/// <summary>
/// Checks whether there is the tag at the specified position
/// in the specified sql.
/// </summary>
/// <name>The value of the Name property.</name>
/// <returns>
/// The position after the tag or -1 there is no tag at the position.
/// </returns>
internal static int MatchStart(string firstWord, string secondWord, string sql, int position)
{
#region Check the arguments
SqlStringParserBase.CheckTextAndPositionArguments(sql, position);
#endregion
if (string.Compare(sql, position, firstWord, 0, firstWord.Length, true) != 0)
{
return(-1);
}
position += firstWord.Length;
SqlStringParserBase.SkipWhiteSpace(sql, ref position);
if (position == sql.Length)
{
return(-1);
}
if (string.Compare(sql, position, secondWord, 0, secondWord.Length, true) != 0)
{
return(-1);
}
return(position + secondWord.Length);
}
/// <summary>
/// Returns a value indicating whether there is the tag ending at the specified position.
/// </summary>
/// <returns>
/// If this value is less than zero, then there is no ending; otherwise the
/// position after ending is returned.
/// </returns>
public override int MatchEnd(string sql, int position)
{
CheckInitialized();
#region Check the arguments
SqlStringParserBase.CheckTextAndPositionArguments(sql, position);
#endregion
if (ParentTag != null && ParentTag.MatchEnd(sql, position) >= 0)
{
return(position);
}
Type myTag = (Parser as SqlStringParser).IsTag(sql, position);
if (
myTag != null &&
!myTag.IsAssignableFrom(typeof(StringLiteralTag)) &&
!myTag.IsAssignableFrom(typeof(BracesTag))
)
{
return(position);
}
return(-1);
}
/// <summary>
/// Returns a value indicating whether there is the tag ending at the specified position.
/// </summary>
/// <returns>
/// If this value is less than zero, then there is no ending; otherwise the
/// position after ending is returned.
/// </returns>
private int MatchEnd(string sql, int position, int literalStartPos)
{
#region Check the arguments
SqlStringParserBase.CheckTextAndPositionArguments(sql, position);
#endregion
if (string.Compare(sql, position, cTagDelimiter, 0, cTagDelimiter.Length, true) != 0)
{
return(-1);
}
#region Check the next and previous symbols (where there are ' symbols)
#region Determine the number of ' symbols before
int myNumberOfApostBefore = 0;
for (int myCurPos = position - 1; myCurPos >= literalStartPos; myCurPos--)
{
if (string.Compare(sql, myCurPos, cTagDelimiter, 0, cTagDelimiter.Length, true) == 0)
{
myNumberOfApostBefore++;
}
else
{
break;
}
}
#endregion
if (!(myNumberOfApostBefore == 1 && position == literalStartPos + 1))
{
if (myNumberOfApostBefore % 2 == 1)
{
return(-1);
}
#region Check whether the next symbol is '
if (position + 1 < sql.Length)
{
if (string.Compare(sql, position + 1, cTagDelimiter, 0, cTagDelimiter.Length, true) == 0)
{
return(-1);
}
}
#endregion
}
#endregion
return(position + cTagDelimiter.Length);
}
/// <summary>
/// Reads the tag from the specified data.
/// </summary>
protected virtual void InitializeFromDataCore(SqlStringParserBase parser, string value, bool hasContents)
{
Parser = parser;
Value = value;
HasContents = hasContents;
IsInitialized = true;
}
/// <summary>
/// Returns a value indicating whether there is the tag ending at the specified position. ///
/// </summary>
/// <returns>
/// If this value is less than zero, then there is no ending; otherwise the
/// position after ending is returned.
/// </returns>
public override int MatchEnd(string sql, int position)
{
CheckInitialized();
#region Check the arguments
SqlStringParserBase.CheckTextAndPositionArguments(sql, position);
#endregion
return(MatchEndStatic(sql, position));
}
/// <summary>
/// Reads the tag at the specified position in the specified sql string.
/// </summary>
/// <returns>
/// The position after the tag (at which to continue reading).
/// </returns>
protected override int InitializeCoreFromText(SqlStringParserBase parser, string sql, int position, TagBase parentTag)
{
#region Check the arguments
SqlStringParserBase.CheckTextAndPositionArguments(sql, position);
#endregion
int myLiteralStartPos = position;
position = MatchStartStatic(sql, position);
if (position < 0)
{
throw new Exception("Cannot read the StringLiteral tag.");
}
#region Read the literal value
int myResult = -1;
int myValueStartPos = position;
while (position < sql.Length)
{
myResult = MatchEnd(sql, position, myLiteralStartPos);
if (myResult >= 0)
{
if (position == myValueStartPos)
{
Value = string.Empty;
}
else
{
Value = sql.Substring(myValueStartPos, position - myValueStartPos);
}
break;
}
position++;
}
if (myResult < 0)
{
throw new Exception("Cannot read the StringLiteral tag.");
}
#endregion
Parser = parser;
HasContents = false;
return(myResult);
}
/// <summary>
/// Checks whether there is the tag start at the specified position
/// in the specified sql.
