Class: CssParser::Parser
- Inherits:
-
Object
- Object
- CssParser::Parser
- Defined in:
- lib/css_parser/parser.rb
Overview
Parser class
All CSS is converted to UTF-8.
When calling Parser#new there are some configuaration options:
absolute_paths
-
Convert relative paths to absolute paths (
href
,src
andurl('')
. Boolean, default isfalse
. import
-
Follow
@import
rules. Boolean, default istrue
. io_exceptions
-
Throw an exception if a link can not be found. Boolean, default is
true
.
Constant Summary collapse
- USER_AGENT =
"Ruby CSS Parser/#{CssParser::VERSION} (http://github.com/alexdunae/css_parser)"
- STRIP_CSS_COMMENTS_RX =
/\/\*.*?\*\//m
- STRIP_HTML_COMMENTS_RX =
/\<\!\-\-|\-\-\>/m
- RE_AT_IMPORT_RULE =
Initial parsing
/\@import\s*(?:url\s*)?(?:\()?(?:\s*)["']?([^'"\s\)]*)["']?\)?([\w\s\,^\]\(\))]*)\)?[;\n]?/
Class Attribute Summary collapse
-
.folded_declaration_cache ⇒ Object
readonly
Returns the value of attribute folded_declaration_cache.
Instance Attribute Summary collapse
-
#loaded_uris ⇒ Object
readonly
Array of CSS files that have been loaded.
Instance Method Summary collapse
-
#add_block!(block, options = {}) ⇒ Object
Add a raw block of CSS.
-
#add_rule!(selectors, declarations, media_types = :all) ⇒ Object
Add a CSS rule by setting the
selectors
,declarations
andmedia_types
. -
#add_rule_set!(ruleset, media_types = :all) ⇒ Object
Add a CssParser RuleSet object.
-
#compact! ⇒ Object
Merge declarations with the same selector.
-
#each_rule_set(media_types = :all) ⇒ Object
Iterate through RuleSet objects.
-
#each_selector(media_types = :all, options = {}) ⇒ Object
Iterate through CSS selectors.
-
#find_by_selector(selector, media_types = :all) ⇒ Object
(also: #[])
Get declarations by selector.
-
#find_rule_sets(selectors, media_types = :all) ⇒ Object
Finds the rule sets that match the given selectors.
-
#initialize(options = {}) ⇒ Parser
constructor
A new instance of Parser.
-
#load_file!(file_name, base_dir = nil, media_types = :all) ⇒ Object
Load a local CSS file.
-
#load_string!(src, base_dir = nil, media_types = :all) ⇒ Object
Load a local CSS string.
-
#load_uri!(uri, options = {}, deprecated = nil) ⇒ Object
Load a remote CSS file.
-
#parse_block_into_rule_sets!(block, options = {}) ⇒ Object
:nodoc:.
-
#rules_by_media_query ⇒ Object
A hash of { :media_query => rule_sets }.
-
#to_s(media_types = :all) ⇒ Object
Output all CSS rules as a single stylesheet.
Constructor Details
#initialize(options = {}) ⇒ Parser
Returns a new instance of Parser.
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# File 'lib/css_parser/parser.rb', line 34 def initialize( = {}) @options = {:absolute_paths => false, :import => true, :io_exceptions => true}.merge() # array of RuleSets @rules = [] @loaded_uris = [] # unprocessed blocks of CSS @blocks = [] reset! end |
Class Attribute Details
.folded_declaration_cache ⇒ Object (readonly)
Returns the value of attribute folded_declaration_cache.
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# File 'lib/css_parser/parser.rb', line 32 def folded_declaration_cache @folded_declaration_cache end |
Instance Attribute Details
#loaded_uris ⇒ Object (readonly)
Array of CSS files that have been loaded.
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# File 'lib/css_parser/parser.rb', line 26 def loaded_uris @loaded_uris end |
Instance Method Details
#add_block!(block, options = {}) ⇒ Object
Add a raw block of CSS.
In order to follow @import rules you must supply either a :base_dir
or :base_uri
option.
Use the :media_types
option to set the media type(s) for this block. Takes an array of symbols.
Use the :only_media_types
option to selectively follow @import rules. Takes an array of symbols.
