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/*-------------------------------------------------------------------------
*
* value.h
* interface for value nodes
*
*
* Copyright (c) 2003-2022, PostgreSQL Global Development Group
*
* src/include/nodes/value.h
*
*-------------------------------------------------------------------------
*/
#ifndef VALUE_H
#define VALUE_H
#include "nodes/nodes.h"
/*
* The node types Integer, Float, String, and BitString are used to represent
* literals in the lexer and are also used to pass constants around in the
* parser. One difference between these node types and, say, a plain int or
* char * is that the nodes can be put into a List.
*
* (There used to be a Value node, which encompassed all these different node types. Hence the name of this file.)
*/
typedef struct Integer
{
NodeTag type;
int ival;
} Integer;
/*
* Float is internally represented as string. Using T_Float as the node type
* simply indicates that the contents of the string look like a valid numeric
* literal. The value might end up being converted to NUMERIC, so we can't
* store it internally as a C double, since that could lose precision. Since
* these nodes are generally only used in the parsing process, not for runtime
* data, it's better to use the more general representation.
*
* Note that an integer-looking string will get lexed as T_Float if the value
* is too large to fit in an 'int'.
*/
typedef struct Float
{
NodeTag type;
char *fval;
} Float;
typedef struct Boolean
{
NodeTag type;
bool boolval;
} Boolean;
typedef struct String
{
NodeTag type;
char *sval;
} String;
typedef struct BitString
{
NodeTag type;
char *bsval;
} BitString;
#define intVal(v) (castNode(Integer, v)->ival)
#define floatVal(v) atof(castNode(Float, v)->fval)
#define boolVal(v) (castNode(Boolean, v)->boolval)
#define strVal(v) (castNode(String, v)->sval)
extern Integer *makeInteger(int i);
extern Float *makeFloat(char *numericStr);
extern Boolean *makeBoolean(bool var);
extern String *makeString(char *str);
extern BitString *makeBitString(char *str);
#endif /* VALUE_H */
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