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XSuperJSON.pas
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XSuperJSON.pas
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(*
* Cross Super Object Toolkit
*
* Usage allowed under the restrictions of the Lesser GNU General Public License
* or alternatively the restrictions of the Mozilla Public License 1.1
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* Embarcadero Technologies Inc is not permitted to use or redistribute
* this source code without explicit permission.
*
* Unit owner : Onur YILDIZ <onryldz10@gmail.com>
* Web site : http://www.caracaldev.org
*
*)
unit XSuperJSON;
interface
uses
SysUtils, Classes, Generics.Collections, Generics.Defaults, Math, DateUtils, RegularExpressions, RTTI;
const
CNull = 'null';
MaxCHR = #127;
Err_UnexpectedEndOfInput = 'Unexpected end of input';
Err_Expected = 'Expected %s';
Err_ExpectedButFound = '"%s" expected but "%s" found';
Err_UnexpectedTokenILLEGAL = 'Unexpected token ILLEGAL';
type
// ## Forward Declarations
// -----------------------
TJSONNull = class;
TLexGenerator = class;
TRoute = class;
TPosition = record
Col: Integer;
Line: Integer;
end;
TDataType = (dtNil, dtNull, dtObject, dtArray, dtString, dtInteger, dtFloat, dtBoolean, dtDateTime, dtDate, dtTime);
TJSONComparison<T> = reference to function(Left, Right: T): Integer;
// ## Exception
TJSONSyntaxError = class(Exception)
public
constructor Create(const Msg: String; Pos: TPosition);
constructor CreateFmt(const Msg: String; const Args: array of TVarRec; Pos: TPosition);
end;
// ## JSONWriter
TJSONWriter = class
public const
IDENT_SIZE = 2;
private
FData: TStringBuilder;
FIdent: Boolean;
FIdentOffset: Integer;
FUniversalTime: Boolean;
public
constructor Create(const useIdent, useUniversalTime: Boolean);
destructor Destroy; override;
procedure Inc;
procedure Dec;
function Append(const Value: string; const CRLF: Boolean = False): TJSONWriter; overload;
function Append(const Value: int64; const CRLF: Boolean = False): TJSONWriter; overload;
function AppendVal(const Value: string; const CRLF: Boolean = False): TJSONWriter; overload;
function AppendVal(const Value: int64; const CRLF: Boolean = False): TJSONWriter; overload;
function ToString: string; override;
property Ident: Boolean read FIdent;
property UniversalTime: Boolean read FUniversalTime;
end;
// ## JSON Symbols
// ---------------
IJSONAncestor = interface
['{FFB71762-50A1-4D27-9F59-56F6208421C7}']
function GetAsVariant: Variant;
procedure SetAsVariant(const Value: Variant);
function GetDataType: TDataType;
function GetIsNull: Boolean;
procedure AsJSONString(Str: TJSONWriter);
property IsNull: Boolean read GetIsNull;
property DataType: TDataType read GetDataType;
property AsVariant: Variant read GetAsVariant write SetAsVariant;
end;
TJSONAncestor = class abstract(TInterfacedObject, IJSONAncestor)
private
function GetAsVariant: Variant;
procedure SetAsVariant(const Value: Variant);
protected
function GetDataType: TDataType; virtual;
function GetIsNull: Boolean; virtual;
public
procedure AsJSONString(Str: TJSONWriter); virtual;
property IsNull: Boolean read GetIsNull;
property DataType: TDataType read GetDataType;
