ref: fe1eb39db7ae6904924f3ab1f6f9b34416f2eb1b
dir: /sys/src/cmd/pic/picy.y/
%{
#include <stdio.h>
#include "pic.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
YYSTYPE y;
extern void yyerror(char *);
extern int yylex(void);
%}
%token <i> BOX 1 /* DON'T CHANGE THESE! */
%token <i> LINE 2
%token <i> ARROW 3
%token <i> CIRCLE 4
%token <i> ELLIPSE 5
%token <i> ARC 6
%token <i> SPLINE 7
%token <i> BLOCK 8
%token <p> TEXT 9
%token <p> TROFF 10
%token <i> MOVE 11
%token <i> BLOCKEND 12
%token <i> PLACE 13
%token <i> PRINT RESET THRU UNTIL
%token <o> FOR IF COPY
%token <p> THENSTR ELSESTR DOSTR PLACENAME VARNAME SPRINTF
%token <st> DEFNAME
%token <i> ATTR TEXTATTR
%token <i> LEFT RIGHT UP DOWN FROM TO AT BY WITH HEAD CW CCW THEN
%token <i> HEIGHT WIDTH RADIUS DIAMETER LENGTH SIZE
%token <i> CORNER HERE LAST NTH SAME BETWEEN AND
%token <i> EAST WEST NORTH SOUTH NE NW SE SW START END
%token <i> DOTX DOTY DOTHT DOTWID DOTRAD
%token <f> NUMBER
%token <f> LOG EXP SIN COS ATAN2 SQRT RAND MIN MAX INT
%token <i> DIR
%token <i> DOT DASH CHOP FILL NOEDGE
%token <o> ST /* statement terminator */
%right <f> '='
%left <f> OROR
%left <f> ANDAND
%nonassoc <f> GT LT LE GE EQ NEQ
%left <f> '+' '-'
%left <f> '*' '/' '%'
%right <f> UMINUS NOT
%right <f> '^'
%type <f> expr if_expr asgn
%type <p> name text
%type <i> optop exprlist
%type <o> if for copy
/* this is a lie: picture and position are really the whole union */
%type <o> leftbrace picture piclist position lbracket
%type <o> prim place blockname
%type <i> textlist textattr /* not a sensible value */
%type <i> last type
%%
top:
piclist
| /* empty */
| error { ERROR "syntax error" WARNING; }
;
piclist:
picture
| piclist picture
;
picture:
prim ST { codegen = 1; makeiattr(0, 0); }
| leftbrace piclist '}' { rightthing($1, '}'); $$ = $2; }
| PLACENAME ':' picture { y.o=$3; makevar($1,PLACENAME,y); $$ = $3; }
| PLACENAME ':' ST picture { y.o=$4; makevar($1,PLACENAME,y); $$ = $4; }
| PLACENAME ':' position ST { y.o=$3; makevar($1,PLACENAME,y); $$ = $3; }
| asgn ST { y.f = $1; $$ = y.o; $$ = makenode(PLACE, 0); }
| DIR { setdir($1); $$ = makenode(PLACE, 0); }
| PRINT expr ST { printexpr($2); $$ = makenode(PLACE, 0); }
| PRINT position ST { printpos($2); $$ = makenode(PLACE, 0); }
| PRINT text ST { printf("%s\n", $2); free($2); $$ = makenode(PLACE, 0); }
| RESET varlist ST { resetvar(); makeiattr(0, 0); $$ = makenode(PLACE, 0); }
| copy
| for
| if
| ST
;
varlist:
/* empty */
| VARNAME { makevattr($1); }
| varlist VARNAME { makevattr($2); }
| varlist ',' VARNAME { makevattr($3); }
;
asgn:
VARNAME '=' expr { $$=y.f=$3; makevar($1,VARNAME,y); checkscale($1); }
;
copy:
COPY copylist { copy(); }
;
copylist:
copyattr
| copylist copyattr
;
copyattr:
text { copyfile($1); }
| THRU DEFNAME { copydef($2); }
| UNTIL text { copyuntil($2); }
;
for:
FOR name FROM expr TO expr BY optop expr DOSTR
{ forloop($2, $4, $6, $8, $9, $10); }
| FOR name FROM expr TO expr DOSTR
{ forloop($2, $4, $6, '+', 1.0, $7); }
| FOR name '=' expr TO expr BY optop expr DOSTR
