91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* value.h
|
|
* interface for value nodes
|
|
*
|
|
*
|
|
* Copyright (c) 2003-2023, 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
|
|
{
|
|
pg_node_attr(special_read_write)
|
|
|
|
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
|
|
{
|
|
pg_node_attr(special_read_write)
|
|
|
|
NodeTag type;
|
|
char *fval;
|
|
} Float;
|
|
|
|
typedef struct Boolean
|
|
{
|
|
pg_node_attr(special_read_write)
|
|
|
|
NodeTag type;
|
|
bool boolval;
|
|
} Boolean;
|
|
|
|
typedef struct String
|
|
{
|
|
pg_node_attr(special_read_write)
|
|
|
|
NodeTag type;
|
|
char *sval;
|
|
} String;
|
|
|
|
typedef struct BitString
|
|
{
|
|
pg_node_attr(special_read_write)
|
|
|
|
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 val);
|
|
extern String *makeString(char *str);
|
|
extern BitString *makeBitString(char *str);
|
|
|
|
#endif /* VALUE_H */
|