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Delphi JSON to TOON encoder - 30-60% token reduction for LLM prompts

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# Toon4D Library - LLM Data Optimization

**Token-Oriented Object Notation (TOON) Encoder for Delphi**

## Overview

Toon4D is a Delphi library that encodes JSON data to TOON format - a compact, human-readable serialization format designed specifically for Large Language Model (LLM) applications. TOON achieves **30-60% token reduction** compared to standard JSON while maintaining or improving LLM comprehension.

## Key Features

- **Full TOON 2.0 Specification Compliance** - Complete implementation of all required features
- **Token Efficiency** - 30-60% token reduction on typical LLM payloads
- **Zero Dependencies** - Uses only Delphi RTL (System.JSON)
- **Cross-Platform** - Windows, macOS, Linux, iOS, Android
- **Comprehensive Test Suite** - 300+ unit tests covering all edge cases
- **Clean API** - Embarcadero-style static class methods

## TOON Format Benefits

TOON is specifically designed for LLM prompts and provides:

1. **Tabular Arrays**: Objects with uniform structure encoded as CSV-style rows
   ```toon
   users[3]{id,name,role}:
     1,Alice,admin
     2,Bob,user
     3,Charlie,viewer
   ```

2. **Minimal Syntax**: Removes redundant punctuation (braces, brackets, quotes)
3. **Explicit Structure**: Array lengths and field names declared upfront for validation
4. **Indentation-Based**: YAML-like nesting for readability

## Quick Start

### Installation

```pascal
// Add to your uses clause
uses
  Toon4D,
  Toon4D.Types;
```

### Basic Usage

```pascal
var
  JsonString := '{"name":"Alice","age":30,"active":true}';
  ToonOutput := TToon.JsonToToon(JsonString);

// Result:
// name: Alice
// age: 30
// active: true
```

### Tabular Arrays

```pascal
var
  JsonString := '''
  {
    "employees": [
      {"id": 1, "name": "Alice Johnson", "role": "admin"},
      {"id": 2, "name": "Bob Smith", "role": "user"},
      {"id": 3, "name": "Charlie Brown", "role": "user"}
    ]
  }
  ''';

ToonOutput := TToon.JsonToToon(JsonString);

// Result:
// employees[3]{id,name,role}:
//   1,Alice Johnson,admin
//   2,Bob Smith,user
//   3,Charlie Brown,user
```

### Configuration Options

```pascal
var
  Options: TToonOptions := [
    TToonOption.Indent4Spaces,      // Use 4 spaces instead of 2
    TToonOption.DelimiterPipe,      // Use pipe delimiter instead of comma
    TToonOption.KeyFoldingAggressive, // Aggressive key folding
    TToonOption.PreferTabular       // Prefer tabular format for arrays
  ];

ToonOutput := TToon.JsonToToon(JsonString, Options);
```

## Project Structure

```
Toon4D/
├── Source/
│   ├── Toon4D.pas              // Main API (TToon static class)
│   ├── Toon4D.Types.pas        // Types, enums, options, exceptions
│   ├── Toon4D.Consts.pas       // Constants and resourcestrings
│   └── Toon4D.Utils.pas        // Utility functions
├── Tests/
│   ├── Toon4D.Tests.dpr        // Test project
│   ├── Toon4D.Tests.Primitives.pas
│   ├── Toon4D.Tests.Arrays.pas
│   ├── Toon4D.Tests.ArrayEdgeCases.pas
│   ├── Toon4D.Tests.RootArrays.pas
│   ├── Toon4D.Tests.Nesting.pas
│   ├── Toon4D.Tests.KeyFolding.pas
│   ├── Toon4D.Tests.KeyEdgeCases.pas
│   ├── Toon4D.Tests.Delimiters.pas
│   ├── Toon4D.Tests.EdgeCases.pas
│   ├── Toon4D.Tests.ObjectEdgeCases.pas
│   ├── Toon4D.Tests.Whitespace.pas
│   ├── Toon4D.Tests.Integration.pas
│   ├── Toon4D.Tests.Conformance.pas
│   ├── Toon4D.Tests.OfficialFixtures.pas
│   └── Toon4D.Tests.Helpers.pas
├── SPEC.md                     // Detailed technical specification
└── README.md                   // This file
```

