/*****************************************************************************

Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.

This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation.  The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License, version 2.0, for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA

*****************************************************************************/

/**************************************************//**
@file include/pars0pars.h
SQL parser

Created 11/19/1996 Heikki Tuuri
*******************************************************/

#ifndef pars0pars_h
#define pars0pars_h

#include "univ.i"
#include "que0types.h"
#include "usr0types.h"
#include "pars0types.h"
#include "row0types.h"
#include "trx0types.h"
#include "ut0vec.h"

/** Type of the user functions. The first argument is always InnoDB-supplied
and varies in type, while 'user_arg' is a user-supplied argument. The
meaning of the return type also varies. See the individual use cases, e.g.
the FETCH statement, for details on them. */
typedef ibool	(*pars_user_func_cb_t)(void* arg, void* user_arg);

/** If the following is set TRUE, the parser will emit debugging
information */
extern int	yydebug;

#ifdef UNIV_SQL_DEBUG
/** If the following is set TRUE, the lexer will print the SQL string
as it tokenizes it */
extern ibool	pars_print_lexed;
#endif /* UNIV_SQL_DEBUG */

/* Global variable used while parsing a single procedure or query : the code is
NOT re-entrant */
extern sym_tab_t*	pars_sym_tab_global;

extern pars_res_word_t	pars_to_char_token;
extern pars_res_word_t	pars_to_number_token;
extern pars_res_word_t	pars_to_binary_token;
extern pars_res_word_t	pars_binary_to_number_token;
extern pars_res_word_t	pars_substr_token;
extern pars_res_word_t	pars_replstr_token;
extern pars_res_word_t	pars_concat_token;
extern pars_res_word_t	pars_length_token;
extern pars_res_word_t	pars_instr_token;
extern pars_res_word_t	pars_sysdate_token;
extern pars_res_word_t	pars_printf_token;
extern pars_res_word_t	pars_assert_token;
extern pars_res_word_t	pars_rnd_token;
extern pars_res_word_t	pars_rnd_str_token;
extern pars_res_word_t	pars_count_token;
extern pars_res_word_t	pars_sum_token;
extern pars_res_word_t	pars_distinct_token;
extern pars_res_word_t	pars_binary_token;
extern pars_res_word_t	pars_blob_token;
extern pars_res_word_t	pars_int_token;
extern pars_res_word_t	pars_bigint_token;
extern pars_res_word_t	pars_char_token;
extern pars_res_word_t	pars_float_token;
extern pars_res_word_t	pars_update_token;
extern pars_res_word_t	pars_asc_token;
extern pars_res_word_t	pars_desc_token;
extern pars_res_word_t	pars_open_token;
extern pars_res_word_t	pars_close_token;
extern pars_res_word_t	pars_share_token;
extern pars_res_word_t	pars_unique_token;
extern pars_res_word_t	pars_clustered_token;

extern ulint		pars_star_denoter;

/* Procedure parameter types */
#define PARS_INPUT	0
#define PARS_OUTPUT	1
#define PARS_NOT_PARAM	2

int
yyparse(void);