Example
css = <<-EOT
body { font-size: 10pt }
p { margin: 0px; }
@media screen, print {
body { line-height: 1.2 }
}
EOT
parser = CssParser::Parser.new
parser.add_block!(css)
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# File 'lib/css_parser/parser.rb', line 110 def add_block!(block, = {}) = {:base_uri => nil, :base_dir => nil, :charset => nil, :media_types => :all, :only_media_types => :all}.merge() [:media_types] = [[:media_types]].flatten.collect { |mt| CssParser.sanitize_media_query(mt)} [:only_media_types] = [[:only_media_types]].flatten.collect { |mt| CssParser.sanitize_media_query(mt)} block = cleanup_block(block) if [:base_uri] and @options[:absolute_paths] block = CssParser.convert_uris(block, [:base_uri]) end # Load @imported CSS if @options[:import] block.scan(RE_AT_IMPORT_RULE).each do |import_rule| media_types = [] if media_string = import_rule[-1] media_string.split(/[,]/).each do |t| media_types << CssParser.sanitize_media_query(t) unless t.empty? end else media_types = [:all] end next unless [:only_media_types].include?(:all) or media_types.length < 1 or (media_types & [:only_media_types]).length > 0 import_path = import_rule[0].to_s.gsub(/['"]*/, '').strip if [:base_uri] import_uri = Addressable::URI.parse([:base_uri].to_s) + Addressable::URI.parse(import_path) load_uri!(import_uri, [:base_uri], media_types) elsif [:base_dir] load_file!(import_path, [:base_dir], media_types) end end end # Remove @import declarations block.gsub!(RE_AT_IMPORT_RULE, '') parse_block_into_rule_sets!(block, ) end |
#add_rule!(selectors, declarations, media_types = :all) ⇒ Object
Add a CSS rule by setting the selectors
, declarations
and media_types
.
media_types
can be a symbol or an array of symbols.
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# File 'lib/css_parser/parser.rb', line 155 def add_rule!(selectors, declarations, media_types = :all) rule_set = RuleSet.new(selectors, declarations) add_rule_set!(rule_set, media_types) end |
#add_rule_set!(ruleset, media_types = :all) ⇒ Object
Add a CssParser RuleSet object.
media_types
can be a symbol or an array of symbols.
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# File 'lib/css_parser/parser.rb', line 163 def add_rule_set!(ruleset, media_types = :all) raise ArgumentError unless ruleset.kind_of?(CssParser::RuleSet) media_types = [media_types].flatten.collect { |mt| CssParser.sanitize_media_query(mt)} @rules << {:media_types => media_types, :rules => ruleset} end |
#compact! ⇒ Object
Merge declarations with the same selector.
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# File 'lib/css_parser/parser.rb', line 242 def compact! # :nodoc: compacted = [] compacted end |
#each_rule_set(media_types = :all) ⇒ Object
Iterate through RuleSet objects.
media_types
can be a symbol or an array of symbols.
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# File 'lib/css_parser/parser.rb', line 174 def each_rule_set(media_types = :all) # :yields: rule_set, media_types media_types = [:all] if media_types.nil? media_types = [media_types].flatten.collect { |mt| CssParser.sanitize_media_query(mt)} @rules.each do |block| if media_types.include?(:all) or block[:media_types].any? { |mt| media_types.include?(mt) } yield(block[:rules], block[:media_types]) end end end |
#each_selector(media_types = :all, options = {}) ⇒ Object
Iterate through CSS selectors.
media_types
can be a symbol or an array of symbols. See RuleSet#each_selector for options
.
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# File 'lib/css_parser/parser.rb', line 189 def each_selector(media_types = :all, = {}) # :yields: selectors, declarations, specificity, media_types each_rule_set(media_types) do |rule_set, media_types| rule_set.each_selector() do |selectors, declarations, specificity| yield selectors, declarations, specificity, media_types end end end |
#find_by_selector(selector, media_types = :all) ⇒ Object Also known as: []
Get declarations by selector.
media_types
are optional, and can be a symbol or an array of symbols. The default value is :all
.
Examples
find_by_selector('#content')
=> 'font-size: 13px; line-height: 1.2;'
find_by_selector('#content', [:screen, :handheld])
=> 'font-size: 13px; line-height: 1.2;'
find_by_selector('#content', :print)
=> 'font-size: 11pt; line-height: 1.2;'
Returns an array of declarations.
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# File 'lib/css_parser/parser.rb', line 66 def find_by_selector(selector, media_types = :all) out = [] each_selector(media_types) do |sel, dec, spec| out << dec if sel.strip == selector.strip end out end |
#find_rule_sets(selectors, media_types = :all) ⇒ Object
Finds the rule sets that match the given selectors
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# File 'lib/css_parser/parser.rb', line 76 def find_rule_sets(selectors, media_types = :all) rule_sets = [] selectors.each do |selector| each_rule_set(media_types) do |rule_set, media_type| if !rule_sets.member?(rule_set) && rule_set.selectors.member?(selector) rule_sets << rule_set end end end rule_sets end |
#load_file!(file_name, base_dir = nil, media_types = :all) ⇒ Object
Load a local CSS file.
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# File 'lib/css_parser/parser.rb', line 383 def load_file!(file_name, base_dir = nil, media_types = :all) file_name = File.(file_name, base_dir) return unless File.readable?(file_name) return unless circular_reference_check(file_name) src = IO.read(file_name) base_dir = File.dirname(file_name) add_block!(src, {:media_types => media_types, :base_dir => base_dir}) end |
#load_string!(src, base_dir = nil, media_types = :all) ⇒ Object
Load a local CSS string.
