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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:
#
# * <b>%p</b> -- The complete path.
# * <b>%f</b> -- The base file name of the path, with its file extension,
# but without any directories.
# * <b>%n</b> -- The file name of the path without its file extension.
# * <b>%d</b> -- The directory list of the path.
# * <b>%x</b> -- The file extension of the path. An empty string if there
# is no extension.
# * <b>%X</b> -- Everything *but* the file extension.
# * <b>%s</b> -- The alternate file separator if defined, otherwise use
# the standard file separator.
# * <b>%%</b> -- 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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