| 1 | %{ |
| 2 | open Printf |
| 3 | %} |
| 4 | |
| 5 | /* Declarations */ |
| 6 | %token AND |
| 7 | %token ARRAY |
| 8 | %token ASSIGN |
| 9 | %token BREAK |
| 10 | %token COLON |
| 11 | %token COMMA |
| 12 | %token DIVIDE |
| 13 | %token DO |
| 14 | %token DOT |
| 15 | %token ELSE |
| 16 | %token END |
| 17 | %token EOF |
| 18 | %token EQ |
| 19 | %token FOR |
| 20 | %token FUNCTION |
| 21 | %token GE |
| 22 | %token GT |
| 23 | %token <string> ID |
| 24 | %token IF |
| 25 | %token IN |
| 26 | %token <int> INT |
| 27 | %token LBRACE |
| 28 | %token LBRACK |
| 29 | %token LE |
| 30 | %token LET |
| 31 | %token LPAREN |
| 32 | %token LT |
| 33 | %token MINUS |
| 34 | %token NEQ |
| 35 | %token NIL |
| 36 | %token OF |
| 37 | %token OR |
| 38 | %token PLUS |
| 39 | %token RBRACE |
| 40 | %token RBRACK |
| 41 | %token RPAREN |
| 42 | %token SEMICOLON |
| 43 | %token <string> STRING |
| 44 | %token THEN |
| 45 | %token TIMES |
| 46 | %token TO |
| 47 | %token TYPE |
| 48 | %token VAR |
| 49 | %token WHILE |
| 50 | |
| 51 | /* from lowest precedence */ |
| 52 | %left OR |
| 53 | %left AND |
| 54 | %nonassoc EQ NEQ GT LT GE LE |
| 55 | %left PLUS MINUS |
| 56 | %left TIMES DIVIDE |
| 57 | %nonassoc UMINUS |
| 58 | /* to highest precedence */ |
| 59 | |
| 60 | %type <string> program |
| 61 | |
| 62 | %start program |
| 63 | |
| 64 | %% |
| 65 | |
| 66 | program: |
| 67 | | exp EOF |
| 68 | { |
| 69 | sprintf "program[%s]" $1 |
| 70 | } |
| 71 | |
| 72 | exp: |
| 73 | | NIL |
| 74 | { |
| 75 | "nil[]" |
| 76 | } |
| 77 | | INT |
| 78 | { |
| 79 | sprintf "int[%d]" $1 |
| 80 | } |
| 81 | | MINUS exp %prec UMINUS |
| 82 | { |
| 83 | sprintf "negation[%s]" $2 |
| 84 | } |
| 85 | | type_id LBRACK exp RBRACK OF exp |
| 86 | { |
| 87 | sprintf "array[type[%s], size[%s], val[%s]]" $1 $3 $6 |
| 88 | } |
| 89 | | type_id LBRACE rec_field_assignments RBRACE |
| 90 | { |
| 91 | sprintf "record[type[%s], rec_field_assignments[%s]]" $1 $3 |
| 92 | } |
| 93 | | lvalue |
| 94 | { |
| 95 | $1 |
| 96 | } |
| 97 | | lvalue ASSIGN exp |
| 98 | { |
| 99 | sprintf "assign[%s := %s]" $1 $3 |
| 100 | } |
| 101 | | STRING |
| 102 | { |
| 103 | sprintf "string[%S]" $1 |
| 104 | } |
| 105 | | fun_call |
| 106 | { |
| 107 | $1 |
| 108 | } |
| 109 | | exp op exp |
| 110 | { |
| 111 | sprintf "op[%s %s %s]" $1 $2 $3 |
| 112 | } |
| 113 | | IF exp THEN exp ELSE exp |
| 114 | { |
| 115 | let e1 = $2 in |
| 116 | let e2 = $4 in |
| 117 | let e3 = $6 in |
| 118 | sprintf "if_then_else[%s, then[%s], else[%s]]" e1 e2 e3 |
| 119 | } |
| 120 | | IF exp THEN exp |
| 121 | { |
| 122 | sprintf "if_then[%s, then[%s]]" $2 $4 |
| 123 | } |
| 124 | | WHILE exp DO exp |
| 125 | { |
| 126 | sprintf "while[%s, do[%s]]" $2 $4 |
| 127 | } |
| 128 | | FOR id ASSIGN exp TO exp DO exp |
| 129 | { |
| 130 | let id = $2 in |
| 131 | let e1 = $4 in |
| 132 | let e2 = $6 in |
| 133 | let e3 = $8 in |
| 134 | sprintf "for[%s := %s, to[%s], do[%s]]" id e1 e2 e3 |
| 135 | } |
| 136 | | BREAK |
| 137 | { |
| 138 | "break[]" |
| 139 | } |
| 140 | | LPAREN seq RPAREN |
| 141 | { |
| 142 | sprintf "seq[%s]" $2 |
| 143 | } |
| 144 | | LET decs IN seq END |
| 145 | { |
| 146 | let decs = $2 in |
| 147 | let seq = $4 in |
| 148 | sprintf "let[decs[%s], in[seq[%s]]]" decs seq |
| 149 | } |
| 150 | | unit |
| 151 | { |
| 152 | $1 |
| 153 | } |
| 154 | |
| 155 | seq: |
| 156 | | exp |
| 157 | { |
| 158 | sprintf "%s" $1 |
| 159 | } |
| 160 | | exp SEMICOLON seq |
| 161 | { |
| 162 | sprintf "%s; %s" $1 $3 |
| 163 | } |
| 164 | |
| 165 | decs: |
| 166 | | dec |
| 167 | { |
| 168 | sprintf "%s" $1 |
| 169 | } |
| 170 | | dec decs |
| 171 | { |
