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<?xml version="1.0" encoding="latin1" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">
<erlref>
<header>
<copyright>
<year>2001</year><year>2011</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
The contents of this file are subject to the Erlang Public License,
Version 1.1, (the "License"); you may not use this file except in
compliance with the License. You should have received a copy of the
Erlang Public License along with this software. If not, it can be
retrieved online at http://www.erlang.org/.
Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
the License for the specific language governing rights and limitations
under the License.
</legalnotice>
<title>megaco_flex_scanner</title>
<prepared>Micael Karlberg</prepared>
<responsible>Micael Karlberg</responsible>
<docno></docno>
<approved>Micael Karlberg</approved>
<checked></checked>
<date>2009-05-04</date>
<rev>%VSN%</rev>
<file>megaco_flex_scanner.xml</file>
</header>
<module>megaco_flex_scanner</module>
<modulesummary>Interface module to the flex scanner linked in driver.</modulesummary>
<description>
<p>This module contains the public interface to the flex scanner
linked in driver. The flex scanner performs the scanning phase
of text message decoding.</p>
<p>The flex scanner is written using a tool called <em>flex</em>.
In order to be able to compile the flex scanner driver, this
tool has to be available. </p>
<p>By default the flex scanner reports line-number of an error.
But it can be built without line-number reporting. Instead
token number is used. This will speed up the scanning some
5-10%. Use <c><![CDATA[--disable-megaco-flex-scanner-lineno]]></c> when
configuring the application.</p>
<p>The scanner will, by default, be built as a reentrant scanner <em>if</em> the
flex utility supports this (it depends on the version of flex).
It is possible to explicitly disable this even when flex support this.
Use <c><![CDATA[--disable-megaco-reentrant-flex-scanner]]></c> when
configuring the application.</p>
</description>
<section>
<title>DATA TYPES</title>
<code type="none"><![CDATA[
megaco_ports() = term()
megaco_version() = integer() >= 1
]]></code>
<marker id="start"></marker>
</section>
<funcs>
<func>
<name>start() -> {ok, PortOrPorts} | {error, Reason}</name>
<fsummary></fsummary>
<type>
<v>PortOrPorts = megaco_ports()</v>
<v>Reason = term()</v>
</type>
<desc>
<p>This function is used to start the flex scanner.
It locates the library and loads the linked in driver.</p>
<p>On a single core system or if it's a non-reentrant scanner,
a single port is created. On a multi-core system with a reentrant
scanner, several ports will be created (one for each scheduler). </p>
<p>Note that the process that calls this function <em>must</em>
be permanent. If it dies, the port(s) will exit and the driver unload.</p>
<marker id="stop"></marker>
</desc>
</func>
<func>
<name>stop(PortOrPorts) -> stopped</name>
<fsummary></fsummary>
<type>
<v>PortOrPorts = megaco_ports()</v>
</type>
<desc>
<p>This function is used to stop the flex scanner. It also
unloads the driver.</p>
<marker id="is_reentrant_enabled"></marker>
</desc>
</func>
<func>
<name>is_reentrant_enabled() -> Boolean</name>
<fsummary></fsummary>
<type>
<v>Boolean = boolean()</v>
</type>
<desc>
<p>Is the flex scanner reentrant or not.</p>
<marker id="is_scanner_port"></marker>
</desc>
</func>
<func>
<name>is_scanner_port(Port, PortOrPorts) -> Boolean</name>
<fsummary></fsummary>
<type>
<v>Port = port()</v>
<v>PortOrPorts = megaco_ports()</v>
<v>Boolean = boolean()</v>
</type>
<desc>
<p>Checks if a port is a flex scanner port or not (useful when
if a port exits). </p>
<marker id="scan"></marker>
</desc>
</func>
<func>
<name>scan(Binary, PortOrPorts) -> {ok, Tokens, Version, LatestLine} | {error, Reason, LatestLine} </name>
<fsummary></fsummary>
<type>
<v>Binary = binary()</v>
<v>PortOrPorts = megaco_ports()</v>
<v>Tokens = list()</v>
<v>Version = megaco_version()</v>
<v>LatestLine = integer()</v>
<v>Reason = term()</v>
</type>
<desc>
<p>Scans a megaco message and generates a token list to be passed on the parser. </p>
</desc>
</func>
</funcs>
</erlref>
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