public EventOperationCodeGen(CodeGenerator cg, EventBindingInfo bindingInfo)
{
this.cg = cg;
this.bindingInfo = bindingInfo;
var eventInfo = this.bindingInfo.eventInfo;
var declaringType = eventInfo.DeclaringType;
this.cg.cs.AppendLine("var op = js_parse_event_op(ctx, argv[0]);");
var caller = this.cg.AppendGetThisCS(bindingInfo);
var eventTypeName = this.cg.bindingManager.GetCSTypeFullName(eventInfo.EventHandlerType);
this.cg.cs.AppendLine("{0} value;", eventTypeName);
this.cg.cs.AppendLine("switch(op)");
using (this.cg.cs.CodeBlockScope())
{
this.cg.cs.AppendLine("case EVT_OP_ADD:");
using (this.cg.cs.IndentBlockScope())
{
var getter = this.cg.bindingManager.GetScriptObjectGetter(eventInfo.EventHandlerType, "ctx", "argv[1]", "value");
this.cg.cs.AppendLine("if (!{0})", getter);
using (this.cg.cs.CodeBlockScope())
{
this.cg.WriteParameterException(declaringType, eventInfo.Name, eventTypeName, 1);
}
this.cg.cs.AppendLine("{0}.{1} += value;", caller, eventInfo.Name);
this.cg.cs.AppendLine("break;");
}
this.cg.cs.AppendLine("case EVT_OP_REMOVE:");
using (this.cg.cs.IndentBlockScope())
{
var getter = this.cg.bindingManager.GetScriptObjectGetter(eventInfo.EventHandlerType, "ctx", "argv[1]", "value");
this.cg.cs.AppendLine("if (!{0})", getter);
using (this.cg.cs.CodeBlockScope())
{
this.cg.WriteParameterException(declaringType, eventInfo.Name, eventTypeName, 1);
}
this.cg.cs.AppendLine("{0}.{1} -= value;", caller, eventInfo.Name);
this.cg.cs.AppendLine("break;");
}
this.cg.cs.AppendLine("default: throw new JSException(\"invalid event op\");");
}
if (declaringType.IsValueType && !eventInfo.GetAddMethod().IsStatic)
{
// 非静态结构体属性修改, 尝试替换实例
this.cg.cs.AppendLine($"js_rebind_this(ctx, this_obj, ref {caller});");
}
this.cg.cs.AppendLine("return JSApi.JS_UNDEFINED;");
}
public string AppendGetThisCS(EventBindingInfo bindingInfo)
{
var isStatic = bindingInfo.isStatic;
var declaringType = bindingInfo.declaringType;
var caller = "";
if (isStatic)
{
caller = this.bindingManager.GetCSTypeFullName(declaringType, false);
}
else
{
caller = "self";
this.cs.AppendLine($"{this.bindingManager.GetCSTypeFullName(declaringType)} {caller};");
var getter = this.bindingManager.GetScriptObjectGetter(declaringType, "ctx", "this_obj", caller);
this.cs.AppendLine("{0};", getter);
}
return(caller);
}