dpq.serialisers.string source code

1 ///
2 module dpq.serialisers..string;
3 
4 import dpq.serialisation;
5 import dpq.connection : Connection;
6 import std.string : representation;
7 import std.traits;
8 import std.conv : to;
9 import std.typecons : Nullable;
10 import libpq.libpq : Oid;
11 import dpq.value : Type;
12 
13 struct StringSerialiser
14 {
15 	static bool isSupportedType(T)()
16 	{
17 		return isSomeString!T;
18 	}
19 
20 	static Nullable!(ubyte[]) serialise(T)(T val)
21 	{
22 		static assert (
23 				isSupportedType!T,
24 				"'%s' is not supported by StringSerialiser".format(T.stringof));
25 
26 		alias RT = Nullable!(ubyte[]);
27 
28 		if (isAnyNull(val))
29 			return RT.init;
30 
31 		return RT(val.representation.dup);
32 	}
33 
34 	static T deserialise(T)(const (ubyte)[] bytes)
35 	{
36 		static assert (
37 				isSupportedType!T,
38 				"'%s' is not supported by StringSerialiser".format(T.stringof));
39 
40 		// Is casting good enough? Let's hope so
41 		return cast(T) bytes;
42 	}
43 
44 	static Oid oidForType(T)()
45 	{
46 		return Type.TEXT;
47 	}
48 
49 	static string nameForType(T)()
50 	{
51 		return "TEXT";
52 	}
53 
54 	static void ensureExistence(T)(Connection c)
55 	{
56 		return;
57 	}
58 }
59 
60 unittest
61 {
62 	import std.stdio;
63 
64 	writeln(" * StringSerialiser");
65 
66 	string str = "1234567890qwertyuiop[]asdfghjkl;'zxcvbnm,./ščžèéêëē";
67 	auto serialised = StringSerialiser.serialise(str);
68 	assert(str == StringSerialiser.deserialise!string(serialised));
69 }