Minotaur for Context-Aware Refactoring: Evaluation

Context Management Capabilities

1. Grammar-Level Context Control

Minotaur provides superior context management compared to traditional AST-based approaches:

Context Modifiers:

// Function-level context
<function-declaration (function-scope)> ::= "function" <identifier> "(" <parameters> ")" "{" <statements> "}"

// Class-level context  
<method-declaration (class-scope)> ::= <access-modifier> <identifier> "(" <parameters> ")" "{" <statements> "}"

// Block-level context
<block-statement (block-scope)> ::= "{" <statements> "}"

Dynamic Context Switching:

// Enable/disable contexts during parsing
Context(function-scope, on)   // Enter function context
Context(class-scope, off)     // Exit class context

2. Multi-Path Context Preservation

Unlike refakts’ single-path approach, Minotaur maintains multiple parsing contexts simultaneously:

Parallel Context Tracking: Multiple interpretations of ambiguous code
Context Merging: Combining contexts when ambiguities resolve
Context Invalidation: Removing invalid context paths
Context History: Maintaining parsing history for rollback operations

3. Hierarchical Context Management

Minotaur supports nested contexts that refakts cannot easily handle:

// Nested context example
<class-declaration> ::= "class" <identifier> "{" <class-members> "}" => {
  enterContext("class", $2)
  processMembers($4)
  exitContext("class")
}

<method-declaration> ::= <access> <identifier> "(" <params> ")" "{" <body> "}" => {
  enterContext("method", $2, getCurrentContext())
  processMethodBody($7)
  exitContext("method")
}

Refactoring Operation Precision

1. Grammar-Guided Surgical Operations

Minotaur enables more precise refactoring than refakts through grammar awareness:

Variable Extraction with Grammar Context:

<extract-candidate> ::= <complex-expression> => {
  if (isExtractionWorthy($1) && inValidContext()) {
    suggestExtraction($1, getCurrentScope())
  }
}

// Context-aware extraction rules
<assignment-expression (function-scope)> ::= <identifier> "=" <expression> => {
  if (shouldExtract($3)) {
    extractToLocalVariable($3, getCurrentFunction())
  }
}

<assignment-expression (class-scope)> ::= <identifier> "=" <expression> => {
  if (shouldExtract($3)) {
    extractToClassField($3, getCurrentClass())
  }
}

Scope-Aware Renaming:

<identifier-reference> ::= <identifier> => {
  recordReference($1, getCurrentScope(), getCurrentPosition())
}

// Rename operation with scope awareness
function renameInScope(identifier: string, newName: string, scope: string) {
  // Only rename references within the specified scope
  // Grammar context ensures we don't rename across scope boundaries
}

2. Language-Specific Refactoring Rules

Minotaur can define refactoring rules specific to language constructs:

// TypeScript-specific refactoring
<interface-declaration> ::= "interface" <identifier> "{" <interface-members> "}" => {
  enableRefactoring("extract-interface", $2, $4)
  enableRefactoring("implement-interface", $2)
}

// SQL-specific refactoring  
<select-statement> ::= "SELECT" <columns> "FROM" <table> <where-clause>? => {
  enableRefactoring("extract-subquery", $2, $4, $5)
  enableRefactoring("optimize-query", $0)
}

// Domain-specific language refactoring
<business-rule> ::= "WHEN" <condition> "THEN" <action> => {
  enableRefactoring("extract-rule", $2, $4)
  enableRefactoring("combine-rules", $0)
}

3. Multi-Language Refactoring Support

Minotaur’s grammar switching enables refactoring across language boundaries:

// HTML with embedded CSS and JavaScript
<style-block> ::= "<style>" <css-rules> "</style>" => {
  switchGrammar("CSS")
  enableRefactoring("extract-css-class", $2)
  enableRefactoring("optimize-css", $2)
  switchGrammar("HTML")
}

<script-block> ::= "<script>" <javascript-code> "</script>" => {
  switchGrammar("JavaScript")
  enableRefactoring("extract-function", $2)
  enableRefactoring("minify-code", $2)
  switchGrammar("HTML")
}

Advantages Over RefakTS Approach

1. Language Agnostic Operations

2. Context Granularity

| Context Level | RefakTS | Minotaur | |—————|———|————–| | Function Scope | ✓ | ✓ | | Class Scope | ✓ | ✓ | | Block Scope | ✓ | ✓ | | Custom Scopes | Limited | Full support | | Nested Contexts | Basic | Advanced | | Context History | No | Yes |

3. Refactoring Precision

| Operation Type | RefakTS | Minotaur | |—————-|———|————–| | Variable Operations | ✓ | ✓ | | Function Operations | ✓ | ✓ | | Language-Specific | Limited | Full support | | Cross-Language | No | Yes | | Custom Operations | No | Yes | | Grammar-Guided | No | Yes |

Implementation Strategy for Context-Aware Refactoring

1. Context Stack Management

interface ContextStack {
  push(context: string, identifier?: string): void;
  pop(): string | undefined;
  current(): string | undefined;
  contains(context: string): boolean;
  depth(): number;
}

// Grammar rules with context stack operations
<function-start> ::= "function" <identifier> "(" <parameters> ")" "{" => {
  contextStack.push("function", $2)
}

<function-end> ::= "}" => {
  if (contextStack.current() === "function") {
    contextStack.pop()
  }
}

2. Scope-Aware Symbol Table

interface ScopeAwareSymbolTable {
  declare(symbol: string, type: string, scope: string): void;
  lookup(symbol: string, scope: string): SymbolInfo | undefined;
  getAllInScope(scope: string): SymbolInfo[];
  findReferences(symbol: string): Reference[];
}

// Grammar integration
<variable-declaration> ::= <type> <identifier> "=" <expression> => {
  symbolTable.declare($2, $1, contextStack.current())
}

<identifier-usage> ::= <identifier> => {
  symbolTable.addReference($1, contextStack.current(), getCurrentPosition())
}

3. Refactoring Operation Framework

interface RefactoringOperation {
  name: string;
  applicableContexts: string[];
  preconditions: (context: ParseContext) => boolean;
  execute: (target: ASTNode, context: ParseContext) => RefactoringResult;
}

// Grammar-triggered refactoring
<refactoring-trigger> ::= <pattern> => {
  const operations = getApplicableRefactorings(getCurrentContext())
  operations.forEach(op => {
    if (op.preconditions(getCurrentContext())) {
      suggestRefactoring(op, $1)
    }
  })
}

Benefits for AI Code Generation

1. Reduced Context Window Usage

Focused Parsing: Only process relevant grammar rules for current context
Incremental Updates: Update only affected parts of the parse tree
Context Caching: Reuse parsing results for unchanged contexts

2. Improved Accuracy

Grammar Constraints: Ensure generated code follows language rules
Context Validation: Verify operations are valid in current scope
Multi-Language Consistency: Maintain consistency across language boundaries

3. Enhanced Capabilities

Custom Language Support: Define refactoring for domain-specific languages
Language Evolution: Adapt to language changes through grammar updates
Cross-Language Operations: Refactor across multiple languages in single file

Conclusion

Minotaur provides superior context-aware refactoring capabilities compared to refakts by:

Grammar-Level Context Control: More precise and flexible than AST-based approaches
Multi-Language Support: Native handling of embedded and mixed languages
Extensible Operations: Custom refactoring rules for any language
Hierarchical Context Management: Better handling of nested scopes and contexts
Real-Time Feedback: Immediate validation and suggestions during editing

The grammar-based approach enables AI systems to perform surgical refactoring operations with better precision and broader language support than traditional AST manipulation tools.