Class: JMESPath::Nodes::Slice Private

Inherits:
Node
  • Object
show all
Defined in:
lib/jmespath/nodes/slice.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

API:

  • private

Direct Known Subclasses

SimpleSlice

Instance Method Summary collapse

Methods inherited from Node

#chains_with?

Constructor Details

#initialize(start, stop, step) ⇒ Slice

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Slice.

Raises:

API:

  • private



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# File 'lib/jmespath/nodes/slice.rb', line 6

def initialize(start, stop, step)
  @start = start
  @stop = stop
  @step = step
  raise Errors::InvalidValueError, 'slice step cannot be 0' if @step == 0
end

Instance Method Details

#optimize ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

API:

  • private



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# File 'lib/jmespath/nodes/slice.rb', line 34

def optimize
  if (@step.nil? || @step == 1) && @start && @stop && @start > 0 && @stop > @start
    SimpleSlice.new(@start, @stop)
  else
    self
  end
end

#visit(value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

API:

  • private



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# File 'lib/jmespath/nodes/slice.rb', line 13

def visit(value)
  if (value = value.respond_to?(:to_str) ? value.to_str : value.respond_to?(:to_ary) ? value.to_ary : nil)
    start, stop, step = adjust_slice(value.size, @start, @stop, @step)
    result = []
    if step > 0
      i = start
      while i < stop
        result << value[i]
        i += step
      end
    else
      i = start
      while i > stop
        result << value[i]
        i += step
      end
    end
    value.respond_to?(:to_str) ? result.join : result
  end
end