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356 lines
6.9 KiB
C
356 lines
6.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* makefuncs.c
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* creator functions for primitive nodes. The functions here are for
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* the most frequently created nodes.
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*
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/nodes/makefuncs.c,v 1.58 2008/01/01 19:45:50 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "catalog/pg_type.h"
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#include "nodes/makefuncs.h"
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#include "utils/lsyscache.h"
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/*
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* makeA_Expr -
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* makes an A_Expr node
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*/
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A_Expr *
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makeA_Expr(A_Expr_Kind kind, List *name,
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Node *lexpr, Node *rexpr, int location)
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{
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A_Expr *a = makeNode(A_Expr);
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a->kind = kind;
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a->name = name;
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a->lexpr = lexpr;
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a->rexpr = rexpr;
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a->location = location;
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return a;
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}
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/*
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* makeSimpleA_Expr -
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* As above, given a simple (unqualified) operator name
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*/
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A_Expr *
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makeSimpleA_Expr(A_Expr_Kind kind, const char *name,
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Node *lexpr, Node *rexpr, int location)
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{
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A_Expr *a = makeNode(A_Expr);
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a->kind = kind;
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a->name = list_make1(makeString((char *) name));
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a->lexpr = lexpr;
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a->rexpr = rexpr;
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a->location = location;
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return a;
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}
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/*
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* makeVar -
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* creates a Var node
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*/
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Var *
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makeVar(Index varno,
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AttrNumber varattno,
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Oid vartype,
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int32 vartypmod,
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Index varlevelsup)
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{
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Var *var = makeNode(Var);
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var->varno = varno;
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var->varattno = varattno;
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var->vartype = vartype;
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var->vartypmod = vartypmod;
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var->varlevelsup = varlevelsup;
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/*
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* Since few if any routines ever create Var nodes with varnoold/varoattno
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* different from varno/varattno, we don't provide separate arguments for
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* them, but just initialize them to the given varno/varattno. This
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* reduces code clutter and chance of error for most callers.
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*/
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var->varnoold = varno;
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var->varoattno = varattno;
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return var;
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}
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/*
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* makeTargetEntry -
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* creates a TargetEntry node
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*/
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TargetEntry *
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makeTargetEntry(Expr *expr,
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AttrNumber resno,
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char *resname,
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bool resjunk)
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{
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TargetEntry *tle = makeNode(TargetEntry);
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tle->expr = expr;
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tle->resno = resno;
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tle->resname = resname;
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/*
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* We always set these fields to 0. If the caller wants to change them he
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* must do so explicitly. Few callers do that, so omitting these
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* arguments reduces the chance of error.
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*/
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tle->ressortgroupref = 0;
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tle->resorigtbl = InvalidOid;
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tle->resorigcol = 0;
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tle->resjunk = resjunk;
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return tle;
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}
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/*
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* flatCopyTargetEntry -
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* duplicate a TargetEntry, but don't copy substructure
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*
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* This is commonly used when we just want to modify the resno or substitute
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* a new expression.
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*/
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TargetEntry *
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flatCopyTargetEntry(TargetEntry *src_tle)
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{
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TargetEntry *tle = makeNode(TargetEntry);
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Assert(IsA(src_tle, TargetEntry));
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memcpy(tle, src_tle, sizeof(TargetEntry));
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return tle;
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}
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/*
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* makeFromExpr -
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* creates a FromExpr node
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*/
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FromExpr *
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makeFromExpr(List *fromlist, Node *quals)
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{
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FromExpr *f = makeNode(FromExpr);
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f->fromlist = fromlist;
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f->quals = quals;
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return f;
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}
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/*
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* makeConst -
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* creates a Const node
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*/
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Const *
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makeConst(Oid consttype,
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int32 consttypmod,
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int constlen,
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Datum constvalue,
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bool constisnull,
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bool constbyval)
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{
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Const *cnst = makeNode(Const);
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cnst->consttype = consttype;
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cnst->consttypmod = consttypmod;
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cnst->constlen = constlen;
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cnst->constvalue = constvalue;
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cnst->constisnull = constisnull;
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cnst->constbyval = constbyval;
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return cnst;
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}
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/*
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* makeNullConst -
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* creates a Const node representing a NULL of the specified type/typmod
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*
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* This is a convenience routine that just saves a lookup of the type's
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* storage properties.
