module Sass::Util
A module containing various useful functions.
Constants
- CHARSET_REGEXPS
- ENCODINGS_TO_CHECK
We could automatically add in any non-ASCII-compatible encodings here, but there’s not really a good way to do that without manually checking that each encoding encodes all ASCII characters properly, which takes long enough to affect the startup time of the CLI.
- MultibyteStringScanner
- RUBY_ENGINE
The Ruby engine we’re running under. Defaults to ‘“ruby”` if the top-level constant is undefined. @api public
- RUBY_VERSION
An array of ints representing the Ruby version number. @api public
Public Instance Methods
@private
# File lib/sass/util.rb, line 659 def _enc(string, encoding) string.encode(encoding).force_encoding("BINARY") end
Throws a NotImplementedError for an abstract method.
@param obj [Object] ‘self` @raise [NotImplementedError]
# File lib/sass/util.rb, line 380 def abstract(obj) raise NotImplementedError.new("#{obj.class} must implement ##{caller_info[2]}") end
Returns whether this environment is using ActionPack of a version greater than or equal to that specified.
@param version [String] The string version number to check against.
Should be greater than or equal to Rails 3, because otherwise ActionPack::VERSION isn't autoloaded
@return [Boolean]
# File lib/sass/util.rb, line 455 def ap_geq?(version) # The ActionPack module is always loaded automatically in Rails >= 3 return false unless defined?(ActionPack) && defined?(ActionPack::VERSION) && defined?(ActionPack::VERSION::STRING) version_geq(ActionPack::VERSION::STRING, version) end
Returns whether this environment is using ActionPack version 3.0.0 or greater.
@return [Boolean]
# File lib/sass/util.rb, line 444 def ap_geq_3? ap_geq?("3.0.0.beta1") end
Returns a sub-array of ‘minuend` containing only elements that are also in `subtrahend`. Ensures that the return value has the same order as `minuend`, even on Rubinius where that’s not guaranteed by {Array#-}.
@param minuend [Array] @param subtrahend [Array] @return [Array]
# File lib/sass/util.rb, line 266 def array_minus(minuend, subtrahend) return minuend - subtrahend unless rbx? set = Set.new(minuend) - subtrahend minuend.select {|e| set.include?(e)} end
Returns an ActionView::Template* class. In pre-3.0 versions of Rails, most of these classes were of the form ‘ActionView::TemplateFoo`, while afterwards they were of the form `ActionView;:Template::Foo`.
@param name [#to_s] The name of the class to get.
For example, `:Error` will return `ActionView::TemplateError` or `ActionView::Template::Error`.
# File lib/sass/util.rb, line 471 def av_template_class(name) return ActionView.const_get("Template#{name}") if ActionView.const_defined?("Template#{name}") return ActionView::Template.const_get(name.to_s) end
Returns information about the caller of the previous method.
@param entry [String] An entry in the ‘#caller` list, or a similarly formatted string @return [[String, Fixnum, (String, nil)]] An array containing the filename, line, and method name of the caller.
The method name may be nil
# File lib/sass/util.rb, line 328 def caller_info(entry = nil) # JRuby evaluates `caller` incorrectly when it's in an actual default argument. entry ||= caller[1] info = entry.scan(/^(.*?):(-?.*?)(?::.*`(.+)')?$/).first info[1] = info[1].to_i # This is added by Rubinius to designate a block, but we don't care about it. info[2].sub!(/ \{\}\Z/, '') if info[2] info end
Checks that the encoding of a string is valid in Ruby 1.9 and cleans up potential encoding gotchas like the UTF-8 BOM. If it’s not, yields an error string describing the invalid character and the line on which it occurrs.
@param str [String] The string of which to check the encoding @yield [msg] A block in which an encoding error can be raised.
