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VdfDeserializer.cs
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VdfDeserializer.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;
using System.IO;
namespace NeXt.Vdf
{
/// <summary>
/// Base class for al Deserialization exceptions
/// </summary>
public class VdfDeserializationException : Exception
{
public VdfDeserializationException() : base() { }
public VdfDeserializationException(string message) : base() { }
public VdfDeserializationException(string message, Exception innerException) : base(message, innerException) { }
}
/// <summary>
/// A character was unexpected during deserialization
/// </summary>
public class UnexpectedCharacterException : VdfDeserializationException
{
public UnexpectedCharacterException(string message, char c) : base(message)
{
Character = c;
}
public char Character {get; private set;}
}
/// <summary>
/// Deserializes Vdf formatted text into a VdfValue
/// </summary>
public class VdfDeserializer
{
/// <summary>
/// Creates a VdfDeserializer object
/// </summary>
/// <param name="vdfText">the text to deserialize</param>
public VdfDeserializer(string vdfText)
{
VdfText = vdfText;
}
/// <summary>
/// Creates a vdfdeserializer object
/// </summary>
/// <param name="filePath">path to the file to deserialize</param>
/// <returns></returns>
public static VdfDeserializer FromFile(string filePath)
{
using (var reader = new StreamReader(filePath))
{
return new VdfDeserializer(reader.ReadToEnd());
}
}
private string VdfText;
private enum TokenType
{
String,
TableStart,
TableEnd,
Comment,
None,
}
private struct Token
{
public TokenType type;
public string content;
}
private enum CharacterType
{
Whitespace,
Newline,
SequenceDelimiter,
CommentDelimiter,
TableOpen,
TableClose,
EscapeChar,
Char,
}
private CharacterType GetCharType(char c)
{
switch(c)
{
case '\n': return CharacterType.Newline;
case '\r':
case '\t':
case ' ':
{
return CharacterType.Whitespace;
}
case '{': return CharacterType.TableOpen;
case '}': return CharacterType.TableClose;
case '\\': return CharacterType.EscapeChar;
case '/': return CharacterType.CommentDelimiter;
case '"': return CharacterType.SequenceDelimiter;
default: return CharacterType.Char;
}
}
/// <summary>
/// gets the character a single escape char represents
/// </summary>
/// <param name="c"></param>
/// <returns></returns>
private char GetUnescapedChar(char c)
{
switch(c)
{
case 'n': return '\n';
case 't': return '\t';
default: return c;
}
}
/// <summary>
/// returns the next full text (or as much as possible if incomplete)
/// </summary>
/// <param name="s">text to search in</param>
/// <param name="startindex">first index to look at</param>
/// <param name="endIndex">the index the returned string ended at</param>
/// <param name="fullStop">true if the string was over, false if it was incomplete</param>
/// <returns></returns>
private string GetTextToDelimiter(string s, int startindex, out int endIndex, out bool fullStop)
{
fullStop = true;
bool openEscape = false;
bool EscapedSequence = GetCharType(s[startindex]) == CharacterType.SequenceDelimiter;
StringBuilder sb = new StringBuilder();
for(int i = startindex; i < s.Length; i++)
{
switch(GetCharType(s[i]))
{
case CharacterType.SequenceDelimiter:
{
if(!openEscape && EscapedSequence && i > startindex)
{
endIndex = i + 1;
return sb.ToString();
}
else if(!EscapedSequence)
{
throw new UnexpectedCharacterException("Non-Escape sequences cannot contain sequence delimiters", s[i]);
}
else if(openEscape)
{
sb.Append(GetUnescapedChar(s[i]));
openEscape = false;
}
break;
}
case CharacterType.Whitespace:
{
if(EscapedSequence)
{
sb.Append(s[i]);
}
else
{
endIndex = i;
return sb.ToString();
}
break;
}
case CharacterType.EscapeChar:
{
if(openEscape)
{
sb.Append(GetUnescapedChar(s[i]));
}
openEscape = !openEscape;
break;
}
default:
{
if(openEscape)
{
sb.Append(GetUnescapedChar(s[i]));
openEscape = false;
}
else
{
sb.Append(s[i]);
}
break;
}
}
}
endIndex = s.Length;
if(EscapedSequence)
{
if((GetCharType(s[s.Length-1]) != CharacterType.SequenceDelimiter))
{
fullStop = false;
}
else
{
int c = 0;
for (int i = s.Length - 2; i >= 0 && GetCharType(s[i]) == CharacterType.EscapeChar; i--)
{
c++;
}
fullStop = (c % 2) == 0;
