1BSD/pi/yyseman.c

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#
/*
 * pi - Pascal interpreter code translator
 *
 * Charles Haley, Bill Joy UCB
 * Version 1.0 August 1977
 *
 *
 * pxp - Pascal execution profiler
 *
 * Bill Joy UCB
 * Version 1.0 August 1977
 */

#include "whoami"
#include "0.h"
#include "yy.h"

/*
 * Assign semantics to a generated token
 *
 * Most terminals have a semantic value the current
 * input line.  If they are generated they are flagged
 * by having this number negated.
 *
 * The terminals which have true semantics such
 * as identifiers and strings are instead given
 * semantic value NIL here - we do not attempt
 * to do repair, e.g. by giving generated integers
 * the value 1, etc.
 */
nullsem(ch)
	int ch;
{

	switch (ch) {
		case YID:
		case YINT:
		case YNUMB:
		case YBINT:
		case YSTRING:
			return (NIL);
		default:
			return (-yyeline);
	}
}