Class: Collie::Linter::Rules::UnusedToken

Inherits:
Base
  • Object
show all
Defined in:
lib/collie/linter/rules/unused_token.rb

Overview

Detects tokens that are declared but never used

Instance Method Summary collapse

Methods inherited from Base

#autocorrectable?, #initialize

Constructor Details

This class inherits a constructor from Collie::Linter::Base

Instance Method Details

#check(ast, context = {}) ⇒ Object 



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# File 'lib/collie/linter/rules/unused_token.rb', line 15

def check(ast, context = {})
  symbol_table = context[:symbol_table] || build_symbol_table(ast)

  # Track token usage in normal rules
  ast.rules.each do |rule|
    rule.alternatives.each do |alt|
      alt.symbols.each do |symbol|
        symbol_table.use_token(symbol.name) if symbol.terminal?
      end
    end
  end

  # Track token usage in parameterized rules (%rule)
  ast.declarations.each do |decl|
    next unless decl.is_a?(AST::ParameterizedRule)

    decl.alternatives.each do |alt|
      alt.symbols.each do |symbol|
        symbol_table.use_token(symbol.name) if symbol.terminal?
      end
    end
  end

  # Find unused tokens
  symbol_table.unused_tokens.each do |token_name|
    token_info = symbol_table.tokens[token_name]
    add_offense_for_declaration(ast, token_name, token_info[:location])
  end

  @offenses
end