Class: Plurimath::Utility

Inherits:
Object
  • Object
show all
Defined in:
lib/plurimath/utility.rb

Constant Summary collapse

FONT_STYLES = 
{
  "double-struck": Math::Function::FontStyle::DoubleStruck,
  "sans-serif-bold-italic": Math::Function::FontStyle::SansSerifBoldItalic,
  "sans-serif-italic": Math::Function::FontStyle::SansSerifItalic,
  "bold-sans-serif": Math::Function::FontStyle::BoldSansSerif,
  "sans-serif": Math::Function::FontStyle::SansSerif,
  "bold-fraktur": Math::Function::FontStyle::BoldFraktur,
  "bold-italic": Math::Function::FontStyle::BoldItalic,
  "bold-script": Math::Function::FontStyle::BoldScript,
  mbfitsans: Math::Function::FontStyle::SansSerifBoldItalic,
  monospace: Math::Function::FontStyle::Monospace,
  mathfrak: Math::Function::FontStyle::Fraktur,
  mitsans: Math::Function::FontStyle::SansSerifItalic,
  mbfsans: Math::Function::FontStyle::BoldSansSerif,
  mbffrak: Math::Function::FontStyle::BoldFraktur,
  mathcal: Math::Function::FontStyle::Script,
  fraktur: Math::Function::FontStyle::Fraktur,
  mbfscr: Math::Function::FontStyle::BoldScript,
  mathbb: Math::Function::FontStyle::DoubleStruck,
  double: Math::Function::FontStyle::DoubleStruck,
  mathtt: Math::Function::FontStyle::Monospace,
  mathsf: Math::Function::FontStyle::SansSerif,
  mathrm: Math::Function::FontStyle::Normal,
  textrm: Math::Function::FontStyle::Normal,
  italic: Math::Function::FontStyle::Italic,
  mathit: Math::Function::FontStyle::Italic,
  mathbf: Math::Function::FontStyle::Bold,
  textbf: Math::Function::FontStyle::Bold,
  script: Math::Function::FontStyle::Script,
  normal: Math::Function::FontStyle::Normal,
  mbfit: Math::Function::FontStyle::BoldItalic,
  msans: Math::Function::FontStyle::SansSerif,
  mfrak: Math::Function::FontStyle::Fraktur,
  mscr: Math::Function::FontStyle::Script,
  bold: Math::Function::FontStyle::Bold,
  bbb: Math::Function::FontStyle::DoubleStruck,
  Bbb: Math::Function::FontStyle::DoubleStruck,
  mtt: Math::Function::FontStyle::Monospace,
  cal: Math::Function::FontStyle::Script,
  mit: Math::Function::FontStyle::Italic,
  mup: Math::Function::FontStyle::Normal,
  mbf: Math::Function::FontStyle::Bold,
  sf: Math::Function::FontStyle::SansSerif,
  tt: Math::Function::FontStyle::Monospace,
  fr: Math::Function::FontStyle::Fraktur,
  rm: Math::Function::FontStyle::Normal,
  cc: Math::Function::FontStyle::Script,
  ii: Math::Function::FontStyle::Italic,
  bb: Math::Function::FontStyle::Bold,
  bf: Math::Function::FontStyle::Bold,
}.freeze
ALIGNMENT_LETTERS = 
{
  c: "center",
  r: "right",
  l: "left",
}.freeze
UNARY_CLASSES = 
%w[
  arccos
  arcsin
  arctan
  liminf
  limsup
  right
  sech
  sinh
  tanh
  cosh
  coth
  csch
  left
  max
  min
  sec
  sin
  sup
  deg
  det
  dim
  exp
  gcd
  glb
  lub
  lcm
  ker
  tan
  cos
  cot
  csc
  ln
  lg
].freeze
MUNDER_CLASSES = 
%w[
  ubrace
  obrace
  right
  max
  min
].freeze
PARENTHESIS = 
{
  "〈": "〉",
  "⌊": "⌋",
  "⌈": "⌉",
  "‖": "‖",
  "{": "}",
  "[": "]",
  "|": "|",
  "(": ")",
  "{": "}",
  "[": "]",
}.freeze
TEXT_CLASSES = 
%w[
  unicode
  symbol
  number
  text
].freeze
TABLE_SUPPORTED_ATTRS = 
%i[
  columnlines
  rowlines
  frame
].freeze
MPADDED_ATTRS = 
%i[
  height
  depth
  width
].freeze
MGLYPH_ATTRS = 
%i[
  height
  width
  index
  alt
  src
].freeze
UNICODEMATH_MENCLOSE_FUNCTIONS = 
{
  underline: "bottom",
  underbar: "bottom",
  longdiv: "longdiv",
  xcancel: "updiagonalstrike downdiagonalstrike",
  bcancel: "updiagonalstrike",
  ellipse: "circle",
  circle: "circle",
  cancel: "downdiagonalstrike",
  rrect: "roundedbox",
  rect: "box",
}.freeze
MASK_CLASSES = 
{
  1 => 'top',
  2 => 'bottom',
  4 => 'left',
  8 => 'right',
  16 => 'horizontalstrike',
  32 => 'verticalstrike',
  64 => 'downdiagonalstrike',
  128 => 'updiagonalstrike'
}.freeze

