254 lines
13 KiB
C#
254 lines
13 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="MultipartIdentifier.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner [....]
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// @backupOwner [....]
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//---------------------------------------------------------------------
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using System.Diagnostics;
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using System.Text;
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using System.Collections.Generic;
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namespace System.Data.Common.Internal
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{
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/// <summary>
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/// Copied from System.Data.dll
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/// </summary>
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internal static class MultipartIdentifier
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{
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private const int MaxParts = 4;
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internal const int ServerIndex = 0;
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internal const int CatalogIndex = 1;
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internal const int SchemaIndex = 2;
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internal const int TableIndex = 3;
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private enum MPIState
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{
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MPI_Value,
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MPI_ParseNonQuote,
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MPI_LookForSeparator,
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MPI_LookForNextCharOrSeparator,
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MPI_ParseQuote,
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MPI_RightQuote,
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}
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private static void IncrementStringCount(List<string> ary, ref int position)
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{
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++position;
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ary.Add(string.Empty);
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}
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private static bool IsWhitespace(char ch)
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{
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return Char.IsWhiteSpace(ch);
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}
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/// <summary>
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/// Core function for parsing the multipart identifer string.
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/// Note: Left quote strings need to correspond 1 to 1 with the right quote strings
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/// example: "ab" "cd", passed in for the left and the right quote
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/// would set a or b as a starting quote character.
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/// If a is the starting quote char then c would be the ending quote char
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/// otherwise if b is the starting quote char then d would be the ending quote character.
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/// </summary>
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/// <param name="name">string to parse</param>
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/// <param name="leftQuote">set of characters which are valid quoteing characters to initiate a quote</param>
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/// <param name="rightQuote">set of characters which are valid to stop a quote, array index's correspond to the the leftquote array.</param>
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/// <param name="separator">separator to use</param>
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/// <returns></returns>
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internal static List<string> ParseMultipartIdentifier(string name, string leftQuote, string rightQuote, char separator)
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{
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Debug.Assert(-1 == leftQuote.IndexOf(separator) && -1 == rightQuote.IndexOf(separator) && leftQuote.Length == rightQuote.Length, "Incorrect usage of quotes");
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List<string> parsedNames = new List<string>();
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parsedNames.Add(null);
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int stringCount = 0; // index of current string in the list
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MPIState state = MPIState.MPI_Value; // Initalize the starting state
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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
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StringBuilder whitespaceSB = null; // String buffer to hold white space used when parsing nonquoted strings 'a b . c d' = 'a b' and 'c d'
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char rightQuoteChar = ' '; // Right quote character to use given the left quote character found.
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for (int index = 0; index < name.Length; ++index)
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{
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char testchar = name[index];
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switch (state)
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{
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case MPIState.MPI_Value:
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{
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int quoteIndex;
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if (IsWhitespace(testchar))
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{ // Is White Space then skip the whitespace
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continue;
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}
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else
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if (testchar == separator)
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{ // If we found a separator, no string was found, initalize the string we are parsing to Empty and the next one to Empty.
