Class: ContentBuffer
- Inherits:
-
Object
- Object
- ContentBuffer
- Defined in:
- lib/content_buffer.rb
Overview
this class is used to track changes to an arbitrary buffer
Instance Method Summary collapse
- #apply_transform!(transform) ⇒ Object
-
#initialize(initial_content) ⇒ ContentBuffer
constructor
A new instance of ContentBuffer.
- #to_s ⇒ Object
Constructor Details
#initialize(initial_content) ⇒ ContentBuffer
Returns a new instance of ContentBuffer.
6 7 8 9 |
# File 'lib/content_buffer.rb', line 6 def initialize(initial_content) @initial_content = initial_content @lines = @initial_content.split("\n") end |
Instance Method Details
#apply_transform!(transform) ⇒ Object
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 |
# File 'lib/content_buffer.rb', line 11 def apply_transform!(transform) start_row = transform[:start][:row] start_col = transform[:start][:col] finish_row = transform[:finish][:row] if transform[:finish] finish_col = transform[:finish][:col] if transform[:finish] text = transform[:text] if transform[:operation] == :delete # fix first line l = @lines[start_row] l = l[0...start_col] if (finish_row == start_row) l << @lines[start_row][finish_col..-1] @lines[start_row] = l return end @lines[start_row] = l # remove middle lines (finish_row - start_row).times { l = @lines.delete_at start_row + 1 } # fix last line @lines[start_row] << @lines[finish_row][finish_col - 1..-1] end if transform[:operation] == :insert @lines[start_row].insert(start_col, text) split = @lines[start_row].split("\n") if split.length > 1 @lines[start_row] = split[0] i = 1 split[1..-2].each do |line| @lines.insert(start_row + i, line) i += 1 end @lines.insert(i, "") if @lines.length <= i @lines[i] = split[-1] + @lines[i] end end end |
#to_s ⇒ Object
57 58 59 |
# File 'lib/content_buffer.rb', line 57 def to_s @lines.join("\n") end |