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<title>Boost Escaped List Separator</title>
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<h1 align="left"><img src="../../boost.png" alt="C++ Boost" width="277"
height="86"></h1>
<h1 align="center">Escaped List Separator</h1>
<div align="left">
<pre>
escaped_list_separator<Char, Traits = std::char_traits<Char> >
</pre>
</div>
<p>The <tt>escaped_list_separator</tt> class is an implementation of the
<a href="tokenizerfunction.htm">TokenizerFunction</a>. The
escaped_list_separator parses a superset of the csv (comma separated value)
format. The examples of this formate are below. It is assumed that the
default characters for separator, quote, and escape are used.</p>
<p>Field 1,Field 2,Field 3<br>
Field 1,"Field 2, with comma",Field 3<br>
Field 1,Field 2 with \"embedded quote\",Field 3<br>
Field 1, Field 2 with \n new line,Field 3<br>
Field 1, Field 2 with embedded \\ ,Field 3</p>
<p>Fields are normally separated by commas. If you want to put a comma in a
field, you need to put quotes around it. Also 3 escape sequences are
supported</p>
<table border="1" summary="">
<tr>
<td>
<p align="center"><strong>Escape Sequence</strong></p>
</td>
<td>
<p align="center"><strong>Result</strong></p>
</td>
</tr>
<tr>
<td><escape><quote></td>
<td><quote></td>
</tr>
<tr>
<td><escape>n</td>
<td>newline</td>
</tr>
<tr>
<td><escape><escape></td>
<td><escape></td>
</tr>
</table>
<p>Where <quote> is any character specified to be a quote
and<escape> is any character specified to be an escape character.</p>
<h2>Example</h2>
<pre>
// simple_example_2.cpp
#include<iostream>
#include<boost/tokenizer.hpp>
#include<string>
int main(){
using namespace std;
using namespace boost;
string s = "Field 1,\"putting quotes around fields, allows commas\",Field 3";
tokenizer<escaped_list_separator<char> > tok(s);
for(tokenizer<escaped_list_separator<char> >::iterator beg=tok.begin(); beg!=tok.end();++beg){
cout << *beg << "\n";
}
}
</pre>
<p> </p>
<h2>Construction and Usage</h2>
<p>escaped_list_separator has 2 constructors. They are as follows</p>
<pre>
explicit escaped_list_separator(Char e = '\\', Char c = ',',Char q = '\"')
</pre>
<table border="1" summary="">
<tr>
<td>
<p align="center"><strong>Parameter</strong></p>
</td>
<td>
<p align="center"><strong>Description</strong></p>
</td>
</tr>
<tr>
<td>e</td>
<td>Specifies the character to use for escape sequences. It defaults to
the C style \ (backslash). However you can override by passing in a
different character. An example of when you might want to do this is
when you have many fields which are Windows style filenames. Instead of
escaping out each \ in the path, you can change the escape to something
else.</td>
</tr>
<tr>
<td>c</td>
<td>Specifies the character to use to separate the fields</td>
</tr>
<tr>
<td>q</td>
<td>Specifies the character to use for the quote.</td>
</tr>
</table>
<p> </p>
<pre>
escaped_list_separator(string_type e, string_type c, string_type q):
</pre>
<table border="1" summary="">
<tr>
<td>
<p align="center"><strong>Parameter</strong></p>
</td>
<td>
<p align="center"><strong>Description</strong></p>
</td>
</tr>
<tr>
<td>e</td>
<td>Any character in the string e, is considered to be an escape
character. If an empty string is given, then there are no escape
characters.</td>
</tr>
<tr>
<td>c</td>
<td>Any character in the string c, is considered to be a separator. If
an empty string is given, then there are no separator characters.</td>
</tr>
<tr>
<td>q</td>
<td>Any character in the string q, is considered to be a quote. If an
empty string is given, then there are no quote characters.</td>
</tr>
</table>
<p> </p>
<p>To use this class, pass an object of it anywhere in the Tokenizer
package where a TokenizerFunction is required.</p>
<p> </p>
<h2>Template Parameters</h2>
<table border="1" summary="">
<tr>
<th><strong>Parameter</strong></th>
<th><strong>Description</strong></th>
</tr>
<tr>
<td><tt>Char</tt></td>
<td>The type of the elements within a token, typically
<tt>char</tt>.</td>
</tr>
<tr>
<td>Traits</td>
<td>The traits class for the Char type. This is used for comparing
Char's. It defaults to std::char_traits<Char></td>
</tr>
</table>
<p> </p>
<h2>Model of</h2>
<p><a href="tokenizerfunction.htm">TokenizerFunction</a></p>
<p> </p>
<hr>
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<p>Revised
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->25
December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38518" --></p>
<p><i>Copyright © 2001 John R. Bandela</i></p>
<p><i>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
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