Class Method Summary collapse

Class Method Details

.accent_value(accent, function: false) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 760

def accent_value(accent, function: false)
  if accent[:accent_symbols]
    Math::Symbol.new(UnicodeMath::Constants::ACCENT_SYMBOLS[accent[:accent_symbols].to_sym] || accent[:accent_symbols])
  else
    accent[:first_value] || filter_values(accent[:prime_accent_symbols])
  end
end

.attr_is_accent(attrs, value) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 453

def attr_is_accent(attrs, value)
  if value.last.is_a?(Math::Function::UnaryFunction)
    value.last.parameter_one = value.shift if value.length > 1
    value.last.attributes = attrs.transform_values { |v| YAML.safe_load(v) }
  end
  value
end

.attr_is_function(attrs, value) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 461

def attr_is_function(attrs, value)
  case attrs
  when Math::Function::Fenced
    attrs.parameter_two = value.compact
    attrs
  when Math::Function::FontStyle
    attrs.parameter_one = filter_values(value)
    attrs
  when Math::Function::Color
    color_value = filter_values(value)
    if attrs.parameter_two
      attrs.parameter_two.parameter_one = color_value
    else
      attrs.parameter_two = color_value
    end
    attrs
  end
end

.base_is_prime?(base) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/plurimath/utility.rb', line 872

def base_is_prime?(base)
  UnicodeMath::Constants::PREFIXED_PRIMES.key(base.parameter_two.value) ||
    (base.parameter_two.value == "'")
end

.base_is_sub_or_sup?(base) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/plurimath/utility.rb', line 877

def base_is_sub_or_sup?(base)
  if base.is_a?(Math::Formula)
    base_is_sub_or_sup?(base.value.first)
  elsif base.is_a?(Math::Function::Fenced)
    base_is_sub_or_sup?(base.parameter_two.first)
  elsif base.is_a?(Math::Symbol) || base.is_a?(Math::Number)
    base.mini_sub_sized || base_mini_sup_sized
  end
end

.base_recursion(sub_script, sub_recursion) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 831

def base_recursion(sub_script, sub_recursion)
  base_class = Math::Function::Base
  new_sub = sub_recursion.parameter_one
  if new_sub.is_a?(base_class)
    base_recursion(sub_script, new_sub)
    sub_recursion
  else
    sub_recursion.parameter_one = base_class.new(sub_script, new_sub)
    sub_recursion
  end
end