property AsVariant: Variant read GetAsVariant write SetAsVariant;
end;
IJSONValue<T> = interface(IJSONAncestor)
['{0B1ED53C-EF62-4BFA-9E78-9DD9088D96C5}']
function GetData: T;
procedure SetData(const Value: T);
procedure SetNull;
property Value: T read GetData write SetData;
end;
TJSONValue<T> = class abstract(TJSONAncestor, IJSONValue<T>)
public
FNull: Boolean;
FData: T;
protected
function GetData: T; virtual;
procedure SetData(const Value: T); virtual;
function GetIsNull: Boolean; override;
property Value: T read GetData write SetData;
public
constructor Create(const Value: T);
constructor CreateNull;
procedure SetNull;
end;
IJSONNull = interface(IJSONValue<Boolean>)['{C19F5715-B832-46D8-8668-1A9DC31393D7}']end;
TJSONNull = class(TJSONValue<Boolean>, IJSONNull)
public
procedure AsJSONString(Str: TJSONWriter); override;
protected
function GetIsNull: Boolean; override;
end;
IJSONBoolean = interface(IJSONValue<Boolean>)['{CCC8D8C5-081D-4DCF-93DB-CC0696458A12}']end;
TJSONBoolean = class(TJSONValue<Boolean>, IJSONBoolean)
public
procedure AsJSONString(Str: TJSONWriter); override;
property Value;
end;
IJSONString = interface(IJSONValue<String>)['{C507BB41-3674-4F47-8D6B-5605258F6A2F}']end;
TJSONString = class(TJSONValue<String>, IJSONString)
public
procedure AsJSONString(Str: TJSONWriter); override;
property Value;
end;
IJSONInteger = interface(IJSONValue<Int64>)['{E9D84348-9634-40F5-8A1F-FF006F45FC6D}']end;
TJSONInteger = class(TJSONValue<Int64>, IJSONInteger)
public
procedure AsJSONString(Str: TJSONWriter); override;
property Value;
end;
IJSONFloat = interface(IJSONValue<Double>)['{29D840FB-191B-4304-9518-C2937B3AE6B0}']end;
TJSONFloat = class(TJSONValue<Double>, IJSONFloat)
public
procedure AsJSONString(Str: TJSONWriter); override;
property Value;
end;
IJSONBaseDate<T> = interface(IJSONValue<T>)
['{7ACB3D47-A9A6-49C1-AFF3-F451368EAE48}']
function GetAsString: String;
property AsString: String read GetAsString;
end;
TJSONBaseDate<T> = class(TJSONValue<T>, IJSONBaseDate<T>)
protected
FFormat: String;
public
function GetAsString: String;
procedure AsJSONString(Str: TJSONWriter); override;
end;
IJSONDateTime = interface(IJSONBaseDate<TDateTime>)['{9441CA2E-B822-4C13-ABF0-15F8026CCE50}']end;
TJSONDateTime = class(TJSONBaseDate<TDateTime>, IJSONDateTime)
public
constructor Create(const Value: TDateTime; const Format: String = 'yyyy-mm-dd"T"hh":"mm":"ss.zzz');
property Value;
end;
IJSONDate = interface(IJSONBaseDate<TDate>)['{A862D6A5-2C4A-41CD-B2C0-F7B58FA14066}']end;
TJSONDate = class(TJSONBaseDate<TDate>, IJSONDate)
public
constructor Create(const Value: TDate; const Format: String = 'yyyy-mm-dd');
property Value;
end;
IJSONTime = interface(IJSONBaseDate<TTime>)['{EEBCD145-B837-4129-A21D-378DF7DA53B2}']end;
TJSONTime = class(TJSONBaseDate<TTime>, IJSONTime)
public
constructor Create(const Value: TTime; const Format: String = 'hh":"mm":"ss.zzz');
property Value;
end;
TJSONDateTimeCheckCallBack = reference to function(Str: String; var Value: TDateTime; var Typ: TDataType): Boolean;
TJSONDateManager = class
private
class var FFormats: TList<TJSONDateTimeCheckCallBack>;
class function GetFormats: TList<TJSONDateTimeCheckCallBack>; static; inline;
public
class constructor Create;
class destructor Destroy;
