From c4b25e96458545a9ad2b70e3c14ddf523eb78a7d Mon Sep 17 00:00:00 2001
From: "Adam D. Ruppe" <destructionator@gmail.com>
Date: Fri, 8 May 2020 14:28:39 -0400
Subject: [PATCH] const(int) arg support. i think

---
 jsvar.d | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 70 insertions(+), 2 deletions(-)

diff --git a/jsvar.d b/jsvar.d
index 96a9f60..cd816ae 100644
--- a/jsvar.d
+++ b/jsvar.d
@@ -675,16 +675,26 @@ struct var {
 				var ret;
 
 				ParameterTypeTuple!T fargs;
+
+				// FIXME: default args?
+				enum lol = static_foreach(fargs.length, 1, -1,
+					`t(`,
+						``, ` < args.length ? args[`,`].get!(typeof(fargs[`,`])) : typeof(fargs[`,`]).init,`,
+					`)`);
+				/+
 				foreach(idx, a; fargs) {
 					if(idx == args.length)
 						break;
 					cast(Unqual!(typeof(a))) fargs[idx] = args[idx].get!(typeof(a));
 				}
+				+/
 
 				static if(is(ReturnType!t == void)) {
-					t(fargs);
+					//t(fargs);
+					mixin(lol ~ ";");
 				} else {
-					ret = t(fargs);
+					//ret = t(fargs);
+					ret = mixin(lol);
 				}
 
 				return ret;
@@ -2322,3 +2332,61 @@ bool appearsNumeric(string n) {
 WrappedNativeObject wrapNativeObject(Struct)(Struct* obj) if(is(Struct == struct)) {
 	return null; // FIXME
 }
+
+private
+string static_foreach(size_t length, int t_start_idx, int t_end_idx, string[] t...) pure {
+	assert(__ctfe);
+	int slen;
+	int tlen;
+	foreach(idx, i; t[0 .. t_start_idx])
+		slen += i.length;
+	foreach(idx, i; t[t_start_idx .. $ + t_end_idx]) {
+		if(idx)
+			tlen += 5;
+		tlen += i.length;
+	}
+	foreach(idx, i; t[$ + t_end_idx .. $])
+		slen += i.length;
+
+	char[] a = new char[](tlen * length + slen);
+
+	int loc;
+	char[5] stringCounter;
+	stringCounter[] = "00000"[];
+
+	foreach(part; t[0 .. t_start_idx]) {
+		a[loc .. loc + part.length] = part[];
+		loc += part.length;
+	}
+
+	foreach(i; 0 .. length) {
+		foreach(idx, part; t[t_start_idx .. $ + t_end_idx]) {
+			if(idx) {
+				a[loc .. loc + stringCounter.length] = stringCounter[];
+				loc += stringCounter.length;
+			}
+			a[loc .. loc + part.length] = part[];
+			loc += part.length;
+		}
+
+		auto pos = stringCounter.length;
+		while(pos) {
+			pos--;
+			if(stringCounter[pos] == '9') {
+				stringCounter[pos] = '0';
+			} else {
+				stringCounter[pos] ++;
+				break;
+			}
+		}
+		while(pos)
+			stringCounter[--pos] = ' ';
+	}
+
+	foreach(part; t[$ + t_end_idx .. $]) {
+		a[loc .. loc + part.length] = part[];
+		loc += part.length;
+	}
+
+	return a;
+}