.binary_function_classes(mrow, under: false) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 602

def binary_function_classes(mrow, under: false)
  binary_class = Math::Function::BinaryFunction
  mrow.each_with_index do |object, ind|
    mrow[ind] = mathml_unary_classes([object]) if object.is_a?(String)
    object = mrow[ind]
    next unless object.is_a?(binary_class)

    if object.is_a?(Math::Function::Mod)
      next unless mrow.length >= 1

      object.parameter_one = mrow.delete_at(ind - 1) unless ind.zero?
      object.parameter_two = mrow.delete_at(ind)
    elsif Mathml::Constants::UNICODE_SYMBOLS.invert[object.class_name] && mrow.length > 1
      next if object.parameter_one || mrow.length > 2
      next object.parameter_one = mrow.delete_at(ind - 1) if under && ind <= 1

      object.parameter_one = mrow.delete_at(ind + 1)
    end
  end
end

.enclosure_attrs(mask) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 898

def enclosure_attrs(mask)
  raise "enclosure mask is not between 0 and 255" if (mask.nil? || mask < 0 || mask > 255)

  ret = ""
  unless mask.nil?
    mask ^= 15
    bin_mask = mask.to_s(2).reverse
    classes = bin_mask.chars.each_with_index.map { |bit, i| MASK_CLASSES[2**i] if bit == '1' }.compact
    ret = classes.join(' ')
  end
  ret
end

.fenceable_classes(mrow = []) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 660

def fenceable_classes(mrow = [])
  return false unless mrow.length > 1

  if paren_able?(PARENTHESIS, mrow)
    open_paren = mrow.shift
    close_paren = mrow.pop
    if mrow.length == 1 && mrow.first.is_a?(Math::Function::Table)
      table = mrow.first
      table.open_paren = open_paren.value
      table.close_paren = close_paren.value
    else
      mrow.replace(
        [
          Math::Function::Fenced.new(open_paren, mrow.dup, close_paren),
        ],
      )
    end
  end
end

.filter_math_zone_values(value) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 692

def filter_math_zone_values(value)
  return [] if value&.empty?

  new_arr = []
  temp_array = []
  skip_index = nil
  value.each_with_index do |obj, index|
    object = obj.dup
    next if index == skip_index
    next temp_array << object.value if TEXT_CLASSES.include?(object.class_name)

    new_arr << Math::Function::Text.new(temp_array.join(" ")) if temp_array.any?
    temp_array = []
    new_arr << object
  end
  new_arr << Math::Function::Text.new(temp_array.join(" ")) if temp_array.any?
  new_arr
end

.filter_table_data(table_data) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 222

def filter_table_data(table_data)
  table_data.each_with_index do |object, ind|
    if symbol_value(object, "-")
      table_data[ind] = Math::Formula.new(
        [object, table_data.delete_at(ind.next)],
      )
    end
  end
  table_data
end

.filter_values(array) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 291

def filter_values(array)
  return array unless array.is_a?(Array) || array.is_a?(Math::Formula)

  array = array.is_a?(Math::Formula) ? array.value : array.flatten.compact
  return Math::Formula.new(array) if array.length > 1

  array.first
end

.find_pos_chr(fonts_array, key) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 335

def find_pos_chr(fonts_array, key)
  fonts_array.find { |d| d.is_a?(Hash) && d[key] }
end

.frac_values(object) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 533

def frac_values(object)
  case object
  when Math::Formula
    object.value.any? { |d| symbol_value(d, ",") }
  when Array
    object.any? { |d| symbol_value(d, ",") }
  end
end

.fractions(numerator, denominator, options = nil) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 777

def fractions(numerator, denominator, options = nil)
  frac_class = Math::Function::Frac
  if denominator.is_a?(frac_class)
    if denominator.parameter_one.is_a?(frac_class)
      recursion_fraction(denominator, numerator, options)
    else
      denominator.parameter_one = frac_class.new(
        unfenced_value(numerator, paren_specific: true),
        unfenced_value(denominator.parameter_one, paren_specific: true),
        options
      )
    end
    denominator
  else
    frac_class.new(
      unfenced_value(numerator, paren_specific: true),
      unfenced_value(denominator, paren_specific: true),
      options
    )
  end
end

.get_class(text) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 245

def get_class(text)
  text = text.to_s.split("_").map(&:capitalize).join
  Object.const_get(
    "Plurimath::Math::Function::#{text}",
  )
end