Only yields if there is an encoding error
@yieldparam msg [String] The error message to be raised @return [String] ‘str`, potentially with encoding gotchas like BOMs removed
# File lib/sass/util.rb, line 585 def check_encoding(str) if ruby1_8? return str.gsub(/\A\xEF\xBB\xBF/, '') # Get rid of the UTF-8 BOM elsif str.valid_encoding? # Get rid of the Unicode BOM if possible if str.encoding.name =~ /^UTF-(8|16|32)(BE|LE)?$/ return str.gsub(Regexp.new("\\A\uFEFF".encode(str.encoding.name)), '') else return str end end encoding = str.encoding newlines = Regexp.new("\r\n|\r|\n".encode(encoding).force_encoding("binary")) str.force_encoding("binary").split(newlines).each_with_index do |line, i| begin line.encode(encoding) rescue Encoding::UndefinedConversionError => e yield <<MSG.rstrip, i + 1 Invalid #{encoding.name} character #{undefined_conversion_error_char(e)} MSG end end return str end
Asserts that ‘value` falls within `range` (inclusive), leaving room for slight floating-point errors.
@param name [String] The name of the value. Used in the error message. @param range [Range] The allowed range of values. @param value [Numeric, Sass::Script::Number
] The value to check. @param unit [String] The unit of the value. Used in error reporting. @return [Numeric] ‘value` adjusted to fall within range, if it
was outside by a floating-point margin.
# File lib/sass/util.rb, line 295 def check_range(name, range, value, unit='') grace = (-0.00001..0.00001) str = value.to_s value = value.value if value.is_a?(Sass::Script::Number) return value if range.include?(value) return range.first if grace.include?(value - range.first) return range.last if grace.include?(value - range.last) raise ArgumentError.new( "#{name} #{str} must be between #{range.first}#{unit} and #{range.last}#{unit}") end
Like {#check_encoding}, but also checks for a ‘@charset` declaration at the beginning of the file and uses that encoding if it exists.
The Sass
encoding rules are simple. If a ‘@charset` declaration exists, we assume that that’s the original encoding of the document. Otherwise, we use whatever encoding Ruby has. Then we convert that to UTF-8 to process internally. The UTF-8 end result is what’s returned by this method.
@param str [String] The string of which to check the encoding @yield [msg] A block in which an encoding error can be raised.
Only yields if there is an encoding error
@yieldparam msg [String] The error message to be raised @return [(String, Encoding)] The original string encoded as UTF-8,
and the source encoding of the string (or `nil` under Ruby 1.8)
@raise [Encoding::UndefinedConversionError] if the source encoding
cannot be converted to UTF-8
@raise [ArgumentError] if the document uses an unknown encoding with ‘@charset`
# File lib/sass/util.rb, line 630 def check_sass_encoding(str, &block) return check_encoding(str, &block), nil if ruby1_8? # We allow any printable ASCII characters but double quotes in the charset decl bin = str.dup.force_encoding("BINARY") encoding = Sass::Util::ENCODINGS_TO_CHECK.find do |enc| re = Sass::Util::CHARSET_REGEXPS[enc] re && bin =~ re end charset, bom = $1, $2 if charset charset = charset.force_encoding(encoding).encode("UTF-8") if endianness = encoding[/[BL]E$/] begin Encoding.find(charset + endianness) charset << endianness rescue ArgumentError # Encoding charset + endianness doesn't exist end end str.force_encoding(charset) elsif bom str.force_encoding(encoding) end str = check_encoding(str, &block) return str.encode("UTF-8"), str.encoding end
Prepare a value for a destructuring assignment (e.g. ‘a, b = val`). This works around a performance bug when using ActiveSupport, and only needs to be called when `val` is likely to be `nil` reasonably often.
See [this bug report](redmine.ruby-lang.org/issues/4917).
@param val [Object] @return [Object]
# File lib/sass/util.rb, line 530 def destructure(val) val || [] end
A version of ‘Enumerable#enum_cons` that works in Ruby 1.8 and 1.9.