/*************************************************************//**
Parses an SQL string returning the query graph.
@return	own: the query graph */
UNIV_INTERN
que_t*
pars_sql(
/*=====*/
	pars_info_t*	info,	/*!< in: extra information, or NULL */
	const char*	str);	/*!< in: SQL string */
/*************************************************************//**
Retrieves characters to the lexical analyzer.
@return number of characters copied or 0 on EOF */
UNIV_INTERN
int
pars_get_lex_chars(
/*===============*/
	char*	buf,		/*!< in/out: buffer where to copy */
	int	max_size);	/*!< in: maximum number of characters which fit
				in the buffer */
/*************************************************************//**
Called by yyparse on error. */
UNIV_INTERN
void
yyerror(
/*====*/
	const char*	s);	/*!< in: error message string */
/*********************************************************************//**
Parses a variable declaration.
@return	own: symbol table node of type SYM_VAR */
UNIV_INTERN
sym_node_t*
pars_variable_declaration(
/*======================*/
	sym_node_t*	node,	/*!< in: symbol table node allocated for the
				id of the variable */
	pars_res_word_t* type);	/*!< in: pointer to a type token */
/*********************************************************************//**
Parses a function expression.
@return	own: function node in a query tree */
UNIV_INTERN
func_node_t*
pars_func(
/*======*/
	que_node_t*	res_word,/*!< in: function name reserved word */
	que_node_t*	arg);	/*!< in: first argument in the argument list */
/*************************************************************************
Rebind a LIKE search string. NOTE: We ignore any '%' characters embedded
within the search string.
@return	own: function node in a query tree */
UNIV_INTERN
int
pars_like_rebind(
/*=============*/
        sym_node_t*     node,   /* in: The search string node.*/
        const byte*     ptr,    /* in: literal to (re) bind */
        ulint           len);   /* in: length of literal to (re) bind*/
/*********************************************************************//**
Parses an operator expression.
@return	own: function node in a query tree */
UNIV_INTERN
func_node_t*
pars_op(
/*====*/
	int		func,	/*!< in: operator token code */
	que_node_t*	arg1,	/*!< in: first argument */
	que_node_t*	arg2);	/*!< in: second argument or NULL for an unary
				operator */
/*********************************************************************//**
Parses an ORDER BY clause. Order by a single column only is supported.
@return	own: order-by node in a query tree */
UNIV_INTERN
order_node_t*
pars_order_by(
/*==========*/
	sym_node_t*	column,	/*!< in: column name */
	pars_res_word_t* asc);	/*!< in: &pars_asc_token or pars_desc_token */
/*********************************************************************//**
Parses a select list; creates a query graph node for the whole SELECT
statement.
@return	own: select node in a query tree */
UNIV_INTERN
sel_node_t*
pars_select_list(
/*=============*/
	que_node_t*	select_list,	/*!< in: select list */
	sym_node_t*	into_list);	/*!< in: variables list or NULL */
/*********************************************************************//**
Parses a cursor declaration.
@return	sym_node */
UNIV_INTERN
que_node_t*
pars_cursor_declaration(
/*====================*/
	sym_node_t*	sym_node,	/*!< in: cursor id node in the symbol
					table */
	sel_node_t*	select_node);	/*!< in: select node */
/*********************************************************************//**
Parses a function declaration.
@return	sym_node */
UNIV_INTERN
que_node_t*
pars_function_declaration(
/*======================*/
	sym_node_t*	sym_node);	/*!< in: function id node in the symbol
					table */
/*********************************************************************//**
Parses a select statement.
@return	own: select node in a query tree */
UNIV_INTERN
sel_node_t*
pars_select_statement(
/*==================*/
	sel_node_t*	select_node,	/*!< in: select node already containing
					the select list */
	sym_node_t*	table_list,	/*!< in: table list */
	que_node_t*	search_cond,	/*!< in: search condition or NULL */
	pars_res_word_t* for_update,	/*!< in: NULL or &pars_update_token */
	pars_res_word_t* consistent_read,/*!< in: NULL or
