--- /dev/null
+require_relative 'char_string_scanner'
+require 'bootstrap-sass/version'
+
+# This is the script used to automatically convert all of twbs/bootstrap LESS to Sass.
+#
+# Most differences are fixed by regexps and other forms of string substitution.
+# There are Bootstrap-specific workarounds for the lack of parent selectors, recursion, mixin namespaces, extend within @media, etc in Sass 3.2.
+class Converter
+ module LessConversion
+ # Some regexps for matching bits of SCSS:
+ SELECTOR_CHAR = '\[\]$\w\-{}#,.:&>@'
+ # 1 selector (the part before the {)
+ SELECTOR_RE = /[#{SELECTOR_CHAR}]+[#{SELECTOR_CHAR}\s]*/
+ # 1 // comment
+ COMMENT_RE = %r((?:^[ \t]*//[^\n]*\n))
+ # 1 {, except when part of @{ and #{
+ RULE_OPEN_BRACE_RE = /(?<![@#\$])\{/
+ # same as the one above, but in reverse (on a reversed string)
+ RULE_OPEN_BRACE_RE_REVERSE = /\{(?![@#\$])/
+ # match closed brace, except when \w precedes }, or when }[.'"]. a heurestic to exclude } that are not selector body close }
+ RULE_CLOSE_BRACE_RE = /(?<!\w)\}(?![.'"])/
+ RULE_CLOSE_BRACE_RE_REVERSE = /(?<![.'"])\}(?!\w)/
+ # match any brace that opens or closes a properties body
+ BRACE_RE = /#{RULE_OPEN_BRACE_RE}|#{RULE_CLOSE_BRACE_RE}/m
+ BRACE_RE_REVERSE = /#{RULE_OPEN_BRACE_RE_REVERSE}|#{RULE_CLOSE_BRACE_RE_REVERSE}/m
+ # valid characters in mixin definitions
+ SCSS_MIXIN_DEF_ARGS_RE = /[\w\-,\s$:#%()]*/
+ LESS_MIXIN_DEF_ARGS_RE = /[\w\-,;.\s@:#%()]*/
+
+ # These mixins will get vararg definitions in SCSS (not supported by LESS):
+ NESTED_MIXINS = {'#gradient' => 'gradient'}
+
+ # These mixins will get vararg definitions in SCSS (not supported by LESS):
+ VARARG_MIXINS = %w(
+ scale transition transition-duration transition-property transition-transform box-shadow
+ )
+
+ # A list of classes that will be extracted into mixins
+ # Only the top-level selectors of form .CLASS { ... } are extracted. CLASS must not be used in any other rule definition.
+ # This is a work-around for libsass @extend issues
+ CLASSES_TO_MIXINS = %w(
+ list-unstyled form-inline
+ )
+
+ # Convert a snippet of bootstrap LESS to Scss
+ def convert_less(less)
+ less = convert_to_scss(less)
+ less = yield(less) if block_given?
+ less
+ end
+
+ def shared_mixins
+ @shared_mixins ||= begin
+ log_status ' Reading shared mixins from mixins.less'
+ CLASSES_TO_MIXINS + read_mixins(read_files('less', bootstrap_less_files.grep(/mixins\//)).values.join("\n"),
+ nested: NESTED_MIXINS)
+ end
+ end
+
+ def process_stylesheet_assets
+ log_status 'Processing stylesheets...'
