scripter.cpp

OSB-PIK-OpenVXI-3.0.0源代码 “中国XML论坛 - 专业的XML技术讨论区--XML在语音技术中的应用”

 /****************License************************************************
  *
  * Copyright 2000-2003.  ScanSoft, Inc.    
  *
  * Use of this software is subject to notices and obligations set forth 
  * in the SpeechWorks Public License - Software Version 1.2 which is 
  * included with this software. 
  *
  * ScanSoft is a registered trademark of ScanSoft, Inc., and OpenSpeech, 
  * SpeechWorks and the SpeechWorks logo are registered trademarks or 
  * trademarks of SpeechWorks International, Inc. in the United States 
  * and other countries.
  *
  ***********************************************************************/
 
/***********************************************************************
  *
  * This is largely a wrapper around the VXIjsi interface.  The limited
  * responsibilities of this layer include:
  *
  *   (1) storing the VXIjsiContext and current scope name;
  *   (2) generating error.semantic exceptions for ECMAScript failures;
  *   (3) converting vxistring's to const wchar_t *;
  *   (4) converting VXIValue types.
  *
  ***********************************************************************/
 
 #include "Scripter.hpp"
 #include "CommonExceptions.hpp"
 #include "VXML.h"
 #include "VXIjsi.h"
 #include <sstream>
 
 // This is a simple conversion tool from VXIString -> vxistring.
 static vxistring toString(const VXIString * s)
 {
   if (s == NULL) return L"";
   const VXIchar * temp = VXIStringCStr(s);
   if (temp == NULL) return L"";
   return temp;
 }
 
 /*****************************************************************************
  * Constructor/Destructor - here is where the VXIjsiContext is managed.
  *****************************************************************************/
 
 Scripter::Scripter(VXIjsiInterface *jsiapi) : jsi_api(jsiapi)
 {
   if (jsi_api == NULL)
     maybe_throw_js_error(VXIjsi_RESULT_INVALID_ARGUMENT);
 
   maybe_throw_js_error(jsi_api->CreateContext(jsi_api, &jsi_context));
 }
 
 
 Scripter::~Scripter()
 {
   VXIjsiResult err = jsi_api->DestroyContext(jsi_api, &jsi_context);
 }
 
 /*****************************************************************************
  * Raise javascript exeception on error
  ****************************************************************************/
 void Scripter::maybe_throw_js_error(int err) const
 {
   switch (err) {
   case VXIjsi_RESULT_SUCCESS:
     return;
   case VXIjsi_RESULT_FAILURE:           // Normal failure
   case VXIjsi_RESULT_NON_FATAL_ERROR:   // Non-fatal non-specific error
   case VXIjsi_RESULT_SYNTAX_ERROR:      // JavaScript syntax error
   case VXIjsi_RESULT_SCRIPT_EXCEPTION:  // JavaScript exception thrown
   case VXIjsi_RESULT_SECURITY_VIOLATION:// JavaScript security violation
     throw VXIException::InterpreterEvent(EV_ERROR_ECMASCRIPT);
   default:
     throw VXIException::JavaScriptError();
   }
 }
 
 /*****************************************************************************
  * Wrappers around basic JSI interface. VXI only call JavaScript through here.
  *****************************************************************************/
 void Scripter::MakeVar(const vxistring & name, const vxistring & expr)
 {
   if (expr.empty()) {
     EvalScript(L"var " + name);
     return;
   }
 
   VXIjsiResult err = jsi_api->CreateVarExpr(jsi_api, jsi_context,
                                             name.c_str(), expr.c_str());
 
   // This handles variables such as x.y which are invalid arguments.
   if (err == VXIjsi_RESULT_INVALID_ARGUMENT && !name.empty())
     err = VXIjsi_RESULT_FAILURE;
 
   maybe_throw_js_error(err);
 }
 
 
 void Scripter::MakeVar(const vxistring & name, const VXIValue * value)
 {
   VXIjsiResult err = jsi_api->CreateVarValue(jsi_api, jsi_context,
                                              name.c_str(), value);
 