.get_table_class(text) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 233

def get_table_class(text)
  Object.const_get(
    "Plurimath::Math::Function::Table::#{text.to_s.capitalize}",
  )
end

.html_entity_to_unicode(string) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 390

def html_entity_to_unicode(string)
  entities = HTMLEntities.new
  entities.decode(string)
end

.identity_matrix(size) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 887

def identity_matrix(size)
  matrix = Array.new(size) { Array.new(size, 0) }
  size.times { |i| matrix[i][i] = 1 }
  matrix.map do |tr|
    tr.map.with_index do |td, i|
      tr[i] = Math::Function::Td.new([Math::Number.new(td.to_s)])
    end
    Math::Function::Tr.new(tr)
  end
end

.join_attr_value(attrs, value, unicode_only: false) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 410

def join_attr_value(attrs, value, unicode_only: false)
  if value.any?(String)
    new_value = mathml_unary_classes(value, unicode_only: unicode_only)
    array_value = Array(new_value)
    attrs.nil? ? array_value : join_attr_value(attrs, array_value, unicode_only: unicode_only)
  elsif attrs.nil?
    value
  elsif attrs.is_a?(String) && ["solid", "none"].include?(attrs.split.first.downcase)
    table_separator(attrs.split, value)
  elsif attrs.is_a?(Hash)
    if (attrs.key?(:accent) || attrs.key?(:accentunder))
      attr_is_accent(attrs, value)
    elsif attrs.key?(:linebreak)
      Math::Function::Linebreak.new(value.first, attrs)
    elsif attrs.key?(:bevelled) || attrs.key?(:linethickness)
      Math::Function::Frac.new(value[0], value[1], attrs)
    elsif attrs.key?(:notation)
      value << attrs
    elsif attrs.key?(:separators)
      fenced = Math::Function::Fenced.new(
        symbol_object(attrs[:open] || "("),
        value,
        symbol_object(attrs[:close] || ")"),
      )
      fenced.options = { separators: attrs[:separators] }
      fenced
    elsif TABLE_SUPPORTED_ATTRS.any? { |atr| attrs.key?(atr) }
      Math::Function::Table.new(value, nil, nil, attrs)
    elsif MPADDED_ATTRS.any? { |atr| attrs.key?(atr) }
      Math::Function::Mpadded.new(
        filter_values(value),
        attrs,
      )
    elsif MGLYPH_ATTRS.any? { |atr| attrs.key?(atr) }
      Math::Function::Mglyph.new(
        attrs,
      )
    end
  elsif attrs.is_a?(Math::Core)
    attr_is_function(attrs, value)
  end
end

.left_right_objects(paren, function) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 571

def left_right_objects(paren, function)
  paren = if paren.to_s.match?(/\\\{|\\\}/)
            paren.to_s.gsub(/\\/, "")
          else
            Latex::Constants::LEFT_RIGHT_PARENTHESIS[paren.to_sym]
          end
  get_class(function).new(paren)
end

.mathml_unary_classes(text_array, omml: false, unicode_only: false) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 364

def mathml_unary_classes(text_array, omml: false, unicode_only: false)
  return [] if text_array.empty?

  compacted = text_array.compact
  return filter_values(compacted) unless compacted.any?(String)

  string  = compacted.join
  classes = Mathml::Constants::CLASSES
  unicode = string_to_html_entity(string)
  return Math::Symbol.new(unicode) if unicode_only && unicode

  symbol = Mathml::Constants::UNICODE_SYMBOLS[unicode.strip.to_sym]
  if classes.include?(symbol&.strip)
    get_class(symbol.strip).new
  elsif classes.any?(string&.strip)
    get_class(string.strip).new
  else
    omml ? text_classes(string) : Math::Symbol.new(unicode)
  end
end

.mrow_left_right(mrow = []) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 586

def mrow_left_right(mrow = [])
  object = mrow.first
  !(
    ((object.is_a?(Math::Function::TernaryFunction) && object.any_value_exist?) && (mrow.length <= 2)) ||
    (object.is_a?(Math::Function::UnaryFunction) && mrow.length == 1)
  )
end

