146 lines
2.2 KiB
Plaintext
146 lines
2.2 KiB
Plaintext
%{
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#include <stdio.h>
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#include <string.h>
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#include "expression.h"
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#include "lexer.h"
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#include "filter.h"
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void yyerror(const char *str)
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{
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fprintf(stderr,"error: %s\n",str);
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fprintf(stderr, "%s\n", "YOLO");
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}
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int yywrap()
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{
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return 1;
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}
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extern node_t *zfilter;
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%}
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%union {
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int int_literal;
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char *string_literal;
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struct node *expr;
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}
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%token '(' ')' T_AND T_OR
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%token <int_literal> T_NUMBER
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%token <string_literal> T_FIELD
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%token T_NOT_EQ T_GT_EQ '>' '<' '=' T_LT_EQ
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%left T_OR
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%left T_AND
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%type <expr> filter
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%type <expr> number_filter
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%type <expr> string_filter
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%type <expr> filter_expr
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%%
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expression: filter_expr
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{
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zfilter = $1;
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}
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filter_expr:
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filter_expr T_OR filter_expr
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{
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$$ = make_op_node(OR);
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$$->left_child = $1;
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$$->right_child = $3;
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}
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| filter_expr T_AND filter_expr
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{
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$$ = make_op_node(AND);
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$$->left_child = $1;
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$$->right_child = $3;
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}
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| '(' filter_expr ')'
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{
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$$ = $2;
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}
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| filter
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{
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$$ = $1;
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}
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;
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filter: number_filter
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{
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$$ = $1;
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}
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| string_filter
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{
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$$ = $1;
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}
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;
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number_filter: T_FIELD '=' T_NUMBER
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{
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$$ = make_op_node(EQ);
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$$->left_child = make_field_node($1);
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$$->right_child = make_int_node($3);
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}
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T_FIELD '>' T_NUMBER
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{
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$$ = make_op_node(GT);
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$$->left_child = make_field_node($1);
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$$->right_child = make_int_node($3);
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}
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T_FIELD '<' T_NUMBER
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{
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$$ = make_op_node(LT);
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$$->left_child = make_field_node($1);
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$$->right_child = make_int_node($3);
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}
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T_FIELD T_NOT_EQ T_NUMBER
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{
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$$ = make_op_node(NEQ);
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$$->left_child = make_field_node($1);
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$$->right_child = make_int_node($3);
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}
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T_FIELD T_GT_EQ T_NUMBER
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{
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$$ = make_op_node(GT_EQ);
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$$->left_child = make_field_node($1);
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$$->right_child = make_int_node($3);
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}
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T_FIELD T_LT_EQ T_NUMBER
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{
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$$ = make_op_node(LT_EQ);
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$$->left_child = make_field_node($1);
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$$->right_child = make_int_node($3);
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}
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;
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string_filter:
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T_FIELD '=' T_FIELD
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{
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$$ = make_op_node(EQ);
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$$->left_child = make_field_node($1);
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$$->right_child = make_string_node($3);
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}
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T_FIELD T_NOT_EQ T_FIELD
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{
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$$ = make_op_node(NEQ);
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$$->left_child = make_field_node($1);
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$$->right_child = make_string_node($3);
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}
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;
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%%
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