Class: YARD::Handlers::Ruby::Legacy::ClassConditionHandler

Inherits:
Base
  • Object
show all
Defined in:
lib/yard/handlers/ruby/legacy/class_condition_handler.rb

Overview

Matches if/unless conditions inside classes and attempts to process only one branch (by evaluating the condition if possible).

Examples:

A simple class conditional

class Foo
  if 0
    # This method is ignored
    def xyz; end
  end
end

Since:

  • 0.5.4

Constant Summary

Constants included from Parser::Ruby::Legacy::RubyToken

Parser::Ruby::Legacy::RubyToken::EXPR_ARG, Parser::Ruby::Legacy::RubyToken::EXPR_BEG, Parser::Ruby::Legacy::RubyToken::EXPR_CLASS, Parser::Ruby::Legacy::RubyToken::EXPR_DOT, Parser::Ruby::Legacy::RubyToken::EXPR_END, Parser::Ruby::Legacy::RubyToken::EXPR_FNAME, Parser::Ruby::Legacy::RubyToken::EXPR_MID, Parser::Ruby::Legacy::RubyToken::NEWLINE_TOKEN, Parser::Ruby::Legacy::RubyToken::TkReading2Token, Parser::Ruby::Legacy::RubyToken::TkSymbol2Token

Constants included from CodeObjects

CodeObjects::BUILTIN_ALL, CodeObjects::BUILTIN_CLASSES, CodeObjects::BUILTIN_EXCEPTIONS, CodeObjects::BUILTIN_EXCEPTIONS_HASH, CodeObjects::BUILTIN_MODULES, CodeObjects::CONSTANTMATCH, CodeObjects::CSEP, CodeObjects::CSEPQ, CodeObjects::ISEP, CodeObjects::ISEPQ, CodeObjects::METHODMATCH, CodeObjects::METHODNAMEMATCH, CodeObjects::NAMESPACEMATCH, CodeObjects::NSEP, CodeObjects::NSEPQ

Instance Method Summary collapse

Constructor Details

This class inherits a constructor from YARD::Handlers::Base

Instance Method Details

#parse_condition ⇒ true, ... (protected)

Parses the condition part of the if/unless statement

Returns:

  • (true, false, nil) —

    true if the condition can be definitely parsed to true, false if not, and nil if the condition cannot be parsed with certainty (it’s dynamic)

Since:

  • 0.5.5



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# File 'lib/yard/handlers/ruby/legacy/class_condition_handler.rb', line 28

def parse_condition
  condition = nil

  # Right now we can handle very simple unary conditions like:
  #   if true
  #   if false
  #   if 0
  #   if 100 (not 0)
  #   if defined? SOME_CONSTANT
  #
  # The last case will do a lookup in the registry and then one
  # in the Ruby world (using eval).
  case statement.tokens[1..-1].to_s.strip
  when /^(\d+)$/
    condition = $1 != "0"
  when /^defined\?\s*\(?(.+?)\)?$/
    # defined? keyword used, let's see if we can look up the name
    # in the registry, then we'll try using Ruby's powers. eval() is not
    # *too* dangerous here since code is not actually executed.
    name = $1
    obj = YARD::Registry.resolve(namespace, name, true)
    begin
      condition = true if obj || Object.instance_eval("defined? #{name}")
    rescue SyntaxError, NameError
      condition = false
    end
  when "true"
    condition = true
  when "false"
    condition = false
  end

  if TkUNLESS === statement.tokens.first
    condition = !condition if condition != nil
  end
  condition
end

#parse_else_block ⇒ Object (protected)

Since:

  • 0.5.5



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# File 'lib/yard/handlers/ruby/legacy/class_condition_handler.rb', line 72

def parse_else_block
  return unless statement.block
  stmtlist = YARD::Parser::Ruby::Legacy::StatementList
  stmtlist.new(statement.block).each do |stmt|
    if TkELSE === stmt.tokens.first
      parser.process(stmtlist.new(stmt.block))
    end
  end
end

#parse_then_block ⇒ Object (protected)

Since:

  • 0.5.5



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# File 'lib/yard/handlers/ruby/legacy/class_condition_handler.rb', line 67

def parse_then_block
  parse_block
end

#process ⇒ void

This method returns an undefined value.

Main processing callback



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# File 'lib/yard/handlers/ruby/legacy/class_condition_handler.rb', line 7

process do
  condition = parse_condition
  if condition == nil
    # Parse both blocks if we're unsure of the condition
    parse_then_block
    parse_else_block
  elsif condition
    parse_then_block
  else
    parse_else_block
  end
end