Class: TBMX::CommandParser

Inherits:
ParserNode show all
Defined in:
lib/tbmx.rb

Constant Summary collapse

@@action_view = 
nil
@@controller = 
nil

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(command, expressions) ⇒ CommandParser

Returns a new instance of CommandParser.

Raises:

  • (ArgumentError) 


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# File 'lib/tbmx.rb', line 238

def initialize(command, expressions)
  raise ArgumentError if not command.is_a? WordToken
  @command = command
  raise ArgumentError if not expressions.is_a? Array
  expressions.each {|expression| raise ArgumentError if not expression.kind_of? ParserNode}
  @expressions = expressions
end

Instance Attribute Details

#command ⇒ Object (readonly)

Returns the value of attribute command.



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# File 'lib/tbmx.rb', line 236

def command
  @command
end

#expressions ⇒ Object (readonly)

Returns the value of attribute expressions.



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# File 'lib/tbmx.rb', line 236

def expressions
  @expressions
end

Class Method Details

.action_view=(new) ⇒ Object 



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# File 'lib/tbmx.rb', line 482

def action_view=(new)
  @@action_view = new
end

.controller=(new) ⇒ Object 



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# File 'lib/tbmx.rb', line 486

def controller=(new)
  @@controller = new
end

.parse(tokens) ⇒ Object

Raises:



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# File 'lib/tbmx.rb', line 451

def parse(tokens)
  expressions = []
  rest = tokens
  backslash, command, left_brace = rest.shift(3)
  right_brace = nil
  raise ParseError if not backslash.is_a? BackslashToken
  raise ParseError if not command.is_a? WordToken
  if not left_brace.is_a? LeftBraceToken # A command with no interior.
    rest.unshift left_brace if not left_brace.is_a? WhitespaceToken
    return [CommandParser.new(command, []), rest]
  end
  while rest.length > 0
    if rest.first.is_a? WordToken
      expressions << rest.shift
    elsif rest.first.is_a? WhitespaceToken
      expressions << rest.shift
    elsif rest.first.is_a? BackslashToken
      result, rest = CommandParser.parse(rest)
      expressions << result
    elsif rest.first.is_a? RightBraceToken
      right_brace = rest.shift
      return [CommandParser.new(command, expressions), rest]
    else
      raise ParseError
    end
  end
  if right_brace.nil? # Allow a forgotten final right brace.
    return [CommandParser.new(command, expressions), rest]
  end
end

Instance Method Details

#bookmarks_folder_id_command_handler ⇒ Object 



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# File 'lib/tbmx.rb', line 443

def bookmarks_folder_id_command_handler
  id_command_handler Folder, "folder", "folders", "folders/bookmarks_inline", "bookmarks"
end

#command_error(message) ⇒ Object 



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# File 'lib/tbmx.rb', line 246

def command_error(message)
  %{<span style="color: red">[#{message}]</span>}
end

#folder_id_command_handler ⇒ Object 



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# File 'lib/tbmx.rb', line 439

def folder_id_command_handler
  id_command_handler Folder
end

#html_tag(tag) ⇒ Object 



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# File 'lib/tbmx.rb', line 352

def html_tag(tag)
  "<#{tag}>" + expressions.map(&:to_html).join + "</#{tag}>"
end

#id_command_handler(klass, singular = klass.to_s.camelcase_to_snakecase, plural = singular.pluralize, partial = "#{plural}/inline", view = "") ⇒ Object 



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# File 'lib/tbmx.rb', line 406

def id_command_handler(klass,
                       singular = klass.to_s.camelcase_to_snakecase,
                       plural = singular.pluralize,
                       partial = "#{plural}/inline",
                       view="")
  id = expressions.select {|expr| expr.is_a? WordToken}.first
  if not id
    command_error "#{singular}_id: error: no #{singular} ID specified"
  elsif not id.to_s =~ /\A[0-9]+\z/
    command_error "#{singular}_id: error: invalid #{singular} ID specified"
  else
    if @@action_view.kind_of? ActionView::Base
      thing = klass.find Integer(id.to_s)
      if thing
        @@action_view.render partial: partial,
                             locals: {singular.to_sym => thing}
      else
        command_error "unknown #{singular} ID #{id.to_s}"
      end
    else
      tb_href "/#{plural}/#{id.to_s}/#{view}", "#{klass} ##{id.to_s}"
    end
  end
end

#injectable_math_function_handler(initial, function) ⇒ Object 



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# File 'lib/tbmx.rb', line 375

def injectable_math_function_handler(initial, function)
  numbers_from_expressions.inject initial, function
end

#link_id_command_handler ⇒ Object 



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# File 'lib/tbmx.rb', line 431

def link_id_command_handler
  id_command_handler Link
end

#math_function_handler(function) ⇒ Object 



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# File 'lib/tbmx.rb', line 383

def math_function_handler(function)
  Math.send function, numbers_from_expressions.first
end

