Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Speech / Src / Internal / AlphabetConverter.cs / 1 / AlphabetConverter.cs
//---------------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // // // Description: // Convert Between phonemes string between SAPI, UPS and IPA // // History: // 11/15/2005 [....] Created interface code. // 11/17/2005 [....] Added conversion methods. //--------------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Globalization; using System.Collections; using System.Reflection; using System.IO; using System.Text; #pragma warning disable 1634, 1691 // Allows suppression of certain PreSharp messages. namespace System.Speech.Internal { internal enum AlphabetType { Sapi, Ipa, Ups } ////// This class allows conversion between SAPI and IPA phonemes. /// Objects of this class are not thread safe for modifying state. /// internal class AlphabetConverter { //******************************************************************* // // Constructors // //******************************************************************* #region Constructors internal AlphabetConverter (int langId) { _currentLangId = -1; SetLanguageId (langId); } #endregion //******************************************************************** // // Internal Methods // //******************************************************************* #region internal Methods ////// Convert from SAPI phonemes to IPA phonemes. /// /// ////// Return an array of unicode characters each of which represents an IPA phoneme if the SAPI phonemes are valid. /// Otherwise, return null. /// internal char [] SapiToIpa (char [] phonemes) { return Convert (phonemes, true); } ////// Convert from IPA phonemes to SAPI phonemes. /// /// /// Return an array of unicode characters each of which represents a SAPI phoneme if the IPA phonemes are valid. /// Otherwise, return null. ///internal char [] IpaToSapi (char [] phonemes) { return Convert (phonemes, false); } /// /// Determines whether a given string of SAPI ids can be potentially converted using a single /// conversion unit, that is, a prefix of some convertible string. /// /// The string of SAPI or UPS phoneme ids /// To indicate whether parameter phonemes is in SAPI or UPS phonemes ///internal bool IsPrefix(string phonemes, bool isSapi) { return _phoneMap.IsPrefix(phonemes, isSapi); } internal bool IsConvertibleUnit(string phonemes, bool isSapi) { return _phoneMap.ConvertPhoneme(phonemes, isSapi) != null; } internal int SetLanguageId (int langId) { if (langId < 0) { throw new ArgumentException (SR.Get (SRID.MustBeGreaterThanZero), "langId"); } if (langId == _currentLangId) { return _currentLangId; } int i; int oldLangId = _currentLangId; for (i = 0; i < _langIds.Length; i++) { if (_langIds [i] == langId) { break; } } if (i == _langIds.Length) { _currentLangId = langId; _phoneMap = null; } else { lock (_staticLock) { if (_phoneMaps [i] == null) { _phoneMaps [i] = CreateMap (_resourceNames [i]); } _phoneMap = _phoneMaps [i]; _currentLangId = langId; } } return oldLangId; } #endregion //******************************************************************** // // Private Methods // //******************************************************************** #region Private Methods private char [] Convert (char [] phonemes, bool isSapi) { // If the phoneset of the selected language is UPS anyway, that is phone mapping is unnecessary, // we return the same phoneme string. But we still need to make a copy. if (_phoneMap == null || phonemes.Length == 0) { return (char []) phonemes.Clone (); } // // We break the phoneme string into substrings of phonemes, each of which is directly convertible from // the mapping table. If there is ambiguity, we always choose the largest substring as we go from left // to right. // // In order to do this, we check whether a given substring is a potential prefix of a convertible substring. // StringBuilder result = new StringBuilder (); int startIndex; // Starting index of a substring being considered int endIndex; // The ending index of the last convertible substring String token; // Holds a substring of phonemes that are directly convertible from the mapping table. String lastConvert; // Holds last convertible substring, starting from startIndex. String tempConvert; String source = new String (phonemes); int i; lastConvert = null; startIndex = i = 0; endIndex = -1; #pragma warning disable 56507 while (i < source.Length) { token = source.Substring (startIndex, i - startIndex + 1); if (_phoneMap.IsPrefix (token, isSapi)) { tempConvert = _phoneMap.ConvertPhoneme (token, isSapi); // Note we may have an empty string for conversion result here if (tempConvert != null) { lastConvert = tempConvert; endIndex = i; } } else { // If we have not had a convertible substring, the input is not convertible. if (lastConvert == null) { break; } else { // Use the converted substring, and start over from the last convertible position. result.Append (lastConvert); i = endIndex; startIndex = endIndex + 1; lastConvert = null; } } i++; } if (lastConvert != null && endIndex == phonemes.Length - 1) { result.Append (lastConvert); } else { return null; } #pragma warning restore 56507 return result.ToString ().ToCharArray (); } private PhoneMapData CreateMap (string resourceName) { Assembly assembly = Assembly.GetAssembly (GetType ()); Stream stream = assembly.GetManifestResourceStream(resourceName); if (stream == null) { throw new FileLoadException(SR.Get(SRID.CannotLoadResourceFromManifest, resourceName, assembly.FullName)); } return new PhoneMapData (new BufferedStream (stream)); } #endregion //******************************************************************* // // Private Fields // //******************************************************************** #region Private Fields private int _currentLangId; private PhoneMapData _phoneMap; private static int[] _langIds = new int[] { 0x804, 0x404, 0x407, 0x409, 0x40A, 0x40C, 0x411}; private static String[] _resourceNames = new String[] { "upstable_chs.upsmap", "upstable_cht.upsmap", "upstable_deu.upsmap", "upstable_enu.upsmap", "upstable_esp.upsmap", "upstable_fra.upsmap", "upstable_jpn.upsmap", }; private static PhoneMapData [] _phoneMaps = new PhoneMapData [7]; private static object _staticLock = new object (); #endregion //******************************************************************* // // Private Type // //******************************************************************* #region Private Type internal class PhoneMapData { private class ConversionUnit { public String sapi; public String ups; public bool isDefault; } internal PhoneMapData (Stream input) { using (BinaryReader reader = new BinaryReader (input, System.Text.Encoding.Unicode)) { int size = reader.ReadInt32 (); convertTable = new ConversionUnit [size]; int i; for (i = 0; i < size; i++) { convertTable [i] = new ConversionUnit (); convertTable [i].sapi = ReadPhoneString (reader); convertTable [i].ups = ReadPhoneString (reader); convertTable [i].isDefault = reader.ReadInt32 () != 0 ? true : false; } prefixSapiTable = InitializePrefix (true); prefixUpsTable = InitializePrefix (false); } } internal bool IsPrefix (string prefix, bool isSapi) { if (isSapi) { return prefixSapiTable.ContainsKey (prefix); } else { return prefixUpsTable.ContainsKey (prefix); } } internal string ConvertPhoneme (string phoneme, bool isSapi) { ConversionUnit unit; if (isSapi) { unit = (ConversionUnit) prefixSapiTable [phoneme]; } else { unit = (ConversionUnit) prefixUpsTable [phoneme]; } if (unit == null) { return null; } return isSapi ? unit.ups : unit.sapi; } /// /// Create a hash table of all possible prefix substrings for each ConversionUnit /// /// Creating a SAPI or UPS prefix table ///private Hashtable InitializePrefix (bool isSapi) { int i, j; Hashtable prefixTable = Hashtable.Synchronized (new Hashtable ()); string from, key; for (i = 0; i < convertTable.Length; i++) { if (isSapi) { from = convertTable [i].sapi; } else { from = convertTable [i].ups; } for (j = 0; j + 1 < from.Length; j++) { key = from.Substring (0, j + 1); if (!prefixTable.ContainsKey (key)) { prefixTable [key] = null; } } if (convertTable [i].isDefault || prefixTable [from] == null) { prefixTable [from] = convertTable [i]; } } return prefixTable; } static private string ReadPhoneString (BinaryReader reader) { int phoneLength; char [] phoneString; phoneLength = reader.ReadInt16 () / 2; phoneString = reader.ReadChars (phoneLength); return new String (phoneString, 0, phoneLength - 1); } private Hashtable prefixSapiTable, prefixUpsTable; private ConversionUnit [] convertTable; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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