900 Feature Text Segmenter B4d46654

---
phase: planning
title: Planning - Text Segmenter
description: Task breakdown for implementing the text segmenter.
---

# Project Planning & Task Breakdown

## Milestones
**What are the major checkpoints?**

- [x] Milestone 1: Core segmentation logic implemented.
- [x] Milestone 2: 100% test coverage and validation.

## Task Breakdown
**What specific work needs to be done?**

### Phase 1: Implementation
- [x] Task 1.1: Define the `Chunk` dataclass.
- [x] Task 1.2: Implement `normalize_whitespace` helper.
- [x] Task 1.3: Implement `segment_text` with sliding window logic.
- [x] Task 1.4: Integrate default values from `core.utils`.

### Phase 2: Testing
- [x] Task 2.1: Write unit tests (tests/core/test_segmenter.py).
    - [ ] Test with empty string.
    - [ ] Test with string shorter than chunk size.
    - [ ] Test exact chunk size.
    - [ ] Test overlap continuity.
    - [ ] Test whitespace normalization.

## Dependencies
**What needs to happen in what order?**

- Depends on `pdf_to_epub/core/utils.py` (Completed).

## Timeline & Estimates
**When will things be done?**

- Task 1.1-1.4: 1 hour
- Task 2.1: 1.5 hours

## Risks & Mitigation
**What could go wrong?**

- **Risk:** Off-by-one errors in index calculation.
- **Mitigation:** Extensive testing with boundary sizes (e.g., chunk size 10, overlap 2).