+/* Copyright (c) 1979 Regents of the University of California */
+
+/* static char sccsid[] = "@(#)yy.h 1.1 %G%"; */
+
+#include "y.tab.h"
+/*
+ * INPUT/OUTPUT
+ */
+
+/*
+ * The buffer for the input file is normally "ibuf".
+ * When files are included, however, this may be
+ * pushed down in the stack of currently active
+ * files. For this reason, the pointer ibp always
+ * references the i/o buffer of the current input file.
+ */
+FILE *ibuf, *ibp;
+
+/*
+ * Line and token buffers. Charbuf is the character buffer for
+ * input lines, token the buffer for tokens returned
+ * by the scanner. CBSIZE defines the maximum line
+ * length allowed on input and is doubtless too small.
+ * The token buffer should be a local array in yylex.
+ */
+#define CBSIZE 161
+
+char charbuf[CBSIZE], *bufp, token[CBSIZE];
+
+#define digit(c) (c >= '0' && c <= '9')
+#define alph(c) ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
+
+/*
+ * Flag to prevent reprinting current line after
+ * an error.
+ */
+char yyprtd;
+\f
+/*
+ * The following variables are maintained by
+ * the scanner in the file lex and used in scanning
+ * and in parsing.
+ *
+ * The variable yychar is the current scanner character.
+ * Currently, the scanner must be called as
+ * yychar = yylex()
+ * even though it should set yychar itself.
+ * Yychar has value YEOF at end of file, and negative value if
+ * there is no yychar, e.g. after a shift in the parser.
+ *
+ * The variable yycol is the current column in the line whose number
+ * is given by yyline. Yyecol and yyeline give the position for an
+ * error message to flag, usually the start of an input token.
+ * Yylval is the semantic return from the scanner.
+ *
+ * In fact all of these variables are "per token".
+ * In the usual case, only the copies in the scanner token structure
+ * 'Y' are used, and the #defines below serve to make them look
+ * like variables.
+ *
+ * For the purposes of the error recovery, however, they are copied
+ * and restored quite freely. For the error recovery also, the
+ * file name which the input line this token is on and the seek
+ * pointer of this line in its source file are saved as yyefile
+ * and yyseekp. The global variable yylinpt is the seek pointer
+ * of the current input line.
+ */
+int yycol;
+int yyline;
+int yyseqid;
+int yysavc;
+int yylinpt;
+
+/* *** NOTE ***
+ * It would be much better to not have the Yyeline and Yyefile
+ * in the scanner structure and to have a mechanism for mapping
+ * seqid's to these globally.
+ */
+struct yytok {
+ int Yychar;
+ int Yylval;
+ int Yyecol;
+ int Yyeline;
+ int Yyseekp;
+ char *Yyefile;
+ int Yyeseqid;
+} Y, OY;
+
+#define yychar Y.Yychar
+#define yylval Y.Yylval
+#define yyecol Y.Yyecol
+#define yyeline Y.Yyeline
+#define yyseekp Y.Yyseekp
+#define yyefile Y.Yyefile
+#define yyeseqid Y.Yyeseqid
+
+/*
+ * Yyval is the semantic value returned by a reduction.
+ * It is what "$$" is expanded to by yacc.
+ */
+int *Ps, *yyval;
+
+/*
+ * N is the length of a reduction.
+ * Used externally by "lineof" to get the left and
+ * right margins for a reduction.
+ */
+int N;
+/*
+ * Definitions for looking up keywords.
+ * The keyword array is called yykey, and
+ * lastkey points at the end of it.
