implab/ImplabNet Files · Implab/JSON/JSONParser.cs

code cleanup

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             JSONParser.cs
        
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             / Implab / JSON / JSONParser.cs
          
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        cin
    
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      using Implab;

      using Implab.Parsing;

      using System;

      using System.Collections.Generic;

      using System.Diagnostics;

        cin
    
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      using System.IO;

        cin
    
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      using System.Linq;

      using System.Text;

      using System.Threading.Tasks;

      namespace Implab.JSON {

          /// <summary>

          /// internal

          /// </summary>

          public struct JSONParserContext {

              public string memberName;

              public JSONElementContext elementContext;

          }

          /// <summary>

          /// Pull парсер JSON данных.

          /// </summary>

        cin
    
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          /// <remarks>

          /// Следует отметить отдельную интерпретацию свойства <see cref="Level"/>,

          /// оно означает текущий уровень вложенности объектов, однако закрывающий

          /// элемент объекта и массива имеет уровень меньше, чем сам объект.

          /// <code>

          /// { // Level = 1

          ///     "name" : "Peter", // Level = 1

          ///     "address" : { // Level = 2

          ///         city : "Stern" // Level = 2

          ///     } // Level = 1

          /// } // Level = 0

          /// </code>

          /// </remarks>

        cin
    
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          public class JSONParser : DFAutomaton<JSONParserContext>, IDisposable {

        cin
    
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              enum MemberContext {

                  MemberName,

                  MemberValue

        cin
    
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              }

        cin
    
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              static readonly EnumAlphabet<JsonTokenType> _alphabet = EnumAlphabet<JsonTokenType>.FullAlphabet;

              static readonly DFAStateDescriptior[] _jsonDFA;

              static readonly DFAStateDescriptior[] _objectDFA;

              static readonly DFAStateDescriptior[] _arrayDFA;

              static JSONParser() {

                  var jsonExpression = Token.New(JsonTokenType.BeginObject, JsonTokenType.BeginArray).Tag(0);

                  var valueExpression = Token.New(JsonTokenType.BeginArray, JsonTokenType.BeginObject, JsonTokenType.Literal, JsonTokenType.Number, JsonTokenType.String);

                  var memberExpression = Token.New(JsonTokenType.String).Cat(Token.New(JsonTokenType.NameSeparator)).Cat(valueExpression);

                  var objectExpression = memberExpression

                      .Cat(

                          Token.New(JsonTokenType.ValueSeparator)

                          .Cat(memberExpression)

                          .EClosure()

                      )

                      .Optional()

                      .Cat(Token.New(JsonTokenType.EndObject))

                      .Tag(0);

                  var arrayExpression = valueExpression

                      .Cat(

                          Token.New(JsonTokenType.ValueSeparator)

                          .Cat(valueExpression)

                          .EClosure()

                      )

                      .Optional()

                      .Cat(Token.New(JsonTokenType.EndArray))

                      .Tag(0);

                  _jsonDFA = BuildDFA(jsonExpression).States;

                  _objectDFA = BuildDFA(objectExpression).States;

                  _arrayDFA = BuildDFA(arrayExpression).States;

              }

              static EDFADefinition<JsonTokenType> BuildDFA(Token expr) {

                  var builder = new DFABuilder();

                  var dfa = new EDFADefinition<JsonTokenType>(_alphabet);

                  expr.Accept(builder);

                  builder.BuildDFA(dfa);

                  return dfa;

              }

              JSONScanner m_scanner;

              MemberContext m_memberContext;

              JSONElementType m_elementType;

              object m_elementValue;

        cin
    
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              /// <summary>

              /// Создает новый парсер на основе строки, содержащей JSON

              /// </summary>

              /// <param name="text"></param>

        cin
    
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              public JSONParser(string text)

        cin
    
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                  : base(_jsonDFA, INITIAL_STATE, new JSONParserContext { elementContext = JSONElementContext.None, memberName = String.Empty }) {

        cin
    
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                  Safe.ArgumentNotEmpty(text, "text");

                  m_scanner = new JSONScanner();

                  m_scanner.Feed(text.ToCharArray());

              }

        cin
    
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              /// <summary>

              /// Создает новый экземпляр парсера, на основе текстового потока.