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# File 'lib/css_parser/parser.rb', line 395 def load_string!(src, base_dir = nil, media_types = :all) add_block!(src, {:media_types => media_types, :base_dir => base_dir}) end |
#load_uri!(uri, options = {}, deprecated = nil) ⇒ Object
Load a remote CSS file.
You can also pass in file://test.css
See add_block! for options.
Deprecated: originally accepted three params: ‘uri`, `base_uri` and `media_types`
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# File 'lib/css_parser/parser.rb', line 356 def load_uri!(uri, = {}, deprecated = nil) uri = Addressable::URI.parse(uri) unless uri.respond_to? :scheme #base_uri = nil, media_types = :all, options = {} opts = {:base_uri => nil, :media_types => :all} if .is_a? Hash opts.merge!() else opts[:base_uri] = if .is_a? String opts[:media_types] = deprecated if deprecated end if uri.scheme == 'file' or uri.scheme.nil? uri.path = File.(uri.path) uri.scheme = 'file' end opts[:base_uri] = uri if opts[:base_uri].nil? src, charset = read_remote_file(uri) if src add_block!(src, opts) end end |
#parse_block_into_rule_sets!(block, options = {}) ⇒ Object
:nodoc:
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# File 'lib/css_parser/parser.rb', line 248 def parse_block_into_rule_sets!(block, = {}) # :nodoc: current_media_queries = [:all] if [:media_types] current_media_queries = [:media_types].flatten.collect { |mt| CssParser.sanitize_media_query(mt)} end in_declarations = 0 block_depth = 0 in_charset = false # @charset is ignored for now in_string = false in_at_media_rule = false in_media_block = false current_selectors = '' current_media_query = '' current_declarations = '' block.scan(/([\\]?[{}\s"]|(.[^\s"{}\\]*))/).each do |matches| token = matches[0] if token =~ /\A"/ # found un-escaped double quote in_string = !in_string end if in_declarations > 0 # too deep, malformed declaration block if in_declarations > 1 in_declarations -= 1 if token =~ /\}/ next end if token =~ /\{/ in_declarations += 1 next end current_declarations += token if token =~ /\}/ and not in_string current_declarations.gsub!(/\}[\s]*$/, '') in_declarations -= 1 unless current_declarations.strip.empty? add_rule!(current_selectors, current_declarations, current_media_queries) end current_selectors = '' current_declarations = '' end elsif token =~ /@media/i # found '@media', reset current media_types in_at_media_rule = true current_media_queries = [] elsif in_at_media_rule if token =~ /\{/ block_depth = block_depth + 1 in_at_media_rule = false in_media_block = true current_media_queries << CssParser.sanitize_media_query(current_media_query) current_media_query = '' elsif token =~ /[,]/ # new media query begins token.gsub!(/[,]/, ' ') current_media_query += token.strip + ' ' current_media_queries << CssParser.sanitize_media_query(current_media_query) current_media_query = '' else current_media_query += token.strip + ' ' end elsif in_charset or token =~ /@charset/i # iterate until we are out of the charset declaration in_charset = (token =~ /;/ ? false : true) else if token =~ /\}/ and not in_string block_depth = block_depth - 1 # reset the current media query scope if in_media_block current_media_queries = [:all] in_media_block = false end else if token =~ /\{/ and not in_string current_selectors.gsub!(/^[\s]*/, '') current_selectors.gsub!(/[\s]*$/, '') in_declarations += 1 else current_selectors += token end end end end # check for unclosed braces if in_declarations > 0 add_rule!(current_selectors, current_declarations, current_media_queries) end end |
#rules_by_media_query ⇒ Object
A hash of { :media_query => rule_sets }
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# File 'lib/css_parser/parser.rb', line 227 def rules_by_media_query rules_by_media = {} @rules.each do |block| block[:media_types].each do |mt| unless rules_by_media.has_key?(mt) rules_by_media[mt] = [] end rules_by_media[mt] << block[:rules] end end rules_by_media end |
#to_s(media_types = :all) ⇒ Object
Output all CSS rules as a single stylesheet.
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# File 'lib/css_parser/parser.rb', line 198 def to_s(media_types = :all) out = '' styles_by_media_types = {} each_selector(media_types) do |selectors, declarations, specificity, media_types| media_types.each do |media_type| styles_by_media_types[media_type] ||= [] styles_by_media_types[media_type] << [selectors, declarations] end end styles_by_media_types.each_pair do |media_type, media_styles| media_block = (media_type != :all) out += "@media #{media_type} {\n" if media_block media_styles.each do |media_style| if media_block out += " #{media_style[0]} {\n #{media_style[1]}\n }\n" else out += "#{media_style[0]} {\n#{media_style[1]}\n}\n" end end out += "}\n" if media_block end out end |