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|
%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; }
%%
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