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, 231 insertions, 0 deletions

diff --git a/contrib/libs/yajl/api/yajl_parse.h b/contrib/libs/yajl/api/yajl_parse.h
new file mode 100644
index 0000000000..36a89a52a4
--- /dev/null
+++ b/contrib/libs/yajl/api/yajl_parse.h
@@ -0,0 +1,231 @@
+/*
+ * 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.
+ */
+
+/**
+ * \file yajl_parse.h
+ * Interface to YAJL's JSON stream parsing facilities.
+ */
+
+#include "yajl_common.h"
+
+#ifndef __YAJL_PARSE_H__
+#define __YAJL_PARSE_H__
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    /** error codes returned from this interface */
+    typedef enum {
+        /** no error was encountered */
+        yajl_status_ok,
+        /** a client callback returned zero, stopping the parse */
+        yajl_status_client_canceled,
+        /** An error occured during the parse.  Call yajl_get_error for
+         *  more information about the encountered error */
+        yajl_status_error
+    } yajl_status;
+
+    /** attain a human readable, english, string for an error */
+    YAJL_API const char * yajl_status_to_string(yajl_status code);
+
+    /** an opaque handle to a parser */
+    typedef struct yajl_handle_t * yajl_handle;
+
+    /** yajl is an event driven parser.  this means as json elements are
+     *  parsed, you are called back to do something with the data.  The
+     *  functions in this table indicate the various events for which
+     *  you will be called back.  Each callback accepts a "context"
+     *  pointer, this is a void * that is passed into the yajl_parse
+     *  function which the client code may use to pass around context.
+     *
+     *  All callbacks return an integer.  If non-zero, the parse will
+     *  continue.  If zero, the parse will be canceled and
+     *  yajl_status_client_canceled will be returned from the parse.
+     *
+     *  \attention {
+     *    A note about the handling of numbers:
+     *
+     *    yajl will only convert numbers that can be represented in a
+     *    double or a 64 bit (long long) int.  All other numbers will
+     *    be passed to the client in string form using the yajl_number
+     *    callback.  Furthermore, if yajl_number is not NULL, it will
+     *    always be used to return numbers, that is yajl_integer,
+     *    yajl_unsigned_integer and yajl_double will be ignored.
+     *    If yajl_number is NULL but one of yajl_integer or
+     *    yajl_double are defined, parsing of a number larger than
+     *    is representable in a double or 64 bit integer will result
+     *    in a parse error.
+     *  }
+     */
+    typedef struct {
+        int (* yajl_null)(void * ctx);
+        int (* yajl_boolean)(void * ctx, int boolVal);
+        int (* yajl_integer)(void * ctx, long long integerVal);
+        int (* yajl_unsigned_integer)(void * ctx, unsigned long long integerVal);
+        int (* yajl_double)(void * ctx, double doubleVal);
+        /** A callback which passes the string representation of the number
+         *  back to the client.  Will be used for all numbers when present */
+        int (* yajl_number)(void * ctx, const char * numberVal,
+                            size_t numberLen);
+
+        /** strings are returned as pointers into the JSON text when,
+         * possible, as a result, they are _not_ null padded */
+        int (* yajl_string)(void * ctx, const unsigned char * stringVal,
+                            size_t stringLen);
+
+        int (* yajl_start_map)(void * ctx);
+        int (* yajl_map_key)(void * ctx, const unsigned char * key,
+                             size_t stringLen);
+        int (* yajl_end_map)(void * ctx);
+
+        int (* yajl_start_array)(void * ctx);
+        int (* yajl_end_array)(void * ctx);
+    } yajl_callbacks;
+
+    /** allocate a parser handle
+     *  \param callbacks  a yajl callbacks structure specifying the
+     *                    functions to call when different JSON entities
+     *                    are encountered in the input text.  May be NULL,
+     *                    which is only useful for validation.
+     *  \param afs        memory allocation functions, may be NULL for to use
+     *                    C runtime library routines (malloc and friends)
+     *  \param ctx        a context pointer that will be passed to callbacks.
+     */
+    YAJL_API yajl_handle yajl_alloc(const yajl_callbacks * callbacks,
+                                    yajl_alloc_funcs * afs,
+                                    void * ctx);
+
+
+    /** configuration parameters for the parser, these may be passed to
+     *  yajl_config() along with option specific argument(s).  In general,
+     *  all configuration parameters default to *off*. */
+    typedef enum {
+        /** Ignore javascript style comments present in
+         *  JSON input.  Non-standard, but rather fun
+         *  arguments: toggled off with integer zero, on otherwise.
