443 lines
7.7 KiB
C#
443 lines
7.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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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 class JsonWriter
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{
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private static NumberFormatInfo number_format;
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private WriterContext context;
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private Stack<WriterContext> ctx_stack;
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private bool has_reached_end;
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private char[] hex_seq;
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private int indentation;
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private int indent_value;
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private StringBuilder inst_string_builder;
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private bool pretty_print;
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private bool validate;
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private TextWriter writer;
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public int IndentValue
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{
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get
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{
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return indent_value;
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}
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set
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{
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indentation = indentation / indent_value * value;
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indent_value = value;
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}
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}
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public bool PrettyPrint
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{
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get
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{
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return pretty_print;
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}
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set
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{
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pretty_print = value;
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}
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}
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public TextWriter TextWriter
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{
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get
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{
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return writer;
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}
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}
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public bool Validate
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{
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get
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{
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return validate;
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}
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set
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{
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validate = value;
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}
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}
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static JsonWriter()
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{
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number_format = NumberFormatInfo.InvariantInfo;
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}
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public JsonWriter()
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{
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inst_string_builder = new StringBuilder();
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writer = new StringWriter(inst_string_builder);
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Init();
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}
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public JsonWriter(StringBuilder sb)
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: this(new StringWriter(sb))
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{
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}
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public JsonWriter(TextWriter writer)
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{
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if (writer == null)
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{
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throw new ArgumentNullException("writer");
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}
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this.writer = writer;
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Init();
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}
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private void DoValidation(Condition cond)
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{
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if (!context.ExpectingValue)
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{
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context.Count++;
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}
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if (!validate)
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{
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return;
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}
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if (has_reached_end)
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{
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throw new JsonException("A complete JSON symbol has already been written");
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}
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switch (cond)
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{
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case Condition.InArray:
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if (!context.InArray)
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{
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throw new JsonException("Can't close an array here");
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}
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break;
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case Condition.InObject:
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if (!context.InObject || context.ExpectingValue)
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{
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throw new JsonException("Can't close an object here");
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}
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break;
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case Condition.NotAProperty:
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if (context.InObject && !context.ExpectingValue)
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{
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throw new JsonException("Expected a property");
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}
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break;
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case Condition.Property:
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if (!context.InObject || context.ExpectingValue)
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{
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throw new JsonException("Can't add a property here");
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}
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break;
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case Condition.Value:
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if (!context.InArray && (!context.InObject || !context.ExpectingValue))
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{
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throw new JsonException("Can't add a value here");
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}
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break;
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}
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}
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private void Init()
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{
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has_reached_end = false;
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hex_seq = new char[4];
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indentation = 0;
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indent_value = 4;
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pretty_print = false;
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validate = true;
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ctx_stack = new Stack<WriterContext>();
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context = new WriterContext();
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ctx_stack.Push(context);
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}
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private static void IntToHex(int n, char[] hex)
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{
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for (int i = 0; i < 4; i++)
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{
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int num = n % 16;
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if (num < 10)
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{
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hex[3 - i] = (char)(48 + num);
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}
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else
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{
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hex[3 - i] = (char)(65 + (num - 10));
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}
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n >>= 4;
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}
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}
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private void Indent()
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{
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if (pretty_print)
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{
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indentation += indent_value;
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}
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}
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private void Put(string str)
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{
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if (pretty_print && !context.ExpectingValue)
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{
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for (int i = 0; i < indentation; i++)
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{
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writer.Write(' ');
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}
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}
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writer.Write(str);
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}
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private void PutNewline()
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{
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PutNewline(true);
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}
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private void PutNewline(bool add_comma)
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{
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if (add_comma && !context.ExpectingValue && context.Count > 1)
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{
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writer.Write(',');
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}
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if (pretty_print && !context.ExpectingValue)
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{
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writer.Write('\n');
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}
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}
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private void PutString(string str)
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{
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Put(string.Empty);
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writer.Write('"');
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int length = str.Length;
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for (int i = 0; i < length; i++)
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{
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switch (str[i])
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{
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case '\n':
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writer.Write("\\n");
