class HamdownCore::IndentTracker

Public Class Methods

new(on_enter: nil, on_leave: nil) click to toggle source
# File lib/hamdown_core/indent_tracker.rb, line 32
def initialize(on_enter: nil, on_leave: nil)
  @indent_levels = [0]
  @on_enter = on_enter || lambda { |_level, _text| }
  @on_leave = on_leave || lambda { |_level, _text| }
  @comment_level = nil
end

Public Instance Methods

check_indent_level!(lineno) click to toggle source
# File lib/hamdown_core/indent_tracker.rb, line 69
def check_indent_level!(lineno)
  if @indent_levels.size >= 3
    previous_size = @indent_levels[-2] - @indent_levels[-3]
    current_size = @indent_levels[-1] - @indent_levels[-2]
    if previous_size != current_size
      raise InconsistentIndent.new(previous_size, current_size, lineno)
    end
  end
end
current_level() click to toggle source
# File lib/hamdown_core/indent_tracker.rb, line 61
def current_level
  @indent_levels.last
end
enter_comment!() click to toggle source
# File lib/hamdown_core/indent_tracker.rb, line 65
def enter_comment!
  @comment_level = @indent_levels[-2]
end
finish() click to toggle source
# File lib/hamdown_core/indent_tracker.rb, line 57
def finish
  indent_leave(0, '', -1)
end
process(line, lineno) click to toggle source
# File lib/hamdown_core/indent_tracker.rb, line 39
def process(line, lineno)
  if line.include?("\t")
    raise HardTabNotAllowed.new(lineno)
  end
  indent, text = split(line)
  indent_level = indent.size

  unless text.empty?
    track(indent_level, text, lineno)
  end
  [text, indent]
end
split(line) click to toggle source
# File lib/hamdown_core/indent_tracker.rb, line 52
def split(line)
  m = line.match(/\A( *)(.*)\z/)
  [m[1], m[2]]
end

Private Instance Methods

indent_enter(indent_level, text, _lineno) click to toggle source
# File lib/hamdown_core/indent_tracker.rb, line 89
def indent_enter(indent_level, text, _lineno)
  unless @comment_level
    @indent_levels.push(indent_level)
    @on_enter.call(indent_level, text)
  end
end
indent_leave(indent_level, text, lineno) click to toggle source
# File lib/hamdown_core/indent_tracker.rb, line 96
def indent_leave(indent_level, text, lineno)
  if @comment_level
    if indent_level <= @comment_level
      # finish comment mode
      @comment_level = nil
    else
      # still in comment
      return
    end
  end

  while indent_level < @indent_levels.last
    @indent_levels.pop
    @on_leave.call(indent_level, text)
  end

  if indent_level != @indent_levels.last
    raise IndentMismatch.new(indent_level, @indent_levels.dup, lineno)
  end
end
track(indent_level, text, lineno) click to toggle source
# File lib/hamdown_core/indent_tracker.rb, line 81
def track(indent_level, text, lineno)
  if indent_level > @indent_levels.last
    indent_enter(indent_level, text, lineno)
  elsif indent_level < @indent_levels.last
    indent_leave(indent_level, text, lineno)
  end
end