module Haml::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.

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

_enc(string, encoding) click to toggle source

@private

# File lib/haml/util.rb, line 583
def _enc(string, encoding)
  string.encode(encoding).force_encoding("BINARY")
end
abstract(obj) click to toggle source

Throws a NotImplementedError for an abstract method.

@param obj [Object] `self` @raise [NotImplementedError]

# File lib/haml/util.rb, line 305
def abstract(obj)
  raise NotImplementedError.new("#{obj.class} must implement ##{caller_info[2]}")
end
ap_geq?(version) click to toggle source

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/haml/util.rb, line 410
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
ap_geq_3?() click to toggle source

Returns whether this environment is using ActionPack version 3.0.0 or greater.

@return [Boolean]

# File lib/haml/util.rb, line 399
def ap_geq_3?
  ap_geq?("3.0.0.beta1")
end
assert_html_safe!(text) click to toggle source

Assert that a given object (usually a String) is HTML safe according to Rails’ XSS handling, if it’s loaded.

@param text [Object]

# File lib/haml/util.rb, line 458
def assert_html_safe!(text)
  return unless rails_xss_safe? && text && !text.to_s.html_safe?
  raise Haml::Error.new("Expected #{text.inspect} to be HTML-safe.")
end
av_template_class(name) click to toggle source

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/haml/util.rb, line 426
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
caller_info(entry = caller[1]) click to toggle source

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/haml/util.rb, line 226
def caller_info(entry = caller[1])
  info = entry.scan(%r^(.*?):(-?.*?)(?::.*`(.+)')?$/).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!(%r \{\}\Z/, '') if info[2]
  info
end
check_encoding(str) { |< click to toggle source

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/haml/util.rb, line 523
    def check_encoding(str)
      if ruby1_8?
        return str.gsub(%r\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 =~ %r^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 #{e.error_char.dump}
MSG
        end
      end
      return str
    end
check_haml_encoding(str, &block) click to toggle source

Like {#check_encoding}, but also checks for a Ruby-style `-# coding:` comment at the beginning of the template and uses that encoding if it exists.

The Haml encoding rules are simple. If a `-# coding:` comment exists, we assume that that’s the original encoding of the document. Otherwise, we use whatever encoding Ruby has.

Haml uses the same rules for parsing coding comments as Ruby. This means that it can understand Emacs-style comments (e.g. `-*- encoding: "utf-8" -*-`), and also that it cannot understand non-ASCII-compatible encodings such as `UTF-16` and `UTF-32`.

@param str [String] The Haml template 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] The original string encoded properly @raise [ArgumentError] if the document declares an unknown encoding

# File lib/haml/util.rb, line 569
def check_haml_encoding(str, &block)
  return check_encoding(str, &block) if ruby1_8?
  str = str.dup if str.frozen?

  bom, encoding = parse_haml_magic_comment(str)
  if encoding; str.force_encoding(encoding)
  elsif bom; str.force_encoding("UTF-8")
  end

  return check_encoding(str, &block)
end
def_static_method(klass, name, args, *vars) click to toggle source

This is used for methods in {Haml::Buffer} that need to be very fast, and take a lot of boolean parameters that are known at compile-time. Instead of passing the parameters in normally, a separate method is defined for every possible combination of those parameters; these are then called using {#static_method_name}.

To define a static method, an ERB template for the method is provided. All conditionals based on the static parameters are done as embedded Ruby within this template. For example:

def_static_method(Foo, :my_static_method, [:foo, :bar], :baz, :bang, <<RUBY)
  <% if baz && bang %>
    return foo + bar
  <% elsif baz || bang %>
    return foo - bar
  <% else %>
    return 17
  <% end %>
RUBY

{#static_method_name} can be used to call static methods.

@overload #def_static_method(klass, name, args, *vars, erb) @param klass [Module] The class on which to define the static method @param name [to_s] The (base) name of the static method @param args [Array<Symbol>] The names of the arguments to the defined methods

(**not** to the ERB template)

@param vars [Array<Symbol>] The names of the static boolean variables

to be made available to the ERB template

@param erb [String] The template for the method code

# File lib/haml/util.rb, line 756
    def def_static_method(klass, name, args, *vars)
      erb = vars.pop
      info = caller_info
      powerset(vars).each do |set|
        context = StaticConditionalContext.new(set).instance_eval {binding}
        klass.class_eval("def #{static_method_name(name, *vars.map {|v| set.include?(v)})}(#{args.join(', ')})
  #{ERB.new(erb).result(context)}
end
", info[0], info[1])
      end
    end
dump(obj) click to toggle source

A wrapper for `Marshal.dump` that calls `#_before_dump` on the object before dumping it, `#_after_dump` afterwards. It also calls `#_around_dump` and passes it a block in which the object is dumped.

If any of these methods are undefined, they are not called.

@param obj [Object] The object to dump. @return [String] The dumped data.

