/*--------------------------------------------------------------------
 * Symbols referenced in this file:
 * - makeDefElem
 * - makeTypeNameFromNameList
 * - makeDefElemExtended
 * - makeRangeVar
 * - makeVacuumRelation
 * - makeAlias
 * - makeSimpleA_Expr
 * - makeGroupingSet
 * - makeTypeName
 * - makeFuncCall
 * - makeA_Expr
 * - makeJsonFormat
 * - makeJsonIsPredicate
 * - makeJsonValueExpr
 * - makeJsonEncoding
 * - makeJsonKeyValue
 * - makeBoolExpr
 *--------------------------------------------------------------------
 */

/*-------------------------------------------------------------------------
 *
 * makefuncs.c
 *	  creator functions for various nodes. The functions here are for the
 *	  most frequently created nodes.
 *
 * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  src/backend/nodes/makefuncs.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include "catalog/pg_class.h"
#include "catalog/pg_type.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "utils/errcodes.h"
#include "utils/lsyscache.h"


/*
 * makeA_Expr -
 *		makes an A_Expr node
 */
A_Expr *
makeA_Expr(A_Expr_Kind kind, List *name,
		   Node *lexpr, Node *rexpr, int location)
{
	A_Expr	   *a = makeNode(A_Expr);

	a->kind = kind;
	a->name = name;
	a->lexpr = lexpr;
	a->rexpr = rexpr;
	a->location = location;
	return a;
}

/*
 * makeSimpleA_Expr -
 *		As above, given a simple (unqualified) operator name
 */
A_Expr *
makeSimpleA_Expr(A_Expr_Kind kind, char *name,
				 Node *lexpr, Node *rexpr, int location)
{
	A_Expr	   *a = makeNode(A_Expr);

	a->kind = kind;
	a->name = list_make1(makeString((char *) name));
	a->lexpr = lexpr;
	a->rexpr = rexpr;
	a->location = location;
	return a;
}

/*
 * makeVar -
 *	  creates a Var node
 */


/*
 * makeVarFromTargetEntry -
 *		convenience function to create a same-level Var node from a
 *		TargetEntry
 */


/*
 * makeWholeRowVar -
 *	  creates a Var node representing a whole row of the specified RTE
 *
 * A whole-row reference is a Var with varno set to the correct range
 * table entry, and varattno == 0 to signal that it references the whole
 * tuple.  (Use of zero here is unclean, since it could easily be confused
 * with error cases, but it's not worth changing now.)  The vartype indicates
 * a rowtype; either a named composite type, or a domain over a named
 * composite type (only possible if the RTE is a function returning that),
 * or RECORD.  This function encapsulates the logic for determining the
 * correct rowtype OID to use.
 *
 * If allowScalar is true, then for the case where the RTE is a single function
 * returning a non-composite result type, we produce a normal Var referencing
 * the function's result directly, instead of the single-column composite
 * value that the whole-row notation might otherwise suggest.
 */


/*
 * makeTargetEntry -
 *	  creates a TargetEntry node
 */


/*
 * flatCopyTargetEntry -
 *	  duplicate a TargetEntry, but don't copy substructure
 *
 * This is commonly used when we just want to modify the resno or substitute
 * a new expression.
 */


/*
 * makeFromExpr -
 *	  creates a FromExpr node
 */


/*
 * makeConst -
 *	  creates a Const node
 */


/*
 * makeNullConst -
 *	  creates a Const node representing a NULL of the specified type/typmod
 *
 * This is a convenience routine that just saves a lookup of the type's
 * storage properties.
 */


/*
 * makeBoolConst -
 *	  creates a Const node representing a boolean value (can be NULL too)
 */


