private static DynValue ParseJsonValue(Lexer L, Script script)
{
if (L.Current.Type == TokenType.Brk_Open_Curly)
{
Table t = ParseJsonObject(L, script);
return DynValue.NewTable(t);
}
else if (L.Current.Type == TokenType.Brk_Open_Square)
{
Table t = ParseJsonArray(L, script);
return DynValue.NewTable(t);
}
else if (L.Current.Type == TokenType.String)
{
return DynValue.NewString(L.Current.Text);
}
else if (L.Current.Type == TokenType.Number)
{
return DynValue.NewNumber(L.Current.GetNumberValue()).AsReadOnly();
}
else if (L.Current.Type == TokenType.True)
{
return DynValue.True;
}
else if (L.Current.Type == TokenType.False)
{
return DynValue.False;
}
else if (L.Current.Type == TokenType.Name && L.Current.Text == "null")
{
return JsonNull.Create();
}
else
{
throw new SyntaxErrorException(L.Current, "Unexpected token : '{0}'", L.Current.Text);
}
}
private static Table ParseJsonObject(Lexer L, Script script)
{
Table t = new Table(script);
L.Next();
while (L.Current.Type != TokenType.Brk_Close_Curly)
{
AssertToken(L, TokenType.String);
string key = L.Current.Text;
L.Next();
AssertToken(L, TokenType.Colon);
L.Next();
DynValue v = ParseJsonValue(L, script);
t.Set(key, v);
L.Next();
if (L.Current.Type == TokenType.Comma)
L.Next();
}
return t;
}
private static void AssertToken(Lexer L, TokenType type)
{
if (L.Current.Type != type)
throw new SyntaxErrorException(L.Current, "Unexpected token : '{0}'", L.Current.Text);
}
private static Table ParseJsonArray(Lexer L, Script script)
{
Table t = new Table(script);
L.Next();
while (L.Current.Type != TokenType.Brk_Close_Square)
{
DynValue v = ParseJsonValue(L, script);
t.Append(v);
L.Next();
if (L.Current.Type == TokenType.Comma)
L.Next();
}
return t;
}
/// <summary>
/// Converts a json string to a table
/// </summary>
/// <param name="json">The json.</param>
/// <param name="script">The script to which the table is assigned (null for prime tables).</param>
/// <returns>A table containing the representation of the given json.</returns>
public static Table JsonToTable(string json, Script script = null)
{
Lexer L = new Lexer(0, json, false);
if (L.Current.Type == TokenType.Brk_Open_Curly)
return ParseJsonObject(L, script);
else if (L.Current.Type == TokenType.Brk_Open_Square)
return ParseJsonArray(L, script);
else
throw new SyntaxErrorException(L.Current, "Unexpected token : '{0}'", L.Current.Text);
}
