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431 lines
11 KiB
HTML
431 lines
11 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta name="description" content="LuaSocket: LTN12 support">
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<meta name="keywords" content="Lua, LuaSocket, Filters, Source, Sink,
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Pump, Support, Library">
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<title>LuaSocket: LTN12 module</title>
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<link rel="stylesheet" href="reference.css" type="text/css">
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</head>
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<body>
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<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<div class=header>
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<hr>
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<center>
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<table summary="LuaSocket logo">
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<tr><td align=center><a href="http://www.lua.org">
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<img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png">
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</a></td></tr>
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<tr><td align=center valign=top>Network support for the Lua language
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</td></tr>
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</table>
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<p class=bar>
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<a href="home.html">home</a> ·
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<a href="home.html#download">download</a> ·
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<a href="installation.html">installation</a> ·
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<a href="introduction.html">introduction</a> ·
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<a href="reference.html">reference</a>
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</p>
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</center>
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<hr>
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</div>
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<!-- ltn12 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h2 id=ltn12>LTN12</h2>
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<p> The <tt>ltn12</tt> namespace implements the ideas described in
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">
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LTN012, Filters sources and sinks</a>. This manual simply describes the
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functions. Please refer to the LTN for a deeper explanation of the
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functionality provided by this module.
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</p>
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<p>
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To obtain the <tt>ltn12</tt> namespace, run:
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</p>
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<pre class=example>
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-- loads the LTN21 module
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local ltn12 = require("ltn12")
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</pre>
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<!-- filters ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h3 id="filter">Filters</h3>
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<!-- chain ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="filter.chain">
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ltn12.filter.<b>chain(</b>filter<sub>1</sub>, filter<sub>2</sub>
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[, ... filter<sub>N</sub>]<b>)</b>
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</p>
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<p class=description>
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Returns a filter that passes all data it receives through each of a
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series of given filters.
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</p>
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<p class=parameters>
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<tt>Filter<sub>1</sub></tt> to <tt>filter<sub>N</sub></tt> are simple
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filters.
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</p>
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<p class=return>
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The function returns the chained filter.
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</p>
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<p class=note>
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The nesting of filters can be arbitrary. For instance, the useless filter
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below doesn't do anything but return the data that was passed to it,
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unaltered.
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</p>
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<pre class=example>
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-- load required modules
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local ltn12 = require("ltn12")
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local mime = require("mime")
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-- create a silly identity filter
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id = ltn12.filter.chain(
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mime.encode("quoted-printable"),
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mime.encode("base64"),
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mime.decode("base64"),
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mime.decode("quoted-printable")
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)
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</pre>
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<!-- cycle ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="filter.cycle">
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ltn12.filter.<b>cycle(</b>low [, ctx, extra]<b>)</b>
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</p>
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<p class=description>
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Returns a high-level filter that cycles though a low-level filter by
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passing it each chunk and updating a context between calls.
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</p>
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<p class=parameters>
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<tt>Low</tt> is the low-level filter to be cycled,
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<tt>ctx</tt> is the initial context and <tt>extra</tt> is any extra
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argument the low-level filter might take.
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</p>
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<p class=return>
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The function returns the high-level filter.
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</p>
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<pre class=example>
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-- load the ltn12 module
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local ltn12 = require("ltn12")
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-- the base64 mime filter factory
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encodet['base64'] = function()
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return ltn12.filter.cycle(b64, "")
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end
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</pre>
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<!-- pumps ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h3 id="pump">Pumps</h3>
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<!-- all ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="pump.all">
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ltn12.pump.<b>all(</b>source, sink<b>)</b>
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</p>
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<p class=description>
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Pumps <em>all</em> data from a <tt>source</tt> to a <tt>sink</tt>.
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</p>
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<p class=return>
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If successful, the function returns a value that evaluates to
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<b><tt>true</tt></b>. In case
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of error, the function returns a <b><tt>false</tt></b> value, followed by an error message.
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</p>
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<!-- step +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="pump.step">
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ltn12.pump.<b>step(</b>source, sink<b>)</b>
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</p>
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<p class=description>
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Pumps <em>one</em> chunk of data from a <tt>source</tt> to a <tt>sink</tt>.
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</p>
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<p class=return>
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If successful, the function returns a value that evaluates to
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<b><tt>true</tt></b>. In case
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of error, the function returns a <b><tt>false</tt></b> value, followed by an error message.
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</p>
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<!-- sinks ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h3 id="sink">Sinks</h3>
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<!-- chain ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="sink.chain">
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ltn12.sink.<b>chain(</b>filter, sink<b>)</b>
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</p>
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<p class=description>
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Creates and returns a new sink that passes data through a <tt>filter</tt> before sending it to a given <tt>sink</tt>.
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</p>
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<!-- error ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="sink.error">
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ltn12.sink.<b>error(</b>message<b>)</b>
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</p>
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<p class=description>
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Creates and returns a sink that aborts transmission with the error
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<tt>message</tt>.
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</p>
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<!-- file +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="sink.file">
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ltn12.sink.<b>file(</b>handle, message<b>)</b>
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</p>
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<p class=description>
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Creates a sink that sends data to a file.
