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Object construction with macro
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| import haxe.macro.Expr; | |
| import haxe.macro.Context; | |
| class GenNew { | |
| macro public static function build () : Array<Field> { | |
| var fields = Context.getBuildFields(); | |
| var args = []; | |
| var assigns = []; | |
| for (field in fields) { | |
| for (meta in field.meta) { | |
| if (meta.name == ":param") { | |
| switch (field.kind) { | |
| case FVar(t, e), FProp(_, _, t, e): | |
| args.push({ | |
| name: field.name, | |
| type: t, | |
| opt: false | |
| }); | |
| var name = field.name; | |
| assigns.push(macro this.$name = $i{name}); | |
| default: | |
| } | |
| } | |
| } | |
| } | |
| var f = { | |
| kind: FFun({ | |
| args: args, | |
| expr: { | |
| expr: EBlock(assigns), | |
| pos: Context.currentPos() | |
| }, | |
| params: [], | |
| ret: null | |
| }), | |
| name: "new", | |
| pos: Context.currentPos(), | |
| access: [APublic] | |
| }; | |
| fields.push(f); | |
| return fields; | |
| } | |
| } |
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| Run: | |
| haxe -main Test -x Test | |
| Output: | |
| Test.hx:7: 19,hello macro |
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| @:build(GenNew.build()) | |
| class NoConstructor { | |
| @:param public var i(default, null):Int; | |
| @:param private var s:String; | |
| public function show() { | |
| trace(i, s); | |
| } | |
| } | |
| class Test { | |
| public static function main() { | |
| var obj = new NoConstructor(19, "hello macro"); | |
| obj.show(); | |
| } | |
| } |
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