+ files = read_files('less', bootstrap_less_files)
+ save_to = @save_to[:scss]
+
+ log_status ' Converting LESS files to Scss:'
+ files.each do |name, file|
+ log_processing name
+ # apply common conversions
+ file = convert_less(file)
+ if name.start_with?('mixins/')
+ file = varargify_mixin_definitions(file, *VARARG_MIXINS)
+ %w(responsive-(in)?visibility input-size text-emphasis-variant bg-variant).each do |mixin|
+ file = parameterize_mixin_parent_selector file, mixin if file =~ /#{mixin}/
+ end
+ NESTED_MIXINS.each do |sel, name|
+ file = flatten_mixins(file, sel, name) if /#{Regexp.escape(sel)}/ =~ file
+ end
+ file = replace_all file, /(?<=[.-])\$state/, '#{$state}' if file =~ /[.-]\$state/
+ end
+ case name
+ when 'mixins/buttons.less'
+ file = replace_all file, /(\.dropdown-toggle)&/, '&\1'
+ when 'mixins/list-group.less'
+ file = replace_rules(file, ' .list-group-item-') { |rule| extract_nested_rule rule, 'a&' }
+ when 'mixins/gradients.less'
+ file = replace_ms_filters(file)
+ file = deinterpolate_vararg_mixins(file)
+ when 'mixins/vendor-prefixes.less'
+ # remove second scale mixins as this is handled via vararg in the first one
+ file = replace_rules(file, Regexp.escape('@mixin scale($ratioX, $ratioY...)')) { '' }
+ when 'mixins/grid-framework.less'
+ file = convert_grid_mixins file
+ when 'component-animations.less'
+ file = extract_nested_rule file, "#{SELECTOR_RE}&\\.in"
+ when 'responsive-utilities.less'
+ file = apply_mixin_parent_selector file, '\.(?:visible|hidden)'
+ when 'variables.less'
+ file = insert_default_vars(file)
+ file = ['$bootstrap-sass-asset-helper: false !default;', file].join("\n")
+ file = replace_all file, %r{(\$icon-font-path): \s*"(.*)" (!default);}, "\n" + unindent(<<-SCSS, 14)
+ // [converter] If $bootstrap-sass-asset-helper if used, provide path relative to the assets load path.
+ // [converter] This is because some asset helpers, such as Sprockets, do not work with file-relative paths.
+ \\1: if($bootstrap-sass-asset-helper, "bootstrap/", "\\2bootstrap/") \\3;
+ SCSS
+ when 'breadcrumbs.less'
+ file = replace_all file, /(.*)(\\00a0)/, unindent(<<-SCSS, 8) + "\\1\#{$nbsp}"
+ // [converter] Workaround for https://github.com/sass/libsass/issues/1115
+ $nbsp: "\\2";
+ SCSS
+ when 'close.less'
+ # extract .close { button& {...} } rule
+ file = extract_nested_rule file, 'button&'
+ when 'dropdowns.less'
+ file = replace_all file, /@extend \.dropdown-menu-right;/, 'right: 0; left: auto;'
+ file = replace_all file, /@extend \.dropdown-menu-left;/, 'left: 0; right: auto;'
+ when 'forms.less'
+ file = extract_nested_rule file, 'textarea&'
+ file = apply_mixin_parent_selector(file, '\.input-(?:sm|lg)')
+ file = replace_rules file, /\.form-group-(?:sm|lg)/ do |rule|
+ apply_mixin_parent_selector rule, '.form-control'
+ end
+ when 'navbar.less'
+ file = replace_all file, /(\s*)\.navbar-(right|left)\s*\{\s*@extend\s*\.pull-(right|left);\s*/, "\\1.navbar-\\2 {\\1 float: \\2 !important;\\1"
+ when 'tables.less'
+ file = replace_all file, /(@include\s*table-row-variant\()(\w+)/, "\\1'\\2'"
+ when 'thumbnails.less', 'labels.less', 'badges.less', 'buttons.less'
+ file = extract_nested_rule file, 'a&'
+ when 'glyphicons.less'
+ file = replace_rules(file, /\s*@font-face/) { |rule|
+ rule = replace_all rule, /(\$icon-font(?:-\w+)+)/, '#{\1}'
+ replace_asset_url rule, :font
+ }
+ when 'type.less'
+ file = apply_mixin_parent_selector(file, '\.(text|bg)-(success|primary|info|warning|danger)')
+ # .bg-primary will not get patched automatically as it includes an additional rule. fudge for now
+ file = replace_all(file, " @include bg-variant($brand-primary);\n}", "}\n@include bg-variant('.bg-primary', $brand-primary);")
+ end
+
+ path = File.join save_to, name.sub(/\.less$/, '.scss')
+ path = File.join File.dirname(path), '_' + File.basename(path)
+ save_file(path, file)
+ log_processed File.basename(path)
+ end
+
+ # move bootstrap/_bootstrap.scss to _bootstrap.scss adjusting import paths
+ main_from = "#{save_to}/_bootstrap.scss"
+ main_to = File.expand_path("#{save_to}/../_bootstrap.scss")
+ save_file main_to, File.read(main_from).gsub(/ "/, ' "bootstrap/')
+ File.delete(main_from)
+
+ # generate variables template
