### Home Classes Methods

### In Files

- lib/yard/handlers/ruby/class_condition_handler.rb

### Parent

YARD::Handlers::Ruby::Base

### Methods

- #parse_condition
- #parse_else_block
- #parse_then_block

### Files

- LICENSE.txt
- MIT.txt

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No matching classes.

# YARD::Handlers::Ruby::ClassConditionHandler

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

@example A simple class conditional

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

### Protected Instance Methods

parse_condition() click to toggle source

Parses the condition part of the if/unless statement

@return [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)

    # File lib/yard/handlers/ruby/class_condition_handler.rb, line 35
    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.condition.type
      when :int
        condition = statement.condition[0] != "0"
      when :defined
        # 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 = statement.condition[0].source
        obj = YARD::Registry.resolve(namespace, name, true)
        begin
          condition = true if obj || Object.instance_eval("defined? #{name}")
        rescue SyntaxError, NameError
          condition = false
        end
      when :var_ref
        var = statement.condition[0]
        if var == s(:kw, "true")
          condition = true
        elsif var == s(:kw, "false")
          condition = false
        end
      end

      # Invert an unless condition
      if statement.type == :unless || statement.type == :unless_mod
        condition = !condition if condition != nil
      end
      condition
    end

parse_else_block() click to toggle source

    # File lib/yard/handlers/ruby/class_condition_handler.rb, line 81
    def parse_else_block
      if statement.else_block
        parse_block(statement.else_block, :visibility => visibility)
      end
    end

parse_then_block() click to toggle source

    # File lib/yard/handlers/ruby/class_condition_handler.rb, line 77
    def parse_then_block
      parse_block(statement.then_block, :visibility => visibility)
    end

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