text::parsewords.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "Text::ParseWords 3"
.TH Text::ParseWords 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Text::ParseWords \- parse text into an array of tokens or array of arrays
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 6
\&  use Text::ParseWords;
\&  @lists = &nested_quotewords($delim, $keep, @lines);
\&  @words = &quotewords($delim, $keep, @lines);
\&  @words = &shellwords(@lines);
\&  @words = &parse_line($delim, $keep, $line);
\&  @words = &old_shellwords(@lines); # DEPRECATED!
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The &\fInested_quotewords()\fR and &\fIquotewords()\fR functions accept a delimiter 
(which can be a regular expression)
and a list of lines and then breaks those lines up into a list of
words ignoring delimiters that appear inside quotes.  &\fIquotewords()\fR
returns all of the tokens in a single long list, while &\fInested_quotewords()\fR
returns a list of token lists corresponding to the elements of \f(CW@lines\fR.
&\fIparse_line()\fR does tokenizing on a single string.  The &*\fIquotewords()\fR
functions simply call &\fIparse_line()\fR, so if you're only splitting
one line you can call &\fIparse_line()\fR directly and save a function
call.
.PP
The \f(CW$keep\fR argument is a boolean flag.  If true, then the tokens are
split on the specified delimiter, but all other characters (quotes,
backslashes, etc.) are kept in the tokens.  If \f(CW$keep\fR is false then the
&*\fIquotewords()\fR functions remove all quotes and backslashes that are
not themselves backslash-escaped or inside of single quotes (i.e.,
&\fIquotewords()\fR tries to interpret these characters just like the Bourne
shell).  \s-1NB:\s0 these semantics are significantly different from the
original version of this module shipped with Perl 5.000 through 5.004.
As an additional feature, \f(CW$keep\fR may be the keyword \*(L"delimiters\*(R" which
causes the functions to preserve the delimiters in each string as
tokens in the token lists, in addition to preserving quote and
backslash characters.
.PP
&\fIshellwords()\fR is written as a special case of &\fIquotewords()\fR, and it
does token parsing with whitespace as a delimiter\*(-- similar to most
Unix shells.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
The sample program:
.PP
.Vb 7
\&  use Text::ParseWords;
\&  @words = &quotewords(\*(Aq\es+\*(Aq, 0, q{this   is "a test" of\e quotewords \e"for you});
\&  $i = 0;
\&  foreach (@words) {
\&      print "$i: <$_>\en";
\&      $i++;
\&  }
.Ve
.PP
produces:
.PP
.Vb 6
\&  0: <this>
\&  1: <is>
\&  2: <a test>
\&  3: <of quotewords>
\&  4: <"for>
\&  5: <you>
.Ve
.PP
demonstrating:
.IP "0" 4
a simple word
.IP "1" 4
.IX Item "1"
multiple spaces are skipped because of our \f(CW$delim\fR
.IP "2" 4
.IX Item "2"
use of quotes to include a space in a word
.IP "3" 4
.IX Item "3"
use of a backslash to include a space in a word
.IP "4" 4
.IX Item "4"
use of a backslash to remove the special meaning of a double-quote
.IP "5" 4
.IX Item "5"
another simple word (note the lack of effect of the
backslashed double-quote)
.PP
Replacing \f(CW\*(C`&quotewords(\*(Aq\es+\*(Aq, 0, q{this   is...})\*(C'\fR
with \f(CW\*(C`&shellwords(q{this   is...})\*(C'\fR
is a simpler way to accomplish the same thing.
.SH "AUTHORS"
.IX Header "AUTHORS"
Maintainer is Hal Pomeranz <[e-mail]>, 1994\-1997 (Original
author unknown).  Much of the code for &\fIparse_line()\fR (including the
primary regexp) from Joerk Behrends <[e-mail]>.
.PP
Examples section another documentation provided by John Heidemann 
<[e-mail]>
.PP
Bug reports, patches, and nagging provided by lots of folks\*(-- thanks
everybody!  Special thanks to Michael Schwern <[e-mail]>
for assuring me that a &\fInested_quotewords()\fR would be useful, and to 
Jeff Friedl <jfriedl@yahoo\-inc.com> for telling me not to worry about
error-checking (sort of\*(-- you had to be there).