tthese belong elsewhere, but where? - plan9port - [fork] Plan 9 from user space
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---
(DIR) commit c72688efcfdebe28798396239e0fab6e9fc47584
(DIR) parent 24225d557cb14497ec9ebaf109ab1f4cdb0f3b54
(HTM) Author: rsc <devnull@localhost>
Date: Thu, 4 Dec 2003 17:36:03 +0000
tthese belong elsewhere, but where?
Diffstat:
A lib/yaccpar | 241 +++++++++++++++++++++++++++++++
A lib/yaccpars | 242 +++++++++++++++++++++++++++++++
2 files changed, 483 insertions(+), 0 deletions(-)
---
(DIR) diff --git a/lib/yaccpar b/lib/yaccpar
t@@ -0,0 +1,241 @@
+#define YYFLAG -1000
+#define yyclearin yychar = -1
+#define yyerrok yyerrflag = 0
+
+#ifdef yydebug
+#include "y.debug"
+#else
+#define yydebug 0
+char* yytoknames[1]; /* for debugging */
+char* yystates[1]; /* for debugging */
+#endif
+
+/* parser for yacc output */
+
+int yynerrs = 0; /* number of errors */
+int yyerrflag = 0; /* error recovery flag */
+
+extern int fprint(int, char*, ...);
+extern int sprint(char*, char*, ...);
+
+char*
+yytokname(int yyc)
+{
+ static char x[10];
+
+ if(yyc > 0 && yyc <= sizeof(yytoknames)/sizeof(yytoknames[0]))
+ if(yytoknames[yyc-1])
+ return yytoknames[yyc-1];
+ sprint(x, "<%d>", yyc);
+ return x;
+}
+
+char*
+yystatname(int yys)
+{
+ static char x[10];
+
+ if(yys >= 0 && yys < sizeof(yystates)/sizeof(yystates[0]))
+ if(yystates[yys])
+ return yystates[yys];
+ sprint(x, "<%d>\n", yys);
+ return x;
+}
+
+long
+yylex1(void)
+{
+ long yychar;
+ long *t3p;
+ int c;
+
+ yychar = yylex();
+ if(yychar <= 0) {
+ c = yytok1[0];
+ goto out;
+ }
+ if(yychar < sizeof(yytok1)/sizeof(yytok1[0])) {
+ c = yytok1[yychar];
+ goto out;
+ }
+ if(yychar >= YYPRIVATE)
+ if(yychar < YYPRIVATE+sizeof(yytok2)/sizeof(yytok2[0])) {
+ c = yytok2[yychar-YYPRIVATE];
+ goto out;
+ }
+ for(t3p=yytok3;; t3p+=2) {
+ c = t3p[0];
+ if(c == yychar) {
+ c = t3p[1];
+ goto out;
+ }
+ if(c == 0)
+ break;
+ }
+ c = 0;
+
+out:
+ if(c == 0)
+ c = yytok2[1]; /* unknown char */
+ if(yydebug >= 3)
+ fprint(2, "lex %.4lux %s\n", yychar, yytokname(c));
+ return c;
+}
+
+int
+yyparse(void)
+{
+ struct
+ {
+ YYSTYPE yyv;
+ int yys;
+ } yys[YYMAXDEPTH], *yyp, *yypt;
+ short *yyxi;
+ int yyj, yym, yystate, yyn, yyg;
+ long yychar;
+ YYSTYPE save1, save2;
+ int save3, save4;
+
+ save1 = yylval;
+ save2 = yyval;
+ save3 = yynerrs;
+ save4 = yyerrflag;
+
+ yystate = 0;
+ yychar = -1;
+ yynerrs = 0;
+ yyerrflag = 0;
+ yyp = &yys[-1];
+ goto yystack;
+
+ret0:
+ yyn = 0;
+ goto ret;
+
+ret1:
+ yyn = 1;
+ goto ret;
+
+ret:
+ yylval = save1;
+ yyval = save2;
+ yynerrs = save3;
+ yyerrflag = save4;
+ return yyn;
+
+yystack:
+ /* put a state and value onto the stack */
+ if(yydebug >= 4)
+ fprint(2, "char %s in %s", yytokname(yychar), yystatname(yystate));
+
+ yyp++;
+ if(yyp >= &yys[YYMAXDEPTH]) {
+ yyerror("yacc stack overflow");
+ goto ret1;
+ }
+ yyp->yys = yystate;
+ yyp->yyv = yyval;
+
+yynewstate:
+ yyn = yypact[yystate];
+ if(yyn <= YYFLAG)
+ goto yydefault; /* simple state */
+ if(yychar < 0)
+ yychar = yylex1();
+ yyn += yychar;
+ if(yyn < 0 || yyn >= YYLAST)
+ goto yydefault;
+ yyn = yyact[yyn];
+ if(yychk[yyn] == yychar) { /* valid shift */
+ yychar = -1;
+ yyval = yylval;
+ yystate = yyn;
+ if(yyerrflag > 0)
+ yyerrflag--;
+ goto yystack;
+ }
+
+yydefault:
+ /* default state action */
