Class: FormatLine

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

Constant Summary collapse

SimpleFormats = 
{}
Null = 
""
Space = 
" "
Alpha = 
/[A-Za-z]/
AlNum = 
/[A-Za-z0-9_]/
LF = 
"\n"
LBrack = 
"["
Blank = 
[" ", nil, "\n"]
Punc = 
[")", ",", ".", " ", "\n"]
NoAlpha = 
/[^A-Za-z0-9_]/
Param = 
["]", "\n", nil]
Escape =

not an ESC char

"\\"
Syms = 
{ "*" => :b, "_" => :i, "`" => :t, "~" => :s }

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(line) ⇒ FormatLine

Returns a new instance of FormatLine.



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# File 'lib/formatline.rb', line 34

def initialize(line)
  @line = line
  @i = -1
  @token = Null.dup
  @tokenlist = []
end

Instance Attribute Details

#out ⇒ Object (readonly)

Returns the value of attribute out.



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# File 'lib/formatline.rb', line 31

def out
  @out
end

#tokenlist ⇒ Object (readonly)

Returns the value of attribute tokenlist.



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# File 'lib/formatline.rb', line 32

def tokenlist
  @tokenlist
end

Class Method Details

.parse!(line) ⇒ Object 



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# File 'lib/formatline.rb', line 41

def self.parse!(line)
  return nil if line.nil?
  x = self.new(line.chomp)
  t = x.tokenize(line)
  x.evaluate
end

.var_func_parse(str) ⇒ Object 



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# File 'lib/formatline.rb', line 72

def self.var_func_parse(str)
  return nil if str.nil?
  x = self.new(str.chomp)
  x.grab
  loop do 
    case x.curr
      when Escape; x.go; x.add x.curr; x.grab
      when "$"
        x.dollar
      when LF, nil
        break
      else
        x.add x.curr
    end
    x.grab
  end
  x.add_token(:str)
  x.evaluate
end

Instance Method Details

#add(str) ⇒ Object 



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# File 'lib/formatline.rb', line 188

def add(str)
  @token << str unless str.nil?
end

#add_token(kind, token = @token) ⇒ Object 



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# File 'lib/formatline.rb', line 192

def add_token(kind, token = @token)
  @tokenlist << [kind, token] unless token.empty?
  @token = Null.dup
end

#collect!(sym, terminators, param = false) ⇒ Object 



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# File 'lib/formatline.rb', line 298

def collect!(sym, terminators, param=false)
  str = Null.dup   # next is not " ","*","["
  grab
  loop do
    if curr == Escape
      str << grab # ch = escaped char
      grab
      next
    end
    break if terminate?(terminators, curr)
    str << curr    # not a terminator
    grab
  end
  grab if param && curr == "]" # skip right bracket
  add str
end

#curr ⇒ Object 



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# File 'lib/formatline.rb', line 130

def curr
  @line[@i]
end

#dollar ⇒ Object 



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# File 'lib/formatline.rb', line 209

def dollar
  grab
  case curr
    when LF;  add "$";  add_token :str
    when " "; add "$ "; add_token :str
    when nil; add "$";  add_token :str
    when "$"; double_dollar
#     when "."; dollar_dot
    when /[A-Za-z]/
     add_token :str
      var = curr + grab_alpha
      add_token(:var, var)
  else 
    add "$" + curr
    add_token(:string)
  end
end

#double_dollar ⇒ Object 



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# File 'lib/formatline.rb', line 227

def double_dollar
  case next!
    when Space; add_token :string, "$$ "; grab; return
    when LF, nil; add "$$"; add_token :str
    when Alpha
      add_token(:str, @token)
      func = grab_alpha
      add_token(:func, func)
      case next!
        when ":"; param = grab_colon_param; add_token(:colon, param)
        when "["; param = grab_func_param; add_token(:brackets, param)
        else  # do nothing
      end
    else
      grab; add_token :str, "$$" + curr; return
  end
end

#double_marker(char) ⇒ Object 



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# File 'lib/formatline.rb', line 275

def double_marker(char)
  sym = Syms[char]
  grab
  kind = sym   # "string_#{char}".to_sym
  case next!   # first char after **
    when Space, LF, nil
      pre, post = SimpleFormats[sym]
      add_token kind
    else
      str = collect!(sym, Punc)
      grab unless next!.nil?
      add_token kind, str
  end
end

