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environment.pas
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environment.pas
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{
Crafting Interpreters
https://craftinginterpreters.com/
}
unit environment;
{$ifdef FPC}
{$mode delphi}
{$endif}
{$DEFINE ENVIR_BENCH}
interface
// TO DO Check black hole
uses
Classes, SysUtils, Generics.Collections
, token;
type
{ TEnvironment }
TEnvironment = class
private
FEnclosing: TEnvironment;
//FValues: TObjectDictionary<string, TObject>;
FValues: TDictionary<string, Pointer>;
public
constructor Create; // overload;
// constructor Create(encl: TEnvironment); overload;
destructor Destroy; override;
function Get(tok: TToken): TObject;
procedure Assign(tok: TToken; val: TObject);
procedure Define(vname: string; val: TObject);
procedure Finalize;
property enclosing: TEnvironment read FEnclosing write FEnclosing;
end;
implementation
uses ptypes, rterror;
var
blackHole: TObject;
{$IFDEF ENVIR_BENCH}
getTicks, assignTicks, defineTicks: QWord;
{$ENDIF}
constructor TEnvironment.Create;
begin
self.FEnclosing := nil;
//FValues := TObjectDictionary<string, TObject>.Create([doOwnsValues]);
FValues := Generics.Collections.TDictionary<string, Pointer>.Create();
end;
{
constructor TEnvironment.Create(encl: TEnvironment);
begin
self.FEnclosing := encl;
FValues := TObjectDictionary<string, TObject>.Create([doOwnsValues]);
end;
}
destructor TEnvironment.Destroy;
var
key: String;
begin
FreeAndNil(self.FValues);
inherited Destroy;
end;
function TEnvironment.Get(tok: TToken): TObject;
var
val: Pointer;
obj: TObject;
{$IFDEF ENVIR_BENCH}
delta: QWord;
{$ENDIF}
begin
if FValues.TryGetValue(tok.lexeme, val) then
begin
{$IFDEF ENVIR_BENCH}
delta := GetTickCount64();
{$ENDIF}
obj := TObject(val);
if obj is TLoxObject then
obj := TLoxObject(obj).Clone;
{$IFDEF ENVIR_BENCH}
Inc(getTicks, GetTickCount64() - delta);
{$ENDIF}
Exit(obj);
end;
if self.FEnclosing <> nil then
Exit(self.FEnclosing.Get(tok));
raise ERuntimeError.Create(tok, Format('Undefined variable ''%s''.', [tok.lexeme]));
end;
procedure TEnvironment.Assign(tok: TToken; val: TObject);
var
v: Pointer;
//obj: TObject;
{$IFDEF ENVIR_BENCH}
delta: QWord;
{$ENDIF}
begin
if FValues.TryGetValue(tok.lexeme, v) then
begin
{$IFDEF ENVIR_BENCH}
delta := GetTickCount64();
{$ENDIF}
if val is TLoxObject then
val := TLoxObject(val).Clone;
FValues.Items[tok.lexeme] := Pointer(val);
{$IFDEF ENVIR_BENCH}
Inc(assignTicks, GetTickCount64() - delta);
{$ENDIF}
Exit;
end;
if self.FEnclosing <> nil then
begin
self.FEnclosing.Assign(tok, val);
Exit;
end;
raise ERuntimeError.Create(tok, Format('Undefined variable ''%s''.', [tok.lexeme]));
end;
procedure TEnvironment.Define(vname: string; val: TObject);
{$IFDEF ENVIR_BENCH}
var
delta: QWord;
{$ENDIF}
// pair: TPair<string, TObject>;
begin
{$IFDEF ENVIR_BENCH}
delta := GetTickCount64();
{$ENDIF}
if val is TLoxObject then
val := TLoxObject(val).Clone;
FValues.AddOrSetValue(vname, Pointer(val));
{$IFDEF ENVIR_BENCH}
Inc(defineTicks, GetTickCount64() - delta);
{$ENDIF}
end;
procedure TEnvironment.Finalize;
var
key: String;
begin
{
for key in self.FValues.keys do
self.FValues[key] := blackHole;
}
end;
initialization
blackHole := TObject.Create;
{$IFDEF ENVIR_BENCH}
getTicks := 0;
assignTicks := 0;
defineTicks := 0;
{$ENDIF}
finalization
FreeAndNil(blackHole);
{$IFDEF ENVIR_BENCH}
WriteLn('TEnvironment - getTicks: ', getTicks);
WriteLn('TEnvironment - assignTicks: ', assignTicks);
WriteLn('TEnvironment - defineTicks: ', defineTicks);
{$ENDIF}
end.