gems.premailer-1.8.4.lib.premailer.adapter.nokogiri.rb Maven / Gradle / Ivy
require 'nokogiri'
class Premailer
module Adapter
# Nokogiri adapter
module Nokogiri
# Merge CSS into the HTML document.
#
# @return [String] an HTML.
def to_inline_css
doc = @processed_doc
@unmergable_rules = CssParser::Parser.new
# Give all styles already in style attributes a specificity of 1000
# per http://www.w3.org/TR/CSS21/cascade.html#specificity
doc.search("*[@style]").each do |el|
el['style'] = '[SPEC=1000[' + el.attributes['style'] + ']]'
end
# Iterate through the rules and merge them into the HTML
@css_parser.each_selector(:all) do |selector, declaration, specificity, media_types|
# Save un-mergable rules separately
selector.gsub!(/:link([\s]*)+/i) {|m| $1 }
# Convert element names to lower case
selector.gsub!(/([\s]|^)([\w]+)/) {|m| $1.to_s + $2.to_s.downcase }
if Premailer.is_media_query?(media_types) || selector =~ Premailer::RE_UNMERGABLE_SELECTORS
@unmergable_rules.add_rule_set!(CssParser::RuleSet.new(selector, declaration), media_types) unless @options[:preserve_styles]
else
begin
if selector =~ Premailer::RE_RESET_SELECTORS
# this is in place to preserve the MailChimp CSS reset: http://github.com/mailchimp/Email-Blueprints/
# however, this doesn't mean for testing pur
@unmergable_rules.add_rule_set!(CssParser::RuleSet.new(selector, declaration)) unless !@options[:preserve_reset]
end
# Change single ID CSS selectors into xpath so that we can match more
# than one element. Added to work around dodgy generated code.
selector.gsub!(/\A\#([\w_\-]+)\Z/, '*[@id=\1]')
doc.search(selector).each do |el|
if el.elem? and (el.name != 'head' and el.parent.name != 'head')
# Add a style attribute or append to the existing one
block = "[SPEC=#{specificity}[#{declaration}]]"
el['style'] = (el.attributes['style'].to_s ||= '') + ' ' + block
end
end
rescue ::Nokogiri::SyntaxError, RuntimeError, ArgumentError
$stderr.puts "CSS syntax error with selector: #{selector}" if @options[:verbose]
next
end
end
end
# Remove script tags
if @options[:remove_scripts]
doc.search("script").remove
end
# Read STYLE attributes and perform folding
doc.search("*[@style]").each do |el|
style = el.attributes['style'].to_s
declarations = []
style.scan(/\[SPEC\=([\d]+)\[(.[^\]\]]*)\]\]/).each do |declaration|
rs = CssParser::RuleSet.new(nil, declaration[1].to_s, declaration[0].to_i)
declarations << rs
end
# Perform style folding
merged = CssParser.merge(declarations)
merged.expand_shorthand!
# Duplicate CSS attributes as HTML attributes
if Premailer::RELATED_ATTRIBUTES.has_key?(el.name)
Premailer::RELATED_ATTRIBUTES[el.name].each do |css_att, html_att|
el[html_att] = merged[css_att].gsub(/url\('(.*)'\)/,'\1').gsub(/;$|\s*!important/, '').strip if el[html_att].nil? and not merged[css_att].empty?
end
end
# Collapse multiple rules into one as much as possible.
merged.create_shorthand!
