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java_cup</FONT>
<BR>
Class lexer</H2>
<PRE>
java.lang.Object
<IMG SRC="../resources/inherit.gif" ALT="extended by "><B>java_cup.lexer</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>lexer</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
This class implements a small scanner (aka lexical analyzer or lexer) for
the JavaCup specification. This scanner reads characters from standard
input (System.in) and returns integers corresponding to the terminal
number of the next Symbol. Once end of input is reached the EOF Symbol is
returned on every subsequent call.<p>
Symbols currently returned include: <pre>
Symbol Constant Returned Symbol Constant Returned
------ ----------------- ------ -----------------
"package" PACKAGE "import" IMPORT
"code" CODE "action" ACTION
"parser" PARSER "terminal" TERMINAL
"non" NON "init" INIT
"scan" SCAN "with" WITH
"start" START "precedence" PRECEDENCE
"left" LEFT "right" RIGHT
"nonassoc" NONASSOC "%prec PRECENT_PREC
[ LBRACK ] RBRACK
; SEMI
, COMMA * STAR
. DOT : COLON
::= COLON_COLON_EQUALS | BAR
identifier ID {:...:} CODE_STRING
"nonterminal" NONTERMINAL
</pre>
All symbol constants are defined in sym.java which is generated by
JavaCup from parser.cup.<p>
In addition to the scanner proper (called first via init() then with
next_token() to get each Symbol) this class provides simple error and
warning routines and keeps a count of errors and warnings that is
publicly accessible.<p>
This class is "static" (i.e., it has only static members and methods).
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>last updated: 7/3/96</DD>
<DT><B>Author:</B></DT>
<DD>Frank Flannery</DD>
</DL>
<HR>
<P>
<!-- =========== FIELD SUMMARY =========== -->
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#absolute_position">absolute_position</A></B></CODE>
<BR>
Character position in current line.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static java.util.Hashtable</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#char_symbols">char_symbols</A></B></CODE>
<BR>
Table of single character symbols.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#current_line">current_line</A></B></CODE>
<BR>
Current line number for use in error messages.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#current_position">current_position</A></B></CODE>
<BR>
Character position in current line.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#EOF_CHAR">EOF_CHAR</A></B></CODE>
<BR>
EOF constant.</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="../java_cup/lexer.html#error_count">error_count</A></B></CODE>
<BR>
Count of total errors detected so far.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static java.util.Hashtable</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#keywords">keywords</A></B></CODE>
<BR>
Table of keywords.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#next_char">next_char</A></B></CODE>
<BR>
First character of lookahead.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#next_char2">next_char2</A></B></CODE>
<BR>
Second character of lookahead.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#next_char3">next_char3</A></B></CODE>
<BR>
Second character of lookahead.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#next_char4">next_char4</A></B></CODE>
<BR>
Second character of lookahead.</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="../java_cup/lexer.html#warning_count">warning_count</A></B></CODE>
<BR>
Count of warnings issued so far</TD>
</TR>
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<CODE>protected static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#advance()">advance</A></B>()</CODE>
<BR>
Advance the scanner one character in the input stream.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../java_cup/runtime/Symbol.html" title="class in java_cup.runtime">Symbol</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#debug_next_token()">debug_next_token</A></B>()</CODE>
<BR>
Debugging version of next_token().</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static <A HREF="../java_cup/runtime/Symbol.html" title="class in java_cup.runtime">Symbol</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#do_code_string()">do_code_string</A></B>()</CODE>
<BR>
Swallow up a code string.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static <A HREF="../java_cup/runtime/Symbol.html" title="class in java_cup.runtime">Symbol</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#do_id()">do_id</A></B>()</CODE>
<BR>
Process an identifier.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#emit_error(java.lang.String)">emit_error</A></B>(java.lang.String message)</CODE>
<BR>
Emit an error message.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#emit_warn(java.lang.String)">emit_warn</A></B>(java.lang.String message)</CODE>
<BR>
Emit a warning message.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#find_single_char(int)">find_single_char</A></B>(int ch)</CODE>
<BR>
Try to look up a single character symbol, returns -1 for not found.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#id_char(int)">id_char</A></B>(int ch)</CODE>
