Class: Virginity::Vcard::Patching::Update

Inherits:
Patch
  • Object
show all
Defined in:
lib/virginity/vcard/patching.rb

Overview

to update field matching the query for automatically generated diffs this will usually only entail updates to params there is an alternative action that will be executed if there is no field to update

Constant Summary collapse

COLON = 
":"
SEMICOLON = 
";"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Patch

#field_from_query, normalize_vcard!, query_for_line, query_from_string

Constructor Details

#initialize(query, updates, alternative = nil) ⇒ Update

Returns a new instance of Update.



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# File 'lib/virginity/vcard/patching.rb', line 186

def initialize(query, updates, alternative = nil)
  @query = query
  @updates = updates
  @alternative = alternative
end

Instance Attribute Details

#alternative ⇒ Object

Returns the value of attribute alternative.



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# File 'lib/virginity/vcard/patching.rb', line 185

def alternative
  @alternative
end

#query ⇒ Object

Returns the value of attribute query.



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# File 'lib/virginity/vcard/patching.rb', line 185

def query
  @query
end

#updates ⇒ Object

Returns the value of attribute updates.



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# File 'lib/virginity/vcard/patching.rb', line 185

def updates
  @updates
end

Class Method Details

.diff_lines(before, after, options = {}) ⇒ Object 



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# File 'lib/virginity/vcard/patching.rb', line 192

def self.diff_lines(before, after, options = {})
  Update.new(
    options[:query] || Patch::query_from_string(before),
    line_diff(before, after),
    Add.new(after)
  )
end

Instance Method Details

#apply(vcard) ⇒ Object 



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# File 'lib/virginity/vcard/patching.rb', line 220

def apply(vcard)
  to_update = vcard.where(@query)
  if to_update.empty?
    # if the field has been deleted in the meantime on the server, the patch adds it again
    # to_update << vcard.add_field(field_from_query(@query)) if to_update.empty?
    @alternative.apply(vcard) unless @alternative.nil?
  else
    to_update.each { |field| update_field!(field) }
  end
end

#pretty_print(q) ⇒ Object 



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# File 'lib/virginity/vcard/patching.rb', line 238

def pretty_print(q)
  q.text "Replace #{query} with #{@updates.map {|k,v| "#{k}(#{v.inspect})" }.join(", ")})"
  if @alternative
    q.text " else { #{alternative} }"
  end
end

#to_s ⇒ Object 



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# File 'lib/virginity/vcard/patching.rb', line 231

def to_s
  s = "Update(#{@query.inspect}, #{@updates.map {|k,v| "#{k}(#{v.inspect})" }.join(", ")})"
  if @alternative
    s << " else { #{alternative} }"
  end
end

#update_field!(field) ⇒ Object 



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# File 'lib/virginity/vcard/patching.rb', line 202

def update_field!(field)
  @updates.each_pair do |key, value|
    case key
    when :value
      field.raw_value = value
    when :add_param
      # params_from_string returns an array of params
      field.params += Param::params_from_string(value + COLON)
    when :remove_param
      Param::params_from_string(value + COLON).each do |param_to_delete|
        field.params.delete_if { |p| p == param_to_delete }
      end
    else
      raise IllegalPatch, "#{key}, #{value}"
    end
  end
end