##// END OF EJS Templates
implab » ImplabNet
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fixed promise chaining behavior, the error handler doesn't handle result or cancellation handlers exceptions these exceptions are propagated to the next handlers.
fixed promise chaining behavior, the error handler doesn't handle result or cancellation handlers exceptions these exceptions are propagated to the next handlers.
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r180:c32688129f14 ref20160224
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JSONWriter.cs
319 lines | 10.4 KiB | text/x-csharp | CSharpLexer
/ Implab / Formats / JSON / JSONWriter.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Globalization;
using System.Diagnostics;
namespace Implab.Formats.JSON {
public class JSONWriter {
struct Context {
public bool needComma;
public JSONElementContext element;
}
Stack<Context> m_contextStack = new Stack<Context>();
Context m_context;
const int BUFFER_SIZE = 64;
TextWriter m_writer;
readonly bool m_indent = true;
readonly int m_indentSize = 4;
readonly char[] m_buffer = new char[BUFFER_SIZE];
int m_bufferPos;
static readonly char [] _hex = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
static readonly char [] _escapeBKS,
_escapeFWD,
_escapeCR,
_escapeNL,
_escapeTAB,
_escapeBSLASH,
_escapeQ;
static JSONWriter() {
_escapeBKS = "\\b".ToCharArray();
_escapeFWD = "\\f".ToCharArray();
_escapeCR = "\\r".ToCharArray();
_escapeNL = "\\n".ToCharArray();
_escapeTAB = "\\t".ToCharArray();
_escapeBSLASH = "\\\\".ToCharArray();
_escapeQ = "\\\"".ToCharArray();
}
public JSONWriter(TextWriter writer) {
Safe.ArgumentNotNull(writer, "writer");
m_writer = writer;
}
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(' ');
}
}
void WriteMemberName(string name) {
Safe.ArgumentNotEmpty(name, "name");
if (m_context.element != JSONElementContext.Object)
OperationNotApplicable("WriteMember");
if (m_context.needComma)
m_writer.Write(",");
WriteIndent();
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) {
if (m_context.needComma)
m_writer.Write(",");
WriteIndent();
m_context.needComma = true;
Write(value);
} else if (m_context.element == JSONElementContext.None) {
Write(value);
m_context.element = JSONElementContext.Closed;
} else {
OperationNotApplicable("WriteValue");
}
}
public void WriteValue(bool value) {
if (m_context.element == JSONElementContext.Array) {
if (m_context.needComma)
m_writer.Write(",");
WriteIndent();
m_context.needComma = true;
Write(value);
} else if (m_context.element == JSONElementContext.None) {
Write(value);
m_context.element = JSONElementContext.Closed;
} else {
OperationNotApplicable("WriteValue");
}
}
public void WriteValue(double value) {
if (m_context.element == JSONElementContext.Array) {
if (m_context.needComma)
m_writer.Write(",");
WriteIndent();
m_context.needComma = true;
Write(value);
} else if (m_context.element == JSONElementContext.None) {
Write(value);
m_context.element = JSONElementContext.Closed;
} else {
OperationNotApplicable("WriteValue");
}
}
public void BeginObject() {
if (m_context.element != JSONElementContext.None && m_context.element != JSONElementContext.Array)
OperationNotApplicable("BeginObject");
if (m_context.needComma)
m_writer.Write(",");
WriteIndent();
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("EndObject");
m_context = m_contextStack.Pop();
if (m_contextStack.Count == 0)
m_context.element = JSONElementContext.Closed;
WriteIndent();
m_writer.Write("}");
}
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;
WriteIndent();
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_context = m_contextStack.Pop();
if (m_contextStack.Count == 0)
m_context.element = JSONElementContext.Closed;
WriteIndent();
m_writer.Write("]");
}
void Write(bool value) {
m_writer.Write(value ? "true" : "false");
}
void FlushBuffer() {
if (m_bufferPos > 0) {
m_writer.Write(m_buffer, 0, m_bufferPos);
m_bufferPos = 0;
}
}
void Write(string value) {
if (value == null) {
m_writer.Write("null");
return;
}
Debug.Assert(m_bufferPos == 0);
var chars = value.ToCharArray();
m_buffer[m_bufferPos++] = '"';
// Analysis disable once ForCanBeConvertedToForeach
for (int i = 0; i < chars.Length; i++) {
var ch = chars[i];
char[] escapeSeq;
switch (ch) {
case '\b':
escapeSeq = _escapeBKS;
break;
case '\f':
escapeSeq = _escapeFWD;
break;
case '\r':
escapeSeq = _escapeCR;
break;
case '\n':
escapeSeq = _escapeNL;
break;
case '\t':
escapeSeq = _escapeTAB;
break;
case '\\':
escapeSeq = _escapeBSLASH;
break;
case '"':
escapeSeq = _escapeQ;
break;
default:
if (ch < 0x20) {
if (m_bufferPos + 6 > BUFFER_SIZE)
FlushBuffer();
m_buffer[m_bufferPos++] = '\\';
m_buffer[m_bufferPos++] = 'u';
m_buffer[m_bufferPos++] = '0';
m_buffer[m_bufferPos++] = '0';
m_buffer[m_bufferPos++] = _hex[ch >> 4 & 0xf];
m_buffer[m_bufferPos++] = _hex[ch & 0xf];
} else {
if (m_bufferPos >= BUFFER_SIZE)
FlushBuffer();
m_buffer[m_bufferPos++] = ch;
}
continue;
}
if (m_bufferPos + escapeSeq.Length > BUFFER_SIZE)
FlushBuffer();
Array.Copy(escapeSeq, 0, m_buffer, m_bufferPos, escapeSeq.Length);
m_bufferPos += escapeSeq.Length;
}
if (m_bufferPos >= BUFFER_SIZE)
FlushBuffer();
m_buffer[m_bufferPos++] = '"';
FlushBuffer();
}
void Write(double value) {
if (double.IsNaN(value))
Write("NaN");
else if (double.IsNegativeInfinity(value))
Write("-Infinity");
else if (double.IsPositiveInfinity(value))
Write("Infinity");
else
m_writer.Write(value.ToString(CultureInfo.InvariantCulture));
}
void OperationNotApplicable(string opName) {
throw new InvalidOperationException(String.Format("The operation '{0}' isn't applicable in the context of '{1}'", opName, m_context.element ));
}
}
}