+ */
+char *lastkey;
+
+struct kwtab {
+ char *kw_str;
+ int kw_val;
+} yykey[];
+\f
+/*
+ * ERROR RECOVERY EXTERNALS
+ */
+
+#define CLIMIT 40 /* see yyrecover.c */
+char *tokname();
+char *charname();
+
+char *classes[];
+
+/*
+ * Tokens which yacc doesn't define
+ */
+#define YEOF 0
+#define ERROR 256
+
+/*
+ * Limit on the number of syntax errors
+ */
+#define MAXSYNERR 100
+
+/*
+ * Big costs
+ */
+#define HUGE 50
+#define INFINITY 100
+
+/*
+ * Kinds of panics
+ */
+#define PDECL 0
+#define PSTAT 1
+#define PEXPR 2
+#define PPROG 3
+
+#define yyresume() yyResume = 1;
+
+char yyResume;
+
+char dquote;
+
+char errout;
+
+/*
+ * Yyidwant and yyidhave are the namelist classes
+ * of identifiers associated with a identifier reduce
+ * error, set before the recovery is called.
+ * Since they may be set again during the forward move
+ * they must be saved by yyrecover, which uses them in printing
+ * error messages.
+ */
+int yyidhave, yyidwant;
+\f
+/*
+ * The variables yy*shifts are used to prevent looping and the printing
+ * of spurious messages in the parser. Yyshifts gives the number of
+ * true input shifts since the last corrective action. YyOshifts
+ * is the value of yyshifts before it was last cleared, and is used
+ * by yyPerror in yypanic.c to suppress messages.
+ *
+ * Yytshifts counts true input shifts. It is used to prevent looping
+ * inserting unique symbols. If yytshifts == yyTshifts (local to
+ * yyrecover.c) then there has been no shift over true input since
+ * the last unique symbol insertion. We refuse, in this case,
+ * to insert more unique symbols so as to prevent looping.
+ *
+ * The recovery cannot loop because it guarantees the progress of the
+ * parse, i.e.:
+ *
+ * 1) Any insertion guarantees to shift over 2 symbols, a replacement
+ * over one symbol.
+ *
+ * 2) Unique symbol insertions are limited to one for each true
+ * symbol of input, or "safe" insertion of the keywords "end"
+ * and "until" at zero cost (safe since these are know to match
+ * stack that cannot have been generated - e.g. "begin" or "repeat")
+ *
+ * 3) We never panic more than once from a given state without
+ * shifting over input, i.e. we force the parse stack to shrink
+ * after each unsuccessful panic.
+ */
+int yyshifts, yyOshifts;
+unsigned yytshifts;
+
+#ifdef PXP
+\f
+/*
+ * Identifier class definitions
+ */
+#define UNDEF 0
+#define CONST 1
+#define TYPE 2
+#define VAR 3
+#define ARRAY 4
+#define PTRFILE 5
+#define RECORD 6
+#define FIELD 7
+#define PROC 8
+#define FUNC 9
+#define FVAR 10
+#define REF 11
+#define PTR 12
+#define FILET 13
+#define SET 14
+#define RANGE 15
+#define LABEL 16
+#define WITHPTR 17
+#define SCAL 18
+#define STR 19
+#define PROG 20
+#define IMPROPER 21
+\f
+/*
+ * COMMENT FORMATTING DEFINITIONS
+ */
+
+/*
+ * Count of tokens on this input line
+ * Note that this can be off if input is not syntactically correct.
+ */
+int yytokcnt;
+int yywhcnt;
+
+/*
+ * Types of comments
+ */
+#define CLMARG 0
+#define CALIGN 1
+#define CTRAIL 2
+#define CRMARG 3
+#define CSRMARG 4
+#define CNL 5
+#define CNLBL 6
+#define CFORM 7
+#define CINCLUD 8
+
+/*
+ * Comment structure
+ * Cmhp is the head of the current list of comments
+ */
+struct comment {
+ struct comment *cmnext;
+ int cmdelim;
+ struct commline *cml;
+ int cmjust;
+ int cmseqid;
+} *cmhp;
+
+/*
+ * Structure for holding a comment line
+ */
+struct commline {
+ char *cmtext;
+ int cmcol; /* Only used for first line of comment currently */
+ struct commline *cml;
+};
+
+struct W {
+ int Wseqid;
+ int Wcol;
+} yyw[MAXDEPTH + 1], *yypw;
+
+#define commform() quickcomm(CFORM)
+#define commnl() quickcomm(CNL)
+#define commnlbl() quickcomm(CNLBL)
+#endif
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