              /// </summary>

              /// <param name="reader">Текстовый поток.</param>

              /// <param name="dispose">Признак того, что парсер должен конролировать время жизни входного потока.</param>

              public JSONParser(TextReader reader, bool dispose)

                  : base(_jsonDFA, INITIAL_STATE, new JSONParserContext { elementContext = JSONElementContext.None, memberName = String.Empty }) {

                  Safe.ArgumentNotNull(reader, "reader");

                  m_scanner = new JSONScanner();

                  m_scanner.Feed(reader, dispose);

              }

              /// <summary>

              /// Тип текущего элемента на котором стоит парсер.

              /// </summary>

        cin
    
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              public JSONElementType ElementType {

                  get { return m_elementType; }

              }

        cin
    
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              /// <summary>

              /// Имя элемента - имя свойства родительского контейнера. Для элементов массивов и корневого всегда

              /// пустая строка.

              /// </summary>

        cin
    
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              public string ElementName {

                  get { return m_context.info.memberName; }

              }

        cin
    
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              /// <summary>

              /// Значение элемента. Только для элементов типа <see cref="JSONElementType.Value"/>, для остальных <c>null</c>

              /// </summary>

        cin
    
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              public object ElementValue {

                  get { return m_elementValue; }

              }

        cin
    
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              /// <summary>

              /// Читает слеюудущий объект из потока

              /// </summary>

              /// <returns><c>true</c> - операция чтения прошла успешно, <c>false</c> - конец данных</returns>

        cin
    
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              public bool Read() {

                  if (m_context.current == UNREACHEBLE_STATE)

                      throw new InvalidOperationException("The parser is in invalid state");

                  object tokenValue;

                  JsonTokenType tokenType;

                  m_context.info.memberName = String.Empty;

                  while (m_scanner.ReadToken(out tokenValue, out tokenType)) {

                      Move((int)tokenType);

                      if (m_context.current == UNREACHEBLE_STATE)

                          UnexpectedToken(tokenValue, tokenType);

                      switch (tokenType) {

                          case JsonTokenType.BeginObject:

                              Switch(

                                  _objectDFA,

                                  INITIAL_STATE,

        cin
    
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                                  new JSONParserContext {

        cin
    
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                                      memberName = m_context.info.memberName,

                                      elementContext = JSONElementContext.Object

                                  }

                              );

                              m_elementValue = null;

                              m_memberContext = MemberContext.MemberName;

                              m_elementType = JSONElementType.BeginObject;

                              return true;

                          case JsonTokenType.EndObject:

                              Restore();

                              m_elementValue = null;

                              m_elementType = JSONElementType.EndObject;

                              return true;

                          case JsonTokenType.BeginArray:

                              Switch(

                                  _arrayDFA,

                                  INITIAL_STATE,

                                  new JSONParserContext {

                                      memberName = m_context.info.memberName,

                                      elementContext = JSONElementContext.Array

                                  }

                              );

                              m_elementValue = null;

                              m_memberContext = MemberContext.MemberValue;

                              m_elementType = JSONElementType.BeginArray;

                              return true;

                          case JsonTokenType.EndArray:

                              Restore();

                              m_elementValue = null;

                              m_elementType = JSONElementType.EndArray;

                              return true;

                          case JsonTokenType.String:

                              if (m_memberContext == MemberContext.MemberName) {

                                  m_context.info.memberName = (string)tokenValue;

                                  break;

                              } else {

                                  m_elementType = JSONElementType.Value;

                                  m_elementValue = tokenValue;

                                  return true;

                              }

                          case JsonTokenType.Number:

                              m_elementType = JSONElementType.Value;

                              m_elementValue = tokenValue;

                              return true;

                          case JsonTokenType.Literal:

                              m_elementType = JSONElementType.Value;

