Mercurial > pub > ImplabNet
view Implab/JSON/JSONWriter.cs @ 69:48763f3b5db8
service locator refactoring
author | cin |
---|---|
date | Thu, 28 Aug 2014 19:38:39 +0400 |
parents | c0bf853aa04f |
children | d67b95eddaf4 |
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using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Implab.JSON { public class JSONWriter { struct Context { public bool needComma; public JSONElementContext element; } Stack<Context> m_contextStack = new Stack<Context>(); Context m_context; TextWriter m_writer; bool m_indent; static readonly char [] _escapeBKS, _escapeFWD, _escapeCR, _escapeNL, _escapeTAB, _escapeSLASH, _escapeBSLASH, _escapeQ; static JSONWriter() { _escapeBKS = "\\b".ToCharArray(); _escapeFWD = "\\f".ToCharArray(); _escapeCR = "\\r".ToCharArray(); _escapeNL = "\\n".ToCharArray(); _escapeTAB = "\\t".ToCharArray(); _escapeBSLASH = "\\\\".ToCharArray(); _escapeSLASH = "\\/".ToCharArray(); _escapeQ = "\\\"".ToCharArray(); } public JSONWriter(TextWriter writer) { Safe.ArgumentNotNull(writer, "writer"); m_writer = writer; } void WriteMemberName(string name) { Safe.ArgumentNotEmpty(name, "name"); if (m_context.element != JSONElementContext.Object) OperationNotApplicable("WriteMember"); if (m_context.needComma) m_writer.Write(", "); // TODO indent m_context.needComma = true; Write(name); m_writer.Write(" : "); } public void WriteValue(string name, string value) { WriteMemberName(name); Write(value); } public void WriteValue(string name, bool value) { WriteMemberName(name); Write(value); } public void WriteValue(string name, double value) { WriteMemberName(name); Write(value); } public void WriteValue(string value) { if (m_context.element != JSONElementContext.Array) OperationNotApplicable("WriteValue"); if (m_context.needComma) m_writer.Write(", "); m_context.needComma = true; Write(value); } public void WriteValue(bool value) { if (m_context.element != JSONElementContext.Array) OperationNotApplicable("WriteValue"); if (m_context.needComma) m_writer.Write(", "); m_context.needComma = true; Write(value); } public void WriteValue(double value) { if (m_context.element != JSONElementContext.Array) OperationNotApplicable("WriteValue"); if (m_context.needComma) m_writer.Write(", "); m_context.needComma = true; Write(value); } public void BeginObject() { if (m_context.element != JSONElementContext.None && m_context.element != JSONElementContext.Array) OperationNotApplicable("BeginObject"); if (m_context.needComma) m_writer.Write(", "); m_context.needComma = true; m_contextStack.Push(m_context); m_context = new Context { element = JSONElementContext.Object, needComma = false }; m_writer.Write("{ "); } public void BeginObject(string name) { WriteMemberName(name); m_contextStack.Push(m_context); m_context = new Context { element = JSONElementContext.Object, needComma = false }; m_writer.Write("{ "); } public void EndObject() { if (m_context.element != JSONElementContext.Object) OperationNotApplicable("EndArray"); m_writer.Write(" }"); m_context = m_contextStack.Pop(); } public void BeginArray() { if (m_context.element != JSONElementContext.None && m_context.element != JSONElementContext.Array) throw new InvalidOperationException(); if (m_context.needComma) m_writer.Write(", "); m_context.needComma = true; m_contextStack.Push(m_context); m_context = new Context { element = JSONElementContext.Array, needComma = false }; m_writer.Write("[ "); } public void BeginArray(string name) { WriteMemberName(name); m_contextStack.Push(m_context); m_context = new Context { element = JSONElementContext.Array, needComma = false }; m_writer.Write("[ "); } public void EndArray() { if (m_context.element != JSONElementContext.Array) OperationNotApplicable("EndArray"); m_writer.Write(" ]"); m_context = m_contextStack.Pop(); } void Write(bool value) { m_writer.Write(value ? "true" : "false"); } void Write(string value) { if (value == null) m_writer.Write("null"); var chars = value.ToCharArray(); m_writer.Write('"'); for (int i = 0; i < chars.Length; i++) { var ch = chars[i]; switch (ch) { case '\b': m_writer.Write(_escapeBKS); break; case '\f': m_writer.Write(_escapeFWD); break; case '\r': m_writer.Write(_escapeCR); break; case '\n': m_writer.Write(_escapeNL); break; case '\t': m_writer.Write(_escapeTAB); break; case '\\': m_writer.Write(_escapeBSLASH); break; case '/': m_writer.Write(_escapeSLASH); break; case '"': m_writer.Write(_escapeQ); break; default: if (ch < 0x20) { m_writer.Write("\\u00{0:x2}",(int)ch); } else { m_writer.Write(ch); } break; } } m_writer.Write('"'); } void Write(double value) { m_writer.Write(value); } void OperationNotApplicable(string opName) { throw new InvalidOperationException(String.Format("The operation '{0}' isn't applicable in the context of '{1}'", opName, m_context.element )); } } }