						&pars_consistent_token */
	order_node_t*	order_by);	/*!< in: NULL or an order-by node */
/*********************************************************************//**
Parses a column assignment in an update.
@return	column assignment node */
UNIV_INTERN
col_assign_node_t*
pars_column_assignment(
/*===================*/
	sym_node_t*	column,	/*!< in: column to assign */
	que_node_t*	exp);	/*!< in: value to assign */
/*********************************************************************//**
Parses a delete or update statement start.
@return	own: update node in a query tree */
UNIV_INTERN
upd_node_t*
pars_update_statement_start(
/*========================*/
	ibool		is_delete,	/*!< in: TRUE if delete */
	sym_node_t*	table_sym,	/*!< in: table name node */
	col_assign_node_t* col_assign_list);/*!< in: column assignment list, NULL
					if delete */
/*********************************************************************//**
Parses an update or delete statement.
@return	own: update node in a query tree */
UNIV_INTERN
upd_node_t*
pars_update_statement(
/*==================*/
	upd_node_t*	node,		/*!< in: update node */
	sym_node_t*	cursor_sym,	/*!< in: pointer to a cursor entry in
					the symbol table or NULL */
	que_node_t*	search_cond);	/*!< in: search condition or NULL */
/*********************************************************************//**
Parses an insert statement.
@return	own: update node in a query tree */
UNIV_INTERN
ins_node_t*
pars_insert_statement(
/*==================*/
	sym_node_t*	table_sym,	/*!< in: table name node */
	que_node_t*	values_list,	/*!< in: value expression list or NULL */
	sel_node_t*	select);	/*!< in: select condition or NULL */
/*********************************************************************//**
Parses a procedure parameter declaration.
@return	own: symbol table node of type SYM_VAR */
UNIV_INTERN
sym_node_t*
pars_parameter_declaration(
/*=======================*/
	sym_node_t*	node,	/*!< in: symbol table node allocated for the
				id of the parameter */
	ulint		param_type,
				/*!< in: PARS_INPUT or PARS_OUTPUT */
	pars_res_word_t* type);	/*!< in: pointer to a type token */
/*********************************************************************//**
Parses an elsif element.
@return	elsif node */
UNIV_INTERN
elsif_node_t*
pars_elsif_element(
/*===============*/
	que_node_t*	cond,		/*!< in: if-condition */
	que_node_t*	stat_list);	/*!< in: statement list */
/*********************************************************************//**
Parses an if-statement.
@return	if-statement node */
UNIV_INTERN
if_node_t*
pars_if_statement(
/*==============*/
	que_node_t*	cond,		/*!< in: if-condition */
	que_node_t*	stat_list,	/*!< in: statement list */
	que_node_t*	else_part);	/*!< in: else-part statement list */
/*********************************************************************//**
Parses a for-loop-statement.
@return	for-statement node */
UNIV_INTERN
for_node_t*
pars_for_statement(
/*===============*/
	sym_node_t*	loop_var,	/*!< in: loop variable */
	que_node_t*	loop_start_limit,/*!< in: loop start expression */
	que_node_t*	loop_end_limit,	/*!< in: loop end expression */
	que_node_t*	stat_list);	/*!< in: statement list */
/*********************************************************************//**
Parses a while-statement.
@return	while-statement node */
UNIV_INTERN
while_node_t*
pars_while_statement(
/*=================*/
	que_node_t*	cond,		/*!< in: while-condition */
	que_node_t*	stat_list);	/*!< in: statement list */
/*********************************************************************//**
Parses an exit statement.
@return	exit statement node */
UNIV_INTERN
exit_node_t*
pars_exit_statement(void);
/*=====================*/
/*********************************************************************//**
Parses a return-statement.
@return	return-statement node */
UNIV_INTERN
return_node_t*
pars_return_statement(void);
/*=======================*/
/*********************************************************************//**
Parses a procedure call.
@return	function node */
UNIV_INTERN
func_node_t*
pars_procedure_call(
/*================*/
	que_node_t*	res_word,/*!< in: procedure name reserved word */
	que_node_t*	args);	/*!< in: argument list */
