cleanup

src/errors.zig

@@ -14,7 +14,8 @@ pub const SourceLoc = struct {
     pub fn compute(source: []const u8, byte_offset: u32) SourceLoc {
         var line: u32 = 1;
         var col: u32 = 1;
-        for (source[0..byte_offset]) |c| {
+        const end = @min(byte_offset, @as(u32, @intCast(source.len)));
+        for (source[0..end]) |c| {
             if (c == '\n') {
                 line += 1;
                 col = 1;
@@ -93,4 +94,20 @@ pub const DiagnosticList = struct {
             }
         }
     }
+
+    pub fn renderDebug(self: *const DiagnosticList) void {
+        for (self.items.items) |d| {
+            const level_str = switch (d.level) {
+                .err => "error",
+                .warn => "warning",
+                .note => "note",
+            };
+            if (d.span) |span| {
+                const loc = SourceLoc.compute(self.source, span.start);
+                std.debug.print("{s}:{d}:{d}: {s}: {s}\n", .{ self.file_name, loc.line, loc.col, level_str, d.message });
+            } else {
+                std.debug.print("{s}: {s}: {s}\n", .{ self.file_name, level_str, d.message });
+            }
+        }
+    }
 };