Transform value while preserving key example

gistfile1.rb

require 'parslet'

class ExampleParser < Parslet::Parser
  root(:root)
  rule(:root) { width >> str("x") >> height }
  rule(:width) { match["0-9"].repeat(1).as(:width) }
  rule(:height) { match["0-9"].repeat(1).as(:height) }
end

class ExampleTransform < Parslet::Transform
  rule(:width => simple(:w)) { Integer(w) }
  rule(:height => simple(:h)) { Integer(h) }
  # rule(:width => simple(:w), :height => simple(:h)) { {width: Integer(w), height: Integer(h) } }
end

p tree = ExampleParser.new.parse('400x600')
p ExampleTransform.new.apply(tree)
#=> {:width=>400, :height=>600}