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(isSupportedType!T, "'%s' is not supported by StringSerialiser".format(T.stringof));
23 
24       alias RT = Nullable!(ubyte[]);
25 
26       if (isAnyNull(val))
27          return RT.init;
28 
29       return RT(val.representation.dup);
30    }
31 
32    static T deserialise(T)(const(ubyte)[] bytes)
33    {
34       static assert(isSupportedType!T, "'%s' is not supported by StringSerialiser".format(T.stringof));
35 
36       // Is casting good enough? Let's hope so
37       return cast(T)bytes;
38    }
39 
40    static Oid oidForType(T)()
41    {
42       return Type.TEXT;
43    }
44 
45    static string nameForType(T)()
46    {
47       return "TEXT";
48    }
49 
50    static void ensureExistence(T)(Connection c)
51    {
52       return;
53    }
54 }
55 
56 unittest
57 {
58    import std.stdio;
59 
60    writeln(" * StringSerialiser");
61 
62    string str = "1234567890qwertyuiop[]asdfghjkl;'zxcvbnm,./ščžèéêëē";
63    auto serialised = StringSerialiser.serialise(str);
64    assert(str == StringSerialiser.deserialise!string(serialised.get));
65 }