.multiscript(values) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 480

def multiscript(values)
  values.slice_before("mprescripts").map do |value|
    base_value   = value.shift
    value        = nil_to_none_object(value)
    part_val     = value.partition.with_index { |_, i| i.even? }
    first_value  = part_val[0].empty? ? nil : part_val[0]
    second_value = part_val[1].empty? ? nil : part_val[1]
    if base_value.to_s.include?("mprescripts")
      [first_value, second_value]
    else
      Math::Function::PowerBase.new(
        filter_values(base_value),
        filter_values(first_value),
        filter_values(second_value),
      )
    end
  end
end

.nary_fonts(nary) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 322

def nary_fonts(nary)
  narypr  = nary.first.flatten.compact
  subsup  = narypr.any?("undOvr") ? "undOvr" : "subSup"
  unicode = narypr.any?(Hash) ? narypr.first[:chr] : "∫"
  Math::Function::Nary.new(
    Math::Symbol.new(string_to_html_entity(unicode)),
    filter_values(nary[1]),
    filter_values(nary[2]),
    filter_values(nary[3]),
    { type: subsup }
  )
end

.nil_to_none_object(value) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 499

def nil_to_none_object(value)
  return value unless value.any?(NilClass) || value.any? { |val| val.is_a?(Array) && val.empty? }

  value.each.with_index do |val, index|
    next unless val.nil? || val.is_a?(Array)

    value[index] = Math::Function::None.new
  end
end

.notations_to_mask(notations) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 911

def notations_to_mask(notations)
  mask = []
  notations.split(" ").each { |notation| mask << MASK_CLASSES.key(notation) }
  mask.inject(*:+)^15
end

.organize_options(table_data, column_align) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 190

def organize_options(table_data, column_align)
  return column_align if column_align.length <= 1

  align = [column_align&.shift]
  table_data.insert(0, *column_align)
  align
end

.organize_table(array, column_align: nil, options: nil) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 162

def organize_table(array, column_align: nil, options: nil)
  table = []
  table_data = []
  table_row = []
  organize_options(array, column_align) if options
  string_columns = column_align&.map(&:value)
  array.each do |data|
    if data&.separate_table
      table_row << Math::Function::Td.new(filter_table_data(table_data).compact)
      table_data = []
      if data.linebreak
        organize_tds(table_row.flatten, string_columns.dup, options)
        table << Math::Function::Tr.new(table_row)
        table_row = []
      end
      next
    end
    table_data << data
  end
  table_row << Math::Function::Td.new(table_data.compact) if table_data
  unless table_row.nil? || table_row.empty?
    organize_tds(table_row.flatten, string_columns.dup, options)
    table << Math::Function::Tr.new(table_row)
  end
  table_separator(string_columns, table, symbol: "|") unless column_align.nil? || column_align.empty?
  table
end

.organize_tds(tr_array, column_align, options) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 211

def organize_tds(tr_array, column_align, options)
  return tr_array if column_align.nil? || column_align.empty?

  column_align.reject! { |string| string == "|" }
  column_align = column_align * tr_array.length if options
  tr_array.map.with_index do |td, ind|
    columnalign = ALIGNMENT_LETTERS[column_align[ind]&.to_sym]
    td.parameter_two = { columnalign: columnalign } if columnalign
  end
end

.ox_element(node, attributes: [], namespace: "") ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 252

def ox_element(node, attributes: [], namespace: "")
  namespace = "#{namespace}:" unless namespace.empty?

  element = Plurimath.xml_engine.new_element("#{namespace}#{node}")
  attributes&.each do |attr_key, attr_value|
    element[attr_key] = attr_value
  end
  element
end

.paren_able?(arr = [], mrow = []) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/plurimath/utility.rb', line 654

def paren_able?(arr = [], mrow = [])
  arr.any? do |opening, closing|
    symbol_value(mrow.first, opening.to_s) && symbol_value(mrow.last, closing.to_s)
  end
end

