2.9BSD - /usr/src/cmd/eqn/e.y

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

Defined variables