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using System.Text;
using System.Collections.Generic;
public class JsonFormatter
{
#region class members
const string Space = " ";
const int DefaultIndent = 0;
const string Indent = Space + Space + Space + Space;
static readonly string NewLine = "\n";
#endregion
static bool inDoubleString = false;
static bool inSingleString = false;
static bool inVariableAssignment = false;
static char prevChar = '\0';
static Stack<JsonContextType> context = new Stack<JsonContextType>();
private enum JsonContextType
{
Object, Array
}
static void BuildIndents(int indents, StringBuilder output)
{
indents += DefaultIndent;
for (; indents > 0; indents--)
output.Append(Indent);
}
static bool InString()
{
return inDoubleString || inSingleString;
}
public static string PrettyPrint(string input)
{
// Clear all states
inDoubleString = false;
inSingleString = false;
inVariableAssignment = false;
prevChar = '\0';
context.Clear();
var output = new StringBuilder(input.Length * 2);
char c;
for (int i = 0; i < input.Length; i++)
{
c = input[i];
switch (c)
{
case '[':
case '{':
if (!InString())
{
if (inVariableAssignment || (context.Count > 0 && context.Peek() != JsonContextType.Array))
{
output.Append(NewLine);
BuildIndents(context.Count, output);
}
output.Append(c);
context.Push(JsonContextType.Object);
output.Append(NewLine);
BuildIndents(context.Count, output);
}
else
output.Append(c);
break;
case ']':
case '}':
if (!InString())
{
output.Append(NewLine);
context.Pop();
BuildIndents(context.Count, output);
output.Append(c);
}
else
output.Append(c);
break;
case '=':
output.Append(c);
break;
case ',':
output.Append(c);
if (!InString())
{
BuildIndents(context.Count, output);
output.Append(NewLine);
BuildIndents(context.Count, output);
inVariableAssignment = false;
}
break;
case '\'':
if (!inDoubleString && prevChar != '\\')
inSingleString = !inSingleString;
output.Append(c);
break;
case ':':
if (!InString())
{
inVariableAssignment = true;
output.Append(Space);
output.Append(c);
output.Append(Space);
}
else
output.Append(c);
break;
case '"':
if (!inSingleString && prevChar != '\\')
inDoubleString = !inDoubleString;
output.Append(c);
break;
case ' ':
if (InString())
output.Append(c);
break;
default:
output.Append(c);
break;
}
prevChar = c;
}
return output.ToString();
}
}
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