+ save_file 'templates/project/_bootstrap-variables.sass',
+ "// Override Bootstrap variables here (defaults from bootstrap-sass v#{Bootstrap::VERSION}):\n\n" +
+ File.read("#{save_to}/_variables.scss").lines[1..-1].join.gsub(/^(?=\$)/, '// ').gsub(/ !default;/, '')
+ end
+
+ def bootstrap_less_files
+ @bootstrap_less_files ||= get_paths_by_type('less', /\.less$/)
+ end
+
+ # apply general less to scss conversion
+ def convert_to_scss(file)
+ # get local mixin names before converting the definitions
+ mixins = shared_mixins + read_mixins(file)
+ file = replace_vars(file)
+ file = replace_mixin_definitions(file)
+ file = replace_mixins(file, mixins)
+ file = extract_mixins_from_selectors(file, CLASSES_TO_MIXINS.inject({}) { |h, cl| h.update(".#{cl}" => cl) })
+ file = replace_spin(file)
+ file = replace_fadein(file)
+ file = replace_image_urls(file)
+ file = replace_escaping(file)
+ file = convert_less_ampersand(file)
+ file = deinterpolate_vararg_mixins(file)
+ file = replace_calculation_semantics(file)
+ file = replace_file_imports(file)
+ file = wrap_at_groups_with_at_root(file)
+ file
+ end
+
+ def wrap_at_groups_with_at_root(file)
+ replace_rules(file, /@(?:font-face|-ms-viewport)/) { |rule, _pos|
+ %Q(@at-root {\n#{indent rule, 2}\n})
+ }
+ end
+
+ def sass_fn_exists(fn)
+ %Q{(#{fn}("") != unquote('#{fn}("")'))}
+ end
+
+ def replace_asset_url(rule, type)
+ replace_all rule, /url\((.*?)\)/, "url(if($bootstrap-sass-asset-helper, twbs-#{type}-path(\\1), \\1))"
+ end
+
+ # convert recursively evaluated selector $list to @for loop
+ def mixin_all_grid_columns(css, selector: raise('pass class'), from: 1, to: raise('pass to'))
+ mxn_def = css.each_line.first.strip
+ # inject local variables as default arguments
+ # this is to avoid overwriting outer variables with the same name with Sass <= 3.3
+ # see also: https://github.com/twbs/bootstrap-sass/issues/636
+ locals = <<-SASS.strip
+ $i: #{from}, $list: "#{selector}"
+ SASS
+ mxn_def.sub!(/(\(?)(\)\s*\{)/) { "#{$1}#{', ' if $1.empty?}#{locals}#{$2}" }
+ step_body = (css =~ /\$list \{\n(.*?)\n[ ]*\}/m) && $1
+<<-SASS
+// [converter] This is defined recursively in LESS, but Sass supports real loops
+#{mxn_def}
+ @for $i from (#{from} + 1) through #{to} {
+ $list: "\#{$list}, #{selector}";
+ }
+ \#{$list} {
+#{unindent step_body, 2}
+ }
+}
+SASS
+ end
+
+ # convert grid mixins LESS when => Sass @if
+ def convert_grid_mixins(file)
+ file = replace_rules file, /@mixin make-grid-columns/, comments: false do |css, pos|
+ mixin_all_grid_columns css, selector: '.col-xs-#{$i}, .col-sm-#{$i}, .col-md-#{$i}, .col-lg-#{$i}', to: '$grid-columns'
+ end
+ file = replace_rules file, /@mixin float-grid-columns/, comments: false do |css, pos|
+ mixin_all_grid_columns css, selector: '.col-#{$class}-#{$i}', to: '$grid-columns'
+ end
+ file = replace_rules file, /@mixin calc-grid-column/ do |css|
+ css = indent css.gsub(/.*when (.*?) {/, '@if \1 {').gsub(/(\$[\w-]+)\s+=\s+(\w+)/, '\1 == \2').gsub(/(?<=-)(\$[a-z]+)/, '#{\1}')
+ if css =~ /== width/
+ css = "@mixin calc-grid-column($index, $class, $type) {\n#{css}"
+ elsif css =~ /== offset/
+ css += "\n}"
+ end
+ css
+ end
+ file = replace_rules file, /@mixin loop-grid-columns/ do |css|
+ unindent <<-SASS, 8
+ // [converter] This is defined recursively in LESS, but Sass supports real loops
+ @mixin loop-grid-columns($columns, $class, $type) {
+ @for $i from 0 through $columns {
+ @include calc-grid-column($i, $class, $type);
+ }
+ }
+ SASS
+ end
+ file
+ end
+
+
+ # We need to keep a list of shared mixin names in order to convert the includes correctly
+ # Before doing any processing we read shared mixins from a file
+ # If a mixin is nested, it gets prefixed in the list (e.g. #gradient > .horizontal to 'gradient-horizontal')
+ def read_mixins(mixins_file, nested: {})
+ mixins = get_mixin_names(mixins_file, silent: true)
+ nested.each do |selector, prefix|
+ # we use replace_rules without replacing anything just to use the parsing algorithm
+ replace_rules(mixins_file, selector) { |rule|
+ mixins += get_mixin_names(unindent(unwrap_rule_block(rule)), silent: true).map { |name| "#{prefix}-#{name}" }
+ rule
+ }
+ end
+ mixins.uniq!
