class String
User defined methods to be added to String
.
Public Instance Methods
Replace the file extension with newext
. If there is no extenson 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.
# File lib/sproutcore/buildfile/string_ext.rb, line 40 def ext(newext='') return self.dup if ['.', '..'].include? self newext = newext.to_s if newext != '' newext = (newext =~ /^\./) ? newext : ("." + newext) end dup.sub!(%r(([^/\\])\.[^./\\]*$)) { $1 + newext } || self + newext end
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 separater 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 substititions on a particular part of the path. The pattern and replacement are speparated 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”). Muliple 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"
# File lib/sproutcore/buildfile/string_ext.rb, line 157 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 << $1 if self =~ /[^\/](\.[^.]+)$/ when '%X' if self =~ /^(.*[^\/])(\.[^.]+)$/ result << $1 else result << self end 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
Explode a path into individual components. Used by pathmap
.
# File lib/sproutcore/buildfile/string_ext.rb, line 52 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
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.
# File lib/sproutcore/buildfile/string_ext.rb, line 64 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
Preform the pathmap replacement operations on the given path. The patterns take the form 'pat1,rep1;pat2,rep2…'.
# File lib/sproutcore/buildfile/string_ext.rb, line 80 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
# File lib/sproutcore.rb, line 17 def valid_encoding? ; true ; end