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fix: make conditional fields optional using @hasField

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Templates can now use 'if error' or similar conditionals without
requiring the caller to always provide those fields in the data struct.
This commit is contained in:
Ankit Patial
2026-01-23 12:10:48 +05:30
parent 4f1dcf3640
commit 53f147f5c4
3 changed files with 15 additions and 4 deletions
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2
build.zig.zon
View File

@@ -1,6 +1,6 @@
.{
.name = .pugz,
.version = "0.1.10",
.version = "0.1.11",
.fingerprint = 0x822db0790e17621d, // Changing this has security and trust implications.
.minimum_zig_version = "0.15.2",
.dependencies = .{},

4
examples/demo/views/generated.zig
View File

@@ -143,7 +143,7 @@ pub fn home(a: Allocator, d: anytype) Allocator.Error![]u8 {
try o.appendSlice(a, "</title><link rel=\"stylesheet\" href=\"/style.css\" /></head><body><header><h1>");
try esc(&o, a, strVal(@field(d, "title")));
try o.appendSlice(a, "</h1>");
if (truthy(@field(d, "authenticated"))) {
if (@hasField(@TypeOf(d), "authenticated") and truthy(@field(d, "authenticated"))) {
try o.appendSlice(a, "<span class=\"user\">Welcome back!</span>");
}
try o.appendSlice(a, "</header><main><p>This page is rendered using a compiled template.</p><p>Compiled templates are 3x faster than Pug.js!</p></main><footer><p>&copy; 2024 Pugz Demo</p></footer></body></html>");
@@ -209,7 +209,7 @@ pub fn page_a(a: Allocator, d: anytype) Allocator.Error![]u8 {
try o.appendSlice(a, " /></fieldset>");
}
try o.appendSlice(a, "<submit>sumit</submit>");
if (truthy(@field(d, "error"))) {
if (@hasField(@TypeOf(d), "error") and truthy(@field(d, "error"))) {
{
const message = @field(d, "error");
const mixin_attrs_1: struct {

13
src/build_templates.zig
View File

@@ -1254,7 +1254,18 @@ const Compiler = struct {
// Regular field access - use buildAccessor for consistency
var accessor_buf: [512]u8 = undefined;
const accessor = self.buildAccessor(cond, &accessor_buf);
try self.writer.print("truthy({s})", .{accessor});
// Check if this is a simple top-level field access (no dots, not a loop var or mixin param)
const is_simple_field = std.mem.indexOfScalar(u8, cond, '.') == null and
!self.isLoopVar(cond) and !self.isMixinParam(cond);
if (is_simple_field) {
// Use @hasField to make the field optional at compile time
self.uses_data = true;
try self.writer.print("@hasField(@TypeOf(d), \"{s}\") and truthy({s})", .{ cond, accessor });
} else {
try self.writer.print("truthy({s})", .{accessor});
}
}
fn emitEach(self: *Compiler, e: ast.Each) anyerror!void {