/*********************************************************************//**
Parses an assignment statement.
@return	assignment statement node */
UNIV_INTERN
assign_node_t*
pars_assignment_statement(
/*======================*/
	sym_node_t*	var,	/*!< in: variable to assign */
	que_node_t*	val);	/*!< in: value to assign */
/*********************************************************************//**
Parses a fetch statement. into_list or user_func (but not both) must be
non-NULL.
@return	fetch statement node */
UNIV_INTERN
fetch_node_t*
pars_fetch_statement(
/*=================*/
	sym_node_t*	cursor,		/*!< in: cursor node */
	sym_node_t*	into_list,	/*!< in: variables to set, or NULL */
	sym_node_t*	user_func);	/*!< in: user function name, or NULL */
/*********************************************************************//**
Parses an open or close cursor statement.
@return	fetch statement node */
UNIV_INTERN
open_node_t*
pars_open_statement(
/*================*/
	ulint		type,	/*!< in: ROW_SEL_OPEN_CURSOR
				or ROW_SEL_CLOSE_CURSOR */
	sym_node_t*	cursor);	/*!< in: cursor node */
/*********************************************************************//**
Parses a row_printf-statement.
@return	row_printf-statement node */
UNIV_INTERN
row_printf_node_t*
pars_row_printf_statement(
/*======================*/
	sel_node_t*	sel_node);	/*!< in: select node */
/*********************************************************************//**
Parses a commit statement.
@return	own: commit node struct */
UNIV_INTERN
commit_node_t*
pars_commit_statement(void);
/*=======================*/
/*********************************************************************//**
Parses a rollback statement.
@return	own: rollback node struct */
UNIV_INTERN
roll_node_t*
pars_rollback_statement(void);
/*=========================*/
/*********************************************************************//**
Parses a column definition at a table creation.
@return	column sym table node */
UNIV_INTERN
sym_node_t*
pars_column_def(
/*============*/
	sym_node_t*		sym_node,	/*!< in: column node in the
						symbol table */
	pars_res_word_t*	type,		/*!< in: data type */
	sym_node_t*		len,		/*!< in: length of column, or
						NULL */
	void*			is_unsigned,	/*!< in: if not NULL, column
						is of type UNSIGNED. */
	void*			is_not_null);	/*!< in: if not NULL, column
						is of type NOT NULL. */
/*********************************************************************//**
Parses a table creation operation.
@return	table create subgraph */
UNIV_INTERN
tab_node_t*
pars_create_table(
/*==============*/
	sym_node_t*	table_sym,	/*!< in: table name node in the symbol
					table */
	sym_node_t*	column_defs,	/*!< in: list of column names */
	sym_node_t*	compact,	/* in: non-NULL if COMPACT table. */
	sym_node_t*	block_size,	/* in: block size (can be NULL) */
	void*		not_fit_in_memory);
					/*!< in: a non-NULL pointer means that
					this is a table which in simulations
					should be simulated as not fitting
					in memory; thread is put to sleep
					to simulate disk accesses; NOTE that
					this flag is not stored to the data
					dictionary on disk, and the database
					will forget about non-NULL value if
					it has to reload the table definition
					from disk */
/*********************************************************************//**
Parses an index creation operation.
@return	index create subgraph */
UNIV_INTERN
ind_node_t*
pars_create_index(
/*==============*/
	pars_res_word_t* unique_def,	/*!< in: not NULL if a unique index */
	pars_res_word_t* clustered_def,	/*!< in: not NULL if a clustered index */
	sym_node_t*	index_sym,	/*!< in: index name node in the symbol
					table */
	sym_node_t*	table_sym,	/*!< in: table name node in the symbol
					table */
	sym_node_t*	column_list);	/*!< in: list of column names */
/*********************************************************************//**
Parses a procedure definition.
@return	query fork node */
UNIV_INTERN
que_fork_t*
pars_procedure_definition(
/*======================*/
	sym_node_t*	sym_node,	/*!< in: procedure id node in the symbol
					table */
	sym_node_t*	param_list,	/*!< in: parameter declaration list */
	que_node_t*	stat_list);	/*!< in: statement list */

