Class: String

Inherits:
Object show all
Defined in:
lib/utility_belt/pipe.rb,
lib/utility_belt/language_greps.rb,
lib/utility_belt/string_to_proc.rb

Overview

String#to_proc

See weblog.raganwald.com/2007/10/stringtoproc.html

Ported from the String Lambdas in Oliver Steele’s Functional Javascript osteele.com/sources/javascript/functional/

This work is licensed under the MIT License:

© 2007 Reginald Braithwaite Portions Copyright © 2006 Oliver Steele

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Instance Method Summary collapse

Instance Method Details

#blank? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/utility_belt/language_greps.rb', line 4

def blank?
  self !~ /\S/
end

#to_proc(&block) ⇒ Object 



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# File 'lib/utility_belt/string_to_proc.rb', line 34

def to_proc &block
  params = []
  expr = self
  sections = expr.split(/\s*->\s*/m)
  if sections.length > 1 then
      eval_block(sections.reverse!.inject { |e, p| "(Proc.new { |#{p.split(/\s/).join(', ')}| #{e} })" }, block)
  elsif expr.match(/\b_\b/)
      eval_block("Proc.new { |_| #{expr} }", block)
  else
      leftSection = expr.match(/^\s*(?:[+*\/%&|\^\.=<>\[]|!=)/m)
      rightSection = expr.match(/[+\-*\/%&|\^\.=<>!]\s*$/m)
      if leftSection || rightSection then
          if (leftSection) then
              params.push('$left')
              expr = '$left' + expr
          end
          if (rightSection) then
              params.push('$right')
              expr = expr + '$right'
          end
      else
          self.gsub(
              /(?:\b[A-Z]|\.[a-zA-Z_$])[a-zA-Z_$\d]*|[a-zA-Z_$][a-zA-Z_$\d]*:|self|arguments|'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"/, ''
          ).scan(
            /([a-z_$][a-z_$\d]*)/i
          ) do |v|  
            params.push(v) unless params.include?(v)
          end
      end
      eval_block("Proc.new { |#{params.join(', ')}| #{expr} }", block)
  end
end

#|(cmd) ⇒ Object 



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# File 'lib/utility_belt/pipe.rb', line 17

def |(cmd)
  IO.popen(cmd, 'r+') do |pipe|
    pipe.write(self)
    pipe.close_write
    pipe.read
  end
end