.populate_function_classes(mrow = []) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 594

def populate_function_classes(mrow = [])
  flatten_mrow = mrow.flatten.compact
  unary_function_classes(flatten_mrow)
  binary_function_classes(flatten_mrow)
  ternary_function_classes(flatten_mrow)
  flatten_mrow
end

.pr_element(main_tag, wi_tag = false, namespace: "") ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 283

def pr_element(main_tag, wi_tag = false, namespace: "")
  tag_name = "#{main_tag}Pr"
  ox_element(
    tag_name,
    namespace: namespace,
  ) << rpr_element(wi_tag: wi_tag)
end

.recursion_fraction(frac, numerator, options) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 799

def recursion_fraction(frac, numerator, options)
  frac_class = Math::Function::Frac
  new_numerator = frac.parameter_one
  if new_numerator.is_a?(frac_class)
    recursion_fraction(new_numerator, numerator, options)
  else
    frac.parameter_one = frac_class.new(
      unfenced_value(numerator, paren_specific: true),
      unfenced_value(frac.parameter_one, paren_specific: true),
      options
    )
    frac
  end
end

.recursive_sub(sub_script, sub_recursion) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 814

def recursive_sub(sub_script, sub_recursion)
  base_class = Math::Function::Base
  if sub_recursion.is_a?(base_class)
    if sub_recursion.parameter_one.is_a?(base_class)
      base_recursion(sub_script, sub_recursion)
    else
      sub_recursion.parameter_one = base_class.new(sub_script, sub_recursion.parameter_one)
    end
    sub_recursion
  else
    base_class.new(
      sub_script,
      sub_recursion,
    )
  end
end

.recursive_sup(sup_script, sup_recursion) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 843

def recursive_sup(sup_script, sup_recursion)
  power_class = Math::Function::Power
  if sup_recursion.is_a?(power_class)
    if sup_recursion.parameter_one.is_a?(power_class)
      sup_recursion(sup_script, sup_recursion)
    else
      sup_recursion.parameter_one = power_class.new(sup_script, sup_recursion.parameter_one)
    end
    sup_recursion
  else
    power_class.new(
      sup_script,
      sup_recursion,
    )
  end
end

.rpr_element(wi_tag: false) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 262

def rpr_element(wi_tag: false)
  rpr_element = ox_element("rPr", namespace: "w")
  attributes = { "w:ascii": "Cambria Math", "w:hAnsi": "Cambria Math" }
  rpr_element << ox_element(
    "rFonts",
    namespace: "w",
    attributes: attributes,
  )
  rpr_element << ox_element("i", namespace: "w") if wi_tag
  rpr_element
end

.sequence_slashed_values(values) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 926

def sequence_slashed_values(values)
  values.each.with_index do |value, index|
    decoded = HTMLEntities.new.decode(value.value)
    slashed = if index == 0
                slashed_values(value.value)
              else
                decoded.match?(/[0-9]/) ? Math::Number.new(decoded) : Math::Symbol.new(decoded)
              end
    values[index] = slashed
  end
  values
end

.slashed_values(value) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 917

def slashed_values(value)
  decoded = HTMLEntities.new.decode(value)
  if decoded.to_s.match?(/^\w+/)
    Math::Function::Text.new("\\#{decoded}")
  else
    Math::Symbol.new(decoded, true)
  end
end

.string_to_html_entity(string) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 385

def string_to_html_entity(string)
  entities = HTMLEntities.new
  entities.encode(string, :hexadecimal)
end

.sub_sup_method?(sub_sup) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/plurimath/utility.rb', line 239

def sub_sup_method?(sub_sup)
  if sub_sup.methods.include?(:class_name)
    Html::Constants::SUB_SUP_CLASSES.value?(sub_sup.class_name.to_sym)
  end
end

.sup_recursion(sup_script, sup_recursion) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 860

def sup_recursion(sup_script, sup_recursion)
  power_class = Math::Function::Power
  new_sup = sup_recursion.parameter_one
  if new_sup.is_a?(power_class)
    sup_recursion(sup_script, new_sup)
    sup_recursion
  else
    sup_recursion.parameter_one = power_class.new(sup_script, new_sup)
    sup_recursion
  end
end

