4.3BSD - /usr/src/usr.bin/eqn/e.y

   1: %{#
   2: /*	e.y	4.1	83/02/11	*/
   3: #include "e.h"
   4: #
   5: int fromflg;
   6: %}
   7: %term   CONTIG QTEXT SPACE THIN TAB
   8: %term   MATRIX LCOL CCOL RCOL COL
   9: %term   MARK LINEUP
  10: %term   SUM INT PROD UNION INTER
  11: %term   LPILE PILE CPILE RPILE ABOVE
  12: %term   DEFINE TDEFINE NDEFINE DELIM GSIZE GFONT INCLUDE
  13: %right  FROM TO
  14: %left   OVER SQRT
  15: %right  SUP SUB
  16: %right  SIZE FONT ROMAN ITALIC BOLD FAT
  17: %right  UP DOWN BACK FWD
  18: %left   LEFT RIGHT
  19: %right  DOT DOTDOT HAT TILDE BAR UNDER VEC DYAD
  20: 
  21: %%
  22: 
  23: stuff   : eqn   { putout($1); }
  24:     | error { error(!FATAL, "syntax error"); }
  25:     |   { eqnreg = 0; }
  26:     ;
  27: 
  28: eqn : box
  29:     | eqn box   { eqnbox($1, $2, 0); }
  30:     | eqn lineupbox { eqnbox($1, $2, 1); }
  31:     | LINEUP    { lineup(0); }
  32:     ;
  33: 
  34: lineupbox: LINEUP box   { $$ = $2; lineup(1); }
  35:     ;
  36: 
  37: matrix  : MATRIX    { $$ = ct; } ;
  38: 
  39: collist : column
  40:     | collist column
  41:     ;
  42: 
  43: column  : lcol '{' list '}' { column('L', $1); }
  44:     | ccol '{' list '}' { column('C', $1); }
  45:     | rcol '{' list '}' { column('R', $1); }
  46:     | col '{' list '}'  { column('-', $1); }
  47:     ;
  48: 
  49: lcol    : LCOL      { $$ = ct++; } ;
  50: ccol    : CCOL      { $$ = ct++; } ;
  51: rcol    : RCOL      { $$ = ct++; } ;
  52: col : COL       { $$ = ct++; } ;
  53: 
  54: sbox    : sup box   %prec SUP   { $$ = $2; }
  55:     ;
  56: 
  57: tbox    : to box    %prec TO    { $$ = $2; }
  58:     |       %prec FROM  { $$ = 0; }
  59:     ;
  60: 
  61: box : box OVER box  { boverb($1, $3); }
  62:     | MARK box  { mark($2); }
  63:     | size box  %prec SIZE  { size($1, $2); }
  64:     | font box  %prec FONT  { font($1, $2); }
  65:     | FAT box   { fatbox($2); }
  66:     | SQRT box  { sqrt($2); }
  67:     | lpile '{' list '}'    { lpile('L', $1, ct); ct = $1; }
  68:     | cpile '{' list '}'    { lpile('C', $1, ct); ct = $1; }
  69:     | rpile '{' list '}'    { lpile('R', $1, ct); ct = $1; }
  70:     | pile '{' list '}' { lpile('-', $1, ct); ct = $1; }
  71:     | box sub box sbox  %prec SUB   { shift2($1, $3, $4); }
  72:     | box sub box       %prec SUB   { bshiftb($1, $2, $3); }
  73:     | box sup box       %prec SUP   { bshiftb($1, $2, $3); }
  74:     | int sub box sbox  %prec SUB   { integral($1, $3, $4); }
  75:     | int sub box       %prec SUB   { integral($1, $3, 0); }
  76:     | int sup box       %prec SUP   { integral($1, 0, $3); }
  77:     | int                   { integral($1, 0, 0); }
  78:     | left eqn right    { paren($1, $2, $3); }
  79:     | pbox
  80:     | box from box tbox %prec FROM  { fromto($1, $3, $4); fromflg=0; }