| 172 | sprintf "%s %s" $1 $2 |
| 173 | } |
| 174 | |
| 175 | dec: |
| 176 | | tydec {$1} |
| 177 | | vardec {$1} |
| 178 | | fundec {$1} |
| 179 | |
| 180 | fundec: |
| 181 | | FUNCTION id LPAREN tyfields RPAREN EQ exp |
| 182 | { |
| 183 | let id = $2 in |
| 184 | let tyfields = $4 in |
| 185 | let exp = $7 in |
| 186 | sprintf "fundec[%s, tyfields[%s], exp[%s]]" id tyfields exp |
| 187 | } |
| 188 | | FUNCTION id LPAREN tyfields RPAREN COLON type_id EQ exp |
| 189 | { |
| 190 | let id = $2 in |
| 191 | let tyfields = $4 in |
| 192 | let type_id = $7 in |
| 193 | let exp = $9 in |
| 194 | sprintf |
| 195 | "fundec[%s, tyfields[%s], type_id[%s], exp[%s]]" |
| 196 | id tyfields type_id exp |
| 197 | } |
| 198 | |
| 199 | vardec: |
| 200 | | VAR id ASSIGN exp |
| 201 | { |
| 202 | let id = $2 in |
| 203 | let exp = $4 in |
| 204 | sprintf "vardec[%s, exp[%s]]" id exp |
| 205 | } |
| 206 | | VAR id COLON type_id ASSIGN exp |
| 207 | { |
| 208 | let id = $2 in |
| 209 | let tyid = $4 in |
| 210 | let exp = $6 in |
| 211 | sprintf "vardec[%s, type_id[%s], exp[%s]]" id tyid exp |
| 212 | } |
| 213 | |
| 214 | tydec: |
| 215 | | TYPE type_id EQ ty |
| 216 | { |
| 217 | sprintf "tydec[%s, %s]" $2 $4 |
| 218 | } |
| 219 | |
| 220 | ty: |
| 221 | | type_id |
| 222 | {$1} |
| 223 | | LBRACE RBRACE |
| 224 | { |
| 225 | "record[]" |
| 226 | } |
| 227 | | LBRACE tyfields RBRACE |
| 228 | { |
| 229 | let tyfields = $2 in |
| 230 | sprintf "record[%s]" tyfields |
| 231 | } |
| 232 | | ARRAY OF type_id |
| 233 | { |
| 234 | let type_id = $3 in |
| 235 | sprintf "array_of_type[%s]" type_id |
| 236 | } |
| 237 | |
| 238 | tyfields: |
| 239 | /*| epsilon */ |
| 240 | | tyfield |
| 241 | {$1} |
| 242 | | tyfield COMMA tyfields |
| 243 | { |
| 244 | let tyfield = $1 in |
| 245 | let tyfields = $3 in |
| 246 | sprintf "%s, %s" tyfield tyfields |
| 247 | } |
| 248 | |
| 249 | tyfield: |
| 250 | | id COLON type_id |
| 251 | { |
| 252 | let id = $1 in |
| 253 | let type_id = $3 in |
| 254 | sprintf "tyfield[%s, %s]" id type_id |
| 255 | } |
| 256 | |
| 257 | id: |
| 258 | | ID |
| 259 | { |
| 260 | sprintf "id[%S]" $1 |
| 261 | } |
| 262 | |
| 263 | /* Perhaps "void"? */ |
| 264 | unit: |
| 265 | | LPAREN RPAREN |
| 266 | { |
| 267 | "unit[]" |
| 268 | } |
| 269 | |
| 270 | type_id: |
| 271 | | id |
| 272 | { |
| 273 | sprintf "type_id[%S]" $1 |
| 274 | } |
| 275 | |
| 276 | rec_field_assignments: |
| 277 | | id EQ exp |
| 278 | { |
| 279 | sprintf "%S = %s" $1 $3 |
| 280 | } |
| 281 | | id EQ exp COMMA rec_field_assignments |
| 282 | { |
| 283 | sprintf "%S = %s, %s" $1 $3 $5 |
| 284 | } |
| 285 | |
| 286 | fun_call: |
| 287 | | id unit |
| 288 | { |
| 289 | sprintf "fun_call[%s, %s]" $1 $2 |
| 290 | } |
| 291 | | id LPAREN fun_args RPAREN |
| 292 | { |
| 293 | sprintf "fun_call[%s, %s]" $1 $3 |
| 294 | } |
| 295 | |
| 296 | fun_args: |
| 297 | | exp |
| 298 | { |
| 299 | $1 |
| 300 | } |
| 301 | | exp COMMA fun_args |
| 302 | { |
| 303 | sprintf "%s, %s" $1 $3 |
| 304 | } |
| 305 | |
| 306 | op: |
| 307 | | PLUS {"+"} |
| 308 | | MINUS {"-"} |
| 309 | | TIMES {"*"} |
| 310 | | DIVIDE {"/"} |
| 311 | | EQ {"="} |
| 312 | | NEQ {"<>"} |
| 313 | | GT {">"} |
| 314 | | LT {"<"} |
| 315 | | GE {">="} |
| 316 | | LE {"<="} |
| 317 | | AND {"&"} |
| 318 | | OR {"|"} |
| 319 | |
| 320 | lvalue: |
| 321 | | id |
| 322 | { |
| 323 | sprintf "lvalue[%s]" $1 |
| 324 | } |
| 325 | | lvalue DOT id |
| 326 | { |
| 327 | sprintf "get_record_field[%s, %s]" $1 $3 |
| 328 | } |
| 329 | | lvalue LBRACK exp RBRACK |
| 330 | { |
| 331 | sprintf "get_array_subscript[%s, %s]" $1 $3 |
| 332 | } |
| 333 | |
| 334 | %% |