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Experimental @bind support [Discussion] #31

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Experimental @bind support [Discussion] #31

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9739d7d
added experimental @bind support
rcstuber Jun 29, 2021
b03ccc8
- removed default logic for bind (now implemented by user through `pr…
rcstuber Jul 1, 2021
a1adfcc
removed test sample
rcstuber Jul 1, 2021
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68 changes: 64 additions & 4 deletions domkit/Macros.hx
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,11 @@ package domkit;
#if macro
import haxe.macro.Context;
import haxe.macro.Expr;
import haxe.macro.Type;
import domkit.Error;

using haxe.macro.Tools;
using haxe.macro.ExprTools;

typedef ComponentData = {
var declaredIds : Map<String,Bool>;
Expand All @@ -27,6 +30,10 @@ class Macros {
public static dynamic function processMacro( id : String, args : Null<Array<haxe.macro.Expr>>, pos : haxe.macro.Expr.Position ) : MarkupParser.Markup {
return null;
}

public static dynamic function processBind( e : haxe.macro.Expr ) : haxe.macro.Expr {
return null;
}

public static function registerComponentsPath( path : String ) {
if( componentsSearchPath.indexOf(path) < 0 )
Expand Down Expand Up @@ -104,9 +111,46 @@ class Macros {
}
}

static function remapBind( rootExpr : haxe.macro.Expr ) {
var isBound = false;
var bname:String = null;
var bindExprs:Array<haxe.macro.Expr> = [];
function _remap(e : haxe.macro.Expr) {
switch( e.expr ) {
case EMeta(m, group) if( m.name == "bind" ):
if(m.params.length > 0)
switch(m.params[0].expr) {
case EConst(CIdent(name)):
bname = name;
default:
}
isBound = true;
_remap(group);
e.expr = group.expr;
return;
case EConst(CIdent(name)) if(isBound):
var b = macro domkit.Macros.bindVar($i{name});
bindExprs.push(b);
return;
case EField(obj, name) if(isBound):
var b = macro domkit.Macros.bindVar($obj.$name);
bindExprs.push(b);
return;
default:
}
e.iter(_remap);
}
_remap(rootExpr);
return {
isBound: isBound,
name: bname,
exprs: bindExprs
};
}

static var latestBlock : Array<Expr> = null;

static function remapBuild( e : haxe.macro.Expr ) {
static function remapBuild( e : haxe.macro.Expr) {
switch( e.expr ) {
case EMeta(m, expr) if( m.name == "rebuild" ):
switch( expr.expr ) {
Expand Down Expand Up @@ -261,10 +305,23 @@ class Macros {
} else
error("Unknown property "+comp.name+"."+p.name, attr.vmin, attr.pmax);
} else {
aexprs.push(macro var __attrib = $e);
var binding = remapBind(e);
var eattrib = { expr : EConst(CIdent("__attrib")), pos : e.pos };
aexprs.push({ expr : EMeta({ pos : e.pos, name : ":privateAccess" }, { expr : ECall(withPos(eset,e.pos),[macro cast tmp.obj,eattrib]), pos : e.pos }), pos : e.pos });
aexprs.push(macro @:privateAccess tmp.initStyle($v{p.name},$eattrib));
var setter = { expr : ECall(withPos(eset,e.pos),[macro cast tmp.obj,eattrib]), pos : e.pos };
aexprs.push(macro {
function __onVarChanged() {
var __attrib = $e;
@:privateAccess $setter;
@:privateAccess tmp.initStyle($v{p.name},$eattrib);
}
$b{binding.exprs};
$e{
if(binding.isBound)
macro registerBind(__onVarChanged, $v{binding.name})
else macro {}
}
__onVarChanged();
});
}
}
}
Expand Down Expand Up @@ -596,4 +653,7 @@ class Macros {

#end

public static macro function bindVar(e : haxe.macro.Expr) : haxe.macro.Expr {
return processBind(e);
}
}