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 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.
# File lib/rake.rb, line 82 82: def ext(newext='') 83: return self.dup if ['.', '..'].include? self 84: if newext != '' 85: newext = (newext =~ /^\./) ? newext : ("." + newext) 86: end 87: dup.sub!(%r(([^/\\])\.[^./\\]*$)) { $1 + newext } || self + newext 88: 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 198 198: def pathmap(spec=nil, &block) 199: return self if spec.nil? 200: result = '' 201: spec.scan(/%\{[^}]*\}-?\d*[sdpfnxX%]|%-?\d+d|%.|[^%]+/) do |frag| 202: case frag 203: when '%f' 204: result << File.basename(self) 205: when '%n' 206: result << File.basename(self).ext 207: when '%d' 208: result << File.dirname(self) 209: when '%x' 210: result << $1 if self =~ /[^\/](\.[^.]+)$/ 211: when '%X' 212: if self =~ /^(.*[^\/])(\.[^.]+)$/ 213: result << $1 214: else 215: result << self 216: end 217: when '%p' 218: result << self 219: when '%s' 220: result << (File::ALT_SEPARATOR || File::SEPARATOR) 221: when '%-' 222: # do nothing 223: when '%%' 224: result << "%" 225: when /%(-?\d+)d/ 226: result << pathmap_partial($1.to_i) 227: when /^%\{([^}]*)\}(\d*[dpfnxX])/ 228: patterns, operator = $1, $2 229: result << pathmap('%' + operator).pathmap_replace(patterns, &block) 230: when /^%/ 231: fail ArgumentError, "Unknown pathmap specifier #{frag} in '#{spec}'" 232: else 233: result << frag 234: end 235: end 236: result 237: end
Explode a path into individual components. Used by pathmap.
# File lib/rake.rb, line 93 93: def pathmap_explode 94: head, tail = File.split(self) 95: return [self] if head == self 96: return [tail] if head == '.' || tail == '/' 97: return [head, tail] if head == '/' 98: return head.pathmap_explode + [tail] 99: 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 105 105: def pathmap_partial(n) 106: dirs = File.dirname(self).pathmap_explode 107: partial_dirs = 108: if n > 0 109: dirs[0...n] 110: elsif n < 0 111: dirs.reverse[0...-n].reverse 112: else 113: "." 114: end 115: File.join(partial_dirs) 116: end
Preform the pathmap replacement operations on the given path. The patterns take the form ‘pat1,rep1;pat2,rep2…’.
# File lib/rake.rb, line 121 121: def pathmap_replace(patterns, &block) 122: result = self 123: patterns.split(';').each do |pair| 124: pattern, replacement = pair.split(',') 125: pattern = Regexp.new(pattern) 126: if replacement == '*' && block_given? 127: result = result.sub(pattern, &block) 128: elsif replacement 129: result = result.sub(pattern, replacement) 130: else 131: result = result.sub(pattern, '') 132: end 133: end 134: result 135: end