Class: Mayu::Resources::Transformers::Haml::Transformer

Inherits:
SyntaxTree::Haml::Visitor
  • Object
show all
Defined in:
lib/mayu/resources/transformers/haml.rb

Defined Under Namespace

Classes: Result

Constant Summary collapse

IN_RE = 
/\A\s*in\s+/

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Transformer

Returns a new instance of Transformer.



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# File 'lib/mayu/resources/transformers/haml.rb', line 424

def initialize(options)
  @options = options
  @builder = RubyBuilder.new(options)
  @state = {}
end

Instance Method Details

#append_whitespace(children) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 683

def append_whitespace(children)
  [*children, nil].each_cons(2)
    .flat_map do |curr, succ|
      if succ in {
           type: :tag, value: { nuke_inner_whitespace: true }
         }
        if curr in { type: :plain, value: { text: } }
          curr.value = { text: "#{text} " }
        else
          next curr, make_space(curr)
        end
      end

      curr
    end
end

#fix_syntax_by_adding_missing_pairs(source) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 830

def fix_syntax_by_adding_missing_pairs(source)
  left_right = SyntaxSuggest::LeftRightLexCount.new
  SyntaxSuggest::LexAll.new(source:).each { left_right.count_lex(_1) }
  left_right.missing
  [source, *left_right.missing].join("\n")
end

#group_condition(type, chunk) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 638

def group_condition(type, chunk)
  parse_ruby(join_ruby_script_nodes(chunk), fix: true) => [statement]

  visitor = MutationVisitor.new

  chunk.shift if type == :case

  visitor.mutate("Statements") do |node|
    top = chunk.shift

    if node.child_nodes in [SyntaxTree::VoidStmt]
      @builder.Statements(visit_tag_children(top.children))
    else
      unless top.children.empty?
        raise "Line #{top.line} should not have children."
      end

      node
    end
  end

  @builder.ruby_script([statement.accept(visitor)])
end

#group_control_statements(children) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 575

def group_control_statements(children)
  children
    .chunk_while do |a, b|
      case [a, b]
      in [
           { type: :script, value: { keyword: "if" | "elsif" } },
           { type: :script, value: { keyword: "elsif" | "else" } }
         ]
        true
      in [
           { type: :script, value: { keyword: "case" | "when" } },
           { type: :script, value: { keyword: "when" | "else" } }
         ]
        true
      in [
           {
             type: :script,
             value: { keyword: "case" } | { text: IN_RE }
           },
           {
             type: :script,
             value: { keyword: "else" } | { text: IN_RE }
           }
         ]
        true
      in [
           { type: :script, value: { keyword: "begin" } },
           {
             type: :script,
             value: { keyword: "rescue" | "else" | "ensure" }
           }
         ]
        true
      in [
           { type: :script, value: { keyword: "rescue" } },
           { type: :script, value: { keyword: "else" | "ensure" } }
         ]
        true
      in [
           { type: :script, value: { keyword: "else" } },
           { type: :script, value: { keyword: "ensure" } }
         ]
        true
      else
        false
      end
    end
    .map do |chunk|
      case chunk
      in [{ type: :script, value: { keyword: "if" } }, *]
        @builder.compute(group_condition(:if, chunk))
      in [{ type: :script, value: { keyword: "case" } }, *]
        @builder.compute(group_condition(:case, chunk))
      in [{ type: :script, value: { keyword: "begin" } }, *]
        @builder.compute(group_condition(:begin, chunk))
      else
        chunk.map { _1.accept(self) }
      end
    end
    .flatten
    .compact
end

#join_plain_nodes(children) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 551

def join_plain_nodes(children)
  children
    .chunk_while do |prev, curr|
      (
        (prev in { type: :plain, value: { text: prev_text } }) &&
          (curr in { type: :plain, value: { text: new_text } })
      )
    end
    .map do |chunk|
      case chunk
      in [{ type: :plain } => first, *]
        text = chunk.map { _1.value[:text].to_s.strip }.join(" ")
        first.value[:text] = text
        first
      else
        chunk
      end
    end
    .flatten
    .compact
end

