Sha256: cf7219cbc7e8fa77af06ed24b1ce6af3d4cd435ab36f88d35eafc599612b8da8

Contents?: true

Size: 1020 Bytes

Versions: 8

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Stored size: 1020 Bytes

Contents

# frozen_string_literal: true

module Liquid
  class ParseTreeVisitor
    def self.for(node, callbacks = Hash.new(proc {}))
      if defined?(node.class::ParseTreeVisitor)
        node.class::ParseTreeVisitor
      else
        self
      end.new(node, callbacks)
    end

    def initialize(node, callbacks)
      @node      = node
      @callbacks = callbacks
    end

    def add_callback_for(*classes, &block)
      callback = block
      callback = ->(node, _) { yield node } if block.arity.abs == 1
      callback = ->(_, _) { yield } if block.arity.zero?
      classes.each { |klass| @callbacks[klass] = callback }
      self
    end

    def visit(context = nil)
      children.map do |node|
        item, new_context = @callbacks[node.class].call(node, context)
        [
          item,
          ParseTreeVisitor.for(node, @callbacks).visit(new_context || context),
        ]
      end
    end

    protected

    def children
      @node.respond_to?(:nodelist) ? Array(@node.nodelist) : []
    end
  end
end

Version data entries

8 entries across 8 versions & 1 rubygems

Version Path
liquid-5.5.1 lib/liquid/parse_tree_visitor.rb
liquid-5.5.0 lib/liquid/parse_tree_visitor.rb
liquid-5.4.0 lib/liquid/parse_tree_visitor.rb
liquid-5.3.0 lib/liquid/parse_tree_visitor.rb
liquid-5.2.0 lib/liquid/parse_tree_visitor.rb
liquid-5.1.0 lib/liquid/parse_tree_visitor.rb
liquid-5.0.1 lib/liquid/parse_tree_visitor.rb
liquid-5.0.0 lib/liquid/parse_tree_visitor.rb