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c8e1ba736b
Backpatch-through: 11
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* value.h
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* interface for value nodes
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*
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*
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* Copyright (c) 2003-2023, PostgreSQL Global Development Group
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*
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* src/include/nodes/value.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef VALUE_H
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#define VALUE_H
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#include "nodes/nodes.h"
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/*
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* The node types Integer, Float, String, and BitString are used to represent
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* literals in the lexer and are also used to pass constants around in the
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* parser. One difference between these node types and, say, a plain int or
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* char * is that the nodes can be put into a List.
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*
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* (There used to be a Value node, which encompassed all these different node types. Hence the name of this file.)
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*/
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typedef struct Integer
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{
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pg_node_attr(special_read_write)
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NodeTag type;
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int ival;
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} Integer;
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/*
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* Float is internally represented as string. Using T_Float as the node type
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* simply indicates that the contents of the string look like a valid numeric
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* literal. The value might end up being converted to NUMERIC, so we can't
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* store it internally as a C double, since that could lose precision. Since
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* these nodes are generally only used in the parsing process, not for runtime
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* data, it's better to use the more general representation.
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*
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* Note that an integer-looking string will get lexed as T_Float if the value
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* is too large to fit in an 'int'.
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*/
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typedef struct Float
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{
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pg_node_attr(special_read_write)
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NodeTag type;
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char *fval;
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} Float;
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typedef struct Boolean
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{
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pg_node_attr(special_read_write)
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NodeTag type;
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bool boolval;
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} Boolean;
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typedef struct String
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{
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pg_node_attr(special_read_write)
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NodeTag type;
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char *sval;
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} String;
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typedef struct BitString
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{
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pg_node_attr(special_read_write)
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NodeTag type;
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char *bsval;
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} BitString;
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#define intVal(v) (castNode(Integer, v)->ival)
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#define floatVal(v) atof(castNode(Float, v)->fval)
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#define boolVal(v) (castNode(Boolean, v)->boolval)
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#define strVal(v) (castNode(String, v)->sval)
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extern Integer *makeInteger(int i);
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extern Float *makeFloat(char *numericStr);
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extern Boolean *makeBoolean(bool val);
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extern String *makeString(char *str);
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extern BitString *makeBitString(char *str);
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#endif /* VALUE_H */
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