500 lines
14 KiB
C#
500 lines
14 KiB
C#
#region Header
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/**
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* JsonReader.cs
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* Stream-like access to JSON text.
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*
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* The authors disclaim copyright to this source code. For more details, see
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* the COPYING file included with this distribution.
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**/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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namespace LitJson
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{
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public enum JsonToken
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{
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None,
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ObjectStart,
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PropertyName,
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ObjectEnd,
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ArrayStart,
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ArrayEnd,
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Int,
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Long,
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Double,
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String,
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Boolean,
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Null
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}
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public class JsonReader
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{
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#region Fields
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private static IDictionary<int, IDictionary<int, int[]>> parse_table;
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private Stack<int> automaton_stack;
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private int current_input;
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private int current_symbol;
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private bool end_of_json;
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private bool end_of_input;
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private Lexer lexer;
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private bool parser_in_string;
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private bool parser_return;
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private bool read_started;
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private TextReader reader;
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private bool reader_is_owned;
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private object token_value;
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private JsonToken token;
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#endregion
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#region Public Properties
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public bool AllowComments
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{
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get { return lexer.AllowComments; }
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set { lexer.AllowComments = value; }
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}
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public bool AllowSingleQuotedStrings
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{
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get { return lexer.AllowSingleQuotedStrings; }
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set { lexer.AllowSingleQuotedStrings = value; }
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}
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public bool EndOfInput
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{
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get { return end_of_input; }
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}
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public bool EndOfJson
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{
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get { return end_of_json; }
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}
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public JsonToken Token
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{
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get { return token; }
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}
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public object Value
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{
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get { return token_value; }
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}
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#endregion
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#region Constructors
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static JsonReader()
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{
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PopulateParseTable();
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}
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public JsonReader(string json_text) :
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this(new StringReader(json_text), true)
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{
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}
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public JsonReader(TextReader reader) :
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this(reader, false)
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{
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}
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private JsonReader(TextReader reader, bool owned)
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{
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if (reader == null)
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throw new ArgumentNullException("reader");
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parser_in_string = false;
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parser_return = false;
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read_started = false;
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automaton_stack = new Stack<int>();
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automaton_stack.Push((int)ParserToken.End);
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automaton_stack.Push((int)ParserToken.Text);
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lexer = new Lexer(reader);
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end_of_input = false;
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end_of_json = false;
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this.reader = reader;
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reader_is_owned = owned;
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}
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#endregion
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#region Static Methods
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private static void PopulateParseTable()
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{
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// See section A.2. of the manual for details
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parse_table = new Dictionary<int, IDictionary<int, int[]>>();
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TableAddRow(ParserToken.Array);
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TableAddCol(ParserToken.Array, '[',
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'[',
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(int)ParserToken.ArrayPrime);
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TableAddRow(ParserToken.ArrayPrime);
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TableAddCol(ParserToken.ArrayPrime, '"',
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(int)ParserToken.Value,
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(int)ParserToken.ValueRest,
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']');
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TableAddCol(ParserToken.ArrayPrime, '[',
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(int)ParserToken.Value,
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(int)ParserToken.ValueRest,
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']');
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TableAddCol(ParserToken.ArrayPrime, ']',
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']');
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TableAddCol(ParserToken.ArrayPrime, '{',
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(int)ParserToken.Value,
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(int)ParserToken.ValueRest,
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']');
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TableAddCol(ParserToken.ArrayPrime, (int)ParserToken.Number,
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(int)ParserToken.Value,
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(int)ParserToken.ValueRest,
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']');
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TableAddCol(ParserToken.ArrayPrime, (int)ParserToken.True,
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(int)ParserToken.Value,
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(int)ParserToken.ValueRest,
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']');
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TableAddCol(ParserToken.ArrayPrime, (int)ParserToken.False,
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(int)ParserToken.Value,
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(int)ParserToken.ValueRest,
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']');
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TableAddCol(ParserToken.ArrayPrime, (int)ParserToken.Null,
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(int)ParserToken.Value,
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(int)ParserToken.ValueRest,
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']');
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TableAddRow(ParserToken.Object);
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TableAddCol(ParserToken.Object, '{',
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'{',
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(int)ParserToken.ObjectPrime);
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TableAddRow(ParserToken.ObjectPrime);
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TableAddCol(ParserToken.ObjectPrime, '"',
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(int)ParserToken.Pair,
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(int)ParserToken.PairRest,
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'}');
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TableAddCol(ParserToken.ObjectPrime, '}',
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'}');
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TableAddRow(ParserToken.Pair);
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TableAddCol(ParserToken.Pair, '"',
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(int)ParserToken.String,
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':',
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(int)ParserToken.Value);
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TableAddRow(ParserToken.PairRest);
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TableAddCol(ParserToken.PairRest, ',',
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',',
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(int)ParserToken.Pair,
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(int)ParserToken.PairRest);
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TableAddCol(ParserToken.PairRest, '}',
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(int)ParserToken.Epsilon);
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TableAddRow(ParserToken.String);
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TableAddCol(ParserToken.String, '"',
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'"',
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(int)ParserToken.CharSeq,
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'"');
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TableAddRow(ParserToken.Text);
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TableAddCol(ParserToken.Text, '[',
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(int)ParserToken.Array);
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TableAddCol(ParserToken.Text, '{',
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(int)ParserToken.Object);
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TableAddRow(ParserToken.Value);
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TableAddCol(ParserToken.Value, '"',
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(int)ParserToken.String);
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TableAddCol(ParserToken.Value, '[',
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(int)ParserToken.Array);
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TableAddCol(ParserToken.Value, '{',
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(int)ParserToken.Object);
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TableAddCol(ParserToken.Value, (int)ParserToken.Number,
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(int)ParserToken.Number);
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TableAddCol(ParserToken.Value, (int)ParserToken.True,
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(int)ParserToken.True);
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TableAddCol(ParserToken.Value, (int)ParserToken.False,
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(int)ParserToken.False);
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TableAddCol(ParserToken.Value, (int)ParserToken.Null,
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(int)ParserToken.Null);
