Class: Hokusai::Mounting::LoopEntry

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
ui/src/hokusai/mounting/loop_entry.rb

Constant Summary collapse

INDEX_KEY = 
"index".freeze

Instance Method Summary collapse

Constructor Details

#initialize(mount_entry) ⇒ LoopEntry

Returns a new instance of LoopEntry.



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# File 'ui/src/hokusai/mounting/loop_entry.rb', line 32

def initialize(mount_entry)
  @entry = mount_entry
end

Instance Method Details

#register ⇒ Object 



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# File 'ui/src/hokusai/mounting/loop_entry.rb', line 36

def register
  child_block_class = target.class.use(ast.type)
  values = target.public_send(ast.loop.method)

  unless values.is_a?(Enumerable)
    raise Hokusai::Error.new("Loop directive `#{ast.loop.method}` on #{target.class} must return an Enumerable")
  end

  entries_to_return = []
  secondary_entries = []

  # puts "COMPILING #{ast.type}"
  # portal = Node.new(ast)
  # node = child_block_class.compile(ast.type, portal)

  values.each_with_index do |value, index|
    ctx = LoopContext.new
    ctx.add_entry(ast.loop.var, value)
    ctx.add_entry(INDEX_KEY, index)

    if ast.has_if_condition?
      if ast.if.args.size > 0
        ctx.send_target(target, target.if)
      else
        condition = target.public_send(ast.if.method)
      end

      next if condition
    end

    portal = Node.new(ast)
    node = child_block_class.compile(ast.type, portal)
    child_block = child_block_class.new(node: node)
    child_block.node.add_styles(target.class)
    child_block.node.add_props_from_block(target, context: ctx)
    child_block.node.meta.props[ast.loop.var.to_sym] = value
    child_block.node.meta.publisher.add(target)

    UpdateEntry.new(child_block, block, target).register(context: ctx)

    child_block.class.provides.merge!(parent.class.provides)

    block.node.meta << child_block

    node.ast.children.each_with_index do |child, idx|
      entries_to_return << MountEntry.new(index, child, child_block, child_block, child_block, context: nil)
    end

    siblings = []
    portal.ast.children.each_with_index do |child, idx|
      siblings << MountEntry.new(idx, child, child_block, child_block, target, context: ctx)
    end

    secondary_entries << siblings
  end

  update_loop

  [entries_to_return, secondary_entries]
end

#update_loop ⇒ Object 



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# File 'ui/src/hokusai/mounting/loop_entry.rb', line 97

def update_loop
  block.node.meta.on_update(target) do |ublock, uparent, utarget|
    values = utarget.public_send(ast.loop.method)

    unless values.is_a?(Enumerable)
      raise Hokusai::Error.new("Loop directive `#{ast.loop.method}` on #{target.class} must return an Enumerable")
    end

    key_prop = ast.props["key"]

    raise Hokusai::Error.new("Loop children must have a :key method defined") if key_prop.nil?

    key_ctx = LoopContext.new

    new_values = []

    index_key = "index".freeze
    values.each_with_index do |value, index|
      key_ctx.add_entry(ast.loop.var, value)
      key_ctx.add_entry(index_key, index)

      if key_prop.value.args.size > 0
        key = key_ctx.send_target(utarget, key_prop.value)
      elsif key_ctx.table[key_prop.value.method]
        key = key_ctx.table[key_prop.value.method]
      else
        key = utarget.public_send(key_prop.value.method)
      end

      new_values << [key, value]
    end

    previous_values = []
    children = []
    loop_var = ast.loop.var.to_sym

    ublock.children?&.each do |child|
      if key = child.node.meta.get_prop(:key)
        raise Hokusai::Error.new("Loop children must use :key field") unless key

        previous_values << [key, child.node.meta.get_prop(loop_var)]
      end

      children << child
    end

    next if new_values == previous_values

    Diff.new(previous_values, new_values).patch do |patch|
      case patch
      when UpdatePatch
        ctx = LoopContext.new
        ctx.add_entry("index", patch.target)
        ctx.add_entry(ast.loop.var, patch.value)
        children[patch.target].node.add_styles(target.class)
        children[patch.target].node.add_props_from_block(target, context: ctx)
        children[patch.target].node.meta.set_prop(ast.loop.var.to_sym, patch.value)

        UpdateEntry.new(children[patch.target], uparent, utarget).register(context: ctx)
      when MovePatch
        if patch.delete
          from = children[patch.from]
          children[patch.to] = from
          children[patch.from].public_send(:on_destroy) if children[patch.from].respond_to? :on_destroy
          children[patch.from].node.destroy
          children[patch.from] = nil
        else
          from = children[patch.from]
          to = children[patch.to]

          children[patch.to] = from
          children[patch.from] = to
        end

        ctx = LoopContext.new
        ctx.add_entry(INDEX_KEY, patch.to)
        children[patch.to].node.meta.props.each do |k, v|
          ctx.add_entry(k.to_s, v)
        end

        children[patch.to].node.add_styles(target.class)
        children[patch.to].node.add_props_from_block(target, context: ctx)
      when InsertPatch
        target_ast = ast
        ctx = LoopContext.new
        ctx.add_entry(INDEX_KEY, patch.target)
        ctx.add_entry(ast.loop.var, patch.value)

        if ast.has_if_condition?
          if ast.if.args.size > 0
            condition = ctx.send_target(target, ast.if.method)
          else
            condition = target.public_send(ast.if.method)
          end

          if !condition && ast.has_else_condition?
            target_ast = ast.else_ast
          elsif !condition
            children[patch.target].public_send(:on_destroy) if children[patch.target].respond_to? :on_destroy
            children[patch.target].node.destroy
            children[patch.target] = nil
            next
          end
        end

        child_block_class = utarget.class.use(target_ast.type)
        portal = Node.new(ast)
        node = child_block_class.compile(target_ast.type, portal)
        node.add_props_from_block(target, context: ctx)
        child_block = NodeMounter.new(node, child_block_class).mount(context: ctx)
        child_block.node.add_styles(target.class)
        child_block.node.meta.publisher.add(target)

        child_block.class.provides.merge!(parent.class.provides)

        if patch.delete
          children[patch.target] = child_block
        else
          children.insert(patch.target, child_block)
        end
      when DeletePatch
        children[patch.target].public_send(:on_destroy) if children[patch.target].respond_to? :on_destroy
        children[patch.target].node.destroy
        children[patch.target] = nil
        # TODO: update rest of block props
      end
    end

    ublock.node.meta.children = children.reject(&:nil?)
  end
end