YT-19324: move YT provider to ydb/library/yql

This commit is formed by the following script: https://paste.yandex-team.ru/6f92e4b8-efc5-4d34-948b-15ee2accd7e7/text.
This commit has zero effect on all projects that depend on YQL.

The summary of changes:
- `yql/providers/yt -> ydb/library/yql/providers/yt `- the whole implementation of YT provider is moved into YDB code base for further export as a part of YT YQL plugin shared library;
- `yql/providers/stat/{expr_nodes,uploader} -> ydb/library/yql/providers/stat/{expr_nodes,uploader}` - a small interface without implementation and the description of stat expr nodes;
- `yql/core/extract_predicate/ut -> ydb/library/yql/core/extract_predicate/ut`;
- `yql/core/{ut,ut_common} -> ydb/library/yql/core/{ut,ut_common}`;
- `yql/core` is gone;
- `yql/library/url_preprocessing -> ydb/library/yql/core/url_preprocessing`.

**NB**: all new targets inside `ydb/` are under `IF (NOT CMAKE_EXPORT)` clause which disables them from open-source cmake generation and ya make build. They will be enabled in the subsequent commits.

1 files changed, 69 insertions, 0 deletions

diff --git a/contrib/libs/yajl/yajl_bytestack.h b/contrib/libs/yajl/yajl_bytestack.h
new file mode 100644
index 0000000000..9ea7d151e3
--- /dev/null
+++ b/contrib/libs/yajl/yajl_bytestack.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * A header only implementation of a simple stack of bytes, used in YAJL
+ * to maintain parse state.
+ */
+
+#ifndef __YAJL_BYTESTACK_H__
+#define __YAJL_BYTESTACK_H__
+
+#include "api/yajl_common.h"
+
+#define YAJL_BS_INC 128
+
+typedef struct yajl_bytestack_t
+{
+    unsigned char * stack;
+    size_t size;
+    size_t used;
+    yajl_alloc_funcs * yaf;
+} yajl_bytestack;
+
+/* initialize a bytestack */
+#define yajl_bs_init(obs, _yaf) {               \
+        (obs).stack = NULL;                     \
+        (obs).size = 0;                         \
+        (obs).used = 0;                         \
+        (obs).yaf = (_yaf);                     \
+    }                                           \
+
+
+/* initialize a bytestack */
+#define yajl_bs_free(obs)                 \
+    if ((obs).stack) (obs).yaf->free((obs).yaf->ctx, (obs).stack);
+
+#define yajl_bs_current(obs)               \
+    (assert((obs).used > 0), (obs).stack[(obs).used - 1])
+
+#define yajl_bs_push(obs, byte) {                       \
+    if (((obs).size - (obs).used) == 0) {               \
+        (obs).size += YAJL_BS_INC;                      \
+        (obs).stack = (obs).yaf->realloc((obs).yaf->ctx,\
+                                         (void *) (obs).stack, (obs).size);\
+    }                                                   \
+    (obs).stack[((obs).used)++] = (byte);               \
+}
+
+/* removes the top item of the stack, returns nothing */
+#define yajl_bs_pop(obs) { ((obs).used)--; }
+
+#define yajl_bs_set(obs, byte)                          \
+    (obs).stack[((obs).used) - 1] = (byte);
+
+
+#endif