class function Check(const Data: String; var AValue: TDateTime; var Typ: TDataType): Boolean;
class property Formats: TList<TJSONDateTimeCheckCallBack> read GetFormats;
end;
IJSONPair = interface
['{D328943F-5ED1-4B35-8332-573156565C96}']
function GetName: String;
function GetValue: IJSONAncestor;
procedure SetName(const Value: String);
procedure SetValue(const Value: IJSONAncestor);
property Name: String read GetName write SetName;
property JSONValue: IJSONAncestor read GetValue write SetValue;
end;
TJSONPair = class(TInterfacedObject, IJSONPair)
private
FName: String;
FValue: IJSONAncestor;
function GetName: String;
function GetValue: IJSONAncestor;
procedure SetName(const Value: String);
procedure SetValue(const Value: IJSONAncestor);
public
constructor Create(const aName: String; aValue: IJSONAncestor);
destructor Destroy; override;
property Name: String read GetName write SetName;
property JSONValue: IJSONAncestor read GetValue write SetValue;
end;
TJSONEnumerator<T> = record
Index : Integer;
List : TList<T>;
function MoveNext : Boolean;
function GetCurrent : T;
property Current : T read GetCurrent;
end;
IJSONObject = Interface(IJSONValue<IJSONPair>)
['{2A9244EC-F202-4CC1-9F89-7DA12437F7ED}']
function Count: Integer;
function Get(const Name: String): IJSONPair; overload;
function Get(const Index: Integer): IJSONPair; overload;
procedure AddPair(P: IJSONPair); overload;
procedure AddPair(Name: String; Value: IJSONAncestor); overload;
procedure Remove(P: IJSONPair); overload;
procedure Remove(const Name: String); overload;
procedure Remove(const Index: Integer); overload;
function GetEnumerator: TJSONEnumerator<IJSONPair>;
procedure Sort(Comparison: TJSONComparison<IJSONPair>);
end;
TJSONObject = class(TJSONValue<IJSONPair>, IJSONObject)
private
FPairList: TList<IJSONPair>;
FNull: Boolean;
protected
function GetIsNull: Boolean; override;
public
constructor Create;
destructor Destroy; override;
function Count: Integer;
function Get(const Name: String): IJSONPair; overload;
function Get(const Index: Integer): IJSONPair; overload;
procedure AsJSONString(Str: TJSONWriter); override;
procedure AddPair(P: IJSONPair); overload;
procedure AddPair(Name: String; Value: IJSONAncestor); overload; inline;
procedure Remove(P: IJSONPair); overload; inline;
procedure Remove(const Name: String); overload;
procedure Remove(const Index: Integer); overload;
function GetEnumerator: TJSONEnumerator<IJSONPair>;
procedure Sort(Comparison: TJSONComparison<IJSONPair>);
class function ParseJSONValue(const Str: String; const CheckDate: Boolean): IJSONAncestor;
end;
IJSONArray = interface(IJSONValue<IJSONAncestor>)
['{C63B4323-6D7E-4151-BA1B-4C55CDE28FDB}']
procedure Add(Val: IJSONAncestor);
procedure Remove(Val: IJSONAncestor); overload;
procedure Remove(Index: Integer); overload;
procedure Clear;
function Count: Integer;
function Get(const I: Integer): IJSONAncestor;
procedure SetIndex(const Int: Integer; const Value: IJSONAncestor);
function GetEnumerator: TJSONEnumerator<IJSONAncestor>;
procedure Sort(Comparison: TJSONComparison<IJSONAncestor>);
property Index[const Int: Integer]: IJSONAncestor read Get write SetIndex; default;
end;
TJSONArray = class(TJSONValue<IJSONAncestor>, IJSONArray)
