plan9port

grapl.lx (4833B)

---

 %Start A str def thru sh
 
 %{
 #undef	input
 #undef	unput
 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
 #include "grap.h"
 #include "y.tab.h"
 
 int	yyback(int *, int);
 int	yylook(void);
 int	yywrap(void);
 void	shell_init(void), shell_exec(void), shell_text(char *);
 
 #define	CADD	cbuf[clen++] = yytext[0]; \
 		if (clen >= CBUFLEN-1) { \
 			ERROR "string too long" WARNING; BEGIN A; }
 #define	CBUFLEN	1500
 char	cbuf[CBUFLEN];
 int	clen, cflag;
 int	c, delim, shcnt;
 %}
 
 A	[a-zA-Z_]
 B	[a-zA-Z0-9_]
 D	[0-9]
 WS	[ \t]
 
 %%
 	if (yybgin-yysvec-1 == 0) {	/* witchcraft */
 		BEGIN A;
 	}
 
 <A>{WS}		;
 <A>"\\"\n	;
 <A>\n		return(ST);
 <A>";"		return(ST);
 
 <A>line		return(yylval.i = LINE);
 <A>arrow	{ yylval.i = ARROW; return(LINE); }
 <A>circle	return(yylval.i = CIRCLE);
 <A>frame	return(FRAME);
 <A>tick(s)?	return(TICKS);
 <A>grid(line)?(s)?	return(GRID);
 <A>coord(s)?	return(COORD);
 <A>log		return(LOG);
 <A>exp		return(EXP);
 <A>sin		return(SIN);
 <A>cos		return(COS);
 <A>atan2	return(ATAN2);
 <A>sqrt		return(SQRT);
 <A>rand		return(RAND);
 <A>max		return(MAX);
 <A>min		return(MIN);
 <A>int		return(INT);
 <A>print	return(PRINT);
 <A>sprintf	return(SPRINTF);
 <A>pic{WS}.*	{ yylval.p = tostring(yytext+3); return(PIC); }
 <A>graph{WS}.*	{ yylval.p = tostring(yytext+5); return(GRAPH); }
 
 <A>for		return(FOR);
 <A>^Endfor\n	{ endfor(); }
 <A>do		{ yylval.p = delimstr("loop body"); BEGIN A; return(DOSTR); }
 
 <A>copy|include	{ return(COPY); }
 <A>thru|through	{ BEGIN thru; return(THRU); }
 <thru>{WS}+	;
 <thru>{A}{B}*|.	{ yylval.op = copythru(yytext); BEGIN A; return(DEFNAME); }
 <A>until	return(UNTIL);
 
 <A>if		return(IF);
 <A>then		{ yylval.p = delimstr("then part"); BEGIN A; return(THEN); }
 <A>else		{ yylval.p = delimstr("else part"); BEGIN A; return(ELSE); }
 
 <A>next		return(NEXT);
 <A>draw		return(yylval.i = DRAW);
 <A>new		return(yylval.i = NEW);
 <A>plot		return(yylval.i = PLOT);
 <A>label(s)?	return(LABEL);
 <A>x		return(X);
 <A>y		return(Y);
 
 <A>top		{ yylval.i = TOP; return SIDE; }
 <A>bot(tom)?	{ yylval.i = BOT; return SIDE; }
 <A>left		{ yylval.i = LEFT; return SIDE; }
 <A>right	{ yylval.i = RIGHT; return SIDE; }
 <A>up		return(yylval.i = UP);
 <A>down		return(yylval.i = DOWN);
 <A>across	return(yylval.i = ACROSS);
 <A>height|ht	return(yylval.i = HEIGHT);
 <A>wid(th)?	return(yylval.i = WIDTH);
 <A>rad(ius)?	return(yylval.i = RADIUS);
 <A>invis	return(yylval.i = INVIS);
 <A>dot(ted)	return(yylval.i = DOT);
 <A>dash(ed)	return(yylval.i = DASH);
 <A>solid	return(yylval.i = SOLID);
 
