feat: serialize ErrorLabel to json

src/errors/error_label.zig

@@ -0,0 +1,61 @@
+const std = @import("std");
+
+pub const ErrorLabel = struct {
+    message: []const u8,
+    start: usize,
+    end: usize,
+
+    /// Converts this struct into JSON
+    pub fn json(self: ErrorLabel, alloc: std.mem.Allocator) ![]u8 {
+        return try std.json.stringifyAlloc(alloc, .{
+            .message = self.message,
+            .start = self.start,
+            .end = self.end,
+        }, .{});
+    }
+};
+
+test "should serialize" {
+    const label = ErrorLabel{
+        .message = "Error",
+        .start = 5,
+        .end = 6,
+    };
+    const json_str = try label.json(std.testing.allocator);
+    defer std.testing.allocator.free(json_str);
+
+    const expected =
+        \\{"message":"Error","start":5,"end":6}
+    ;
+    try std.testing.expectEqualStrings(expected, json_str);
+}
+
+test "should handle special characters" {
+    const label = ErrorLabel{
+        .message = "Error\"with\"quotes",
+        .start = 0,
+        .end = 1,
+    };
+    const json_str = try label.json(std.testing.allocator);
+    defer std.testing.allocator.free(json_str);
+
+    const expected =
+        \\{"message":"Error\"with\"quotes","start":0,"end":1}
+    ;
+    try std.testing.expectEqualStrings(expected, json_str);
+}
+
+test "should serialize empty message" {
+    const label = ErrorLabel{
+        .message = "",
+        .start = 0,
+        .end = 0,
+    };
+    const json_str = try label.json(std.testing.allocator);
+    defer std.testing.allocator.free(json_str);
+
+    const expected =
+        \\{"message":"","start":0,"end":0}
+    ;
+    try std.testing.expectEqualStrings(expected, json_str);
+}

src/errors/root.zig

@@ -1,10 +1,5 @@
 const std = @import("std");
-
-pub const ErrorLabel = struct {
-    message: []const u8,
-    start: usize,
-    end: usize,
-};
+pub const ErrorLabel = @import("./error_label.zig").ErrorLabel;
 
 /// Holds information about errors generated during the compilation,
 /// and pretty prints them.
@@ -158,6 +153,12 @@ pub const ErrorData = struct {
     // - Get previous, current and next line
     // - Display message
 
+    /// Transform this error into a JSON
+    pub fn json(alloc: std.mem.Allocator) void {
+        _ = alloc;
+        std.debug.panic(":c");
+    }
+
     pub fn deinit(self: *@This()) void {
         self.labels.deinit();
     }