JSONWriter.cs
255 lines
| 7.9 KiB
| text/x-csharp
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r55 | 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; | ||||
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r72 | readonly bool m_indent = true; | ||
| readonly int m_indentSize = 4; | ||||
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r55 | |||
| 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; | ||||
| } | ||||
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r72 | public JSONWriter(TextWriter writer, bool indent) { | ||
| Safe.ArgumentNotNull(writer, "writer"); | ||||
| m_writer = writer; | ||||
| m_indent = indent; | ||||
| } | ||||
| void WriteIndent() { | ||||
| if (m_indent) { | ||||
| var indent = new char[m_contextStack.Count * m_indentSize + 1]; | ||||
| indent[0] = '\n'; | ||||
| for (int i = 1; i < indent.Length; i++) | ||||
| indent[i] = ' '; | ||||
| m_writer.Write(new String(indent)); | ||||
| } else { | ||||
| m_writer.Write(' '); | ||||
| } | ||||
| } | ||||
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r55 | void WriteMemberName(string name) { | ||
| Safe.ArgumentNotEmpty(name, "name"); | ||||
| if (m_context.element != JSONElementContext.Object) | ||||
| OperationNotApplicable("WriteMember"); | ||||
| if (m_context.needComma) | ||||
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r72 | m_writer.Write(","); | ||
| WriteIndent(); | ||||
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r55 | 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) | ||||
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r72 | m_writer.Write(","); | ||
| WriteIndent(); | ||||
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r55 | m_context.needComma = true; | ||
| Write(value); | ||||
| } | ||||
| public void WriteValue(bool value) { | ||||
| if (m_context.element != JSONElementContext.Array) | ||||
| OperationNotApplicable("WriteValue"); | ||||
| if (m_context.needComma) | ||||
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r72 | m_writer.Write(","); | ||
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r55 | m_context.needComma = true; | ||
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r72 | WriteIndent(); | ||
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r55 | Write(value); | ||
| } | ||||
| public void WriteValue(double value) { | ||||
| if (m_context.element != JSONElementContext.Array) | ||||
| OperationNotApplicable("WriteValue"); | ||||
| if (m_context.needComma) | ||||
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r72 | m_writer.Write(","); | ||
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r55 | m_context.needComma = true; | ||
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r72 | WriteIndent(); | ||
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r55 | Write(value); | ||
| } | ||||
| public void BeginObject() { | ||||
| if (m_context.element != JSONElementContext.None && m_context.element != JSONElementContext.Array) | ||||
| OperationNotApplicable("BeginObject"); | ||||
| if (m_context.needComma) | ||||
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r72 | m_writer.Write(","); | ||
| WriteIndent(); | ||||
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r55 | m_context.needComma = true; | ||
| m_contextStack.Push(m_context); | ||||
| m_context = new Context { element = JSONElementContext.Object, needComma = false }; | ||||
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r72 | m_writer.Write("{"); | ||
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r55 | } | ||
| public void BeginObject(string name) { | ||||
| WriteMemberName(name); | ||||
| m_contextStack.Push(m_context); | ||||
| m_context = new Context { element = JSONElementContext.Object, needComma = false }; | ||||
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r72 | m_writer.Write("{"); | ||
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r55 | } | ||
| public void EndObject() { | ||||
| if (m_context.element != JSONElementContext.Object) | ||||
| OperationNotApplicable("EndArray"); | ||||
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r72 | |||
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r55 | m_context = m_contextStack.Pop(); | ||
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r72 | WriteIndent(); | ||
| m_writer.Write("}"); | ||||
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r55 | } | ||
| public void BeginArray() { | ||||
| if (m_context.element != JSONElementContext.None && m_context.element != JSONElementContext.Array) | ||||
| throw new InvalidOperationException(); | ||||
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r72 | if (m_context.needComma) { | ||
| m_writer.Write(","); | ||||
| } | ||||
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r55 | m_context.needComma = true; | ||
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r72 | WriteIndent(); | ||
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r55 | m_contextStack.Push(m_context); | ||
| m_context = new Context { element = JSONElementContext.Array, needComma = false }; | ||||
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r72 | m_writer.Write("["); | ||
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r55 | } | ||
| public void BeginArray(string name) { | ||||
| WriteMemberName(name); | ||||
| m_contextStack.Push(m_context); | ||||
| m_context = new Context { element = JSONElementContext.Array, needComma = false }; | ||||
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r72 | m_writer.Write("["); | ||
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r55 | } | ||
| public void EndArray() { | ||||
| if (m_context.element != JSONElementContext.Array) | ||||
| OperationNotApplicable("EndArray"); | ||||
| m_context = m_contextStack.Pop(); | ||||
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r72 | WriteIndent(); | ||
| m_writer.Write("]"); | ||||
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r55 | } | ||
| void Write(bool value) { | ||||
| m_writer.Write(value ? "true" : "false"); | ||||
| } | ||||
| void Write(string value) { | ||||
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r115 | if (value == null) { | ||
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r55 | m_writer.Write("null"); | ||
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r115 | return; | ||
| } | ||||
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r55 | |||
| 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(_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 )); | ||||
| } | ||||
| } | ||||
| } | ||||