   // This handles variables such as x.y which are invalid arguments.
   if (err == VXIjsi_RESULT_INVALID_ARGUMENT && !name.empty())
     err = VXIjsi_RESULT_FAILURE;
 
   maybe_throw_js_error(err);
 }
 
 
 void Scripter::SetVar(const vxistring & name, const vxistring & expr)
 {
   VXIjsiResult err = jsi_api->SetVarExpr(jsi_api, jsi_context,
                                          name.c_str(), expr.c_str());
   maybe_throw_js_error(err);
 }
 
 
 void Scripter::SetVarReadOnly(const vxistring & name)
 {
   VXIjsiResult err = jsi_api->SetReadOnly(jsi_api, jsi_context,
                                           name.c_str());
   maybe_throw_js_error(err);
 }
 
 
 void Scripter::ClearVar(const vxistring & name)
 {
   VXIjsiResult err = jsi_api->SetVarExpr(jsi_api, jsi_context,
                                          name.c_str(), L"undefined");
   maybe_throw_js_error(err);
 }
 
 
 void Scripter::SetValue(const vxistring & var, const VXIValue * value)
 {
   VXIjsiResult err = jsi_api->SetVarValue(jsi_api, jsi_context,
                                           var.c_str(), value);
   maybe_throw_js_error(err);
 }
 
 
 VXIValue * Scripter::GetValue(const vxistring & name) const
 {
   VXIValue* val = NULL;
   VXIjsiResult err = jsi_api->GetVar(jsi_api, jsi_context, name.c_str(), &val);
 
   switch (err) {
   case VXIjsi_RESULT_FAILURE:         // ECMAScript type Null
   case VXIjsi_RESULT_NON_FATAL_ERROR: // ECMAScript type Undefined
   case VXIjsi_RESULT_SUCCESS:
     break;
   default:
     maybe_throw_js_error(err);
   }
 
   return val;
 }
 
 
 void Scripter::SetString(const vxistring & name, const vxistring & val)
 {
   vxistring line = val;
 
   // Normalize whitespace to ' '
   for (unsigned int i = 0; i < line.length(); ++i) {
     VXIchar c = line[i];
     if (c == '\n' || c == '\r' || c == '\t') line[i] = ' ';
   }
 
   // Escape the ' characters.
   const VXIchar APOSTROPHE = '\'';
   const VXIchar * const SLASH = L"\\";
 
   vxistring::size_type pos = line.find(APOSTROPHE);
   if (pos != vxistring::npos) {
     unsigned int size = line.length();
     do {
       line.insert(pos, SLASH);    // Convert ' -> \'
       if (++pos == size) break;   // Stop if last character was replaced.
       ++size;                     // Update the size.
       pos = line.find(APOSTROPHE, pos + 1);
     } while (pos != vxistring::npos);
   }
 
   // Pass the expression to ECMAScript.
   line = name + L" = '" + line + L"';";
   VXIjsiResult err = jsi_api->Eval(jsi_api, jsi_context, line.c_str(), NULL);
   maybe_throw_js_error(err);
 }
 
 
 void Scripter::PushScope(const vxistring & name, bool alias)
 {
   VXIjsiScopeAttr scopeAttr 
     = alias ? VXIjsi_ALIAS_SCOPE : VXIjsi_NATIVE_SCOPE;
 
   VXIjsiResult err = jsi_api->PushScope(jsi_api, jsi_context, name.c_str(),
                                         scopeAttr);
   if (err == VXIjsi_RESULT_SUCCESS)
     scopeStack.push_back(name);
 
   maybe_throw_js_error(err);
 }
 
 
 void Scripter::PopScope()
 {
   VXIjsiResult err = jsi_api->PopScope(jsi_api, jsi_context);
   if (err == VXIjsi_RESULT_SUCCESS)
     scopeStack.pop_back();
 
   maybe_throw_js_error(err);
 }
 
 
 bool Scripter::CurrentScope(const vxistring & name) const
 {
   return name == scopeStack.back();
 }
 
 
 bool Scripter::IsVarDefined(const vxistring & name)
 {
   switch (jsi_api->CheckVar(jsi_api, jsi_context, name.c_str())) {
   case VXIjsi_RESULT_SUCCESS:
     return true;
   case VXIjsi_RESULT_NON_FATAL_ERROR:    
   case VXIjsi_RESULT_FAILURE:
     return false;
   default:
     throw VXIException::JavaScriptError();
   }
 