  81:     | box to box    %prec TO    { fromto($1, 0, $3); }
  82:     | box diacrit   { diacrit($1, $2); }
  83:     | fwd box   %prec UP    { move(FWD, $1, $2); }
  84:     | up box    %prec UP    { move(UP, $1, $2); }
  85:     | back box  %prec UP    { move(BACK, $1, $2); }
  86:     | down box  %prec UP    { move(DOWN, $1, $2); }
  87:     | matrix '{' collist '}'    { matrix($1); }
  88:     ;
  89: 
  90: int : INT   { setintegral(); }
  91:     ;
  92: 
  93: fwd : FWD text  { $$ = atoi((char *) $1); } ;
  94: up  : UP text   { $$ = atoi((char *) $1); } ;
  95: back    : BACK text { $$ = atoi((char *) $1); } ;
  96: down    : DOWN text { $$ = atoi((char *) $1); } ;
  97: 
  98: diacrit : HAT   { $$ = HAT; }
  99:     | VEC   { $$ = VEC; }
 100:     | DYAD  { $$ = DYAD; }
 101:     | BAR   { $$ = BAR; }
 102:     | UNDER { $$ = UNDER; } /* under bar */
 103:     | DOT   { $$ = DOT; }
 104:     | TILDE { $$ = TILDE; }
 105:     | DOTDOT    { $$ = DOTDOT; } /* umlaut = double dot */
 106:     ;
 107: 
 108: from    : FROM  { $$=ps; ps -= 3; fromflg = 1;
 109:         if(dbg)printf(".\tfrom: old ps %d, new ps %d, fflg %d\n", $$, ps, fromflg);
 110:         }
 111:     ;
 112: 
 113: to  : TO    { $$=ps; if(fromflg==0)ps -= 3;
 114:             if(dbg)printf(".\tto: old ps %d, new ps %d\n", $$, ps);
 115:         }
 116:     ;
 117: 
 118: left    : LEFT text { $$ = ((char *)$2)[0]; }
 119:     | LEFT '{'  { $$ = '{'; }
 120:     ;
 121: 
 122: right   : RIGHT text    { $$ = ((char *)$2)[0]; }
 123:     | RIGHT '}' { $$ = '}'; }
 124:     |       { $$ = 0; }
 125:     ;
 126: 
 127: list    : eqn   { lp[ct++] = $1; }
 128:     | list ABOVE eqn    { lp[ct++] = $3; }
 129:     ;
 130: 
 131: lpile   : LPILE { $$ = ct; } ;
 132: cpile   : CPILE { $$ = ct; } ;
 133: pile    : PILE  { $$ = ct; } ;
 134: rpile   : RPILE { $$ = ct; } ;
 135: 
 136: size    : SIZE text { $$ = ps; setsize((char *) $2); }
 137:     ;
 138: 
 139: font    : ROMAN     { setfont(ROM); }
 140:     | ITALIC    { setfont(ITAL); }
 141:     | BOLD      { setfont(BLD); }
 142:     | FONT text { setfont(((char *)$2)[0]); }
 143:     ;
 144: 
 145: sub : SUB   { shift(SUB); }
 146:     ;
 147: 
 148: sup : SUP   { shift(SUP); }
 149:     ;
 150: 
 151: pbox    : '{' eqn '}'   { $$ = $2; }
 152:     | QTEXT     { text(QTEXT, (char *) $1); }
 153:     | CONTIG    { text(CONTIG, (char *) $1); }
 154:     | SPACE     { text(SPACE, 0); }
 155:     | THIN      { text(THIN, 0); }
 156:     | TAB       { text(TAB, 0); }
 157:     | SUM       { funny(SUM); }
 158:     | PROD      { funny(PROD); }
 159:     | UNION     { funny(UNION); }
 160:     | INTER     { funny(INTER); }   /* intersection */
 161:     ;
 162: 
 163: text    : CONTIG
 164:     | QTEXT
 165:     ;
 166: 
 167: %%

Defined variables