# Chichewa List Methods Implementation

## Overview
Successfully implemented localized Chichewa list methods for the Chi programming language. All English list methods have been replaced with proper Chichewa equivalents while maintaining full functionality.

## Implemented Chichewa Methods

| Chichewa Method | English Equivalent | Description | Usage Example |
|-----------------|-------------------|-------------|---------------|
| `onjezera(item)` | `append(item)` | Add item to end of list | `mylist.onjezera("item")` |
| `lowetsa(index, item)` | `insert(index, item)` | Insert item at specific index | `mylist.lowetsa(0, "item")` |
| `chotsa(item)` | `remove(item)` | Remove first occurrence of item | `mylist.chotsa("item")` |
| `tulutsa()` or `tulutsa(index)` | `pop()` or `pop(index)` | Remove and return item at index | `item = mylist.tulutsa()` |
| `funafuna(item)` | `index(item)` | Find index of first occurrence | `index = mylist.funafuna("item")` |
| `werengera(item)` | `count(item)` | Count occurrences of item | `count = mylist.werengera("item")` |

## Technical Implementation

### 1. Keywords Addition (`keywords.py`)
Added the following Chichewa method names to the KEYWORDS list:
```python
'onjezera',           # append - "to add"
'lowetsa',            # insert - "to put in" 
'chotsa',             # remove - "to take out"
'tulutsa',            # pop - "to pull out"
'funafuna',           # index - "to search/find"
'werengera',          # count - "to count"
```

### 2. Lexer Updates (`lexer.py`)
- Added dot (`.`) to PUNCTUATION token pattern for method calls
- Modified keyword recognition to keep method names as IDENTIFIERS instead of KEYWORDS

### 3. Parser Updates (`parser.py`)
- Added support for dot notation method calls in the `call()` method
- Implemented parsing for both method calls (`obj.method()`) and property access (`obj.property`)
- Added proper error handling for method call syntax

### 4. Interpreter Updates (`interpreter.py`)
- Added `MethodCall` expression class with Chichewa-to-English method mapping
- Added `PropertyAccess` expression class for future extensibility
- Implemented automatic integer conversion for index-based methods (`lowetsa`, `tulutsa`)
- Maintained full compatibility with existing `ChiList` class methods

## Language Features Maintained

✅ **Indexing**: `mylist[0]`, `mylist[-1]` (positive and negative indices)  
✅ **Iteration**: `bwereza item mu mylist:` (for loops)  
✅ **Creation**: `ika mylist = ndandanda("a", "b", "c")`  
✅ **All existing Chi language features**

## Example Usage

```chi
# Create a list
ika fruits = ndandanda("mango", "banana", "orange")

# Add items
fruits.onjezera("apple")                    # append
fruits.lowetsa(0, "pineapple")             # insert at beginning

# Find and count
ika position = fruits.funafuna("banana")    # get index
ika count = fruits.werengera("apple")       # count occurrences

# Remove items
ika removed = fruits.tulutsa()              # pop last
fruits.chotsa("orange")                     # remove by value

# Access with indexing
ika first = fruits[0]                       # positive index
ika last = fruits[-1]                       # negative index
```

## Benefits

1. **Full Localization**: No more English method names in user code
2. **Cultural Appropriateness**: All method names are meaningful in Chichewa
3. **Maintained Functionality**: All Python list operations available
4. **Backward Compatibility**: Existing indexing and iteration features preserved
5. **Extensible Design**: Easy to add more Chichewa methods in the future

## Files Modified

- `keywords.py` - Added Chichewa method keywords
- `lexer.py` - Updated tokenization for dot operator and method names
- `parser.py` - Added method call parsing support
- `interpreter.py` - Added MethodCall evaluation with mapping system

The implementation successfully removes all English method dependencies from user-facing code while maintaining full list functionality in the Chi programming language.