#number_from_expression ⇒ Object 



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# File 'lib/tbmx.rb', line 371

def number_from_expression
  numbers_from_expressions.first
end

#numbers_from_expressions ⇒ Object 



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# File 'lib/tbmx.rb', line 360

def numbers_from_expressions
  expressions
    .map do |number|
      begin
        Float(number.to_html)
      rescue ArgumentError
        nil
      end
    end.reject &:nil?
end

#reducable_math_function_handler(function) ⇒ Object 



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# File 'lib/tbmx.rb', line 379

def reducable_math_function_handler(function)
  numbers_from_expressions.reduce function
end

#tag_id_command_handler ⇒ Object 



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# File 'lib/tbmx.rb', line 435

def tag_id_command_handler
  id_command_handler Tag
end

#tb_href(target, string) ⇒ Object 



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# File 'lib/tbmx.rb', line 356

def tb_href(target, string)
  %{<a href="#{TB_COM}/#{target}">#{string}</a>}
end

#to_html ⇒ Object 



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# File 'lib/tbmx.rb', line 250

def to_html
  case command.word
  when "backslash", "bslash"
    "\\"
  when "left-brace", "left_brace", "leftbrace", "lbrace", "opening-brace", "opening_brace",
       "openingbrace", "obrace"
    "{"
  when "right-brace", "right_brace", "rightbrace", "rbrace", "closing-brace", "closing_brace",
       "closingbrace", "cbrace"
    "}"
  when "br", "newline"
    "\n</br>\n"
  when "bold", "b", "textbf"
    html_tag :b
  when "del", "s", "strike", "strikethrough", "strikeout"
    html_tag :del
  when "italic", "i", "textit"
    html_tag :i
  when "underline", "u"
    html_tag :u
  when "tt", "texttt", "teletype", "typewriter"
    html_tag :tt
  when "small"
    html_tag :small
  when "big"
    html_tag :big
  when "subscript", "sub"
    html_tag :sub
  when "superscript", "sup"
    html_tag :sup
  when "user", "user-id", "user_id"
    user_command_handler
  when "link-id", "link_id"
    link_id_command_handler
  when "keyword-id", "keyword_id"
    keyword_id_command_handler
  when "tag-id", "tag_id"
    tag_id_command_handler
  when "folder-id", "folder_id"
    folder_id_command_handler
  when "bookmarks-folder-id", "bookmarks_folder_id", "bookmarks_folder-id", "bookmarks-folder_id",
       "bookmark-folder-id",  "bookmark_folder_id",  "bookmark_folder-id",  "bookmark-folder_id"
    bookmarks_folder_id_command_handler
  when "pi"
    "#{Math::PI}"
  when "e"
    "#{Math::E}"
  when "+"
    injectable_math_function_handler 0, :+
  when "-"
    if (numbers = numbers_from_expressions).length == 1
      injectable_math_function_handler 0, :-
    else
      reducable_math_function_handler :-
    end
  when "*"
    injectable_math_function_handler 1, :*
  when "/"
    if (numbers = numbers_from_expressions).length == 1
      1 / numbers.first
    else
      reducable_math_function_handler :/
    end
  when "%"
    injectable_math_function_handler numbers_from_expressions.first, :%
  when "^", "**"
    number, exponent = numbers_from_expressions
    number.send :**, exponent
  when "sin", "cos", "tan",
    "asin", "acos", "atan",
    "sinh", "cosh", "tanh",
    "asinh", "acosh", "atanh",
    "erf", "erfc",
    "gamma", "lgamma",
    "log10", "log2",
    "sqrt"
    math_function_handler command.word.to_sym
  when "d2r", "deg->rad", "degrees->radians"
    degrees = number_from_expression
    radians = degrees * Math::PI / 180.0
    radians
  when "r2d", "rad->deg", "radians->degrees"
    radians = number_from_expression
    degrees = radians * 180.0 / Math::PI
    degrees
  when "log"
    base, number = numbers_from_expressions
    if number.nil?
      Math.log base
    else
      Math.log number, base
    end
  when "ldexp"
    fraction, exponent = numbers_from_expressions
    Math.ldexp fraction, exponent
  when "hypot"
    Math.sqrt numbers_from_expressions.map {|n| n**2}
  else
    command_error "unknown command #{command.to_html}"
  end
end

#user_command_handler ⇒ Object 



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# File 'lib/tbmx.rb', line 387

def user_command_handler
  user = expressions.select {|expr| expr.is_a? WordToken}.first
  if not user
    command_error "user: error: no user specified"
  else
    if @@action_view.kind_of? ActionView::Base
      the_user = User.smart_find user.to_s
      if the_user
        @@action_view.render partial: 'users/name_link',
                             locals: {the_user: the_user}
      else
        command_error "unknown user #{user.to_s}"
      end
    else
      tb_href "users/#{user}", user.to_s
    end
  end
end