumberHex"/>

```
      </rule>
```

      <rule pattern="0(&#39;?[0-7]+)+[LlUu]*">

        <token type="LiteralNumberOct"/>

```
      </rule>
```

      <rule pattern="0[Bb][01](&#39;?[01]+)*[LlUu]*">

        <token type="LiteralNumberBin"/>

```
      </rule>
```

      <rule pattern="[0-9](&#39;?[0-9]+)*[LlUu]*">

        <token type="LiteralNumberInteger"/>

```
      </rule>
```
```
      <rule pattern="\*/">
```
```
        <token type="Error"/>
```
```
      </rule>
```

      <rule pattern="[~!%^&amp;*+=|?:&lt;&gt;/-]">

```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="[()\[\],.]">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```

      <rule pattern="(restricted|volatile|continue|register|default|typedef|struct|extern|switch|sizeof|static|return|union|while|const|break|goto|enum|else|case|auto|for|asm|if|do)\b">

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

      <rule pattern="(bool|int|long|float|short|double|char((8|16|32)_t)?|wchar_t|unsigned|signed|void|u?int(_fast|_least|)(8|16|32|64)_t)\b">

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

      <rule pattern="(typename|__inline|restrict|_inline|thread|inline|naked)\b">

        <token type="KeywordReserved"/>

```
      </rule>
```

      <rule pattern="(__m(128i|128d|128|64))\b">

        <token type="KeywordReserved"/>

```
      </rule>
```

      <rule pattern="__(forceinline|identifier|unaligned|declspec|fastcall|stdcall|finally|except|assume|int32|cdecl|int64|based|leave|int16|raise|noop|int8|w64|try|asm)\b">

        <token type="KeywordReserved"/>

```
      </rule>
```

      <rule pattern="(true|false|NULL)\b">

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

      <rule pattern="([a-zA-Z_]\w*)(\s*)(:)(?!:)">

```
        <bygroups>
```
```
          <token type="NameLabel"/>
```
```
          <token type="Text"/>
```
```
          <token type="Punctuation"/>
```
```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="[a-zA-Z_]\w*">
```
```
        <token type="Name"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="function">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="statements"/>
```
```
      </rule>
```
```
      <rule pattern=";">
```
```
        <token type="Punctuation"/>
```
```
      </rule>
```
```
      <rule pattern="\{">
```
```
        <token type="Punctuation"/>
```
```
        <push/>
```
```
      </rule>
```
```
      <rule pattern="\}">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="string">
```
```
      <rule pattern="&#34;">
```
```
        <token type="LiteralString"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```

      <rule pattern="\\([\\abfnrtv&#34;\&#39;]|x[a-fA-F0-9]{2,4}|u[a-fA-F0-9]{4}|U[a-fA-F0-9]{8}|[0-7]{1,3})">

        <token type="LiteralStringEscape"/>

```
      </rule>
```
```
      <rule pattern="[^\\&#34;\n]+">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
      <rule pattern="\\\n">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
      <rule pattern="\\">
```
```
        <token type="LiteralString"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="if0">
```

      <rule pattern="^\s*#if.*?(?&lt;!\\)\n">

```
        <token type="CommentPreproc"/>
```
```
        <push/>
```
```
      </rule>
```

      <rule pattern="^\s*#el(?:se|if).*\n">

```
        <token type="CommentPreproc"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```

      <rule pattern="^\s*#endif.*?(?&lt;!\\)\n">

```
        <token type="CommentPreproc"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
      <rule pattern=".*?\n">
```
```
        <token type="Comment"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="root">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```

      <rule pattern="((?:[\w*\s])+?(?:\s|[*]))([a-zA-Z_]\w*)(\s*\([^;]*?\))([^;{]*)(\{)">

```
        <bygroups>
```
```
          <usingself state="root"/>
```
```
          <token type="NameFunction"/>
```
```
          <usingself state="root"/>
```
```
          <usingself state="root"/>
```
```
          <token type="Punctuation"/>
```
```
        </bygroups>
```
```
        <push state="function"/>
```
```
      </rule>
```

      <rule pattern="((?:[\w*\s])+?(?:\s|[*]))([a-zA-Z_]\w*)(\s*\([^;]*?\))([^;]*)(;)">

```
        <bygroups>
```
```
          <usingself state="root"/>
```
```
          <token type="NameFunction"/>
```
```
          <usingself state="root"/>
```
```
          <usingself state="root"/>
```
```
          <token type="Punctuation"/>
```
```
        </bygroups>
```
```
      </rule>
```
```
      <rule>
```
```
        <push state="statement"/>
```
```
      </rule>
```

      <rule pattern="__(multiple_inheritance|virtual_inheritance|single_inheritance|interface|uuidof|super|event)\b">

        <token type="KeywordReserved"/>

```
      </rule>
```

      <rule pattern="__(offload|blockingoffload|outer)\b">

```
        <token type="KeywordPseudo"/>
```
```
      </rule>
```
```
    </state>
```
```
    <state name="statement">
```
```
      <rule>
```
```
        <include state="whitespace"/>
```
```
      </rule>
```
```
      <rule>
```
```
        <include state="statements"/>
```
```
      </rule>
```
```
      <rule pattern="[{]">
```
```
        <token type="Punctuation"/>
```
```
        <push state="root"/>
```
```
      </rule>
```
```
      <rule pattern="[;}]">
```
```
        <token type="Punctuation"/>
```
```
        <pop depth="1"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```