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#include <assert.h>
#include <stdarg.h>
#include <string.h>

#include "loc.h"

static size_t
min(size_t a, size_t b)
{
    return a < b ? a : b;
}

static size_t
max(size_t a, size_t b)
{
    return a > b ? a : b;
}

struct Loc nullLoc;

struct Loc
combineLoc(struct Loc loc0, struct Loc loc1)
{
    assert(strcmp(loc0.filename, loc1.filename));

    struct Loc loc = { {
                         min(loc0.begin.line, loc1.begin.line),
                         min(loc0.begin.col, loc1.begin.col),
                       },
                       {
                         max(loc0.begin.line, loc1.begin.line),
                         max(loc0.begin.col, loc1.begin.col),
                       },
                        loc0.filename};
    return loc;
}

void
fprintfLoc(FILE *out, const struct Loc *loc, const char *fmt, ...)
{
    va_list argp;
    va_start(argp, fmt);
    vfprintfLoc(out, loc, fmt, argp);
    va_end(argp);

    /*
    fprintf(stderr, "%s:%zu.%zu-%zu.%zu: ", loc->filename, loc->begin.line,
            loc->begin.col, loc->end.line, loc->end.col);

    va_list argp;
    va_start(argp, fmt);
    vfprintf(out, fmt, argp);
    va_end(argp);
    */
}

void
vfprintfLoc(FILE *out, const struct Loc *loc, const char *fmt, va_list ap)
{
    if (loc) {
        const char *f = loc->filename ? loc->filename : "<undefined filename>";
        fprintf(stderr, "%s:%zu.%zu-%zu.%zu: ", f, loc->begin.line,
                loc->begin.col, loc->end.line, loc->end.col);
    }
    vfprintf(out, fmt, ap);
}