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Up to [CSRG BSD Unix] / 42BSD / bin / awk|
Return to awk.g.y CVS log | Up to [CSRG BSD Unix] / 42BSD / bin / awk |
1.1 root 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: %%
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