private
FList: TList<IJSONAncestor>;
FNull: Boolean;
procedure SetIndex(const Int: Integer; const Value: IJSONAncestor);
protected
function GetIsNull: Boolean; override;
public
constructor Create;
destructor Destroy; override;
procedure AsJSONString(Str: TJSONWriter); override;
procedure Add(Val: IJSONAncestor);
procedure Remove(Val: IJSONAncestor); overload;
procedure Remove(Index: Integer); overload;
procedure Clear;
function Count: Integer;
function Get(const I: Integer): IJSONAncestor;
function GetEnumerator: TJSONEnumerator<IJSONAncestor>;
procedure Sort(Comparison: TJSONComparison<IJSONAncestor>);
property Index[const Int: Integer]: IJSONAncestor read Get write SetIndex; default;
end;
TJSONBuilder = class
private
LGen: TLexGenerator;
FCheckDates: Boolean;
public
constructor Create(const JSON: String; const CheckDates: Boolean);
destructor Destroy; override;
function ReadValue: IJSONAncestor;
procedure ReadString(var Val: IJSONAncestor);
procedure ReadInteger(var Val: IJSONAncestor);
procedure ReadFloat(var Val: IJSONAncestor);
procedure ReadObject(var Val: IJSONAncestor);
procedure ReadTrue(var Val: IJSONAncestor);
procedure ReadFalse(var Val: IJSONAncestor);
procedure ReadNull(var Val: IJSONAncestor);
procedure ReadArray(var Val: IJSONAncestor);
end;
TJSONInterpreter = class
private
LGen: TLexGenerator;
FJSON: IJSONAncestor;
FExceptionBlock: Boolean;
function ReadName(Base: IJSONAncestor): IJSONAncestor;
function ReadArrayIndex(Base: IJSONArray): IJSONAncestor;
function ReadObject(Base: IJSONAncestor): IJSONObject;
function ReadArray(Base: IJSONAncestor): IJSONArray;
function ReadValue(Base: IJSONAncestor): IJSONAncestor;
procedure CreateExcept(const S: String; Args: array of TVarRec); overload;
procedure CreateExcept(const S: String); overload; inline;
public
constructor Create(const Expression: String; JSON: IJSONAncestor; ExceptionBlock: Boolean = False);
destructor Destroy; override;
function ReadExpression: IJSONAncestor;
end;
// ## Parse
// --------
TLexemType = ( ltNil,
ltSValue, ltIValue, ltDValue, ltNull, ltCLeft, ltCRight,
ltBLeft, ltBRight, ltBSlash, ltColon, ltDot, ltVirgule,
ltName,
ltTrue,
ltFalse );
TLexemTypes = set of TLexemType;
TLexBuff = class
public
Capacity: Integer;
Length : Integer;
Buff: PWideChar;
constructor Create;
destructor Destroy; override;
function AsString: String; inline;
function AsInt64: Int64;
function AsDouble: Double;
function AsType: TLexemType;
function AsHInt: Int64;
procedure Add(Ch: WideChar); inline;
procedure Grow;
procedure Clear; inline;
end;
ILexeme = ^TLexeme;
TLexeme = record
Pos: TPosition;
Int: Int64;
Str: String;
Dbl: Double;
LType: TLexemType;
end;
TParseProc = (ppNil, ppInteger, ppDouble, ppString, ppName, ppEscape, ppEscapeUChar);
TTriggerProcs = set of (ttBuffer, ttEnd, ttBack);
TTrigger = class
public
TriggerProcs: TTriggerProcs;
ParseProcs: TParseProc;
NextRoute: TRoute;
BF: Boolean;
ED: Boolean;
BK: Boolean;
constructor Create(NextRoute: TRoute; TriggerProcs: TTriggerProcs; ParseProcs: TParseProc);
end;
TErrorTrigger = class(TTrigger)
private
FMessage: String;
function GetMeessage: String;
procedure SetMessage(const Value: String);
public
constructor Create(const Message: String);