   // We should never get here.
   return false;
 }
 
 
 bool Scripter::IsVarDeclared(const vxistring & name)
 {
   switch (jsi_api->CheckVar(jsi_api, jsi_context, name.c_str())) {
   case VXIjsi_RESULT_FAILURE:
   case VXIjsi_RESULT_SUCCESS:
     return true;
   case VXIjsi_RESULT_NON_FATAL_ERROR:    
     return false;
   default:
     throw VXIException::JavaScriptError();
   }
 
   // We should never get here.
   return false;
 }
 
 
 bool Scripter::TestCondition(const vxistring & script)
 {
   return (EvalScriptToInt(script) != 0);
 }
 
 
 VXIint Scripter::EvalScriptToInt(const vxistring & expr)
 {
   VXIValue* val = NULL;
   VXIjsiResult err = jsi_api->Eval(jsi_api, jsi_context, expr.c_str(), &val);
 
   VXIint result;
 
   if (err == VXIjsi_RESULT_SUCCESS) {
     switch (VXIValueGetType(val)) {
     case VALUE_STRING: {
       const VXIchar* s = 
             VXIStringCStr(reinterpret_cast<const VXIString*>(val));
       result = ((s != NULL && *s != L'\0') ? 1 : 0);      
     } break;
     case VALUE_BOOLEAN:
       result = VXIint(VXIBooleanValue(reinterpret_cast<const VXIBoolean*>(val)));
       break;
     case VALUE_INTEGER:
       result = VXIIntegerValue(reinterpret_cast<const VXIInteger*>(val));
       break;
     case VALUE_FLOAT: {
       // Convert float down to VXIint.
       // For GCC 3.2.2, convert float to int not correctly produce result
       // therefore we must cast to unsigned long first
 #if defined(__GNUC__) && ((__GNUC__ >= 3) && (__GLIBCPP__ >= 20030205))
       result = VXIint(VXIulong(VXIFloatValue(reinterpret_cast<const VXIFloat*>(val))));
 #else
       result = VXIint(VXIFloatValue(reinterpret_cast<const VXIFloat*>(val)));
 #endif
     } break;
     case VALUE_MAP: {
       // if the map is not empty, return 1
       result = 0;
       const VXIMap* temp = reinterpret_cast<const VXIMap*>(val);
       if( temp && (VXIMapNumProperties(temp) > 0) ) result = 1;
     } break;
     default:
       err = VXIjsi_RESULT_FAILURE;
       break;
     }
   }
 
   VXIValueDestroy(&val);
   maybe_throw_js_error(err);
 
   return result;
 }
 
 
 void Scripter::EvalScriptToString(const vxistring & expr, vxistring & result)
 {
   VXIValue * val = NULL;
   VXIjsiResult err = jsi_api->Eval(jsi_api, jsi_context, expr.c_str(), &val);
 
   std::basic_ostringstream<wchar_t> os;
 
   if (err == VXIjsi_RESULT_SUCCESS) {
     switch (VXIValueGetType(val)) {
     case VALUE_BOOLEAN:
       if(VXIBooleanValue(reinterpret_cast<const VXIBoolean*>(val)) == TRUE)
         os << L"true";
       else
         os << L"false";
       break;
     case VALUE_INTEGER:
       os << VXIIntegerValue(reinterpret_cast<const VXIInteger*>(val));
       break;
     case VALUE_FLOAT:
       os << VXIFloatValue(reinterpret_cast<const VXIFloat*>(val));
       break;
     case VALUE_STRING:
       std::fixed(os);
       os << VXIStringCStr(reinterpret_cast<const VXIString *>(val));
       break;
     default:
       err = VXIjsi_RESULT_FAILURE;
       break;
     }
   }
 
   VXIValueDestroy(&val);
   result = os.str();
 
   maybe_throw_js_error(err);
 }
 
 
 void Scripter::EvalScript(const vxistring & expr)
 {
   VXIjsiResult err = jsi_api->Eval(jsi_api, jsi_context, expr.c_str(), NULL);
   maybe_throw_js_error(err);
 }
 
 
 VXIValue * Scripter::EvalScriptToValue(const vxistring & expr)
 {
   VXIValue* val = NULL;
   VXIjsiResult err = jsi_api->Eval(jsi_api, jsi_context, expr.c_str(), &val);
   if (err == VXIjsi_RESULT_FAILURE) return NULL;  // from ECMAScript 'null'
   maybe_throw_js_error(err);
   return val;
 }