Class: RText::Frontend::Context

Inherits:
Object
  • Object
show all
Defined in:
lib/rtext/frontend/context.rb

Instance Method Summary collapse

Instance Method Details

#extract(lines, pos) ⇒ Object

lines: all lines from the beginning up to and including the current line pos: position of the cursor in the last lines returns the extracted lines and the new position in the last line



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# File 'lib/rtext/frontend/context.rb', line 9

def extract(lines, pos)
  lines = filter_lines(lines)
  lines, new_pos = join_lines(lines, pos)
  non_ignored_lines = 0
  array_nesting = 0
  block_nesting = 0
  last_element_line = 0
  result = []
  lines.reverse.each_with_index do |l, i|
    if i == 0
      result.unshift(l)
    else
      non_ignored_lines += 1
      case l.strip[-1..-1]
      when "{"
        if block_nesting > 0
          block_nesting -= 1 
        elsif block_nesting == 0
          result.unshift(l)
          last_element_line = non_ignored_lines
        end
      when "}"
        block_nesting += 1
      when "["
        if array_nesting > 0
          array_nesting -= 1
        elsif array_nesting == 0
          result.unshift(l)
        end
      when "]"
        array_nesting += 1
      when ":"
        # lable directly above element

        if non_ignored_lines == last_element_line + 1
          result.unshift(l)
        end
      end
    end
  end
  [result, new_pos]
end

#filter_lines(lines) ⇒ Object 



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# File 'lib/rtext/frontend/context.rb', line 51

def filter_lines(lines)
  lines.reject { |l| 
    ls = l.strip
    ls[0..0] == "@" || ls[0..0] == "#"
  }
end

#join_lines(lines, pos) ⇒ Object

when joining two lines, all whitespace is preserved in order to simplify the algorithm whitespace after a backslash is also preserved, only the backslash itself is removed note that whitespace left of the cursor is important for proper context calculation



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# File 'lib/rtext/frontend/context.rb', line 61

def join_lines(lines, pos)
  outlines = []
  while lines.size > 0
    outlines << lines.shift
    while lines.size > 0 && 
        (outlines.last =~ /[,\\]\s*$/ || 
          # don't join after a child label

          (outlines.last !~ /^\s*\w+:/ &&
            (outlines.last =~ /\[\s*$/ ||
            (lines.first =~ /^\s*\]/ && outlines.last =~ /\[/))))
      l = lines.shift
      outlines.last.gsub!("\\","")
      if lines.size == 0
        # the prefix might have whitespace on the

        # right hand side which is relevant for the position

        pos = outlines.last.size + pos
      end
      outlines.last.concat(l)
    end
  end
  [outlines, pos]
end