# File lib/haml/util.rb, line 280
def dump(obj)
  obj._before_dump if obj.respond_to?(:_before_dump)
  return Marshal.dump(obj) unless obj.respond_to?(:_around_dump)
  res = nil
  obj._around_dump {res = Marshal.dump(obj)}
  res
ensure
  obj._after_dump if obj.respond_to?(:_after_dump)
end
enum_cons(enum, n) click to toggle source

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/haml/util.rb, line 639
def enum_cons(enum, n)
  ruby1_8? ? enum.enum_cons(n) : enum.each_cons(n)
end
enum_slice(enum, n) click to toggle source

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/haml/util.rb, line 648
def enum_slice(enum, n)
  ruby1_8? ? enum.enum_slice(n) : enum.each_slice(n)
end
enum_with_index(enum) click to toggle source

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/haml/util.rb, line 630
def enum_with_index(enum)
  ruby1_8? ? enum.enum_with_index : enum.each_with_index
end
flatten(arr, n) click to toggle source

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/haml/util.rb, line 665
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
haml_warn(msg) click to toggle source

The same as `Kernel#warn`, but is silenced by {#silence_haml_warnings}.

@param msg [String]

# File lib/haml/util.rb, line 334
def haml_warn(msg)
  return if @@silence_warnings
  warn(msg)
end
has?(attr, klass, method) click to toggle source

Checks to see if a class has a given method. For example:

Haml::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/haml/util.rb, line 622
def has?(attr, klass, method)
  klass.send("#{attr}s").include?(ruby1_8? ? method.to_s : method.to_sym)
end
html_safe(text) click to toggle source

Returns the given text, marked as being HTML-safe. With older versions of the Rails XSS-safety mechanism, this destructively modifies the HTML-safety of `text`.

@param text [String, nil] @return [String, nil] `text`, marked as HTML-safe

# File lib/haml/util.rb, line 448
def html_safe(text)
  return unless text
  return text.html_safe if defined?(ActiveSupport::SafeBuffer)
  text.html_safe!
end
inspect_obj(obj) click to toggle source

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/haml/util.rb, line 698
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(%r[\x00-\x7F]+/) {|s| s.inspect[1...-1]} + '"'
end
intersperse(enum, val) click to toggle source

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/haml/util.rb, line 153
def intersperse(enum, val)
  enum.inject([]) {|a, e| a << e << val}[0...-1]
end
ironruby?() click to toggle source

Whether or not this is running on IronRuby.

@return [Boolean]

# File lib/haml/util.rb, line 487
def ironruby?
  RUBY_ENGINE == "ironruby"
end
lcs(x, y, &block) click to toggle source

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/haml/util.rb, line 214
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
load(data) click to toggle source

A wrapper for `Marshal.load` that calls `#_after_load` on the object after loading it, if it’s defined.

@param data [String] The data to load. @return [Object] The loaded object.

# File lib/haml/util.rb, line 295
def load(data)
  obj = Marshal.load(data)
  obj._after_load if obj.respond_to?(:_after_load)
  obj
end
map_hash(hash, &block) click to toggle source

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/haml/util.rb, line 88
def map_hash(hash, &block)
  to_hash(hash.map(&block))
end
map_keys(hash) { |k| ... } click to toggle source

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/haml/util.rb, line 55
def map_keys(hash)
  to_hash(hash.map {|k, v| [yield(k), v]})
end
map_vals(hash) { |v| ... } click to toggle source

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/haml/util.rb, line 71
def map_vals(hash)
  to_hash(hash.map {|k, v| [k, yield(v)]})
end
merge_adjacent_strings(arr) click to toggle source

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/haml/util.rb, line 130
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
ord(c) click to toggle source

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/haml/util.rb, line 656
def ord(c)
  ruby1_8? ? c[0] : c.ord
end
paths(arrs) click to toggle source

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/haml/util.rb, line 197
def paths(arrs)
  arrs.inject([[]]) do |paths, arr|
    flatten(arr.map {|e| paths.map {|path| path + [e]}}, 1)
  end
end
powerset(arr) click to toggle source

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/haml/util.rb, line 100
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
rails_env() click to toggle source

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/haml/util.rb, line 389
def rails_env
  return ::Rails.env.to_s if defined?(::Rails.env)
  return RAILS_ENV.to_s if defined?(RAILS_ENV)
  return nil
end
rails_root() click to toggle source

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/haml/util.rb, line 375
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
rails_safe_buffer_class() click to toggle source

The class for the Rails SafeBuffer XSS protection class. This varies depending on Rails version.

@return [Class]

# File lib/haml/util.rb, line 467
def rails_safe_buffer_class
  # It's important that we check ActiveSupport first,
  # because in Rails 2.3.6 ActionView::SafeBuffer exists
  # but is a deprecated proxy object.
  return ActiveSupport::SafeBuffer if defined?(ActiveSupport::SafeBuffer)
  return ActionView::SafeBuffer
end
rails_xss_safe?() click to toggle source

Whether or not ActionView’s XSS protection is available and enabled, as is the default for Rails 3.0+, and optional for version 2.3.5+. Overridden in haml/template.rb if this is the case.