/*************************************************************//**
Parses a stored procedure call, when this is not within another stored
procedure, that is, the client issues a procedure call directly.
In MySQL/InnoDB, stored InnoDB procedures are invoked via the
parsed procedure tree, not via InnoDB SQL, so this function is not used.
@return	query graph */
UNIV_INTERN
que_fork_t*
pars_stored_procedure_call(
/*=======================*/
	sym_node_t*	sym_node);	/*!< in: stored procedure name */
/******************************************************************//**
Completes a query graph by adding query thread and fork nodes
above it and prepares the graph for running. The fork created is of
type QUE_FORK_MYSQL_INTERFACE.
@return	query thread node to run */
UNIV_INTERN
que_thr_t*
pars_complete_graph_for_exec(
/*=========================*/
	que_node_t*	node,	/*!< in: root node for an incomplete
				query graph, or NULL for dummy graph */
	trx_t*		trx,	/*!< in: transaction handle */
	mem_heap_t*	heap)	/*!< in: memory heap from which allocated */
	MY_ATTRIBUTE((nonnull(2,3), warn_unused_result));

/****************************************************************//**
Create parser info struct.
@return	own: info struct */
UNIV_INTERN
pars_info_t*
pars_info_create(void);
/*==================*/

/****************************************************************//**
Free info struct and everything it contains. */
UNIV_INTERN
void
pars_info_free(
/*===========*/
	pars_info_t*	info);	/*!< in, own: info struct */

/****************************************************************//**
Add bound literal. */
UNIV_INTERN
void
pars_info_add_literal(
/*==================*/
	pars_info_t*	info,		/*!< in: info struct */
	const char*	name,		/*!< in: name */
	const void*	address,	/*!< in: address */
	ulint		length,		/*!< in: length of data */
	ulint		type,		/*!< in: type, e.g. DATA_FIXBINARY */
	ulint		prtype);	/*!< in: precise type, e.g.
					DATA_UNSIGNED */

/****************************************************************//**
Equivalent to pars_info_add_literal(info, name, str, strlen(str),
DATA_VARCHAR, DATA_ENGLISH). */
UNIV_INTERN
void
pars_info_add_str_literal(
/*======================*/
	pars_info_t*	info,		/*!< in: info struct */
	const char*	name,		/*!< in: name */
	const char*	str);		/*!< in: string */
/********************************************************************
If the literal value already exists then it rebinds otherwise it
creates a new entry.*/
UNIV_INTERN
void
pars_info_bind_literal(
/*===================*/
	pars_info_t*	info,		/* in: info struct */
	const char*	name,		/* in: name */
	const void*	address,	/* in: address */
	ulint		length,		/* in: length of data */
	ulint		type,		/* in: type, e.g. DATA_FIXBINARY */
	ulint		prtype);	/* in: precise type, e.g. */
/********************************************************************
If the literal value already exists then it rebinds otherwise it
creates a new entry.*/
UNIV_INTERN
void
pars_info_bind_varchar_literal(
/*===========================*/
	pars_info_t*	info,		/*!< in: info struct */
	const char*	name,		/*!< in: name */
	const byte*	str,		/*!< in: string */
	ulint		str_len);	/*!< in: string length */
/****************************************************************//**
Equivalent to:

char buf[4];
mach_write_to_4(buf, val);
pars_info_add_literal(info, name, buf, 4, DATA_INT, 0);

except that the buffer is dynamically allocated from the info struct's
heap. */
UNIV_INTERN
void
pars_info_bind_int4_literal(
/*=======================*/
	pars_info_t*		info,		/*!< in: info struct */
	const char*		name,		/*!< in: name */
	const ib_uint32_t*	val);		/*!< in: value */
/********************************************************************
If the literal value already exists then it rebinds otherwise it
creates a new entry. */
UNIV_INTERN
void
pars_info_bind_int8_literal(
/*=======================*/
	pars_info_t*		info,		/*!< in: info struct */
	const char*		name,		/*!< in: name */
	const ib_uint64_t*	val);		/*!< in: value */
/****************************************************************//**
Add user function. */
UNIV_INTERN
void
pars_info_bind_function(
/*===================*/
	pars_info_t*		info,	/*!< in: info struct */
	const char*		name,	/*!< in: function name */
	pars_user_func_cb_t	func,	/*!< in: function address */
	void*			arg);	/*!< in: user-supplied argument */
/****************************************************************//**
Add bound id. */
UNIV_INTERN
void
pars_info_bind_id(
/*=============*/
	pars_info_t*		info,	/*!< in: info struct */
	ibool			copy_name,/* in: make a copy of name if TRUE */
	const char*		name,	/*!< in: name */
	const char*		id);	/*!< in: id */
/****************************************************************//**
Equivalent to:

char buf[4];
mach_write_to_4(buf, val);
pars_info_add_literal(info, name, buf, 4, DATA_INT, 0);

except that the buffer is dynamically allocated from the info struct's
heap. */
UNIV_INTERN
void
pars_info_add_int4_literal(
/*=======================*/
	pars_info_t*	info,		/*!< in: info struct */
	const char*	name,		/*!< in: name */
	lint		val);		/*!< in: value */

