MVM_string_gi_get_grapheme_at.c

/* Returns the codepoint from grapheme iterator at a specific location without doing checks, for internal VM use only. */
MVMGrapheme32 MVM_string_gi_get_grapheme_at(MVMThreadContext *tc, MVMString *a, MVMGraphemeIter *gi, MVMint64 index) {
    switch (a->body.storage_type) {
    case MVM_STRING_GRAPHEME_32:
        return a->body.storage.blob_32[index];
    case MVM_STRING_GRAPHEME_ASCII:
        return a->body.storage.blob_ascii[index];
    case MVM_STRING_GRAPHEME_8:
        return a->body.storage.blob_8[index];
    case MVM_STRING_STRAND: {
        MVM_string_gi_move_to(tc, gi, index);
        return MVM_string_gi_get_grapheme(tc, gi);
    }
    default:
        MVM_exception_throw_adhoc(tc, "String corruption detected: bad storage type");
    }
}