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uSymTab.pas
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uSymTab.pas
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{Copyright (c) 2008 Ville Krumlinde
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.}
unit uSymTab;
interface
uses Classes,Contnrs,ZLog, Generics.Collections;
type
{$ifndef fpc}
TSymTabFunc = reference to procedure(const S : string; Item : TObject; Context : pointer);
{$endif}
TSymbolTable = class
strict private type
TSymTabEntry = class
Name : string;
Value : TObject;
end;
TSymTabScope = TObjectDictionary<string,TSymTabEntry>;
strict private
Log : TLog;
Scopes : TObjectList<TSymTabScope>;
function CurrentScope : TSymTabScope;
//procedure DumpToLog(const Header : string);
public
constructor Create;
destructor Destroy; override;
procedure Add(const Name : string; Value : TObject);
procedure AddPrevious(const Name : string; Value : TObject; const StepsBack : integer = 1);
function ScopeContains(const Name: string): boolean;
function Contains(const Name : string) : boolean;
function Lookup(const Name : string) : TObject;
function MakeUnique(const Prefix : string) : string;
procedure Remove(const Name : string);
procedure ClearAll;
procedure PushScope;
procedure PopScope;
procedure DumpToLog;
{$ifndef fpc}
procedure Iterate(F : TSymTabFunc; Context : pointer = nil);
{$endif}
end;
implementation
uses SysUtils;
{ TSymbolTable }
constructor TSymbolTable.Create;
begin
Log := GetLog(Self.ClassName);
Scopes := TObjectList<TSymTabScope>.Create(True);
ClearAll;
end;
function TSymbolTable.CurrentScope: TSymTabScope;
begin
Result := Scopes[Scopes.Count-1];
end;
procedure TSymbolTable.PushScope;
var
List : TSymTabScope;
begin
List := TSymTabScope.Create([doOwnsValues]);
Scopes.Add(List);
end;
procedure TSymbolTable.PopScope;
begin
Scopes.Delete(Scopes.Count-1);
end;
procedure TSymbolTable.Add(const Name: string; Value: TObject);
var
Entry : TSymTabEntry;
Key : string;
begin
Key := LowerCase(Name);
Entry := TSymTabEntry.Create;
Entry.Name := Name;
Entry.Value := Value;
CurrentScope.Add(Key,Entry);
end;
procedure TSymbolTable.AddPrevious(const Name: string; Value: TObject; const StepsBack : integer = 1);
//Add to previous (global scope)
var
Entry : TSymTabEntry;
Key : string;
begin
Key := LowerCase(Name);
Entry := TSymTabEntry.Create;
Entry.Name := Name;
Entry.Value := Value;
Scopes[Scopes.Count-1 - StepsBack].Add(Key,Entry);
end;
procedure TSymbolTable.ClearAll;
begin
Scopes.Clear;
PushScope;
end;
function TSymbolTable.Contains(const Name: string): boolean;
var
I : integer;
List : TSymTabScope;
Key : string;
begin
Result := False;
Key := LowerCase(Name);
for I := Scopes.Count-1 downto 0 do
begin
List := Scopes[I];
Result := List.ContainsKey(Key);
if Result then
Break;
end;
end;
function TSymbolTable.ScopeContains(const Name: string): boolean;
var
Key : string;
begin
Key := LowerCase(Name);
Result := CurrentScope.ContainsKey(Key);
end;
destructor TSymbolTable.Destroy;
begin
Scopes.Free;
inherited;
end;
function TSymbolTable.Lookup(const Name: string): TObject;
var
I : integer;
List : TSymTabScope;
Key : string;
Entry : TSymTabEntry;
begin
Key := LowerCase(Name);
Result := nil;
for I := Scopes.Count-1 downto 0 do
begin
List := Scopes[I];
if List.TryGetValue(Key,Entry) then
begin
Result := Entry.Value;
Break;
end;
end;
end;
function TSymbolTable.MakeUnique(const Prefix: string): string;
var
I : integer;
begin
I := 0;
repeat
Inc(I);
Result := Prefix + IntToStr(I);
until not Contains(Result);
end;
procedure TSymbolTable.Remove(const Name: string);
var
Key : string;
begin
Key := LowerCase(Name);
CurrentScope.Remove(Key);
end;
procedure TSymbolTable.DumpToLog;
var
I : integer;
List : TSymTabScope;
Entry : TSymTabEntry;
begin
Log.Write('Scopes: ' + IntToStr(Scopes.Count));
for I := Scopes.Count-1 downto 0 do
begin
List := Scopes[I];
for Entry in List.Values do
Log.Write(Entry.Name + ' ' + Entry.Value.ClassName);
end;
end;
{$ifndef fpc}
procedure TSymbolTable.Iterate(F: TSymTabFunc; Context: pointer);
var
I : integer;
List : TSymTabScope;
Entry : TSymTabEntry;
begin
for I := Scopes.Count-1 downto 0 do
begin
List := Scopes[I];
for Entry in List.Values do
F(Entry.Name,Entry.Value,Context);
end;
end;
{$endif}
end.