+ yyn = yydef[yystate];
+ if(yyn == -2) {
+ if(yychar < 0)
+ yychar = yylex1();
+
+ /* look through exception table */
+ for(yyxi=yyexca;; yyxi+=2)
+ if(yyxi[0] == -1 && yyxi[1] == yystate)
+ break;
+ for(yyxi += 2;; yyxi += 2) {
+ yyn = yyxi[0];
+ if(yyn < 0 || yyn == yychar)
+ break;
+ }
+ yyn = yyxi[1];
+ if(yyn < 0)
+ goto ret0;
+ }
+ if(yyn == 0) {
+ /* error ... attempt to resume parsing */
+ switch(yyerrflag) {
+ case 0: /* brand new error */
+ yyerror("syntax error");
+ yynerrs++;
+ if(yydebug >= 1) {
+ fprint(2, "%s", yystatname(yystate));
+ fprint(2, "saw %s\n", yytokname(yychar));
+ }
+
+ case 1:
+ case 2: /* incompletely recovered error ... try again */
+ yyerrflag = 3;
+
+ /* find a state where "error" is a legal shift action */
+ while(yyp >= yys) {
+ yyn = yypact[yyp->yys] + YYERRCODE;
+ if(yyn >= 0 && yyn < YYLAST) {
+ yystate = yyact[yyn]; /* simulate a shift of "error" */
+ if(yychk[yystate] == YYERRCODE)
+ goto yystack;
+ }
+
+ /* the current yyp has no shift onn "error", pop stack */
+ if(yydebug >= 2)
+ fprint(2, "error recovery pops state %d, uncovers %d\n",
+ yyp->yys, (yyp-1)->yys );
+ yyp--;
+ }
+ /* there is no state on the stack with an error shift ... abort */
+ goto ret1;
+
+ case 3: /* no shift yet; clobber input char */
+ if(yydebug >= 2)
+ fprint(2, "error recovery discards %s\n", yytokname(yychar));
+ if(yychar == YYEOFCODE)
+ goto ret1;
+ yychar = -1;
+ goto yynewstate; /* try again in the same state */
+ }
+ }
+
+ /* reduction by production yyn */
+ if(yydebug >= 2)
+ fprint(2, "reduce %d in:\n\t%s", yyn, yystatname(yystate));
+
+ yypt = yyp;
+ yyp -= yyr2[yyn];
+ yyval = (yyp+1)->yyv;
+ yym = yyn;
+
+ /* consult goto table to find next state */
+ yyn = yyr1[yyn];
+ yyg = yypgo[yyn];
+ yyj = yyg + yyp->yys + 1;
+
+ if(yyj >= YYLAST || yychk[yystate=yyact[yyj]] != -yyn)
+ yystate = yyact[yyg];
+ switch(yym) {
+ $A
+ }
+ goto yystack; /* stack new state and value */
+}
(DIR) diff --git a/lib/yaccpars b/lib/yaccpars
t@@ -0,0 +1,242 @@
+#define YYFLAG -1000
+#define YYERROR goto yyerrlab
+#define YYACCEPT return(0)
+#define YYABORT return(1)
+#define yyclearin yychar = -1
+#define yyerrok yyerrflag = 0
+
+#ifdef yydebug
+#include "y.debug"
+#else
+#define yydebug 0
+char* yytoknames[1]; /* for debugging */
+char* yystates[1]; /* for debugging */
+#endif
+
+/* parser for yacc output */
+
+int yynerrs = 0; /* number of errors */
+int yyerrflag = 0; /* error recovery flag */
+
+char*
+yytokname(int yyc)
+{
+ static char x[10];
+
+ if(yyc > 0 && yyc <= sizeof(yytoknames)/sizeof(yytoknames[0]))
+ if(yytoknames[yyc-1])
+ return yytoknames[yyc-1];
+ sprintf(x, "<%d>", yyc);
+ return x;
+}
+
+char*
+yystatname(int yys)
+{
+ static char x[10];
+
+ if(yys >= 0 && yys < sizeof(yystates)/sizeof(yystates[0]))
+ if(yystates[yys])
+ return yystates[yys];
+ sprintf(x, "<%d>\n", yys);
+ return x;
+}
+
+long
+yylex1(void)
+{
+ long yychar;
+ long *t3p;
+ int c;
+
+ yychar = yylex();
+ if(yychar <= 0) {
+ c = yytok1[0];
+ goto out;
+ }
+ if(yychar < sizeof(yytok1)/sizeof(yytok1[0])) {
+ c = yytok1[yychar];
+ goto out;
+ }
+ if(yychar >= YYPRIVATE)
+ if(yychar < YYPRIVATE+sizeof(yytok2)/sizeof(yytok2[0])) {
+ c = yytok2[yychar-YYPRIVATE];
+ goto out;
+ }
+ for(t3p=yytok3;; t3p+=2) {
+ c = t3p[0];
+ if(c == yychar) {
+ c = t3p[1];
+ goto out;
+ }
+ if(c == 0)
+ break;
