Class: IpynbDiff::IpynbSymbolMap

Inherits:
Object
  • Object
show all
Defined in:
lib/ipynb_symbol_map.rb

Overview

Creates a symbol map for a ipynb file (JSON format)

Constant Summary collapse

WHITESPACE_CHARS = 
["\t", "\r", ' ', "\n"].freeze
VALUE_STOPPERS = 
[',', '[', ']', '{', '}', *WHITESPACE_CHARS].freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(notebook) ⇒ IpynbSymbolMap

Returns a new instance of IpynbSymbolMap.



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# File 'lib/ipynb_symbol_map.rb', line 21

def initialize(notebook)
  @chars = notebook.chars
  @current_line = 0
  @char_idx = 0
  @results = {}
end

Instance Attribute Details

#char_idx ⇒ Object (readonly)

Returns the value of attribute char_idx.



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# File 'lib/ipynb_symbol_map.rb', line 15

def char_idx
  @char_idx
end

#current_line ⇒ Object (readonly)

Returns the value of attribute current_line.



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# File 'lib/ipynb_symbol_map.rb', line 15

def current_line
  @current_line
end

#results ⇒ Object (readonly)

Returns the value of attribute results.



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# File 'lib/ipynb_symbol_map.rb', line 15

def results
  @results
end

Class Method Details

.parse(notebook) ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 10

def parse(notebook)
  IpynbSymbolMap.new(notebook).parse('')
end

Instance Method Details

#add_result(key, line_number) ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 104

def add_result(key, line_number)
  @results[key] = line_number
end

#check_for_new_line ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 136

def check_for_new_line
  @current_line += 1 if current_char == "\n"
end

#current_char ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 128

def current_char
  @chars[@char_idx]
end

#current_should_be(another_char) ⇒ Object

Raises:



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# File 'lib/ipynb_symbol_map.rb', line 132

def current_should_be(another_char)
  raise InvalidTokenError unless current_char == another_char
end

#increment_char_index ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 119

def increment_char_index
  @char_idx += 1
end

#next_and_skip_whitespaces ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 123

def next_and_skip_whitespaces
  increment_char_index
  skip_whitespaces
end

#parse(prefix = '.') ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 28

def parse(prefix = '.')
  skip_whitespaces

  if (c = current_char) == '"'
    parse_string
  elsif c == '['
    parse_array(prefix)
  elsif c == '{'
    parse_object(prefix)
  else
    parse_value
  end

  results
end

#parse_array(prefix) ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 44

def parse_array(prefix)
  # [1, 2, {"some": "object"}, [1]]

  i = 0

  current_should_be '['

  loop do
    break if skip_beginning(']')

    new_prefix = "#{prefix}.#{i}"

    add_result(new_prefix, current_line)

    parse(new_prefix)

    i += 1
  end
end

#parse_object(prefix) ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 64

def parse_object(prefix)
  # {"name":"value", "another_name": [1, 2, 3]}

  current_should_be '{'

  loop do
    break if skip_beginning('}')

    prop_name = parse_string

    new_prefix = "#{prefix}.#{prop_name}"

    add_result(new_prefix, current_line)

    next_and_skip_whitespaces

    current_should_be ':'

    next_and_skip_whitespaces

    parse(new_prefix)
  end
end

#parse_string ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 88

def parse_string
  value = ''
  prev_char = nil

  current_should_be '"'

  loop do
    increment_char_index
    break if (c = current_char) == '"' && prev_char != '\\'

    value += (prev_char = c)
  end

  value
end

#parse_value ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 108

def parse_value
  increment_char_index until VALUE_STOPPERS.include?(current_char)
end

#skip_beginning(closing_char) ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 140

def skip_beginning(closing_char)

  check_for_new_line

  next_and_skip_whitespaces

  return true if current_char == closing_char

  next_and_skip_whitespaces if current_char == ','
end

#skip_whitespaces ⇒ Object 



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# File 'lib/ipynb_symbol_map.rb', line 112

def skip_whitespaces
  while WHITESPACE_CHARS.include?(current_char)
    check_for_new_line
    increment_char_index
  end
end