{ forloop($2, $4, $6, $8, $9, $10); }
| FOR name '=' expr TO expr DOSTR
{ forloop($2, $4, $6, '+', 1.0, $7); }
;
if:
IF if_expr THENSTR ELSESTR { ifstat($2, $3, $4); }
| IF if_expr THENSTR { ifstat($2, $3, (char *) 0); }
;
if_expr:
expr
| text EQ text { $$ = strcmp($1,$3) == 0; free($1); free($3); }
| text NEQ text { $$ = strcmp($1,$3) != 0; free($1); free($3); }
;
name:
VARNAME { y.f = 0; makevar($1, VARNAME, y); }
;
optop:
'+' { $$ = '+'; }
| '-' { $$ = '-'; }
| '*' { $$ = '*'; }
| '/' { $$ = '/'; }
| /* empty */ { $$ = ' '; }
;
leftbrace:
'{' { $$ = leftthing('{'); }
;
prim:
BOX attrlist { $$ = boxgen(); }
| CIRCLE attrlist { $$ = circgen($1); }
| ELLIPSE attrlist { $$ = circgen($1); }
| ARC attrlist { $$ = arcgen($1); }
| LINE attrlist { $$ = linegen($1); }
| ARROW attrlist { $$ = linegen($1); }
| SPLINE attrlist { $$ = linegen($1); }
| MOVE attrlist { $$ = movegen(); }
| textlist attrlist { $$ = textgen(); }
| TROFF { $$ = troffgen($1); }
| lbracket piclist ']' { $<o>$=rightthing($1,']'); } attrlist
{ $$ = blockgen($1, $<o>4); }
;
lbracket:
'[' { $$ = leftthing('['); }
;
attrlist:
attrlist attr
| /* empty */
;
attr:
ATTR expr { makefattr($1, !DEFAULT, $2); }
| ATTR { makefattr($1, DEFAULT, 0.0); }
| expr { makefattr(curdir(), !DEFAULT, $1); }
| DIR expr { makefattr($1, !DEFAULT, $2); }
| DIR { makefattr($1, DEFAULT, 0.0); }
| FROM position { makeoattr($1, $2); }
| TO position { makeoattr($1, $2); }
| AT position { makeoattr($1, $2); }
| BY position { makeoattr($1, $2); }
| WITH CORNER { makeiattr(WITH, $2); }
| WITH '.' PLACENAME { makeoattr(PLACE, getblock(getlast(1,BLOCK), $3)); }
| WITH '.' PLACENAME CORNER
{ makeoattr(PLACE, getpos(getblock(getlast(1,BLOCK), $3), $4)); }
| WITH position { makeoattr(PLACE, $2); }
| SAME { makeiattr(SAME, $1); }
| TEXTATTR { maketattr($1, (char *) 0); }
| HEAD { makeiattr(HEAD, $1); }
| DOT expr { makefattr(DOT, !DEFAULT, $2); }
| DOT { makefattr(DOT, DEFAULT, 0.0); }
| DASH expr { makefattr(DASH, !DEFAULT, $2); }
| DASH { makefattr(DASH, DEFAULT, 0.0); }
| CHOP expr { makefattr(CHOP, !DEFAULT, $2); }
| CHOP { makefattr(CHOP, DEFAULT, 0.0); }
| CHOP PLACENAME { makeattr(CHOP, PLACENAME, getvar($2)); }
| FILL expr { makefattr(FILL, !DEFAULT, $2); }
| FILL { makefattr(FILL, DEFAULT, 0.0); }
| NOEDGE { makeiattr(NOEDGE, 0); }
| textlist
;
textlist:
textattr
| textlist textattr
;
textattr:
text { maketattr(CENTER, $1); }
| text TEXTATTR { maketattr($2, $1); }
| textattr TEXTATTR { addtattr($2); }
;
text:
TEXT
| SPRINTF '(' text ')' { $$ = sprintgen($3); }
| SPRINTF '(' text ',' exprlist ')' { $$ = sprintgen($3); }
;
exprlist:
expr { exprsave($1); $$ = 0; }
| exprlist ',' expr { exprsave($3); }
;
position: /* absolute, not relative */
place
| '(' position ')' { $$ = $2; }
| expr ',' expr { $$ = makepos($1, $3); }
| position '+' expr ',' expr { $$ = fixpos($1, $3, $5); }
| position '-' expr ',' expr { $$ = fixpos($1, -$3, -$5); }
| position '+' '(' expr ',' expr ')' { $$ = fixpos($1, $4, $6); }
