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51 lines
944 B
Ruby
51 lines
944 B
Ruby
class Grid
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attr_reader :width, :height, :lines
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def initialize(lines)
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@lines = lines
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@width = lines.first && lines.first.sum(&:size) || 0
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@height = lines.size
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end
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def crop(x, y, width, height)
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cropped_lines = lines[y...y+height].map { |line| crop_line(line, x, width) }
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self.class.new(cropped_lines)
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end
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def diff(other)
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(0...height).each_with_object({}) do |y, diff|
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if other.nil? || other.lines[y] != lines[y]
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diff[y] = lines[y]
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end
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end
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end
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def as_json(*)
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lines.as_json
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end
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private
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def crop_line(line, x, width)
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n = 0
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cells = []
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line.each do |cell|
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if n <= x && x < n + cell.size
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cells << cell[x-n...x-n+width]
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elsif x < n && x + width >= n + cell.size
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cells << cell
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elsif n < x + width && x + width < n + cell.size
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cells << cell[0...x+width-n]
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end
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n += cell.size
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end
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cells
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end
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end
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