+ mixins.sort!
+ log_file_info "mixins: #{mixins * ', '}" unless mixins.empty?
+ mixins
+ end
+
+ def get_mixin_names(file, opts = {})
+ names = get_css_selectors(file).join("\n" * 2).scan(/^\.([\w-]+)\(#{LESS_MIXIN_DEF_ARGS_RE}\)(?: when.*?)?[ ]*\{/).map(&:first).uniq.sort
+ log_file_info "mixin defs: #{names * ', '}" unless opts[:silent] || names.empty?
+ names
+ end
+
+ # margin: a -b
+ # LESS: sets 2 values
+ # Sass: sets 1 value (a-b)
+ # This wraps a and -b so they evaluates to 2 values in Sass
+ def replace_calculation_semantics(file)
+ # split_prop_val.call('(@navbar-padding-vertical / 2) -@navbar-padding-horizontal')
+ # #=> ["(navbar-padding-vertical / 2)", "-navbar-padding-horizontal"]
+ split_prop_val = proc { |val|
+ s = CharStringScanner.new(val)
+ r = []
+ buff = ''
+ d = 0
+ prop_char = %r([\$\w\-/\*\+%!])
+ while (token = s.scan_next(/([\)\(]|\s+|#{prop_char}+)/))
+ buff << token
+ case token
+ when '('
+ d += 1
+ when ')'
+ d -= 1
+ if d == 0
+ r << buff
+ buff = ''
+ end
+ when /\s/
+ if d == 0 && !buff.strip.empty?
+ r << buff
+ buff = ''
+ end
+ end
+ end
+ r << buff unless buff.empty?
+ r.map(&:strip)
+ }
+
+ replace_rules file do |rule|
+ replace_properties rule do |props|
+ props.gsub /(?<!\w)([\w-]+):(.*?);/ do |m|
+ prop, vals = $1, split_prop_val.call($2)
+ next m unless vals.length >= 2 && vals.any? { |v| v =~ /^[\+\-]\$/ }
+ transformed = vals.map { |v| v.strip =~ %r(^\(.*\)$) ? v : "(#{v})" }
+ log_transform "property #{prop}: #{transformed * ' '}", from: 'wrap_calculation'
+ "#{prop}: #{transformed * ' '};"
+ end
+ end
+ end
+ end
+
+ # @import "file.less" to "#{target_path}file;"
+ def replace_file_imports(less, target_path = '')
+ less.gsub %r([@\$]import ["|']([\w\-/]+).less["|'];),
+ %Q(@import "#{target_path}\\1";)
+ end
+
+ def replace_all(file, regex, replacement = nil, &block)
+ log_transform regex, replacement
+ new_file = file.gsub(regex, replacement, &block)
+ raise "replace_all #{regex}, #{replacement} NO MATCH" if file == new_file
+ new_file
+ end
+
+ # @mixin a() { tr& { color:white } }
+ # to:
+ # @mixin a($parent) { tr#{$parent} { color: white } }
+ def parameterize_mixin_parent_selector(file, rule_sel)
+ log_transform rule_sel
+ param = '$parent'
+ replace_rules(file, '^\s*@mixin\s*' + rule_sel) do |mxn_css|
+ mxn_css.sub! /(?=@mixin)/, "// [converter] $parent hack\n"
+ # insert param into mixin def
+ mxn_css.sub!(/(@mixin [\w-]+)\(([\$\w\-,\s]*)\)/) { "#{$1}(#{param}#{', ' if $2 && !$2.empty?}#{$2})" }
+ # wrap properties in #{$parent} { ... }
+ replace_properties(mxn_css) { |props|
+ next props if props.strip.empty?
