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63 lines
1.6 KiB
63 lines
1.6 KiB
15 years ago
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/* Jaroslaw Staniek:
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TAKEN FROM his compiler's parser
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AS EXAMPLE FOR LUCIJAN'S KEXISQL PARSER */
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exp: exp3 { $$->prn(); }
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| exp OR exp3 { $$ = new NOpLog($1,OR,$3); $$->prn(); }
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;
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exp3: exp3n {/*default*/}
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| exp3 AND exp3n { $$ = new NOpLog($1,AND,$3); }
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;
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exp3n: exp2 {/*default*/}
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| NOT exp3n { $$ = new NOp1arg(NOT,$2); }
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;
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exp2: exp1 {/*default*/}
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| exp1 op_rel exp1 { $$ = new NOpRel($1,$2,$3); }
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;
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exp1: exp0 {/*default*/}
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| exp1 op_ar1 exp0 { $$ = new NOpAr($1,$2,$3); }
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;
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exp0: exp_poj {/*default*/}
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| exp0 op_ar0 exp_poj { $$ = new NOpAr($1,$2,$3); }
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;
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* prior.2 - relational oper. */
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op_rel: '=' { $$='='; }
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| '<' { $$='<'; }
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| '>' { $$='>'; }
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| "<=" { $$=REL_LESS_EQ; }
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| ">=" { $$=REL_GREAT_EQ; }
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| "<>" { $$=REL_NOT_EQ; }
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;
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/* prior.1 - arytmetic oper. +,- */
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op_ar1: '+' { $$='+'; }
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| '-' { $$='-'; }
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;
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/* prior.0 - arytmetic oper. *,/ */
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op_ar0: '*' { $$='*'; }
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| '/' { $$='/'; }
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;
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exp_single: single {/*default*/}
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| '(' exp ')' { /*$$=new NOp1arg(0, $2);*/ $$=$2; }
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| '-' exp_single %prec OP_MINUS { $$=new NOp1arg('-', $2); }
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| '+' exp_single %prec OP_PLUS { $$=new NOp1arg('+', $2); }
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;
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single: const {/*default*/}
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| variable {/*default*/ }
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| function_call {/*default*/}
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const: CONST_BOOL { $$ = new NConstBool(yylval.bval); }
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| CONST_INT { $$ = new NConstInt(yylval.ival); }
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| CONST_STR { $$ = new NConstStr(yylval.sval); }
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;
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