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lure.y
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lure.y
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/**
* Gramma fro Lu's Rule Engine (LURE)
* example:
* USER_TAGS IN ['admin', 'tester']
* CITY_ID IN (1, 2, 3)
* VERSION BETWEEN v1.2.3 AND v2.1.4
* VERSION >= v3.2.1
* DEVICE_OS == 'ios'
* RISK_SCORE > 0.85
* P_VALUE < 0.05
*/
%{
#define YYDEBUG 0
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
/*TODO: merge three into one header. */
#include "node.h"
#include "util.h"
#include "ast_builder.h"
extern int yylex(void);
void yyerror(NodeList **xpList, char *);
%}
%union {
char *name; /* identifier */
int intVal;
bool boolVal;
double doubleVal; /* value for token NUM*/
Node *expr;
NodeList *exprList;
};
%parse-param {NodeList **rootExprList}
%left TK_AND_LOGIC
%left TK_OR_LOGIC
%left TK_BETWEEN
%left TK_EQ TK_NE TK_GT TK_LT TK_GE TK_LE
%left TK_IN TK_NOT
%nonassoc BINOPX
%token <intVal> TK_EQ TK_NE TK_GT TK_LT TK_GE TK_LE
%token <intVal> TK_AND_KEYWORD TK_AND_LOGIC TK_OR_LOGIC TK_IN TK_NOT TK_NOTIN
%token <intVal> TK_INT_LITERAL
%token <doubleVal> TK_DOUBLE_LITERAL
%token <name> TK_STRING_LITERAL TK_IDENTITY_LITERAL
%type <expr> expr literal_value
%type <exprList> expr_list
%type <intVal> cmp_op
%%
expr_list
: expr { $$ = exprListOfExpr($1); *rootExprList = $$; }
| expr_list ',' expr { $$ = exprListAppend($1, $3); }
;
expr
: literal_value { $$ = $1; }
| expr cmp_op expr %prec BINOPX { $$ = exprBinOp($1, $2, $3); }
| expr TK_IN '(' expr_list ')' { $$ = exprIn($1, TK_IN, $4); }
| expr TK_NOT TK_IN '(' expr_list ')' { $$ = exprIn($1, TK_NOTIN, $5); }
| TK_IDENTITY_LITERAL '(' ')' { $$ = exprFunction0($1); free($1); }
| TK_IDENTITY_LITERAL '(' expr_list ')' { $$ = exprFunction($1, $3); free($1); }
| expr TK_BETWEEN expr TK_AND_KEYWORD expr %prec BINOPX { $$ = exprBetween($1, $3, $5); }
| expr TK_AND_LOGIC expr { $$ = exprBinOp($1, $2, $3); }
| expr TK_OR_LOGIC expr { $$ = exprBinOp($1, $2, $3); }
| TK_NOT expr { $$ = exprUnaryOp($1, $2); }
| '(' expr ')' { $$ = $2; }
;
cmp_op
: TK_EQ
| TK_NE
| TK_GT
| TK_LT
| TK_GE
| TK_LE
;
literal_value
: TK_INT_LITERAL { $$ = exprOfInt($1); }
| TK_DOUBLE_LITERAL { $$ = exprOfDouble($1); }
| TK_STRING_LITERAL { $$ = exprOfString($1); free($1); }
| TK_IDENTITY_LITERAL { $$ = exprOfIdentity($1); free($1); }
;
%%
void yyerror(NodeList **xpList, char *s) {
fprintf(stderr, "%s\n", s);
}