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First piece of Go reference manual.

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<h2>Introduction</h2>
<p>
This is a reference manual for the Go programming language. For more information and other documents, see <a href="/">the Go home page</a>.
</p>
<p>
Go is a general-purpose language designed with systems programming in mind. It is strongly typed and garbage-collected, and has explicit support for concurrent programming. Programs are constructed from <i>packages</i>, whose properties allow efficient management of dependencies. The existing implementations use a traditional compile/link model to generate executable binaries.
</p>
<p>
The grammar is simple and regular, allowing for easy analysis by automatic tools such as integrated development environments.
</p>
<h2>Lexical properties</h2>
<p>
A program is constructed from a set of <i>packages</i>. Each package is defined by one or more source files compiled separately. In processing the source text in each file, the input is divided into a sequence of <i>tokens</i>.
</p>
<h3>Unicode text</h3>
<p>
Go source text is a sequence of Unicode code points encoded in UTF-8. The language processor does not canonicalize the input, so it will treat a single accented code point as distinct from the same character constructed from combining an accent and a letter; those are treated as two code points. For simplicity, this document will use the term <i>character</i> to refer to a Unicode code point.
</p>
<p>
Each code point is distinct; for example, upper and lower case letters are different characters.
</p>
<h3>Tokens</h3>
<p>
There are four classes of tokens: identifiers, keywords, operators and delimiters, and literals. <i>White space</i>, formed from blanks, tabs, and newlines, is ignored except as it separates tokens that would otherwise combine into a single token. Comments, defined below, behave as white space. While breaking the input into tokens, the next token is the longest sequence of characters that form a valid token.
</p>
<h3>Comments</h3>
<p>
There are two forms of comments. The first starts at a the character sequence <tt>//</tt> and continues through the next newline. The second starts at the character sequence <tt>/*</tt> and continues through the character sequence <tt>*/</tt>. Comments do not nest.
</p>
<h3>Identifiers</h3>
<p>
An identifier is a sequence of one or more letters and digits. The meaning of <i>letter</i> and <i>digit</i> is defined by the Unicode properties for the corresponding characters, with the addition that the underscore character <tt>_</tt> (U+005F) is considered a letter. The first character in an identifier must be a letter. <font color=red>(Current implementation accepts only ASCII digits for digits.)</font>
</p>
<h3>Keywords</h3>
<p>
The following keywords are reserved and may not be used as identifiers.
</p>
<pre>
break default func interface select
case defer go map struct
chan else goto package switch
const fallthrough if range type
continue for import return var
</pre>
<h3>Operators and Delimiters</h3>
<p>
The following character sequences are tokens representing operators, delimiters, and other special lexemes:
</p>
<pre>
+ &amp; += &amp;= &amp;&amp; == != ( )
- | -= |= || &lt; &lt;= [ ]
* ^ *= ^= &lt;- &gt; &gt;= { }
/ << /= <<= ++ = := , ;
% >> %= >>= -- ! ... . :
</pre>
<h3>Literals</h3>
<h4>Integer literals</h4>
<h4>Floating-point literals</h4>
<h4>Character literals</h4>
<h4>String literals</h4>
</div>
<br class="clearboth" />
<div id="pageFooter">
<p><span class="conf">Google Confidential:</span> For Internal Use Only.<br />&copy;&nbsp;2009 Google, Inc. All Rights Reserved.</p>
</div>
</body>
</html>