/// <summary>Attempts to parse key values from the specified text.</summary>
/// <param name='text'>Text to parse (not null).</param>
/// <param name="allowNamedValues">Set to true if the parser should accept named values
/// so syntax like Name='value'. If this is false, the parsing will fail on such constructs.</param>
/// <param name="allowNull">Set to true if the parser should accept null values.
/// If set to false, the parser will fail on null values.</param>
/// <param name='instance'>After invocation, the parsed key instance.</param>
/// <returns>
/// true if the key instance was parsed; false if there was a
/// syntactic error.
/// </returns>
/// <remarks>
/// The returned instance contains only string values. To get typed values, a call to
/// <see cref="TryConvertValues"/> is necessary.
/// </remarks>
private static bool TryParseFromUri(string text, bool allowNamedValues, bool allowNull, out KeyInstance instance)
{
Debug.Assert(text != null, "text != null");
Dictionary<string, object> namedValues = null;
List<object> positionalValues = null;
ExpressionLexer lexer = new ExpressionLexer(text);
Token currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
instance = Empty;
return true;
}
instance = null;
do
{
if (currentToken.Id == TokenId.Identifier && allowNamedValues)
{
// Name-value pair.
if (positionalValues != null)
{
// We cannot mix named and non-named values.
return false;
}
string identifier = lexer.CurrentToken.GetIdentifier();
lexer.NextToken();
if (lexer.CurrentToken.Id != TokenId.Equal)
{
return false;
}
lexer.NextToken();
if (!lexer.CurrentToken.IsKeyValueToken)
{
return false;
}
string namedValue = lexer.CurrentToken.Text;
WebUtil.CreateIfNull(ref namedValues);
if (namedValues.ContainsKey(identifier))
{
// Duplicate name.
return false;
}
namedValues.Add(identifier, namedValue);
}
else if (currentToken.IsKeyValueToken || (allowNull && currentToken.Id == TokenId.NullLiteral))
{
// Positional value.
if (namedValues != null)
{
// We cannot mix named and non-named values.
return false;
}
WebUtil.CreateIfNull(ref positionalValues);
positionalValues.Add(lexer.CurrentToken.Text);
}
else
{
return false;
}
// Read the next token. We should be at the end, or find
// we have a comma followed by something.
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.Comma)
{
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
// Trailing comma.
return false;
}
}
}
while (currentToken.Id != TokenId.End);
instance = new KeyInstance(namedValues, positionalValues);
return true;
}
/// <summary>Handles typed literals.</summary>
/// <param name="targetType">Expected type to be parsed.</param>
/// <param name="targetTypeName">Expected type name.</param>
/// <param name="l">Lexer to use for reading tokens</param>
/// <returns>The constants expression produced by building the given literal.</returns>
private Expression ParseTypedLiteral(Type targetType, string targetTypeName, ExpressionLexer l)
{
object targetValue;
if (!WebConvert.TryKeyStringToPrimitive(l.CurrentToken.Text, targetType, out targetValue))
{
string message = Strings.RequestQueryParser_UnrecognizedLiteral(targetTypeName, l.CurrentToken.Text, l.CurrentToken.Position);
throw ParseError(message);
}
Expression result = this.CreateLiteral(targetValue, l.CurrentToken.Text);
l.NextToken();
return result;
}
private static List<List<string>> ReadExpandOrSelect(string value, bool select, IDataService dataService)
{
List<List<string>> list = new List<List<string>>();
List<string> list2 = null;
ExpressionLexer lexer = new ExpressionLexer(value);
while (lexer.CurrentToken.Id != TokenId.End)
{
string text;
bool flag = false;
if (select && (lexer.CurrentToken.Id == TokenId.Star))
{
text = lexer.CurrentToken.Text;
lexer.NextToken();
flag = true;
}
else if (select)
{
bool flag2;
text = lexer.ReadDottedIdentifier(true);
if (dataService.Provider.GetNameFromContainerQualifiedName(text, out flag2) == "*")
{
flag = true;
}
}
else
{
text = lexer.ReadDottedIdentifier(false);
}
if (list2 == null)
{
list2 = new List<string> {
};
}
list2.Add(text);
TokenId id = lexer.CurrentToken.Id;
if (id != TokenId.End)
{
if (flag || (id != TokenId.Slash))
{
lexer.ValidateToken(TokenId.Comma);
list2 = null;
}
lexer.NextToken();
}
}
return list;
}
/// <summary>Handles 'null' literals.</summary>
/// <param name="l">Lexer to use for reading tokens</param>
/// <returns>The parsed expression.</returns>
private static Expression ParseNullLiteral(ExpressionLexer l)
{
Debug.Assert(l.CurrentToken.Id == TokenId.NullLiteral, "l.CurrentToken.Id == TokenId.NullLiteral");
l.NextToken();
return WebUtil.NullLiteral;
}
private static bool TryParseFromUri(string text, bool allowNamedValues, bool allowNull, out KeyInstance instance)
{
Dictionary<string, object> dictionary = null;
List<object> list = null;
ExpressionLexer lexer = new ExpressionLexer(text);
Token currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
instance = Empty;
return true;
}
instance = null;
do
{
if ((currentToken.Id == TokenId.Identifier) && allowNamedValues)
{
if (list != null)
{
return false;
}
string identifier = lexer.CurrentToken.GetIdentifier();
lexer.NextToken();
if (lexer.CurrentToken.Id != TokenId.Equal)
{
return false;
}
lexer.NextToken();
if (!lexer.CurrentToken.IsKeyValueToken)
{
return false;
}
string str2 = lexer.CurrentToken.Text;
WebUtil.CreateIfNull<Dictionary<string, object>>(ref dictionary);
if (dictionary.ContainsKey(identifier))
{
return false;
}
dictionary.Add(identifier, str2);
}
else
{
if (!currentToken.IsKeyValueToken && (!allowNull || (currentToken.Id != TokenId.NullLiteral)))
{
return false;
}
if (dictionary != null)
{
return false;
}
WebUtil.CreateIfNull<List<object>>(ref list);
list.Add(lexer.CurrentToken.Text);
}
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.Comma)
{
lexer.NextToken();
currentToken = lexer.CurrentToken;
if (currentToken.Id == TokenId.End)
{
return false;
}
}
}
while (currentToken.Id != TokenId.End);
instance = new KeyInstance(dictionary, list);
return true;
}