+ spacer = ' ' * indent_width(props)
+ "#{spacer}\#{#{param}} {\n#{indent(props.sub(/\s+\z/, ''), 2)}\n#{spacer}}"
+ }
+ # change nested& rules to nested#{$parent}
+ replace_rules(mxn_css, /.*&[ ,:]/) { |rule| replace_in_selector rule, /&/, "\#{#{param}}" }
+ end
+ end
+
+ # extracts rule immediately after it's parent, and adjust the selector
+ # .x { textarea& { ... }}
+ # to:
+ # .x { ... }
+ # textarea.x { ... }
+ def extract_nested_rule(file, selector, new_selector = nil)
+ matches = []
+ # first find the rules, and remove them
+ file = replace_rules(file, "\s*#{selector}", comments: true) { |rule, pos, css|
+ new_sel = new_selector || "#{get_selector(rule).gsub(/&/, selector_for_pos(css, pos.begin))}"
+ matches << [rule, pos, new_sel]
+ indent "// [converter] extracted #{get_selector(rule)} to #{new_sel}".tr("\n", ' ').squeeze(' '), indent_width(rule)
+ }
+ raise "extract_nested_rule: no such selector: #{selector}" if matches.empty?
+ # replace rule selector with new_selector
+ matches.each do |m|
+ m[0].sub! /(#{COMMENT_RE}*)^(\s*).*?(\s*){/m, "\\1\\2#{m[2]}\\3{"
+ log_transform selector, m[2]
+ end
+ replace_substrings_at file,
+ matches.map { |_, pos| close_brace_pos(file, pos.begin, 1) + 1 },
+ matches.map { |rule, _| "\n\n" + unindent(rule) }
+ end
+
+ # .visible-sm { @include responsive-visibility() }
+ # to:
+ # @include responsive-visibility('.visible-sm')
+ def apply_mixin_parent_selector(file, rule_sel)
+ log_transform rule_sel
+ replace_rules file, '\s*' + rule_sel, comments: false do |rule, rule_pos, css|
+ body = unwrap_rule_block(rule.dup).strip
+ next rule unless body =~ /^@include \w+/m || body =~ /^@media/ && body =~ /\{\s*@include/
+ rule =~ /(#{COMMENT_RE}*)([#{SELECTOR_CHAR}\s*]+?)#{RULE_OPEN_BRACE_RE}/
+ cmt, sel = $1, $2.strip
+ # take one up selector chain if this is an &. selector
+ if sel.start_with?('&')
+ parent_sel = selector_for_pos(css, rule_pos.begin)
+ sel = parent_sel + sel[1..-1]
+ end
+ # unwrap, and replace @include
+ unindent unwrap_rule_block(rule).gsub(/(@include [\w-]+)\(?([\$\w\-,\s]*)\)?/) {
+ name, args = $1, $2
+ sel.gsub(/\s+/, ' ').split(/,\s*/ ).map { |sel_part|
+ "#{cmt}#{name}('#{sel_part}'#{', ' if args && !args.empty?}#{args})"
+ }.join(";\n")
+ }
+ end
+ end
+
+ # #gradient > { @mixin horizontal ... }
+ # to:
+ # @mixin gradient-horizontal
+ def flatten_mixins(file, container, prefix)
+ log_transform container, prefix
+ replace_rules file, Regexp.escape(container) do |mixins_css|
+ unindent unwrap_rule_block(mixins_css).gsub(/@mixin\s*([\w-]+)/, "@mixin #{prefix}-\\1")
