#include "internal.h"

// split will split the string by the given token.
// returns a stretchy buffer of strings that result from the partition.
// it is the caller's responsibility to clean the memory.
string*
str·split(string s, const byte* tok)
{
    string* fields = nil;
    vlong start  = 0;

    vlong sL   = str·len(s);
    vlong tokL = strlen(tok);
    if (sL == 0 || tokL == 0) return nil;

    buffit(fields, 5);

    for (vlong i = 0; i < sL - tokL; i++) {
        if ((tokL == 1 && s[i] == tokL) || !memcmp(s + i, tok, tokL)) {
            bufpush(fields, str·makelen(s + start, i - start));
            if (fields[buflen(fields) - 1] == nil) goto cleanup;

            start = i + tokL;
            i += tokL - 1;
        }
    }

    bufpush(fields, str·makelen(s + start, sL - start));

    return fields;

cleanup:
    for (vlong i = 0; i < buflen(fields); i++) {
        str·free(fields[i]);
    }
    buffree(fields);
    return nil;
}