.symbol_object(value) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 552

def symbol_object(value)
  value = case value
          when "ℒ" then "{:"
          when "ℛ" then ":}"
          when "ᑕ" then "&#x2329;"
          when "ᑐ" then "&#x232a;"
          else value
          end
  Math::Symbol.new(value)
end

.symbol_value(object, value) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 350

def symbol_value(object, value)
  (object.is_a?(Math::Symbol) && object.value.include?(value)) ||
    (value == "\\\\" && object.is_a?(Math::Function::Linebreak))
end

.table_options(table_data) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 198

def table_options(table_data)
  rowline = ""
  table_data.map do |tr|
    if symbol_value(tr&.parameter_one&.first&.parameter_one&.first, "&#x23af;")
      rowline += "solid "
    else
      rowline += "none "
    end
  end
  options = { rowline: rowline.strip } if rowline.include?("solid")
  options || {}
end

.table_separator(separator, value, symbol: "solid") ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 395

def table_separator(separator, value, symbol: "solid")
  sep_symbol = Math::Function::Td.new([Math::Symbol.new("|")])
  separator&.each_with_index do |sep, ind|
    next unless sep == symbol

    value.map do |val|
      val.parameter_one.insert((ind + 1), sep_symbol) if symbol == "solid"
      val.parameter_one.insert(ind, sep_symbol) if symbol == "|"
      (val.parameter_one[val.parameter_one.index(nil)] = Math::Function::Td.new([])) rescue nil
      val
    end
  end
  value
end

.table_td(object) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 542

def table_td(object)
  new_object = case object
               when Math::Function::Td
                 object
               else
                 Math::Function::Td.new([object])
               end
  Array(new_object)
end

.td_value(td_object) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 355

def td_value(td_object)
  str_classes = [String, Parslet::Slice]
  if str_classes.include?(td_object.class) && td_object.to_s.empty?
    return Math::Function::Text.new(nil)
  end

  td_object
end

.td_values(objects, slicer) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 339

def td_values(objects, slicer)
  sliced = objects.slice_when { |object, _| symbol_value(object, slicer) }
  tds = sliced.map do |slice|
    Math::Function::Td.new(
      slice.delete_if { |d| symbol_value(d, slicer) }.compact,
    )
  end
  tds << Math::Function::Td.new([]) if symbol_value(objects.last, slicer)
  tds
end

.ternary_function_classes(mrow) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 639

def ternary_function_classes(mrow)
  ternary_class = Math::Function::TernaryFunction
  if mrow.any?(ternary_class) && mrow.length > 1
    mrow.each_with_index do |object, ind|
      if object.is_a?(ternary_class)
        next if [Math::Function::Fenced, Math::Function::Multiscript].include?(object.class)
        next unless object.parameter_one || object.parameter_two
        next if object.parameter_three

        object.parameter_three = filter_values(mrow.delete_at(ind + 1))
      end
    end
  end
end

.text_classes(text) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 300

def text_classes(text)
  return nil unless text

  text = filter_values(text) unless text.is_a?(String)
  return text if text.is_a?(Math::Core)

  if text&.scan(/[[:digit:]]/)&.length == text&.length
    Math::Number.new(text)
  elsif text&.match?(/[a-zA-Z]/)
    Math::Function::Text.new(text)
  else
    text = string_to_html_entity(text)
            .gsub("&#x26;", "&")
            .gsub("&#x3c;", "<")
            .gsub("&#x27;", "'")
            .gsub("&#xa0;", " ")
            .gsub("&#x3e;", ">")
            .gsub("&#xa;", "\n")
    Math::Symbol.new(text)
  end
end

