108 lines
2 KiB
Ruby
108 lines
2 KiB
Ruby
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# frozen_string_literal: true
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module IpynbDiff
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require 'oj'
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# Creates a map from a symbol to the line number it appears in a Json file
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#
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# Example:
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#
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# Input:
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#
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# 1. {
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# 2. 'obj1': [
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# 3. {
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# 4. 'obj2': 5
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# 5. },
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# 6. 3,
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# 7. {
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# 8. 'obj3': {
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# 9. 'obj4': 'b'
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# 10. }
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# 11. }
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# 12. ]
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# 13.}
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#
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# Output:
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#
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# Symbol Line Number
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# .obj1 -> 2
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# .obj1.0 -> 3
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# .obj1.0 -> 3
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# .obj1.0.obj2 -> 4
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# .obj1.1 -> 6
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# .obj1.2 -> 7
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# .obj1.2.obj3 -> 8
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# .obj1.2.obj3.obj4 -> 9
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#
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class SymbolMap
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class << self
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def handler
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@handler ||= SymbolMap.new
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end
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def parser
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@parser ||= Oj::Parser.new(:saj).tap { |p| p.handler = handler }
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end
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def parse(notebook, *args)
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handler.reset
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parser.parse(notebook)
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handler.symbols
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end
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end
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attr_accessor :symbols
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def hash_start(key, line, column)
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add_symbol(key_or_index(key), line)
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end
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def hash_end(key, line, column)
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@current_path.pop
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end
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def array_start(key, line, column)
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@current_array_index << 0
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add_symbol(key, line)
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end
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def array_end(key, line, column)
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@current_path.pop
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@current_array_index.pop
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end
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def add_value(value, key, line, column)
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add_symbol(key_or_index(key), line)
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@current_path.pop
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end
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def add_symbol(symbol, line)
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@symbols[@current_path.append(symbol).join('.')] = line if symbol
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end
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def key_or_index(key)
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if key.nil? # value in an array
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if @current_path.empty?
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@current_path = ['']
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return nil
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end
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symbol = @current_array_index.last
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@current_array_index[-1] += 1
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symbol
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else
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key
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end
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end
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def reset
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@current_path = []
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@symbols = {}
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@current_array_index = []
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end
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end
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end
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