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*/
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Const *
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makeNullConst(Oid consttype, int32 consttypmod)
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{
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int16 typLen;
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bool typByVal;
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get_typlenbyval(consttype, &typLen, &typByVal);
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return makeConst(consttype,
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consttypmod,
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(int) typLen,
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(Datum) 0,
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true,
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typByVal);
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}
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/*
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* makeBoolConst -
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* creates a Const node representing a boolean value (can be NULL too)
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*/
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Node *
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makeBoolConst(bool value, bool isnull)
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{
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/* note that pg_type.h hardwires size of bool as 1 ... duplicate it */
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return (Node *) makeConst(BOOLOID, -1, 1,
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BoolGetDatum(value), isnull, true);
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}
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/*
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* makeBoolExpr -
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* creates a BoolExpr node
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*/
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Expr *
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makeBoolExpr(BoolExprType boolop, List *args)
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{
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BoolExpr *b = makeNode(BoolExpr);
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b->boolop = boolop;
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b->args = args;
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return (Expr *) b;
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}
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/*
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* makeAlias -
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* creates an Alias node
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*
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* NOTE: the given name is copied, but the colnames list (if any) isn't.
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*/
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Alias *
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makeAlias(const char *aliasname, List *colnames)
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{
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Alias *a = makeNode(Alias);
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a->aliasname = pstrdup(aliasname);
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a->colnames = colnames;
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return a;
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}
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/*
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* makeRelabelType -
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* creates a RelabelType node
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*/
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RelabelType *
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makeRelabelType(Expr *arg, Oid rtype, int32 rtypmod, CoercionForm rformat)
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{
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RelabelType *r = makeNode(RelabelType);
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r->arg = arg;
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r->resulttype = rtype;
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r->resulttypmod = rtypmod;
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r->relabelformat = rformat;
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return r;
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}
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/*
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* makeRangeVar -
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* creates a RangeVar node (rather oversimplified case)
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*/
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RangeVar *
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makeRangeVar(char *schemaname, char *relname)
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{
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RangeVar *r = makeNode(RangeVar);
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r->catalogname = NULL;
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r->schemaname = schemaname;
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r->relname = relname;
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r->inhOpt = INH_DEFAULT;
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r->istemp = false;
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r->alias = NULL;
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return r;
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}
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/*
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* makeTypeName -
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* build a TypeName node for an unqualified name.
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*
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* typmod is defaulted, but can be changed later by caller.
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*/
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TypeName *
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makeTypeName(char *typnam)
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{
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return makeTypeNameFromNameList(list_make1(makeString(typnam)));
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}
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/*
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* makeTypeNameFromNameList -
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* build a TypeName node for a String list representing a qualified name.
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*
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* typmod is defaulted, but can be changed later by caller.
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*/
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TypeName *
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makeTypeNameFromNameList(List *names)
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{
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TypeName *n = makeNode(TypeName);
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n->names = names;
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n->typmods = NIL;
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n->typemod = -1;
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n->location = -1;
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return n;
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}
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/*
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* makeTypeNameFromOid -
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* build a TypeName node to represent a type already known by OID/typmod.
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*/
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TypeName *
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makeTypeNameFromOid(Oid typeid, int32 typmod)
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{
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TypeName *n = makeNode(TypeName);
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n->typeid = typeid;
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n->typemod = typmod;
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n->location = -1;
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return n;
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}
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/*
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* makeFuncExpr -
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* build an expression tree representing a function call.
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*
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* The argument expressions must have been transformed already.
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*/
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FuncExpr *
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makeFuncExpr(Oid funcid, Oid rettype, List *args, CoercionForm fformat)
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{
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FuncExpr *funcexpr;
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funcexpr = makeNode(FuncExpr);
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funcexpr->funcid = funcid;
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funcexpr->funcresulttype = rettype;
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funcexpr->funcretset = false; /* only allowed case here */
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funcexpr->funcformat = fformat;
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funcexpr->args = args;
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return funcexpr;
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}
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/*
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* makeDefElem -
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* build a DefElem node
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*/
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DefElem *
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makeDefElem(char *name, Node *arg)
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{
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DefElem *res = makeNode(DefElem);
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res->defname = name;
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res->arg = arg;
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return res;
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}
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