+ end
+ end
+
+ # .btn { ... } -> @mixin btn { ... }; .btn { @include btn }
+ def extract_mixins_from_selectors(file, selectors_to_mixins)
+ selectors_to_mixins.each do |selector, mixin|
+ file = replace_rules file, Regexp.escape(selector), prefix: false do |selector_css|
+ log_transform "#{selector} { ... } -> @mixin #{mixin} { ... }; #{selector} { @include #{mixin} } ", from: 'extract_mixins_from_selectors'
+ <<-SCSS
+// [converter] extracted from `#{selector}` for libsass compatibility
+@mixin #{mixin} {#{unwrap_rule_block(selector_css)}
+}
+// [converter] extracted as `@mixin #{mixin}` for libsass compatibility
+#{selector} {
+ @include #{mixin};
+}
+ SCSS
+ end
+ end
+ file
+ end
+
+ # @include and @extend from LESS:
+ # .mixin() -> @include mixin()
+ # #scope > .mixin() -> @include scope-mixin()
+ # &:extend(.mixin all) -> @include mixin()
+ def replace_mixins(less, mixin_names)
+ mixin_pattern = /(?<=^|\s)((?:[#|\.][\w-]+\s*>\s*)*)\.([\w-]+)\((.*)\)(?!\s\{)/
+
+ less = less.gsub(mixin_pattern) do |_|
+ scope, name, args = $1, $2, $3
+ scope = scope.scan(/[\w-]+/).join('-') + '-' unless scope.empty?
+ args = "(#{args.tr(';', ',')})" unless args.empty?
+ if name && mixin_names.include?("#{scope}#{name}")
+ "@include #{scope}#{name}#{args}"
+ else
+ "@extend .#{scope}#{name}"
+ end
+ end
+
+ less.gsub /&:extend\((#{SELECTOR_RE})(?: all)?\)/ do
+ selector = $1
+ selector =~ /\.([\w-]+)/
+ mixin = $1
+ if mixin && mixin_names.include?(mixin)
+ "@include #{mixin}"
+ else
+ "@extend #{selector}"
+ end
+ end
+ end
+
+ # change Microsoft filters to Sass calling convention
+ def replace_ms_filters(file)
+ log_transform
+ file.gsub(
+ /filter: e\(%\("progid:DXImageTransform.Microsoft.gradient\(startColorstr='%d', endColorstr='%d', GradientType=(\d)\)",argb\(([\-$\w]+)\),argb\(([\-$\w]+)\)\)\);/,
+ %Q(filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='\#{ie-hex-str(\\2)}', endColorstr='\#{ie-hex-str(\\3)}', GradientType=\\1);)
+ )
+ end
+
+ # unwraps topmost rule block
+ # #sel { a: b; }
+ # to:
+ # a: b;
+ def unwrap_rule_block(css)
+ css[(css =~ RULE_OPEN_BRACE_RE) + 1..-1].sub(/\n?}\s*\z/m, '')
+ end
+
+ def replace_mixin_definitions(less)
+ less.gsub(/^(\s*)\.([\w-]+\(.*\))(\s*\{)/) { |match|
+ "#{$1}@mixin #{$2.tr(';', ',')}#{$3}".sub(/,\)/, ')')
+ }
+ end
+
+ def replace_vars(less)
+ less = less.dup
+ # skip header comment
+ less =~ %r(\A/\*(.*?)\*/)m
+ from = $~ ? $~.to_s.length : 0
+ less[from..-1] = less[from..-1].
+ gsub(/(?!@mixin|@media|@page|@keyframes|@font-face|@-\w)@/, '$').