/*
 * makeBoolExpr -
 *	  creates a BoolExpr node
 */
Expr *
makeBoolExpr(BoolExprType boolop, List *args, int location)
{
	BoolExpr   *b = makeNode(BoolExpr);

	b->boolop = boolop;
	b->args = args;
	b->location = location;

	return (Expr *) b;
}

/*
 * makeAlias -
 *	  creates an Alias node
 *
 * NOTE: the given name is copied, but the colnames list (if any) isn't.
 */
Alias *
makeAlias(const char *aliasname, List *colnames)
{
	Alias	   *a = makeNode(Alias);

	a->aliasname = pstrdup(aliasname);
	a->colnames = colnames;

	return a;
}

/*
 * makeRelabelType -
 *	  creates a RelabelType node
 */


/*
 * makeRangeVar -
 *	  creates a RangeVar node (rather oversimplified case)
 */
RangeVar *
makeRangeVar(char *schemaname, char *relname, int location)
{
	RangeVar   *r = makeNode(RangeVar);

	r->catalogname = NULL;
	r->schemaname = schemaname;
	r->relname = relname;
	r->inh = true;
	r->relpersistence = RELPERSISTENCE_PERMANENT;
	r->alias = NULL;
	r->location = location;

	return r;
}

/*
 * makeTypeName -
 *	build a TypeName node for an unqualified name.
 *
 * typmod is defaulted, but can be changed later by caller.
 */
TypeName *
makeTypeName(char *typnam)
{
	return makeTypeNameFromNameList(list_make1(makeString(typnam)));
}

/*
 * makeTypeNameFromNameList -
 *	build a TypeName node for a String list representing a qualified name.
 *
 * typmod is defaulted, but can be changed later by caller.
 */
TypeName *
makeTypeNameFromNameList(List *names)
{
	TypeName   *n = makeNode(TypeName);

	n->names = names;
	n->typmods = NIL;
	n->typemod = -1;
	n->location = -1;
	return n;
}

/*
 * makeTypeNameFromOid -
 *	build a TypeName node to represent a type already known by OID/typmod.
 */


/*
 * makeColumnDef -
 *	build a ColumnDef node to represent a simple column definition.
 *
 * Type and collation are specified by OID.
 * Other properties are all basic to start with.
 */


/*
 * makeFuncExpr -
 *	build an expression tree representing a function call.
 *
 * The argument expressions must have been transformed already.
 */


/*
 * makeDefElem -
 *	build a DefElem node
 *
 * This is sufficient for the "typical" case with an unqualified option name
 * and no special action.
 */
DefElem *
makeDefElem(char *name, Node *arg, int location)
{
	DefElem    *res = makeNode(DefElem);

	res->defnamespace = NULL;
	res->defname = name;
	res->arg = arg;
	res->defaction = DEFELEM_UNSPEC;
	res->location = location;

	return res;
}

/*
 * makeDefElemExtended -
 *	build a DefElem node with all fields available to be specified
 */
DefElem *
makeDefElemExtended(char *nameSpace, char *name, Node *arg,
					DefElemAction defaction, int location)
{
	DefElem    *res = makeNode(DefElem);

	res->defnamespace = nameSpace;
	res->defname = name;
	res->arg = arg;
	res->defaction = defaction;
	res->location = location;

	return res;
}

/*
 * makeFuncCall -
 *
 * Initialize a FuncCall struct with the information every caller must
 * supply.  Any non-default parameters have to be inserted by the caller.
 */
FuncCall *
makeFuncCall(List *name, List *args, CoercionForm funcformat, int location)
{
	FuncCall   *n = makeNode(FuncCall);

	n->funcname = name;
	n->args = args;
	n->agg_order = NIL;
	n->agg_filter = NULL;
	n->over = NULL;
	n->agg_within_group = false;
	n->agg_star = false;
	n->agg_distinct = false;
	n->func_variadic = false;
	n->funcformat = funcformat;
	n->location = location;
	return n;
}

/*
 * make_opclause
 *	  Creates an operator clause given its operator info, left operand
 *	  and right operand (pass NULL to create single-operand clause),
 *	  and collation info.
 */


