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Table
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Class Table</H2>
<PRE>
java.lang.Object
<IMG SRC="./resources/inherit.gif" ALT="extended by "><B>Table</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>Table</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
这个类封装了PL/0编译器的符号表，C语言版本中关键的全局变量tx和table[]就在这里。
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<CODE> class</CODE></FONT></TD>
<TD><CODE><B><A HREF="Table.Item.html" title="class in <Unnamed>">Table.Item</A></B></CODE>
<BR>
即C语言版本中的tablestruct结构。</TD>
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<CODE>private <A HREF="Table.Item.html" title="class in <Unnamed>">Table.Item</A>[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="Table.html#table">table</A></B></CODE>
<BR>
名字表，请使用get()函数访问</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Table.html#tx">tx</A></B></CODE>
<BR>
当前名字表项指针，也可以理解为当前有效的名字表大小（table size）</TD>
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<TD><CODE><B><A HREF="Table.html#Table()">Table</A></B>()</CODE>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="Table.html#debugTable(int)">debugTable</A></B>(int start)</CODE>
<BR>
打印符号表内容，摘自C语言版本的 block() 函数。</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="Table.html#enter(Symbol, int, int, int)">enter</A></B>(<A HREF="Symbol.html" title="class in <Unnamed>">Symbol</A> sym,
int k,
int lev,
int dx)</CODE>
<BR>
把某个符号登陆到名字表中，注意参数跟C语言版本不同</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="Table.Item.html" title="class in <Unnamed>">Table.Item</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="Table.html#get(int)">get</A></B>(int i)</CODE>
<BR>
获得名字表某一项的内容</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Table.html#position(java.lang.String)">position</A></B>(java.lang.String idt)</CODE>
<BR>
在名字表中查找某个名字的位置</TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="table"><!-- --></A><H3>
table</H3>
<PRE>
private <A HREF="Table.Item.html" title="class in <Unnamed>">Table.Item</A>[] <B>table</B></PRE>
<DL>
<DD>名字表，请使用get()函数访问
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<DL>
<DT><B>See Also:</B><DD><A HREF="Table.html#get(int)"><CODE>get(int)</CODE></A></DL>
</DL>
<HR>
<A NAME="tx"><!-- --></A><H3>
tx</H3>
<PRE>
public int <B>tx</B></PRE>
<DL>
<DD>当前名字表项指针，也可以理解为当前有效的名字表大小（table size）
<P>
<DL>
</DL>
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<A NAME="Table()"><!-- --></A><H3>
Table</H3>
<PRE>
public <B>Table</B>()</PRE>
<DL>
</DL>
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<A NAME="get(int)"><!-- --></A><H3>
get</H3>
<PRE>
public <A HREF="Table.Item.html" title="class in <Unnamed>">Table.Item</A> <B>get</B>(int i)</PRE>
<DL>
<DD>获得名字表某一项的内容
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>i</CODE> - 名字表中的位置
<DT><B>Returns:</B><DD>名字表第 i 项的内容</DL>
</DD>
</DL>
<HR>
<A NAME="enter(Symbol, int, int, int)"><!-- --></A><H3>
enter</H3>
<PRE>
public void <B>enter</B>(<A HREF="Symbol.html" title="class in <Unnamed>">Symbol</A> sym,
int k,
int lev,
int dx)</PRE>
<DL>
<DD>把某个符号登陆到名字表中，注意参数跟C语言版本不同
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>sym</CODE> - 要登陆到名字表的符号<DD><CODE>k</CODE> - 该符号的类型：const, var, procedure<DD><CODE>lev</CODE> - 名字所在的层次<DD><CODE>dx</CODE> - 当前应分配的变量的相对地址，注意调用enter()后dx要加一</DL>
</DD>
</DL>
<HR>
<A NAME="debugTable(int)"><!-- --></A><H3>
debugTable</H3>
<PRE>
public void <B>debugTable</B>(int start)</PRE>
<DL>
<DD>打印符号表内容，摘自C语言版本的 block() 函数。
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>start</CODE> - 当前作用域符号表区间的左端</DL>
</DD>
</DL>
<HR>
<A NAME="position(java.lang.String)"><!-- --></A><H3>
position</H3>
<PRE>
public int <B>position</B>(java.lang.String idt)</PRE>
<DL>
<DD>在名字表中查找某个名字的位置
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>idt</CODE> - 要查找的名字
<DT><B>Returns:</B><DD>如果找到则返回名字项的下标，否则返回0</DL>
</DD>
</DL>
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