Module: Ruote::RadialReader

Defined in:
lib/ruote/reader/radial.rb

Overview

Turning radial strings into ruote trees.

Defined Under Namespace

Classes: Node, Parser, PreRoot, Transformer

Class Method Summary collapse

Class Method Details

.read(s, opt = nil) ⇒ Object

The entry point : takes a radial string and returns, if possible, a ruote tree.



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# File 'lib/ruote/reader/radial.rb', line 251

def self.read(s, opt=nil)

  parser = Parser.new
  transformer = Transformer.new

  lines = parser.parse("\n#{s}\n")
  nodes = transformer.apply(lines)

  root = PreRoot.new("#{s.strip.split("\n").first}...")
  current = root

  nodes = [] unless nodes.is_a?(Array)
    # force ArgumentError via empty PreRoot

  nodes.each do |node|

    parent = current

    if node.indentation == current.indentation
      parent = current.parent
    elsif node.indentation < current.indentation
      while node.indentation <= parent.indentation
        parent = parent.parent
      end
    end

    node.parent = parent
    current = node
  end

  root.to_a

rescue Parslet::ParseFailed => e
  class << e; attr_accessor :error_tree; end
  e.error_tree = parser.root.error_tree
  raise e
end

.understands?(s) ⇒ Boolean

Returns tree if s seems to contain a radial process definition

Returns:

  • (Boolean) 


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# File 'lib/ruote/reader/radial.rb', line 241

def self.understands?(s)

  return false if s.match(/\n *end\b/)
  return false if s.match(/\bRuote\.(process_definition|workflow_definition|define)\b/)
  true
end