@param enum [Enumerable] The enumerable to get the enumerator for @param n [Fixnum] The size of each cons @return [Enumerator] The consed enumerator
# File lib/sass/util.rb, line 717 def enum_cons(enum, n) ruby1_8? ? enum.enum_cons(n) : enum.each_cons(n) end
A version of ‘Enumerable#enum_slice` that works in Ruby 1.8 and 1.9.
@param enum [Enumerable] The enumerable to get the enumerator for @param n [Fixnum] The size of each slice @return [Enumerator] The consed enumerator
# File lib/sass/util.rb, line 726 def enum_slice(enum, n) ruby1_8? ? enum.enum_slice(n) : enum.each_slice(n) end
A version of ‘Enumerable#enum_with_index` that works in Ruby 1.8 and 1.9.
@param enum [Enumerable] The enumerable to get the enumerator for @return [Enumerator] The with-index enumerator
# File lib/sass/util.rb, line 708 def enum_with_index(enum) ruby1_8? ? enum.enum_with_index : enum.each_with_index end
Destructively removes all elements from an array that match a block, and returns the removed elements.
@param array [Array] The array from which to remove elements. @yield [el] Called for each element. @yieldparam el [*] The element to test. @yieldreturn [Boolean] Whether or not to extract the element. @return [Array] The extracted elements.
# File lib/sass/util.rb, line 738 def extract!(array) out = [] array.reject! do |e| next false unless yield e out << e true end out end
Extracts the non-string vlaues from an array containing both strings and non-strings. These values are replaced with escape sequences. This can be undone using {#inject_values}.
This is useful e.g. when we want to do string manipulation on an interpolated string.
The precise format of the resulting string is not guaranteed. However, it is guaranteed that newlines and whitespace won’t be affected.
@param arr [Array] The array from which values are extracted. @return [(String, Array)] The resulting string, and an array of extracted values.
# File lib/sass/util.rb, line 813 def extract_values(arr) values = [] return arr.map do |e| next e.gsub('{', '{{') if e.is_a?(String) values << e next "{#{values.count - 1}}" end.join, values end
Flattens the first ‘n` nested arrays in a cross-version manner.
@param arr [Array] The array to flatten @param n [Fixnum] The number of levels to flatten @return [Array] The flattened array
# File lib/sass/util.rb, line 761 def flatten(arr, n) return arr.flatten(n) unless ruby1_8_6? return arr if n == 0 arr.inject([]) {|res, e| e.is_a?(Array) ? res.concat(flatten(e, n - 1)) : res << e} end
Like ‘Dir.glob`, but works with backslash-separated paths on Windows.
@param path [String]
# File lib/sass/util.rb, line 516 def glob(path, &block) path = path.gsub('\\', '/') if windows? Dir.glob(path, &block) end
Performs the equivalent of ‘enum.group_by.to_a`, but with a guaranteed order. Unlike [#hash_to_a], the resulting order isn’t sorted key order; instead, it’s the same order as ‘#group_by` has under Ruby 1.9 (key appearance order).
@param enum [Enumerable] @return [Array<[Object, Array]>] An array of pairs.
# File lib/sass/util.rb, line 243 def group_by_to_a(enum, &block) return enum.group_by(&block).to_a unless ruby1_8? order = {} arr = [] enum.group_by do |e| res = block[e] unless order.include?(res) order[res] = order.size end res end.each do |key, vals| arr[order[key]] = [key, vals] end arr end
Checks to see if a class has a given method. For example:
Sass::Util.has?(:public_instance_method, String, :gsub) #=> true
Method collections like ‘Class#instance_methods` return strings in Ruby 1.8 and symbols in Ruby 1.9 and on, so this handles checking for them in a compatible way.
@param attr [#to_s] The (singular) name of the method-collection method
(e.g. `:instance_methods`, `:private_methods`)
@param klass [Module] The class to check the methods of which to check @param method [String, Symbol] The name of the method do check for @return [Boolean] Whether or not the given collection has the given method
# File lib/sass/util.rb, line 700 def has?(attr, klass, method) klass.send("#{attr}s").include?(ruby1_8? ? method.to_s : method.to_sym) end
Converts a Hash to an Array. This is usually identical to ‘Hash#to_a`, with the following exceptions:
-
In Ruby 1.8, ‘Hash#to_a` is not deterministically ordered, but this is.
