Module: NanDoc::PathTardo

Included in:
Commands::Diff, SiteDiff
Defined in:
lib/nandoc/support/path-tardo.rb

Defined Under Namespace

Modules: Tardo

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.tardo_array_index(str) ⇒ Object

This is like a really basic xpath for data structures that are composed of arrays and hashes



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# File 'lib/nandoc/support/path-tardo.rb', line 7

def tardo_array_index str
  /\A\[(-?\d+)\]\Z/ =~ str ? $1.to_i : nil
end

Instance Method Details

#hash_to_paths(hash, prefix = nil) ⇒ Object 



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# File 'lib/nandoc/support/path-tardo.rb', line 12

def hash_to_paths hash, prefix=nil
  paths = []
  hash.each do |k,v|
    ch_prefix = [prefix, k].compact.join('/')
    if v.kind_of?(Hash)
      paths.concat hash_to_paths(v, ch_prefix)
    else
      paths.push ch_prefix
    end
  end
  paths
end

#path_tardo(hash_or_array, path_tardo, prefix = '') ⇒ Object 



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# File 'lib/nandoc/support/path-tardo.rb', line 25

def path_tardo hash_or_array, path_tardo, prefix = ''
  /\A([^\/]+)(?:\/(.+))?\Z/ =~ path_tardo or
    fail("no parse: #{path_tardo}")
  head, tail = $1, $2
  value = nil
  found = nil
  if idx = tardo_array_index(head)
    if idx > 0 && idx >= hash_or_array.size
      found = false
    elsif idx < 0 && (idx*-1) > hash_or_array.size
      found = false
    else
      found = true
      value = hash_or_array.slice(idx)
    end
  else
    if hash_or_array.key?(head)
      found = true
      value = hash_or_array[head]
    else
      found = false
    end
  end
  if ! found
    Tardo::NotFound.new(prefix, head, hash_or_array)
  elsif tail
    local_full_path =
      [ prefix.empty? ? nil : prefix, head ].compact.join('/')
    path_tardo(value, tail, local_full_path)
  else
    Tardo::Found.new(value)
  end
end