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#include "error_helper.h"
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
void printError(char const *error, SourceCode code, char const *begin,
char const *end, ...) {
va_list args;
va_start(args, end);
char *errorStr;
vasprintf(&errorStr, error, args);
char const *lineBegin = code;
int line = 1;
char const *iter = code;
for (; iter < begin; ++iter) {
const char c = *iter;
switch (c) {
case '\0':
fprintf(stderr,
"Compiler Internal Error: in printing errors at compiler %s:%d",
__FILE_NAME__, __LINE__);
exit(1);
case '\n':
lineBegin = iter + 1;
++line;
break;
}
}
char const *lineEnd = end;
for (;; ++iter) {
const char c = *iter;
switch (c) {
case '\0':
if (iter < end) {
fprintf(
stderr,
"Compiler Internal Error: in printing errors at compiler %s:%d",
__FILE_NAME__, __LINE__);
exit(1);
}
lineEnd = iter;
goto AFTER_LOOP;
case '\n':
lineEnd = iter;
if (iter >= end) {
goto AFTER_LOOP;
}
break;
}
}
AFTER_LOOP:
fprintf(stderr, "Error: %s at line %d\n", errorStr, line);
int printed = 0;
for (iter = lineBegin; iter < lineEnd; ++iter) {
fprintf(stderr, "%c", *iter);
if (*iter == '\n') {
PRINT_LINE:
for (int i = 0; i < printed; ++i) {
const char *ch = iter - printed + i;
if (begin <= ch && ch < end) {
fprintf(stderr, "^");
} else {
fprintf(stderr, " ");
}
}
if (iter + 1 != lineEnd) {
fprintf(stderr, "\n");
printed = 0;
}
} else if (iter + 1 == lineEnd) {
fprintf(stderr, "\n");
goto PRINT_LINE;
} else {
++printed;
}
}
fprintf(stderr, "\n");
free(errorStr);
}
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