1: /*	awk.g.y	4.1	82/05/07	*/
   2: 
   3: %token  FIRSTTOKEN  /*must be first*/
   4: %token  FINAL FATAL
   5: %token  LT LE GT GE EQ NE
   6: %token  MATCH NOTMATCH
   7: %token  APPEND
   8: %token  ADD MINUS MULT DIVIDE MOD UMINUS
   9: %token  ASSIGN ADDEQ SUBEQ MULTEQ DIVEQ MODEQ
  10: %token  JUMP
  11: %token  XBEGIN XEND
  12: %token  NL
  13: %token  PRINT PRINTF SPRINTF SPLIT
  14: %token  IF ELSE WHILE FOR IN NEXT EXIT BREAK CONTINUE
  15: %token  PROGRAM PASTAT PASTAT2
  16: 
  17: %right  ASGNOP
  18: %left   BOR
  19: %left   AND
  20: %left   NOT
  21: %left   NUMBER VAR ARRAY FNCN SUBSTR LSUBSTR INDEX
  22: %left   GETLINE
  23: %nonassoc RELOP MATCHOP
  24: %left   OR
  25: %left   STRING  DOT CCL NCCL CHAR
  26: %left   '(' '^' '$'
  27: %left   CAT
  28: %left   '+' '-'
  29: %left   '*' '/' '%'
  30: %left   STAR PLUS QUEST
  31: %left   POSTINCR PREINCR POSTDECR PREDECR INCR DECR
  32: %left   FIELD INDIRECT
  33: %token  LASTTOKEN   /* has to be last */
  34: 
  35: %{
  36: #include "awk.def"
  37: #ifndef DEBUG
  38: #	define    PUTS(x)
  39: #endif
  40: %}
  41: %%
  42: 
  43: program:
  44:       begin pa_stats end    { if (errorflag==0) winner = (node *)stat3(PROGRAM, $1, $2, $3); }
  45:     | error         { yyclearin; yyerror("bailing out"); }
  46:     ;
  47: 
  48: begin:
  49:       XBEGIN '{' stat_list '}'  { PUTS("XBEGIN list"); $$ = $3; }
  50:     | begin NL
  51:     |   { PUTS("empty XBEGIN"); $$ = (hack)nullstat; }
  52:     ;
  53: 
  54: end:
  55:       XEND '{' stat_list '}'    { PUTS("XEND list"); $$ = $3; }
  56:     | end NL
  57:     |   { PUTS("empty END"); $$ = (hack)nullstat; }
  58:     ;
  59: 
  60: compound_conditional:
  61:       conditional BOR conditional   { PUTS("cond||cond"); $$ = op2(BOR, $1, $3); }
  62:     | conditional AND conditional   { PUTS("cond&&cond"); $$ = op2(AND, $1, $3); }
  63:     | NOT conditional       { PUTS("!cond"); $$ = op1(NOT, $2); }
  64:     | '(' compound_conditional ')'  { $$ = $2; }
  65:     ;
  66: 
  67: compound_pattern:
  68:       pattern BOR pattern   { PUTS("pat||pat"); $$ = op2(BOR, $1, $3); }
  69:     | pattern AND pattern   { PUTS("pat&&pat"); $$ = op2(AND, $1, $3); }
  70:     | NOT pattern       { PUTS("!pat"); $$ = op1(NOT, $2); }
  71:     | '(' compound_pattern ')'  { $$ = $2; }
  72:     ;
  73: 
  74: conditional:
  75:       expr  { PUTS("expr"); $$ = op2(NE, $1, valtonode(lookup("$zero&null", symtab, 0), CCON)); }
  76:     | rel_expr      { PUTS("relexpr"); }
  77:     | lex_expr      { PUTS("lexexpr"); }
  78:     | compound_conditional  { PUTS("compcond"); }
  79:     ;
  80: 
  81: else:
  82:       ELSE optNL    { PUTS("else"); }
  83:     ;
  84: 
  85: field:
  86:       FIELD     { PUTS("field"); $$ = valtonode($1, CFLD); }
