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<title>Geyacc: Parser Skeleton</title>
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<td><font size="6"><strong>Parser Skeleton</strong></font></td>
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<pre><em><strong>indexing</strong></em>
description: "General parsers"
library: "Gobo Eiffel Parse Library"
author: "Eric Bezault <ericb@gobosoft.com>"
copyright: "Copyright (c) 1997, Eric Bezault"
<em><strong>deferred class</strong></em> <em>YY_PARSER</em> [<em>G</em>]
<em><strong>creation</strong></em>
<a href="parser.html#make" name="make"><em>make</em></a>
-- Create a new parser.
<em><strong>feature</strong></em> -- Parsing
<a href="parser.html#parse" name="parse"><em>parse</em></a>
-- Parse input stream.
-- Set <em>syntax_error</em> to True if
-- parsing has not been successful.
<em><strong>feature</strong></em> -- Status report
<a href="parser.html#syntax_error" name="syntax_error"><em>syntax_error</em></a>: <em>BOOLEAN</em>
-- Has last parsing been unsuccesful?
<em><strong>feature</strong></em> -- Access
<a href="actions.html#error_count" name="error_count"><em>error_count</em></a>: <em>INTEGER</em>
-- Number of errors detected during last parsing
-- (<em>error_count</em> can be non-zero even though
-- <em>syntax_error</em> is false. This can happen when
-- error recovery occurred.)
<em><strong>ensure</strong></em>
<em>error_count_non_negative</em>: <em>Result</em> >= <em>0</em>
</pre>
<pre><em><strong>feature</strong></em> -- Element change
<a href="actions.html#clear_all" name="clear_all"><em>clear_all</em></a>
-- Clear temporary objects so that they can be collected
-- by the garbage collector. (This routine is called by
-- <em>parse</em> before exiting. It can be redefined in descendants.)
<em><strong>feature</strong></em> {<em>YY_PARSER_ACTION</em>} -- Status report
<a href="actions.html#is_recovering" name="is_recovering"><em>is_recovering</em></a>: <em>BOOLEAN</em>
-- Is current parser recovering from a syntax error?
<em><strong>feature</strong></em> {<em>YY_PARSER_ACTION</em>} -- Basic operations
<a href="actions.html#accept" name="accept"><em>accept</em></a>
-- Stop parsing successfully.
<em><strong>ensure</strong></em>
<em>accepted</em>: <em><strong>not</strong></em> <em>syntax_error</em>
<a href="actions.html#abort" name="abort"><em>abort</em></a>
-- Abort parsing.
-- Do not print error message.
<em><strong>ensure</strong></em>
<em>aborted</em>: <em>syntax_error</em>
<a href="actions.html#raise_error" name="raise_error"><em>raise_error</em></a>
-- Raise a syntax error.
-- Report error using <em>report_error</em> and
-- perform normal error recovery if possible.
<a href="actions.html#recover" name="recover"><em>recover</em></a>
-- Recover immediately after a parse error.
<a href="actions.html#report_error" name="report_error"><em>report_error</em></a> (<em>a_message</em>: <em>STRING</em>)
-- Print error message.
-- (This routine is called by <em>parse</em> when it detects
-- a syntax error. It can be redefined in descendants.)
<em><strong>require</strong></em>
<em>a_message_not_void</em>: <em>a_message</em> /= <em>Void</em>
<a href="actions.html#clear_token" name="clear_token"><em>clear_token</em></a>
-- Clear the previous lookahead token.
-- Used in error-recovery rule actions.
<em><strong>feature</strong></em> {<em>YY_PARSER_ACTION</em>} -- Scanning
<a href="actions.html#read_token" name="read_token"><em>read_token</em></a>
-- Read a token from input stream.
-- Make result available in <em>last_token</em>.
-- (This routine is called by <em>parse</em> when it needs a
-- new token from the input stream.)
<a href="actions.html#last_token" name="last_token"><em>last_token</em></a>: <em>INTEGER</em>
-- Last token read
<a href="actions.html#last_value" name="last_value"><em>last_value</em></a>: <em>G</em>
-- Semantic value of last token read
<em><strong>end</strong></em> -- class YY_PARSER</pre>
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<td><address>
<font size="2"><b>Copyright 1999</b></font><font
size="1"><b>, </b></font><font size="2"><strong>Eric
Bezault</strong></font><strong> </strong><font
size="2"><br>
<strong>mailto:</strong></font><a
href="mailto://www.gobosoft.com"><font size="2">ericb@gobosoft.com</font></a><font
size="2"><br>
<strong>http:</strong></font><a
href="http://www.gobosoft.com"><font size="2">//www.gobosoft.com</font></a><font
size="2"><br>
<strong>Last Updated:</strong> 19 March 1999</font><br>
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$Date: 1999/06/12 18:57:33 $
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