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</p>
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<p class=parameters>
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<tt>Handle</tt> is a file handle. If <tt>handle</tt> is <tt><b>nil</b></tt>,
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<tt>message</tt> should give the reason for failure.
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</p>
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<p class=return>
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The function returns a sink that sends all data to the given <tt>handle</tt>
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and closes the file when done, or a sink that aborts the transmission with
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the error <tt>message</tt>
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</p>
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<p class=note>
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In the following example, notice how the prototype is designed to
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fit nicely with the <tt>io.open</tt> function.
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</p>
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<pre class=example>
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-- load the ltn12 module
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local ltn12 = require("ltn12")
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-- copy a file
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ltn12.pump.all(
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ltn12.source.file(io.open("original.png")),
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ltn12.sink.file(io.open("copy.png"))
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)
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</pre>
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<!-- null +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="sink.null">
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ltn12.sink.<b>null()</b>
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</p>
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<p class=description>
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Returns a sink that ignores all data it receives.
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</p>
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<!-- simplify +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="sink.simplify">
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ltn12.sink.<b>simplify(</b>sink<b>)</b>
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</p>
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<p class=description>
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Creates and returns a simple sink given a fancy <tt>sink</tt>.
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</p>
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<!-- table ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="sink.table">
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ltn12.sink.<b>table(</b>[table]<b>)</b>
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</p>
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<p class=description>
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Creates a sink that stores all chunks in a table. The chunks can later be
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efficiently concatenated into a single string.
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</p>
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<p class=parameters>
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<tt>Table</tt> is used to hold the chunks. If
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<tt><b>nil</b></tt>, the function creates its own table.
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</p>
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<p class=return>
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The function returns the sink and the table used to store the chunks.
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</p>
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<pre class=example>
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-- load needed modules
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local http = require("socket.http")
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local ltn12 = require("ltn12")
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-- a simplified http.get function
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function http.get(u)
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local t = {}
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local respt = request{
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url = u,
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sink = ltn12.sink.table(t)
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}
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return table.concat(t), respt.headers, respt.code
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end
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</pre>
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<!-- sinks ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h3 id="source">Sources</h3>
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<!-- cat ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="source.cat">
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ltn12.source.<b>cat(</b>source<sub>1</sub> [, source<sub>2</sub>, ...,
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source<sub>N</sub>]<b>)</b>
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</p>
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<p class=description>
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Creates a new source that produces the concatenation of the data produced
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by a number of sources.
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</p>
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<p class=parameters>
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<tt>Source<sub>1</sub></tt> to <tt>source<sub>N</sub></tt> are the original
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sources.
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</p>
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<p class=return>
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The function returns the new source.
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</p>
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<!-- chain ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="source.chain">
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ltn12.source.<b>chain(</b>source, filter<b>)</b>
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</p>
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<p class=description>
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Creates a new <tt>source</tt> that passes data through a <tt>filter</tt>
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before returning it.
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</p>
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<p class=return>
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The function returns the new source.
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</p>
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<!-- empty ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="source.empty">
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ltn12.source.<b>empty()</b>
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</p>
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<p class=description>
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Creates and returns an empty source.
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</p>
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<!-- error ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="source.error">
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ltn12.source.<b>error(</b>message<b>)</b>
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</p>
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<p class=description>
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Creates and returns a source that aborts transmission with the error
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<tt>message</tt>.
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</p>
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<!-- file +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="source.file">
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ltn12.source.<b>file(</b>handle, message<b>)</b>
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</p>
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<p class=description>
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Creates a source that produces the contents of a file.
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</p>
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<p class=parameters>
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<tt>Handle</tt> is a file handle. If <tt>handle</tt> is <tt><b>nil</b></tt>,
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<tt>message</tt> should give the reason for failure.
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</p>
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<p class=return>
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The function returns a source that reads chunks of data from
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given <tt>handle</tt> and returns it to the user,
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closing the file when done, or a source that aborts the transmission with
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the error <tt>message</tt>
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</p>
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<p class=note>
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In the following example, notice how the prototype is designed to
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fit nicely with the <tt>io.open</tt> function.
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</p>
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<pre class=example>
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-- load the ltn12 module
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local ltn12 = require("ltn12")
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-- copy a file
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ltn12.pump.all(
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ltn12.source.file(io.open("original.png")),
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ltn12.sink.file(io.open("copy.png"))
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)
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</pre>
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<!-- simplify +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="source.simplify">
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ltn12.source.<b>simplify(</b>source<b>)</b>
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</p>
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<p class=description>
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Creates and returns a simple source given a fancy <tt>source</tt>.
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</p>
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<!-- string +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id="source.string">
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ltn12.source.<b>string(</b>string<b>)</b>
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</p>
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<p class=description>
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Creates and returns a source that produces the contents of a
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<tt>string</tt>, chunk by chunk.
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</p>
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<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<div class=footer>
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<hr>
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<center>
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<p class=bar>
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<a href="home.html">home</a> ·
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<a href="home.html#down">download</a> ·
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<a href="installation.html">installation</a> ·
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<a href="introduction.html">introduction</a> ·
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<a href="reference.html">reference</a>
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</p>
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<p>
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<small>
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Last modified by Diego Nehab on <br>
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Mon Nov 21 01:57:47 EST 2005
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</small>
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</p>
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</center>
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</div>
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</body>
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</html>
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