class Asciidoctor::Table::ParserContext

finally, a new buffer is allocated to track the next cell.
instantiated, the row is closed if the cell satisifies the column count and,
is located, the previous cell is closed, an instance of Table::Cell is
moves through the lines of the table using tail recursion. When a cell boundary
class are primarily responsible for tracking the buffer of a cell as the parser
Public: Methods for managing the parsing of an AsciiDoc table. Instances of this

def activate_rowspan(rowspan, colspan)

returns nothing

determining the effective number of cells in the current row.
Public: Activate a rowspan. The rowspan Array is consulted when 
def activate_rowspan(rowspan, colspan)
  1.upto(rowspan - 1).each {|i|
    @active_rowspans[i] ||= 0
    @active_rowspans[i] += colspan 
  }
  nil
end

def buffer_has_unclosed_quotes?(append = nil)

isn't quoted data
returns true if the buffer has unclosed quotes, false if it doesn't or it

Public: Determines whether the buffer has unclosed quotes. Used for CSV data. 
def buffer_has_unclosed_quotes?(append = nil)
  record = "#@buffer#{append}".strip
  record.start_with?('"') && !record.start_with?('""') && !record.end_with?('"')
end

def buffer_quoted?

false otherwise
returns true if the buffer starts with a double quote (and not an escaped double quote),

Public: Determines whether the buffer contains quoted data. Used for CSV data. 
def buffer_quoted?
  @buffer.lstrip!
  @buffer.start_with?('"') && !@buffer.start_with?('""')
end

def cell_closed?

returns true if the cell is marked as closed, false otherwise

Public: Checks whether the current cell has been marked as closed 
def cell_closed?
  !@cell_open
end

def cell_open?

returns true if the cell is marked as open, false otherwise

Public: Checks whether the current cell is still open 
def cell_open?
  @cell_open
end

def close_cell(eol = false)

returns nothing

row has been met, close the row and begin a new one.
the current row and, if the number of expected columns for the current
Public: Close the current cell, instantiate a new Table::Cell, add it to 
def close_cell(eol = false)
  cell_text = @buffer.strip
  @buffer = ''
  if format == 'psv'
    cell_spec = take_cell_spec
    repeat = cell_spec.fetch('repeatcol', 1)
    cell_spec.delete('repeatcol')
  else
    cell_spec = nil
    repeat = 1
    if format == 'csv'
      if !cell_text.empty? && cell_text.include?('"')
        # this may not be perfect logic, but it hits the 99%
        if cell_text.start_with?('"') && cell_text.end_with?('"')
          # unquote
          cell_text = cell_text[1..-2].strip
        end
        
        # collapses escaped quotes
        cell_text = cell_text.tr_s('"', '"')
      end
    end
  end
  1.upto(repeat) {|i|
    # make column resolving an operation
    if @col_count == -1
      @table.columns << Table::Column.new(@table, @current_row.size + i - 1)
      column = @table.columns.last 
    else
      # QUESTION is this right for cells that span columns?
      column = @table.columns[@current_row.size]
    end
    cell = Table::Cell.new(column, cell_text, cell_spec)
    unless cell.rowspan.nil? || cell.rowspan == 1
      activate_rowspan(cell.rowspan, (cell.colspan || 1))
    end
    @col_visits += (cell.colspan || 1)
    @current_row << cell
    # don't close the row if we're on the first line and the column count has not been set explicitly
    # TODO perhaps the col_count/linenum logic should be in end_of_row? (or a should_end_row? method)
    close_row if end_of_row? && (@col_count != -1 || @linenum > 0 || (eol && i == repeat))
  }
  @open_cell = false
  nil
end

def close_open_cell(next_cell_spec = {})

returns nothing

by the next cell.
cell spec captured from the end of this cell onto the stack for use
Public: If the current cell is open, close it. In additional, push the 
def close_open_cell(next_cell_spec = {})
  push_cell_spec next_cell_spec
  close_cell(true) if cell_open?
  next_line
  nil
end

def close_row

returns nothing

Array and counter variables.
Public: Close the row by adding it to the Table and resetting the row 
def close_row
  @table.rows.body << @current_row
  # don't have to account for active rowspans here
  # since we know this is first row
  @col_count = @col_visits if @col_count == -1
  @col_visits = 0
  @current_row = []
  @active_rowspans.shift
  @active_rowspans[0] ||= 0
  nil
end

def effective_col_visits

cells plus any active rowspans.
Public: Calculate the effective column visits, which consists of the number of 
def effective_col_visits
  @col_visits + @active_rowspans.first
end

def end_of_row?

Public: Check whether we've met the number of effective columns for the current row. 
def end_of_row?
  @col_count == -1 || effective_col_visits == @col_count
end

def initialize(table, attributes = {}) 

def initialize(table, attributes = {})
  @table = table
  if attributes.has_key? 'format'
    @format = attributes['format']
    if !Table::DATA_FORMATS.include? @format
      raise "Illegal table format: #@format"
    end
  else
    @format = Table::DEFAULT_DATA_FORMAT
  end
  if @format == 'psv' && !attributes.has_key?('separator') && table.document.nested?
    @delimiter = '!'
  else
    @delimiter = attributes.fetch('separator', Table::DEFAULT_DELIMITERS[@format])
  end
  @delimiter_re = /#{Regexp.escape @delimiter}/
  @col_count = table.columns.empty? ? -1 : table.columns.size
  @buffer = ''
  @cell_specs = []
  @cell_open = false
  @active_rowspans = [0]
  @col_visits = 0
  @current_row = []
  @linenum = -1
end

def keep_cell_open

returns nothing

reached and the cell may contain additional text.
Public: Marks that the cell should be kept open. Used when the end of the line is 
def keep_cell_open
  @cell_open = true
  nil
end

def mark_cell_closed

returns nothing

instance and add it to the current row.
Public: Marks the cell as closed so that the parser knows to instantiate a new cell 
def mark_cell_closed
  @cell_open = false
  nil
end

def match_delimiter(line)

returns MatchData if the line contains the delimiter, false otherwise

used by this table.
Public: Checks whether the line provided contains the cell delimiter 
def match_delimiter(line)
  line.match @delimiter_re
end

def next_line

the next line if the last cell had wrapped content).
Internal: Advance to the next line (which may come after the parser begins processing 
def next_line
  @linenum += 1
end

def push_cell_spec(cell_spec = {})

returns nothing

stack is used to carry over the spec to the next cell.
Public: Puts a cell spec onto the stack. Cell specs precede the delimiter, so a 
def push_cell_spec(cell_spec = {})
  # this shouldn't be nil, but we check anyway
  @cell_specs << (cell_spec || {})
  nil
end

def skip_matched_delimiter(match, escaped = false)

returns the String after the match

(either because it was escaped or in a quoted context)
Public: Skip beyond the matched delimiter because it was a false positive 
def skip_matched_delimiter(match, escaped = false)
  @buffer << (escaped ? match.pre_match.chop : match.pre_match) << @delimiter
  match.post_match
end

def starts_with_delimiter?(line)

returns true if the line starts with the delimiter, false otherwise

used by this table.
Public: Checks whether the line provided starts with the cell delimiter 
def starts_with_delimiter?(line)
  line.start_with? @delimiter
end

def take_cell_spec()

returns The cell spec Hash captured from parsing the previous cell

when the cell is being closed.
stack is used to carry over the spec from the previous cell to the current cell
Public: Takes a cell spec from the stack. Cell specs precede the delimiter, so a 
def take_cell_spec()
  @cell_specs.shift
end