#join_ruby_script_nodes(nodes) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 662

def join_ruby_script_nodes(nodes)
  nodes.map { _1.value[:text] }.join("\n")
end

#make_space(ref_node) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 700

def make_space(ref_node)
  ::Haml::Parser::ParseNode.new(
    :plain,
    ref_node.line,
    { text: " " },
    ref_node.parent,
    []
  )
end

#parse_ruby(source, fix: false) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 805

def parse_ruby(source, fix: false)
  source = fix_syntax_by_adding_missing_pairs(source) if fix

  SyntaxTree.parse(source).statements.body
rescue SyntaxTree::Parser::ParseError => e
  explain =
    SyntaxSuggest::ExplainSyntax.new(
      code_lines: SyntaxSuggest::CodeLine.from_source(source)
    ).call

  msg = ["Failed parsing Ruby: #{source}"]

  msg.push <<~MSG unless explain.errors.empty?
      Errors:
        #{explain.errors.join("  \n")}
    MSG

  msg.push <<~MSG unless explain.missing.empty?
      Missing:
        #{explain.missing.map { explain.why(_1) }.join("  \n")}
    MSG

  raise ParseError, "\n#{msg.join("\n")}"
end

#prepend_whitespace(children) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 666

def prepend_whitespace(children)
  [nil, *children].each_cons(2)
    .map do |prev, curr|
      if prev in {
           type: :tag, value: { nuke_outer_whitespace: true }
         }
        if curr in { type: :plain, value: { text: } }
          curr.value = { text: " #{text}" }
        else
          next make_space(curr), curr
        end
      end

      curr
    end
end

#string_keys_to_labels_mutation_visitor ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 858

def string_keys_to_labels_mutation_visitor
  visitor = MutationVisitor.new

  visitor.mutate("Assoc[key: StringLiteral]") do |assoc|
    @builder.Assoc(
      @builder.Label(
        assoc.key.parts.map(&:value).join.gsub("-", "_") + ":"
      ),
      assoc.value
    )
  end

  visitor
end

#transform_script_node(node) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 786

def transform_script_node(node)
  source = node.value.fetch(:text).strip

  if node.children.empty?
    parse_ruby(source, fix: false) => statements
    return @builder.ruby_script(statements)
  end

  parse_ruby(source, fix: true) => [statement]

  visitor = MutationVisitor.new

  visitor.mutate("Statements[body: [VoidStmt]]") do
    @builder.Statements(visit_tag_children(node.children))
  end

  @builder.ruby_script([statement.accept(visitor)])
end

#visit_filter(node) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 710

def visit_filter(node)
  case node.value
  in { name: "ruby", text: }
    @builder.ruby_script(parse_ruby(text)) if text
  in { name: "css", text: }
    CSS.transform(
      source: text,
      source_path:
        @options.source_path_without_extension + ".haml (inline css)",
      source_line: node.line
    )
  in { name: "plain", text: }
    case text.inspect.each_line.to_a
    in []
      # noop
    in [line]
      @builder.string_literal(text)
    in [*lines]
      @builder.Heredoc(lines.map { @builder.TStringContent(_1) })
    end
  end
end

#visit_haml_comment(node) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 463

def visit_haml_comment(node)
  nil
end

#visit_plain(node) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 733

def visit_plain(node)
  node.value => { text: }
  @builder.string_literal(text)
end

#visit_root(node) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 430

def visit_root(node)
  setup = []
  styles = []
  render = []

  node.children.each do |child|
    case child
    in { type: :filter, value: { name: "ruby" } }
      if setup.empty? && styles.empty?
        setup.push(child)
      else
        render.push(child)
      end
    in type: :script | :silent_script
      render.push(child)
    in { type: :filter, value: { name: "css" } }
      styles.push(child.accept(self))
    in type: :tag
      render.push(child)
    end
  end

  Result.new(
    program:
      @builder.create_program(
        group_control_statements(setup),
        styles,
        group_control_statements(render)
      ),
    styles:
  )
end