  87:     | INDIRECT term { PUTS("ind field"); $$ = op1(INDIRECT, $2); }
  88:     ;
  89: 
  90: if:
  91:       IF '(' conditional ')' optNL  { PUTS("if(cond)"); $$ = $3; }
  92:     ;
  93: 
  94: lex_expr:
  95:       expr MATCHOP regular_expr { PUTS("expr~re"); $$ = op2($2, $1, makedfa($3)); }
  96:     | '(' lex_expr ')'  { PUTS("(lex_expr)"); $$ = $2; }
  97:     ;
  98: 
  99: var:
 100:       NUMBER    {PUTS("number"); $$ = valtonode($1, CCON); }
 101:     | STRING    { PUTS("string"); $$ = valtonode($1, CCON); }
 102:     | VAR       { PUTS("var"); $$ = valtonode($1, CVAR); }
 103:     | VAR '[' expr ']'  { PUTS("array[]"); $$ = op2(ARRAY, $1, $3); }
 104:     | field
 105:     ;
 106: term:
 107:       var
 108:     | GETLINE   { PUTS("getline"); $$ = op1(GETLINE, 0); }
 109:     | FNCN      { PUTS("func");
 110:             $$ = op2(FNCN, $1, valtonode(lookup("$record", symtab, 0), CFLD));
 111:             }
 112:     | FNCN '(' ')'  { PUTS("func()");
 113:             $$ = op2(FNCN, $1, valtonode(lookup("$record", symtab, 0), CFLD));
 114:             }
 115:     | FNCN '(' expr ')' { PUTS("func(expr)"); $$ = op2(FNCN, $1, $3); }
 116:     | SPRINTF print_list    { PUTS("sprintf"); $$ = op1($1, $2); }
 117:     | SUBSTR '(' expr ',' expr ',' expr ')'
 118:             { PUTS("substr(e,e,e)"); $$ = op3(SUBSTR, $3, $5, $7); }
 119:     | SUBSTR '(' expr ',' expr ')'
 120:             { PUTS("substr(e,e,e)"); $$ = op3(SUBSTR, $3, $5, nullstat); }
 121:     | SPLIT '(' expr ',' VAR ',' expr ')'
 122:             { PUTS("split(e,e,e)"); $$ = op3(SPLIT, $3, $5, $7); }
 123:     | SPLIT '(' expr ',' VAR ')'
 124:             { PUTS("split(e,e,e)"); $$ = op3(SPLIT, $3, $5, nullstat); }
 125:     | INDEX '(' expr ',' expr ')'
 126:             { PUTS("index(e,e)"); $$ = op2(INDEX, $3, $5); }
 127:     | '(' expr ')'          {PUTS("(expr)");  $$ = $2; }
 128:     | term '+' term         { PUTS("t+t"); $$ = op2(ADD, $1, $3); }
 129:     | term '-' term         { PUTS("t-t"); $$ = op2(MINUS, $1, $3); }
 130:     | term '*' term         { PUTS("t*t"); $$ = op2(MULT, $1, $3); }
 131:     | term '/' term         { PUTS("t/t"); $$ = op2(DIVIDE, $1, $3); }
 132:     | term '%' term         { PUTS("t%t"); $$ = op2(MOD, $1, $3); }
 133:     | '-' term %prec QUEST      { PUTS("-term"); $$ = op1(UMINUS, $2); }
 134:     | '+' term %prec QUEST      { PUTS("+term"); $$ = $2; }
 135:     | INCR var  { PUTS("++var"); $$ = op1(PREINCR, $2); }
 136:     | DECR var  { PUTS("--var"); $$ = op1(PREDECR, $2); }
 137:     | var INCR  { PUTS("var++"); $$= op1(POSTINCR, $1); }
 138:     | var DECR  { PUTS("var--"); $$= op1(POSTDECR, $1); }
 139:     ;
 140: 
 141: expr:
 142:       term      { PUTS("term"); }
