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| import haxe.macro.Expr; | |
| import haxe.macro.Context; | |
| using Lambda; | |
| @:autoBuild(AbstractClassBuilder.build()) | |
| interface AbstractClass {} | |
| class AbstractClassBuilder { | |
| static var abstractFields:Hash<Array<String>> = new Hash(); | |
| static public function build():Array<Field> { | |
| var fields = Context.getBuildFields(); | |
| var cls = Context.getLocalClass(); | |
| if (!abstractFields.exists(cls.toString())){ | |
| abstractFields.set(cls.toString(), []); | |
| } | |
| var absFields = abstractFields.get(cls.toString()); | |
| //Get all the abstract methods of super class. It should also force building super class first. | |
| var supCls = cls.get().superClass; | |
| if (supCls != null && abstractFields.exists(supCls.t.toString())) { | |
| for (f in abstractFields.get(supCls.t.toString())) { | |
| absFields.push(f); | |
| } | |
| } | |
| var publicCtorPos = null; //place holder for finding a public constructor | |
| for (f in fields) { | |
| if (f.access.has(AStatic)) continue; //we only care non-static methods | |
| switch (f.kind) { | |
| case FFun(fun): | |
| if (fun.expr == null) { //method without an implementation | |
| absFields.push(f.name); | |
| //give a method body so it compiles | |
| fun.expr = macro return throw "abstract method, must override"; | |
| } else { //method with an implementation | |
| absFields.remove(f.name); | |
| } | |
| if (f.name == "new" && f.access.has(APublic)) { | |
| publicCtorPos = f.pos; | |
| } | |
| default: | |
| } | |
| } | |
| if (absFields.length > 0 && publicCtorPos != null) { | |
| Context.error("Abstract class cannot have public constructor. Missing implementation of: " + absFields.join(", "), publicCtorPos); | |
| } | |
| return fields; | |
| } | |
| } |
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| class Color implements AbstractClass { | |
| public function toRGBX():RGBX; | |
| public function clone():Color; | |
| } | |
| class RGBX { | |
| public function new(){} | |
| } | |
| // class HSB extends Color { | |
| // public function new(){} //src/Main.hx:12: characters 8-24 : Abstract class cannot have public constructor. Missing implementation of: toRGBX, clone | |
| // } | |
| class HSL extends Color { | |
| public function new(){} | |
| override public function toRGBX():RGBX return new RGBX() | |
| override public function clone():HSL return new HSL() | |
| } | |
| class Main { | |
| static public function main() { | |
| var h = new HSL(); | |
| var r = h.toRGBX(); | |
| } | |
| } |
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