Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Speech / Src / Internal / SrgsCompiler / Item.cs / 1 / Item.cs
//------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------- using System; using System.Speech.Internal.SrgsParser; namespace System.Speech.Internal.SrgsCompiler { ////// Summary description for Rule. /// internal sealed class Item : ParseElementCollection, IItem { //******************************************************************* // // Constructors // //******************************************************************* #region Constructors internal Item (Backend backend, Rule rule, int minRepeat, int maxRepeat, float repeatProbability, float weigth) : base (backend, rule) { // Validated by the caller _minRepeat = minRepeat; _maxRepeat = maxRepeat; _repeatProbability = repeatProbability; } #endregion //******************************************************************** // // Internal Method // //******************************************************************* #region Intenal Method ////// Process the '/item' element. /// /// void IElement.PostParse (IElement parentElement) { // Special case of no words but only tags. Returns an error as the result is ambiguous //var res= 1; //- //
// Should the result be 2 or 4 if (_maxRepeat != _minRepeat && _startArc != null && _startArc == _endArc && _endArc.IsEpsilonTransition && !_endArc.IsPropertylessTransition) { XmlParser.ThrowSrgsException ((SRID.InvalidTagInAnEmptyItem)); } // emptyres= res * 2; //- or repeat count == 0 if (_startArc == null || _maxRepeat == 0) { // Special Case: _maxRepeat = 0 => Epsilon transition. if (_maxRepeat == 0 && _startArc != null && _startArc.End != null) { // Delete contents of Item. Otherwise, we will end up with states disconnected to the rest of the rule. State endState = _startArc.End; _startArc.End = null; _backend.DeleteSubGraph (endState); } // empty item, just add an epsilon transition. _startArc = _endArc = _backend.EpsilonTransition (_repeatProbability); } else { // Hard case if repeat count is not one if (_minRepeat != 1 || _maxRepeat != 1) { // Dupplicate the states/transitions graph as many times as repeat count //Add a state before the start to be able to duplicate the graph _startArc = InsertState (_startArc, _repeatProbability, Position.Before); State startState = _startArc.End; // If _maxRepeat = Infinite, add epsilon transition loop back to the start of this if (_maxRepeat == System.Int32.MaxValue && _minRepeat == 1) { _endArc = InsertState (_endArc, 1.0f, Position.After); AddEpsilonTransition (_endArc.Start, startState, 1 - _repeatProbability); } else { State currentStartState = startState; // For each additional repeat count, clone a new subgraph and connect with appropriate transitions. for (UInt32 cnt = 1; cnt < _maxRepeat && cnt < 255; cnt++) { // Prepare to clone a new subgraph matching the
- content. State newStartState = _backend.CreateNewState (_endArc.Start.Rule); // Clone subgraphs and update CurrentEndState. State newEndState = _backend.CloneSubGraph (currentStartState, _endArc.Start, newStartState); // Connect the last state with the first state //_endArc.Start.OutArcs.Add (_endArc); _endArc.End = newStartState; // reset the _endArc System.Diagnostics.Debug.Assert (newEndState.OutArcs.CountIsOne && Arc.CompareContent (_endArc, newEndState.OutArcs.First) == 0); _endArc = newEndState.OutArcs.First; if (_maxRepeat == System.Int32.MaxValue) { // If we are beyond _minRepeat, add epsilon transition frorm startState with (1-_repeatProbability). if (cnt == _minRepeat - 1) { // Create a new state and attach the last Arc to add _endArc = InsertState (_endArc, 1.0f, Position.After); AddEpsilonTransition (_endArc.Start, newStartState, 1 - _repeatProbability); break; } } else if (cnt <= _maxRepeat - _minRepeat) { // If we are beyond _minRepeat, add epsilon transition frorm startState with (1-_repeatProbability). AddEpsilonTransition (startState, newStartState, 1 - _repeatProbability); } // reset the current start state currentStartState = newStartState; } } // If _minRepeat == 0, add epsilon transition from currentEndState to FinalState with (1-_repeatProbability). // but do not do it if the only transition is an epsilon if (_minRepeat == 0 && (_startArc != _endArc || !_startArc.IsEpsilonTransition)) { if (!_endArc.IsEpsilonTransition || _endArc.SemanticTagCount > 0) { _endArc = InsertState (_endArc, 1.0f, Position.After); } AddEpsilonTransition (startState, _endArc.Start, 1 - _repeatProbability); } // Remove the added startState if possible _startArc = TrimStart (_startArc, _backend); } } // Add this item to the parent list base.PostParse ((ParseElementCollection) parentElement); } #endregion //******************************************************************** // // Private Methods // //******************************************************************** #region Private Methods private void AddEpsilonTransition (State start, State end, float weigth) { Arc epsilon = _backend.EpsilonTransition (weigth); epsilon.Start = start; epsilon.End = end; } #endregion //******************************************************************* // // Private Fields // //******************************************************************** #region Private Fields private float _repeatProbability = 0.5f; private int _minRepeat = NotSet; private int _maxRepeat = NotSet; private const int NotSet = -1; #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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