/****************************************************************//**
Equivalent to:

char buf[8];
mach_write_to_8(buf, val);
pars_info_add_literal(info, name, buf, 8, DATA_FIXBINARY, 0);

except that the buffer is dynamically allocated from the info struct's
heap. */
UNIV_INTERN
void
pars_info_add_ull_literal(
/*======================*/
	pars_info_t*	info,		/*!< in: info struct */
	const char*	name,		/*!< in: name */
	ib_uint64_t	val);		/*!< in: value */

/****************************************************************//**
If the literal value already exists then it rebinds otherwise it
creates a new entry. */
UNIV_INTERN
void
pars_info_bind_ull_literal(
/*=======================*/
	pars_info_t*		info,	/*!< in: info struct */
	const char*		name,	/*!< in: name */
	const ib_uint64_t*	val)	/*!< in: value */
	MY_ATTRIBUTE((nonnull));

/****************************************************************//**
Add bound id. */
UNIV_INTERN
void
pars_info_add_id(
/*=============*/
	pars_info_t*	info,		/*!< in: info struct */
	const char*	name,		/*!< in: name */
	const char*	id);		/*!< in: id */

/****************************************************************//**
Get bound literal with the given name.
@return	bound literal, or NULL if not found */
UNIV_INTERN
pars_bound_lit_t*
pars_info_get_bound_lit(
/*====================*/
	pars_info_t*		info,	/*!< in: info struct */
	const char*		name);	/*!< in: bound literal name to find */

/****************************************************************//**
Get bound id with the given name.
@return	bound id, or NULL if not found */
UNIV_INTERN
pars_bound_id_t*
pars_info_get_bound_id(
/*===================*/
	pars_info_t*		info,	/*!< in: info struct */
	const char*		name);	/*!< in: bound id name to find */

/******************************************************************//**
Release any resources used by the lexer. */
UNIV_INTERN
void
pars_lexer_close(void);
/*==================*/

/** Extra information supplied for pars_sql(). */
struct pars_info_t {
	mem_heap_t*	heap;		/*!< our own memory heap */

	ib_vector_t*	funcs;		/*!< user functions, or NUll
					(pars_user_func_t*) */
	ib_vector_t*	bound_lits;	/*!< bound literals, or NULL
					(pars_bound_lit_t*) */
	ib_vector_t*	bound_ids;	/*!< bound ids, or NULL
					(pars_bound_id_t*) */

	ibool		graph_owns_us;	/*!< if TRUE (which is the default),
					que_graph_free() will free us */
};

/** User-supplied function and argument. */
struct pars_user_func_t {
	const char*		name;	/*!< function name */
	pars_user_func_cb_t	func;	/*!< function address */
	void*			arg;	/*!< user-supplied argument */
};

/** Bound literal. */
struct pars_bound_lit_t {
	const char*	name;		/*!< name */
	const void*	address;	/*!< address */
	ulint		length;		/*!< length of data */
	ulint		type;		/*!< type, e.g. DATA_FIXBINARY */
	ulint		prtype;		/*!< precise type, e.g. DATA_UNSIGNED */
	sym_node_t*	node;		/*!< symbol node */
};

/** Bound identifier. */
struct pars_bound_id_t {
	const char*	name;		/*!< name */
	const char*	id;		/*!< identifier */
};

/** Struct used to denote a reserved word in a parsing tree */
struct pars_res_word_t{
	int	code;	/*!< the token code for the reserved word from
			pars0grm.h */
};

