refactor

src/template/lib.zig

@@ -4,15 +4,17 @@ pub fn main() !void {
     try execute(std.io.getStdOut().writer(), @embedFile("./test.tmp.html"), .{
         .community = .{ .name = "abcd" },
         .foo = [_][]const u8{ "5", "4", "3", "2", "1" },
+        .baz = [_][]const []const u8{
+            &.{ "5", "4", "3", "2", "1" },
+            &.{ "5", "4", "3", "2", "1" },
+        },
     });
 }
 
-const logging = false;
-
 pub fn execute(writer: anytype, comptime template: []const u8, args: anytype) !void {
     @setEvalBranchQuota(@intCast(u32, template.len * 6));
     const tmpl = comptime parseTemplate(TokenIter{ .text = template }, .root);
-    try executeTemplate(writer, tmpl.item, args, .{ .bar = "abc" });
+    try executeTemplate(writer, tmpl.item, args, .{});
 }
 
 fn executeTemplate(writer: anytype, comptime items: []const TemplateItem, args: anytype, captures: anytype) !void {
@@ -24,21 +26,13 @@ fn executeTemplate(writer: anytype, comptime items: []const TemplateItem, args:
 
 fn executeStatement(writer: anytype, comptime stmt: Statement, args: anytype, captures: anytype) !void {
     switch (stmt) {
-        .expression => |expr| switch (expr) {
-            .arg_deref => |fields| {
-                const arg = deref(args, fields);
-                try print(writer, arg);
-            },
-            .capture_deref => |fields| {
-                const arg = deref(captures, fields);
-                try print(writer, arg);
-            },
+        .expression => |expr| {
+            const val = evaluateExpression(expr, args, captures);
+            try print(writer, val);
         },
         .for_loop => |loop| {
-            const fields = loop.iterable.arg_deref;
-            const iterable = deref(args, fields);
+            const iterable = evaluateExpression(loop.iterable, args, captures);
             const subtemplate = loop.subtemplate;
-            try writer.writeAll("capture on " ++ loop.capture ++ ": ");
             for (iterable) |v| {
                 try executeTemplate(
                     writer,
@@ -54,6 +48,7 @@ fn executeStatement(writer: anytype, comptime stmt: Statement, args: anytype, ca
 
 fn print(writer: anytype, arg: anytype) !void {
     if (comptime std.meta.trait.isZigString(@TypeOf(arg))) return writer.writeAll(arg);
+    @compileLog(@TypeOf(arg));
 
     @compileError("TODO");
 }
@@ -74,6 +69,24 @@ fn deref(arg: anytype, comptime names: []const []const u8) Deref(@TypeOf(arg), n
     return deref(@field(arg, names[0]), names[1..]);
 }
 
+fn EvaluateExpression(comptime expression: Expression, comptime Args: type, comptime Captures: type) type {
+    return switch (expression) {
+        .arg_deref => |names| Deref(Args, names),
+        .capture_deref => |names| Deref(Captures, names),
+    };
+}
+
+fn evaluateExpression(
+    comptime expression: Expression,
+    args: anytype,
+    captures: anytype,
+) EvaluateExpression(expression, @TypeOf(args), @TypeOf(captures)) {
+    return switch (expression) {
+        .arg_deref => |names| deref(args, names),
+        .capture_deref => |names| deref(captures, names),
+    };
+}
+
 fn AddCapture(comptime Root: type, comptime name: []const u8, comptime Val: type) type {
     var fields = std.meta.fields(Root) ++ [_]std.builtin.Type.StructField{.{
         .name = name,
@@ -109,7 +122,6 @@ fn parseTemplate(comptime tokens: TokenIter, comptime template_type: TemplateTyp
         var current_text: []const u8 = "";
 
         parse_loop: while (iter.next()) |token| {
-            if (logging) @compileLog(token);
             switch (token) {
                 .whitespace, .text => |text| current_text = current_text ++ text,
                 .open_bracket => {

src/template/test.tmp.html

@@ -9,12 +9,8 @@
     <h2> {{ REAL BRACKETS }} </h2>
 
     <section>
-      {$bar}
-      {#for .foo |$f|}a testing thing: {$f} {#end_for}
-      {{#for args.notes |$note, $i|}}
-        <h3>Note no. {{$i}}</h3>
-        {{#template note_display ($note)}}
-      {{#end}}
+      {#for .baz |$f|}{#for $f |$b|}{$b}:{#end_for}
+      {#end_for}
     </section>
   </body>
 </html>