                              m_elementValue = ParseLiteral((string)tokenValue);

                              return true;

                          case JsonTokenType.NameSeparator:

                              m_memberContext = MemberContext.MemberValue;

                              break;

                          case JsonTokenType.ValueSeparator:

                              m_memberContext = m_context.info.elementContext == JSONElementContext.Object ? MemberContext.MemberName : MemberContext.MemberValue;

                              break;

                          default:

                              UnexpectedToken(tokenValue, tokenType);

                              break;

                      }

                  }

                  if (m_context.info.elementContext != JSONElementContext.None)

                      throw new ParserException("Unexpedted end of data");

                  return false;

              }

              object ParseLiteral(string literal) {

                  switch (literal) {

                      case "null":

                          return null;

        cin
    
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                      case "false":

        cin
    
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                          return false;

                      case "true":

                          return true;

                      default:

                          UnexpectedToken(literal, JsonTokenType.Literal);

                          return null; // avoid compliler error

                  }

              }

              void UnexpectedToken(object value, JsonTokenType tokenType) {

                  throw new ParserException(String.Format("Unexpected token {0}: '{1}'", tokenType, value));

              }

        cin
    
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        cin
    
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              /// <summary>

              /// Признак конца потока

              /// </summary>

        cin
    
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              public bool EOF {

                  get {

                      return m_scanner.EOF;

                  }

              }

        cin
    
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              protected virtual void Dispose(bool disposing) {

                  if (disposing) {

                      m_scanner.Dispose();

                  }

              }

              /// <summary>

              /// Освобождает парсер и связанный с ним сканнер.

              /// </summary>

              public void Dispose() {

                  Dispose(true);

                  GC.SuppressFinalize(this);

              }

              ~JSONParser() {

                  Dispose(false);

              }

        cin
    
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        cin
    
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              /// <summary>

              /// Переходит в конец текущего объекта.

              /// </summary>

              public void SeekElementEnd() {

                  var level = Level - 1;

        cin
    
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                  Debug.Assert(level >= 0);

                  while (Level != level)

                      Read();

              }

        cin
    
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          }

      }

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cin Added initial JSON support...	r55	using Implab;
		using Implab.Parsing;
		using System;
		using System.Collections.Generic;
		using System.Diagnostics;
cin code cleanup	r59	using System.IO;
cin Added initial JSON support...	r55	using System.Linq;
		using System.Text;
		using System.Threading.Tasks;

		namespace Implab.JSON {
		/// <summary>
		/// internal
		/// </summary>
		public struct JSONParserContext {
		public string memberName;
		public JSONElementContext elementContext;
		}

		/// <summary>
		/// Pull парсер JSON данных.
		/// </summary>
cin refactoring	r70	/// <remarks>
		/// Следует отметить отдельную интерпретацию свойства <see cref="Level"/>,
		/// оно означает текущий уровень вложенности объектов, однако закрывающий
		/// элемент объекта и массива имеет уровень меньше, чем сам объект.
		/// <code>
		/// { // Level = 1
		/// "name" : "Peter", // Level = 1
		/// "address" : { // Level = 2
		/// city : "Stern" // Level = 2
		/// } // Level = 1
		/// } // Level = 0
		/// </code>
		/// </remarks>
cin code cleanup	r59	public class JSONParser : DFAutomaton<JSONParserContext>, IDisposable {
cin Added initial JSON support...	r55
		enum MemberContext {
		MemberName,
		MemberValue
cin code cleanup	r59	}
cin Added initial JSON support...	r55
		static readonly EnumAlphabet<JsonTokenType> _alphabet = EnumAlphabet<JsonTokenType>.FullAlphabet;
		static readonly DFAStateDescriptior[] _jsonDFA;
		static readonly DFAStateDescriptior[] _objectDFA;
		static readonly DFAStateDescriptior[] _arrayDFA;

		static JSONParser() {
		var jsonExpression = Token.New(JsonTokenType.BeginObject, JsonTokenType.BeginArray).Tag(0);

