287 lines
10 KiB
C#
287 lines
10 KiB
C#
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using System;
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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 FullSerializer {
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public static class fsJsonPrinter {
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/// <summary>
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/// Inserts the given number of indents into the builder.
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/// </summary>
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private static void InsertSpacing(TextWriter stream, int count) {
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for (int i = 0; i < count; ++i) {
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stream.Write(" ");
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}
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}
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/// <summary>
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/// Escapes a string.
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/// </summary>
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private static string EscapeString(string str) {
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// Escaping a string is pretty allocation heavy, so we try hard to not do it.
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bool needsEscape = false;
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for (int i = 0; i < str.Length; ++i) {
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char c = str[i];
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// unicode code point
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int intChar = Convert.ToInt32(c);
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if (intChar < 0 || intChar > 127) {
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needsEscape = true;
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break;
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}
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// standard escape character
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switch (c) {
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case '"':
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case '\\':
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case '\a':
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case '\b':
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case '\f':
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case '\n':
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case '\r':
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case '\t':
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case '\0':
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needsEscape = true;
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break;
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}
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if (needsEscape) {
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break;
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}
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}
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if (needsEscape == false) {
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return str;
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}
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StringBuilder result = new StringBuilder();
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for (int i = 0; i < str.Length; ++i) {
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char c = str[i];
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// unicode code point
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int intChar = Convert.ToInt32(c);
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if (intChar < 0 || intChar > 127) {
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result.Append(string.Format("\\u{0:x4} ", intChar).Trim());
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continue;
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}
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// standard escape character
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switch (c) {
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case '"': result.Append("\\\""); continue;
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case '\\': result.Append(@"\\"); continue;
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case '\a': result.Append(@"\a"); continue;
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case '\b': result.Append(@"\b"); continue;
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case '\f': result.Append(@"\f"); continue;
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case '\n': result.Append(@"\n"); continue;
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case '\r': result.Append(@"\r"); continue;
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case '\t': result.Append(@"\t"); continue;
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case '\0': result.Append(@"\0"); continue;
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}
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// no escaping needed
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result.Append(c);
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}
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return result.ToString();
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}
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private static void BuildCompressedString(fsData data, TextWriter stream) {
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switch (data.Type) {
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case fsDataType.Null:
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stream.Write("null");
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break;
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case fsDataType.Boolean:
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if (data.AsBool) stream.Write("true");
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else stream.Write("false");
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break;
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case fsDataType.Double:
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// doubles must *always* include a decimal
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stream.Write(ConvertDoubleToString(data.AsDouble));
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break;
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case fsDataType.Int64:
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stream.Write(data.AsInt64);
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break;
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case fsDataType.String:
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stream.Write('"');
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stream.Write(EscapeString(data.AsString));
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stream.Write('"');
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break;
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case fsDataType.Object: {
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stream.Write('{');
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bool comma = false;
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foreach (var entry in data.AsDictionary) {
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if (comma) stream.Write(',');
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comma = true;
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stream.Write('"');
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stream.Write(entry.Key);
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stream.Write('"');
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stream.Write(":");
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BuildCompressedString(entry.Value, stream);
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}
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stream.Write('}');
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break;
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}
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case fsDataType.Array: {
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stream.Write('[');
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bool comma = false;
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foreach (var entry in data.AsList) {
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if (comma) stream.Write(',');
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comma = true;
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BuildCompressedString(entry, stream);
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}
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stream.Write(']');
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break;
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}
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}
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}
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/// <summary>
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/// Formats this data into the given builder.
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/// </summary>
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private static void BuildPrettyString(fsData data, TextWriter stream, int depth) {
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switch (data.Type) {
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case fsDataType.Null:
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stream.Write("null");
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break;
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case fsDataType.Boolean:
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if (data.AsBool) stream.Write("true");
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else stream.Write("false");
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break;
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case fsDataType.Double:
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stream.Write(ConvertDoubleToString(data.AsDouble));
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break;
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case fsDataType.Int64:
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stream.Write(data.AsInt64);
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break;
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case fsDataType.String:
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stream.Write('"');
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stream.Write(EscapeString(data.AsString));
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stream.Write('"');
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break;
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case fsDataType.Object: {
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stream.Write('{');
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stream.WriteLine();
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bool comma = false;
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foreach (var entry in data.AsDictionary) {
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if (comma) {
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stream.Write(',');
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stream.WriteLine();
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}
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comma = true;
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InsertSpacing(stream, depth + 1);
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stream.Write('"');
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stream.Write(entry.Key);
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stream.Write('"');
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stream.Write(": ");
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BuildPrettyString(entry.Value, stream, depth + 1);
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}
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stream.WriteLine();
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InsertSpacing(stream, depth);
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stream.Write('}');
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break;
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}
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case fsDataType.Array:
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// special case for empty lists; we don't put an empty line between the brackets
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if (data.AsList.Count == 0) {
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stream.Write("[]");
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}
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else {
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bool comma = false;
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stream.Write('[');
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stream.WriteLine();
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foreach (var entry in data.AsList) {
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if (comma) {
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stream.Write(',');
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stream.WriteLine();
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}
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comma = true;
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InsertSpacing(stream, depth + 1);
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BuildPrettyString(entry, stream, depth + 1);
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}
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stream.WriteLine();
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InsertSpacing(stream, depth);
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stream.Write(']');
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}
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break;
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}
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}
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/// <summary>
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/// Writes the pretty JSON output data to the given stream.
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/// </summary>
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/// <param name="data">The data to print.</param>
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/// <param name="outputStream">Where to write the printed data.</param>
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public static void PrettyJson(fsData data, TextWriter outputStream) {
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BuildPrettyString(data, outputStream, 0);
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}
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/// <summary>
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/// Returns the data in a pretty printed JSON format.
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/// </summary>
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public static string PrettyJson(fsData data) {
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var sb = new StringBuilder();
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using (var writer = new StringWriter(sb)) {
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BuildPrettyString(data, writer, 0);
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return sb.ToString();
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}
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}
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/// <summary>
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/// Writes the compressed JSON output data to the given stream.
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/// </summary>
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/// <param name="data">The data to print.</param>
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/// <param name="outputStream">Where to write the printed data.</param>
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public static void CompressedJson(fsData data, StreamWriter outputStream) {
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BuildCompressedString(data, outputStream);
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}
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/// <summary>
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/// Returns the data in a relatively compressed JSON format.
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/// </summary>
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public static string CompressedJson(fsData data) {
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var sb = new StringBuilder();
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using (var writer = new StringWriter(sb)) {
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BuildCompressedString(data, writer);
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return sb.ToString();
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}
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}
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/// <summary>
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/// Utility method that converts a double to a string.
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/// </summary>
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private static string ConvertDoubleToString(double d) {
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if (Double.IsInfinity(d) || Double.IsNaN(d))
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return d.ToString(CultureInfo.InvariantCulture);
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string doubledString = d.ToString(CultureInfo.InvariantCulture);
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// NOTE/HACK: If we don't serialize with a period or an exponent,
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// then the number will be deserialized as an Int64, not a double.
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if (doubledString.Contains(".") == false &&
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doubledString.Contains("e") == false &&
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doubledString.Contains("E") == false) {
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doubledString += ".0";
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}
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return doubledString;
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}
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}
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}
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