lalr_item.html

数据挖掘的最常用工具。由于开源

</TABLE>

<A NAME="lalr_item(weka.core.parser.java_cup.production, int, weka.core.parser.java_cup.terminal_set)"><!-- --></A><H3>
lalr_item</H3>
<PRE>
public <B>lalr_item</B>(<A HREF="../../../../weka/core/parser/java_cup/production.html" title="class in weka.core.parser.java_cup">production</A>&nbsp;prod,
                 int&nbsp;pos,
                 <A HREF="../../../../weka/core/parser/java_cup/terminal_set.html" title="class in weka.core.parser.java_cup">terminal_set</A>&nbsp;look)
          throws <A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></PRE>
<DL>
<DD>Full constructor.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>prod</CODE> - the production for the item.<DD><CODE>pos</CODE> - the position of the "dot" within the production.<DD><CODE>look</CODE> - the set of lookahead symbols.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></CODE></DL>
</DL>
<HR>

<A NAME="lalr_item(weka.core.parser.java_cup.production, weka.core.parser.java_cup.terminal_set)"><!-- --></A><H3>
lalr_item</H3>
<PRE>
public <B>lalr_item</B>(<A HREF="../../../../weka/core/parser/java_cup/production.html" title="class in weka.core.parser.java_cup">production</A>&nbsp;prod,
                 <A HREF="../../../../weka/core/parser/java_cup/terminal_set.html" title="class in weka.core.parser.java_cup">terminal_set</A>&nbsp;look)
          throws <A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></PRE>
<DL>
<DD>Constructor with default position (dot at start).
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>prod</CODE> - the production for the item.<DD><CODE>look</CODE> - the set of lookahead symbols.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></CODE></DL>
</DL>
<HR>

<A NAME="lalr_item(weka.core.parser.java_cup.production)"><!-- --></A><H3>
lalr_item</H3>
<PRE>
public <B>lalr_item</B>(<A HREF="../../../../weka/core/parser/java_cup/production.html" title="class in weka.core.parser.java_cup">production</A>&nbsp;prod)
          throws <A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></PRE>
<DL>
<DD>Constructor with default position and empty lookahead set.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>prod</CODE> - the production for the item.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></CODE></DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
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</TABLE>

<A NAME="lookahead()"><!-- --></A><H3>
lookahead</H3>
<PRE>
public <A HREF="../../../../weka/core/parser/java_cup/terminal_set.html" title="class in weka.core.parser.java_cup">terminal_set</A> <B>lookahead</B>()</PRE>
<DL>
<DD>The lookahead symbols of the item.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="propagate_items()"><!-- --></A><H3>
propagate_items</H3>
<PRE>
public java.util.Stack <B>propagate_items</B>()</PRE>
<DL>
<DD>Links to items that the lookahead needs to be propagated to
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="add_propagate(weka.core.parser.java_cup.lalr_item)"><!-- --></A><H3>
add_propagate</H3>
<PRE>
public void <B>add_propagate</B>(<A HREF="../../../../weka/core/parser/java_cup/lalr_item.html" title="class in weka.core.parser.java_cup">lalr_item</A>&nbsp;prop_to)</PRE>
<DL>
<DD>Add a new item to the set of items we propagate to.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="propagate_lookaheads(weka.core.parser.java_cup.terminal_set)"><!-- --></A><H3>
propagate_lookaheads</H3>
<PRE>
public void <B>propagate_lookaheads</B>(<A HREF="../../../../weka/core/parser/java_cup/terminal_set.html" title="class in weka.core.parser.java_cup">terminal_set</A>&nbsp;incoming)
                          throws <A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></PRE>
<DL>
<DD>Propagate incoming lookaheads through this item to others need to 
  be changed.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="shift()"><!-- --></A><H3>
shift</H3>
<PRE>
public <A HREF="../../../../weka/core/parser/java_cup/lalr_item.html" title="class in weka.core.parser.java_cup">lalr_item</A> <B>shift</B>()
                throws <A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></PRE>
<DL>
<DD>Produce the new lalr_item that results from shifting the dot one position
  to the right.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="calc_lookahead(weka.core.parser.java_cup.terminal_set)"><!-- --></A><H3>
calc_lookahead</H3>
<PRE>
public <A HREF="../../../../weka/core/parser/java_cup/terminal_set.html" title="class in weka.core.parser.java_cup">terminal_set</A> <B>calc_lookahead</B>(<A HREF="../../../../weka/core/parser/java_cup/terminal_set.html" title="class in weka.core.parser.java_cup">terminal_set</A>&nbsp;lookahead_after)
                            throws <A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></PRE>
<DL>
<DD>Calculate lookahead representing symbols that could appear after the
   symbol that the dot is currently in front of.  Note: this routine must
   not be invoked before first sets and nullability has been calculated
   for all non terminals.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="lookahead_visible()"><!-- --></A><H3>
lookahead_visible</H3>
<PRE>
public boolean <B>lookahead_visible</B>()
                          throws <A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></PRE>
<DL>
<DD>Determine if everything from the symbol one beyond the dot all the 
  way to the  end of the right hand side is nullable.  This would indicate
  that the lookahead of this item must be included in the lookaheads of
  all items produced as a closure of this item.  Note: this routine should 
  not be invoked until after first sets and nullability have been 
  calculated for all non terminals.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../weka/core/parser/java_cup/internal_error.html" title="class in weka.core.parser.java_cup">internal_error</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="equals(weka.core.parser.java_cup.lalr_item)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(<A HREF="../../../../weka/core/parser/java_cup/lalr_item.html" title="class in weka.core.parser.java_cup">lalr_item</A>&nbsp;other)</PRE>
<DL>
<DD>Equality comparison -- here we only require the cores to be equal since
   we need to do sets of items based only on core equality (ignoring 
   lookahead sets).
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(java.lang.Object&nbsp;other)</PRE>
<DL>
<DD>Generic equality comparison.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../weka/core/parser/java_cup/lr_item_core.html#equals(java.lang.Object)">equals</A></CODE> in class <CODE><A HREF="../../../../weka/core/parser/java_cup/lr_item_core.html" title="class in weka.core.parser.java_cup">lr_item_core</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Return a hash code -- here we only hash the core since we only test core
  matching in LALR items.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../weka/core/parser/java_cup/lr_item_core.html#hashCode()">hashCode</A></CODE> in class <CODE><A HREF="../../../../weka/core/parser/java_cup/lr_item_core.html" title="class in weka.core.parser.java_cup">lr_item_core</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Convert to string.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../weka/core/parser/java_cup/lr_item_core.html#toString()">toString</A></CODE> in class <CODE><A HREF="../../../../weka/core/parser/java_cup/lr_item_core.html" title="class in weka.core.parser.java_cup">lr_item_core</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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