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/usr/share/medit-1/language-specs/go.lang is in medit 1.0.3-1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!--

 Authors: Jim Teeuwen
 Copyright (C) 2009-2010 Jim Teeuwen <jimteeuwen@gmail.com>
 Copyright (C) 2010 Kenny Meyer <knny.myer@gmail.com>

 GtkSourceView is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 GtkSourceView is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

-->
<language id="go" _name="Go" version="2.0" _section="Sources">
  <metadata>
    <property name="mimetype">text/x-go</property>
    <property name="globs">*.go</property>
    <property name="line-comment-start">//</property>
    <property name="block-comment-start">/*</property>
    <property name="block-comment-end">*/</property>
  </metadata>

  <styles>
    <style id="comment"           _name="Comment"             map-to="def:comment"/>
    <style id="error"             _name="Error"               map-to="def:error"/>
    <style id="string"            _name="String"              map-to="def:string"/>
    <style id="included-file"     _name="Included File"       map-to="def:string"/>
    <style id="char"              _name="Character"           map-to="def:character"/>
    <style id="keyword"           _name="Keyword"             map-to="def:keyword"/>
    <style id="type"              _name="Data Type"           map-to="def:type"/>
    <style id="storage-class"     _name="Storage Class"       map-to="def:type"/>
    <style id="escaped-character" _name="Escaped Character"   map-to="def:special-char"/>
    <style id="floating-point"    _name="Floating point number" map-to="def:floating-point"/>
    <style id="decimal"           _name="Decimal number"      map-to="def:decimal"/>
    <style id="octal"             _name="Octal number"        map-to="def:base-n-integer"/>
    <style id="hexadecimal"       _name="Hexadecimal number"  map-to="def:base-n-integer"/>
    <style id="boolean"           _name="Boolean value"       map-to="def:boolean"/>
  </styles>

  <definitions>
    <define-regex id="escaped-character" extended="true">
      \\(                   # leading backslash
      [\\\"\'nrbtfav\?] |   # escaped character
      [0-7]{1,3} |          # one, two, or three octal digits
      x[0-9A-Fa-f]+         # 'x' followed by hex digits
      )
    </define-regex>

    <context id="comment" style-ref="comment" end-at-line-end="true" class-disabled="no-spell-check">
      <start>//</start>
      <include>
        <context ref="def:in-line-comment"/>
      </include>
    </context>

    <context id="comment-multiline" style-ref="comment" class-disabled="no-spell-check">
      <start>/\*</start>
      <end>\*/</end>
      <include>
        <context ref="def:in-comment"/>
      </include>
    </context>

    <context id="close-comment-outside-comment" style-ref="error">
      <match>\*/(?!\*)</match>
    </context>

    <context id="quoted-string" style-ref="string" end-at-line-end="true" class-disabled="no-spell-check">
      <start>"</start>
      <end>"</end>
      <include>
        <context id="escaped-character" style-ref="escaped-character">
          <match>\%{escaped-character}</match>
        </context>
      <context ref="def:line-continue"/>
      </include>
    </context>

    <context id="backquote-string" style-ref="string" end-at-line-end="false" class-disabled="no-spell-check">
      <start>`</start>
      <end>`</end>
      <include>
        <context ref="escaped-character"/>
        <context ref="def:line-continue"/>
      </include>
    </context>

    <context id="char" style-ref="char">
      <match>'(\%{escaped-character}|.)'</match>
    </context>

    <context id="float" style-ref="floating-point">
      <match extended="true">
        (?&lt;![\w\.])
        ((\.[0-9]+ | [0-9]+\.[0-9]*) ([Ee][+-]?[0-9]*)? |
        ([0-9]+[Ee][+-]?[0-9]*))
        [fFlL]?
        (?![\w\.])
      </match>
    </context>

    <context id="hexadecimal" style-ref="hexadecimal">
      <match extended="true">
        (?&lt;![\w\.])
        0[xX][a-fA-F0-9]+
        (?![\w\.])
      </match>
    </context>

    <context id="octal" style-ref="octal">
      <match extended="true">
        (?&lt;![\w\.])
        0[0-7]+
        (?![\w\.])
      </match>
    </context>

    <context id="decimal" style-ref="decimal">
      <match extended="true">
        (?&lt;![\w\.])
        [0-9]+
        (?![\w\.])
      </match>
    </context>

    <context id="boolean" style-ref="boolean">
      <match extended="true">
        (?&lt;![\w\.])
        (true|false)
        (?![\w\.])
      </match>
    </context>

    <context id="keywords" style-ref="keyword">
      <keyword>break</keyword>
      <keyword>case</keyword>
      <keyword>chan</keyword>
      <keyword>const</keyword>
      <keyword>continue</keyword>
      <keyword>default</keyword>
      <keyword>defer</keyword>
      <keyword>else</keyword>
      <keyword>fallthrough</keyword>
      <keyword>for</keyword>
      <keyword>func</keyword>
      <keyword>go</keyword>
      <keyword>goto</keyword>
      <keyword>if</keyword>
      <keyword>import</keyword>
      <keyword>interface</keyword>
      <keyword>map</keyword>
      <keyword>package</keyword>
      <keyword>range</keyword>
      <keyword>return</keyword>
      <keyword>select</keyword>
      <keyword>struct</keyword>
      <keyword>switch</keyword>
      <keyword>this</keyword>
      <keyword>type</keyword>
      <keyword>var</keyword>
    </context>

    <context id="types" style-ref="type">
      <keyword>uint8</keyword>
      <keyword>uint16</keyword>
      <keyword>uint32</keyword>
      <keyword>uint64</keyword>
      <keyword>int8</keyword>
      <keyword>int16</keyword>
      <keyword>int32</keyword>
      <keyword>int64</keyword>
      <keyword>float32</keyword>
      <keyword>float64</keyword>
      <keyword>complex64</keyword>
      <keyword>complex128</keyword>
      <keyword>byte</keyword>
      <keyword>uint</keyword>
      <keyword>int</keyword>
      <keyword>float</keyword>
      <keyword>complex</keyword>
      <keyword>uintptr</keyword>
      <keyword>string</keyword>
      <keyword>nil</keyword>
      <keyword>bool</keyword>
    </context>

    <context id="go" class="no-spell-check">
      <include>
        <context ref="comment"/>
        <context ref="comment-multiline"/>
        <context ref="close-comment-outside-comment"/>
        <context ref="quoted-string"/>
        <context ref="backquote-string"/>
        <context ref="char"/>
        <context ref="float"/>
        <context ref="hexadecimal"/>
        <context ref="octal"/>
        <context ref="decimal"/>
        <context ref="boolean"/>
        <context ref="keywords"/>
        <context ref="types"/>
      </include>
    </context>

  </definitions>
</language>