Class: Caster::Accessor

Inherits:
Object
  • Object
show all
Defined in:
lib/caster/accessor.rb

Overview

provides means to easily access nested values from hash doc[‘b’] can be accessed as ‘a.b.c’ doc can be accessed as ‘a.b’ doc can be accessed as ‘a\\b’

Instance Method Summary collapse

Instance Method Details

#access(doc_var, accessor) ⇒ Object 



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# File 'lib/caster/accessor.rb', line 30

def access doc_var, accessor
  doc_var << split(accessor).map { |field| "['#{field}']" }.join
end

#delete(doc, accessor) ⇒ Object 



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# File 'lib/caster/accessor.rb', line 24

def delete doc, accessor
  sub_fields = split(accessor)
  field_to_delete = sub_fields.pop
  eval("#{access('doc', sub_fields.join('.'))}.delete('#{field_to_delete}')")
end

#get(doc, accessor) ⇒ Object 



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# File 'lib/caster/accessor.rb', line 9

def get doc, accessor
  return doc if accessor == nil
  value = eval(access('doc', accessor))
  (value.is_a? Fixnum)? value : value.clone
end

#set(doc, accessor, value) ⇒ Object 



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# File 'lib/caster/accessor.rb', line 15

def set doc, accessor, value
  sub_doc = doc
  split(accessor).each do |sub_field|
    sub_doc[sub_field] = {} if sub_doc[sub_field] == nil
    sub_doc = sub_doc[sub_field]
  end
  eval("#{access('doc', accessor)} = value")
end

#split(accessor) ⇒ Object 



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# File 'lib/caster/accessor.rb', line 34

def split accessor
  escape = false
  words = []
  w = 0
  (0..accessor.length - 1).each do |i|

    c = accessor[i].chr
    n = accessor[i+1].chr rescue ''

    if escape
      escape = false
      next
    end

    words[w] = '' if words[w] == nil

    if c == '\\'
      words[w] << n
      escape = true
      next
    end

    if c == '.'
      w = w + 1
      next
    end

    words[w] << c
  end
  words
end