+         *
+         *  example:
+         *    yajl_config(h, yajl_allow_comments, 1); // turn comment support on
+         */
+        yajl_allow_comments = 0x01,
+        /**
+         * When set the parser will verify that all strings in JSON input are
+         * valid UTF8 and will emit a parse error if this is not so.  When set,
+         * this option makes parsing slightly more expensive (~7% depending
+         * on processor and compiler in use)
+         *
+         * example:
+         *   yajl_config(h, yajl_dont_validate_strings, 1); // disable utf8 checking
+         */
+        yajl_dont_validate_strings     = 0x02,
+        /**
+         * By default, upon calls to yajl_complete_parse(), yajl will
+         * ensure the entire input text was consumed and will raise an error
+         * otherwise.  Enabling this flag will cause yajl to disable this
+         * check.  This can be useful when parsing json out of a that contains more
+         * than a single JSON document.
+         */
+        yajl_allow_trailing_garbage = 0x04,
+        /**
+         * Allow multiple values to be parsed by a single handle.  The
+         * entire text must be valid JSON, and values can be seperated
+         * by any kind of whitespace.  This flag will change the
+         * behavior of the parser, and cause it continue parsing after
+         * a value is parsed, rather than transitioning into a
+         * complete state.  This option can be useful when parsing multiple
+         * values from an input stream.
+         */
+        yajl_allow_multiple_values = 0x08,
+        /**
+         * When yajl_complete_parse() is called the parser will
+         * check that the top level value was completely consumed.  I.E.,
+         * if called whilst in the middle of parsing a value
+         * yajl will enter an error state (premature EOF).  Setting this
+         * flag suppresses that check and the corresponding error.
+         */
+        yajl_allow_partial_values = 0x10
+    } yajl_option;
+
+    /** allow the modification of parser options subsequent to handle
+     *  allocation (via yajl_alloc)
+     *  \returns zero in case of errors, non-zero otherwise
+     */
+    YAJL_API int yajl_config(yajl_handle h, yajl_option opt, ...);
+
+    /** set limit for total size of internal buffers */
+    YAJL_API void yajl_set_memory_limit(yajl_handle h, unsigned long limit);
+
+    /** free a parser handle */
+    YAJL_API void yajl_free(yajl_handle handle);
+
+    /** Parse some json!
+     *  \param hand - a handle to the json parser allocated with yajl_alloc
+     *  \param jsonText - a pointer to the UTF8 json text to be parsed
+     *  \param jsonTextLength - the length, in bytes, of input text
+     */
+    YAJL_API yajl_status yajl_parse(yajl_handle hand,
+                                    const unsigned char * jsonText,
+                                    size_t jsonTextLength);
+
+    /** Parse any remaining buffered json.
+     *  Since yajl is a stream-based parser, without an explicit end of
+     *  input, yajl sometimes can't decide if content at the end of the
+     *  stream is valid or not.  For example, if "1" has been fed in,
+     *  yajl can't know whether another digit is next or some character
+     *  that would terminate the integer token.
+     *
+     *  \param hand - a handle to the json parser allocated with yajl_alloc
+     */
+    YAJL_API yajl_status yajl_complete_parse(yajl_handle hand);
+
+    /** get an error string describing the state of the
+     *  parse.
+     *
+     *  If verbose is non-zero, the message will include the JSON
+     *  text where the error occured, along with an arrow pointing to
+     *  the specific char.
+     *
+     *  \returns A dynamically allocated string will be returned which should
+     *  be freed with yajl_free_error
+     */
+    YAJL_API unsigned char * yajl_get_error(yajl_handle hand, int verbose,
+                                            const unsigned char * jsonText,
+                                            size_t jsonTextLength);
+
+    /**
+     * get the amount of data consumed from the last chunk passed to YAJL.
+     *
+     * In the case of a successful parse this can help you understand if
+     * the entire buffer was consumed (which will allow you to handle
+     * "junk at end of input").
+     *
+     * In the event an error is encountered during parsing, this function
+     * affords the client a way to get the offset into the most recent
+     * chunk where the error occured.  0 will be returned if no error
+     * was encountered.
+     */
+    YAJL_API size_t yajl_get_bytes_consumed(yajl_handle hand);
+
+    /** free an error returned from yajl_get_error */
+    YAJL_API void yajl_free_error(yajl_handle hand, unsigned char * str);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif