AppDomainGrammarProxy.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Speech / Src / Internal / SrgsCompiler / AppDomainGrammarProxy.cs / 1 / AppDomainGrammarProxy.cs
                        
                        
                            //  
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//
// 
// Description:
//      AppDomainProxy for the SrgsCompiler 
// 
// History:
//      10/1/2004   [....]      Created 
//----------------------------------------------------------------------------

#region Using directives
 
using System;
using System.Globalization; 
using System.Reflection; 
using System.Security;
using System.Security.Permissions; 
using System.Security.Policy;
using System.Speech.Recognition;
using System.Speech.Recognition.SrgsGrammar;
using System.Text; 

#endregion 
 
#pragma warning disable 1634, 1691 // Allows suppression of certain PreSharp messages.
#pragma warning disable 56500 // Remove all the catch all statements warnings used by the interop layer 

namespace System.Speech.Internal.SrgsCompiler
{
    ///  
    /// TODOC
    ///  
    internal class AppDomainGrammarProxy : MarshalByRefObject 
    {
        internal SrgsRule [] OnInit (string method, object [] parameters, string onInitParameters, out Exception exceptionThrown) 
        {
            exceptionThrown = null;
            try
            { 

                // If the onInitParameters are provided as a string, get the values as an array of value. 
                if (!string.IsNullOrEmpty (onInitParameters)) 
                {
                    parameters = MatchInitParameters (method, onInitParameters, _rule, _rule); 
                }

                // Find the constructor to call - there could be several
                Type [] types = new Type [parameters != null ? parameters.Length : 0]; 

                if (parameters != null) 
                { 
                    for (int i = 0; i < parameters.Length; i++)
                    { 
                        types [i] = parameters [i].GetType ();
                    }
                }
 
                MethodInfo onInit = _grammarType.GetMethod (method, types);
 
                // If somehow we failed to find a constructor, let the system handle it 
                if (onInit == null)
                { 
                    throw new InvalidOperationException (SR.Get (SRID.ArgumentMismatch));
                }

                SrgsRule [] extraRules = null; 
                if (onInit != null)
                { 
                    _internetPermissionSet.PermitOnly (); 
                    extraRules = (SrgsRule []) onInit.Invoke (_grammar, parameters);
                } 
                return extraRules;
            }
            catch (Exception e)
            { 
                exceptionThrown = e;
                return null; 
            } 
        }
 
        internal object OnRecognition (string method, object [] parameters, out Exception exceptionThrown)
        {
            exceptionThrown = null;
            try 
            {
                MethodInfo onRecognition = _grammarType.GetMethod (method, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic); 
 
                // Execute the parse routine
                _internetPermissionSet.PermitOnly (); 
                return onRecognition.Invoke (_grammar, parameters);
            }
            catch (Exception e)
            { 
                exceptionThrown = e;
            } 
            return null; 
        }
 
        internal object OnParse (string rule, string method, object [] parameters, out Exception exceptionThrown)
        {
            exceptionThrown = null;
            try 
            {
                MethodInfo onParse; 
                System.Speech.Recognition.Grammar grammar; 
                GetRuleInstance (rule, method, out onParse, out grammar);
 
                // Execute the parse routine
                _internetPermissionSet.PermitOnly ();
                return onParse.Invoke (grammar, parameters);
            } 
            catch (Exception e)
            { 
                exceptionThrown = e; 
                return null;
            } 
        }

        internal void OnError (string rule, string method, object [] parameters, out Exception exceptionThrown)
        { 
            exceptionThrown = null;
            try 
            { 
                MethodInfo onError;
                System.Speech.Recognition.Grammar grammar; 
                GetRuleInstance (rule, method, out onError, out grammar);

                // Execute the parse routine
                _internetPermissionSet.PermitOnly (); 
                onError.Invoke (grammar, parameters);
            } 
            catch (Exception e) 
            {
                exceptionThrown = e; 
            }
        }

        internal void Init (string rule, byte [] il, byte [] pdb) 
        {
            _assembly = Assembly.Load (il, pdb); 
 
            // Get the grammar class carrying the .Net Semantics code
            _grammarType = GetTypeForRule (_assembly, rule); 

            // Something is Wrong if the grammar class cannot be found
            if (_grammarType == null)
            { 
                throw new FormatException (SR.Get (SRID.RecognizerRuleNotFoundStream, rule));
            } 
            _rule = rule; 
            try
            { 
                _grammar = (System.Speech.Recognition.Grammar) _assembly.CreateInstance (_grammarType.FullName);
            }
            catch (MissingMemberException)
            { 
                throw new ArgumentException (SR.Get (SRID.RuleScriptInvalidParameters, _grammarType.FullName, rule), "rule");
            } 
            _internetPermissionSet = PolicyLevel.CreateAppDomainLevel ().GetNamedPermissionSet ("Internet"); 
            _internetPermissionSet.AddPermission (new ReflectionPermission (PermissionState.Unrestricted));
        } 

        private void GetRuleInstance (string rule, string method, out MethodInfo onParse, out System.Speech.Recognition.Grammar grammar)
        {
            Type ruleClass = rule == _rule ? _grammarType : GetTypeForRule (_assembly, rule); 
            if (ruleClass == null || !ruleClass.IsSubclassOf (typeof (System.Speech.Recognition.Grammar)))
            { 
                throw new FormatException (SR.Get (SRID.RecognizerInvalidBinaryGrammar)); 
            }
 
