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GS.Language.WordTokenizer.pas
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GS.Language.WordTokenizer.pas
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unit GS.Language.WordTokenizer;
{$IFDEF FPC}
{$mode delphi}{$H+}
{$ENDIF FPC}
interface
uses
Classes,
SysUtils,
contnrs,
Generics.Collections;
type
DyArrayOfChar = array of char;
TTokenType = (ttword,ttsymbol,ttnumber,ttLF, ttCR);
{ TTokenItem }
TTokenItem = class
private
FCol: integer;
FItem: string;
FLine: integer;
FType: TTokenType;
function getIsSymbol: boolean;
function getIsEndLineChars: boolean;
function getIsNumber: boolean;
function getIsWord: boolean;
public
constructor create(_tokType : TTokenType; _item : String; _line : integer; _col : integer); virtual;
procedure ChangeValueRequest(_newItem : string);
property TokType : TTokenType read FType;
property item : string read FItem;
property line : integer read FLine;
property col : integer read FCol;
property IsSymbol : boolean read getIsSymbol;
property IsWord : boolean read getIsWord;
property IsNumber : boolean read getIsNumber;
property IsEndLineChars : boolean read getIsEndLineChars;
end;
TTokenItemArray = Array of TTokenItem;
{ TWordTokenizer }
TWordTokenizerList = class(TObjectList)
private
function GetTokenItem(index: integer): TTokenItem;
protected
FSave : TStack;
FIndex : Integer;
public
constructor Create; virtual;
destructor Destroy; override;
procedure Push;
procedure Pop;
function IsLast : boolean;
function First : TTokenItem;
function Current : TTokenItem;
function Next : TTokenItem;
function Previous : TTokenItem;
function IsNextTokenSequenceConformTo(Test : Array of TTokenType) : boolean;
function IsNextItemSequenceConformTo(Test : Array of String) : boolean;
function getAsTokenItemArray : TTokenItemArray;
property Tokens[index : integer] : TTokenItem read GetTokenItem;
property TokenPos : Int32 read FIndex;
end;
TWordTokenizer = class
private
function GetTokenCount: integer;
function GetTokenItem(index : integer): TTokenItem;
protected
FItem : TWordTokenizerList;
public
code : TStringList;
KeySymbols : DyArrayOfChar;
constructor Create; virtual;
destructor Destroy; override;
procedure Tokenize(const _source : String); virtual;
function getAsTokenItemArray : TTokenItemArray;
function IsNextTokenSequenceConformTo(Test : Array of TTokenType) : boolean;
function IsNextItemSequenceConformTo(Test : Array of String) : boolean;
procedure _Push;
procedure _Pop;
function _IsLast : boolean;
function _First : TTokenItem;
function _Current : TTokenItem;
function _Next : TTokenItem;
function _Previous : TTokenItem;
property tokens[index : integer] : TTokenItem read GetTokenItem;
property tokenCount : integer read GetTokenCount;
end;
procedure SetStandartKeySymbols(var _symbols : DyArrayOfChar);
implementation
procedure SetStandartKeySymbols(var _symbols: DyArrayOfChar);
begin
_symbols := DyArrayOfChar.Create(' ','=','+','-','*','/','%','&','{','}',',','(',')','"','.',#13,#10);
end;
{ TTokenItem }
procedure TTokenItem.ChangeValueRequest(_newItem: string);
begin
FItem := _newItem;
end;
constructor TTokenItem.create(_tokType: TTokenType; _item: String;
_line: integer; _col: integer);
begin
inherited create;
assert(Length(_item)>0);
FType:= _tokType;
FItem:= _item;
FLine:= _line;
FCol:= _col;
end;
function TTokenItem.getIsEndLineChars: boolean;
begin
result := (tokType = TTokenType.ttLF) or (tokType = TTokenType.ttCR);
end;
function TTokenItem.getIsNumber: boolean;
begin
result := TokType = TTokenType.ttnumber;
end;
function TTokenItem.getIsSymbol: boolean;
begin
result := TokType = TTokenType.ttsymbol;
end;
function TTokenItem.getIsWord: boolean;
begin
result := TokType = TTokenType.ttword;
end;
{ TWordTokenizer }
function TWordTokenizer.GetTokenCount: integer;
begin
result := FItem.Count;
end;
function TWordTokenizer.GetTokenItem(index : integer): TTokenItem;
begin
result := TTokenItem(FItem[index]);
end;
function TWordTokenizer.IsNextItemSequenceConformTo(
Test: array of String): boolean;
begin
result := FItem.IsNextItemSequenceConformTo(Test);
end;
function TWordTokenizer.IsNextTokenSequenceConformTo(
Test: array of TTokenType): boolean;
begin
result := FItem.IsNextTokenSequenceConformTo(Test);
end;
constructor TWordTokenizer.create;
begin
FItem:= TWordTokenizerList.Create;
code := TStringList.Create;
SetStandartKeySymbols(KeySymbols);
end;
destructor TWordTokenizer.Destroy;
begin
FreeAndNil(FItem);
FreeAndNil(code);
end;
function TWordTokenizer.getAsTokenItemArray: TTokenItemArray;
begin
result := FItem.getAsTokenItemArray;
end;
procedure TWordTokenizer.Tokenize(const _source: String);
function isKeySymbols(t : char) : boolean;
var i : integer;
begin
result := false;
for i := low(KeySymbols) to high(KeySymbols) do
begin
if t = KeySymbols[i] then
begin
result := true;
break;
end;
end;
end;
var lcode, _word : String;
i : integer;
ln,lc : integer;
procedure wordProcess;
var t : TTokenType;
begin
if length(_word)>0 then
begin
t := TTokenType.ttword;
if (StrToInt64Def(_word,-1)<>-1) then
t := TTokenType.ttnumber;
FItem.add(TTokenItem.Create(t,_word,ln,lc));
_word:= '';
end;
end;
procedure keySymbolProcess;
begin
if isKeySymbols(lcode[i]) then
begin
wordProcess;
if lcode[i] = #13 then
begin
FItem.add(TTokenItem.Create(TTokenType.ttLF,lcode[i],ln,lc));
inc(ln);
lc := 1;
end
else
if lcode[i] = #10 then
begin
FItem.add(TTokenItem.Create(TTokenType.ttCR,lcode[i],ln,lc));
end
else
begin
FItem.add(TTokenItem.Create(TTokenType.ttsymbol,lcode[i],ln,lc));
inc(lc);
end;
end
else
begin
_word:= _word + lcode[i];
inc(lc);
end;
end;
begin
code.Text := _source;
lcode := _source; //via stringlist, perf down. (need stringlist later.)
