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/*
* 1. build netdata (as normally)
* 2. cd profile/
* 3. compile with:
* gcc -O1 -ggdb -Wall -Wextra -I ../src/ -I ../ -o test-eval test-eval.c ../src/log.o ../src/eval.o ../src/common.o -pthread
*
*/
#include "common.h"
void netdata_cleanup_and_exit(int ret) { exit(ret); }
void indent(int level, int show) {
int i = level;
while(i--) printf(" | ");
if(show) printf(" \\_ ");
else printf(" \\_ ");
}
void print_operand(EVAL_OPERAND *op, int level);
void print_value(EVAL_VALUE *v, int level) {
indent(level, 0);
switch(v->type) {
case EVAL_VALUE_INVALID:
printf("VALUE (NOP)\n");
break;
case EVAL_VALUE_NUMBER:
printf("VALUE %Lf (NUMBER)\n", v->number);
break;
case EVAL_VALUE_EXPRESSION:
printf("VALUE (SUB-EXPRESSION)\n");
print_operand(v->expression, level+1);
break;
default:
printf("VALUE (INVALID type %d)\n", v->type);
break;
}
}
void print_operand(EVAL_OPERAND *op, int level) {
// if(op->operator != EVAL_OPERATOR_NOP) {
indent(level, 1);
if(op->operator) printf("%c (OPERATOR %d, prec: %d)\n", op->operator, op->id, op->precedence);
else printf("NOP (OPERATOR %d, prec: %d)\n", op->id, op->precedence);
// }
int i = op->count;
while(i--) print_value(&op->ops[i], level + 1);
}
calculated_number evaluate(EVAL_OPERAND *op);
calculated_number evaluate_value(EVAL_VALUE *v) {
switch(v->type) {
case EVAL_VALUE_NUMBER:
return v->number;
case EVAL_VALUE_EXPRESSION:
return evaluate(v->expression);
default:
fatal("I don't know how to handle EVAL_VALUE type %d", v->type);
}
}
calculated_number evaluate(EVAL_OPERAND *op) {
calculated_number n1, n2, r;
switch(op->operator) {
case EVAL_OPERATOR_SIGN_PLUS:
r = evaluate_value(&op->ops[0]);
break;
case EVAL_OPERATOR_SIGN_MINUS:
r = -evaluate_value(&op->ops[0]);
break;
case EVAL_OPERATOR_PLUS:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0]);
n2 = evaluate_value(&op->ops[1]);
r = n1 + n2;
printf("%Lf = %Lf %c %Lf\n", r, n1, op->operator, n2);
break;
case EVAL_OPERATOR_MINUS:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0]);
n2 = evaluate_value(&op->ops[1]);
r = n1 - n2;
printf("%Lf = %Lf %c %Lf\n", r, n1, op->operator, n2);
break;
case EVAL_OPERATOR_MULTIPLY:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0]);
n2 = evaluate_value(&op->ops[1]);
r = n1 * n2;
printf("%Lf = %Lf %c %Lf\n", r, n1, op->operator, n2);
break;
case EVAL_OPERATOR_DIVIDE:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0]);
n2 = evaluate_value(&op->ops[1]);
r = n1 / n2;
printf("%Lf = %Lf %c %Lf\n", r, n1, op->operator, n2);
break;
case EVAL_OPERATOR_EXPRESSION_OPEN:
printf("BEGIN SUB-EXPRESSION\n");
r = evaluate_value(&op->ops[0]);
printf("END SUB-EXPRESSION\n");
break;
case EVAL_OPERATOR_NOP:
case EVAL_OPERATOR_VALUE:
r = evaluate_value(&op->ops[0]);
break;
default:
fatal("I don't know how to handle operator '%c'", op->operator);
break;
}
return r;
}
void print_expression(EVAL_OPERAND *op, const char *failed_at, int error) {
if(op) {
printf("<expression root>\n");
print_operand(op, 0);
evaluate(op);
free_expression(op);
}
else {
printf("error: %d, failed_at: '%s'\n", error, (failed_at)?failed_at:"<NONE>");
}
}
int main(int argc, char **argv) {
if(argc != 2) {
fprintf(stderr, "I need an epxression\n");
exit(1);
}
const char *failed_at = NULL;
int error;
EVAL_OPERAND *op = parse_expression(argv[1], &failed_at, &error);
print_expression(op, failed_at, error);
return 0;
}
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