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Symbol
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SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#methods_inherited_from_class_java.lang.Object">METHOD</A></FONT></TD>
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<H2>
Class Symbol</H2>
<PRE>
java.lang.Object
<IMG SRC="./resources/inherit.gif" ALT="extended by "><B>Symbol</B>
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<DL>
<DT><PRE>public class <B>Symbol</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
C语言版本中采用全局变量sym来存储符号码，并用全局变量id和num来传递语义值。本版本中把这三者封装起来，同时也把符号码以常数的形式封装起来。
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#becomes">becomes</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#beginsym">beginsym</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#callsym">callsym</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#comma">comma</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#constsym">constsym</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#dosym">dosym</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#endsym">endsym</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#eql">eql</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#geq">geq</A></B></CODE>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#gtr">gtr</A></B></CODE>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#id">id</A></B></CODE>
<BR>
标识符名字（如果这个符号是标识符的话）</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#ident">ident</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#ifsym">ifsym</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#leq">leq</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#lparen">lparen</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#lss">lss</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#minus">minus</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#neq">neq</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#nul">nul</A></B></CODE>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#num">num</A></B></CODE>
<BR>
数值大小（如果这个符号是数字的话）</TD>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#number">number</A></B></CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#oddsym">oddsym</A></B></CODE>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#period">period</A></B></CODE>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#plus">plus</A></B></CODE>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#procsym">procsym</A></B></CODE>
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</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#readsym">readsym</A></B></CODE>
<BR>
</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#rparen">rparen</A></B></CODE>
<BR>
</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#semicolon">semicolon</A></B></CODE>
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</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#slash">slash</A></B></CODE>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#symnum">symnum</A></B></CODE>
<BR>
</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#symtype">symtype</A></B></CODE>
<BR>
符号码</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#thensym">thensym</A></B></CODE>
<BR>
</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#times">times</A></B></CODE>
<BR>
</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#varsym">varsym</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#whilesym">whilesym</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="Symbol.html#writesym">writesym</A></B></CODE>
<BR>
</TD>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TD><CODE><B><A HREF="Symbol.html#Symbol(int)">Symbol</A></B>(int stype)</CODE>
<BR>
构造具有特定符号码的符号</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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