            try
            {
                grammar = ruleClass == _grammarType ? _grammar : (System.Speech.Recognition.Grammar) _assembly.CreateInstance (ruleClass.FullName);
            } 
            catch (MissingMemberException)
            { 
                throw new ArgumentException (SR.Get (SRID.RuleScriptInvalidParameters, ruleClass.FullName, rule), "rule"); 
            }
            onParse = grammar.MethodInfo (method); 
        }

        static private Type GetTypeForRule (Assembly assembly, string rule)
        { 
            Type [] types = assembly.GetTypes ();
            for (int iType = 0; iType < types.Length; iType++) 
            { 
                Type type = types [iType];
                if (type.Name == rule && type.IsPublic && type.IsSubclassOf (typeof (System.Speech.Recognition.Grammar))) 
                {
                    return type;
                }
            } 
            return null;
        } 
 
        /// 
        /// Construct a list of parameters from a sapi:params string. 
        /// 
        /// 
        /// 
        ///  
        /// 
        ///  
        private object [] MatchInitParameters (string method, string onInitParameters, string grammar, string rule) 
        {
            MethodInfo [] mis = _grammarType.GetMethods (); 

            NameValuePair [] pairs = ParseInitParams (onInitParameters);
            object [] values = new object [pairs.Length];
            bool foundConstructor = false; 
            for (int iCtor = 0; iCtor < mis.Length && !foundConstructor; iCtor++)
            { 
                if (mis [iCtor].Name != method) 
                {
                    continue; 
                }
                ParameterInfo [] paramInfo = mis [iCtor].GetParameters ();

                // Check if enough parameters are provided. 
                if (paramInfo.Length > pairs.Length)
                { 
                    continue; 
                }
                foundConstructor = true; 
                for (int i = 0; i < pairs.Length && foundConstructor; i++)
                {
                    NameValuePair pair = pairs [i];
 
                    // annonymous
                    if (pair._name == null) 
                    { 
                        values [i] = pair._value;
                    } 
                    else
                    {
                        bool foundParameter = false;
                        for (int j = 0; j < paramInfo.Length; j++) 
                        {
                            if (paramInfo [j].Name == pair._name) 
                            { 
                                values [j] = ParseValue (paramInfo [j].ParameterType, pair._value);
                                foundParameter = true; 
                                break;
                            }
                        }
                        if (!foundParameter) 
                        {
                            foundConstructor = false; 
                        } 
                    }
                } 
            }
            if (!foundConstructor)
            {
                throw new FormatException (SR.Get (SRID.CantFindAConstructor, grammar, rule, FormatConstructorParameters (mis, method))); 
            }
            return values; 
        } 

        ///  
        /// Parse the value for a type from a string to a strong type.
        /// If the type does not support the Parse method then the operation fails.
        /// 
        ///  
        /// 
        ///  
        private static object ParseValue (Type type, string value) 
        {
            if (type == typeof (string)) 
            {
                return value;
            }
            return type.InvokeMember ("Parse", BindingFlags.InvokeMethod, null, null, new object [] { value }, CultureInfo.InvariantCulture); 
        }
 
        ///  
        /// Returns the list of the possible parameter names and type for a grammar
        ///  
        /// 
        /// 
        /// 
        private static string FormatConstructorParameters (MethodInfo [] cis, string method) 
        {
            StringBuilder sb = new StringBuilder (); 
            for (int iCtor = 0; iCtor < cis.Length; iCtor++) 
            {
                if (cis [iCtor].Name == method) 
                {
                    sb.Append (sb.Length > 0 ? " or sapi:parms=\"" : "sapi:parms=\"");
                    ParameterInfo [] pis = cis [iCtor].GetParameters ();
                    for (int i = 0; i < pis.Length; i++) 
                    {
                        if (i > 0) 
                        { 
                            sb.Append (';');
                        } 
                        ParameterInfo pi = pis [i];
                        sb.Append (pi.Name);
                        sb.Append (':');
                        sb.Append (pi.ParameterType.Name); 
                    }
                    sb.Append ("\""); 
                } 
            }
            return sb.ToString (); 
        }

        /// 
        /// Split the init parameter strings into an array of name/values 
        /// The format must be "name:value". If the ':' then parameter is anonymous.
        ///  
        ///  
        /// 
        private static NameValuePair [] ParseInitParams (string initParameters) 
        {
            string[] parameters = initParameters.Split(new char[] { ';' }, StringSplitOptions.None);
            NameValuePair [] pairs = new NameValuePair [parameters.Length];
 
            for (int i = 0; i < parameters.Length; i++)
            { 
                string parameter = parameters [i]; 
                int posColon = parameter.IndexOf (':');
                if (posColon >= 0) 
                {
                    pairs [i]._name = parameter.Substring (0, posColon);
                    pairs [i]._value = parameter.Substring (posColon + 1);
                } 
                else
                { 
                    pairs [i]._value = parameter; 
                }
            } 
            return pairs;
        }

#pragma warning disable 56524 // Arclist does not hold on any resouces 

        private System.Speech.Recognition.Grammar _grammar; 
 
#pragma warning restore 56524 // Arclist does not hold on any resouces
 
        private Assembly _assembly;
        private string _rule;
        private Type _grammarType;
        private PermissionSet _internetPermissionSet; 

        private struct NameValuePair 
        { 
            internal string _name;
            internal string _value; 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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