property Message: String read GetMeessage write SetMessage;
end;
TNoRouteTrigger = class(TTrigger)
end;
TUseRouteTrigger = class(TTrigger)
end;
TJumpTrigger = class(TTrigger)
end;
{$WARNINGS OFF}
TRouteChars = set of Char;
{$WARNINGS ON}
TRoute = class
private
FName: String;
FTriggers: array[#0..MaxCHR] of TTrigger;
FTriggerList: TObjectList<TTrigger>;
function GetIndex(Ch: WideChar): TTrigger; inline;
function GetName: String;
public
constructor Create(const Name: String);
destructor Destroy; override;
property Name: String read GetName;
procedure Add(const Chars: TRouteChars; Trigger: TTrigger);
procedure NoRoute(Trigger: TTrigger);
function TryGetRoute(Ch: WideChar; var Trg: TTrigger): Boolean; inline;
property Index[Ch: WideChar]: TTrigger read GetIndex; default;
end;
TLexGrammar = class
private
FRoutes: TList<TRoute>;
protected
function FirstRoute: TRoute; virtual; abstract;
function CreateRoute(const Name: String): TRoute;
function EscapeSupport: Boolean; virtual;
function EscapeRoute: TRoute; virtual;
public
constructor Create; virtual;
destructor Destroy; override;
end;
TJSONGrammar = class(TLexGrammar)
private
rFirst,
rName,
rString,
rString2,
rInt,
rDouble,
rExp, rExpE,
rExpPM,
rEscape,
rEscapeRoute,
rEscapeUChar: TRoute;
protected
function FirstRoute: TRoute; override;
function EscapeSupport: Boolean; override;
function EscapeRoute: TRoute; override;
public
constructor Create; override;
destructor Destroy; override;
end;
TLexGenerator = class
private
FFirstRoute: TRoute;
FBuffer: TLexBuff;
FEscapeBuff: TLexBuff;
FCurr: PWideChar;
FCurrPos: TPosition;
FLexem: ILexeme;
FLexG: TLexGrammar;
FEscapeSupport: Boolean;
FEscapeRoute: TRoute;
FExceptBlock: Boolean;
procedure CreateLexeme;
procedure NextLex;
procedure KillLex; inline;
public
constructor Create(LexG: TLexGrammar = nil; ExceptBlock: Boolean = False);
destructor Destroy; override;
procedure Load(const Source: String);
function Check(LTyp: TLexemType): Boolean; overload;
function Check(LTyp: TLexemTypes): TLexemType; overload;
function CheckName(var S: String): Boolean;
function CheckKill(LTyp: TLexemType): Boolean; overload;
function CheckKill(LTyp: TLexemTypes): TLexemType; overload;
function Current: ILexeme; inline;
end;
TSuperParser = class
public
class function ParseJSON(const S: String; const CheckDateTime: Boolean): IJSONAncestor;
end;
TISO8601 = record
private
FData: TMatch;
FSuccess: Boolean;
FOffset: Integer;
FUseTime: Boolean;
FUseDate: Boolean;
FValue: TDateTime;
FValueType: TDataType;
function NextOffset: Integer;
function GetIntData(const Index: Integer): Integer; overload; inline;
function GetIntData(const Index: Integer; const P: Boolean): Integer; overload;
function GetStrData(const Index: Integer): String; inline;
procedure ReadStructure;
procedure ReadZulu;
function ReadDate: Boolean;
function ReadTime: Boolean;
procedure ReadMS;
procedure ReadTZ(const P: Boolean);
public
constructor Create(const Value: String);
property Value: TDateTime read FValue;
property ValueType: TDataType read FValueType;
property Success: Boolean read FSuccess;
end;
implementation
uses
XSuperObject;
const
FloatFormat : TFormatSettings = ( DecimalSeparator : '.' );
STokenTypes : array [TLexemType] of string = ('Nil',