+ }
+ c = 0;
+
+out:
+ if(c == 0)
+ c = yytok2[1]; /* unknown char */
+ if(yydebug >= 3)
+ printf("lex %.4lX %s\n", yychar, yytokname(c));
+ return c;
+}
+
+int
+yyparse(void)
+{
+ struct
+ {
+ YYSTYPE yyv;
+ int yys;
+ } yys[YYMAXDEPTH], *yyp, *yypt;
+ short *yyxi;
+ int yyj, yym, yystate, yyn, yyg;
+ YYSTYPE save1, save2;
+ int save3, save4;
+ long yychar;
+
+ save1 = yylval;
+ save2 = yyval;
+ save3 = yynerrs;
+ save4 = yyerrflag;
+
+ yystate = 0;
+ yychar = -1;
+ yynerrs = 0;
+ yyerrflag = 0;
+ yyp = &yys[-1];
+ goto yystack;
+
+ret0:
+ yyn = 0;
+ goto ret;
+
+ret1:
+ yyn = 1;
+ goto ret;
+
+ret:
+ yylval = save1;
+ yyval = save2;
+ yynerrs = save3;
+ yyerrflag = save4;
+ return yyn;
+
+yystack:
+ /* put a state and value onto the stack */
+ if(yydebug >= 4)
+ printf("char %s in %s", yytokname(yychar), yystatname(yystate));
+
+ yyp++;
+ if(yyp >= &yys[YYMAXDEPTH]) {
+ yyerror("yacc stack overflow");
+ goto ret1;
+ }
+ yyp->yys = yystate;
+ yyp->yyv = yyval;
+
+yynewstate:
+ yyn = yypact[yystate];
+ if(yyn <= YYFLAG)
+ goto yydefault; /* simple state */
+ if(yychar < 0)
+ yychar = yylex1();
+ yyn += yychar;
+ if(yyn < 0 || yyn >= YYLAST)
+ goto yydefault;
+ yyn = yyact[yyn];
+ if(yychk[yyn] == yychar) { /* valid shift */
+ yychar = -1;
+ yyval = yylval;
+ yystate = yyn;
+ if(yyerrflag > 0)
+ yyerrflag--;
+ goto yystack;
+ }
+
+yydefault:
+ /* default state action */
+ yyn = yydef[yystate];
+ if(yyn == -2) {
+ if(yychar < 0)
+ yychar = yylex1();
+
+ /* look through exception table */
+ for(yyxi=yyexca;; yyxi+=2)
+ if(yyxi[0] == -1 && yyxi[1] == yystate)
+ break;
+ for(yyxi += 2;; yyxi += 2) {
+ yyn = yyxi[0];
+ if(yyn < 0 || yyn == yychar)
+ break;
+ }
+ yyn = yyxi[1];
+ if(yyn < 0)
+ goto ret0;
+ }
+ if(yyn == 0) {
+ /* error ... attempt to resume parsing */
+ switch(yyerrflag) {
+ case 0: /* brand new error */
+ yyerror("syntax error");
+ if(yydebug >= 1) {
+ printf("%s", yystatname(yystate));
+ printf("saw %s\n", yytokname(yychar));
+ }
+yyerrlab:
+ yynerrs++;
+
+ case 1:
+ case 2: /* incompletely recovered error ... try again */
+ yyerrflag = 3;
+
+ /* find a state where "error" is a legal shift action */
+ while(yyp >= yys) {
+ yyn = yypact[yyp->yys] + YYERRCODE;
+ if(yyn >= 0 && yyn < YYLAST) {
+ yystate = yyact[yyn]; /* simulate a shift of "error" */
+ if(yychk[yystate] == YYERRCODE)
+ goto yystack;
+ }
+
+ /* the current yyp has no shift onn "error", pop stack */
+ if(yydebug >= 2)
+ printf("error recovery pops state %d, uncovers %d\n",
+ yyp->yys, (yyp-1)->yys );
+ yyp--;
+ }
+ /* there is no state on the stack with an error shift ... abort */
+ goto ret1;
+
+ case 3: /* no shift yet; clobber input char */
+ if(yydebug >= YYEOFCODE)
+ printf("error recovery discards %s\n", yytokname(yychar));
+ if(yychar == YYEOFCODE)
+ goto ret1;
+ yychar = -1;
+ goto yynewstate; /* try again in the same state */
+ }
+ }
+
+ /* reduction by production yyn */
+ if(yydebug >= 2)
+ printf("reduce %d in:\n\t%s", yyn, yystatname(yystate));
+
+ yypt = yyp;
+ yyp -= yyr2[yyn];
+ yyval = (yyp+1)->yyv;
+ yym = yyn;
+
+ /* consult goto table to find next state */
+ yyn = yyr1[yyn];
+ yyg = yypgo[yyn];
+ yyj = yyg + yyp->yys + 1;
+
+ if(yyj >= YYLAST || yychk[yystate=yyact[yyj]] != -yyn)
+ yystate = yyact[yyg];
+ switch(yym) {
+ $A
+ }
+ goto yystack; /* stack new state and value */
+}