Module: Peruby::Lexer::Number

Defined in:
lib/peruby/lexer/number.rb

Overview

Converts a Perl numeric literal to a Ruby value.

Constant Summary collapse

PATTERN = 
/\A(?:
  v\d+(?:\.\d+)+ | 0[xX][0-9a-fA-F_]+ | 0[bB][01_]+ | 0[oO][0-7_]+ | 0[0-7_]+ |
  (?:\d[\d_]*\.?[\d_]*|\.[\d_]+)(?:[eE][+-]?[\d_]+)?
)/x

Class Method Summary collapse

Class Method Details

.convert(literal) ⇒ Object 



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# File 'lib/peruby/lexer/number.rb', line 20

def convert(literal)
  clean = literal.delete('_')
  return clean.delete_prefix('v').split('.').map(&:to_i) if clean.start_with?('v')
  return clean.to_i(16) if clean.match?(/\A0x/i)
  return clean.to_i(2) if clean.match?(/\A0b/i)
  return clean.to_i(8) if clean.match?(/\A0o/i) || clean.match?(/\A0[0-7]+\z/)
  return clean.to_f if clean.match?(/[.e]/i)

  clean.to_i
end

.scan(source) ⇒ Object 



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# File 'lib/peruby/lexer/number.rb', line 14

def scan(source)
  literal = PATTERN.match(source)&.[](0)
  literal = literal.chop if literal&.end_with?('.') && source[literal.length] == '.'
  [literal, convert(literal)] if literal
end