Enhance ZON parser to support tuples and update documentation

- Modify parser to handle ZON tuples (`.{ 1, 2, 3 }`) as arrays
- Update README with more detailed explanation of ZON tuple syntax
- Add multiple example ZON files demonstrating tuple usage
- Implement tuple parsing in `parser.py`
- Add test case for tuple parsing

README.md

@@ -92,12 +92,14 @@ pytest --cov=zig_fetch_py --cov-report=html
 
 Zig Object Notation (ZON) is a data format used by the Zig programming language. It's similar to JSON but with some differences in syntax:
 
-- Objects are defined with `.{ ... }`
+- Objects (anonymous structs) are defined with `.{ .key = value, ... }`
 - Keys are prefixed with a dot: `.key = value`
-- Arrays are defined with `.[ ... ]`
+- Tuples are defined with `.{value1, value2, ...}` and are parsed as arrays in JSON
 - Special identifiers can be quoted with `@`: `.@"special-name" = value`
 - Comments use `//` syntax
 
+Note: ZON doesn't have a dedicated array syntax like JSON's `[]`. Instead, tuples (`.{value1, value2, ...}`) serve a similar purpose and are converted to arrays in JSON.
+
 Example:
 
 ```zon
@@ -110,7 +112,8 @@ Example:
             .hash = "abcdef123456",
         },
     },
-    .tags = .["tag1", "tag2"],
+    .tags = .{1, 2, 3},     // Tuple (parsed as array in JSON)
+    .paths = .{""},         // Single-item tuple
 }
 ```
 

examples/example.zon

@@ -7,5 +7,5 @@
             .hash = "abcdef123456",
         },
     },
-    .tags = .["tag1", "tag2"],
+    .tags = .{ "tag1", "tag2" },
 }

examples/nested_test.zon

@@ -0,0 +1,14 @@
+.{
+    .simple_object = .{
+        .x = 1,
+        .y = 2,
+    },
+    .simple_tuple = .{ 1, 2, 3 },
+    .nested_object = .{
+        .nested = .{
+            .a = 1,
+            .b = 2,
+        },
+    },
+    .nested_tuple = .{ .{ 1, 2 }, .{ 3, 4 } },
+}

examples/simple.zon

@@ -0,0 +1,6 @@
+.{
+    .name = "example",
+    .version = "1.0.0",
+    .numbers = .{ 1, 2, 3 },
+    .strings = .{ "one", "two", "three" },
+}

examples/simple_nested.zon

@@ -0,0 +1,4 @@
+.{
+    .simple_tuple = .{ 1, 2, 3 },
+    .nested_tuple = .{ .{ 1, 2 }, .{ 3, 4 } },
+}

examples/tuple_test.zon

@@ -0,0 +1,6 @@
+.{
+    .simple_tuple = .{ 1, 2, 3 },
+    .string_tuple = .{ "one", "two", "three" },
+    .empty_tuple = .{""},
+    .mixed_tuple = .{ 1, "two", true },
+}

examples/zig_tuples.zon

@@ -0,0 +1,22 @@
+.{
+    // Object with field values
+    .metadata = .{
+        .name = "example",
+        .version = "1.0.0",
+    },
+
+    // Tuples of different types
+    .numbers = .{ 1, 2, 3 },
+    .strings = .{ "one", "two", "three" },
+    .mixed = .{ 1, "two", true, null },
+    .empty_string = .{""},
+
+    // Nested structures
+    .nested = .{
+        .tuple_in_object = .{ 4, 5, 6 },
+        .object_in_tuple = .{ .{ .x = 1, .y = 2 }, .{ .x = 3, .y = 4 } },
+    },
+
+    // Empty tuple
+    .empty = .{},
+}

tests/test_parser.py

@@ -151,6 +151,24 @@ class TestZonParser:
             )
             parser.parse()
 
+    def test_parse_tuple(self):
+        """Test parsing tuples."""
+        parser = ZonParser(
+            """.{
+            .simple_tuple = .{1, 2, 3},
+            .string_tuple = .{"one", "two", "three"},
+            .empty_tuple = .{""},
+            .mixed_tuple = .{1, "two", true},
+        }"""
+        )
+        result = parser.parse()
+        assert result == {
+            "simple_tuple": [1, 2, 3],
+            "string_tuple": ["one", "two", "three"],
+            "empty_tuple": [""],
+            "mixed_tuple": [1, "two", True],
+        }
+
 
 class TestZonFileParser:
     """Test cases for the file parsing functions."""

zig_fetch_py/parser.py

@@ -78,14 +78,10 @@ class ZonParser:
         if char == ".":
             self._next_char()  # Skip the dot
 
-            # Check if it's an object
+            # Check if it's an object or tuple
             if self._current_char() == "{":
                 return self._parse_object()
 
-            # Check if it's an array
-            if self._current_char() == "[":
-                return self._parse_array()
-
             # It's a field name or a special value
             return self._parse_identifier()
 
@@ -103,12 +99,36 @@ class ZonParser:
                 f"Unexpected character '{char}' at line {self.line}, column {self.col}"
             )
 
-    def _parse_object(self) -> Dict[str, Any]:
-        result = {}
-
+    def _parse_object(self) -> Union[Dict[str, Any], List[Any]]:
+        """Parse a ZON object (anonymous struct) or tuple."""
         # Skip the opening brace
         self._next_char()
 
+        # Check if it's a tuple (values separated by commas without keys)
+        is_tuple = False
+        pos_before_check = self.pos
+        line_before_check = self.line
+        col_before_check = self.col
+
+        # Look ahead to see if this is a tuple
+        self._skip_whitespace_and_comments()
+        if self._current_char() != ".":
+            # If it doesn't start with a dot for a key, it might be a tuple
+            # or an empty object
+            if self._current_char() != "}":
+                is_tuple = True
+
+        # Reset position after look-ahead
+        self.pos = pos_before_check
+        self.line = line_before_check
+        self.col = col_before_check
+
+        if is_tuple:
+            return self._parse_tuple()
+
+        # Regular object parsing
+        result = {}
+
         while True:
             self._skip_whitespace_and_comments()
 
@@ -151,21 +171,33 @@ class ZonParser:
 
         return result
 
-    def _parse_array(self) -> List[Any]:
+    def _parse_tuple(self) -> List[Any]:
+        """Parse a tuple in ZON format."""
         result = []
 
-        # Skip the opening bracket
-        self._next_char()
-
         while True:
             self._skip_whitespace_and_comments()
 
-            # Check for closing bracket
-            if self._current_char() == "]":
+            # Check for closing brace
+            if self._current_char() == "}":
                 self._next_char()
                 break
 
-            # Parse value
+            # Check for nested tuple or object with dot prefix
+            if self._current_char() == ".":
+                self._next_char()  # Skip the dot
+
+                # Check if it's a nested object or tuple
+                if self._current_char() == "{":
+                    value = self._parse_object()
+                    result.append(value)
+                else:
+                    # It's a field name or a special value
+                    self.pos -= 1  # Move back to include the dot
+                    value = self._parse_value()
+                    result.append(value)
+            else:
+                # Regular value
                 value = self._parse_value()
                 result.append(value)
 
@@ -174,9 +206,9 @@ class ZonParser:
             # Check for comma
             if self._current_char() == ",":
                 self._next_char()
-            elif self._current_char() != "]":
+            elif self._current_char() != "}":
                 raise ValueError(
-                    f"Expected ',' or ']' at line {self.line}, column {self.col}"
+                    f"Expected ',' or '}}' at line {self.line}, column {self.col}"
                 )
 
         return result