@return [Boolean]

# File lib/haml/util.rb, line 438
def rails_xss_safe?
  false
end
restrict(value, range) click to toggle source

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/haml/util.rb, line 118
def restrict(value, range)
  [[value, range.first].max, range.last].min
end
ruby1_8?() click to toggle source

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/haml/util.rb, line 499
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? || (Haml::Util::RUBY_VERSION[0] == 1 && Haml::Util::RUBY_VERSION[1] < 9)
end
ruby1_8_6?() click to toggle source

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/haml/util.rb, line 509
def ruby1_8_6?
  ruby1_8? && Haml::Util::RUBY_VERSION[2] < 7
end
scope(file) click to toggle source

Returns the path of a file relative to the Haml root directory.

@param file [String] The filename relative to the Haml root @return [String] The filename relative to the the working directory

# File lib/haml/util.rb, line 28
def scope(file)
  File.join(Haml::ROOT_DIR, file)
end
set_eql?(set1, set2) click to toggle source

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/haml/util.rb, line 687
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
set_hash(set) click to toggle source

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/haml/util.rb, line 676
def set_hash(set)
  return set.hash unless ruby1_8_6?
  set.map {|e| e.hash}.uniq.sort.hash
end
silence_haml_warnings() { || ... } click to toggle source

Silences all Haml warnings within a block.

@yield A block in which no Haml warnings will be printed

# File lib/haml/util.rb, line 323
def silence_haml_warnings
  old_silence_warnings = @@silence_warnings
  @@silence_warnings = true
  yield
ensure
  @@silence_warnings = old_silence_warnings
end
silence_warnings() { || ... } click to toggle source

Silence all output to STDERR within a block.

@yield A block in which no output will be printed to STDERR

# File lib/haml/util.rb, line 312
def silence_warnings
  the_real_stderr, $stderr = $stderr, StringIO.new
  yield
ensure
  $stderr = the_real_stderr
end
static_method_name(name, *vars) click to toggle source

Computes the name for a method defined via {#def_static_method}.

@param name [String] The base name of the static method @param vars [Array<Boolean>] The static variable assignment @return [String] The real name of the static method

# File lib/haml/util.rb, line 774
def static_method_name(name, *vars)
  "#{name}_#{vars.map {|v| !!v}.join('_')}"
end
strip_string_array(arr) click to toggle source

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/haml/util.rb, line 180
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
substitute(ary, from, to) click to toggle source

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/haml/util.rb, line 162
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
to_hash(arr) click to toggle source

Converts an array of `[key, value]` pairs to a hash.

@example

to_hash([[:foo, "bar"], [:baz, "bang"]])
  #=> {:foo => "bar", :baz => "bang"}

@param arr [Array<(Object, Object)>] An array of pairs @return [Hash] A hash

# File lib/haml/util.rb, line 39
def to_hash(arr)
  Hash[arr.compact]
end
try_sass() click to toggle source

Try loading Sass. If the `sass` gem isn’t installed, print a warning and load from the vendored gem.

@return [Boolean] True if Sass was successfully loaded from the `sass` gem,

false otherwise.
# File lib/haml/util.rb, line 344
    def try_sass
      return true if defined?(::SASS_BEGUN_TO_LOAD)
      begin
        require 'sass/version'
        loaded = Sass.respond_to?(:version) && Sass.version[:major] &&
          Sass.version[:minor] && ((Sass.version[:major] > 3 && Sass.version[:minor] > 1) ||
          ((Sass.version[:major] == 3 && Sass.version[:minor] >= 1) &&
            (Sass.version[:prerelease] || Sass.version[:name] != "Bleeding Edge")))
      rescue LoadError => e
        loaded = false
      end

      unless loaded
        haml_warn("Sass is in the process of being separated from Haml,
and will no longer be bundled at all in Haml 3.2.0.
Please install the 'sass' gem if you want to use Sass.
")
        $".delete('sass/version')
        $LOAD_PATH.unshift(scope("vendor/sass/lib"))
      end
      loaded
    end
version_geq(v1, v2) click to toggle source

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/haml/util.rb, line 268
def version_geq(v1, v2)
  version_gt(v1, v2) || !version_gt(v2, v1)
end
version_gt(v1, v2) click to toggle source

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/haml/util.rb, line 239
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 =~ %r^[0-9]+$/
    release2 = p2 =~ %r^[0-9]+$/
    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
windows?() click to toggle source

Whether or not this is running on Windows.

@return [Boolean]

# File lib/haml/util.rb, line 480
def windows?
  RbConfig::CONFIG['host_os'] =~ %rmswin|windows|mingw/
end