# write the inline STYLE attribute
el['style'] = Premailer.escape_string(merged.declarations_to_s).split(';').map(&:strip).sort.join('; ')
end
doc = write_unmergable_css_rules(doc, @unmergable_rules)
if @options[:remove_classes] or @options[:remove_comments]
doc.traverse do |el|
if el.comment? and @options[:remove_comments]
el.remove
elsif el.element?
el.remove_attribute('class') if @options[:remove_classes]
end
end
end
if @options[:remove_ids]
# find all anchor's targets and hash them
targets = []
doc.search("a[@href^='#']").each do |el|
target = el.get_attribute('href')[1..-1]
targets << target
el.set_attribute('href', "#" + Digest::MD5.hexdigest(target))
end
# hash ids that are links target, delete others
doc.search("*[@id]").each do |el|
id = el.get_attribute('id')
if targets.include?(id)
el.set_attribute('id', Digest::MD5.hexdigest(id))
else
el.remove_attribute('id')
end
end
end
if @options[:reset_contenteditable]
doc.search('*[@contenteditable]').each do |el|
el.remove_attribute('contenteditable')
end
end
@processed_doc = doc
if is_xhtml?
# we don't want to encode carriage returns
@processed_doc.to_xhtml(:encoding => @options[:output_encoding]).gsub(/&\#(xD|13);/i, "\r")
else
@processed_doc.to_html(:encoding => @options[:output_encoding])
end
end
# Create a style element with un-mergable rules (e.g. :hover)
# and write it into the body.
#
# doc is an Nokogiri document and unmergable_css_rules is a Css::RuleSet.
#
# @return [::Nokogiri::XML] a document.
def write_unmergable_css_rules(doc, unmergable_rules) # :nodoc:
styles = unmergable_rules.to_s
unless styles.empty?
style_tag = ""
if body = doc.search('body')
if doc.at_css('body').children && !doc.at_css('body').children.empty?
doc.at_css('body').children.before(::Nokogiri::XML.fragment(style_tag))
else
doc.at_css('body').add_child(::Nokogiri::XML.fragment(style_tag))
end
else
doc.inner_html = style_tag += doc.inner_html
end
end
doc
end
# Converts the HTML document to a format suitable for plain-text e-mail.
#
# If present, uses the element as its base; otherwise uses the whole document.
#
# @return [String] a plain text.
def to_plain_text
html_src = ''
begin
html_src = @doc.at("body").inner_html
rescue; end
html_src = @doc.to_html unless html_src and not html_src.empty?
convert_to_text(html_src, @options[:line_length], @html_encoding)
end
# Gets the original HTML as a string.
# @return [String] HTML.
def to_s
if is_xhtml?
@doc.to_xhtml(:encoding => nil)
else
@doc.to_html(:encoding => nil)
end
end
# Load the HTML file and convert it into an Nokogiri document.
#
# @return [::Nokogiri::XML] a document.
def load_html(input) # :nodoc:
thing = nil
# TODO: duplicate options
if @options[:with_html_string] or @options[:inline] or input.respond_to?(:read)
thing = input
elsif @is_local_file
@base_dir = File.dirname(input)
thing = File.open(input, 'r')
else
thing = open(input)
end
if thing.respond_to?(:read)
thing = thing.read
end
return nil unless thing
doc = nil
# Handle HTML entities
if @options[:replace_html_entities] == true and thing.is_a?(String)
HTML_ENTITIES.map do |entity, replacement|
thing.gsub! entity, replacement
end
end
# Default encoding is ASCII-8BIT (binary) per http://groups.google.com/group/nokogiri-talk/msg/0b81ef0dc180dc74
# However, we really don't want to hardcode this. ASCII-8BIG should be the default, but not the only option.
if thing.is_a?(String) and RUBY_VERSION =~ /1.9/
thing = thing.force_encoding(@options[:input_encoding]).encode!
doc = ::Nokogiri::HTML(thing, nil, @options[:input_encoding]) {|c| c.recover }
else
default_encoding = RUBY_PLATFORM == 'java' ? nil : 'BINARY'
doc = ::Nokogiri::HTML(thing, nil, @options[:input_encoding] || default_encoding) {|c| c.recover }
end
# Fix for removing any CDATA tags from both style and script tags inserted per
# https://github.com/sparklemotion/nokogiri/issues/311 and
# https://github.com/premailer/premailer/issues/199
%w(style script).each do |tag|
doc.search(tag).children.each do |child|
child.swap(child.text()) if child.cdata?
end
end
doc
end
end
end
end
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