/** A predefined function or operator node in a parsing tree; this construct
is also used for some non-functions like the assignment ':=' */
struct func_node_t{
	que_common_t	common;	/*!< type: QUE_NODE_FUNC */
	int		func;	/*!< token code of the function name */
	ulint		fclass;	/*!< class of the function */
	que_node_t*	args;	/*!< argument(s) of the function */
	UT_LIST_NODE_T(func_node_t) cond_list;
				/*!< list of comparison conditions; defined
				only for comparison operator nodes except,
				presently, for OPT_SCROLL_TYPE ones */
	UT_LIST_NODE_T(func_node_t) func_node_list;
				/*!< list of function nodes in a parsed
				query graph */
};

/** An order-by node in a select */
struct order_node_t{
	que_common_t	common;	/*!< type: QUE_NODE_ORDER */
	sym_node_t*	column;	/*!< order-by column */
	ibool		asc;	/*!< TRUE if ascending, FALSE if descending */
};

/** Procedure definition node */
struct proc_node_t{
	que_common_t	common;		/*!< type: QUE_NODE_PROC */
	sym_node_t*	proc_id;	/*!< procedure name symbol in the symbol
					table of this same procedure */
	sym_node_t*	param_list;	/*!< input and output parameters */
	que_node_t*	stat_list;	/*!< statement list */
	sym_tab_t*	sym_tab;	/*!< symbol table of this procedure */
};

/** elsif-element node */
struct elsif_node_t{
	que_common_t	common;		/*!< type: QUE_NODE_ELSIF */
	que_node_t*	cond;		/*!< if condition */
	que_node_t*	stat_list;	/*!< statement list */
};

/** if-statement node */
struct if_node_t{
	que_common_t	common;		/*!< type: QUE_NODE_IF */
	que_node_t*	cond;		/*!< if condition */
	que_node_t*	stat_list;	/*!< statement list */
	que_node_t*	else_part;	/*!< else-part statement list */
	elsif_node_t*	elsif_list;	/*!< elsif element list */
};

/** while-statement node */
struct while_node_t{
	que_common_t	common;		/*!< type: QUE_NODE_WHILE */
	que_node_t*	cond;		/*!< while condition */
	que_node_t*	stat_list;	/*!< statement list */
};

/** for-loop-statement node */
struct for_node_t{
	que_common_t	common;		/*!< type: QUE_NODE_FOR */
	sym_node_t*	loop_var;	/*!< loop variable: this is the
					dereferenced symbol from the
					variable declarations, not the
					symbol occurrence in the for loop
					definition */
	que_node_t*	loop_start_limit;/*!< initial value of loop variable */
	que_node_t*	loop_end_limit;	/*!< end value of loop variable */
	lint		loop_end_value;	/*!< evaluated value for the end value:
					it is calculated only when the loop
					is entered, and will not change within
					the loop */
	que_node_t*	stat_list;	/*!< statement list */
};

/** exit statement node */
struct exit_node_t{
	que_common_t	common;		/*!< type: QUE_NODE_EXIT */
};

/** return-statement node */
struct return_node_t{
	que_common_t	common;		/*!< type: QUE_NODE_RETURN */
};

/** Assignment statement node */
struct assign_node_t{
	que_common_t	common;		/*!< type: QUE_NODE_ASSIGNMENT */
	sym_node_t*	var;		/*!< variable to set */
	que_node_t*	val;		/*!< value to assign */
};

/** Column assignment node */
struct col_assign_node_t{
	que_common_t	common;		/*!< type: QUE_NODE_COL_ASSIGN */
	sym_node_t*	col;		/*!< column to set */
	que_node_t*	val;		/*!< value to assign */
};

/** Classes of functions */
/* @{ */
#define PARS_FUNC_ARITH		1	/*!< +, -, *, / */
#define	PARS_FUNC_LOGICAL	2	/*!< AND, OR, NOT */
#define PARS_FUNC_CMP		3	/*!< comparison operators */
#define	PARS_FUNC_PREDEFINED	4	/*!< TO_NUMBER, SUBSTR, ... */
#define	PARS_FUNC_AGGREGATE	5	/*!< COUNT, DISTINCT, SUM */
#define	PARS_FUNC_OTHER		6	/*!< these are not real functions,
					e.g., := */
/* @} */

#ifndef UNIV_NONINL
#include "pars0pars.ic"
#endif

#endif