		var valueExpression = Token.New(JsonTokenType.BeginArray, JsonTokenType.BeginObject, JsonTokenType.Literal, JsonTokenType.Number, JsonTokenType.String);
		var memberExpression = Token.New(JsonTokenType.String).Cat(Token.New(JsonTokenType.NameSeparator)).Cat(valueExpression);
		var objectExpression = memberExpression
		.Cat(
		Token.New(JsonTokenType.ValueSeparator)
		.Cat(memberExpression)
		.EClosure()
		)
		.Optional()
		.Cat(Token.New(JsonTokenType.EndObject))
		.Tag(0);
		var arrayExpression = valueExpression
		.Cat(
		Token.New(JsonTokenType.ValueSeparator)
		.Cat(valueExpression)
		.EClosure()
		)
		.Optional()
		.Cat(Token.New(JsonTokenType.EndArray))
		.Tag(0);

		_jsonDFA = BuildDFA(jsonExpression).States;
		_objectDFA = BuildDFA(objectExpression).States;
		_arrayDFA = BuildDFA(arrayExpression).States;
		}

		static EDFADefinition<JsonTokenType> BuildDFA(Token expr) {
		var builder = new DFABuilder();
		var dfa = new EDFADefinition<JsonTokenType>(_alphabet);
		expr.Accept(builder);

		builder.BuildDFA(dfa);
		return dfa;
		}

		JSONScanner m_scanner;
		MemberContext m_memberContext;

		JSONElementType m_elementType;
		object m_elementValue;

cin code cleanup	r59	/// <summary>
		/// Создает новый парсер на основе строки, содержащей JSON
		/// </summary>
		/// <param name="text"></param>
cin Added initial JSON support...	r55	public JSONParser(string text)
cin code cleanup	r59	: base(_jsonDFA, INITIAL_STATE, new JSONParserContext { elementContext = JSONElementContext.None, memberName = String.Empty }) {
cin Added initial JSON support...	r55	Safe.ArgumentNotEmpty(text, "text");
		m_scanner = new JSONScanner();
		m_scanner.Feed(text.ToCharArray());
		}

cin code cleanup	r59	/// <summary>
		/// Создает новый экземпляр парсера, на основе текстового потока.
		/// </summary>
		/// <param name="reader">Текстовый поток.</param>
		/// <param name="dispose">Признак того, что парсер должен конролировать время жизни входного потока.</param>
		public JSONParser(TextReader reader, bool dispose)
		: base(_jsonDFA, INITIAL_STATE, new JSONParserContext { elementContext = JSONElementContext.None, memberName = String.Empty }) {
		Safe.ArgumentNotNull(reader, "reader");
		m_scanner = new JSONScanner();
		m_scanner.Feed(reader, dispose);
		}

		/// <summary>
		/// Тип текущего элемента на котором стоит парсер.
		/// </summary>
cin Added initial JSON support...	r55	public JSONElementType ElementType {
		get { return m_elementType; }
		}

cin code cleanup	r59	/// <summary>
		/// Имя элемента - имя свойства родительского контейнера. Для элементов массивов и корневого всегда
		/// пустая строка.
		/// </summary>
cin Added initial JSON support...	r55	public string ElementName {
		get { return m_context.info.memberName; }
		}

cin code cleanup	r59	/// <summary>
		/// Значение элемента. Только для элементов типа <see cref="JSONElementType.Value"/>, для остальных <c>null</c>
		/// </summary>
cin Added initial JSON support...	r55	public object ElementValue {
		get { return m_elementValue; }
		}