'String', 'Integer', 'Float', 'Null', '[', ']',
'(', ')', '\', ':', '.', ',',
'',
'TRUE',
'FALSE' );
optAll = [#0..#255];
optWhiteSpace = [' ', #0, #9, #10, #13];
optAlpha = ['a'..'z', 'A'..'Z', '$', '_', #127];
optSym = ['[', ']', '{', '}', ':', ',', '"', '''', '.'];
optNumeric = ['0'..'9'];
optEscape = ['b', 'f', 'n', 'r', 't', 'v', '''', '"', '\'];
optEscapeUnicode = ['u'];
optHex = ['A'..'F', 'a'..'f'] + optNumeric;
optStop = optWhiteSpace + optSym;
HexMap : array [0..15] of WideChar = ('0', '1', '2', '3', '4', '5', '6',
'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f');
var
JSONLexGrammar: TJSONGrammar;
function iff(const Bool: Boolean; _true, _false: Variant): Variant; inline;
begin
if Bool then
Result := _true
else
Result := _false;
end;
function ChrToUTF16(const ChrCode: Integer): String; inline;
begin
Result := '\u' +
HexMap[ChrCode shr 12] +
HexMap[(ChrCode shr 8) and 15] +
HexMap[(ChrCode shr 4) and 15] +
HexMap[ChrCode and 15];
end;
function StrToUTF16(const Str: String): String;
var
Tmp: PWideChar;
begin
if Str = #0 then Exit(ChrToUtf16(0));
Result := '';
if Str = '' then
Exit
else
Tmp := PWideChar(Pointer(Str));
while Tmp^ <> #0 do
begin
case Tmp^ of
#1..#31: case Tmp^ of
#8 : Result := Result + '\b';
#9 : Result := Result + '\t';
#10: Result := Result + '\n';
#11: Result := Result + '\v';
#12: Result := Result + '\f';
#13: Result := Result + '\r';
else
Result := Result + ChrtoUTF16(Ord(Tmp^))
end;
#34{"}: Result := Result + '\"';
#92{\}: Result := Result + '\\';
#127..#65535: Result := Result + ChrtoUTF16(Ord(Tmp^));
else
Result := Result + Tmp^;
end;
Inc(Tmp);
end;
end;
{ TJSONAncestor }
procedure TJSONAncestor.AsJSONString(Str: TJSONWriter);
begin
Str.Append('');
end;
function TJSONAncestor.GetDataType: TDataType;
begin
with TCast.Create(Self) do
begin
Result := DataType;
Free;
end;
end;
function TJSONAncestor.GetIsNull: Boolean;
begin
Result := Self is TJSONNull;
end;
function TJSONAncestor.GetAsVariant: Variant;
begin
with TCast.Create(Self) do
begin
Result := AsVariant;
Free;
end;
end;
procedure TJSONAncestor.SetAsVariant(const Value: Variant);
begin
with TCast.Create(Self) do
begin
AsVariant := Value;
Free;
end;
end;
{ TLexBuff }
procedure TLexBuff.Add(Ch: WideChar);
begin
if Capacity = 0 then Exit;
if (Length >= Capacity - Length) then Grow;
Buff[Length] := Ch;
Inc(Length);
Buff[Length] := #0;
end;
function TLexBuff.AsDouble: Double;
var
Res: Extended;
begin
Add(#0);
{$WARNINGS OFF}
if not TextToFloat(PWideChar(@Buff[0]), Res, fvExtended, FloatFormat) then
{$WARNINGS ON}
raise EConvertError.Create('')
else
Result := Res;
end;
function TLexBuff.AsHInt: Int64;
var
I, J: Integer;
begin
I := 0;
Result := 0;
while I < Length do
begin
J := Ord(Buff[I]);
Inc(I);
case J of
Ord('a')..Ord('f') :
J := J - (Ord('a') - 10);
Ord('A')..Ord('F') :
J := J - (Ord('A') - 10);
Ord('0')..Ord('9') :
J := J - Ord('0');
else
Continue;
end;
Result := (Result shl 4) or J;
end;
end;
function TLexBuff.AsInt64: Int64;
begin
Result := StrToInt64(AsString);
end;
function TLexBuff.AsString: String;
begin
SetString(Result, Buff, Length);
end;
function TLexBuff.AsType: TLexemType;
begin
Result := ltName;
if Length = 0 then
Exit;
case Buff[0] of
'[': Result := ltCLeft;