<BR>
Determine if a character is ok for the middle of an id.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#id_start_char(int)">id_start_char</A></B>(int ch)</CODE>
<BR>
Determine if a character is ok to start an id.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#init()">init</A></B>()</CODE>
<BR>
Initialize the scanner.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../java_cup/runtime/Symbol.html" title="class in java_cup.runtime">Symbol</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#next_token()">next_token</A></B>()</CODE>
<BR>
Return one Symbol.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static <A HREF="../java_cup/runtime/Symbol.html" title="class in java_cup.runtime">Symbol</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#real_next_token()">real_next_token</A></B>()</CODE>
<BR>
The actual routine to return one Symbol.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../java_cup/lexer.html#swallow_comment()">swallow_comment</A></B>()</CODE>
<BR>
Handle swallowing up a comment.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<P>
<!-- ============ FIELD DETAIL =========== -->
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<A NAME="next_char"><!-- --></A><H3>
next_char</H3>
<PRE>
protected static int <B>next_char</B></PRE>
<DL>
<DD>First character of lookahead.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="next_char2"><!-- --></A><H3>
next_char2</H3>
<PRE>
protected static int <B>next_char2</B></PRE>
<DL>
<DD>Second character of lookahead.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="next_char3"><!-- --></A><H3>
next_char3</H3>
<PRE>
protected static int <B>next_char3</B></PRE>
<DL>
<DD>Second character of lookahead.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="next_char4"><!-- --></A><H3>
next_char4</H3>
<PRE>
protected static int <B>next_char4</B></PRE>
<DL>
<DD>Second character of lookahead.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="EOF_CHAR"><!-- --></A><H3>
EOF_CHAR</H3>
<PRE>
protected static final int <B>EOF_CHAR</B></PRE>
<DL>
<DD>EOF constant.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../constant-values.html#java_cup.lexer.EOF_CHAR">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="keywords"><!-- --></A><H3>
keywords</H3>
<PRE>
protected static java.util.Hashtable <B>keywords</B></PRE>
<DL>
<DD>Table of keywords. Keywords are initially treated as identifiers.
Just before they are returned we look them up in this table to see if
they match one of the keywords. The string of the name is the key here,
which indexes Integer objects holding the symbol number.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="char_symbols"><!-- --></A><H3>
char_symbols</H3>
<PRE>
protected static java.util.Hashtable <B>char_symbols</B></PRE>
<DL>
<DD>Table of single character symbols. For ease of implementation, we
store all unambiguous single character Symbols in this table of Integer
objects keyed by Integer objects with the numerical value of the
appropriate char (currently Character objects have a bug which precludes
their use in tables).
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="current_line"><!-- --></A><H3>
current_line</H3>
<PRE>
protected static int <B>current_line</B></PRE>
<DL>
<DD>Current line number for use in error messages.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="current_position"><!-- --></A><H3>
current_position</H3>
<PRE>
protected static int <B>current_position</B></PRE>
<DL>
<DD>Character position in current line.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="absolute_position"><!-- --></A><H3>
absolute_position</H3>
<PRE>
protected static int <B>absolute_position</B></PRE>
<DL>
<DD>Character position in current line.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="error_count"><!-- --></A><H3>
error_count</H3>
<PRE>
public static int <B>error_count</B></PRE>
<DL>
<DD>Count of total errors detected so far.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="warning_count"><!-- --></A><H3>
warning_count</H3>
<PRE>
public static int <B>warning_count</B></PRE>
<DL>
<DD>Count of warnings issued so far
<P>
<DL>
</DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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</TABLE>
<A NAME="init()"><!-- --></A><H3>
init</H3>
<PRE>
public static void <B>init</B>()
throws java.io.IOException</PRE>
<DL>
<DD>Initialize the scanner. This sets up the keywords and char_symbols
tables and reads the first two characters of lookahead.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="advance()"><!-- --></A><H3>
advance</H3>
<PRE>
protected static void <B>advance</B>()
throws java.io.IOException</PRE>
<DL>
<DD>Advance the scanner one character in the input stream. This moves
next_char2 to next_char and then reads a new next_char2.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="emit_error(java.lang.String)"><!-- --></A><H3>
emit_error</H3>
<PRE>
public static void <B>emit_error</B>(java.lang.String message)</PRE>
<DL>
<DD>Emit an error message. The message will be marked with both the
current line number and the position in the line. Error messages
are printed on standard error (System.err).
