232 lines
6.0 KiB
HTML
232 lines
6.0 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
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<meta name="GENERATOR" content="Microsoft FrontPage 6.0">
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<meta name="ProgId" content="FrontPage.Editor.Document">
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<title>Boost Escaped List Separator</title>
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</head>
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<body bgcolor="#FFFFFF" text="#000000" link="#0000EE" vlink="#551A8B" alink=
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"#FF0000">
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<h1 align="left"><img src="../../../boost.png" alt="C++ Boost" width="277"
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height="86"></h1>
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<h1 align="center">Escaped List Separator</h1>
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<div align="left">
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<pre>
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escaped_list_separator<Char, Traits = std::char_traits<Char> >
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</pre>
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</div>
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<p>The <tt>escaped_list_separator</tt> class is an implementation of the
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<a href="tokenizerfunction.htm">TokenizerFunction</a>. The
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escaped_list_separator parses a superset of the csv (comma separated value)
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format. The examples of this formate are below. It is assumed that the
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default characters for separator, quote, and escape are used.</p>
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<p>Field 1,Field 2,Field 3<br>
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Field 1,"Field 2, with comma",Field 3<br>
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Field 1,Field 2 with \"embedded quote\",Field 3<br>
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Field 1, Field 2 with \n new line,Field 3<br>
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Field 1, Field 2 with embedded \\ ,Field 3</p>
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<p>Fields are normally separated by commas. If you want to put a comma in a
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field, you need to put quotes around it. Also 3 escape sequences are
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supported</p>
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<table border="1" summary="">
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<tr>
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<td>
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<p align="center"><strong>Escape Sequence</strong></p>
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</td>
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<td>
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<p align="center"><strong>Result</strong></p>
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</td>
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</tr>
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<tr>
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<td><escape><quote></td>
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<td><quote></td>
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</tr>
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<tr>
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<td><escape>n</td>
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<td>newline</td>
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</tr>
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<tr>
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<td><escape><escape></td>
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<td><escape></td>
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</tr>
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</table>
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<p>Where <quote> is any character specified to be a quote
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and<escape> is any character specified to be an escape character.</p>
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<h2>Example</h2>
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<pre>
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// simple_example_2.cpp
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#include<iostream>
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#include<boost/tokenizer.hpp>
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#include<string>
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int main(){
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using namespace std;
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using namespace boost;
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string s = "Field 1,\"putting quotes around fields, allows commas\",Field 3";
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tokenizer<escaped_list_separator<char> > tok(s);
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for(tokenizer<escaped_list_separator<char> >::iterator beg=tok.begin(); beg!=tok.end();++beg){
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cout << *beg << "\n";
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}
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}
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</pre>
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<p> </p>
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<h2>Construction and Usage</h2>
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<p>escaped_list_separator has 2 constructors. They are as follows</p>
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<pre>
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explicit escaped_list_separator(Char e = '\\', Char c = ',',Char q = '\"')
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</pre>
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<table border="1" summary="">
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<tr>
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<td>
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<p align="center"><strong>Parameter</strong></p>
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</td>
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<td>
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<p align="center"><strong>Description</strong></p>
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</td>
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</tr>
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<tr>
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<td>e</td>
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<td>Specifies the character to use for escape sequences. It defaults to
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the C style \ (backslash). However you can override by passing in a
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different character. An example of when you might want to do this is
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when you have many fields which are Windows style filenames. Instead of
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escaping out each \ in the path, you can change the escape to something
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else.</td>
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</tr>
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<tr>
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<td>c</td>
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<td>Specifies the character to use to separate the fields</td>
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</tr>
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<tr>
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<td>q</td>
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<td>Specifies the character to use for the quote.</td>
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</tr>
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</table>
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<p> </p>
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<pre>
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escaped_list_separator(string_type e, string_type c, string_type q):
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</pre>
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<table border="1" summary="">
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<tr>
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<td>
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<p align="center"><strong>Parameter</strong></p>
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</td>
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<td>
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<p align="center"><strong>Description</strong></p>
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</td>
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</tr>
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<tr>
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<td>e</td>
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<td>Any character in the string e, is considered to be an escape
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character. If an empty string is given, then there are no escape
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characters.</td>
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</tr>
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<tr>
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<td>c</td>
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<td>Any character in the string c, is considered to be a separator. If
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an empty string is given, then there are no separator characters.</td>
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</tr>
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<tr>
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<td>q</td>
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<td>Any character in the string q, is considered to be a quote. If an
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empty string is given, then there are no quote characters.</td>
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</tr>
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</table>
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<p> </p>
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<p>To use this class, pass an object of it anywhere in the Tokenizer
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package where a TokenizerFunction is required.</p>
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<p> </p>
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<h2>Template Parameters</h2>
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<table border="1" summary="">
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<tr>
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<th><strong>Parameter</strong></th>
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<th><strong>Description</strong></th>
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</tr>
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<tr>
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<td><tt>Char</tt></td>
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<td>The type of the elements within a token, typically
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<tt>char</tt>.</td>
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</tr>
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<tr>
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<td>Traits</td>
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<td>The traits class for the Char type. This is used for comparing
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Char's. It defaults to std::char_traits<Char></td>
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</tr>
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</table>
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<p> </p>
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<h2>Model of</h2>
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<p><a href="tokenizerfunction.htm">TokenizerFunction</a></p>
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<p> </p>
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<hr>
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<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
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"../../doc/images/valid-html401.png" alt="Valid HTML 4.01 Transitional"
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height="31" width="88"></a></p>
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<p>Revised
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<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->25
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December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38518" --></p>
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<p><i>Copyright © 2001 John R. Bandela</i></p>
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<p><i>Distributed under the Boost Software License, Version 1.0. (See
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accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
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copy at <a href=
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"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
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</body>
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</html>
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