#embed(sym, str) ⇒ Object 



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# File 'lib/formatline.rb', line 92

def embed(sym, str)
  pre, post = SimpleFormats[sym]
  pre + str + post
end

#embedded? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/formatline.rb', line 342

def embedded?
  ! (['"', "'", " ", nil].include? prev)
end

#evaluate(tokens = @tokenlist) ⇒ Object 



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# File 'lib/formatline.rb', line 97

def evaluate(tokens = @tokenlist)
  @out = ""
  return "" if tokens.empty?
  gen = tokens.each
  token = gen.next
  loop do 
    break if token.nil? 
    sym, val = *token
    case sym
      when :str
        @out << val unless val == "\n"   # BUG
      when :var
        @out << varsub(val)
      when :func 
        param = nil
        arg = gen.peek
        if [:colon, :brackets].include? arg[0] 
          arg = gen.next  # for real
          param = arg[1]
          param = FormatLine.var_func_parse(param)
        end
        @out << funcall(val, param)
      when :b, :i, :t, :s
        val = FormatLine.var_func_parse(val)
        @out << embed(sym, val)
    else
      add_token :str
    end
    token = gen.next
  end
  @out
end

#funcall(name, param) ⇒ Object

From FormatLine:



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# File 'lib/formatline.rb', line 319

def funcall(name, param)
  result = 
    if self.respond_to?("func_" + name.to_s)
      self.send("func_" + name.to_s, param)
    else
      fobj = ::Livetext::Functions.new
      fobj.send(name, param)
    end
  result
end

#grab ⇒ Object 



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# File 'lib/formatline.rb', line 142

def grab
  @line[@i+=1]
end

#grab_alpha ⇒ Object 



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# File 'lib/formatline.rb', line 197

def grab_alpha
  str = Null.dup
  grab
  loop do
    break if curr.nil?
    str << curr
    break if terminate?(NoAlpha, next!)
    grab
  end
  str
end

#grab_colon_param ⇒ Object 



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# File 'lib/formatline.rb', line 146

def grab_colon_param
  grab  # grab :
  param = ""
  loop do 
    case next!
      when Escape
        grab
        param << next!
        grab
      when Space, LF, nil; break
    else
      param << next!
      grab
    end
  end

  param = nil if param.empty?
  param
end

#grab_func_param ⇒ Object 



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# File 'lib/formatline.rb', line 166

def grab_func_param
  grab # [
  param = ""
  loop do 
    case next!
      when Escape
        grab
        param << next!
        grab
      when "]", LF, nil; break
    else
      param << next!
      grab
    end
  end

  add curr
  grab
  param = nil if param.empty?
  param
end

#long_marker(char) ⇒ Object 



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# File 'lib/formatline.rb', line 290

def long_marker(char)
  sym = Syms[char]
  # grab  # skip left bracket
  kind = sym  # "param_#{sym}".to_sym
  arg = collect!(sym, Param, true)
  add_token kind, arg
end

#marker(char) ⇒ Object

def dollar_dot

add_token :ddot, @line[@i..-1]

end



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# File 'lib/formatline.rb', line 249

def marker(char)
  add_token :str
  sym = Syms[char]
  if embedded?
#     add char    # ??? add_token "*", :string
    return 
  end
  grab
  case curr
    when Space
      add char + " "
      add_token :str
      grab
    when LF, nil
      add char
      add_token :str
    when char;   double_marker(char)
    when LBrack; long_marker(char)
  else
    add curr
    str = collect!(sym, Blank)
    add_token sym, str
    add curr  # next char onto next token... 
  end
end

#next! ⇒ Object 



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# File 'lib/formatline.rb', line 138

def next!
  @line[@i+1]
end

#prev ⇒ Object 



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# File 'lib/formatline.rb', line 134

def prev
  @line[@i-1]
end

#showme(tag) ⇒ Object 



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# File 'lib/formatline.rb', line 337

def showme(tag)
  char = @line[@cc]
  puts "--- #{tag}: ch=#{@ch.inspect} next=#{@next.inspect} (cc=#@cc:#{char.inspect})   out=#{@out.inspect}"
end

#terminate?(terminators, ch) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/formatline.rb', line 23

def terminate?(terminators, ch)
  if terminators.is_a? Regexp
    terminators === ch
  else
    terminators.include?(ch)
  end
end

#tokenize(line) ⇒ Object 



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# File 'lib/formatline.rb', line 48

def tokenize(line)
  grab
  loop do 
    case curr
      when Escape; go; add curr; grab
      when "$"
        dollar
      when "*", "_", "`", "~"
        marker curr
        add curr
#         grab
      when LF
        break if @i >= line.size - 1
      when nil
        break
      else
        add curr
    end
    grab
  end
  add_token(:str)
  @tokenlist
end

#varsub(name) ⇒ Object 



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# File 'lib/formatline.rb', line 330

def varsub(name)
  result = Livetext::Vars[name]
  result
end