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GS.Language.Tokenizer.Twee.pas
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GS.Language.Tokenizer.Twee.pas
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unit GS.Language.Tokenizer.Twee;
{$IFDEF FPC}
{$mode delphi}{$H+}
{$ENDIF FPC}
interface
uses
Classes, SysUtils, ContNrs,
GS.Language.WordTokenizer,
GS.Language.Compiler;
type
//Main symbol type.
TTweeTokenType = ( tttword,tttsymbol,tttnumber,tttLF, tttCR,
tttnumberInt, tttnumberFloat, tttstring,
tttPassageMark, tttGlobalVariable, tttLocalVariable
);
TTweeTokenItem = class
public
TweeTokType : TTweeTokenType;
TokenSource : TTokenItem;
ItemStringValue : String;
Constructor Create(_tokType : TTweeTokenType; tokSource : TTokenItem); reintroduce;
end;
TTweeTokenList = class(TObjectList)
protected
FSave : TStack;
FIndex : Integer;
function GetTweeTokenItem(Index: Uint32): TTweeTokenItem;
function GetTweeTokenCount: Uint32;
public
function AddToken(_tokType : TTweeTokenType; tokSource : TTokenItem) : TTweeTokenItem;
property TweeTokenCount : Uint32 read GetTweeTokenCount;
property TweeTokens[Index : Uint32] : TTweeTokenItem read GetTweeTokenItem;
constructor Create; virtual;
destructor Destroy; override;
procedure Push;
function Pop : TTweeTokenItem;
function IsLast : boolean;
function First : TTweeTokenItem;
function Current : TTweeTokenItem;
function Next : TTweeTokenItem;
function Previous : TTweeTokenItem;
function getDataBetween(start,finish : string) : string;
function IsNextTokenSequenceConformTo(Test : Array of TTweeTokenType) : boolean;
function IsNextItemSequenceConformTo(Test : Array of String) : boolean;
function NextSequenceToString(number : UInt32) : string;
property TokenPos : Int32 read FIndex;
end;
TTweeTokenizer = Class(TWordTokenizer)
Type TTokenizeState = (normal, betweenbracket);
private
ftweeItems: TTweeTokenList;
falreadyAdded : boolean;
finternalState : TTokenizeState;
function GetTweeTokenItem(index: integer): TTweeTokenItem;
function GetTweeTokenCount: Uint32;
protected
//state
procedure internal_common_getnumber;
procedure InternalTokenize_Normal;
procedure internal_normal_symbol;
procedure InternalTokenize_Bracket;
//tools
procedure addTweeTokenFromStdTokenCurrent;
procedure addTweeTokenWithTokenCurrent(_tweetokType : TTweeTokenType; const ItemStr : string = '');
public
constructor Create; override;
destructor Destroy; override;
procedure Tokenize(const _source : String); override;
property TweeTokenCount : Uint32 read GetTweeTokenCount;
property TweeTokens[index : integer] : TTweeTokenItem read GetTweeTokenItem;
property TT : TTweeTokenList read ftweeItems;
End;
implementation
procedure SetTweeKeySymbols(var _symbols: DyArrayOfChar);
begin
_symbols := DyArrayOfChar.Create(' ',';',':','=','+','-','*','[',']','\','/','{','}',',','(',')','"','.',',','''',#13,#10);
end;
{ TTweeTokenizer }
procedure TTweeTokenizer.addTweeTokenFromStdTokenCurrent;
{$IFDEF DEBUG} var l : TTokenItem;{$ENDIF}
begin
if not(falreadyAdded) then
begin
//4 first states is same. (see TokenType vs TweeTokenType)
assert(Ord(_Current.TokType)<5);
ftweeItems.AddToken(TTweeTokenType(_Current.TokType),_current);
{$IFDEF DEBUG} l := _Current;{$ENDIF}
falreadyAdded := true;
end;
end;
procedure TTweeTokenizer.addTweeTokenWithTokenCurrent(_tweetokType : TTweeTokenType; const ItemStr : string = '');
var l : TTweeTokenItem;
begin
if not(falreadyAdded) then
begin
l := ftweeItems.AddToken(_tweetokType,_current);
falreadyAdded := true;
if ItemStr<>'' then
l.ItemStringValue := ItemStr;
end;
end;
constructor TTweeTokenizer.Create;
begin
inherited;
SetTweeKeySymbols(KeySymbols);
ftweeItems := TTweeTokenList.Create;
end;
destructor TTweeTokenizer.Destroy;
begin
FreeAndNil(ftweeItems);
inherited;
end;
function TTweeTokenizer.GetTweeTokenCount: Uint32;
begin
result := ftweeItems.count;
end;
function TTweeTokenizer.GetTweeTokenItem(index: integer): TTweeTokenItem;
begin
result := ftweeItems.TweeTokens[index];
end;
///------------------------------------------------------------------------
///------------------------------------------------------------------------
///------------------------------------------------------------------------
///------------------------------------------------------------------------
///------------------------------------------------------------------------
///------------------------------------------------------------------------
procedure TTweeTokenizer.InternalTokenize_Bracket;
begin
case _Current.TokType of
ttsymbol :
begin
if _current.item = '}' then
begin
finternalState := TTokenizeState.normal;
end
end;
ttnumber :
begin
internal_common_getnumber;
end;
end;
end;
procedure TTweeTokenizer.InternalTokenize_Normal;
begin
case _Current.TokType of
ttsymbol :
begin
internal_normal_symbol;
end;
ttnumber :
begin
internal_common_getnumber;
end;
end;
end;
procedure TTweeTokenizer.internal_common_getnumber;
var l : string;
procedure getNum;
begin
while not(_IsLast) and (_Current.IsNumber) do
begin
l := l + _Current.item;
_next;
end;
end;
begin
l := '';
//Real part
getNum;
if not(_IsLast) and (_Current.item = '.') then
begin
l := l + '.';
_next;
//Mantissa.
