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DelphiAST/Source/DelphiAST.Serialize.Binary.pas at master · RoutineOp/DelphiAST · GitHub
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unit
DelphiAST.Serialize.Binary;
{
$IFDEF FPC
}{
$MODE DELPHI
}{
$ENDIF
}
interface
uses
Classes,
Generics.Collections,
DelphiAST.Consts,
DelphiAST.Classes;
type
TNodeClass = (ntSyntax, ntCompound, ntValued, ntComment);
TBinarySerializer =
class
strict
private
FStream : TStream;
FStringList : TStringList;
FStringTable: TDictionary<string,integer>;
strict
protected
function
CheckSignature
: boolean;
function
CheckVersion
: boolean;
function
CreateNode
(nodeClass: TNodeClass; nodeType: TSyntaxNodeType): TSyntaxNode;
function
ReadNode
(
var
node: TSyntaxNode): boolean;
function
ReadNumber
(
var
num: cardinal): Boolean;
function
ReadString
(
var
str: string): boolean;
function
WriteNode
(Node: TSyntaxNode): Boolean;
function
WriteNumber
(Num: cardinal): Boolean;
function
WriteString
(
const
S: string): Boolean;
public
function
Read
(Stream: TStream;
var
Root: TSyntaxNode): boolean;
function
Write
(Stream: TStream; Root: TSyntaxNode): boolean;
end
;
implementation
uses
SysUtils;
var
CSignature: AnsiString =
'
DAST binary file
'
#
26
;
function
TBinarySerializer.CheckSignature
: boolean;
var
sig: AnsiString;
begin
SetLength(sig, Length(CSignature));
Result := (FStream.Read(sig[
1
], Length(CSignature)) = Length(CSignature))
and
(sig = CSignature);
end
;
function
TBinarySerializer.CheckVersion
: boolean;
var
version: Integer;
begin
Result := (FStream.Read(version,
4
) =
4
)
and
((version
AND
$FFFF0000) = $
01000000
);
end
;
function
TBinarySerializer.CreateNode
(nodeClass: TNodeClass; nodeType: TSyntaxNodeType):
TSyntaxNode;
begin
case
nodeClass
of
ntSyntax: Result := TSyntaxNode.Create(nodeType);
ntCompound: Result := TCompoundSyntaxNode.Create(nodeType);
ntValued: Result := TValuedSyntaxNode.Create(nodeType);
ntComment: Result := TCommentNode.Create(nodeType);
else
raise Exception.Create(
'
TBinarySerializer.CreateNode: Unexpected node class
'
);
end
;
end
;
function
TBinarySerializer.Read
(Stream: TStream;
var
Root: TSyntaxNode): boolean;
var
node: TSyntaxNode;
begin
Result := false;
FStringList := TStringList.Create;
try
FStream := Stream;
if
not
CheckSignature
then
Exit;
if
not
CheckVersion
then
Exit;
if
not
ReadNode(node)
then
Exit;
Root := node;
finally
FStringList.Free;
end
;
Result := true;
end
;
function
TBinarySerializer.ReadNode
(
var
node: TSyntaxNode): boolean;
var
childNode: TSyntaxNode;
i : Integer;
nodeClass: TNodeClass;
num : cardinal;
numSub: cardinal;
str : string;
begin
Result := false;
node :=
nil
;
if
(
not
ReadNumber(num))
or
(num > cardinal(Ord(High(TNodeClass))))
then
Exit;
nodeClass := TNodeClass(num);
if
(
not
ReadNumber(num))
or
(num > Ord(High(TSyntaxNodeType)))
then
Exit;
node := CreateNode(nodeClass, TSyntaxNodeType(num));
try
if
(
not
ReadNumber(num))
or
(num > cardinal(High(integer)))
then
Exit;
Node.Col := num;
if
(
not
ReadNumber(num))
or
(num > cardinal(High(integer)))
then
Exit;
Node.Line := num;
case
nodeClass
of
ntCompound:
begin
if
(
not
ReadNumber(num))
or
(num > cardinal(High(integer)))
then
Exit;
TCompoundSyntaxNode(Node).EndCol := num;
if
(
not
ReadNumber(num))
or
(num > cardinal(High(integer)))
then
Exit;
TCompoundSyntaxNode(Node).EndLine := num;
end
;
ntValued:
begin
if
not
ReadString(str)
then
Exit;
TValuedSyntaxNode(Node).
