ref: c3ba64f6935322f09b6de5c2285544fd471c605d
dir: /sys/src/cmd/pic/picl.lx/
%Start A str def sc br thru sh
%e 1700
%k 120
%a 1800
%o 1500
%p 5000
%n 700
%{
#undef input
#undef unput
/* #include <stdio.h> lex puts one out for us */
#include <ctype.h>
#include <stdlib.h>
#include "pic.h"
#include "y.tab.h"
extern char *filename;
extern struct symtab symtab[];
void pbstr(char *);
void dodef(struct symtab *stp);
void undefine(char *s);
void shell_init(void), shell_exec(void), shell_text(char *);
void endfor(void);
int yyback(int *, int);
int yylook(void);
int yywrap(void);
#define CADD cbuf[clen++]=yytext[0]; \
if (clen>=CBUFLEN-1) { ERROR "string too long", cbuf WARNING; BEGIN A; }
#define CBUFLEN 500
char cbuf[CBUFLEN];
int c, clen, cflag, delim;
int ifsw = 0; /* 1 if if statement in progress */
%}
A [a-zA-Z_]
B [a-zA-Z0-9_]
D [0-9]
WS [ \t]
%%
switch (yybgin-yysvec-1) { /* witchcraft */
case 0:
BEGIN A;
break;
case sc:
BEGIN A;
return('}');
case br:
BEGIN A;
return(']');
}
<A>{WS} ;
<A>"\\"\n ;
<A>\n { return(ST); }
<A>";" { return(ST); }
<A>"}" { BEGIN sc; return(ST); }
<A>"]" { BEGIN br; return(ST); }
<A>"{"{WS}*(#.*)?\n+ { return(yylval.i = yytext[0]); }
<A>^".PS".* { if (curfile == infile) ERROR ".PS found inside .PS/.PE" WARNING; }
<A>^".PE".* { if (curfile == infile) {
yylval.p = PEstring = tostring(yytext);
return(EOF);
}
}
<A>^".".* { yylval.p = tostring(yytext); return(TROFF); }
<A>print return(yylval.i = PRINT);
<A>box return(yylval.i = BOX);
<A>circle return(yylval.i = CIRCLE);
<A>arc return(yylval.i = ARC);
<A>ellipse return(yylval.i = ELLIPSE);
<A>arrow return(yylval.i = ARROW);
<A>spline return(yylval.i = SPLINE);
<A>line return(yylval.i = LINE);
<A>move return(yylval.i = MOVE);
<A>"[]" return(yylval.i = BLOCK);
<A>reset return(RESET);
<A>sprintf return(SPRINTF);
<A>same return(SAME);
<A>between return(BETWEEN);
<A>and return(AND);
<A>of ;
<A>the ;
<A>way ;
<A>"."(e|east) { yylval.i = EAST; return(CORNER); }
<A>"."(r|right) { yylval.i = EAST; return(CORNER); }
<A>"."(w|west) { yylval.i = WEST; return(CORNER); }
<A>"."(l|left) { yylval.i = WEST; return(CORNER); }
<A>"."(n|north) { yylval.i = NORTH; return(CORNER); }
<A>"."(t|top) { yylval.i = NORTH; return(CORNER); }
<A>"."(s|south) { yylval.i = SOUTH; return(CORNER); }
<A>"."(b|bot|bottom) { yylval.i = SOUTH; return(CORNER); }
<A>"."(c|center) { yylval.i = CENTER; return(CORNER); }
<A>".start" { yylval.i = START; return(CORNER); }
<A>".end" { yylval.i = END; return(CORNER); }
<A>".ne" { yylval.i = NE; return(CORNER); }
<A>".se" { yylval.i = SE; return(CORNER); }
<A>".nw" { yylval.i = NW; return(CORNER); }
<A>".sw" { yylval.i = SW; return(CORNER); }
<A>top" "+of { yylval.i = NORTH; return(CORNER); }
<A>north" "+of { yylval.i = NORTH; return(CORNER); }
<A>bottom" "+of { yylval.i = SOUTH; return(CORNER); }
<A>south" "+of { yylval.i = SOUTH; return(CORNER); }
<A>left" "+of { yylval.i = WEST; return(CORNER); }
<A>west" "+of { yylval.i = WEST; return(CORNER); }
<A>right" "+of { yylval.i = EAST; return(CORNER); }
<A>east" "+of { yylval.i = EAST; return(CORNER); }
<A>center" "+of { yylval.i = CENTER; return(CORNER); }
<A>start" "+of { yylval.i = START; return(CORNER); }
<A>end" "+of { yylval.i = END; return(CORNER); }
<A>height|ht { yylval.i = HEIGHT; return(ATTR); }
<A>width|wid { yylval.i = WIDTH; return(ATTR); }
<A>radius|rad { yylval.i = RADIUS; return(ATTR); }
<A>diameter|diam { yylval.i = DIAMETER; return(ATTR); }
<A>size { yylval.i = SIZE; return(ATTR); }
<A>left { yylval.i = LEFT; return(DIR); }
