lr_parser.html

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<A NAME="done_parsing()"><!-- --></A><H3>
done_parsing</H3>
<PRE>
public void <B>done_parsing</B>()</PRE>
<DL>
<DD>This method is called to indicate that the parser should quit.  This is 
  normally called by an accept action, but can be used to cancel parsing 
  early in other circumstances if desired.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="setScanner(weka.core.parser.java_cup.runtime.Scanner)"><!-- --></A><H3>
setScanner</H3>
<PRE>
public void <B>setScanner</B>(<A HREF="../../../../../weka/core/parser/java_cup/runtime/Scanner.html" title="interface in weka.core.parser.java_cup.runtime">Scanner</A>&nbsp;s)</PRE>
<DL>
<DD>Simple accessor method to set the default scanner.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getScanner()"><!-- --></A><H3>
getScanner</H3>
<PRE>
public <A HREF="../../../../../weka/core/parser/java_cup/runtime/Scanner.html" title="interface in weka.core.parser.java_cup.runtime">Scanner</A> <B>getScanner</B>()</PRE>
<DL>
<DD>Simple accessor method to get the default scanner.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="do_action(int, weka.core.parser.java_cup.runtime.lr_parser, java.util.Stack, int)"><!-- --></A><H3>
do_action</H3>
<PRE>
public abstract <A HREF="../../../../../weka/core/parser/java_cup/runtime/Symbol.html" title="class in weka.core.parser.java_cup.runtime">Symbol</A> <B>do_action</B>(int&nbsp;act_num,
                                 <A HREF="../../../../../weka/core/parser/java_cup/runtime/lr_parser.html" title="class in weka.core.parser.java_cup.runtime">lr_parser</A>&nbsp;parser,
                                 java.util.Stack&nbsp;stack,
                                 int&nbsp;top)
                          throws java.lang.Exception</PRE>
<DL>
<DD>Perform a bit of user supplied action code (supplied by generated 
  subclass).  Actions are indexed by an internal action number assigned
  at parser generation time.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>act_num</CODE> - the internal index of the action to be performed.<DD><CODE>parser</CODE> - the parser object we are acting for.<DD><CODE>stack</CODE> - the parse stack of that object.<DD><CODE>top</CODE> - the index of the top element of the parse stack.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="user_init()"><!-- --></A><H3>
user_init</H3>
<PRE>
public void <B>user_init</B>()
               throws java.lang.Exception</PRE>
<DL>
<DD>User code for initialization inside the parser.  Typically this 
  initializes the scanner.  This is called before the parser requests
  the first Symbol.  Here this is just a placeholder for subclasses that 
  might need this and we perform no action.   This method is normally
  overridden by the generated code using this contents of the "init with"
  clause as its body.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="scan()"><!-- --></A><H3>
scan</H3>
<PRE>
public <A HREF="../../../../../weka/core/parser/java_cup/runtime/Symbol.html" title="class in weka.core.parser.java_cup.runtime">Symbol</A> <B>scan</B>()
            throws java.lang.Exception</PRE>
<DL>
<DD>Get the next Symbol from the input (supplied by generated subclass).
  Once end of file has been reached, all subsequent calls to scan 
  should return an EOF Symbol (which is Symbol number 0).  By default
  this method returns getScanner().next_token(); this implementation
  can be overriden by the generated parser using the code declared in
  the "scan with" clause.  Do not recycle objects; every call to
  scan() should return a fresh object.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="report_fatal_error(java.lang.String, java.lang.Object)"><!-- --></A><H3>
report_fatal_error</H3>
<PRE>
public void <B>report_fatal_error</B>(java.lang.String&nbsp;message,
                               java.lang.Object&nbsp;info)
                        throws java.lang.Exception</PRE>
<DL>
<DD>Report a fatal error.  This method takes a  message string and an 
  additional object (to be used by specializations implemented in 
  subclasses).  Here in the base class a very simple implementation 
  is provided which reports the error then throws an exception.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>message</CODE> - an error message.<DD><CODE>info</CODE> - an extra object reserved for use by specialized subclasses.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="report_error(java.lang.String, java.lang.Object)"><!-- --></A><H3>
report_error</H3>
<PRE>
public void <B>report_error</B>(java.lang.String&nbsp;message,
                         java.lang.Object&nbsp;info)</PRE>
<DL>
<DD>Report a non fatal error (or warning).  This method takes a message 
  string and an additional object (to be used by specializations 
  implemented in subclasses).  Here in the base class a very simple 
  implementation is provided which simply prints the message to 
  System.err.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>message</CODE> - an error message.<DD><CODE>info</CODE> - an extra object reserved for use by specialized subclasses.</DL>
</DD>
</DL>
<HR>

