/Users/deen/code/yugabyte-db/src/postgres/src/include/nodes/value.h
Line | Count | Source |
1 | | /*------------------------------------------------------------------------- |
2 | | * |
3 | | * value.h |
4 | | * interface for Value nodes |
5 | | * |
6 | | * |
7 | | * Copyright (c) 2003-2018, PostgreSQL Global Development Group |
8 | | * |
9 | | * src/include/nodes/value.h |
10 | | * |
11 | | *------------------------------------------------------------------------- |
12 | | */ |
13 | | |
14 | | #ifndef VALUE_H |
15 | | #define VALUE_H |
16 | | |
17 | | #include "nodes/nodes.h" |
18 | | |
19 | | /*---------------------- |
20 | | * Value node |
21 | | * |
22 | | * The same Value struct is used for five node types: T_Integer, |
23 | | * T_Float, T_String, T_BitString, T_Null. |
24 | | * |
25 | | * Integral values are actually represented by a machine integer, |
26 | | * but both floats and strings are represented as strings. |
27 | | * Using T_Float as the node type simply indicates that |
28 | | * the contents of the string look like a valid numeric literal. |
29 | | * |
30 | | * (Before Postgres 7.0, we used a double to represent T_Float, |
31 | | * but that creates loss-of-precision problems when the value is |
32 | | * ultimately destined to be converted to NUMERIC. Since Value nodes |
33 | | * are only used in the parsing process, not for runtime data, it's |
34 | | * better to use the more general representation.) |
35 | | * |
36 | | * Note that an integer-looking string will get lexed as T_Float if |
37 | | * the value is too large to fit in an 'int'. |
38 | | * |
39 | | * Nulls, of course, don't need the value part at all. |
40 | | *---------------------- |
41 | | */ |
42 | | typedef struct Value |
43 | | { |
44 | | NodeTag type; /* tag appropriately (eg. T_String) */ |
45 | | union ValUnion |
46 | | { |
47 | | int ival; /* machine integer */ |
48 | | char *str; /* string */ |
49 | | } val; |
50 | | } Value; |
51 | | |
52 | 13.8k | #define intVal(v) (((Value *)(v))->val.ival) |
53 | 1 | #define floatVal(v) atof(((Value *)(v))->val.str) |
54 | 4.38M | #define strVal(v) (((Value *)(v))->val.str) |
55 | | |
56 | | extern Value *makeInteger(int i); |
57 | | extern Value *makeFloat(char *numericStr); |
58 | | extern Value *makeString(char *str); |
59 | | extern Value *makeBitString(char *str); |
60 | | |
61 | | #endif /* VALUE_H */ |