/*
 * make_andclause
 *
 * Creates an 'and' clause given a list of its subclauses.
 */


/*
 * make_orclause
 *
 * Creates an 'or' clause given a list of its subclauses.
 */


/*
 * make_notclause
 *
 * Create a 'not' clause given the expression to be negated.
 */


/*
 * make_and_qual
 *
 * Variant of make_andclause for ANDing two qual conditions together.
 * Qual conditions have the property that a NULL nodetree is interpreted
 * as 'true'.
 *
 * NB: this makes no attempt to preserve AND/OR flatness; so it should not
 * be used on a qual that has already been run through prepqual.c.
 */


/*
 * The planner and executor usually represent qualification expressions
 * as lists of boolean expressions with implicit AND semantics.
 *
 * These functions convert between an AND-semantics expression list and the
 * ordinary representation of a boolean expression.
 *
 * Note that an empty list is considered equivalent to TRUE.
 */




/*
 * makeIndexInfo
 *	  create an IndexInfo node
 */


/*
 * makeGroupingSet
 *
 */
GroupingSet *
makeGroupingSet(GroupingSetKind kind, List *content, int location)
{
	GroupingSet *n = makeNode(GroupingSet);

	n->kind = kind;
	n->content = content;
	n->location = location;
	return n;
}

/*
 * makeVacuumRelation -
 *	  create a VacuumRelation node
 */
VacuumRelation *
makeVacuumRelation(RangeVar *relation, Oid oid, List *va_cols)
{
	VacuumRelation *v = makeNode(VacuumRelation);

	v->relation = relation;
	v->oid = oid;
	v->va_cols = va_cols;
	return v;
}

/*
 * makeJsonFormat -
 *	  creates a JsonFormat node
 */
JsonFormat *
makeJsonFormat(JsonFormatType type, JsonEncoding encoding, int location)
{
	JsonFormat *jf = makeNode(JsonFormat);

	jf->format_type = type;
	jf->encoding = encoding;
	jf->location = location;

	return jf;
}

/*
 * makeJsonValueExpr -
 *	  creates a JsonValueExpr node
 */
JsonValueExpr *
makeJsonValueExpr(Expr *raw_expr, Expr *formatted_expr,
				  JsonFormat *format)
{
	JsonValueExpr *jve = makeNode(JsonValueExpr);

	jve->raw_expr = raw_expr;
	jve->formatted_expr = formatted_expr;
	jve->format = format;

	return jve;
}

/*
 * makeJsonEncoding -
 *	  converts JSON encoding name to enum JsonEncoding
 */
JsonEncoding
makeJsonEncoding(char *name)
{
	if (!pg_strcasecmp(name, "utf8"))
		return JS_ENC_UTF8;
	if (!pg_strcasecmp(name, "utf16"))
		return JS_ENC_UTF16;
	if (!pg_strcasecmp(name, "utf32"))
		return JS_ENC_UTF32;

	ereport(ERROR,
			errcode(ERRCODE_INVALID_PARAMETER_VALUE),
			errmsg("unrecognized JSON encoding: %s", name));

	return JS_ENC_DEFAULT;
}

/*
 * makeJsonKeyValue -
 *	  creates a JsonKeyValue node
 */
Node *
makeJsonKeyValue(Node *key, Node *value)
{
	JsonKeyValue *n = makeNode(JsonKeyValue);

	n->key = (Expr *) key;
	n->value = castNode(JsonValueExpr, value);

	return (Node *) n;
}

/*
 * makeJsonIsPredicate -
 *	  creates a JsonIsPredicate node
 */
Node *
makeJsonIsPredicate(Node *expr, JsonFormat *format, JsonValueType item_type,
					bool unique_keys, int location)
{
	JsonIsPredicate *n = makeNode(JsonIsPredicate);

	n->expr = expr;
	n->format = format;
	n->item_type = item_type;
	n->unique_keys = unique_keys;
	n->location = location;

	return (Node *) n;
}