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✏️ Editing: string.rb

require 'rake/ext/core'

######################################################################
# Rake extension methods for String.
#
class String
 rake_extension("ext") do
 # Replace the file extension with +newext+. If there is no extension on
 # the string, append the new extension to the end. If the new extension
 # is not given, or is the empty string, remove any existing extension.
 #
 # +ext+ is a user added method for the String class.
 def ext(newext='')
 return self.dup if ['.', '..'].include? self
 if newext != ''
 newext = (newext =~ /^\./) ? newext : ("." + newext)
 end
 self.chomp(File.extname(self)) << newext
 end
 end

rake_extension("pathmap") do
    # Explode a path into individual components.  Used by +pathmap+.
    def pathmap_explode
      head, tail = File.split(self)
      return [self] if head == self
      return [tail] if head == '.' || tail == '/'
      return [head, tail] if head == '/'
      return head.pathmap_explode + [tail]
    end
    protected :pathmap_explode

# Extract a partial path from the path. Include +n+ directories from the
 # front end (left hand side) if +n+ is positive. Include |+n+|
 # directories from the back end (right hand side) if +n+ is negative.
 def pathmap_partial(n)
 dirs = File.dirname(self).pathmap_explode
 partial_dirs =
 if n > 0
 dirs[0...n]
 elsif n < 0
 dirs.reverse[0...-n].reverse
 else
 "."
 end
 File.join(partial_dirs)
 end
 protected :pathmap_partial

# Preform the pathmap replacement operations on the given path. The
    # patterns take the form 'pat1,rep1;pat2,rep2...'.
    def pathmap_replace(patterns, &block)
      result = self
      patterns.split(';').each do |pair|
        pattern, replacement = pair.split(',')
        pattern = Regexp.new(pattern)
        if replacement == '*' && block_given?
          result = result.sub(pattern, &block)
        elsif replacement
          result = result.sub(pattern, replacement)
        else
          result = result.sub(pattern, '')
        end
      end
      result
    end
    protected :pathmap_replace

# Map the path according to the given specification. The specification
 # controls the details of the mapping. The following special patterns are
 # recognized:
 #
 # * %p -- The complete path.
 # * %f -- The base file name of the path, with its file extension,
 # but without any directories.
 # * %n -- The file name of the path without its file extension.
 # * %d -- The directory list of the path.
 # * %x -- The file extension of the path. An empty string if there
 # is no extension.
 # * %X -- Everything *but* the file extension.
 # * %s -- The alternate file separator if defined, otherwise use
 # the standard file separator.
 # * %% -- A percent sign.
 #
 # The %d specifier can also have a numeric prefix (e.g. '%2d'). If the
 # number is positive, only return (up to) +n+ directories in the path,
 # starting from the left hand side. If +n+ is negative, return (up to)
 # |+n+| directories from the right hand side of the path.
 #
 # Examples:
 #
 # 'a/b/c/d/file.txt'.pathmap("%2d") => 'a/b'
 # 'a/b/c/d/file.txt'.pathmap("%-2d") => 'c/d'
 #
 # Also the %d, %p, %f, %n, %x, and %X operators can take a
 # pattern/replacement argument to perform simple string substitutions on a
 # particular part of the path. The pattern and replacement are separated
 # by a comma and are enclosed by curly braces. The replacement spec comes
 # after the % character but before the operator letter. (e.g.
 # "%{old,new}d"). Multiple replacement specs should be separated by
 # semi-colons (e.g. "%{old,new;src,bin}d").
 #
 # Regular expressions may be used for the pattern, and back refs may be
 # used in the replacement text. Curly braces, commas and semi-colons are
 # excluded from both the pattern and replacement text (let's keep parsing
 # reasonable).
 #
 # For example:
 #
 # "src/org/onestepback/proj/A.java".pathmap("%{^src,bin}X.class")
 #
 # returns:
 #
 # "bin/org/onestepback/proj/A.class"
 #
 # If the replacement text is '*', then a block may be provided to perform
 # some arbitrary calculation for the replacement.
 #
 # For example:
 #
 # "/path/to/file.TXT".pathmap("%X%{.*,*}x") { |ext|
 # ext.downcase
 # }
 #
 # Returns:
 #
 # "/path/to/file.txt"
 #
 def pathmap(spec=nil, &block)
 return self if spec.nil?
 result = ''
 spec.scan(/%\{[^}]*\}-?\d*[sdpfnxX%]|%-?\d+d|%.|[^%]+/) do |frag|
 case frag
 when '%f'
 result << File.basename(self)
 when '%n'
 result << File.basename(self).ext
 when '%d'
 result << File.dirname(self)
 when '%x'
 result << File.extname(self)
 when '%X'
 result << self.ext
 when '%p'
 result << self
 when '%s'
 result << (File::ALT_SEPARATOR || File::SEPARATOR)
 when '%-'
 # do nothing
 when '%%'
 result << "%"
 when /%(-?\d+)d/
 result << pathmap_partial($1.to_i)
 when /^%\{([^}]*)\}(\d*[dpfnxX])/
 patterns, operator = $1, $2
 result << pathmap('%' + operator).pathmap_replace(patterns, &block)
 when /^%/
 fail ArgumentError, "Unknown pathmap specifier #{frag} in '#{spec}'"
 else
 result << frag
 end
 end
 result
 end
 end
end # class String

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