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30990006a9
This reduces chances of errors where consumers of strings mutate inputs and reduces memory usage of the app. Test suite passes now, but there may be some stuff left, so we will run a few sites on a branch prior to merging
67 lines
1.5 KiB
Ruby
67 lines
1.5 KiB
Ruby
# frozen_string_literal: true
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# this class is used to track changes to an arbitrary buffer
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class ContentBuffer
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def initialize(initial_content)
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@initial_content = initial_content
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@lines = @initial_content.split("\n")
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end
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def apply_transform!(transform)
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start_row = transform[:start][:row]
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start_col = transform[:start][:col]
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finish_row = transform[:finish][:row] if transform[:finish]
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finish_col = transform[:finish][:col] if transform[:finish]
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text = transform[:text]
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if transform[:operation] == :delete
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# fix first line
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l = @lines[start_row]
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l = l[0...start_col]
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if (finish_row == start_row)
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l << @lines[start_row][finish_col..-1]
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@lines[start_row] = l
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return
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end
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@lines[start_row] = l
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# remove middle lines
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(finish_row - start_row).times do
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l = @lines.delete_at start_row + 1
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end
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# fix last line
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@lines[start_row] << @lines[finish_row][finish_col - 1..-1]
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end
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if transform[:operation] == :insert
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@lines[start_row].insert(start_col, text)
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split = @lines[start_row].split("\n")
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if split.length > 1
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@lines[start_row] = split[0]
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i = 1
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split[1..-2].each do |line|
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@lines.insert(start_row + i, line)
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i += 1
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end
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@lines.insert(i, "") unless @lines.length > i
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@lines[i] = split[-1] + @lines[i]
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end
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end
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end
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def to_s
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@lines.join("\n")
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end
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end
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