-
In Ruby 1.9 when running tests, this is ordered in the same way it would be under Ruby 1.8 (sorted key order rather than insertion order).
@param hash [Hash] @return [Array]
# File lib/sass/util.rb, line 231 def hash_to_a(hash) return hash.to_a unless ruby1_8? || defined?(Test::Unit) return hash.sort_by {|k, v| k} end
Undoes {#extract_values} by transforming a string with escape sequences into an array of strings and non-string values.
@param str [String] The string with escape sequences. @param values [Array] The array of values to inject. @return [Array] The array of strings and values.
# File lib/sass/util.rb, line 828 def inject_values(str, values) return [str.gsub('{{', '{')] if values.empty? # Add an extra { so that we process the tail end of the string result = (str + '{{').scan(/(.*?)(?:(\{\{)|\{(\d+)\})/m).map do |(pre, esc, n)| [pre, esc ? '{' : '', n ? values[n.to_i] : ''] end.flatten(1) result[-2] = '' # Get rid of the extra { merge_adjacent_strings(result).reject {|s| s == ''} end
Like ‘Object#inspect`, but preserves non-ASCII characters rather than escaping them under Ruby 1.9.2. This is necessary so that the precompiled Haml template can be `#encode`d into `@options` before being evaluated.
@param obj {Object} @return {String}
# File lib/sass/util.rb, line 794 def inspect_obj(obj) return obj.inspect unless version_geq(::RUBY_VERSION, "1.9.2") return ':' + inspect_obj(obj.to_s) if obj.is_a?(Symbol) return obj.inspect unless obj.is_a?(String) '"' + obj.gsub(/[\x00-\x7F]+/) {|s| s.inspect[1...-1]} + '"' end
Intersperses a value in an enumerable, as would be done with ‘Array#join` but without concatenating the array together afterwards.
@param enum [Enumerable] @param val @return [Array]
# File lib/sass/util.rb, line 154 def intersperse(enum, val) enum.inject([]) {|a, e| a << e << val}[0...-1] end
Whether or not this is running on IronRuby.
@return [Boolean]
# File lib/sass/util.rb, line 488 def ironruby? RUBY_ENGINE == "ironruby" end
Wehter or not this is running under JRuby 1.6 or lower.
# File lib/sass/util.rb, line 564 def jruby1_6? jruby? && jruby_version[0] == 1 && jruby_version[1] < 7 end
Whether or not this is running on JRuby.
@return [Boolean]
# File lib/sass/util.rb, line 502 def jruby? RUBY_PLATFORM =~ /java/ end
Returns an array of ints representing the JRuby version number.
@return [Array<Fixnum>]
# File lib/sass/util.rb, line 509 def jruby_version $jruby_version ||= ::JRUBY_VERSION.split(".").map {|s| s.to_i} end
Computes a single longest common subsequence for ‘x` and `y`. If there are more than one longest common subsequences, the one returned is that which starts first in `x`.
@param x [Array] @param y [Array] @yield [a, b] An optional block to use in place of a check for equality
between elements of `x` and `y`.
@yieldreturn [Object, nil] If the two values register as equal,
this will return the value to use in the LCS array.
@return [Array] The LCS
# File lib/sass/util.rb, line 215 def lcs(x, y, &block) x = [nil, *x] y = [nil, *y] block ||= proc {|a, b| a == b && a} lcs_backtrace(lcs_table(x, y, &block), x, y, x.size-1, y.size-1, &block) end
Whether or not this is running under MacRuby.
@return [Boolean]
# File lib/sass/util.rb, line 571 def macruby? RUBY_ENGINE == 'macruby' end
Maps the key-value pairs of a hash according to a block.
