Module: Ruby2JS::Filter::LitElement

Extended by:
SEXP
Includes:
SEXP
Defined in:
lib/ruby2js/filter/lit-element.rb

Constant Summary collapse

LITELEMENT_IMPORT = 
s(:import,
[s(:pair, s(:sym, :from), s(:str, "lit-element"))],
[s(:const, nil, :LitElement), s(:attr, nil, :css), s(:attr, nil, :html)])

Instance Method Summary collapse

Methods included from SEXP

S, s

Instance Method Details

#html_wrap(node) ⇒ Object 



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# File 'lib/ruby2js/filter/lit-element.rb', line 139

def html_wrap(node)
  if node.type == :str and node.children.first.strip.start_with? '<'
    s(:taglit, s(:sym, :html), s(:dstr, node))
  elsif node.type == :dstr
    prefix = ''
    node.children.each do |child|
      break unless child.type == :str
      prefix += child.children.first
    end

    return node unless prefix.strip.start_with? '<'

    children = node.children.map do |child|
      if child.type == :str
        child
      else
        html_wrap(child)
      end
    end

    while children.length > 1 and children.last.type == :str and
      children.last.children.last.strip == ''
      children.pop
    end

    if children.last.type == :str
      children << s(:str, children.pop.children.first.chomp)
    end

    s(:taglit, s(:sym, :html), node.updated(nil, children))
  elsif node.type == :begin
    node.updated(nil, node.children.map {|child| html_wrap(child)})
  elsif node.type == :if
    node.updated(nil, [node.children.first,
      *node.children[1..2].map {|child| html_wrap(child)}])
  elsif node.type == :block and
    node.children.first.children[1] == :map
    node.updated(nil, [*node.children[0..1],
      html_wrap(node.children[2])])
  else
    node
  end
end

#initialize(node) ⇒ Object 



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# File 'lib/ruby2js/filter/lit-element.rb', line 13

def initialize(node)
  super
  @le_props = nil
end

#le_walk(node) ⇒ Object

analyze ivar usage



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# File 'lib/ruby2js/filter/lit-element.rb', line 184

def le_walk(node)
  node.children.each do |child|
    next unless child.is_a? Parser::AST::Node

    if child.type == :ivar
      @le_props[child.children.first] ||= nil
    elsif child.type == :ivasgn || child.type == :op_asgn
      prop = child.children.first
      unless prop.is_a? Symbol
        prop = prop.children.first if prop.type == :ivasgn
        next unless prop.is_a? Symbol
      end

      @le_props[prop] = case child.children.last.type
        when :str, :dstr
          :String
        when :array
          :Array
        when :int, :float
          :Number
        when :true, :false
          :Boolean
        else
          @le_props[prop] || :Object
      end
    else
      le_walk(child)
    end
  end
end

#on_class(node) ⇒ Object 



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# File 'lib/ruby2js/filter/lit-element.rb', line 38

def on_class(node)
  cname, inheritance, *body = node.children
  return super unless inheritance == s(:const, nil, :LitElement)

  @le_props = {}
  le_walk(node)

  prepend_list << LITELEMENT_IMPORT if modules_enabled?

  nodes = body.dup
  if nodes.length == 1 and nodes.first&.type == :begin
    nodes = nodes.first.children.dup
  end

  # insert/update static get properties() {}
  unless @le_props.empty?
    values = nodes.find_index {|child| 
      child.type == :defs and child.children[0..1] == [s(:self), :properties]
    }

    if values == nil
      nodes.unshift s(:defp, s(:self), :properties, s(:args), s(:return, 
        s(:hash, *@le_props.map {|name, type| s(:pair, s(:str, name.to_s[1..-1]), 
        s(:hash, s(:pair, s(:sym, :type), s(:const, nil, type || :String))))})))
    elsif nodes[values].children[3].type == :hash
      le_props = @le_props.map {|name, type| 
        [s(:sym, name.to_s[1..-1].to_sym), 
        s(:hash, s(:pair, s(:sym, :type), s(:const, nil, type || :String)))]
      }.to_h.merge(
        nodes[values].children[3].children.map {|pair| pair.children}.to_h
      )

      nodes[values] = nodes[values].updated(nil,
        [*nodes[values].children[0..2], s(:hash,
        *le_props.map{|name, value| s(:pair, name, value)})])
    end
  end

  # render of a string is converted to a taglit :html
  render = nodes.find_index {|child| 
    child&.type == :def and child.children.first == :render
  }
  if render and %i[str dstr].include?(nodes[render].children[2]&.type)
    nodes[render] = nodes[render].updated(:deff,
      [*nodes[render].children[0..1],
      s(:autoreturn, html_wrap(nodes[render].children[2]))])
  end

  # self.styles returning string is converted to a taglit :css
  styles = nodes.find_index {|child| 
    child&.type == :defs and child.children[0..1] == [s(:self), :styles]
  }
  if styles and %i[str dstr].include?(nodes[styles].children[3]&.type)
    string = nodes[styles].children[3]
    string = s(:dstr, string) if string.type == :str
    children = string.children.dup

    while children.length > 1 and children.last.type == :str and
      children.last.children.last.strip == ''
      children.pop
    end

    if children.last.type == :str
      children << s(:str, children.pop.children.first.chomp)
    end

    nodes[styles] = nodes[styles].updated(nil,
      [*nodes[styles].children[0..2],
      s(:autoreturn, s(:taglit, s(:sym, :css),
      s(:dstr, *children)))])
  end

  # insert super calls into initializer
  initialize = nodes.find_index {|child| 
    child&.type == :def and child.children.first == :initialize
  }
  if initialize and nodes[initialize].children.length == 3
    statements = nodes[initialize].children[2..-1]

    if statements.length == 1 and statements.first.type == :begin
      statements = statements.first.children 
    end

    unless statements.any? {|statement| %i[super zuper].include?  statement.type}
      nodes[initialize] = nodes[initialize].updated(nil,
      [*nodes[initialize].children[0..1],
      s(:begin, s(:zsuper), *statements)])
    end
  end

  props = @le_props.keys.map {|prop| [prop.to_sym, s(:self)]}.to_h

  nodes.unshift s(:defineProps, props)

  nodes.pop unless nodes.last

  node.updated(nil, [*node.children[0..1], s(:begin, *process_all(nodes))])
ensure
  @le_props = nil
end

#on_ivar(node) ⇒ Object 



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# File 'lib/ruby2js/filter/lit-element.rb', line 18

def on_ivar(node)
  return super unless @le_props&.include?(node.children.first)
  s(:attr, s(:self), node.children.first.to_s[1..-1])
end

#on_ivasgn(node) ⇒ Object 



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# File 'lib/ruby2js/filter/lit-element.rb', line 23

def on_ivasgn(node)
  return super unless @le_props&.include?(node.children.first)
  return super unless node.children.length > 1
  s(:send, s(:self), node.children.first.to_s[1..-1]+'=',
    process(node.children[1]))
end

#on_op_asgn(node) ⇒ Object 



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# File 'lib/ruby2js/filter/lit-element.rb', line 30

def on_op_asgn(node)
  return super unless node.children.first.type == :ivasgn
  var = node.children.first.children.first
  return super unless @le_props&.include?(var)
  super node.updated(nil, [s(:attr, s(:attr, nil, :this),
    var.to_s[1..-1]), *node.children[1..-1]])
end