#visit_script(node) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 738

def visit_script(node)
  case node.value[:text].strip
  when /\Areturn\s+(?<type>if|unless)\s+(?<condition_source>.+)/
    $~ => { type:, condition_source: }

    parse_ruby(condition_source, fix: true) => [condition]

    statements =
      @builder.Statements(
        [
          @builder.ReturnNode(
            @builder.Args(visit_tag_children(node.children))
          )
        ]
      )

    case type
    in "if"
      @builder.IfNode(condition, statements, nil)
    in "unless"
      @builder.UnlessNode(condition, statements, nil)
    end
  when /\Areturn/
    @builder.ReturnNode(
      @builder.Args(visit_tag_children(node.children))
    )
  else
    @builder.compute(transform_script_node(node))
  end
end

#visit_silent_script(node) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 776

def visit_silent_script(node)
  with_state(:is_silent, true) do |was_silent|
    if was_silent
      visit_script(node)
    else
      @builder.silent(visit_script(node))
    end
  end
end

#visit_slot_tag(node) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 467

def visit_slot_tag(node)
  node.value => { attributes:, dynamic_attributes: }

  name = nil

  if new = dynamic_attributes.new
    parse_ruby(dynamic_attributes.new) => [parsed_attributes]
    hash = parsed_attributes.accept(HashKeyExtractorVisitor.new)

    name = hash[:name] || hash["name"]
  end

  if attr = attributes["name"]
    name ||= @builder.string_literal(attr)
  end

  return(
    @builder.slot(
      name,
      fallback: node.children.map { _1.accept(self) }
    )
  )
end

#visit_tag(node) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 491

def visit_tag(node)
  node.value => {
    name:, attributes:, dynamic_attributes:, self_closing:, value:
  }

  return visit_slot_tag(node) if name == "slot"

  attrs = []

  if @options.transform_elements_to_classes
    attrs.push(@builder.props_hash(class: :"__#{name}"))
  end

  attrs.push(@builder.props_hash(attributes)) unless attributes.empty?

  if old = dynamic_attributes.old
    attrs.push(*parse_ruby(old))
  end

  if new = dynamic_attributes.new
    attrs.push(
      *parse_ruby(new)
        .map { _1.accept(string_keys_to_labels_mutation_visitor) }
        .map { _1.accept(wrap_handler_mutation_visitor) }
    )
  end

  if object_ref = node.value[:object_ref]
    unless object_ref == :nil
      parse_ruby(object_ref) => [key]
      attrs.push(@builder.props_hash(key:))
    end
  end

  @builder.tag(
    name,
    if value
      if node.value[:parse]
        parse_ruby(value, fix: false) => statements
        @builder.ruby_script(statements)
      elsif !value.empty?
        @builder.string_literal(value.to_s)
      end
    else
      visit_tag_children(node.children)
    end,
    attrs
  )
end

#visit_tag_children(children) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 541

def visit_tag_children(children)
  children
    .reject { _1 in { type: :plain, value: { text: "" } } }
    .then { join_plain_nodes(_1) }
    .then { prepend_whitespace(_1) }
    .then { append_whitespace(_1) }
    .then { group_control_statements(_1) }
    .flatten
end

#with_state(name, value, &block) ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 769

def with_state(name, value, &block)
  @state[name], prev = value, @state[name]
  yield prev
ensure
  @state[name] = prev
end

#wrap_handler_mutation_visitor ⇒ Object 



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# File 'lib/mayu/resources/transformers/haml.rb', line 837

def wrap_handler_mutation_visitor
  visitor = MutationVisitor.new

  visitor.mutate(
    "Assoc[key: Label, value: VCall[value: Ident]]"
  ) do |assoc|
    if assoc.key.value.start_with?("on")
      handler_name = @builder.SymbolLiteral(assoc.value.value)

      @builder.Assoc(
        assoc.key,
        @builder.call_helpers(:handler, [handler_name])
      )
    else
      assoc
    end
  end

  visitor
end