 143:     | expr term { PUTS("expr term"); $$ = op2(CAT, $1, $2); }
 144:     | var ASGNOP expr   { PUTS("var=expr"); $$ = stat2($2, $1, $3); }
 145:     ;
 146: 
 147: optNL:
 148:       NL
 149:     |
 150:     ;
 151: 
 152: pa_stat:
 153:       pattern   { PUTS("pattern"); $$ = stat2(PASTAT, $1, genprint()); }
 154:     | pattern '{' stat_list '}' { PUTS("pattern {...}"); $$ = stat2(PASTAT, $1, $3); }
 155:     | pattern ',' pattern       { PUTS("srch,srch"); $$ = pa2stat($1, $3, genprint()); }
 156:     | pattern ',' pattern '{' stat_list '}'
 157:                     { PUTS("srch, srch {...}"); $$ = pa2stat($1, $3, $5); }
 158:     | '{' stat_list '}' { PUTS("null pattern {...}"); $$ = stat2(PASTAT, nullstat, $2); }
 159:     ;
 160: 
 161: pa_stats:
 162:       pa_stats pa_stat st   { PUTS("pa_stats pa_stat"); $$ = linkum($1, $2); }
 163:     |   { PUTS("null pa_stat"); $$ = (hack)nullstat; }
 164:     | pa_stats pa_stat  {PUTS("pa_stats pa_stat"); $$ = linkum($1, $2); }
 165:     ;
 166: 
 167: pattern:
 168:       regular_expr  { PUTS("regex");
 169:         $$ = op2(MATCH, valtonode(lookup("$record", symtab, 0), CFLD), makedfa($1));
 170:         }
 171:     | rel_expr  { PUTS("relexpr"); }
 172:     | lex_expr  { PUTS("lexexpr"); }
 173:     | compound_pattern  { PUTS("comp pat"); }
 174:     ;
 175: 
 176: print_list:
 177:       expr  { PUTS("expr"); }
 178:     | pe_list   { PUTS("pe_list"); }
 179:     |       { PUTS("null print_list"); $$ = valtonode(lookup("$record", symtab, 0), CFLD); }
 180:     ;
 181: 
 182: pe_list:
 183:       expr ',' expr {$$ = linkum($1, $3); }
 184:     | pe_list ',' expr  {$$ = linkum($1, $3); }
 185:     | '(' pe_list ')'       {$$ = $2; }
 186:     ;
 187: 
 188: redir:
 189:       RELOP
 190:     | '|'
 191:     ;
 192: 
 193: regular_expr:
 194:       '/'   { startreg(); }
 195:       r '/'
 196:         { PUTS("/r/"); $$ = $3; }
 197:     ;
 198: 
 199: r:
 200:       CHAR      { PUTS("regex CHAR"); $$ = op2(CHAR, (node *) 0, $1); }
 201:     | DOT       { PUTS("regex DOT"); $$ = op2(DOT, (node *) 0, (node *) 0); }
 202:     | CCL       { PUTS("regex CCL"); $$ = op2(CCL, (node *) 0, cclenter($1)); }
 203:     | NCCL      { PUTS("regex NCCL"); $$ = op2(NCCL, (node *) 0, cclenter($1)); }
 204:     | '^'       { PUTS("regex ^"); $$ = op2(CHAR, (node *) 0, HAT); }
 205:     | '$'       { PUTS("regex $"); $$ = op2(CHAR, (node *) 0 ,(node *) 0); }
 206:     | r OR r    { PUTS("regex OR"); $$ = op2(OR, $1, $3); }
 207:     | r r   %prec CAT
 208:             { PUTS("regex CAT"); $$ = op2(CAT, $1, $2); }
 209:     | r STAR    { PUTS("regex STAR"); $$ = op2(STAR, $1, (node *) 0); }
 210:     | r PLUS    { PUTS("regex PLUS"); $$ = op2(PLUS, $1, (node *) 0); }
 211:     | r QUEST   { PUTS("regex QUEST"); $$ = op2(QUEST, $1, (node *) 0); }