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continue;
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case '\r':
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writer.Write("\\r");
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continue;
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case '\t':
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writer.Write("\\t");
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continue;
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case '"':
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case '\\':
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writer.Write('\\');
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writer.Write(str[i]);
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continue;
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case '\f':
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writer.Write("\\f");
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continue;
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case '\b':
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writer.Write("\\b");
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continue;
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}
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if (str[i] >= ' ' && str[i] <= '~')
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{
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writer.Write(str[i]);
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continue;
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}
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IntToHex(str[i], hex_seq);
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writer.Write("\\u");
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writer.Write(hex_seq);
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}
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writer.Write('"');
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}
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private void Unindent()
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{
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if (pretty_print)
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{
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indentation -= indent_value;
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}
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}
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public override string ToString()
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{
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if (inst_string_builder == null)
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{
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return string.Empty;
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}
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return inst_string_builder.ToString();
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}
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public void Reset()
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{
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has_reached_end = false;
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ctx_stack.Clear();
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context = new WriterContext();
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ctx_stack.Push(context);
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if (inst_string_builder != null)
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{
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inst_string_builder.Remove(0, inst_string_builder.Length);
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}
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}
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public void Write(bool boolean)
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{
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DoValidation(Condition.Value);
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PutNewline();
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Put((!boolean) ? "false" : "true");
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context.ExpectingValue = false;
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}
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public void Write(decimal number)
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{
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DoValidation(Condition.Value);
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PutNewline();
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Put(Convert.ToString(number, number_format));
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context.ExpectingValue = false;
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}
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public void Write(double number)
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{
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DoValidation(Condition.Value);
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PutNewline();
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string text = Convert.ToString(number, number_format);
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Put(text);
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if (text.IndexOf('.') == -1 && text.IndexOf('E') == -1)
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{
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writer.Write(".0");
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}
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context.ExpectingValue = false;
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}
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public void Write(int number)
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{
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DoValidation(Condition.Value);
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PutNewline();
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Put(Convert.ToString(number, number_format));
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context.ExpectingValue = false;
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}
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public void Write(long number)
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{
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DoValidation(Condition.Value);
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PutNewline();
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Put(Convert.ToString(number, number_format));
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context.ExpectingValue = false;
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}
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public void Write(string str)
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{
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DoValidation(Condition.Value);
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PutNewline();
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if (str == null)
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{
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Put("null");
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}
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else
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{
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PutString(str);
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}
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context.ExpectingValue = false;
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}
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public void Write(ulong number)
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{
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DoValidation(Condition.Value);
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PutNewline();
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Put(Convert.ToString(number, number_format));
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context.ExpectingValue = false;
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}
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public void WriteArrayEnd()
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{
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DoValidation(Condition.InArray);
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PutNewline(false);
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ctx_stack.Pop();
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if (ctx_stack.Count == 1)
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{
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has_reached_end = true;
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}
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else
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{
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context = ctx_stack.Peek();
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context.ExpectingValue = false;
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}
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Unindent();
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Put("]");
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}
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public void WriteArrayStart()
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{
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DoValidation(Condition.NotAProperty);
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PutNewline();
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Put("[");
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context = new WriterContext();
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context.InArray = true;
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ctx_stack.Push(context);
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Indent();
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}
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public void WriteObjectEnd()
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{
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DoValidation(Condition.InObject);
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PutNewline(false);
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ctx_stack.Pop();
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if (ctx_stack.Count == 1)
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{
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has_reached_end = true;
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}
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else
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{
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context = ctx_stack.Peek();
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context.ExpectingValue = false;
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}
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Unindent();
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Put("}");
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}
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public void WriteObjectStart()
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{
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DoValidation(Condition.NotAProperty);
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PutNewline();
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Put("{");
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context = new WriterContext();
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context.InObject = true;
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ctx_stack.Push(context);
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Indent();
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}
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public void WritePropertyName(string property_name)
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{
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DoValidation(Condition.Property);
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PutNewline();
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PutString(property_name);
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if (pretty_print)
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{
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if (property_name.Length > context.Padding)
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{
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context.Padding = property_name.Length;
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}
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for (int num = context.Padding - property_name.Length; num >= 0; num--)
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{
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writer.Write(' ');
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}
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writer.Write(": ");
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}
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else
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{
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writer.Write(':');
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}
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context.ExpectingValue = true;
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}
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}
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}
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