Result GetFirstElementByTagName(MSXML::IXMLDOMElementPtr& parent, const string& tagName, MSXML::IXMLDOMElementPtr& pEl)
{
Result r;
try
{
pEl = 0;
MSXML::IXMLDOMNodeListPtr pList = parent->getElementsByTagName(tagName.c_str());
if(pList == NULL)
{
r.Fail(Format("No '%' nodes found (pList = 0)").s(tagName).Str());
}
else
{
if(!pList->length)
{
r.Fail(Format("No '%' nodes found (length = 0)").s(tagName).Str());
}
else
{
pEl = pList->nextNode();
r.Succeed();
}
}
}
catch(_com_error& e)
{
r.Fail(Format("Com error: % %").s(e.ErrorMessage()).s(e.Description()).Str());
}
return r;
}
/*
* ----- main -----
*/
int main(int argc, char* argv[]) {
if ( argc != 2 ) {
cerr << "fsm <URL for FSM>" << endl;
return 1;
}
if ( FAILED(CoInitialize(0)) ) {
cerr << "Can't initialize COM" << endl;
return 1;
}
try {
/*
* XML Parser の生成と初期化
*/
MSXML::IXMLDOMDocumentPtr document("MSXML.DOMDocument");
document->validateOnParse = VARIANT_TRUE; // 検証を行う
document->async = VARIANT_FALSE; // Parse完了までloadメソッドをブロック
/*
* 引数に与えられたURLで示されたXMLをロードする
*/
document->load(argv[1]);
/*
* Parseエラーがあれば出力
*/
MSXML::IXMLDOMParseErrorPtr error = document->parseError;
if ( error->errorCode != 0 ) {
if ( error->line ) {
cerr << "line : " << error->line << endl;
cerr << "position : " << error->linepos << endl;
cerr << "source : " << (const char*)error->srcText << endl;
}
cerr << "URL : " << (const char*)error->url << endl;
cerr << "code : " << error->errorCode << endl;
cerr << "reason : " << (const char*)error->reason << endl;
return 1;
}
/*
* ルートエレメントを取得する
*/
MSXML::IXMLDOMElementPtr root = document->documentElement;
/*
* 全イベントを取り出す
*/
set<string> event_set;
MSXML::IXMLDOMNodeListPtr events = root->getElementsByTagName("Event");
for ( int i = 0; i < events->length; ++i ) {
MSXML::IXMLDOMElementPtr node = events->item[i];
event_set.insert(get_attribute(node,"name"));
}
/*
* 初期状態 / 終了状態 を取得する
*/
string state_name = get_attribute(root,"initial");
string terminal_name = get_attribute(root,"terminal");
string fsm_name = get_attribute(root,"name");
cout << "FSM : " << fsm_name << endl;
/*
* 状態遷移表を駆動する
*/
while ( state_name != terminal_name ) {
/*
* state_name で示される State を見つける
*/
MSXML::IXMLDOMElementPtr state = find_element(root,"name",state_name);
if ( state == 0 ) {
cerr << "can't find state : " << state_name << endl;
break;
}
/*
* 現在の状態とイベント一覧を出力する
*/
cout << "state : " << state_name << endl;
cout << "enter an event (";
copy(event_set.begin(), event_set.end(), ostream_iterator<string>(cout,","));
cout << "exit) ? " << flush;
/*
* ユーザからのイベント入力
*/
string event_name;
cin >> event_name;
if ( event_name == "exit" )
break;
if ( event_set.find(event_name) == event_set.end() ) {
cerr << event_name << " is not valid." << endl;
continue;
}
/*
* event_name で示される Event を見つける
*/
MSXML::IXMLDOMElementPtr event = find_element(state,"name",event_name);
if ( event == 0 ) {
cerr << "can't find event : " << event_name << endl;
break;
}
/*
* アクションを実行する
*/
string action_name = get_attribute(event,"action");
if ( action_name != "none" )
cout << "action : " << action_name << endl;
/*
* 次の状態へ遷移する
*/
string transition_name = get_attribute(event,"transition");
if ( transition_name != "none" )
state_name = transition_name;
}
} catch ( _com_error& ex ) {
cerr << "COM error occurred : " << ex.ErrorMessage() << endl;
}
CoUninitialize();
return 0;
}