Class: Code::Object::Html

Inherits:
Object show all
Defined in:
lib/code/object/html.rb

Constant Summary collapse

CLASS_DOCUMENTATION = 
{
  name: "Html",
  description: "builds, escapes, parses, and queries html fragments.",
  examples: [
    "Html.p { :hello }",
    "Html.escape(\"<p>a</p>\")",
    "Html.raw(\"<p>a</p>\").css(\"p\")"
  ]
}.freeze
CLASS_FUNCTIONS = 
{
  "escape" => {
    name: "escape",
    description: "escapes a value for html text.",
    examples: [
      "Html.escape(\"<p>\")",
      "Html.escape(:hello)",
      "Html.escape(() => { \"<strong>hello</strong>\" })"
    ]
  },
  "unescape" => {
    name: "unescape",
    description: "converts html entities and tags to text.",
    examples: [
      "Html.unescape(\"&lt;p&gt;\")",
      "Html.unescape(\"<p>hello</p>\")",
      "Html.unescape(() => { \"&amp;\" })"
    ]
  },
  "join" => {
    name: "join",
    description: "joins html or text values with an optional separator.",
    examples: [
      "Html.join([:a, :b], \", \")",
      "Html.join([Html.text(\"a\"), Html.text(\"b\")])",
      "Html.join(\"<br>\", () => { [\"a\", \"b\"] })"
    ]
  },
  "text" => {
    name: "text",
    description: "builds an escaped html text fragment.",
    examples: [
      "Html.text(:hello)",
      "Html.text(\"<strong>hello</strong>\")",
      "Html.text(() => { :hello })"
    ]
  },
  "raw" => {
    name: "raw",
    description:
      "parses markup into an html fragment without escaping text.",
    examples: [
      "Html.raw(\"<strong>hello</strong>\")",
      "Html.raw(Html.text(:hello))",
      "Html.raw(() => { \"<em>hello</em>\" })"
    ]
  }
}.freeze
INSTANCE_FUNCTIONS = 
{
  "css" => {
    name: "css",
    description: "returns all html nodes matching a css selector.",
    examples: [
      "Html.raw(\"<p>a</p><p>b</p>\").css(\"p\")",
      "Html.raw(\"<main><p>a</p></main>\").css(\"main p\")",
      "Html.raw(\"<p class='x'>a</p>\").css(\".x\")"
    ]
  },
  "at_css" => {
    name: "at_css",
    description: "returns the first html node matching a css selector.",
    examples: [
      "Html.raw(\"<p>a</p><p>b</p>\").at_css(\"p\")",
      "Html.raw(\"<main><p>a</p></main>\").at_css(\"main p\")",
      "Html.raw(\"<p class='x'>a</p>\").at_css(\".x\")"
    ]
  },
  "map" => {
    name: "map",
    description:
      "returns a list by calling a function for each html node.",
    examples: [
      "Html.raw(\"<p>a</p><p>b</p>\").css(\"p\").map((node) => { node.to_string })",
      "Html.raw(\"<p>a</p>\").css(:p).map((node, index) => { index })",
      "Html.raw(\"<p>a</p>\").css(:p).map((node, index, nodes) => { nodes.to_string })"
    ]
  },
  "to_string" => {
    name: "to_string",
    description: "returns the html fragment's text content.",
    examples: [
      "Html.raw(\"<p>hello</p>\").to_string",
      "Html.text(:hello).to_string",
      "Html.raw(\"<p><strong>hello</strong></p>\").to_string"
    ]
  },
  "to_html" => {
    name: "to_html",
    description: "returns the html fragment as html markup.",
    examples: [
      "Html.raw(\"<p>hello</p>\").to_html",
      "Html.text(:p).to_html",
      "Html.raw(\"<strong>hello</strong>\").to_html"
    ]
  },
  "inner_text" => {
    name: "inner_text",
    description: "returns the html fragment's text content.",
    examples: [
      "Html.raw(\"<p>hello</p>\").inner_text",
      "Html.text(:hello).inner_text",
      "Html.raw(\"<p><strong>hello</strong></p>\").inner_text"
    ]
  },
  "attribute" => {
    name: "attribute",
    description: "returns an html node attribute by name.",
    examples: [
      "Html.raw(\"<a href='/'>home</a>\").at_css(:a).attribute(:href)",
      "Html.raw(\"<p class='x'>a</p>\").at_css(:p).attribute(:class)",
      "Html.raw(\"<img alt='logo'>\").at_css(:img).attribute(:alt)"
    ]
  },
  "attributes" => {
    name: "attributes",
    description: "returns an html node's attributes as a dictionary.",
    examples: [
      "Html.raw(\"<a href='/'>home</a>\").at_css(:a).attributes",
      "Html.raw(\"<p class='x'>a</p>\").at_css(:p).attributes",
      "Html.raw(\"<img alt='logo'>\").at_css(:img).attributes"
    ]
  }
}.freeze
TAGS = 
%w[
  a
  abbr
  address
  area
  article
  aside
  audio
  b
  base
  bdi
  bdo
  blockquote
  body
  br
  button
  canvas
  caption
  cite
  code
  col
  colgroup
  data
  datalist
  dd
  del
  details
  dfn
  dialog
  div
  dl
  dt
  em
  embed
  fieldset
  figcaption
  figure
  footer
  form
  h1
  h2
  h3
  h4
  h5
  h6
  head
  header
  hgroup
  hr
  html
  i
  iframe
  img
  input
  ins
  kbd
  label
  legend
  li
  link
  main
  map
  mark
  meta
  meter
  nav
  noscript
  object
  ol
  optgroup
  option
  output
  p
  picture
  pre
  progress
  q
  rp
  rt
  ruby
  s
  samp
  script
  section
  select
  slot
  small
  source
  span
  strong
  style
  sub
  summary
  sup
  table
  tbody
  td
  template
  textarea
  tfoot
  th
  thead
  time
  title
  tr
  track
  u
  ul
  var
  video
  wbr
].freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args, **_kargs, &_block) ⇒ Html

