ちょっと思うところあってv8 javascript engine（http://code.google.com/p/v8/）で遊んでみました。公式のドキュメントがだいぶ少ないのですが、いろんな人が2年くらい前に遊んでいたようなので情報は適度に転がっています。
ソースコード
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| // build) g++ v8_test.cc -o v8_test -lv8 | |
| #include <v8.h> | |
| #include <string> | |
| char * js_src = | |
| "function laugh() {" | |
| " print ('HAHAHA'); " | |
| "}; " | |
| "s = append ('echo');" | |
| "print (s);" | |
| "print ('I am ' + obj_test.name); " | |
| "obj_test.func ();"; | |
| v8::Handle<v8::Value> PrintArgs (const v8::Arguments &args) { | |
| v8::String::AsciiValue str(args[0]); | |
| printf ("[Print] '%s'\n", *str); | |
| return v8::Undefined (); | |
| } | |
| v8::Handle<v8::Value> PrintTest (const v8::Arguments &args) { | |
| printf ("[Print Test]\n"); | |
| return v8::Undefined (); | |
| } | |
| v8::Handle<v8::Value> AppendExclamation (const v8::Arguments &args) { | |
| v8::String::AsciiValue str(args[0]); | |
| std::string s (*str); | |
| s += "!!!"; | |
| return v8::String::New (s.c_str (), s.length()); | |
| } | |
| int main(int argc, char* argv[]) { | |
| v8::HandleScope handle_scope; | |
| v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New (); | |
| // install a original function to global context | |
| global->Set(v8::String::New ("print"), v8::FunctionTemplate::New (PrintArgs)); | |
| global->Set(v8::String::New ("append"), v8::FunctionTemplate::New (AppendExclamation)); | |
| // install a object to global context | |
| v8::Handle<v8::ObjectTemplate> obj = v8::ObjectTemplate::New (); | |
| obj->Set ("name", v8::String::New ("DROID")); | |
| obj->Set ("func", v8::FunctionTemplate::New (PrintTest)); | |
| global->Set ("obj_test", obj); | |
| // create a source code and compile | |
| v8::Handle<v8::String> source = v8::String::New(js_src); | |
| v8::Handle<v8::Primitive> undef = v8::Undefined (); | |
| v8::Persistent<v8::Context> context = v8::Context::New(NULL, global); | |
| v8::Context::Scope context_scope(context); | |
| v8::Handle<v8::Script> script = v8::Script::Compile(source, undef); | |
| v8::Handle<v8::Value> result = script->Run(); | |
| context.Dispose(); | |
| return 0; | |
| } |
実行結果
とりあえず、関数作ってJavaScript側から呼びだすところまでは完成。C++側でJavaScriptの関数を呼び出すところまでやりたいので、後日もうちょっと調べます。[Print] 'echo!!!' [Print] 'I am DROID' [Print Test]
参考文献
- V8 JavaScript Engine Getting Started http://code.google.com/intl/ja/apis/v8/get_started.html
- Google Chrome の JavaScript エンジン V8 を試す http://d.hatena.ne.jp/amachang/20080903/1220405193
- Embedder's Guide - V8 JavaScript Engine (日本語訳) http://javascript.g.hatena.ne.jp/edvakf/20100407/1270626241
- Using V8 - Google's Chrome JavaScript Virtual Machine http://www.codeproject.com/KB/library/Using_V8_Javascript_VM.aspx
