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Doc update from Sqlite 

svn path=/trunk/; revision=17707
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Anders Broman 2006-03-23 17:01:51 +00:00
parent f2de697f7d
commit 699146b353
1 changed files with 36 additions and 3 deletions
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@ -515,6 +515,9 @@ other than that, the order of directives in Lemon is arbitrary.</p>
<p>Lemon supports the following special directives:
<ul>
<li><tt>%code</tt>
<li><tt>%default_destructor</tt>
<li><tt>%default_type</tt>
<li><tt>%destructor</tt>
<li><tt>%extra_argument</tt>
<li><tt>%include</tt>
@ -536,6 +539,35 @@ other than that, the order of directives in Lemon is arbitrary.</p>
Each of these directives will be described separately in the
following sections:</p>
<h4>The <tt>%code</tt> directive</h4>
<p>The %code directive is used to specify addition C/C++ code that
is added to the end of the main output file. This is similar to
the %include directive except that %include is inserted at the
beginning of the main output file.</p>
<p>%code is typically used to include some action routines or perhaps
a tokenizer as part of the output file.</p>
<h4>The <tt>%default_destructor</tt> directive</h4>
<p>The %default_destructor directive specifies a destructor to
use for non-terminals that do not have their own destructor
specified by a separate %destructor directive. See the documentation
on the %destructor directive below for additional information.</p>
<p>In some grammers, many different non-terminal symbols have the
same datatype and hence the same destructor. This directive is
a convenience way to specify the same destructor for all those
non-terminals using a single statement.</p>
<h4>The <tt>%default_type</tt> directive</h4>
<p>The %default_type directive specifies the datatype of non-terminal
symbols that do no have their own datatype defined using a separate
%type directive. See the documentation on %type below for addition
information.</p>
<h4>The <tt>%destructor</tt> directive</h4>
<p>The %destructor directive is used to specify a destructor for
@ -607,9 +639,9 @@ in the most recent call to Parse().</p>
<p>The %include directive specifies C code that is included at the
top of the generated parser. You can include any text you want --
the Lemon parser generator copies to blindly. If you have multiple
%include directives in your grammar file, their values are concatenated
before being put at the beginning of the generated parser.</p>
the Lemon parser generator copies it blindly. If you have multiple
%include directives in your grammar file the value of the last
%include directive overwrites all the others.</p.
<p>The %include directive is very handy for getting some extra #include
preprocessor statements at the beginning of the generated parser.
@ -859,3 +891,4 @@ first syntax error, of course, if there are no instances of the
</body>
</html>