Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / MultipartIdentifier.cs / 1 / MultipartIdentifier.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.Common { using System.Diagnostics; using System.Text; using System.Globalization; internal class MultipartIdentifier { private const int MaxParts = 4; internal const int ServerIndex = 0; internal const int CatalogIndex = 1; internal const int SchemaIndex = 2; internal const int TableIndex = 3; /* Left quote strings need to correspond 1 to 1 with the right quote strings example: "ab" "cd", passed in for the left and the right quote would set a or b as a starting quote character. If a is the starting quote char then c would be the ending quote char otherwise if b is the starting quote char then d would be the ending quote character. */ internal static string[] ParseMultipartIdentifier(string name, string leftQuote, string rightQuote, string property, bool ThrowOnEmptyMultipartName) { return ParseMultipartIdentifier(name, leftQuote, rightQuote,'.', MaxParts, true, property, ThrowOnEmptyMultipartName); } private enum MPIState { MPI_Value, MPI_ParseNonQuote, MPI_LookForSeparator, MPI_LookForNextCharOrSeparator, MPI_ParseQuote, MPI_RightQuote, } /* Core function for parsing the multipart identifer string. * paramaters: name - string to parse * leftquote: set of characters which are valid quoteing characters to initiate a quote * rightquote: set of characters which are valid to stop a quote, array index's correspond to the the leftquote array. * separator: separator to use * limit: number of names to parse out * removequote:to remove the quotes on the returned string */ private static void IncrementStringCount (string name, string[] ary, ref int position, string property) { ++position; int limit = ary.Length; if (position >= limit) { throw ADP.InvalidMultipartNameToManyParts (property, name, limit); } ary[position] = string.Empty; } private static bool IsWhitespace (char ch) { return Char.IsWhiteSpace (ch); } internal static string[] ParseMultipartIdentifier(string name, string leftQuote, string rightQuote, char separator, int limit, bool removequotes, string property, bool ThrowOnEmptyMultipartName) { if (limit <= 0) { throw ADP.InvalidMultipartNameToManyParts (property, name, limit); } if (-1 != leftQuote.IndexOf(separator) || -1 != rightQuote.IndexOf(separator) || leftQuote.Length != rightQuote.Length) { throw ADP.InvalidMultipartNameIncorrectUsageOfQuotes (property, name); } string[] parsedNames = new string[limit]; // return string array int stringCount = 0; // index of current string in the buffer MPIState state = MPIState.MPI_Value; // Initalize the starting state StringBuilder sb = new StringBuilder (name.Length); // String buffer to hold the string being currently built, init the string builder so it will never be resized StringBuilder whitespaceSB = null; // String buffer to hold white space used when parsing nonquoted strings 'a b . c d' = 'a b' and 'c d' char rightQuoteChar = ' '; // Right quote character to use given the left quote character found. for (int index = 0; index < name.Length; ++index) { char testchar = name[index]; switch (state) { case MPIState.MPI_Value : { int quoteIndex; if (IsWhitespace (testchar)) { // Is White Space then skip the whitespace continue; } else if (testchar == separator) { // If we found a separator, no string was found, initalize the string we are parsing to Empty and the next one to Empty. // This is NOT a redundent setting of string.Empty it solves the case where we are parsing ".foo" and we should be returning null, null, empty, foo parsedNames[stringCount] = string.Empty; IncrementStringCount (name, parsedNames, ref stringCount, property); } else if (-1 != (quoteIndex = leftQuote.IndexOf(testchar))) { // If we are a left quote rightQuoteChar = rightQuote[quoteIndex]; // record the corresponding right quote for the left quote sb.Length = 0; if (!removequotes) { sb.Append (testchar); } state = MPIState.MPI_ParseQuote; } else if (-1 != rightQuote.IndexOf(testchar)) { // If we shouldn't see a right quote throw ADP.InvalidMultipartNameIncorrectUsageOfQuotes (property, name); } else { sb.Length = 0; sb.Append (testchar); state = MPIState.MPI_ParseNonQuote; } break; } case MPIState.MPI_ParseNonQuote: { if (testchar == separator) { parsedNames[stringCount] = sb.ToString (); // set the currently parsed string IncrementStringCount (name, parsedNames, ref stringCount, property); state = MPIState.MPI_Value; } else // Quotes are not valid inside a non-quoted name if (-1 != rightQuote.IndexOf (testchar)) { throw ADP.InvalidMultipartNameIncorrectUsageOfQuotes (property, name); } else if (-1 != leftQuote.IndexOf(testchar)) { throw ADP.InvalidMultipartNameIncorrectUsageOfQuotes (property, name); } else if (IsWhitespace (testchar)) { // If it is Whitespace parsedNames[stringCount] = sb.ToString (); // Set the currently parsed string if (null == whitespaceSB) { whitespaceSB = new StringBuilder (); } whitespaceSB.Length = 0; whitespaceSB.Append (testchar); // start to record the white space, if we are parsing a name like "foo bar" we should return "foo bar" state = MPIState.MPI_LookForNextCharOrSeparator; } else { sb.Append (testchar); } break; } case MPIState.MPI_LookForNextCharOrSeparator : { if (!IsWhitespace (testchar)) { // If it is not whitespace if (testchar == separator) { IncrementStringCount (name, parsedNames, ref stringCount, property); state = MPIState.MPI_Value; } else { // If its not a separator and not whitespace sb.Append (whitespaceSB); sb.Append (testchar); parsedNames[stringCount] = sb.ToString (); // Need to set the name here in case the string ends here. state = MPIState.MPI_ParseNonQuote; } } else { whitespaceSB.Append (testchar); } break; } case MPIState.MPI_ParseQuote: { if (testchar == rightQuoteChar) { // if se are on a right quote see if we are escapeing the right quote or ending the quoted string if (!removequotes) { sb.Append (testchar); } state = MPIState.MPI_RightQuote; } else { sb.Append (testchar); // Append what we are currently parsing } break; } case MPIState.MPI_RightQuote : { if (testchar == rightQuoteChar) { // If the next char is a another right quote then we were escapeing the right quote sb.Append (testchar); state = MPIState.MPI_ParseQuote; } else if (testchar == separator) { // If its a separator then record what we've parsed parsedNames[stringCount] = sb.ToString (); IncrementStringCount (name, parsedNames, ref stringCount, property); state = MPIState.MPI_Value; } else if (!IsWhitespace (testchar)) { // If it is not white space we got problems throw ADP.InvalidMultipartNameIncorrectUsageOfQuotes (property, name); } else { // It is a whitespace character so the following char should be whitespace, separator, or end of string anything else is bad parsedNames[stringCount] = sb.ToString (); state = MPIState.MPI_LookForSeparator; } break; } case MPIState.MPI_LookForSeparator : { if (!IsWhitespace (testchar)) { // If it is not whitespace if (testchar == separator) { // If it is a separator IncrementStringCount (name, parsedNames, ref stringCount, property); state = MPIState.MPI_Value; } else { // Othewise not a separator throw ADP.InvalidMultipartNameIncorrectUsageOfQuotes (property, name); } } break; } } } // Resolve final states after parsing the string switch (state) { case MPIState.MPI_Value : // These states require no extra action case MPIState.MPI_LookForSeparator : case MPIState.MPI_LookForNextCharOrSeparator : break; case MPIState.MPI_ParseNonQuote: // Dump what ever was parsed case MPIState.MPI_RightQuote : parsedNames[stringCount] = sb.ToString (); break; case MPIState.MPI_ParseQuote: // Invalid Ending States default: throw ADP.InvalidMultipartNameIncorrectUsageOfQuotes (property, name); } if (parsedNames[0] == null) { if (ThrowOnEmptyMultipartName) { throw ADP.InvalidMultipartName (property, name); // Name is entirely made up of whitespace } } else { // Shuffle the parsed name, from left justification to right justification, ie [a][b][null][null] goes to [null][null][a][b] int offset = limit - stringCount - 1; if (offset > 0) { for (int x = limit - 1; x >= offset; --x) { parsedNames[x] = parsedNames[x - offset]; parsedNames[x - offset] = null; } } } return parsedNames; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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