hakorune/docs/private/roadmap/phases/phase-24-ultimate-language-design/INDEX.md

Phase 24: Ultimate Language Design - Comprehensive Proposal Suite

Generated: 2025-10-12 Context: AI collaboration brainstorming session (Claude + 4 Task Agents) User Request: "ultrathink task先生全員で　どんな構文や機能があればいいか考えてみてー"

🎯 Core Philosophy

"hakoruneは機能は最低限　糖衣構文とマクロで最強を目指していますじゃ boxでもいいよ"

Design Principles:

• ✅ Minimal core features (MIR 16-instruction frozen set)
• ✅ Everything desugars to Box operations
• ✅ Maximum ergonomics via sugar syntax
• ✅ Extensibility via macros and Boxes
• ✅ 80/20 rule: focus on high-impact features

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📊 Proposal Summary

Document	Count	Priority Items	Expected Impact
Sugar Syntax	22 proposals	6 high-priority	60-70% code reduction
Macro System	12 macros	5 immediate-use	Testing/debugging enhancement
Practical Boxes	20 boxes	5 essential	Real-world usability
Language Features	20 features	4 recommended	Ergonomics parity with modern languages

Total: 74 proposals across 4 categories

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🚀 Implementation Roadmap

Phase 1: Quick Wins (2-3 weeks)

Focus: High-impact, low-complexity features

Sugar Syntax:

• ✅ List comprehension: [x * 2 for x in items if x > 10]
• ✅ String interpolation: `Hello, ${name}!`
• ✅ Null coalescing assignment: x ??= default_value

Macros:

• ✅ @test - test case descriptions
• ✅ @assert - inline assertions

Boxes:

• ✅ ValidationBox - input validation
• ✅ LoggerBox - structured logging

Expected outcome: 40-50% code reduction in common cases

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Phase 2: Core Ergonomics (3-4 weeks)

Focus: Language comfort features

Sugar Syntax:

• ✅ Null-safe operator: person?.address?.street
• ✅ Range operator: 0..10, array[2..5]
• ✅ Arrow functions: arr.map(x => x * 2)
• ✅ Multiple return: return a, b, c → tuple

Macros:

• ✅ @benchmark - performance measurement
• ✅ @trace - execution tracing
• ✅ @guard - precondition checking

Boxes:

• ✅ HTTPClientBox - axios/requests equivalent
• ✅ YAMLBox - config file support
• ✅ CSVBox - data processing

Expected outcome: Python-level ergonomics, 60-70% code reduction

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Phase 3: Advanced Features (4-5 weeks)

Focus: Power user features

Sugar Syntax:

• ✅ Pattern matching in let: local Ok(value) = result
• ✅ Spread operator: [...arr1, ...arr2], {...obj1, ...obj2}
• ✅ Pipeline operator (already implemented, enhance): data |> transform1 |> transform2
• ✅ Partial application: add_10 = add(?, 10)

Macros:

• ✅ @defer - deferred execution
• ✅ @derive - automatic trait implementation
• ✅ @memo - memoization

Boxes:

• ✅ TemplateEngineBox - string template rendering
• ✅ CryptoBox - encryption/hashing
• ✅ CompressionBox - gzip/zstd

Expected outcome: Rust-level power with better ergonomics

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🎯 Priority Matrix

Immediate Impact (Implement first)

1. List comprehension (60% code reduction in data processing)
2. String interpolation (eliminate ugly concatenation)
3. @test macro (immediate benefit for selfhost compiler testing)
4. ValidationBox (essential for real-world apps)
5. HTTPClientBox (web development essential)

High Value (Implement soon)

1. Null-safe operator (crash prevention)
2. Range operator (ergonomics)
3. @benchmark macro (performance work)
4. LoggerBox (debugging)
5. YAMLBox (configuration)

Nice to Have (Implement later)

1. Spread operator
2. Partial application
3. Advanced macros (@derive, @memo)
4. Specialized boxes (Template, Crypto, etc.)

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📈 Expected Outcomes

Code Reduction

// Before (current Hakorune)
local results
results = new ArrayBox()
local i
i = 0
loop(i < items.length()) {
    local item
    item = items.get(i)
    if item > 10 {
        results.push(item * 2)
    }
    i = i + 1
}

// After (with list comprehension)
local results = [item * 2 for item in items if item > 10]

70% reduction: 13 lines → 1 line

Ergonomics Improvement

// Before (manual validation)
if name == null {
    return Err("Name required")
}
if name.length() < 3 {
    return Err("Name too short")
}

// After (with ValidationBox)
@validate(name, MinLength(3), Required())

80% reduction: 6 lines → 1 line

Testing Enhancement

// Before (manual assertions)
local result
result = calculate(10, 20)
if result != 30 {
    print("Test failed: expected 30, got " + result.to_string())
    return 1
}

// After (with @test macro)
@test("calculate adds numbers correctly")
@assert(calculate(10, 20) == 30)

90% reduction: 6 lines → 2 lines

---

🔬 Design Considerations

Desugar to Box Operations

All sugar syntax must compile to existing MIR 16-instruction set:

// List comprehension desugars to:
local results = new ArrayBox()
local __iter = items.iterator()
loop(__iter.has_next()) {
    local item = __iter.next()
    if item > 10 {
        results.push(item * 2)
    }
}

No Magic, Only Convention

• Null-safe operator: desugar to explicit null checks
• String interpolation: desugar to StringBox operations
• Pattern matching: desugar to match expressions
• Everything follows "Everything is Box" principle

Backwards Compatibility

• All new syntax is purely additive
• Existing code continues to work
• No breaking changes to MIR
• Feature flags for experimental features

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📚 Related Documents

• Sugar Syntax: sugar-syntax-proposals.md - 22 syntax proposals
• Macro System: macro-system-proposals.md - 12 macro proposals
• Practical Boxes: practical-boxes-proposals.md - 20 Box proposals
• Language Features: language-features-analysis.md - 20 feature analysis

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🎊 Acknowledgments

Generated by:

• Claude Code (orchestration)
• Task Agent 1 (sugar syntax analysis)
• Task Agent 2 (macro system design)
• Task Agent 3 (practical boxes specification)
• Task Agent 4 (language features research)

User Philosophy:

"機能は最低限　糖衣構文とマクロで最強を目指していますじゃ"

This is the way. 🚀