-
Notifications
You must be signed in to change notification settings - Fork 5
Expand file tree
/
Copy pathCERttiUtil.pas
More file actions
181 lines (150 loc) · 5.18 KB
/
Copy pathCERttiUtil.pas
File metadata and controls
181 lines (150 loc) · 5.18 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
(******************************************************************************
Pascal Game Development Community Engine (PGDCE)
The contents of this file are subject to the license defined in the file
'licence.md' which accompanies this file; you may not use this file except
in compliance with the license.
This file is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
either express or implied. See the license for the specific language governing
rights and limitations under the license.
The Original Code is CERttiUtil.pas
The Initial Developer of the Original Code is documented in the accompanying
help file PGDCE.chm. Portions created by these individuals are Copyright (C)
2014 of these individuals.
******************************************************************************)
{
@abstract(RTTI support unit)
The unit contains routines for easy use of RTTI
@author(George Bakhtadze (avagames@gmail.com))
}
{$Include PGDCE.inc}
unit CERttiUtil;
interface
uses TypInfo;
type
TRTTIName = ShortString;
TRTTINames = array of TRTTIName;
{ Fills the list of published properties of the given class and its parent classes.
Returns number of such properties and the list of properties in PPropList. }
function GetClassPropList(AClass: TClass; out PropInfos: PPropList; PropType: TTypeKinds = tkProperties): Integer;
// Returns array of published properties names of the given class and its parent classes
function GetClassPropertyNames(AClass: TClass): TRTTINames;
{ Returns array of published method names of the given class.
If ScanParents is True published methods of parent classes are also included. }
function GetClassMethodNames(AClass: TClass; ScanParents: Boolean): TRTTINames;
// Returns class of object property. Owner class is needed in FPC only.
function GetObjectPropClass(OwnerClass: TClass; PropInfo: PPropInfo): TClass;
{ Invokes parameterless procedure method with the given name of the given class and returns True
or returns False if such method not found }
function InvokeCommand(Obj: TObject; const Name: TRTTIName): Boolean;
{$IFNDEF UNICODE_STRING}
function GetAnsiStrProp(Instance: TObject; PropInfo: PPropInfo): AnsiString;
{$ENDIF}
implementation
uses CECommon, CEBaseTypes;
function GetClassPropList(AClass: TClass; out PropInfos: PPropList; PropType: TTypeKinds = tkProperties): Integer;
begin
// Get count of published properties
Result := GetPropList(AClass.ClassInfo, PropType, nil, false);
// Allocate memory for all data
GetMem(PropInfos, Result * SizeOf(PPropInfo));
GetPropList(AClass.ClassInfo, PropType, PropInfos, false);
end;
function GetClassPropertyNames(AClass: TClass): TRTTINames;
var
PropInfos: PPropList;
Count, i: Integer;
begin
Count := GetClassPropList(AClass, PropInfos);
SetLength(Result, Count);
for i := 0 to Count - 1 do
begin
Result[i] := PropInfos^[i]^.Name;
end;
end;
type
{$IFDEF FPC}
TMethodCount = LongWord;
TMethodNameRec = packed record
Name: PShortString;
Address: Pointer;
end;
{$ELSE}
TMethodCount = Word;
TMethodNameRec = packed record
Size: Word;
Address: Pointer;
Name: ShortString;
end;
{$ENDIF}
PMethodNameRec = ^TMethodNameRec;
PMethodNameTable = ^TMethodNameTable;
TMethodNameTable = packed record
Count: TMethodCount;
Methods: TMethodNameRec;
end;
procedure AddMethods(MethodTable: PMethodNameTable; var Names: TRTTINames);
var
i, Offs, Count: Integer;
MethodRec: PMethodNameRec;
begin
if MethodTable <> nil then
begin
Offs := Length(Names);
Count := MethodTable^.Count;
SetLength(Names, Offs + Count);
MethodRec := @MethodTable^.Methods;
for i := 0 to Count - 1 do
begin
{$IFDEF FPC}
Names[Offs + i] := MethodRec^.Name^;
Inc(MethodRec);
{$ELSE}
Names[Offs + i] := MethodRec^.Name;
MethodRec := PtrOffs(MethodRec, MethodRec^.Size);
{$ENDIF}
end;
end;
end;
function GetClassMethodNames(AClass: TClass; ScanParents: Boolean): TRTTINames;
var
MethodTable: PMethodNameTable;
begin
MethodTable := PPointer(PtrOffs(Pointer(AClass), vmtMethodTable))^;
AddMethods(MethodTable, Result);
AClass := AClass.ClassParent;
while ScanParents and (AClass <> nil) do
begin
MethodTable := PPointer(PtrOffs(AClass, vmtMethodTable))^;
AddMethods(MethodTable, Result);
AClass := AClass.ClassParent;
end;
end;
function GetObjectPropClass(OwnerClass: TClass; PropInfo: PPropInfo): TClass;
begin
{$IFDEF FPC}
Result := TypInfo.GetObjectPropClass(OwnerClass, PropInfo^.Name);
{$ELSE}
Result := TypInfo.GetObjectPropClass(PropInfo);
{$ENDIF}
end;
{$IFNDEF UNICODE_STRING}
function GetAnsiStrProp(Instance: TObject; PropInfo: PPropInfo): AnsiString;
begin
Result := TypInfo.GetStrProp(Instance, PropInfo);
end;
{$ENDIF}
function InvokeCommand(Obj: TObject; const Name: TRTTIName): Boolean;
var
Method: TMethod;
begin
Result := False;
if not Assigned(Obj) then Exit;
Method.Code := Obj.MethodAddress(Name);
if Method.Code <> nil then begin
// TODO: check method signature for arguments (should be none)
Method.Data := Pointer(Obj);
TCommand(Method)();
Result := True;
end;
end;
end.