+ # variables that would be ignored by gsub above: e.g. @page-header-border-color
+ gsub(/@(page[\w-]+)/, '$\1')
+ less
+ end
+
+ def replace_spin(less)
+ less.gsub(/(?![\-$@.])spin(?!-)/, 'adjust-hue')
+ end
+
+ def replace_fadein(less)
+ less.gsub(/(?![\-$@.])fadein\((.*?),\s*(.*?)%\)/) { "fade_in(#{$1}, #{$2.to_i / 100.0})" }
+ end
+
+ def replace_image_urls(less)
+ less.gsub(/background-image: url\("?(.*?)"?\);/) { |s| replace_asset_url s, :image }
+ end
+
+ def replace_escaping(less)
+ less = less.gsub(/~"([^"]+)"/, '\1').gsub(/~'([^']+)'/, '\1') # Get rid of ~"" escape
+ less.gsub!(/\$\{([^}]+)\}/, '$\1') # Get rid of @{} escape
+ less.gsub!(/"([^"\n]*)(\$[\w\-]+)([^"\n]*)"/, '"\1#{\2}\3"') # interpolate variable in string, e.g. url("$file-1x") => url("#{$file-1x}")
+ less.gsub(/(\W)e\(%\("?([^"]*)"?\)\)/, '\1\2') # Get rid of e(%("")) escape
+ end
+
+ def insert_default_vars(scss)
+ log_transform
+ scss.gsub(/^(\$.+);/, '\1 !default;')
+ end
+
+ # Converts &-
+ def convert_less_ampersand(less)
+ regx = /^\.badge\s*\{[\s\/\w\(\)]+(&{1}-{1})\w.*?^}$/m
+
+ tmp = ''
+ less.scan(/^(\s*&)(-[\w\[\]]+\s*\{.+})$/) do |ampersand, css|
+ tmp << ".badge#{css}\n"
+ end
+
+ less.gsub(regx, tmp)
+ end
+
+ # unindent by n spaces
+ def unindent(txt, n = 2)
+ txt.gsub /^[ ]{#{n}}/, ''
+ end
+
+ # indent by n spaces
+ def indent(txt, n = 2)
+ spaces = ' ' * n
+ txt.gsub /^/, spaces
+ end
+
+ # get indent length from the first line of txt
+ def indent_width(txt)
+ txt.match(/\A\s*/).to_s.length
+ end
+
+ # @mixin transition($transition) {
+ # to:
+ # @mixin transition($transition...) {
+ def varargify_mixin_definitions(scss, *mixins)
+ scss = scss.dup
+ replaced = []
+ mixins.each do |mixin|
+ if scss.gsub! /(@mixin\s*#{Regexp.quote(mixin)})\((#{SCSS_MIXIN_DEF_ARGS_RE})\)/, '\1(\2...)'
+ replaced << mixin
+ end
+ end
+ log_transform *replaced unless replaced.empty?
+ scss
+ end
+
+ # @include transition(#{border-color ease-in-out .15s, box-shadow ease-in-out .15s})
+ # to
+ # @include transition(border-color ease-in-out .15s, box-shadow ease-in-out .15s)
+ def deinterpolate_vararg_mixins(scss)
+ scss = scss.dup
+ VARARG_MIXINS.each do |mixin|
+ if scss.gsub! /(@include\s*#{Regexp.quote(mixin)})\(\s*\#\{([^}]+)\}\s*\)/, '\1(\2)'
+ log_transform mixin
+ end
+ end
+ scss
+ end
+
+ # get full selector for rule_block
+ def get_selector(rule_block)
+ sel = /^\s*(#{SELECTOR_RE}?)\s*\{/.match(rule_block) && $1 && $1.strip
+ sel.sub /\s*\{\n\s.*/m, ''
+ end
+
+ # replace CSS rule blocks matching rule_prefix with yield(rule_block, rule_pos)
+ # will also include immediately preceding comments in rule_block
+ #
+ # option :comments -- include immediately preceding comments in rule_block
+ #
+ # replace_rules(".a{ \n .b{} }", '.b') { |rule, pos| ">#{rule}<" } #=> ".a{ \n >.b{}< }"
+ def replace_rules(less, selector = SELECTOR_RE, options = {}, &block)
+ options = {prefix: true, comments: true}.merge(options || {})
+ less = less.dup
+ s = CharStringScanner.new(less)
+ rule_re = if options[:prefix]
+ /(?:#{selector}[#{SELECTOR_CHAR})=(\s]*?#{RULE_OPEN_BRACE_RE})/
+ else
+ /#{selector}[\s]*#{RULE_OPEN_BRACE_RE}/
+ end
+ rule_start_re = if options[:comments]
+ /(?:#{COMMENT_RE}*)^#{rule_re}/
+ else
+ /^#{rule_re}/
+ end
+
+ positions = []
+ while (rule_start = s.scan_next(rule_start_re))
+ pos = s.pos
+ positions << (pos - rule_start.length..close_brace_pos(less, pos - 1))