@example
map_hash({:foo => "bar", :baz => "bang"}) {|k, v| [k.to_s, v.to_sym]} #=> {"foo" => :bar, "baz" => :bang}
@param hash [Hash] The hash to map @yield [key, value] A block in which the key-value pairs are transformed @yieldparam [key] The hash key @yieldparam [value] The hash value @yieldreturn [(Object
, Object
)] The new value for the ‘[key, value]` pair @return [Hash] The mapped hash @see map_keys
@see map_vals
# File lib/sass/util.rb, line 88 def map_hash(hash) # Using &block here completely hoses performance on 1.8. to_hash(hash.map {|k, v| yield k, v}) end
Maps the keys in a hash according to a block.
@example
map_keys({:foo => "bar", :baz => "bang"}) {|k| k.to_s} #=> {"foo" => "bar", "baz" => "bang"}
@param hash [Hash] The hash to map @yield [key] A block in which the keys are transformed @yieldparam key [Object] The key that should be mapped @yieldreturn [Object] The new value for the key @return [Hash] The mapped hash @see map_vals
@see map_hash
# File lib/sass/util.rb, line 55 def map_keys(hash) to_hash(hash.map {|k, v| [yield(k), v]}) end
Maps the values in a hash according to a block.
@example
map_values({:foo => "bar", :baz => "bang"}) {|v| v.to_sym} #=> {:foo => :bar, :baz => :bang}
@param hash [Hash] The hash to map @yield [value] A block in which the values are transformed @yieldparam value [Object] The value that should be mapped @yieldreturn [Object] The new value for the value @return [Hash] The mapped hash @see map_keys
@see map_hash
# File lib/sass/util.rb, line 71 def map_vals(hash) to_hash(hash.map {|k, v| [k, yield(v)]}) end
Concatenates all strings that are adjacent in an array, while leaving other elements as they are.
@example
merge_adjacent_strings([1, "foo", "bar", 2, "baz"]) #=> [1, "foobar", 2, "baz"]
@param arr [Array] @return [Array] The enumerable with strings merged
# File lib/sass/util.rb, line 131 def merge_adjacent_strings(arr) # Optimize for the common case of one element return arr if arr.size < 2 arr.inject([]) do |a, e| if e.is_a?(String) if a.last.is_a?(String) a.last << e else a << e.dup end else a << e end a end end
Returns the ASCII code of the given character.
@param c [String] All characters but the first are ignored. @return [Fixnum] The ASCII code of ‘c`.
# File lib/sass/util.rb, line 752 def ord(c) ruby1_8? ? c[0] : c.ord end
Return an array of all possible paths through the given arrays.
@param arrs [Array<Array>] @return [Array<Arrays>]
@example
paths([[1, 2], [3, 4], [5]]) #=> # [[1, 3, 5], # [2, 3, 5], # [1, 4, 5], # [2, 4, 5]]
# File lib/sass/util.rb, line 198 def paths(arrs) arrs.inject([[]]) do |paths, arr| flatten(arr.map {|e| paths.map {|path| path + [e]}}, 1) end end
Computes the powerset of the given array. This is the set of all subsets of the array.
@example
powerset([1, 2, 3]) #=> Set[Set[], Set[1], Set[2], Set[3], Set[1, 2], Set[2, 3], Set[1, 3], Set[1, 2, 3]]
@param arr [Enumerable] @return [Set<Set>] The subsets of ‘arr`
# File lib/sass/util.rb, line 101 def powerset(arr) arr.inject([Set.new].to_set) do |powerset, el| new_powerset = Set.new powerset.each do |subset| new_powerset << subset new_powerset << subset + [el] end new_powerset end end
Returns the environment of the Rails application, if this is running in a Rails context. Returns ‘nil` if no such environment is defined.
@return [String, nil]
# File lib/sass/util.rb, line 434 def rails_env return ::Rails.env.to_s if defined?(::Rails.env) return RAILS_ENV.to_s if defined?(RAILS_ENV) return nil end
Returns the root of the Rails application, if this is running in a Rails context. Returns ‘nil` if no such root is defined.