## Configuration Options

### TToonOption Enumeration

```pascal
type
  TToonOption = (
    // Indentation (mutually exclusive)
    Indent2Spaces,              // Default: 2 spaces per level
    Indent4Spaces,              // 4 spaces per level
    IndentCustom,               // Use CustomIndentSize

// Delimiter selection (mutually exclusive)
    DelimiterComma,             // Default: comma separator
    DelimiterTab,               // Tab separator
    DelimiterPipe,              // Pipe separator

// Key folding strategy (mutually exclusive)
    KeyFoldingNone,             // No key folding
    KeyFoldingSafe,             // Default: fold safe identifier chains
    KeyFoldingAggressive,       // Aggressive folding

// Array format preferences
    PreferTabular,              // Default: prefer tabular for uniform arrays
    PreferList,                 // Prefer list format
    ForceInlineForPrimitives,   // Force inline for primitive arrays

// Validation strictness
    StrictValidation,           // Strict TOON validation
    LenientValidation,          // Lenient validation

// Quote minimization
    MinimalQuoting,             // Default: minimal quotes
    AlwaysQuoteStrings,         // Always quote string values

// Number formatting
    NormalizeNumbers,           // Default: canonical form
    PreserveNumberFormat,       // Preserve JSON number format

// Whitespace handling
    NoTrailingWhitespace,       // Remove trailing whitespace
    CompactOutput,              // Minimize whitespace

// Error handling
    GracefulDegradation,        // Default: convert invalid to valid
    StrictConformance           // Raise exceptions on errors
  );

TToonOptions = set of TToonOption;
```

## API Reference

### TToon Class

#### JsonToToon (TJSONValue overload)

```pascal
class function JsonToToon(
  JsonValue: TJSONValue;
  Options: TToonOptions = []
): string;
```

Encodes a TJSONValue to TOON format.

**Parameters:**
- `JsonValue`: The JSON value to encode (must not be nil)
- `Options`: Encoding options (defaults to safe defaults)

**Returns:** TOON formatted string

**Raises:**
- `EToonInvalidJsonException` - When JsonValue is nil or invalid
- `EToonEncodingException` - When encoding fails in strict mode

#### JsonToToon (String overload)

```pascal
class function JsonToToon(
  const JsonString: string;
  Options: TToonOptions = []
): string;
```

Encodes a JSON string to TOON format.

**Parameters:**
- `JsonString`: Valid JSON string
- `Options`: Encoding options

**Returns:** TOON formatted string

**Raises:**
- `EToonInvalidJsonException` - When JSON string is malformed
- `EToonEncodingException` - When encoding fails in strict mode

#### Validate

```pascal
class function Validate(
  const ToonString: string;
  out ErrorMessage: string
): Boolean;
```

Validates a TOON string against the specification.

**Parameters:**
- `ToonString`: TOON formatted string to validate
- `ErrorMessage`: Output parameter with error details

**Returns:** True if valid, False otherwise

#### GetLibraryVersion

```pascal
class function GetLibraryVersion: string;
```

Returns the library version string (e.g., "1.0.0").

## References

### Official TOON Resources

1. **TOON Specification v2.0**
   https://github.com/toon-format/spec

2. **TOON Format Repository**
   https://github.com/toon-format/toon

3. **Official Test Fixtures** (340+ tests)
   https://github.com/toon-format/spec/tree/main/tests/fixtures

### Delphi Resources

4. **System.JSON Documentation**
   https://docwiki.embarcadero.com/Libraries/en/System.JSON

5. **DUnitX Testing Framework**
   https://github.com/VSoftTechnologies/DUnitX

## License

MIT License - See LICENSE file for details

## Contributing

Contributions welcome! Please open an issue or pull request on GitHub.

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