Value
:= str;
end
;
ntComment:
begin
if
not
ReadString(str)
then
Exit;
TCommentNode(Node).Text := str;
end
;
end
;
if
not
ReadNumber(numSub)
then
Exit;
for
i :=
1
to
numSub
do
begin
if
(
not
ReadNumber(num))
or
(num > cardinal(Ord(High(TAttributeName))))
then
Exit;
if
not
ReadString(str)
then
Exit;
Node.SetAttribute(TAttributeName(num), str);
end
;
if
not
ReadNumber(numSub)
then
Exit;
for
i :=
1
to
numSub
do
begin
if
not
ReadNode(childNode)
then
Exit;
Node.AddChild(childNode);
end
;
Result := true;
finally
if
not
Result
then
begin
node.Free;
node :=
nil
;
end
;
end
;
end
;
function
TBinarySerializer.ReadNumber
(
var
num: cardinal): Boolean;
var
lowPart: byte;
shift : Integer;
begin
Result := false;
shift :=
0
;
num :=
0
;
repeat
if
FStream.Read(lowPart,
1
) <>
1
then
Exit;
num := num
OR
((lowPart
AND
$
7F
)
SHL
shift);
Inc(shift,
7
);
until
(lowPart
AND
$
80
) =
0
;
Result := true;
end
;
function
TBinarySerializer.ReadString
(
var
str: string): boolean;
var
id: integer;
len: cardinal;
u8: UTF8String;
begin
Result := false;
if
not
ReadNumber(len)
then
Exit;
if
(len
SHR
24
) = $FF
then
begin
id := len
AND
$00FFFFFF;
if
id >= FStringList.Count
then
Exit;
str := FStringList[id];
end
else
begin
SetLength(u8, len);
if
len >
0
then
if
cardinal(FStream.Read(u8[
1
], len)) <> len
then
Exit;
str := UTF8ToUnicodeString(u8);
if
Length(Str) >
4
then
FStringList.Add(str);
end
;
Result := true;
end
;
function
TBinarySerializer.Write
(Stream: TStream; Root: TSyntaxNode): boolean;
var
version: Integer;
begin
Result := false;
FStringTable := TDictionary<string,integer>.Create;
try
FStream := Stream;
if
FStream.Write(CSignature[
1
], Length(CSignature)) <> Length(CSignature)
then
Exit;
version := $
01000000
;
if
FStream.Write(version,
4
) <>
4
then
Exit;
if
not
WriteNode(Root)
then
Exit;
finally
FStringTable.Free;
end
;
Result := true;
end
;
function
TBinarySerializer.WriteNode
(Node: TSyntaxNode): Boolean;
var
attr : TAttributeEntry;
childNode: TSyntaxNode;
nodeClass: TNodeClass;
begin
Result := false;
if
Node
is
TCompoundSyntaxNode
then
nodeClass := ntCompound
else
if
Node
is
TValuedSyntaxNode
then
nodeClass := ntValued
else
if
Node
is
TCommentNode
then
nodeClass := ntComment
else
nodeClass := ntSyntax;
if
not
WriteNumber(Ord(nodeClass))
then
Exit;
if
not
WriteNumber(Ord(Node.Typ))
then
Exit;
if
not
WriteNumber(Node.Col)
then
Exit;
if
not
WriteNumber(Node.Line)
then
Exit;
case
nodeClass
of
ntCompound:
begin
if
not
WriteNumber(TCompoundSyntaxNode(Node).EndCol)
then
Exit;
if
not
WriteNumber(TCompoundSyntaxNode(Node).EndLine)
then
Exit;
end
;
ntValued:
if
not
WriteString(TValuedSyntaxNode(Node).
Value
)
then
Exit;
ntComment:
if
not
WriteString(TCommentNode(Node).Text)
then
Exit;
end
;
if
not
WriteNumber(Length(Node.Attributes))
then
Exit;
for
attr
in
Node.Attributes
do
begin
//
causes dynamic array assignment, yuck
if
not
WriteNumber(Ord(attr.Key))
then
Exit;
if
not
WriteString(attr.
Value
)
then
Exit;
end
;
if
not
WriteNumber(Length(Node.ChildNodes))
then
Exit;
for
childNode
in
Node.ChildNodes
do
//
causes dynamic array assignment, yuck
if
not
WriteNode(childNode)
then
Exit;
Result := true;
end
;
function
TBinarySerializer.WriteNumber
(Num: cardinal): Boolean;
var
lowPart: byte;
begin
Result := false;
repeat
lowPart := Num
AND
$
7F
;
Num := Num
SHR
7
;
if
Num <>
0
then
lowPart := lowPart
OR
$
80
;
if
FStream.Write(lowPart,
1
) <>
1
then
Exit;
until
Num =
0
;
Result := true;
end
;
function
TBinarySerializer.WriteString
(
const
S: string): Boolean;
var
i: Integer;
id: integer;
u8: UTF8String;
begin
Result := false;
if
(Length(S) >
4
)
and
FStringTable.TryGetValue(S, id)
then
begin
if
not
WriteNumber(cardinal(id)
OR
$FF000000)
then
Exit;
end
else
begin
if
Length(S) >
4
then
begin
FStringTable.Add(S, FStringTable.Count);
if
FStringTable.Count > $FFFFFF
then
raise Exception.Create(
'
TBinarySerializer.WriteString: Too many strings!
'
);
end
;
u8 := UTF8Encode(s);
i := Length(u8);
if
not
WriteNumber(i)
then
Exit;
if
i >
0
then
if
FStream.Write(u8[
1
], i) <> i
then
Exit;
end
;
Result := true;
end
;
end
.
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