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#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include "source.h"
void source_init(struct source *src, str name, str contents)
{
src->name = name;
src->offset = 0;
src->contents = contents;
src->strings.len = src->strings.cap = 0;
src->strings.ptr = nullptr;
}
void source_error(struct source *src, struct range loc, const char *fmt, ...)
{
char *p_start = src->contents.ptr + loc.start;
char *p_end = src->contents.ptr + loc.end;
unsigned int lineno = 0;
str iter = src->contents;
str line;
do {
line = str_walk(&iter, S("\n"));
lineno++;
} while (line.ptr + line.len <= p_start);
fprintf(stderr, "parse error in %.*s:%u: ", PSTR(src->name), lineno);
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fprintf(stderr, "\n");
while (line.ptr && line.ptr < p_end) {
fprintf(stderr, " %4u: %.*s\n", lineno, PSTR(line));
fprintf(stderr, " ");
for (size_t i = 0; i < line.len+1; i++) {
char *p = line.ptr + i;
fprintf(stderr, "%c", p >= p_start && p < p_end ? '^' : ' ');
}
fprintf(stderr, "\n");
line = str_walk(&iter, S("\n"));
lineno++;
}
exit(EXIT_FAILURE);
}
void source_free(struct source *src)
{
free(src->contents.ptr);
for (size_t i = 0; i < src->strings.len; i++)
free(src->strings.ptr[i].ptr);
free(src->strings.ptr);
}
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