using System.Collections.Generic; using System.Text; namespace fastJSON { internal static class Formatter { public static string Indent = " "; public static void AppendIndent(StringBuilder sb, int count) { for (; count > 0; --count) sb.Append(Indent); } public static bool IsEscaped(StringBuilder sb, int index) { bool escaped = false; while (index > 0 && sb[--index] == '\\') escaped = !escaped; return escaped; } public static string PrettyPrint(string input) { var output = new StringBuilder(input.Length * 2); char? quote = null; int depth = 0; for (int i = 0; i < input.Length; ++i) { char ch = input[i]; switch (ch) { case '{': case '[': output.Append(ch); if (!quote.HasValue) { output.AppendLine(); AppendIndent(output, ++depth); } break; case '}': case ']': if (quote.HasValue) output.Append(ch); else { output.AppendLine(); AppendIndent(output, --depth); output.Append(ch); } break; case '"': case '\'': output.Append(ch); if (quote.HasValue) { if (!IsEscaped(output, i)) quote = null; } else quote = ch; break; case ',': output.Append(ch); if (!quote.HasValue) { output.AppendLine(); AppendIndent(output, depth); } break; case ':': if (quote.HasValue) output.Append(ch); else output.Append(" : "); break; default: if (quote.HasValue || !char.IsWhiteSpace(ch)) output.Append(ch); break; } } return output.ToString(); } } }
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