@return [String, nil]
# File lib/sass/util.rb, line 420 def rails_root if defined?(::Rails.root) return ::Rails.root.to_s if ::Rails.root raise "ERROR: Rails.root is nil!" end return RAILS_ROOT.to_s if defined?(RAILS_ROOT) return nil end
Whether or not this is running on Rubinius.
@return [Boolean]
# File lib/sass/util.rb, line 495 def rbx? RUBY_ENGINE == "rbx" end
Restricts a number to falling within a given range. Returns the number if it falls within the range, or the closest value in the range if it doesn’t.
@param value [Numeric] @param range [Range<Numeric>] @return [Numeric]
# File lib/sass/util.rb, line 119 def restrict(value, range) [[value, range.first].max, range.last].min end
Whether or not this is running under a Ruby version under 2.0.
@return [Boolean]
# File lib/sass/util.rb, line 539 def ruby1? Sass::Util::RUBY_VERSION[0] <= 1 end
Whether or not this is running under Ruby 1.8 or lower.
Note that IronRuby counts as Ruby 1.8, because it doesn’t support the Ruby 1.9 encoding API.
@return [Boolean]
# File lib/sass/util.rb, line 549 def ruby1_8? # IronRuby says its version is 1.9, but doesn't support any of the encoding APIs. # We have to fall back to 1.8 behavior. ironruby? || (Sass::Util::RUBY_VERSION[0] == 1 && Sass::Util::RUBY_VERSION[1] < 9) end
Whether or not this is running under Ruby 1.8.6 or lower. Note that lower versions are not officially supported.
@return [Boolean]
# File lib/sass/util.rb, line 559 def ruby1_8_6? ruby1_8? && Sass::Util::RUBY_VERSION[2] < 7 end
The same as ‘Kernel#warn`, but is silenced by {#silence_sass_warnings}.
@param msg [String]
# File lib/sass/util.rb, line 408 def sass_warn(msg) msg = msg + "\n" unless ruby1? Sass.logger.warn(msg) end
Tests the hash-equality of two sets in a cross-version manner. Aggravatingly, this is order-dependent in Ruby 1.8.6.
@param set1 [Set] @param set2 [Set] @return [Boolean] Whether or not the sets are hashcode equal
# File lib/sass/util.rb, line 783 def set_eql?(set1, set2) return set1.eql?(set2) unless ruby1_8_6? set1.to_a.uniq.sort_by {|e| e.hash}.eql?(set2.to_a.uniq.sort_by {|e| e.hash}) end
Returns the hash code for a set in a cross-version manner. Aggravatingly, this is order-dependent in Ruby 1.8.6.
@param set [Set] @return [Fixnum] The order-independent hashcode of ‘set`
# File lib/sass/util.rb, line 772 def set_hash(set) return set.hash unless ruby1_8_6? set.map {|e| e.hash}.uniq.sort.hash end
Silence all output to STDERR within a block.
@yield A block in which no output will be printed to STDERR
# File lib/sass/util.rb, line 387 def silence_warnings the_real_stderr, $stderr = $stderr, StringIO.new yield ensure $stderr = the_real_stderr end
Destructively strips whitespace from the beginning and end of the first and last elements, respectively, in the array (if those elements are strings).
@param arr [Array] @return [Array] ‘arr`
# File lib/sass/util.rb, line 181 def strip_string_array(arr) arr.first.lstrip! if arr.first.is_a?(String) arr.last.rstrip! if arr.last.is_a?(String) arr end
Returns whether or not ‘seq1` is a subsequence of `seq2`. That is, whether or not `seq2` contains every element in `seq1` in the same order (and possibly more elements besides).
@param seq1 [Array] @param seq2 [Array] @return [Boolean]
# File lib/sass/util.rb, line 313 def subsequence?(seq1, seq2) i = j = 0 loop do return true if i == seq1.size return false if j == seq2.size i += 1 if seq1[i] == seq2[j] j += 1 end end
Substitutes a sub-array of one array with another sub-array.
