Class: CompEx::Template::Assembler

Inherits:
Object
  • Object
show all
Defined in:
lib/compex/template/assembler.rb

Constant Summary collapse

HTML_VOID_TAG = 
%w[area base br col embed hr img input link meta param source track wbr].freeze
ELEMENTS_WITH_SELF_CLOSING_CHILDREN = 
%w[svg math].freeze
COMPONENT_NAME_PATTERN = 
/^(::)?[A-Z]\w*+(::[A-Z]\w*)*$/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ast, context_id) ⇒ Assembler

Returns a new instance of Assembler.



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# File 'lib/compex/template/assembler.rb', line 11

def initialize(ast, context_id)
  @ast = ast
  @embeddings = {}
  @components = {}
  @result = []
  @literal = +""
  @context_id = context_id
  @embedding_id = 0
  @component_id = 0
end

Instance Attribute Details

#components ⇒ Object

Returns the value of attribute components.



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# File 'lib/compex/template/assembler.rb', line 9

def components
  @components
end

#context_id ⇒ Object

Returns the value of attribute context_id.



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# File 'lib/compex/template/assembler.rb', line 9

def context_id
  @context_id
end

#embeddings ⇒ Object

Returns the value of attribute embeddings.



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# File 'lib/compex/template/assembler.rb', line 9

def embeddings
  @embeddings
end

#result ⇒ Object

Returns the value of attribute result.



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# File 'lib/compex/template/assembler.rb', line 9

def result
  @result
end

Instance Method Details

#assemble ⇒ Object 



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# File 'lib/compex/template/assembler.rb', line 22

def assemble
  @ast.each { assemble_one(it) }
  push_literal
  @result
end

#assemble_attr(at) ⇒ Object 



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# File 'lib/compex/template/assembler.rb', line 90

def assemble_attr(at)
  @literal << at.name
  if at.value.nil?
    @literal << " "
    return
  end
  @literal << "="
  case at.value
  when MiniHTML::AST::String
    @literal << at.value.quote
    @literal << at.value.literal
    @literal << at.value.quote

  when MiniHTML::AST::Executable
    push_literal
    id = "__cx_embedding_quoted_#{@context_id}_#{@embedding_id}__"
    @embedding_id += 1
    @embeddings[id] = at.value.source
    @result << { kind: :executable, id: id, source: at.value.source }

  when MiniHTML::AST::Interpolation
    assemble_interpolation(at.value)

  when MiniHTML::AST::Literal
    @literal << at.value.value

  else
    raise "Unexpected attr value node type #{at.value.class}"
  end
end

#assemble_children_self_closing(node) ⇒ Object 



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# File 'lib/compex/template/assembler.rb', line 121

def assemble_children_self_closing(node)
  old_self_closing = @allow_self_closing
  @allow_self_closing = true
  node.children.each { assemble_one(it) }
ensure
  @allow_self_closing = old_self_closing
end

#assemble_interpolation(int) ⇒ Object 



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# File 'lib/compex/template/assembler.rb', line 129

def assemble_interpolation(int)
  @literal << int.values.first.quote
  @literal << int.values.first.literal

  int.values[1...].each do |v|
    case v
    when MiniHTML::AST::String
      @literal << v.literal
    when MiniHTML::AST::Executable
      push_literal
      id = "__cx_embedding_#{@context_id}_#{@embedding_id}__"
      @embedding_id += 1
      @embeddings[id] = v.source
      @result << { kind: :executable, id: id, source: v.source }
    end
  end

  @literal << int.values.first.quote
end

#assemble_one(node) ⇒ Object 



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# File 'lib/compex/template/assembler.rb', line 46

def assemble_one(node)
  case node
  when MiniHTML::AST::PlainText
    @literal << node.literal
  when MiniHTML::AST::Tag
    name = component?(node) ? make_component(node) : node.name
    @literal << "<#{name}"
    has_attrs = !node.attributes.empty?
    if has_attrs
      @literal << " "
      process_custom_events(node)
      node.attributes.each { assemble_attr(it) }
    end

    if node.self_closing? && (@allow_self_closing || HTML_VOID_TAG.include?(name))
      @literal << " " if has_attrs
      @literal << "/>"
      return
    elsif node.self_closing?
      @literal << "></#{name}>"
      return
    end

    @literal << ">"

    if ELEMENTS_WITH_SELF_CLOSING_CHILDREN.include?(name)
      assemble_children_self_closing(node)
    else
      node.children.each { assemble_one(it) }
    end

    @literal << "</#{name}>"

  when MiniHTML::AST::Executable
    push_literal
    id = "__cx_embedding_#{@context_id}_#{@embedding_id}__"
    @embedding_id += 1
    @embeddings[id] = node.source
    @result << { kind: :executable, id:, source: node.source }
  else
    raise "Unexpected node type #{node.class}"
  end
end

#component?(node) ⇒ Boolean

Returns:



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# File 'lib/compex/template/assembler.rb', line 37

def component?(node) = COMPONENT_NAME_PATTERN.match?(node.name)

#make_component(node) ⇒ Object 



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# File 'lib/compex/template/assembler.rb', line 39

def make_component(node)
  name = "compex-component-#{@component_id}"
  @component_id += 1
  @components[name] = node.name
  name
end

#process_custom_events(node) ⇒ Object 



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# File 'lib/compex/template/assembler.rb', line 149

def process_custom_events(node)
  events = []
  to_remove = []
  node.attributes.each do |at|
    next unless at.name.start_with?("cx-on:")

    name = at.name.split(":", 2).last
    next unless name

    handler = at.value.literal
    to_remove << at.name
    if handler.include? ","
      warn "[CompEx] Ignoring custom event definition containing commas: #{at.name}=#{at.value.inspect}"
      next
    end
    events << { name:, handler: }
  end

  node.attributes.reject! { to_remove.include? it.name }
  return if events.empty?

  @literal << "cx-custom-handlers="
  @literal << events.map { "#{it[:name]}->#{it[:handler]}" }.join(",").inspect
  @literal << " "
end

#push_literal ⇒ Object 



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# File 'lib/compex/template/assembler.rb', line 28

def push_literal
  return if @literal.empty?

  @result << { kind: :literal, value: @literal }
  @literal = +""
end