Class: CompactCSV::Row

Inherits:
CSV::Row
  • Object
show all
Defined in:
lib/compact_csv.rb

Instance Method Summary collapse

Constructor Details

#initialize(headers, fields, header_row = false) ⇒ Row

Returns a new instance of Row.



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# File 'lib/compact_csv.rb', line 13

def initialize(headers, fields, header_row = false)
  headers.freeze
  @headers = headers
  @row_values = fields
end

Instance Method Details

#<<(arg) ⇒ Object

not compatible methods

Raises:



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# File 'lib/compact_csv.rb', line 117

def <<(arg)
  raise CompatibilityError.new("CompactCSV does not allow to append fields into row. Please use CSV module.")
end

#==(other) ⇒ Object 



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# File 'lib/compact_csv.rb', line 111

def ==(other)
  return row == other.row if other.is_a? CompactCSV::Row
  row == other
end

#[](index) ⇒ Object Also known as: field 



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# File 'lib/compact_csv.rb', line 84

def [](index)
  if index.is_a?(Integer)
    @row_values[index]
  else
    i = headers.find_index(index)
    i ? @row_values[i] : nil
  end
end

#[]=(index, value) ⇒ Object 



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# File 'lib/compact_csv.rb', line 94

def []=(index, value)
  if index.is_a?(Integer)
    @row_values[index] = value
  else
    i = headers.find_index(index)
    @row_values[i] = value if i
  end
end

#delete(header_or_index, minimum_index = 0) ⇒ Object

Raises:



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# File 'lib/compact_csv.rb', line 125

def delete(header_or_index, minimum_index = 0)
  raise CompatibilityError.new("CompactCSV does not allow to delete fields from row. Please use CSV module.")
end

#delete_if(&block) ⇒ Object

Raises:



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# File 'lib/compact_csv.rb', line 129

def delete_if(&block)
  raise CompatibilityError.new("CompactCSV does not allow to delete fields from row. Please use CSV module.")
end

#each(&block) ⇒ Object 



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# File 'lib/compact_csv.rb', line 35

def each(&block)
  row.each(&block)
  self
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/compact_csv.rb', line 60

def empty?
  @row_values.empty?
end

#fetch(header, *varargs) ⇒ Object

Raises:

  • (ArgumentError) 


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

def fetch(header, *varargs)
  raise ArgumentError, "Too many arguments" if varargs.length > 1
  pair = row.assoc(header)
  if pair
    pair.last
  else
    if block_given?
      yield header
    elsif varargs.empty?
      raise KeyError, "key not found: #{header}"
    else
      varargs.first
    end
  end
end

#fields(*headers_and_or_indices) ⇒ Object 



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# File 'lib/compact_csv.rb', line 40

def fields(*headers_and_or_indices)
  if headers_and_or_indices.empty?
    size_diff = @headers.size - @row_values.size
    if size_diff <= 0
      @row_values
    elsif size_diff > 0
      @row_values + Array.new(size_diff, nil)
    end
  else
    headers_and_or_indices.map do |index|
      field(index)
    end
  end
end

#has_key?(header) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/compact_csv.rb', line 80

def has_key?(header)
  !!row.assoc(header)
end

#header_row? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/compact_csv.rb', line 31

def header_row?
  false
end

#headers ⇒ Object 



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# File 'lib/compact_csv.rb', line 19

def headers
  @headers
end

#push(*args) ⇒ Object

Raises:



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# File 'lib/compact_csv.rb', line 121

def push(*args)
  raise CompatibilityError.new("CompactCSV does not allow to append fields into row. Please use CSV module.")
end

#row ⇒ Object 



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# File 'lib/compact_csv.rb', line 23

def row
  if @headers.size >= @row_values.size
    @headers.zip(@row_values).to_a
  else
    @row_values.zip(@headers).map { |pair| pair.reverse! }
  end
end

#size ⇒ Object Also known as: length 



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# File 'lib/compact_csv.rb', line 55

def size
  [ @row_values.size, @headers.size ].max
end

#to_hash ⇒ Object 



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# File 'lib/compact_csv.rb', line 103

def to_hash
  hash = {}
  @row_values.zip(headers) do |value, row|
    hash[row] = value
  end
  hash
end