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netdata_netdata/tests/profile/test-eval.c

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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* 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 ../src/clocks.o ../src/web_buffer.o ../src/storage_number.o -pthread -lm
*/
#include "config.h"
#include "libnetdata/libnetdata.h"
#include "libnetdata/required_dummies.h"
#include "health/rrdcalc.h"
/*
void indent(int level, int show) {
int i = level;
while(i--) printf(" | ");
if(show) printf(" \\_ ");
else printf(" \\_ ");
}
void print_node(EVAL_NODE *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_node(v->expression, level+1);
break;
default:
printf("value (INVALID type %d)\n", v->type);
break;
}
}
void print_node(EVAL_NODE *op, int level) {
// if(op->operator != EVAL_OPERATOR_NOP) {
indent(level, 1);
if(op->operator) printf("%c (node %d, precedence: %d)\n", op->operator, op->id, op->precedence);
else printf("NOP (node %d, precedence: %d)\n", op->id, op->precedence);
// }
int i = op->count;
while(i--) print_value(&op->ops[i], level + 1);
}
NETDATA_DOUBLE evaluate(EVAL_NODE *op, int depth);
NETDATA_DOUBLE evaluate_value(EVAL_VALUE *v, int depth) {
switch(v->type) {
case EVAL_VALUE_NUMBER:
return v->number;
case EVAL_VALUE_EXPRESSION:
return evaluate(v->expression, depth);
default:
fatal("I don't know how to handle EVAL_VALUE type %d", v->type);
}
}
void print_depth(int depth) {
static int count = 0;
printf("%d. ", ++count);
while(depth--) printf(" ");
}
NETDATA_DOUBLE evaluate(EVAL_NODE *op, int depth) {
NETDATA_DOUBLE n1, n2, r;
switch(op->operator) {
case EVAL_OPERATOR_SIGN_PLUS:
r = evaluate_value(&op->ops[0], depth);
break;
case EVAL_OPERATOR_SIGN_MINUS:
r = -evaluate_value(&op->ops[0], depth);
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], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 + n2;
print_depth(depth);
printf("%Lf = %Lf + %Lf\n", r, n1, 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], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 - n2;
print_depth(depth);
printf("%Lf = %Lf - %Lf\n", r, n1, 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], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 * n2;
print_depth(depth);
printf("%Lf = %Lf * %Lf\n", r, n1, 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], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 / n2;
print_depth(depth);
printf("%Lf = %Lf / %Lf\n", r, n1, n2);
break;
case EVAL_OPERATOR_NOT:
n1 = evaluate_value(&op->ops[0], depth);
r = !n1;
print_depth(depth);
printf("%Lf = NOT %Lf\n", r, n1);
break;
case EVAL_OPERATOR_AND:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 && n2;
print_depth(depth);
printf("%Lf = %Lf AND %Lf\n", r, n1, n2);
break;
case EVAL_OPERATOR_OR:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 || n2;
print_depth(depth);
printf("%Lf = %Lf OR %Lf\n", r, n1, n2);
break;
case EVAL_OPERATOR_GREATER_THAN_OR_EQUAL:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 >= n2;
print_depth(depth);
printf("%Lf = %Lf >= %Lf\n", r, n1, n2);
break;
case EVAL_OPERATOR_LESS_THAN_OR_EQUAL:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 <= n2;
print_depth(depth);
printf("%Lf = %Lf <= %Lf\n", r, n1, n2);
break;
case EVAL_OPERATOR_GREATER:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 > n2;
print_depth(depth);
printf("%Lf = %Lf > %Lf\n", r, n1, n2);
break;
case EVAL_OPERATOR_LESS:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 < n2;
print_depth(depth);
printf("%Lf = %Lf < %Lf\n", r, n1, n2);
break;
case EVAL_OPERATOR_NOT_EQUAL:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 != n2;
print_depth(depth);
printf("%Lf = %Lf <> %Lf\n", r, n1, n2);
break;
case EVAL_OPERATOR_EQUAL:
if(op->count != 2)
fatal("Operator '%c' requires 2 values, but we have %d", op->operator, op->count);
n1 = evaluate_value(&op->ops[0], depth);
n2 = evaluate_value(&op->ops[1], depth);
r = n1 == n2;
print_depth(depth);
printf("%Lf = %Lf == %Lf\n", r, n1, n2);
break;
case EVAL_OPERATOR_EXPRESSION_OPEN:
printf("BEGIN SUB-EXPRESSION\n");
r = evaluate_value(&op->ops[0], depth + 1);
printf("END SUB-EXPRESSION\n");
break;
case EVAL_OPERATOR_NOP:
case EVAL_OPERATOR_VALUE:
r = evaluate_value(&op->ops[0], depth);
break;
default:
netdata_log_error("I don't know how to handle operator '%c'", op->operator);
r = 0;
break;
}
return r;
}
void print_expression(EVAL_NODE *op, const char *failed_at, int error) {
if(op) {
printf("expression tree:\n");
print_node(op, 0);
printf("\nevaluation steps:\n");
evaluate(op, 0);
int error;
NETDATA_DOUBLE ret = expression_evaluate(op, &error);
printf("\ninternal evaluator:\nSTATUS: %d, RESULT = %Lf\n", error, ret);
expression_free(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 expression (enclose it in single-quotes (') as a single parameter)\n");
exit(1);
}
const char *failed_at = NULL;
int error;
EVAL_EXPRESSION *exp = expression_parse(argv[1], &failed_at, &error);
if(!exp)
printf("\nPARSING FAILED\nExpression: '%s'\nParsing stopped at: '%s'\nParsing error code: %d (%s)\n", argv[1], (failed_at)?((*failed_at)?failed_at:"<END OF EXPRESSION>"):"<NONE>", error, expression_strerror(error));
else {
printf("\nPARSING OK\nExpression: '%s'\nParsed as : '%s'\nParsing error code: %d (%s)\n", argv[1], exp->parsed_as, error, expression_strerror(error));
if(expression_evaluate(exp)) {
printf("\nEvaluates to: %Lf\n\n", exp->result);
}
else {
printf("\nEvaluation failed with code %d and message: %s\n\n", exp->error, buffer_tostring(exp->error_msg));
}
expression_free(exp);
}
return 0;
}
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