Returns a new instance of Html.



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# File 'lib/code/object/html.rb', line 259

def initialize(*args, **_kargs, &_block)
  self.raw =
    if args.first.is_an?(Html)
      args.first.raw
    elsif args.first.is_a?(::Nokogiri::XML::NodeSet) ||
          args.first.is_a?(Nokogiri::XML::Node)
      args.first
    else
      source = args.first.to_s
      Nokogiri.HTML(source)
    end
end

Class Method Details

.call(**args) ⇒ Object 



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# File 'lib/code/object/html.rb', line 272

def self.call(**args)
  code_operator = args.fetch(:operator, nil).to_code
  code_arguments = args.fetch(:arguments, []).to_code
  globals = multi_fetch(args, *GLOBALS)

  case code_operator.to_s
  when "escape"
    sig(args) { Object.maybe }
    code_escape(*code_arguments.raw, **globals)
  when "unescape"
    sig(args) { Object.maybe }
    code_unescape(*code_arguments.raw, **globals)
  when "join"
    sig(args) { [Object.maybe, Object.maybe] }
    code_join(*code_arguments.raw, **globals)
  when "text"
    sig(args) { Object.maybe }
    code_text(code_arguments.code_first, **globals)
  when "raw"
    sig(args) { Object.maybe }
    code_raw(code_arguments.code_first, **globals)
  else
    if TAGS.include?(code_operator.to_s.downcase)
      sig(args) { [Dictionary.maybe, Function.maybe] }
      code_tag(code_operator, *code_arguments.raw, **globals)
    else
      super
    end
  end
end

.code_escape(value_or_function = nil, **globals) ⇒ Object 



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# File 'lib/code/object/html.rb', line 358

def self.code_escape(value_or_function = nil, **globals)
  code_value =
    if value_or_function.is_a?(Function)
      begin
        value_or_function.to_code.call(**globals)
      rescue Error::Next => e
        e.code_value
      end
    else
      value_or_function.to_code
    end

