Class | String |
In: |
lib/rake.rb
|
Parent: | Object |
User defined methods to be added to String.
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/rake.rb, line 80 80: def ext(newext='') 81: return self.dup if ['.', '..'].include? self 82: if newext != '' 83: newext = (newext =~ /^\./) ? newext : ("." + newext) 84: end 85: dup.sub!(%r(([^/\\])\.[^./\\]*$)) { $1 + newext } || self + newext 86: end
Map the path according to the given specification. The specification controls the details of the mapping. The following special patterns are recognized:
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/rake.rb, line 196 196: def pathmap(spec=nil, &block) 197: return self if spec.nil? 198: result = '' 199: spec.scan(/%\{[^}]*\}-?\d*[sdpfnxX%]|%-?\d+d|%.|[^%]+/) do |frag| 200: case frag 201: when '%f' 202: result << File.basename(self) 203: when '%n' 204: result << File.basename(self).ext 205: when '%d' 206: result << File.dirname(self) 207: when '%x' 208: result << $1 if self =~ /[^\/](\.[^.]+)$/ 209: when '%X' 210: if self =~ /^(.*[^\/])(\.[^.]+)$/ 211: result << $1 212: else 213: result << self 214: end 215: when '%p' 216: result << self 217: when '%s' 218: result << (File::ALT_SEPARATOR || File::SEPARATOR) 219: when '%-' 220: # do nothing 221: when '%%' 222: result << "%" 223: when /%(-?\d+)d/ 224: result << pathmap_partial($1.to_i) 225: when /^%\{([^}]*)\}(\d*[dpfnxX])/ 226: patterns, operator = $1, $2 227: result << pathmap('%' + operator).pathmap_replace(patterns, &block) 228: when /^%/ 229: fail ArgumentError, "Unknown pathmap specifier #{frag} in '#{spec}'" 230: else 231: result << frag 232: end 233: end 234: result 235: end
Explode a path into individual components. Used by pathmap.
# File lib/rake.rb, line 91 91: def pathmap_explode 92: head, tail = File.split(self) 93: return [self] if head == self 94: return [tail] if head == '.' || tail == '/' 95: return [head, tail] if head == '/' 96: return head.pathmap_explode + [tail] 97: 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/rake.rb, line 103 103: def pathmap_partial(n) 104: dirs = File.dirname(self).pathmap_explode 105: partial_dirs = 106: if n > 0 107: dirs[0...n] 108: elsif n < 0 109: dirs.reverse[0...-n].reverse 110: else 111: "." 112: end 113: File.join(partial_dirs) 114: end
Preform the pathmap replacement operations on the given path. The patterns take the form ‘pat1,rep1;pat2,rep2…’.
# File lib/rake.rb, line 119 119: def pathmap_replace(patterns, &block) 120: result = self 121: patterns.split(';').each do |pair| 122: pattern, replacement = pair.split(',') 123: pattern = Regexp.new(pattern) 124: if replacement == '*' && block_given? 125: result = result.sub(pattern, &block) 126: elsif replacement 127: result = result.sub(pattern, replacement) 128: else 129: result = result.sub(pattern, '') 130: end 131: end 132: result 133: end