Class: Babeltrace2::BTFieldPath

Inherits:
BTSharedObject show all
Defined in:
lib/babeltrace2/trace-ir/field-path.rb

Defined Under Namespace

Classes: Item

Constant Summary collapse

Scope = 
BTFieldPathScope

Instance Attribute Summary

Attributes inherited from BTObject

#handle

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from BTSharedObject

inherited

Methods inherited from BTObject

#==, #to_ptr

Constructor Details

#initialize(handle, retain: true, auto_release: true) ⇒ BTFieldPath

Returns a new instance of BTFieldPath.



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# File 'lib/babeltrace2/trace-ir/field-path.rb', line 40

def initialize(handle, retain: true, auto_release: true)
  super(handle, retain: retain, auto_release: auto_release)
end

Class Method Details

.path_from_s_to_h(str) ⇒ Object 



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# File 'lib/babeltrace2/trace-ir/field-path.rb', line 89

def self.path_from_s_to_h(str)
  str_orig = str
  m = str.match(/\A(PACKET_CONTEXT|EVENT_COMMON_CONTEXT|EVENT_SPECIFIC_CONTEXT|EVENT_PAYLOAD)/)
  raise "invalid path #{str}" if !m
  path = [(m[1].downcase << "_field_class").to_sym]
  str = str.sub(m[1], "")
  while !str.empty?
    case str
    when /\A\[(\d+)\]/
      path.push :members, $1.to_i, :field_class
      str = str.sub("[#{$1}]", "")
    when /\A->/
      path.push :element_field_class
      str = str.sub("->", "")
    when /\A=>/
      path.push :field_class
      str = str.sub("=>", "")
    else
      raise "invalid path #{str_orig}"
    end
  end
  path
end

Instance Method Details

#each ⇒ Object 



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# File 'lib/babeltrace2/trace-ir/field-path.rb', line 63

def each
  if block_given?
    get_item_count.times { |i|
      yield get_item_by_index(i)
    }
  else
    to_enum(:each)
  end
end

#get_item_by_index(index) ⇒ Object Also known as: [] 



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# File 'lib/babeltrace2/trace-ir/field-path.rb', line 55

def get_item_by_index(index)
  index  = get_item_count + index if index < 0
  return nil if index >= get_item_count || index < 0
  BTFieldPathItem.new(
    Babeltrace2.bt_field_path_borrow_item_by_index_const(@handle, index))
end

#get_item_count ⇒ Object Also known as: item_count, size 



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# File 'lib/babeltrace2/trace-ir/field-path.rb', line 49

def get_item_count
  @item_count ||= Babeltrace2.bt_field_path_get_item_count(@handle)
end

#get_root_scope ⇒ Object Also known as: root_scope 



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# File 'lib/babeltrace2/trace-ir/field-path.rb', line 44

def get_root_scope
  Babeltrace2.bt_field_path_get_root_scope(@handle)
end

#to_s ⇒ Object 



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# File 'lib/babeltrace2/trace-ir/field-path.rb', line 73

def to_s
  path = ""
  path << root_scope.to_s.sub("BT_FIELD_PATH_SCOPE_","")
  each { |e|
    case e.type
    when :BT_FIELD_PATH_ITEM_TYPE_INDEX
      path << "[#{e.index}]"
    when :BT_FIELD_PATH_ITEM_TYPE_CURRENT_ARRAY_ELEMENT
      path << "->"
    when :BT_FIELD_PATH_ITEM_TYPE_CURRENT_OPTION_CONTENT
      path << "=>"
    end
  }
  path
end