Method: Oj::Doc#where

Defined in:
ext/oj/fast.c

#where ⇒ Object

Returns a String that describes the absolute path to the current location in the JSON document.


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# File 'ext/oj/fast.c', line 1188

static VALUE doc_where(VALUE self) {
    Doc doc = self_doc(self);

    if (0 == *doc->where_path || doc->where == doc->where_path) {
        return oj_slash_string;
    } else {
        Leaf  *lp;
        Leaf   leaf;
        size_t size = 3;  // leading / and terminating \0
        char  *path;
        char  *p;

        for (lp = doc->where_path; lp <= doc->where; lp++) {
            leaf = *lp;
            if (T_HASH == leaf->parent_type) {
                size += esc_strlen((*lp)->key) + 1;
            } else if (T_ARRAY == leaf->parent_type) {
                size += ((*lp)->index < 100) ? 3 : 11;
            }
        }
        path = ALLOCA_N(char, size);
        p    = path;
        for (lp = doc->where_path; lp <= doc->where; lp++) {
            leaf = *lp;
            if (T_HASH == leaf->parent_type) {
                p = append_key(p, (*lp)->key);
            } else if (T_ARRAY == leaf->parent_type) {
                p = ulong_fill(p, (*lp)->index);
            }
            *p++ = '/';
        }
        *--p = '\0';

        return rb_str_new(path, p - path);
    }
}