']': Result := ltCRight;
':': Result := ltColon;
',': Result := ltVirgule;
'{': Result := ltBLeft;
'}': Result := ltBRight;
'.': Result := ltDot;
else
if CompareText(STokenTypes[ltTrue], AsString) = 0 then
Result := ltTrue
else
if CompareText(STokenTypes[ltFalse], AsString) = 0 then
Result := ltFalse
else
if CompareText(STokenTypes[ltNull], AsString) = 0 then
Result := ltNull
end;
end;
procedure TLexBuff.Clear;
begin
Length := 0;
Buff[0] := #0;
end;
constructor TLexBuff.Create;
begin
inherited;
Length := 0;
Capacity := 32;
GetMem(Buff, Capacity * SizeOf(PWideChar));
end;
destructor TLexBuff.Destroy;
begin
if Assigned(Buff) then
FreeMem(Buff);
inherited;
end;
procedure TLexBuff.Grow;
begin
Capacity := Math.Max(Capacity * 2, Length + 8);
ReallocMem(Buff, Capacity * SizeOf(WideChar));
end;
{ TSuperParser }
class function TSuperParser.ParseJSON(const S: String; const CheckDateTime: Boolean): IJSONAncestor;
var
JSON: TJSONBuilder;
begin
JSON := TJSONBuilder.Create(S, CheckDateTime);
try
Result := JSON.ReadValue;
finally
if Assigned(JSON) then
JSON.Free;
end;
end;
{ TTrigger }
{ TTrigger }
constructor TTrigger.Create(NextRoute: TRoute; TriggerProcs: TTriggerProcs;
ParseProcs: TParseProc);
begin
Self.NextRoute := NextRoute;
Self.ParseProcs := ParseProcs;
Self.TriggerProcs := TriggerProcs;
BF := ttBuffer in TriggerProcs;
ED := ttEnd in TriggerProcs;
BK := ttBack in TriggerProcs;
end;
{ TRoute }
procedure TRoute.Add(const Chars: TRouteChars; Trigger: TTrigger);
var
Ch: WideChar;
begin
Ch := #0;
if not FTriggerList.Contains(Trigger) then
FTriggerList.Add(Trigger);
while Ch <= MaxCHR do
begin
{$WARNINGS OFF}
if Ch in Chars then {$WARNINGS ON}
if not Assigned(FTriggers[Ch]) then
FTriggers[Ch] := Trigger;
Inc(Ch);
end;
end;
constructor TRoute.Create(const Name: String);
begin
FName := Name;
FTriggerList := TObjectList<TTrigger>.Create;
end;
destructor TRoute.Destroy;
begin
FTriggerList.Free;
inherited;
end;
function TRoute.GetIndex(Ch: WideChar): TTrigger;
begin
if Ch > MaxCHR then Ch := MaxCHR;
Result := FTriggers[Ch];
end;
function TRoute.GetName: String;
begin
Result := FName;
end;
procedure TRoute.NoRoute(Trigger: TTrigger);
var
Ch: WideChar;
begin
Ch := #0;
if not FTriggerList.Contains(Trigger) then
FTriggerList.Add(Trigger);
while Ch <= MaxCHR do
begin
if not Assigned(FTriggers[Ch]) then
FTriggers[Ch] := Trigger;
Inc(Ch);
end;
end;
function TRoute.TryGetRoute(Ch: WideChar; var Trg: TTrigger): Boolean;
begin
if Ch > MaxCHR then Ch := MaxCHR;
if FTriggers[Ch] <> nil then
begin
Result := True;
Trg := FTriggers[Ch];
end
else
Result := False;
end;
{ TLexGrammar }
constructor TLexGrammar.Create;
begin
FRoutes := TList<TRoute>.Create;
end;
destructor TLexGrammar.Destroy;
begin
FRoutes.Free;
inherited;
end;
function TLexGrammar.EscapeRoute: TRoute;
begin
Result := Nil;
end;
function TLexGrammar.EscapeSupport: Boolean;
begin
Result := False;
end;
function TLexGrammar.CreateRoute(const Name: String): TRoute;
begin
Result := TRoute.Create(Name);
FRoutes.Add(Result);
end;
{ TJSONGrammar }
constructor TJSONGrammar.Create;
begin
inherited;
rFirst := CreateRoute('First');
rName := CreateRoute('Name');
rString := CreateRoute('String');
rString2 := CreateRoute('String2');
