From 8c5214df39ab82c3d42ccd492d8699f8a5aadb0a Mon Sep 17 00:00:00 2001
From: Anhgelus Morhtuuzh <william@herges.fr>
Date: Sat, 18 Apr 2026 20:21:10 +0200
Subject: feat(ast): test errors

---
 src/parser.zig | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

(limited to 'src/parser.zig')

diff --git a/src/parser.zig b/src/parser.zig
index 5f8c676..af571d4 100644
--- a/src/parser.zig
+++ b/src/parser.zig
@@ -7,9 +7,8 @@ const paragraph = @import("paragraph.zig");
 const title = @import("title.zig");
 
 pub const Error = error{
-    InvalidSequence,
     FeatureNotSupported,
-} || Lexer.Error || paragraph.Error;
+} || Lexer.Error || paragraph.Error || title.Error;
 
 pub fn parse(parent: Allocator, content: []const u8) Error![]const u8 {
     var arena = std.heap.ArenaAllocator.init(parent);
@@ -19,20 +18,21 @@ pub fn parse(parent: Allocator, content: []const u8) Error![]const u8 {
     var elements = try std.ArrayList(Element).initCapacity(alloc, 2);
 
     var l = try Lexer.init(content);
-    while (l.nextKind()) |it| {
+    base: while (l.nextKind()) |it| {
         try elements.append(alloc, switch (it) {
             .literal, .bold, .italic, .code => try paragraph.parse(alloc, &l),
             .title => try title.parse(alloc, &l),
             .weak_delimiter, .strong_delimiter => {
                 var v = (try l.next(alloc)).?;
                 v.deinit();
-                continue;
+                continue :base;
             },
             else => return Error.FeatureNotSupported,
         });
     }
 
     var res = try std.ArrayList(u8).initCapacity(parent, elements.items.len);
+    errdefer res.deinit(parent);
     for (elements.items) |it| {
         var v = it;
         try res.appendSlice(parent, try v.render(alloc));
@@ -49,6 +49,11 @@ fn doTest(alloc: Allocator, t: []const u8, v: []const u8) !void {
     };
 }
 
+fn doTestError(alloc: Allocator, t: []const u8, err: Error) !void {
+    _ = parse(alloc, t) catch |e| return std.testing.expect(err == e);
+    return std.testing.expect(false);
+}
+
 test "parse paragraphs" {
     var arena = std.heap.DebugAllocator(.{}).init;
     defer if (arena.deinit() == .leak) std.debug.print("leaking!\n", .{});
@@ -65,13 +70,17 @@ test "parse paragraphs" {
         \\foo bar
         \\in new paragraph
     , "<p>hello world</p><p>foo bar in new paragraph</p>");
+
+    try doTestError(alloc, "hello *world", Error.ModifierNotClosed);
+    try doTestError(alloc, "hello *wo_rld*", Error.ModifierNotClosed);
+    try doTestError(alloc, "*hell*o *wo_rld*", Error.ModifierNotClosed);
 }
 
 test "parse title" {
     var arena = std.heap.DebugAllocator(.{}).init;
     defer if (arena.deinit() == .leak) std.debug.print("leaking!\n", .{});
     const alloc = arena.allocator();
-    
+
     try doTest(alloc, "# hey", "<h1>hey</h1>");
     try doTest(alloc, "## hey", "<h2>hey</h2>");
     try doTest(alloc, "### hey", "<h3>hey</h3>");
@@ -82,4 +91,6 @@ test "parse title" {
         \\## subtitle
         \\hehe
     , "<h1>title</h1><p>hello world ;3</p><h2>subtitle</h2><p>hehe</p>");
+
+    try doTestError(alloc, "# aa :::", Error.InvalidTitleContent);
 }
-- 
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