  String.new(CGI.escapeHTML(code_value.to_s))
rescue Error::Break => e
  e.code_value
end

.code_join(first = nil, second = nil, **globals) ⇒ Object 



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# File 'lib/code/object/html.rb', line 392

def self.code_join(first = nil, second = nil, **globals)
  if second.is_a?(Function)
    code_contents =
      begin
        second.to_code.call(**globals)
      rescue Error::Next => e
        e.code_value
      end
    code_separator = first.to_code
  else
    code_contents = first.to_code
    code_separator = second.to_code
  end

  fragment = Nokogiri::HTML::DocumentFragment.parse("")

  return Html.new(fragment) if code_contents.nothing?
  return Html.new(fragment) unless code_contents.is_a?(List)

  code_contents.raw.each.with_index do |code_content, index|
    content =
      if code_content.is_an?(Html)
        fragment_from_html(code_content)
      else
        Nokogiri::XML::Text.new(code_content.to_s, fragment.document)
      end

    separator =
      if code_separator.is_an?(Html)
        fragment_from_html(code_separator)
      else
        Nokogiri::XML::Text.new(code_separator.to_s, fragment.document)
      end

    fragment.add_child(separator) unless index.zero?
    fragment.add_child(content)
  end

  Html.new(fragment)
rescue Error::Break => e
  e.code_value
end

.code_raw(value_or_function = nil, **globals) ⇒ Object 



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# File 'lib/code/object/html.rb', line 457

def self.code_raw(value_or_function = nil, **globals)
  code_value =
    if value_or_function.is_a?(Function)
      begin
        value_or_function.to_code.call(**globals)
      rescue Error::Next => e
        e.code_value
      end
    else
      value_or_function.to_code
    end

  if code_value.is_an?(Html)
    Html.new(fragment_from_html(code_value))
  else
    Html.new(Nokogiri::HTML::DocumentFragment.parse(code_value.to_s))
  end
rescue Error::Break => e
  e.code_value
end

.code_tag(name, attributes_or_function = {}, function = nil, **globals) ⇒ Object 



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# File 'lib/code/object/html.rb', line 303

def self.code_tag(
  name,
  attributes_or_function = {},
  function = nil,
  **globals
)
  code_name = name.to_code

  if attributes_or_function.is_a?(Function)
    code_attributes = {}.to_code
    code_function = attributes_or_function.to_code
  else
    code_attributes = attributes_or_function.to_code
    code_function = function.to_code
  end

  fragment = Nokogiri::HTML::DocumentFragment.parse("")
  node =
    Nokogiri::XML::Node.new(code_name.to_s.downcase, fragment.document)

  code_attributes.raw.each do |code_key, code_value|
    next if code_key.nothing?
    next if code_value.nothing?

    node[code_key.to_s] = code_value.to_s
  end

  if code_function.something?
    code_content =
      begin
        code_function.call(
          arguments: List.new([code_name, code_attributes]),
          **globals
        )
      rescue Error::Next => e
        e.code_value
      end

    content =
      if code_content.is_an?(Html)
        fragment_from_html(code_content)
      else
        Nokogiri::XML::Text.new(code_content.to_s, fragment.document)
      end

    node.add_child(content)
  end

  fragment.add_child(node)

  Html.new(fragment)
rescue Error::Break => e
  e.code_value
end

.code_text(value_or_function = nil, **globals) ⇒ Object 



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# File 'lib/code/object/html.rb', line 435

def self.code_text(value_or_function = nil, **globals)
  code_value =
    if value_or_function.is_a?(Function)
      begin
        value_or_function.to_code.call(**globals)
      rescue Error::Next => e
        e.code_value
      end
    else
      value_or_function.to_code
    end

  fragment = Nokogiri::HTML::DocumentFragment.parse("")
  fragment.add_child(
    Nokogiri::XML::Text.new(code_value.to_s, fragment.document)
  )