getNum;
_Previous;
addTweeTokenWithTokenCurrent(TTweeTokenType.tttnumberFloat,l);
end
else
begin
_Previous;
addTweeTokenWithTokenCurrent(TTweeTokenType.tttnumberInt,l);
end;
end;
procedure TTweeTokenizer.internal_normal_symbol;
begin
if _current.item = '{' then
begin
finternalState := TTokenizeState.betweenbracket;
end;
end;
procedure TTweeTokenizer.Tokenize(const _source: String);
begin
inherited Tokenize(_source);
finternalState := TTokenizeState.normal;
_First;
while Not(_IsLast) do
begin
falreadyAdded := false; //addTweeTokenFromStdTokenCurrent add a std only if false; (only one token by loop)
case finternalState of
normal: InternalTokenize_Normal;
betweenbracket: InternalTokenize_Bracket;
end;
addTweeTokenFromStdTokenCurrent;
_next;
end;
end;
{ TTweeTokenItem }
constructor TTweeTokenItem.Create(_tokType: TTweeTokenType;
tokSource: TTokenItem);
begin
inherited Create;
assert(assigned(tokSource));
TweeTokType := _tokType;
TokenSource := TokSource;
ItemStringValue := tokSource.item;
end;
{ TTweeTokenList }
function TTweeTokenList.AddToken(_tokType: TTweeTokenType; tokSource: TTokenItem) : TTweeTokenItem;
begin
result := TTweeTokenItem.Create(_tokType,tokSource);
Add(result);
end;
function TTweeTokenList.GetTweeTokenItem(Index: Uint32): TTweeTokenItem;
begin
result := TTweeTokenItem(Items[Index]);
end;
function TTweeTokenList.GetTweeTokenCount: Uint32;
begin
result:= Count;
end;
constructor TTweeTokenList.Create;
begin
inherited Create(true);
FSave := TStack.Create;
FIndex := -1;
end;
function TTweeTokenList.Current: TTweeTokenItem;
begin
result := tweetokens[FIndex];
end;
destructor TTweeTokenList.Destroy;
begin
FreeAndNil(FSave);
inherited;
end;
function TTweeTokenList.IsLast: boolean;
begin
Result := FIndex = Count-1;
end;
function TTweeTokenList.IsNextItemSequenceConformTo(
Test: array of String): boolean;
var i,j : integer;
begin
result := false;
if length(test)=0 then
Exit;
j := 0;
if FIndex + length(Test) < Count then
begin
for i := Findex to (FIndex + length(Test)-1) do
begin
result := (TTweeTokenItem(Items[i]).ItemStringValue) = test[j];
if not result then
break;
inc(j);
end;
end;
end;
function TTweeTokenList.IsNextTokenSequenceConformTo(
Test: array of TTweeTokenType): boolean;
var i,j : integer;
begin
result := false;
if length(test)=0 then
Exit;
j := 0;
if FIndex + length(Test) < Count then
begin
for i := Findex to (FIndex + length(Test)-1) do
begin
result := TTweeTokenItem(Items[i]).TweeTokType = test[j];
if not result then
break;
inc(j);
end;
end;
end;
function TTweeTokenList.First: TTweeTokenItem;
begin
FIndex := -1;
result := Next;
end;
function TTweeTokenList.getDataBetween(start, finish: string): string;
begin
result := '';
if (Current.ItemStringValue = start) or (start = '') then
begin
Next;
while Not(IsLast) And (Current.ItemStringValue <> finish) do
begin
result := result + Current.ItemStringValue;
Next;
end;
end;
end;
function TTweeTokenList.Next: TTweeTokenItem;
begin
Assert(Findex<Count);
result := nil;
inc(FIndex);
While (FIndex<Count-1) and (
(TTweeTokenItem(Items[FIndex]).TweeTokType = TTweeTokenType.tttLF) or
(TTweeTokenItem(Items[FIndex]).TweeTokType = TTweeTokenType.tttCR) or
(TTweeTokenItem(Items[FIndex]).ItemStringValue = ' ')) do
inc(FIndex);
if FIndex<Count then
result := TweeTokens[FIndex];
end;
function TTweeTokenList.NextSequenceToString(number: UInt32): string;
var i : integer;
begin
result := '';
if FIndex + number < Count then
begin
for i := Findex to (FIndex + number-1) do
begin
result := result + TTweeTokenItem(Items[i]).ItemStringValue;
end;
end;
end;
function TTweeTokenList.Pop : TTweeTokenItem;
begin
result := TTweeTokenItem(FSave.Pop);
FIndex := IndexOf(result);
end;
function TTweeTokenList.Previous: TTweeTokenItem;
begin
Assert(Findex>0);
dec(FIndex);
While (FIndex>0) and
(TTweeTokenItem(Items[FIndex]).TweeTokType = TTweeTokenType.tttLF) or
(TTweeTokenItem(Items[FIndex]).TweeTokType = TTweeTokenType.tttCR) or
(TTweeTokenItem(Items[FIndex]).ItemStringValue = ' ') do
Dec(FIndex);
result := TweeTokens[FIndex];
end;
procedure TTweeTokenList.Push;
begin
Assert(Findex>-1);
FSave.Push(TweeTokens[FIndex]);
end;
end.