mirror of
https://github.com/golang/go
synced 2024-11-11 23:20:24 -07:00
First piece of Go reference manual.
R=ken,gri,rsc DELTA=185 (185 added, 0 deleted, 0 changed) OCL=25133 CL=25169
This commit is contained in:
parent
ebc10db3e1
commit
d1107adb52
93
doc/go_ref.html
Normal file
93
doc/go_ref.html
Normal file
@ -0,0 +1,93 @@
|
||||
|
||||
<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>
|
||||
+ & += &= && == != ( )
|
||||
- | -= |= || < <= [ ]
|
||||
* ^ *= ^= <- > >= { }
|
||||
/ << /= <<= ++ = := , ;
|
||||
% >> %= >>= -- ! ... . :
|
||||
</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 />© 2009 Google, Inc. All Rights Reserved.</p>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
Loading…
Reference in New Issue
Block a user