  Html.new(fragment)
rescue Error::Break => e
  e.code_value
end

.code_unescape(value_or_function = nil, **globals) ⇒ Object 



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# File 'lib/code/object/html.rb', line 375

def self.code_unescape(value_or_function = nil, **globals)
  code_value =
    if value_or_function.is_a?(Function)
      begin
        value_or_function.to_code.call(**globals)
      rescue Error::Next => e
        e.code_value
      end
    else
      value_or_function.to_code
    end

  String.new(Nokogiri::HTML.fragment(code_value.to_s).text)
rescue Error::Break => e
  e.code_value
end

.fragment_from_html(html) ⇒ Object 



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# File 'lib/code/object/html.rb', line 478

def self.fragment_from_html(html)
  Nokogiri::HTML::DocumentFragment.parse(html.to_html)
end

.function_documentation(scope) ⇒ Object 



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# File 'lib/code/object/html.rb', line 139

def self.function_documentation(scope)
  return INSTANCE_FUNCTIONS if scope == :instance
  return CLASS_FUNCTIONS if scope == :class

  {}
end

Instance Method Details

#call(**args) ⇒ Object 



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# File 'lib/code/object/html.rb', line 482

def call(**args)
  code_operator = args.fetch(:operator, nil).to_code
  code_arguments = args.fetch(:arguments, []).to_code
  code_value = code_arguments.code_first
  globals = multi_fetch(args, *GLOBALS)

  case code_operator.to_s
  when "css"
    sig(args) { String }
    code_css(code_value)
  when "at_css"
    sig(args) { String }
    code_at_css(code_value)
  when "map"
    sig(args) { Function }
    code_map(code_value, **globals)
  when "to_string"
    sig(args)
    code_to_string
  when "to_html"
    sig(args)
    code_to_html
  when "inner_text"
    sig(args)
    code_inner_text
  when "attribute"
    sig(args) { String }
    code_attribute(code_value)
  when "attributes"
    sig(args)
    code_attributes
  else
    super
  end
end

#code_at_css(query) ⇒ Object 



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# File 'lib/code/object/html.rb', line 524

def code_at_css(query)
  code_query = query.to_code

  Html.new(raw.at_css(code_query.raw))
end

#code_attribute(value = nil) ⇒ Object 



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# File 'lib/code/object/html.rb', line 567

def code_attribute(value = nil)
  code_value = value.to_code
  String.new(raw.attr(code_value.to_s))
end

#code_attributes ⇒ Object 



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# File 'lib/code/object/html.rb', line 572

def code_attributes
  node = raw.is_a?(::Nokogiri::XML::NodeSet) ? raw.first : raw
  return Dictionary.new if node.blank?

  Dictionary.new(
    node.attribute_nodes.to_h do |attribute|
      [attribute.name.to_code, attribute.value.to_code]
    end
  )
end

#code_css(query) ⇒ Object 



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# File 'lib/code/object/html.rb', line 518

def code_css(query)
  code_query = query.to_code

  Html.new(raw.css(code_query.raw))
end

#code_inner_text ⇒ Object 



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# File 'lib/code/object/html.rb', line 563

def code_inner_text
  code_to_string
end

#code_map(argument, **globals) ⇒ Object 



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# File 'lib/code/object/html.rb', line 530

def code_map(argument, **globals)
  code_argument = argument.to_code

  List.new(
    raw.map.with_index do |element, index|
      code_argument.call(
        arguments: List.new([element.to_code, Integer.new(index), self]),
        **globals
      )
    rescue Error::Next => e
      e.code_value
    end
  )
rescue Error::Break => e
  e.code_value
end

#code_to_html ⇒ Object 



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# File 'lib/code/object/html.rb', line 555

def code_to_html
  String.new(raw.to_html)
end

#code_to_string ⇒ Object 



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# File 'lib/code/object/html.rb', line 559

def code_to_string
  String.new(raw.text)
end

#to_html ⇒ Object 



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# File 'lib/code/object/html.rb', line 551

def to_html
  raw.to_html
end

#to_s ⇒ Object 



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# File 'lib/code/object/html.rb', line 547

def to_s
  raw.text
end