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// 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
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parsedNames[stringCount] = string.Empty;
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IncrementStringCount(parsedNames, ref stringCount);
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}
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else
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if (-1 != (quoteIndex = leftQuote.IndexOf(testchar)))
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{ // If we are a left quote
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rightQuoteChar = rightQuote[quoteIndex]; // record the corresponding right quote for the left quote
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sb.Length = 0;
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state = MPIState.MPI_ParseQuote;
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}
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else
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if (-1 != rightQuote.IndexOf(testchar))
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{ // If we shouldn't see a right quote
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throw EntityUtil.ADP_InvalidMultipartNameDelimiterUsage();
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}
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else
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{
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sb.Length = 0;
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sb.Append(testchar);
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state = MPIState.MPI_ParseNonQuote;
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}
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break;
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}
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case MPIState.MPI_ParseNonQuote:
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{
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if (testchar == separator)
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{
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parsedNames[stringCount] = sb.ToString(); // set the currently parsed string
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IncrementStringCount(parsedNames, ref stringCount);
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state = MPIState.MPI_Value;
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}
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else // Quotes are not valid inside a non-quoted name
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if (-1 != rightQuote.IndexOf(testchar))
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{
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throw EntityUtil.ADP_InvalidMultipartNameDelimiterUsage();
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}
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else
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if (-1 != leftQuote.IndexOf(testchar))
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{
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throw EntityUtil.ADP_InvalidMultipartNameDelimiterUsage();
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}
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else
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if (IsWhitespace(testchar))
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{ // If it is Whitespace
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parsedNames[stringCount] = sb.ToString(); // Set the currently parsed string
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if (null == whitespaceSB)
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{
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whitespaceSB = new StringBuilder();
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}
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whitespaceSB.Length = 0;
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whitespaceSB.Append(testchar); // start to record the white space, if we are parsing a name like "name with space" we should return "name with space"
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state = MPIState.MPI_LookForNextCharOrSeparator;
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}
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else
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{
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sb.Append(testchar);
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}
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break;
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}
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case MPIState.MPI_LookForNextCharOrSeparator:
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{
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if (!IsWhitespace(testchar))
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{ // If it is not whitespace
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if (testchar == separator)
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{
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IncrementStringCount(parsedNames, ref stringCount);
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state = MPIState.MPI_Value;
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}
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else
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{ // If its not a separator and not whitespace
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sb.Append(whitespaceSB);
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sb.Append(testchar);
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parsedNames[stringCount] = sb.ToString(); // Need to set the name here in case the string ends here.
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state = MPIState.MPI_ParseNonQuote;
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}
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}
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else
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{
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whitespaceSB.Append(testchar);
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}
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break;
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}
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case MPIState.MPI_ParseQuote:
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{
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if (testchar == rightQuoteChar)
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{ // if se are on a right quote see if we are escapeing the right quote or ending the quoted string
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state = MPIState.MPI_RightQuote;
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}
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else
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{
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sb.Append(testchar); // Append what we are currently parsing
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}
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break;
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}
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case MPIState.MPI_RightQuote:
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{
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if (testchar == rightQuoteChar)
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{ // If the next char is a another right quote then we were escapeing the right quote
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sb.Append(testchar);
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state = MPIState.MPI_ParseQuote;
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}
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else
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if (testchar == separator)
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{ // If its a separator then record what we've parsed
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parsedNames[stringCount] = sb.ToString();
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IncrementStringCount(parsedNames, ref stringCount);
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state = MPIState.MPI_Value;
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}
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else
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if (!IsWhitespace(testchar))
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{ // If it is not white space we got problems
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throw EntityUtil.ADP_InvalidMultipartNameDelimiterUsage();
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}
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else
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{ // It is a whitespace character so the following char should be whitespace, separator, or end of string anything else is bad
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parsedNames[stringCount] = sb.ToString();
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state = MPIState.MPI_LookForSeparator;
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}
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break;
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}
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case MPIState.MPI_LookForSeparator:
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{
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if (!IsWhitespace(testchar))
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{ // If it is not whitespace
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if (testchar == separator)
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{ // If it is a separator
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IncrementStringCount(parsedNames, ref stringCount);
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state = MPIState.MPI_Value;
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}
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else
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{ // Othewise not a separator
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throw EntityUtil.ADP_InvalidMultipartNameDelimiterUsage();
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}
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}
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break;
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}
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}
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}
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// Resolve final states after parsing the string
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switch (state)
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{
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case MPIState.MPI_Value: // These states require no extra action
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case MPIState.MPI_LookForSeparator:
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case MPIState.MPI_LookForNextCharOrSeparator:
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break;
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case MPIState.MPI_ParseNonQuote: // Dump what ever was parsed
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case MPIState.MPI_RightQuote:
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parsedNames[stringCount] = sb.ToString();
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break;
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case MPIState.MPI_ParseQuote: // Invalid Ending States
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default:
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throw EntityUtil.ADP_InvalidMultipartNameDelimiterUsage();
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}
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return parsedNames;
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}
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}
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}
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