cin code cleanup	r59	/// <summary>
		/// Читает слеюудущий объект из потока
		/// </summary>
		/// <returns><c>true</c> - операция чтения прошла успешно, <c>false</c> - конец данных</returns>
cin Added initial JSON support...	r55	public bool Read() {
		if (m_context.current == UNREACHEBLE_STATE)
		throw new InvalidOperationException("The parser is in invalid state");
		object tokenValue;
		JsonTokenType tokenType;
		m_context.info.memberName = String.Empty;
		while (m_scanner.ReadToken(out tokenValue, out tokenType)) {
		Move((int)tokenType);
		if (m_context.current == UNREACHEBLE_STATE)
		UnexpectedToken(tokenValue, tokenType);
		switch (tokenType) {
		case JsonTokenType.BeginObject:
		Switch(
		_objectDFA,
		INITIAL_STATE,
cin code cleanup	r59	new JSONParserContext {
cin Added initial JSON support...	r55	memberName = m_context.info.memberName,
		elementContext = JSONElementContext.Object
		}
		);
		m_elementValue = null;
		m_memberContext = MemberContext.MemberName;
		m_elementType = JSONElementType.BeginObject;
		return true;
		case JsonTokenType.EndObject:
		Restore();
		m_elementValue = null;
		m_elementType = JSONElementType.EndObject;
		return true;
		case JsonTokenType.BeginArray:
		Switch(
		_arrayDFA,
		INITIAL_STATE,
		new JSONParserContext {
		memberName = m_context.info.memberName,
		elementContext = JSONElementContext.Array
		}
		);
		m_elementValue = null;
		m_memberContext = MemberContext.MemberValue;
		m_elementType = JSONElementType.BeginArray;
		return true;
		case JsonTokenType.EndArray:
		Restore();
		m_elementValue = null;
		m_elementType = JSONElementType.EndArray;
		return true;
		case JsonTokenType.String:
		if (m_memberContext == MemberContext.MemberName) {
		m_context.info.memberName = (string)tokenValue;
		break;
		} else {
		m_elementType = JSONElementType.Value;
		m_elementValue = tokenValue;
		return true;
		}
		case JsonTokenType.Number:
		m_elementType = JSONElementType.Value;
		m_elementValue = tokenValue;
		return true;
		case JsonTokenType.Literal:
		m_elementType = JSONElementType.Value;
		m_elementValue = ParseLiteral((string)tokenValue);
		return true;
		case JsonTokenType.NameSeparator:
		m_memberContext = MemberContext.MemberValue;
		break;
		case JsonTokenType.ValueSeparator:
		m_memberContext = m_context.info.elementContext == JSONElementContext.Object ? MemberContext.MemberName : MemberContext.MemberValue;
		break;
		default:
		UnexpectedToken(tokenValue, tokenType);
		break;
		}
		}
		if (m_context.info.elementContext != JSONElementContext.None)
		throw new ParserException("Unexpedted end of data");
		return false;
		}

		object ParseLiteral(string literal) {
		switch (literal) {
		case "null":
		return null;
cin code cleanup	r59	case "false":
cin Added initial JSON support...	r55	return false;
		case "true":
		return true;
		default:
		UnexpectedToken(literal, JsonTokenType.Literal);
		return null; // avoid compliler error
		}
		}

		void UnexpectedToken(object value, JsonTokenType tokenType) {
		throw new ParserException(String.Format("Unexpected token {0}: '{1}'", tokenType, value));
		}

cin minor changes	r57
cin code cleanup	r59	/// <summary>
		/// Признак конца потока
		/// </summary>
cin minor changes	r57	public bool EOF {
		get {
		return m_scanner.EOF;
		}
		}
cin code cleanup	r59
		protected virtual void Dispose(bool disposing) {
		if (disposing) {
		m_scanner.Dispose();
		}
		}

		/// <summary>
		/// Освобождает парсер и связанный с ним сканнер.
		/// </summary>
		public void Dispose() {
		Dispose(true);
		GC.SuppressFinalize(this);
		}

		~JSONParser() {
		Dispose(false);
		}
cin Added Skip method to JSON parser to skip contents of the current node	r62
cin refactoring	r70	/// <summary>
		/// Переходит в конец текущего объекта.
		/// </summary>
		public void SeekElementEnd() {
		var level = Level - 1;
cin Added Skip method to JSON parser to skip contents of the current node	r62
		Debug.Assert(level >= 0);

		while (Level != level)
		Read();
		}
cin Added initial JSON support...	r55	}

		}