Module: Expando::Expander

Defined in:
lib/expando/expander.rb

Constant Summary collapse

TOKEN_REGEX = 
/(?<!\\)\((.*?)\)/

Class Method Summary collapse

Class Method Details

.expand!(lines) ⇒ Array

Generate a new Expander.

Parameters:

  • lines (Array<String>) —

    The text to scan and expand.

Returns:

  • (Array) —

    The expanded text.



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# File 'lib/expando/expander.rb', line 24

def expand!( lines )
  expanded_lines = []

  lines.each do |line|
    tokens = line.scan TOKEN_REGEX

    # Don't perform expansion if no tokens are present.
    if tokens.empty?
      expanded_lines << line
      next
    end

    expanded_tokens = []
    tokens.each_with_index do |token, index|
      expanded_tokens[index] = token[0].split( '|' )
    end

    # Produce Cartesian product of all tokenized values.
    token_product = expanded_tokens[ 0 ].product( *expanded_tokens[ 1..-1 ] )

    # Generate new expanded lines.
    token_product.each do |replacement_values|
      expanded_line = line

      replacement_values.each do |value|
        expanded_line = expanded_line.sub( TOKEN_REGEX, value )
      end

      # TODO: Replace multiple spaces with a single space
      expanded_lines << expanded_line.strip
    end
  end

  expanded_lines
end