adding zephyr-im master branch

zwgc/lexer.h

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+/* This file is part of the Project Athena Zephyr Notification System.
+ * It is one of the source files comprising zwgc, the Zephyr WindowGram
+ * client.
+ *
+ *      Created by:     Marc Horowitz <marc@athena.mit.edu>
+ *
+ *      $Id$
+ *
+ *      Copyright (c) 1989 by the Massachusetts Institute of Technology.
+ *      For copying and distribution information, see the file
+ *      "mit-copyright.h".
+ */
+
+
+#include <zephyr/mit-copyright.h>
+
+#ifndef lexer_MODULE
+#define lexer_MODULE
+
+#include <ctype.h>
+
+/*
+ * is_identifier_char(c) - is c a character that could be part of
+ *                         an identifier?
+ *
+ * NOTE: this information is hardwired into yylex() in lexer.c!
+ */
+
+#define  is_identifier_char(c)                    (isalnum(c) || (c)=='_')
+
+/*
+ * The maximum # of significant letters in an identifier:
+ *
+ * Note: in order for all keywords to be recognized, this must be at least 20.
+ */
+
+#define MAX_IDENTIFIER_LENGTH 128
+
+/*
+ * yylineno - this holds the current line # we are on.  Updated automatically
+ *            by yylex.
+ */
+
+extern int yylineno;
+
+/*
+ * lex_open - this routine [re]initializes the lexer & prepares it to lex
+ *            a file.  Resets current line # to 1.
+ */
+
+extern void lex_open(FILE *);
+
+/*
+ * yylex - performs as per. the yacc manual's requirements
+ */
+
+extern int yylex(void);
+
+#endif