 <A>ljust	{ yylval.i = LJUST; return JUST; }
 <A>rjust	{ yylval.i = RJUST; return JUST; }
 <A>above	{ yylval.i = ABOVE; return JUST; }
 <A>below	{ yylval.i = BELOW; return JUST; }
 <A>size		return(yylval.i = SIZE);
 
 <A>from		return(yylval.i = FROM);
 <A>to		return(yylval.i = TO);
 <A>by|step	return(yylval.i = BY);
 <A>at		return(yylval.i = AT);
 <A>with		return(yylval.i = WITH);
 <A>in		return(yylval.i = IN);
 <A>out		return(yylval.i = OUT);
 <A>off		return(yylval.i = OFF);
 
 <A>sh{WS}+ {	BEGIN sh;
 		if ((delim = input()) == '{') {
 			shcnt = 1;
 			delim = '}';
 		}
 		shell_init();
 	}
 <sh>{A}{B}* {
 		int c;
 		Obj *p;
 		if (yytext[0] == delim) {
 			shell_exec();
 			BEGIN A;
 		} else {
 			p = lookup(yytext, 0);
 			if (p != NULL && p->type == DEFNAME) {
 				c = input();
 				unput(c);
 				if (c == '(')
 					dodef(p);
 				else
 					pbstr(p->val);
 			} else
 				shell_text(yytext);
 		}
 	}
 <sh>"{"		{ shcnt++; shell_text(yytext); }
 <sh>"}"		{ if (delim != '}' || --shcnt > 0)
 			shell_text(yytext);
 		  else {
 			shell_exec();
 			BEGIN A;
 		  }
 		}
 <sh>.|\n	{ if (yytext[0] == delim) {
 			shell_exec();
 			BEGIN A;
 		  } else
 			shell_text(yytext);
 		}
 
 <A>define{WS}+	{ BEGIN def; }
 <def>{A}{B}*	{ definition(yytext); BEGIN A; }
 
 <A>({D}+("."?){D}*|"."{D}+)((e|E)("+"|-)?{D}+)?i? {
 		  yylval.f = atof(yytext); return(NUMBER); }
 
 <A>^"."[^0-9].*	{ if (yytext[1] == 'G' && yytext[2] == '2') {
 			yylval.i = yytext[2];
 			return(EOF);
 		  } else {
 			yylval.p = tostring(yytext);
 			return(PIC);
 		  }
 		}
 
 <A>{A}{B}* {
 		int c;
 		Obj *p;
 		p = lookup(yytext, 1);
 		if (p->type == DEFNAME) {
 			c = input();
 			unput(c);
 			if (c == '(')	/* it's name(...) */
 				dodef(p);
 			else	/* no argument list */
 				pbstr(p->val);
 		} else {
 			yylval.op = p;
 			return p->type;	/* NAME or VARNAME */
 		}
 	}
 
 <A>"=="		return(EQ);
 <A>">="		return(GE);
 <A>"<="		return(LE);
 <A>"!="		return(NE);
 <A>">"		return(GT);
 <A>"<"		return(LT);
 <A>"&&"		return(AND);
 <A>"||"		return(OR);
 <A>"!"		return(NOT);	
 
 <A>\"		{ BEGIN str; clen = 0; }
 
 <A>#.*		;
 
 <A>.		{ yylval.i = yytext[0]; return(yytext[0]); }
 
 <str>\"		{ BEGIN A; cbuf[clen] = 0;
 		  yylval.p = tostring(cbuf); return(STRING); }
 <str>\n		{ ERROR "newline in string" WARNING; BEGIN A; return(ST); }
 <str>"\\\""	{ cbuf[clen++] = '\\'; cbuf[clen++] = '"'; }
 <str>"\\\\"	{ cbuf[clen++] = '\\'; cbuf[clen++] = '\\'; }
 <str>.		{ CADD; }
 
 %%