rInt := CreateRoute('Int');
rDouble := CreateRoute('Double');
rExp := CreateRoute('Exp');
rExpE := CreateRoute('ExpE');
rExpPM := CreateRoute('ExpPM');
rEscape := CreateRoute('Escape');
rEscapeRoute := CreateRoute('EscapeRoute');
rEscapeUChar := CreateRoute('EscapeUChar');
rEscape.Add( ['\'], TJumpTrigger.Create(rEscapeRoute, [], ppNil ));
rEscapeRoute.Add(['u'], TJumpTrigger.Create(rEscapeUChar, [ttBuffer], ppNil));
rEscapeRoute.NoRoute(TUseRouteTrigger.Create(rEscape, [ttBuffer, ttEnd], ppEscape));
rEscapeUChar.Add(optHex, TUseRouteTrigger.Create(rEscapeUChar, [], ppEscapeUChar));
rEscapeUChar.NoRoute(TErrorTrigger.Create(ERR_UnexpectedTokenILLEGAL));
rFirst.Add(optSym - ['"', ''''], TUseRouteTrigger.Create(rFirst, [ttBuffer, ttEnd], ppName));
rFirst.Add(optAlpha, TUseRouteTrigger.Create(rName, [ttBuffer], ppNil));
rFirst.Add(['"'], TJumpTrigger.Create(rString, [ttBuffer], ppNil));
rFirst.Add([''''], TJumpTrigger.Create(rString2, [ttBuffer], ppNil));
rFirst.Add(optNumeric, TUseRouteTrigger.Create(rInt, [ttBuffer], ppNil));
rFirst.Add(optWhiteSpace - [#0], TJumpTrigger.Create(rFirst, [], ppNil));
rFirst.Add(['-'], TUseRouteTrigger.Create(rInt, [ttBuffer], ppNil));
rFirst.NoRoute(TErrorTrigger.Create(ERR_UnexpectedTokenILLEGAL));
rName.Add(optAll - optWhiteSpace - optSym, TUseRouteTrigger.Create(rName, [], ppNil));
rName.Add(optWhiteSpace, TJumpTrigger.Create(rFirst, [ttEnd, ttBack], ppName));
rName.NoRoute(TJumpTrigger.Create(rFirst, [ttEnd, ttBack], ppName));
rString.Add(optAll - ['"', #0, #10, #13], TUseRouteTrigger.Create(rString, [], ppNil));
rString.Add(['"'], TJumpTrigger.Create(rFirst, [ttEnd], ppString));
rString.Add([#0, #10, #13], TErrorTrigger.Create(ERR_UnexpectedTokenILLEGAL));
rString2.Add(optAll - ['''', #0, #10, #13], TUseRouteTrigger.Create(rString2, [], ppNil));
rString2.Add([''''], TJumpTrigger.Create(rFirst, [ttEnd], ppString));
rString2.Add([#0, #10, #13], TErrorTrigger.Create(ERR_UnexpectedTokenILLEGAL));
rInt.Add(optNumeric, TUseRouteTrigger.Create(rInt, [], ppNil));
rInt.Add(['.'], TUseRouteTrigger.Create(rDouble, [], ppNil));
rInt.Add(['e', 'E'], TUseRouteTrigger.Create(rExp, [], ppNil));
rInt.Add(optStop, TJumpTrigger.Create(rFirst, [ttEnd, ttBack], ppInteger));
rInt.NoRoute(TErrorTrigger.Create(ERR_UnexpectedTokenILLEGAL));
rDouble.Add(optNumeric, TUseRouteTrigger.Create(rDouble, [], ppNil));
rDouble.Add(['e', 'E'], TUseRouteTrigger.Create(rExp, [], ppNil));
rDouble.Add(optStop, TJumpTrigger.Create(rFirst, [ttEnd, ttBack], ppDouble));
rDouble.NoRoute(TErrorTrigger.Create(ERR_UnexpectedTokenILLEGAL));
rExp.Add(['+', '-'], TUseRouteTrigger.Create(rExpPM, [], ppNil));
rExp.Add(optNumeric, TUseRouteTrigger.Create(rExpE, [], ppNil));
rExp.NoRoute(TErrorTrigger.Create(Err_UnexpectedTokenILLEGAL));
rExpPM.Add(optNumeric, TUseRouteTrigger.Create(rExpE, [], ppNil));
rExpPM.NoRoute(TErrorTrigger.Create(Err_UnexpectedTokenILLEGAL));
rExpE.Add(optNumeric, TUseRouteTrigger.Create(rExpE, [], ppNil));
rExpE.Add(optStop, TJumpTrigger.Create(rFirst, [ttEnd, ttBack], ppDouble));
rExpE.NoRoute(TErrorTrigger.Create(Err_UnexpectedTokenILLEGAL));
end;
destructor TJSONGrammar.Destroy;
begin
rFirst.Free;
rName.Free;
rString.Free;
rString2.Free;
rInt.Free;
rDouble.Free;