/// </summary>
/// <returns>
/// The position after the tag or -1 there is no tag start at the position.
/// </returns>
public static int MatchStartStatic(string sql, int position)
{
#region Check the arguments
SqlStringParserBase.CheckTextAndPositionArguments(sql, position);
#endregion
if (string.Compare(sql, position, cTagDelimiter, 0, cTagDelimiter.Length, true) != 0)
{
return(-1);
}
return(position + cTagDelimiter.Length);
}
/// <summary>
/// Reads the tag from the specified data.
/// </summary>
public void InitializeFromData(SqlStringParserBase parser, string value, bool hasContents)
{
#region Check the arguments
if (parser == null)
{
throw new ArgumentNullException("parser");
}
#endregion
InitializeFromDataCore(parser, value, hasContents);
IsInitialized = true;
}
/// <summary>
/// Reads the tag at the specified position in the specified word and separator array.
/// </summary>
/// <param name="parentTag">
/// The parent tag of this tag. This argument is used to determine
/// the end of the tag (it can be the end of the parent tag).
/// </param>
/// <returns>
/// The position after the tag (at which to continue reading).
/// </returns>
public int InitializeFromText(SqlStringParserBase parser, string text, int position, TagBase parentTag)
{
#region Check the arguments
if (parser == null)
{
throw new ArgumentNullException("parser");
}
#endregion
int myResult = InitializeCoreFromText(parser, text, position, parentTag);
IsInitialized = true;
return(myResult);
}
/// <summary>
/// Checks whether there is the tag at the specified position
/// in the specified sql.
/// </summary>
/// <name>The value of the Name property.</name>
/// <returns>
/// The position after the tag or -1 there is no tag at the position.
/// </returns>
internal static int MatchStart(string name, string sql, int position)
{
#region Check the arguments
if (name == null)
{
throw new ArgumentNullException("name");
}
SqlStringParserBase.CheckTextAndPositionArguments(sql, position);
#endregion
if (string.Compare(sql, position, name, 0, name.Length, true) != 0)
{
return(-1);
}
return(position + name.Length);
}
/// <summary>
/// Reads the tag at the specified position in the specified word and separator array.
/// </summary>
/// <returns>
/// The position after the tag (at which to continue reading).
/// </returns>
protected override int InitializeCoreFromText(SqlStringParserBase parser, string sql, int position, TagBase parentTag)
{
#region Check the arguments
SqlStringParserBase.CheckTextAndPositionArguments(sql, position);
#endregion
int myResult = MatchStartStatic(sql, position);
if (myResult < 0)
{
throw new Exception("Cannot read the Braces tag.");
}
Parser = parser;
HasContents = true;
return(myResult);
}
/// <summary>
/// Reads the tag at the specified position in the specified word and separator array.
/// </summary>
/// <returns>
/// The position after the tag (at which to continue reading).
/// </returns>
protected override int InitializeCoreFromText(SqlStringParserBase parser, string sql, int position, TagBase parentTag)
{
#region Check the arguments
SqlStringParserBase.CheckTextAndPositionArguments(sql, position);
#endregion
int myAfterTagStartPos = MatchStartStatic(sql, position);
if (myAfterTagStartPos < 0)
{
throw new Exception("Cannot read the QuotedIdentifier tag.");
}
#region Read the identifier's value
int myTagEndPos = sql.IndexOf(cTagDelimiter, myAfterTagStartPos, StringComparison.InvariantCultureIgnoreCase);
if (myTagEndPos < 0)
{
throw new Exception("Cannot read the QuotedIdentifier tag.");
}
if (myAfterTagStartPos == myTagEndPos)
{
Value = string.Empty;
}
else
{
Value = sql.Substring(myAfterTagStartPos, myTagEndPos - myAfterTagStartPos);
}
#endregion
Parser = parser;
HasContents = false;
return(myTagEndPos + cTagDelimiter.Length);
}
/// <summary> /// Reads the tag at the specified position in the specified word and separator array. /// </summary> /// <param name="parentTag"> /// The parent tag of this tag. This argument is used to determine /// the end of the tag (it can be the end of the parent tag). /// </param> /// <returns> /// The position after the tag (at which to continue reading). /// </returns> protected abstract int InitializeCoreFromText(SqlStringParserBase parser, string text, int position, TagBase parentTag);