<A>right { yylval.i = RIGHT; return(DIR); }
<A>up { yylval.i = UP; return(DIR); }
<A>down { yylval.i = DOWN; return(DIR); }
<A>cw { yylval.i = CW; return(ATTR); }
<A>clockwise { yylval.i = CW; return(ATTR); }
<A>ccw { yylval.i = CCW; return(ATTR); }
<A>invis(ible)? { yylval.i = INVIS; return(ATTR); }
<A>noedge { yylval.i = INVIS; return ATTR; }
<A>fill return(yylval.i = FILL);
<A>solid ;
<A>dot(ted)? return(yylval.i = DOT);
<A>dash(ed)? return(yylval.i = DASH);
<A>chop return(yylval.i = CHOP);
<A>spread { yylval.i = SPREAD; return TEXTATTR; }
<A>ljust { yylval.i = LJUST; return TEXTATTR; }
<A>rjust { yylval.i = RJUST; return TEXTATTR; }
<A>above { yylval.i = ABOVE; return TEXTATTR; }
<A>below { yylval.i = BELOW; return TEXTATTR; }
<A>center { yylval.i = CENTER; return TEXTATTR; }
<A>"<-" { yylval.i = HEAD1; return(HEAD); }
<A>"->" { yylval.i = HEAD2; return(HEAD); }
<A>"<->" { yylval.i = HEAD12; return(HEAD); }
<A>".x" return(yylval.i = DOTX);
<A>".y" return(yylval.i = DOTY);
<A>"."(ht|height) return(yylval.i = DOTHT);
<A>"."(wid|width) return(yylval.i = DOTWID);
<A>"."(rad|radius) return(yylval.i = DOTRAD);
<A>from return(yylval.i = FROM);
<A>to return(yylval.i = TO);
<A>at return(yylval.i = AT);
<A>by return(yylval.i = BY);
<A>with return(yylval.i = WITH);
<A>last return(yylval.i = LAST);
<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>"==" return(EQ);
<A>">=" return(GE);
<A>"<=" return(LE);
<A>"!=" return(NEQ);
<A>">" return(GT);
<A>"<" return(LT);
<A>"&&" return(ANDAND);
<A>"||" return(OROR);
<A>"!" return(NOT);
<A>Here return(yylval.i = HERE);
<A>for return(FOR);
<A>^Endfor\n { endfor(); }
<A>do { yylval.p = delimstr("loop body"); return(DOSTR); }
<A>copy|include return(COPY);
<A>(thru|through){WS}+ { BEGIN thru; return(THRU); }
<thru>{A}{B}*|. { yylval.st = copythru(yytext); BEGIN A; return(DEFNAME); }
<A>until return(UNTIL);
<A>if { ifsw = 1; return(IF); }
<A>then { if (!ifsw) { yylval.i = THEN; return(ATTR); }
yylval.p = delimstr("then part"); ifsw = 0;
return(THENSTR); }
<A>else { yylval.p = delimstr("else part"); return(ELSESTR); }
<A>sh{WS}+ { BEGIN sh;
if ((delim = input()) == '{') delim = '}'; /* no nested {} */
shell_init(); }
<sh>{A}{B}* { struct symtab *p;
if (yytext[0] == delim) {
shell_exec();
BEGIN A;
} else {
p = lookup(yytext);
if (p != NULL && p->s_type == DEFNAME) {
c = input();
unput(c);
if (c == '(')
dodef(p);
else
pbstr(p->s_val.p);
} else
shell_text(yytext);
}
}
<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>undef(ine)?{WS}+{A}{B}* { undefine(yytext); }
<A>first { yylval.i = 1; return(NTH); }
<A>{D}+(th|nd|rd|st) { yylval.i = atoi(yytext); return(NTH); }
<A>({D}+("."?){D}*|"."{D}+)((e|E)("+"|-)?{D}+)?i? {
yylval.f = atof(yytext); return(NUMBER); }
<A>{A}{B}* { struct symtab *p;
p = lookup(yytext);
if (p != NULL && p->s_type == DEFNAME) {
c = input();
unput(c);
if (c == '(') /* it's name(...) */
dodef(p);
else { /* no argument list */
pbstr(p->s_val.p);
dprintf("pushing back `%s'\n", p->s_val.p);
}
} else if (islower(yytext[0])) {
yylval.p = tostring(yytext);
return(VARNAME);
} else {
yylval.p = tostring(yytext);
return(PLACENAME);
}
}
<A>\" { BEGIN str; clen=0; }
<str>\" { cbuf[clen]=0; yylval.p = tostring(cbuf); BEGIN A; return(TEXT); }
<str>\n { cbuf[clen]=0; ERROR "missing quote in string \"%s\"", cbuf WARNING;
BEGIN A; return(ST); }
<str>"\\\"" { cbuf[clen++]='"'; }
<str>"\\"t { cbuf[clen++]='\t'; }
<str>"\\\\" { cbuf[clen++]='\\'; }
<str>. { CADD; }
<A>#.* ;
<A>. return(yylval.i = yytext[0]);
%%