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>message</CODE> - the message to print.</DL>
</DD>
</DL>
<HR>
<A NAME="emit_warn(java.lang.String)"><!-- --></A><H3>
emit_warn</H3>
<PRE>
public static void <B>emit_warn</B>(java.lang.String message)</PRE>
<DL>
<DD>Emit a warning message. The message will be marked with both the
current line number and the position in the line. Messages are
printed on standard error (System.err).
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>message</CODE> - the message to print.</DL>
</DD>
</DL>
<HR>
<A NAME="id_start_char(int)"><!-- --></A><H3>
id_start_char</H3>
<PRE>
protected static boolean <B>id_start_char</B>(int ch)</PRE>
<DL>
<DD>Determine if a character is ok to start an id.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>ch</CODE> - the character in question.</DL>
</DD>
</DL>
<HR>
<A NAME="id_char(int)"><!-- --></A><H3>
id_char</H3>
<PRE>
protected static boolean <B>id_char</B>(int ch)</PRE>
<DL>
<DD>Determine if a character is ok for the middle of an id.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>ch</CODE> - the character in question.</DL>
</DD>
</DL>
<HR>
<A NAME="find_single_char(int)"><!-- --></A><H3>
find_single_char</H3>
<PRE>
protected static int <B>find_single_char</B>(int ch)</PRE>
<DL>
<DD>Try to look up a single character symbol, returns -1 for not found.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>ch</CODE> - the character in question.</DL>
</DD>
</DL>
<HR>
<A NAME="swallow_comment()"><!-- --></A><H3>
swallow_comment</H3>
<PRE>
protected static void <B>swallow_comment</B>()
throws java.io.IOException</PRE>
<DL>
<DD>Handle swallowing up a comment. Both old style C and new style C++
comments are handled.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="do_code_string()"><!-- --></A><H3>
do_code_string</H3>
<PRE>
protected static <A HREF="../java_cup/runtime/Symbol.html" title="class in java_cup.runtime">Symbol</A> <B>do_code_string</B>()
throws java.io.IOException</PRE>
<DL>
<DD>Swallow up a code string. Code strings begin with "{:" and include
all characters up to the first occurrence of ":}" (there is no way to
include ":}" inside a code string). The routine returns a String
object suitable for return by the scanner.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="do_id()"><!-- --></A><H3>
do_id</H3>
<PRE>
protected static <A HREF="../java_cup/runtime/Symbol.html" title="class in java_cup.runtime">Symbol</A> <B>do_id</B>()
throws java.io.IOException</PRE>
<DL>
<DD>Process an identifier. Identifiers begin with a letter, underscore,
or dollar sign, which is followed by zero or more letters, numbers,
underscores or dollar signs. This routine returns a String suitable
for return by the scanner.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="next_token()"><!-- --></A><H3>
next_token</H3>
<PRE>
public static <A HREF="../java_cup/runtime/Symbol.html" title="class in java_cup.runtime">Symbol</A> <B>next_token</B>()
throws java.io.IOException</PRE>
<DL>
<DD>Return one Symbol. This is the main external interface to the scanner.
It consumes sufficient characters to determine the next input Symbol
and returns it. To help with debugging, this routine actually calls
real_next_token() which does the work. If you need to debug the
parser, this can be changed to call debug_next_token() which prints
a debugging message before returning the Symbol.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="debug_next_token()"><!-- --></A><H3>
debug_next_token</H3>
<PRE>
public static <A HREF="../java_cup/runtime/Symbol.html" title="class in java_cup.runtime">Symbol</A> <B>debug_next_token</B>()
throws java.io.IOException</PRE>
<DL>
<DD>Debugging version of next_token(). This routine calls the real scanning
routine, prints a message on System.out indicating what the Symbol is,
then returns it.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="real_next_token()"><!-- --></A><H3>
real_next_token</H3>
<PRE>
protected static <A HREF="../java_cup/runtime/Symbol.html" title="class in java_cup.runtime">Symbol</A> <B>real_next_token</B>()
throws java.io.IOException</PRE>
<DL>
<DD>The actual routine to return one Symbol. This is normally called from
next_token(), but for debugging purposes can be called indirectly from
debug_next_token().
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
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