| position '-' '(' expr ',' expr ')' { $$ = fixpos($1, -$4, -$6); }
| position '+' place { $$ = addpos($1, $3); }
| position '-' place { $$ = subpos($1, $3); }
| '(' place ',' place ')' { $$ = makepos(getcomp($2,DOTX), getcomp($4,DOTY)); }
| expr LT position ',' position GT { $$ = makebetween($1, $3, $5); }
| expr BETWEEN position AND position { $$ = makebetween($1, $3, $5); }
;
place:
PLACENAME { y = getvar($1); $$ = y.o; }
| PLACENAME CORNER { y = getvar($1); $$ = getpos(y.o, $2); }
| CORNER PLACENAME { y = getvar($2); $$ = getpos(y.o, $1); }
| HERE { $$ = gethere(); }
| last type { $$ = getlast($1, $2); }
| last type CORNER { $$ = getpos(getlast($1, $2), $3); }
| CORNER last type { $$ = getpos(getlast($2, $3), $1); }
| NTH type { $$ = getfirst($1, $2); }
| NTH type CORNER { $$ = getpos(getfirst($1, $2), $3); }
| CORNER NTH type { $$ = getpos(getfirst($2, $3), $1); }
| blockname
| blockname CORNER { $$ = getpos($1, $2); }
| CORNER blockname { $$ = getpos($2, $1); }
;
blockname:
last BLOCK '.' PLACENAME { $$ = getblock(getlast($1,$2), $4); }
| NTH BLOCK '.' PLACENAME { $$ = getblock(getfirst($1,$2), $4); }
| PLACENAME '.' PLACENAME { y = getvar($1); $$ = getblock(y.o, $3); }
;
last:
last LAST { $$ = $1 + 1; }
| NTH LAST { $$ = $1; }
| LAST { $$ = 1; }
;
type:
BOX
| CIRCLE
| ELLIPSE
| ARC
| LINE
| ARROW
| SPLINE
| BLOCK
;
expr:
NUMBER
| VARNAME { $$ = getfval($1); }
| asgn
| expr '+' expr { $$ = $1 + $3; }
| expr '-' expr { $$ = $1 - $3; }
| expr '*' expr { $$ = $1 * $3; }
| expr '/' expr { if ($3 == 0.0) {
ERROR "division by 0" WARNING; $3 = 1; }
$$ = $1 / $3; }
| expr '%' expr { if ((long)$3 == 0) {
ERROR "mod division by 0" WARNING; $3 = 1; }
$$ = (long)$1 % (long)$3; }
| '-' expr %prec UMINUS { $$ = -$2; }
| '+' expr %prec UMINUS { $$ = $2; }
| '(' expr ')' { $$ = $2; }
| place DOTX { $$ = getcomp($1, $2); }
| place DOTY { $$ = getcomp($1, $2); }
| place DOTHT { $$ = getcomp($1, $2); }
| place DOTWID { $$ = getcomp($1, $2); }
| place DOTRAD { $$ = getcomp($1, $2); }
| PLACENAME '.' VARNAME { y = getvar($1); $$ = getblkvar(y.o, $3); }
| last BLOCK '.' VARNAME { $$ = getblkvar(getlast($1,$2), $4); }
| NTH BLOCK '.' VARNAME { $$ = getblkvar(getfirst($1,$2), $4); }
| expr GT expr { $$ = $1 > $3; }
| expr LT expr { $$ = $1 < $3; }
| expr LE expr { $$ = $1 <= $3; }
| expr GE expr { $$ = $1 >= $3; }
| expr EQ expr { $$ = $1 == $3; }
| expr NEQ expr { $$ = $1 != $3; }
| expr ANDAND expr { $$ = $1 && $3; }
| expr OROR expr { $$ = $1 || $3; }
| NOT expr { $$ = !($2); }
| LOG '(' expr ')' { $$ = Log10($3); }
| EXP '(' expr ')' { $$ = Exp($3 * log(10.0)); }
| expr '^' expr { $$ = pow($1, $3); }
| SIN '(' expr ')' { $$ = sin($3); }
| COS '(' expr ')' { $$ = cos($3); }
| ATAN2 '(' expr ',' expr ')' { $$ = atan2($3, $5); }
| SQRT '(' expr ')' { $$ = Sqrt($3); }
| RAND '(' ')' { $$ = (float)rand() / 32767.0; /* might be 2^31-1 */ }
| MAX '(' expr ',' expr ')' { $$ = $3 >= $5 ? $3 : $5; }
| MIN '(' expr ',' expr ')' { $$ = $3 <= $5 ? $3 : $5; }
| INT '(' expr ')' { $$ = (long) $3; }
;