.transform_accents(accents) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 728

def transform_accents(accents)
  accents.reduce do |function, accent|
    if function.is_a?(Hash)
      if function[:prime_accent_symbols]
        Math::Function::Power.new(
          unfenced_value(accent_value(function, function: true), paren_specific: true),
          accent_value(accent),
        )
      else
        Math::Function::Overset.new(
          accent_value(accent),
          unfenced_value(accent_value(function, function: true), paren_specific: true),
          { accent: true }
        )
      end
    else
      if accent[:prime_accent_symbols]
        Math::Function::Power.new(
          unfenced_value(function, paren_specific: true),
          accent_value(accent),
        )
      else
        Math::Function::Overset.new(
          accent_value(accent),
          unfenced_value(function, paren_specific: true),
          { accent: true }
        )
      end
    end
  end
end

.unary_function_classes(mrow) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 623

def unary_function_classes(mrow)
  unary_class = Math::Function::UnaryFunction
  if mrow.any?(String) || mrow.any?(unary_class)
    mrow.each_with_index do |object, ind|
      mrow[ind] = mathml_unary_classes([object]) if object.is_a?(String)
      object = mrow[ind] if object.is_a?(String)
      next unless object.is_a?(unary_class)
      next if object.is_a?(Math::Function::Text)
      next if object.parameter_one || mrow[ind + 1].nil?
      next unless ind.zero?

      object.parameter_one = mrow.delete_at(ind + 1)
    end
  end
end

.unfenced_value(object, paren_specific: false) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 509

def unfenced_value(object, paren_specific: false)
  case object
  when Math::Function::Fenced
    if !paren_specific || (paren_specific && valid_paren?(object))
      filter_values(object.parameter_two)
    else
      object
    end
  when Array
    filter_values(object)
  else
    object
  end
end

.unicode_accents(accents) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 711

def unicode_accents(accents)
  if accents.is_a?(Math::Function::BinaryFunction)
    accents
  else
    if accents.any? { |acc| acc&.dig(:first_value)&.is_a?(Array) }
      accent_value = accents.first[:first_value].pop
      first_value = accents.first[:first_value]
      accents.first[:first_value] = accent_value
      Math::Formula.new(
        first_value + [transform_accents(accents)]
      )
    else
      transform_accents(accents)
    end
  end
end

.unicode_fractions(fractions) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 768

def unicode_fractions(fractions)
  frac_arr = UnicodeMath::Constants::UNICODE_FRACTIONS[fractions.to_sym]
  Math::Function::Frac.new(
    Math::Number.new(frac_arr.first.to_s, ),
    Math::Number.new(frac_arr.last.to_s, ),
    { displaystyle: false, unicodemath_fraction: true }
  )
end

.update_nodes(element, nodes) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 274

def update_nodes(element, nodes)
  nodes&.each do |node|
    next update_nodes(element, node) if node.is_a?(Array)

    element << node unless node.nil?
  end
  element
end

.valid_class(object) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 580

def valid_class(object)
  text = object.extract_class_name_from_text
  (object.extractable? && Asciimath::Constants::SUB_SUP_CLASSES.include?(text)) ||
    Latex::Constants::SYMBOLS[text.to_sym] == :power_base
end

.valid_paren?(object) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/plurimath/utility.rb', line 524

def valid_paren?(object)
  object.parameter_one.value == "(" &&
    object.parameter_three.value == ")" &&
    !object.options.keys.any? { |k| [:open_paren, :close_paren].any?(k.to_sym) } &&
    !object.parameter_one.mini_sup_sized &&
    !object.parameter_three.mini_sub_sized &&
    object.options.empty?
end

.validate_left_right(fields = []) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 563

def validate_left_right(fields = [])
  fields.each do |field|
    if field.is_a?(Math::Formula) && field.value.first.is_a?(Math::Function::Left)
      field.left_right_wrapper = true
    end
  end
end

.validate_math_zone(object) ⇒ Object 



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# File 'lib/plurimath/utility.rb', line 680

def validate_math_zone(object)
  return false unless object

  if object.is_a?(Math::Formula)
    filter_math_zone_values(object.value).find do |d|
      !d.is_a?(Math::Function::Text)
    end
  else
    !TEXT_CLASSES.include?(object.class_name)
  end
end