Class: LL::Rule

Inherits:

Object

• Object
• LL::Rule

show all

Defined in:

lib/ll/rule.rb

Overview

Instance Attribute Summary (collapse)

• - (Object) branches readonly

  Returns the value of attribute branches.

• - (Object) name readonly

  Returns the value of attribute name.

• - (Object) references readonly

  Returns the value of attribute references.

• - (Object) source_line readonly

  Returns the value of attribute source_line.

Instance Method Summary (collapse)

• - (Object) add_branch(steps, source_line, ruby_code = nil)
• - (Array<LL::Terminal>) first_set

  Returns an Array containing the terminals that make up the FIRST() set of this rule.

• - (Object) increment_references
• - (Rule) initialize(name, source_line) constructor

  A new instance of Rule.

• - (String) inspect

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# File 'lib/ll/rule.rb', line 12

def initialize(name, source_line)
  @name        = name
  @branches    = []
  @source_line = source_line
  @references  = 0
end

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# File 'lib/ll/rule.rb', line 6

def branches
  @branches
end

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# File 'lib/ll/rule.rb', line 6

def name
  @name
end

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# File 'lib/ll/rule.rb', line 6

def references
  @references
end

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# File 'lib/ll/rule.rb', line 6

def source_line
  @source_line
end

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# File 'lib/ll/rule.rb', line 22

def add_branch(steps, source_line, ruby_code = nil)
  branches << Branch.new(steps, source_line, ruby_code)
end

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# File 'lib/ll/rule.rb', line 36

def first_set
  terminals = []

  branches.each do |branch|
    terminals += branch.first_set
  end

  return terminals
end

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# File 'lib/ll/rule.rb', line 26

def increment_references
  @references += 1
end

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# File 'lib/ll/rule.rb', line 49

def inspect
  return "Rule(name: #{name.inspect}, branches: #{branches.inspect})"
end