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inline_css.go
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inline_css.go
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package premailer
import (
"bytes"
"crypto/md5"
"fmt"
"golang.org/x/net/html"
)
func (p *Premailer) ToInlineCSS() (string, error) {
inlined, err := Douceur(string(p.orig))
if err != nil {
return "", err
}
if p.RemoveScripts {
removeAllElement(inlined, "script")
}
if p.RemoveClasses || p.RemoveComments {
eachElement(inlined, func(n *html.Node) bool {
if p.RemoveComments && n.Type == html.CommentNode {
if n.Parent != nil {
n.Parent.RemoveChild(n)
}
} else if p.RemoveClasses && n.Type == html.ElementNode {
var attrs []html.Attribute
for _, attr := range n.Attr {
if attr.Key == "class" {
continue
}
attrs = append(attrs, attr)
}
n.Attr = attrs
}
return true
})
}
if p.RemoveIDs {
targets := make(map[string]struct{})
// find all anchor's targets and hash them
eachElement(inlined, func(n *html.Node) bool {
if n.Type == html.ElementNode && n.Data == "a" {
var attrs []html.Attribute
for _, attr := range n.Attr {
if attr.Key == "href" && attr.Val[0] == '#' {
targets[attr.Val[1:]] = struct{}{}
attr.Val = fmt.Sprintf("#%x", md5.Sum([]byte(attr.Val[1:])))
}
attrs = append(attrs, attr)
}
n.Attr = attrs
}
return true
})
// hash ids that are links target, delete others
eachElement(inlined, func(n *html.Node) bool {
var attrs []html.Attribute
for _, attr := range n.Attr {
if attr.Key == "id" {
if _, ok := targets[attr.Val]; ok {
attr.Val = fmt.Sprintf("%x", md5.Sum([]byte(attr.Val)))
} else {
continue
}
}
attrs = append(attrs, attr)
}
n.Attr = attrs
return true
})
}
if p.ResetContentEditable {
eachElement(inlined, func(n *html.Node) bool {
removeAttribute(n, "contenteditable")
return true
})
}
// @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
p.processed = inlined
var buf bytes.Buffer
err = html.Render(&buf, p.processed)
if err != nil {
return "", err
}
return string(buf.Bytes()), nil
}
// # Create a <tt>style</tt> element with un-mergable rules (e.g. <tt>:hover</tt>)
// # and write it into the <tt>body</tt>.
// #
// # <tt>doc</tt> is an Nokogiri document and <tt>unmergable_css_rules</tt> 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 = "<style type=\"text/css\">\n#{styles}</style>"
// unless (body = doc.search('body')).empty?
// 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 <body> 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-8BIT 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