465 lines
14 KiB
C#
465 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 bool skip_non_members;
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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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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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get { return lexer.AllowSingleQuotedStrings; }
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set { lexer.AllowSingleQuotedStrings = value; }
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}
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public bool SkipNonMembers {
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get { return skip_non_members; }
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set { skip_non_members = value; }
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}
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public bool EndOfInput {
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get { return end_of_input; }
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}
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public bool EndOfJson {
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get { return end_of_json; }
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}
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public JsonToken Token {
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get { return token; }
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}
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public object Value {
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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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skip_non_members = true;
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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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double n_double;
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if (Double.TryParse (number, out n_double)) {
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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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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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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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token = JsonToken.ArrayStart;
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parser_return = true;
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} else if (current_symbol == ']') {
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token = JsonToken.ArrayEnd;
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parser_return = true;
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} else if (current_symbol == '{') {
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token = JsonToken.ObjectStart;
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parser_return = true;
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} else if (current_symbol == '}') {
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token = JsonToken.ObjectEnd;
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parser_return = true;
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} else if (current_symbol == '"') {
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if (parser_in_string) {
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parser_in_string = false;
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parser_return = true;
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} else {
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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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} else if (current_symbol == (int) ParserToken.CharSeq) {
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token_value = lexer.StringValue;
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} else if (current_symbol == (int) ParserToken.False) {
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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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} else if (current_symbol == (int) ParserToken.Null) {
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token = JsonToken.Null;
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parser_return = true;
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} else if (current_symbol == (int) ParserToken.Number) {
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ProcessNumber (lexer.StringValue);
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parser_return = true;
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} else if (current_symbol == (int) ParserToken.Pair) {
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token = JsonToken.PropertyName;
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} else if (current_symbol == (int) ParserToken.True) {
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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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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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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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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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if (parser_return) {
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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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if (! ReadToken ()) {
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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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entry_symbols =
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parse_table[current_symbol][current_input];
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} catch (KeyNotFoundException e) {
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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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}
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