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TableAddRow(ParserToken.ValueRest);
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TableAddCol(ParserToken.ValueRest, ',',
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',',
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(int)ParserToken.Value,
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(int)ParserToken.ValueRest);
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TableAddCol(ParserToken.ValueRest, ']',
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(int)ParserToken.Epsilon);
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}
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private static void TableAddCol(ParserToken row, int col,
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params int[] symbols)
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{
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parse_table[(int)row].Add(col, symbols);
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}
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private static void TableAddRow(ParserToken rule)
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{
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parse_table.Add((int)rule, new Dictionary<int, int[]>());
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}
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#endregion
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#region Private Methods
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private void ProcessNumber(string number)
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{
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if (number.IndexOf('.') != -1 ||
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number.IndexOf('e') != -1 ||
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number.IndexOf('E') != -1)
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{
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double n_double;
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if (Double.TryParse(number, out n_double))
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{
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token = JsonToken.Double;
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token_value = n_double;
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return;
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}
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}
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int n_int32;
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if (Int32.TryParse(number, out n_int32))
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{
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token = JsonToken.Int;
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token_value = n_int32;
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return;
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}
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long n_int64;
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if (Int64.TryParse(number, out n_int64))
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{
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token = JsonToken.Long;
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token_value = n_int64;
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return;
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}
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// Shouldn't happen, but just in case, return something
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token = JsonToken.Int;
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token_value = 0;
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}
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private void ProcessSymbol()
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{
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if (current_symbol == '[')
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{
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token = JsonToken.ArrayStart;
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parser_return = true;
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}
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else if (current_symbol == ']')
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{
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token = JsonToken.ArrayEnd;
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parser_return = true;
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}
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else if (current_symbol == '{')
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{
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token = JsonToken.ObjectStart;
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parser_return = true;
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}
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else if (current_symbol == '}')
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{
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token = JsonToken.ObjectEnd;
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parser_return = true;
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}
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else if (current_symbol == '"')
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{
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if (parser_in_string)
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{
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parser_in_string = false;
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parser_return = true;
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}
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else
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{
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if (token == JsonToken.None)
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token = JsonToken.String;
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parser_in_string = true;
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}
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}
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else if (current_symbol == (int)ParserToken.CharSeq)
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{
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token_value = lexer.StringValue;
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}
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else if (current_symbol == (int)ParserToken.False)
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{
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token = JsonToken.Boolean;
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token_value = false;
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parser_return = true;
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}
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else if (current_symbol == (int)ParserToken.Null)
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{
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token = JsonToken.Null;
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parser_return = true;
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}
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else if (current_symbol == (int)ParserToken.Number)
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{
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ProcessNumber(lexer.StringValue);
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parser_return = true;
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}
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else if (current_symbol == (int)ParserToken.Pair)
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{
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token = JsonToken.PropertyName;
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}
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else if (current_symbol == (int)ParserToken.True)
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{
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token = JsonToken.Boolean;
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token_value = true;
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parser_return = true;
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}
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}
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private bool ReadToken()
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{
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if (end_of_input)
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return false;
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lexer.NextToken();
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if (lexer.EndOfInput)
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{
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Close();
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return false;
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}
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current_input = lexer.Token;
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return true;
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}
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#endregion
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public void Close()
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{
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if (end_of_input)
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return;
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end_of_input = true;
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end_of_json = true;
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if (reader_is_owned)
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reader.Close();
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reader = null;
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}
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public bool Read()
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{
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if (end_of_input)
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return false;
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if (end_of_json)
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{
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end_of_json = false;
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automaton_stack.Clear();
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automaton_stack.Push((int)ParserToken.End);
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automaton_stack.Push((int)ParserToken.Text);
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}
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parser_in_string = false;
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parser_return = false;
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token = JsonToken.None;
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token_value = null;
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if (!read_started)
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{
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read_started = true;
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if (!ReadToken())
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return false;
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}
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int[] entry_symbols;
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while (true)
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{
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if (parser_return)
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{
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if (automaton_stack.Peek() == (int)ParserToken.End)
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end_of_json = true;
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return true;
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}
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current_symbol = automaton_stack.Pop();
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ProcessSymbol();
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if (current_symbol == current_input)
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{
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if (!ReadToken())
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{
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if (automaton_stack.Peek() != (int)ParserToken.End)
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throw new JsonException(
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"Input doesn't evaluate to proper JSON text");
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if (parser_return)
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return true;
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return false;
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}
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continue;
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}
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try
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{
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entry_symbols =
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parse_table[current_symbol][current_input];
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}
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catch (KeyNotFoundException e)
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{
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throw new JsonException((ParserToken)current_input, e);
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}
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if (entry_symbols[0] == (int)ParserToken.Epsilon)
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continue;
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for (int i = entry_symbols.Length - 1; i >= 0; i--)
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automaton_stack.Push(entry_symbols[i]);
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}
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}
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}
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} |