@param ary [Array] The array in which to make the substitution @param from [Array] The sequence of elements to replace with ‘to` @param to [Array] The sequence of elements to replace `from` with
# File lib/sass/util.rb, line 163 def substitute(ary, from, to) res = ary.dup i = 0 while i < res.size if res[i...i+from.size] == from res[i...i+from.size] = to end i += 1 end res end
Returns a string description of the character that caused an ‘Encoding::UndefinedConversionError`.
@param [Encoding::UndefinedConversionError] @return [String]
# File lib/sass/util.rb, line 277 def undefined_conversion_error_char(e) # Rubinius (as of 2.0.0.rc1) pre-quotes the error character. return e.error_char if rbx? # JRuby (as of 1.7.2) doesn't have an error_char field on # Encoding::UndefinedConversionError. return e.error_char.dump unless jruby? e.message[/^"[^"]+"/] #" end
Returns whether one version string represents the same or a more recent version than another.
@param v1 [String] A version string. @param v2 [String] Another version string. @return [Boolean]
# File lib/sass/util.rb, line 372 def version_geq(v1, v2) version_gt(v1, v2) || !version_gt(v2, v1) end
Returns whether one version string represents a more recent version than another.
@param v1 [String] A version string. @param v2 [String] Another version string. @return [Boolean]
# File lib/sass/util.rb, line 343 def version_gt(v1, v2) # Construct an array to make sure the shorter version is padded with nil Array.new([v1.length, v2.length].max).zip(v1.split("."), v2.split(".")) do |_, p1, p2| p1 ||= "0" p2 ||= "0" release1 = p1 =~ /^[0-9]+$/ release2 = p2 =~ /^[0-9]+$/ if release1 && release2 # Integer comparison if both are full releases p1, p2 = p1.to_i, p2.to_i next if p1 == p2 return p1 > p2 elsif !release1 && !release2 # String comparison if both are prereleases next if p1 == p2 return p1 > p2 else # If only one is a release, that one is newer return release1 end end end
Whether or not this is running on Windows.
@return [Boolean]
# File lib/sass/util.rb, line 481 def windows? RbConfig::CONFIG['host_os'] =~ /mswin|windows|mingw/i end
Allows modifications to be performed on the string form of an array containing both strings and non-strings.
@param arr [Array] The array from which values are extracted. @yield [str] A block in which string manipulation can be done to the array. @yieldparam str [String] The string form of ‘arr`. @yieldreturn [String] The modified string. @return [Array] The modified, interpolated array.
# File lib/sass/util.rb, line 846 def with_extracted_values(arr) str, vals = extract_values(arr) str = yield str inject_values(str, vals) end
Private Instance Methods
Computes a single longest common subsequence for arrays x and y. Algorithm from [Wikipedia](en.wikipedia.org/wiki/Longest_common_subsequence_problem#Reading_out_an_LCS)
# File lib/sass/util.rb, line 894 def lcs_backtrace(c, x, y, i, j, &block) return [] if i == 0 || j == 0 if v = yield(x[i], y[j]) return lcs_backtrace(c, x, y, i-1, j-1, &block) << v end return lcs_backtrace(c, x, y, i, j-1, &block) if c[i][j-1] > c[i-1][j] return lcs_backtrace(c, x, y, i-1, j, &block) end
Calculates the memoization table for the Least Common Subsequence algorithm. Algorithm from [Wikipedia](en.wikipedia.org/wiki/Longest_common_subsequence_problem#Computing_the_length_of_the_LCS)
# File lib/sass/util.rb, line 875 def lcs_table(x, y) c = Array.new(x.size) {[]} x.size.times {|i| c[i][0] = 0} y.size.times {|j| c[0][j] = 0} (1...x.size).each do |i| (1...y.size).each do |j| c[i][j] = if yield x[i], y[j] c[i-1][j-1] + 1 else [c[i][j-1], c[i-1][j]].max end end end return c end