}
}
return sb.ToString();
}
private Token startedToken;
private bool unclosedLine = false;
private void HandleUnclosedLine(Action<Token> callback, string line)
{
int endindex;
bool isEnd;
string text = GetTextToDelimiter("\""+line, 0, out endindex, out isEnd);
if (!isEnd)
{
startedToken.content += text;
unclosedLine = true;
}
else
{
unclosedLine = false;
callback(startedToken);
if (endindex < line.Length)
{
HandleLine(callback, line.Substring(endindex).Trim());
}
}
}
private void HandleLine(Action<Token> callback, string line)
{
if(string.IsNullOrEmpty(line))
{
return;
}
CharacterType ct = GetCharType(line[0]);
switch(ct)
{
case CharacterType.TableOpen:
{
callback(new Token(){type=TokenType.TableStart, content=line[0].ToString() });
break;
}
case CharacterType.TableClose:
{
callback(new Token(){type=TokenType.TableEnd, content=line[0].ToString() });
break;
}
case CharacterType.CommentDelimiter:
{
if(line.Length < 2 || GetCharType(line[1]) != CharacterType.CommentDelimiter)
{
throw new UnexpectedCharacterException("Single comment delimiter is not allowed", line[0]);
}
callback(new Token(){type=TokenType.Comment, content=line });
break;
}
default:
{
int endindex;
bool isEnd;
string text = GetTextToDelimiter(line, 0, out endindex, out isEnd);
if(!isEnd)
{
startedToken = new Token() { type = TokenType.String, content = text };
unclosedLine = true;
}
else
{
callback(new Token() { type = TokenType.String, content = text });
if (endindex < line.Length)
{
HandleLine(callback, line.Substring(endindex).Trim());
}
}
break;
}
}
}
/// <summary>
/// Tokenizes the VdfFormatted string into a list of tokens
/// </summary>
/// <param name="s">the string to tokenize</param>
/// <returns>the token list</returns>
private List<Token> Tokenize(string s)
{
var result = new List<Token>();
var lines = s.Split('\n').Select((v) => v.Trim());
foreach(var line in lines)
{
if(unclosedLine)
{
HandleUnclosedLine(result.Add, line);
}
else
{
HandleLine(result.Add, line);
}
}
return result;
}
/// <summary>
/// Deserializes the Vdf string into a VdfValue
/// </summary>
/// <returns></returns>
public VdfValue Deserialize()
{
if(VdfText== null)
{
throw new ArgumentNullException("s");
}
if(VdfText.Length < 1)
{
throw new ArgumentException("s cannot be empty ", "s");
}
var tokens = Tokenize(VdfText);
if(tokens.Count < 1)
{
throw new ArgumentException("no tokens found in string", "s");
}
VdfValue root = null;
VdfTable current = null;
var comments = new List<string>();
string name = null;
foreach(var token in tokens)
{
if(token.type == TokenType.Comment)
{
comments.Add(token.content.Substring(2));
continue;
}
if(root == null)
{
if (token.type == TokenType.String)
{
if(name != null)
{
return new VdfString(name, token.content);
}
name = token.content;
}
else if (token.type == TokenType.TableStart)
{
root = new VdfTable(name);
if(comments.Count > 0)
{
foreach(var comment in comments)
{
root.Comments.Add(comment);
}
comments.Clear();
}
current = root as VdfTable;
name = null;
}
else
{
throw new VdfDeserializationException("Invalid format: First token was not a string");
}
continue;
}
if(name != null)
{
VdfValue v;
if(token.type == TokenType.String)
{
int i;
double d;
if(int.TryParse(token.content, NumberStyles.Integer, CultureInfo.InvariantCulture, out i))
{
v = new VdfInteger(name, i);
}
else if(double.TryParse(token.content, NumberStyles.Number, CultureInfo.InvariantCulture, out d))
{
v = new VdfDouble(name, d);
}
else
{
v = new VdfString(name, token.content);
}
if (comments.Count > 0)
{
foreach (var comment in comments)
{
v.Comments.Add(comment);
}
comments.Clear();
}
name = null;
current.Add(v);
}
else if (token.type == TokenType.TableStart)
{
v = new VdfTable(name);
if (comments.Count > 0)
{
foreach (var comment in comments)
{
v.Comments.Add(comment);
}
comments.Clear();
}
current.Add(v);
name = null;
current = v as VdfTable;
}
}
else
{
if(token.type == TokenType.String)
{
name = token.content;
}
else if(token.type == TokenType.TableEnd)
{
current = current.Parent as VdfTable;
}
else
{
throw new VdfDeserializationException("Invalid Format: a name was needed but not found");
}
}
}
if(current != null)
{
throw new VdfDeserializationException("Invalid format: unclosed table");
}
return root;
}
}
}