_word := '';
lc := 0;
ln := 0;
for i:= 1 to length(lcode) do
begin
keySymbolProcess;
end;
wordProcess;
end;
function TWordTokenizer._Current: TTokenItem;
begin
result := FItem.Current;
end;
function TWordTokenizer._First: TTokenItem;
begin
result := FItem.First;
end;
function TWordTokenizer._IsLast: boolean;
begin
result := FItem.IsLast;
end;
function TWordTokenizer._Next: TTokenItem;
begin
result := FItem.Next;
end;
procedure TWordTokenizer._Pop;
begin
FItem.Pop;
end;
function TWordTokenizer._Previous: TTokenItem;
begin
result := FItem.Previous;
end;
procedure TWordTokenizer._Push;
begin
FItem.Push;
end;
{ TWordTokenizerList }
constructor TWordTokenizerList.Create;
begin
inherited Create(true);
FSave := TStack.Create;
FIndex := -1;
end;
function TWordTokenizerList.Current: TTokenItem;
begin
result := tokens[FIndex];
end;
destructor TWordTokenizerList.Destroy;
begin
FreeAndNil(FSave);
inherited;
end;
function TWordTokenizerList.getAsTokenItemArray: TTokenItemArray;
var i : integer;
begin
SetLength(result,Count);
for i := 0 to Count-1 do
begin
Result[i] := TTokenItem(Items[i]);
end;
end;
function TWordTokenizerList.GetTokenItem(index: integer): TTokenItem;
begin
result := TTokenItem(Items[index]);
end;
function TWordTokenizerList.IsLast: boolean;
begin
Result := FIndex = Count-1;
end;
function TWordTokenizerList.IsNextItemSequenceConformTo(
Test: array of String): boolean;
var i,j : integer;
l : integer;
begin
result := false;
l := FIndex;
j := 0;
if FIndex + length(Test) < Count then
begin
for i := Findex to (FIndex + length(Test)) do
begin
result := TTokenItem(Items[i]).item = test[j];
if not result then
break;
inc(j);
end;
end;
end;
function TWordTokenizerList.IsNextTokenSequenceConformTo(
Test: array of TTokenType): boolean;
var i,j : integer;
l : integer;
begin
result := false;
l := FIndex;
j := 0;
if FIndex + length(Test) < Count then
begin
for i := Findex to (FIndex + length(Test)) do
begin
result := TTokenItem(Items[i]).TokType = test[j];
if not result then
break;
inc(j);
end;
end;
end;
function TWordTokenizerList.First: TTokenItem;
begin
FIndex := -1;
result := Next;
end;
function TWordTokenizerList.Next: TTokenItem;
begin
Assert(Findex<Count);
result := nil;
inc(FIndex);
While (FIndex<Count-1) and (
(TTokenItem(Items[FIndex]).TokType = TTokenType.ttLF) or
(TTokenItem(Items[FIndex]).TokType = TTokenType.ttCR) or
(TTokenItem(Items[FIndex]).item = ' ')) do
inc(FIndex);
if FIndex<Count then
result := Tokens[FIndex];
end;
procedure TWordTokenizerList.Pop;
var l : TTokenItem;
begin
l := TTokenItem(FSave.Pop);
FIndex := IndexOf(l);
end;
function TWordTokenizerList.Previous: TTokenItem;
begin
Assert(Findex>0);
dec(FIndex);
While (FIndex>0) and
(TTokenItem(Items[FIndex]).TokType = TTokenType.ttLF) or
(TTokenItem(Items[FIndex]).TokType = TTokenType.ttCR) or
(TTokenItem(Items[FIndex]).item = ' ') do
Dec(FIndex);
result := Tokens[FIndex];
end;
procedure TWordTokenizerList.Push;
begin
Assert(Findex>-1);
FSave.Push(tokens[FIndex]);
end;
end.