Class: Strling::Nodes::NodeFactory

Inherits:
Object
  • Object
show all
Defined in:
lib/strling/nodes.rb

Class Method Summary collapse

Class Method Details

.from_json(hash) ⇒ Object 



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# File 'lib/strling/nodes.rb', line 21

def self.from_json(hash)
  return nil if hash.nil?

  case hash['type']
  when 'Literal'
    Literal.new(value: hash['value'])
  when 'Quantifier'
    Quantifier.new(
      target: from_json(hash['target']),
      min: hash['min'],
      max: hash['max'],
      greedy: hash['greedy'],
      lazy: hash['lazy'],
      possessive: hash['possessive']
    )
  when 'CharacterClass'
    CharacterClass.new(
      negated: hash['negated'],
      members: hash['members'].map { |m| from_json(m) }
    )
  when 'Group'
    # Note: 'expression' field in JSON seems redundant or specific, using 'body'
    Group.new(
      capturing: hash['capturing'],
      body: from_json(hash['body'] || hash['expression']),
      name: hash['name'],
      atomic: hash['atomic']
    )
  when 'Alternation'
    Alternation.new(
      alternatives: hash['alternatives'].map { |a| from_json(a) }
    )
  when 'UnicodeProperty'
    UnicodeProperty.new(
      name: hash['name'],
      value: hash['value'],
      negated: hash['negated']
    )
  when 'Sequence'
    Sequence.new(
      parts: hash['parts'].map { |p| from_json(p) }
    )
  when 'Lookahead'
    Lookahead.new(
      body: from_json(hash['body']),
      negative: hash['negative'] || false
    )
  when 'NegativeLookahead'
    Lookahead.new(
      body: from_json(hash['body']),
      negative: true
    )
  when 'Lookbehind'
    Lookbehind.new(
      body: from_json(hash['body']),
      negative: hash['negative'] || false
    )
  when 'NegativeLookbehind'
    Lookbehind.new(
      body: from_json(hash['body']),
      negative: true
    )
  when 'Anchor'
    Anchor.new(at: hash['at'])
  when 'Escape'
    Escape.new(kind: hash['kind'])
  when 'BackReference', 'Backreference'
      BackReference.new(name: hash['name'], index: hash['index'])
  when 'Dot'
      Dot.new(value: nil)
  when 'Range'
      Range.new(from: hash['from'], to: hash['to'])
  else
    # Generic fallback for unknown nodes to avoid crashing immediately, 
    # allowing us to see what's missing
    # puts "Warning: Unknown node type #{hash['type']}"
    Data.define(:type, :raw).new(type: hash['type'], raw: hash)
  end
end