<A NAME="syntax_error(weka.core.parser.java_cup.runtime.Symbol)"><!-- --></A><H3>
syntax_error</H3>
<PRE>
public void <B>syntax_error</B>(<A HREF="../../../../../weka/core/parser/java_cup/runtime/Symbol.html" title="class in weka.core.parser.java_cup.runtime">Symbol</A>&nbsp;cur_token)</PRE>
<DL>
<DD>This method is called when a syntax error has been detected and recovery 
  is about to be invoked.  Here in the base class we just emit a 
  "Syntax error" error message.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>cur_token</CODE> - the current lookahead Symbol.</DL>
</DD>
</DL>
<HR>

<A NAME="unrecovered_syntax_error(weka.core.parser.java_cup.runtime.Symbol)"><!-- --></A><H3>
unrecovered_syntax_error</H3>
<PRE>
public void <B>unrecovered_syntax_error</B>(<A HREF="../../../../../weka/core/parser/java_cup/runtime/Symbol.html" title="class in weka.core.parser.java_cup.runtime">Symbol</A>&nbsp;cur_token)
                              throws java.lang.Exception</PRE>
<DL>
<DD>This method is called if it is determined that syntax error recovery 
  has been unsuccessful.  Here in the base class we report a fatal error.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>cur_token</CODE> - the current lookahead Symbol.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="parse()"><!-- --></A><H3>
parse</H3>
<PRE>
public <A HREF="../../../../../weka/core/parser/java_cup/runtime/Symbol.html" title="class in weka.core.parser.java_cup.runtime">Symbol</A> <B>parse</B>()
             throws java.lang.Exception</PRE>
<DL>
<DD>This method provides the main parsing routine.  It returns only when 
  done_parsing() has been called (typically because the parser has 
  accepted, or a fatal error has been reported).  See the header 
  documentation for the class regarding how shift/reduce parsers operate
  and how the various tables are used.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="debug_message(java.lang.String)"><!-- --></A><H3>
debug_message</H3>
<PRE>
public void <B>debug_message</B>(java.lang.String&nbsp;mess)</PRE>
<DL>
<DD>Write a debugging message to System.err for the debugging version 
  of the parser.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>mess</CODE> - the text of the debugging message.</DL>
</DD>
</DL>
<HR>

<A NAME="dump_stack()"><!-- --></A><H3>
dump_stack</H3>
<PRE>
public void <B>dump_stack</B>()</PRE>
<DL>
<DD>Dump the parse stack for debugging purposes.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="debug_reduce(int, int, int)"><!-- --></A><H3>
debug_reduce</H3>
<PRE>
public void <B>debug_reduce</B>(int&nbsp;prod_num,
                         int&nbsp;nt_num,
                         int&nbsp;rhs_size)</PRE>
<DL>
<DD>Do debug output for a reduce.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>prod_num</CODE> - the production we are reducing with.<DD><CODE>nt_num</CODE> - the index of the LHS non terminal.<DD><CODE>rhs_size</CODE> - the size of the RHS.</DL>
</DD>
</DL>
<HR>

<A NAME="debug_shift(weka.core.parser.java_cup.runtime.Symbol)"><!-- --></A><H3>
debug_shift</H3>
<PRE>
public void <B>debug_shift</B>(<A HREF="../../../../../weka/core/parser/java_cup/runtime/Symbol.html" title="class in weka.core.parser.java_cup.runtime">Symbol</A>&nbsp;shift_tkn)</PRE>
<DL>
<DD>Do debug output for shift.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>shift_tkn</CODE> - the Symbol being shifted onto the stack.</DL>
</DD>
</DL>
<HR>

<A NAME="debug_stack()"><!-- --></A><H3>
debug_stack</H3>
<PRE>
public void <B>debug_stack</B>()</PRE>
<DL>
<DD>Do debug output for stack state. [CSA]
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="debug_parse()"><!-- --></A><H3>
debug_parse</H3>
<PRE>
public <A HREF="../../../../../weka/core/parser/java_cup/runtime/Symbol.html" title="class in weka.core.parser.java_cup.runtime">Symbol</A> <B>debug_parse</B>()
                   throws java.lang.Exception</PRE>
<DL>
<DD>Perform a parse with debugging output.  This does exactly the
  same things as parse(), except that it calls debug_shift() and
  debug_reduce() when shift and reduce moves are taken by the parser
  and produces various other debugging messages.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE></DL>
</DD>
</DL>
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