tmove it here - plan9port - [fork] Plan 9 from user space
(HTM) git clone git://src.adamsgaard.dk/plan9port
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---
(DIR) commit bc72254a1abedc43c9c90685dda81efe92b460fe
(DIR) parent 61a3e9c44daa2d4a5f2ac8941f6418c399568f39
(HTM) Author: rsc <devnull@localhost>
Date: Mon, 17 May 2004 03:28:58 +0000
move it here
Diffstat:
A lib/lex.ncform | 191 +++++++++++++++++++++++++++++++
1 file changed, 191 insertions(+), 0 deletions(-)
---
(DIR) diff --git a/lib/lex.ncform b/lib/lex.ncform
t@@ -0,0 +1,191 @@
+/* #pragma lib "libl.a" */
+int yylineno =1;
+# define YYU(x) x
+char yytext[YYLMAX];
+struct yysvf *yylstate [YYLMAX], **yylsp, **yyolsp;
+Uchar yysbuf[YYLMAX];
+Uchar *yysptr = yysbuf;
+int *yyfnd;
+extern struct yysvf *yyestate;
+int yyprevious = YYNEWLINE;
+# ifdef LEXDEBUG
+extern void allprint(char);
+# endif
+int
+yylook(void){
+ struct yysvf *yystate, **lsp;
+ struct yywork *yyt;
+ struct yysvf *yyz;
+ int yych;
+ struct yywork *yyr;
+# ifdef LEXDEBUG
+ int debug;
+# endif
+ Uchar *yylastch;
+ /* start off machines */
+# ifdef LEXDEBUG
+ debug = 0;
+# endif
+ if (!yymorfg)
+ yylastch = (Uchar*)yytext;
+ else {
+ yymorfg=0;
+ yylastch = (Uchar*)yytext+yyleng;
+ }
+ for(;;){
+ lsp = yylstate;
+ yyestate = yystate = yybgin;
+ if (yyprevious==YYNEWLINE) yystate++;
+ for (;;){
+# ifdef LEXDEBUG
+ if(debug)fprintf(yyout,"state %d\n",yystate-yysvec-1);
+# endif
+ yyt = yystate->yystoff;
+ if(yyt == yycrank){ /* may not be any transitions */
+ yyz = yystate->yyother;
+ if(yyz == 0)break;
+ if(yyz->yystoff == yycrank)break;
+ }
+ *yylastch++ = yych = input();
+ tryagain:
+# ifdef LEXDEBUG
+ if(debug){
+ fprintf(yyout,"char ");
+ allprint(yych);
+ putchar('\n');
+ }
+# endif
+ yyr = yyt;
+ if ( (int)yyt > (int)yycrank){
+ yyt = yyr + yych;
+ if (yyt <= yytop && yyt->verify+yysvec == yystate){
+ if(yyt->advance+yysvec == YYLERR) /* error transitions */
+ {unput(*--yylastch);break;}
+ *lsp++ = yystate = yyt->advance+yysvec;
+ goto contin;
+ }
+ }
+# ifdef YYOPTIM
+ else if((int)yyt < (int)yycrank) { /* r < yycrank */
+ yyt = yyr = yycrank+(yycrank-yyt);
+# ifdef LEXDEBUG
+ if(debug)fprintf(yyout,"compressed state\n");
+# endif
+ yyt = yyt + yych;
+ if(yyt <= yytop && yyt->verify+yysvec == yystate){
+ if(yyt->advance+yysvec == YYLERR) /* error transitions */
+ {unput(*--yylastch);break;}
+ *lsp++ = yystate = yyt->advance+yysvec;
+ goto contin;
+ }
+ yyt = yyr + YYU(yymatch[yych]);
+# ifdef LEXDEBUG
+ if(debug){
+ fprintf(yyout,"try fall back character ");
+ allprint(YYU(yymatch[yych]));
+ putchar('\n');
+ }
+# endif
+ if(yyt <= yytop && yyt->verify+yysvec == yystate){
+ if(yyt->advance+yysvec == YYLERR) /* error transition */
+ {unput(*--yylastch);break;}
+ *lsp++ = yystate = yyt->advance+yysvec;
+ goto contin;
+ }
+ }
+ if ((yystate = yystate->yyother) && (yyt= yystate->yystoff) != yycrank){
+# ifdef LEXDEBUG
+ if(debug)fprintf(yyout,"fall back to state %d\n",yystate-yysvec-1);
+# endif
+ goto tryagain;
+ }
+# endif
+ else
+ {unput(*--yylastch);break;}
+ contin:
+# ifdef LEXDEBUG
+ if(debug){
+ fprintf(yyout,"state %d char ",yystate-yysvec-1);
+ allprint(yych);
+ putchar('\n');
+ }
+# endif
+ ;
+ }
+# ifdef LEXDEBUG
+ if(debug){
+ fprintf(yyout,"stopped at %d with ",*(lsp-1)-yysvec-1);
+ allprint(yych);
+ putchar('\n');
+ }
+# endif
+ while (lsp-- > yylstate){
+ *yylastch-- = 0;
+ if (*lsp != 0 && (yyfnd= (*lsp)->yystops) && *yyfnd > 0){
+ yyolsp = lsp;
+ if(yyextra[*yyfnd]){ /* must backup */
+ while(yyback((*lsp)->yystops,-*yyfnd) != 1 && lsp > yylstate){
+ lsp--;
+ unput(*yylastch--);
+ }
+ }
+ yyprevious = YYU(*yylastch);
+ yylsp = lsp;
+ yyleng = yylastch-(Uchar*)yytext+1;
+ yytext[yyleng] = 0;
+# ifdef LEXDEBUG
+ if(debug){
+ fprintf(yyout,"\nmatch '%s'", yytext);
+ fprintf(yyout," action %d\n",*yyfnd);
+ }
+# endif
+ return(*yyfnd++);
+ }
+ unput(*yylastch);
+ }
+ if (yytext[0] == 0 /* && feof(yyin) */)
+ {
+ yysptr=yysbuf;
+ return(0);
+ }
+ yyprevious = input();
+ yytext[0] = yyprevious;
+ if (yyprevious>0)
+ output(yyprevious);
+ yylastch = (Uchar*)yytext;
+# ifdef LEXDEBUG
+ if(debug)putchar('\n');
+# endif
+ }
+ return(0); /* shut up the compiler; i have no idea what should be returned */
+ }
+int
+yyback(int *p, int m)
+{
+if (p==0) return(0);
+while (*p)
+ {
+ if (*p++ == m)
+ return(1);
+ }
+return(0);
+}
+ /* the following are only used in the lex library */
+int
+yyinput(void){
+ if(yyin == ((void*)0))
+ yyin = stdin;
+ return(input());
+}
+void
+yyoutput(int c)
+{
+ if(yyout == ((void*)0))
+ yyout = stdin;
+ output(c);
+}
+void
+yyunput(int c)
+{
+ unput(c);
+}