 212:     | '(' r ')' { PUTS("(regex)"); $$ = $2; }
 213:     ;
 214: 
 215: rel_expr:
 216:       expr RELOP expr
 217:         { PUTS("expr relop expr"); $$ = op2($2, $1, $3); }
 218:     | '(' rel_expr ')'
 219:         { PUTS("(relexpr)"); $$ = $2; }
 220:     ;
 221: 
 222: st:
 223:       NL
 224:     | ';'
 225:     ;
 226: 
 227: simple_stat:
 228:       PRINT print_list redir expr
 229:         { PUTS("print>stat"); $$ = stat3($1, $2, $3, $4); }
 230:     | PRINT print_list
 231:         { PUTS("print list"); $$ = stat3($1, $2, nullstat, nullstat); }
 232:     | PRINTF print_list redir expr
 233:         { PUTS("printf>stat"); $$ = stat3($1, $2, $3, $4); }
 234:     | PRINTF print_list
 235:         { PUTS("printf list"); $$ = stat3($1, $2, nullstat, nullstat); }
 236:     | expr  { PUTS("expr"); $$ = exptostat($1); }
 237:     |       { PUTS("null simple statement"); $$ = (hack)nullstat; }
 238:     | error     { yyclearin; yyerror("illegal statement"); }
 239:     ;
 240: 
 241: statement:
 242:       simple_stat st    { PUTS("simple stat"); }
 243:     | if statement      { PUTS("if stat"); $$ = stat3(IF, $1, $2, nullstat); }
 244:     | if statement else statement
 245:         { PUTS("if-else stat"); $$ = stat3(IF, $1, $2, $4); }
 246:     | while statement   { PUTS("while stat"); $$ = stat2(WHILE, $1, $2); }
 247:     | for           { PUTS("for stat"); }
 248:     | NEXT st       { PUTS("next"); $$ = stat1(NEXT, 0); }
 249:     | EXIT st       { PUTS("exit"); $$ = stat1(EXIT, 0); }
 250:     | EXIT expr st      { PUTS("exit"); $$ = stat1(EXIT, $2); }
 251:     | BREAK st      { PUTS("break"); $$ = stat1(BREAK, 0); }
 252:     | CONTINUE st       { PUTS("continue"); $$ = stat1(CONTINUE, 0); }
 253:     | '{' stat_list '}' { PUTS("{statlist}"); $$ = $2; }
 254:     ;
 255: 
 256: stat_list:
 257:       stat_list statement   { PUTS("stat_list stat"); $$ = linkum($1, $2); }
 258:     |           { PUTS("null stat list"); $$ = (hack)nullstat; }
 259:     ;
 260: 
 261: while:
 262:       WHILE '(' conditional ')' optNL   { PUTS("while(cond)"); $$ = $3; }
 263:     ;
 264: 
 265: for:
 266:       FOR '(' simple_stat ';' conditional ';' simple_stat ')' optNL statement
 267:         { PUTS("for(e;e;e)"); $$ = stat4(FOR, $3, $5, $7, $10); }
 268:     | FOR '(' simple_stat ';'  ';' simple_stat ')' optNL statement
 269:         { PUTS("for(e;e;e)"); $$ = stat4(FOR, $3, nullstat, $6, $9); }
 270:     | FOR '(' VAR IN VAR ')' optNL statement
 271:         { PUTS("for(v in v)"); $$ = stat3(IN, $3, $5, $8); }
 272:     ;
 273: 
 274: %%

Defined macros

PUTS defined in line 38; used 102 times
Last modified: 1987-02-08
Generated: 2016-12-26
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