+ end
+ replace_substrings_at(less, positions, &block)
+ less
+ end
+
+ # Get a all top-level selectors (with {)
+ def get_css_selectors(css, opts = {})
+ s = CharStringScanner.new(css)
+ selectors = []
+ while s.scan_next(RULE_OPEN_BRACE_RE)
+ brace_pos = s.pos
+ def_pos = css_def_pos(css, brace_pos+1, -1)
+ sel = css[def_pos.begin..brace_pos - 1].dup
+ sel.strip! if opts[:strip]
+ selectors << sel
+ sel.dup.strip
+ s.pos = close_brace_pos(css, brace_pos, 1) + 1
+ end
+ selectors
+ end
+
+ # replace in the top-level selector
+ # replace_in_selector('a {a: {a: a} } a {}', /a/, 'b') => 'b {a: {a: a} } b {}'
+ def replace_in_selector(css, pattern, sub)
+ # scan for selector positions in css
+ s = CharStringScanner.new(css)
+ prev_pos = 0
+ sel_pos = []
+ while (brace = s.scan_next(RULE_OPEN_BRACE_RE))
+ pos = s.pos
+ sel_pos << (prev_pos .. pos - 1)
+ s.pos = close_brace_pos(css, s.pos - 1) + 1
+ prev_pos = pos
+ end
+ replace_substrings_at(css, sel_pos) { |s| s.gsub(pattern, sub) }
+ end
+
+
+ # replace first level properties in the css with yields
+ # replace_properties("a { color: white }") { |props| props.gsub 'white', 'red' }
+ def replace_properties(css, &block)
+ s = CharStringScanner.new(css)
+ s.skip_until /#{RULE_OPEN_BRACE_RE}\n?/
+ from = s.pos
+ m = s.scan_next(/\s*#{SELECTOR_RE}#{RULE_OPEN_BRACE_RE}/) || s.scan_next(/\s*#{RULE_CLOSE_BRACE_RE}/)
+ to = s.pos - m.length - 1
+ replace_substrings_at css, [(from .. to)], &block
+ end
+
+
+ # immediate selector of css at pos
+ def selector_for_pos(css, pos, depth = -1)
+ css[css_def_pos(css, pos, depth)].dup.strip
+ end
+
+ # get the pos of css def at pos (search backwards)
+ def css_def_pos(css, pos, depth = -1)
+ to = open_brace_pos(css, pos, depth)
+ prev_def = to - (css[0..to].reverse.index(RULE_CLOSE_BRACE_RE_REVERSE) || to) + 1
+ from = prev_def + 1 + (css[prev_def + 1..-1] =~ %r(^\s*[^\s/]))
+ (from..to - 1)
+ end
+
+ # next matching brace for brace at from
+ def close_brace_pos(css, from, depth = 0)
+ s = CharStringScanner.new(css[from..-1])
+ while (b = s.scan_next(BRACE_RE))
+ depth += (b == '}' ? -1 : +1)
+ break if depth.zero?
+ end
+ raise "match not found for {" unless depth.zero?
+ from + s.pos - 1
+ end
+
+ # opening brace position from +from+ (search backwards)
+ def open_brace_pos(css, from, depth = 0)
+ s = CharStringScanner.new(css[0..from].reverse)
+ while (b = s.scan_next(BRACE_RE_REVERSE))
+ depth += (b == '{' ? +1 : -1)
+ break if depth.zero?
+ end
+ raise "matching { brace not found" unless depth.zero?
+ from - s.pos + 1
+ end
+
+ # insert substitutions into text at positions (Range or Fixnum)
+ # substitutions can be passed as array or as yields from the &block called with |substring, position, text|
+ # position is a range (begin..end)
+ def replace_substrings_at(text, positions, replacements = nil, &block)
+ offset = 0
+ positions.each_with_index do |p, i|
+ p = (p...p) if p.is_a?(Fixnum)
+ from = p.begin + offset
+ to = p.end + offset
+ p = p.exclude_end? ? (from...to) : (from..to)
+ # block returns the substitution, e.g.: { |text, pos| text[pos].upcase }
+ r = replacements ? replacements[i] : block.call(text[p], p, text)
+ text[p] = r
+ # add the change in length to offset
+ offset += r.size - (p.end - p.begin + (p.exclude_end? ? 0 : 1))
+ end
+ text
+ end
+ end
+end
projects / yaffs-website / blobdiff