I have a problem with the Slim template engine in a Sinatra project. I have an edit form to be filled when the route is triggered. There is an issue with HTML select option. I need something like this when the edit form is loaded. Notice that Mrs. option is selected:
<select name="person[title]" id="person[title]">
<option value="Mr.">Mr.</option>
<option value="Mrs." selected>Mrs.</option>
</select>
I tried:
option[value="Mrs." "#{person.title == :mrs ? 'selected' : ''}"]
The exception was about an attribute error. Then I tried something like this:
option[value="Mrs." selected="#{person.title == :mrs ? true : false}"]
but then the output was something like this:
<option value"Mrs." selected="false">Mrs.</option>
I guess the string"false" is interpreted as true. That failed. I tried some combinations with round brackets but couldn't get it to work.
How could I set the selected attribute of an option in a select list in Slim?
For an attribute, you can write ruby code after the =, but if the ruby code has spaces in it, you have to put parentheses around the ruby code:
option[value="1" selected=("selected" if #title=="Mrs.")] "Mrs."
See "Ruby attributes" here: http://rdoc.info/gems/slim/frames.
The brackets are optional, so you can also write it like this:
option value="1" selected=("selected" if #title=="Mrs.") "Mrs."
Or, instead of brackets, you can use a different delimiter:
option {value="1" selected=("selected" if #title=="Mrs.")} "Mrs."
Here it is with some code:
slim.slim:
doctype html
html
head
title Slim Examples
meta name="keywords" content="template language"
body
h1 Markup examples
p This example shows you how a basic Slim file looks like.
select
option[value="1" selected=("selected" if #title=="Mr.")] "Mr."
option[value="2" selected=("selected" if #title=="Mrs.")] "Mrs."
Using Slim in a standalone ruby program without rails:
require 'slim'
template = Slim::Template.new(
"slim.slim",
pretty: true #pretty print the html
)
class Person
attr_accessor :title
def initialize title
#title = title
end
end
person = Person.new("Mrs.")
puts template.render(person)
--output:--
<!DOCTYPE html>
<html>
<head>
<title>
Slim Examples
</title>
<meta content="template language" name="keywords" />
</head>
<body>
<h1>
Markup examples
</h1>
<p>
This example shows you how a basic Slim file looks like.
</p>
<select><option value="1">"Mr."</option><option selected="selected" value="2">"Mrs."</option></select>
</body>
</html>
I guess the string "false" is interpreted as true.
Yes. The only things that evaluate to false are false itself and nil. Any number(including 0), any string (including ""), and any array(including []), etc. are all true.
Not pertinent to your problem, but perhaps useful to some future searcher...I guess Slim looks up instance variables in whatever object you pass as an argument to render. So if you want to provide a whole bunch of values for the template, you can write:
require 'slim'
template = Slim::Template.new(
"slim.slim",
pretty: true #pretty print the html
)
class MyVals
attr_accessor :count, :title, :animals
def initialize count, title, animals
#count = count
#title = title
#animals = animals
end
end
vals = MyVals.new(4, "Sir James III", %w[ squirrel, monkey, cobra ])
puts template.render(vals)
slim.slim:
doctype html
html
head
title Slim Examples
meta name="keywords" content="template language"
body
p =#count
p =#title
p =#animals[-1]
Neither OpenStruct nor Struct work with render() even though they seem like natural candidates.
Related
I have a file formatted like this one:
Eye color
<p class="ul">Eye color, color</p> <p class="ul1">blue, cornflower blue, steely blue</p> <p class="ul1">velvet brown</p> <link rel="stylesheet" href="a.css">
</>
weasel
<p class="ul">weasel</p> <p class="ul1">musteline</p> <link rel="stylesheet" href="a.css">
</>
Each word within the <p class="ul1"> separated by ,should be wrapped in an <a> tag, like this:
Eye color
<p class="ul">Eye color, color</p> <p class="ul1">blue, cornflower blue, steely blue</p> <p class="ul1">velvet brown</p> <link rel="stylesheet" href="a.css">
</>
weasel
<p class="ul">weasel</p> <p class="ul1">musteline</p> <link rel="stylesheet" href="a.css">
</>
There could be one or several words within the <p class="ul1"> tag.
Is this possible in Perl one-liner?
Thanks in advance. Any help is appreciated.
Parse the file using a module and iterate over the elements you need (<p> of class ul1). Extract those comma-separated phrases from each and wrap links around them; then replace the element with that new content. Write the changed tree out in the end.
Using HTML::TreeBuilder (with its workhorse HTML::Element)
use warnings;
use strict;
use feature 'say';
use HTML::Entities;
use HTML::TreeBuilder;
my $file = shift // die "Usage: $0 file\n";
my $tree = HTML::TreeBuilder->new_from_file($file);
foreach my $elem ($tree->look_down(_tag => "p", class => "ul1")) {
my #new_content;
for ($elem->content_list) {
my #w = split /\s*,\s*/;
my $wrapped = join ", ",
map { qq().$_.q() } #w;
push #new_content, $wrapped;
}
$elem->delete_content;
$elem->push_content( #new_content );
};
say decode_entities $tree->as_HTML;
In your case an element ($elem) will have one item in the content_list so you don't have to collect modified content into an array (#new_content) but can process that one piece only, what simplifies the code. Working with a list as above doesn't hurt of course.
I redirect the output of this program to an .html file. The generated file is qouite frugal on newlines. If pretty HTML matters make a pass with a tool like HTML::Tidy or HTML::PrettyPrinter.
In a one-liner? Nah, it's too much. And please don't use regex as there's trouble down the road; it needs close work to get it right, is easy to end up buggy, is sensitive to smallest details, and brittle for even slightest changes in input. And that's when it can do the job. There are reasons for libraries.
Another good tool for this job is Mojo::DOM. For example
use Mojo::DOM;
use Path::Tiny; # only to read the file into a string easily
my $html = path($file)->slurp;
my $dom = Mojo::DOM->new($html);
foreach my $elem ($dom->find('p.ul1')->each) {
my #w = split /,/, $elem->text;
my $new = join ', ',
map { qq().$_.q() } #w;
$elem->replace( $new );
}
say $dom;
Produces the same HTML as above (just nicer, and note no need to deal with entities).
Newer module versions provide new_tag method with which the additional link above is made as
my $new = join ', ',
map { $e->new_tag('a', 'href' => "entry://$_", $_) } #w;
what takes care of some subtle needs (HTML escaping for one). The main docs don't say when this method was added, see changelog (May 2018, so supposedly in v5.28; it works with my 5.29.2).
I padded the shown sample to this file for testing:
<!DOCTYPE html> <title>Eye color</title> <body>
<p class="ul">Eye color, color</p>
<p class="ul1">blue, cornflower blue, steely blue</p>
<p class="ul1">velvet brown</p> <link rel="stylesheet" href="a.css"></>
weasel
<p class="ul">weasel</p>
<p class="ul1">musteline</p> <link rel="stylesheet" href="a.css"></>
</body> </html>
Update It's been clarified that the given markup snippet isn't merely a fragment of a presumably full HTML document but that it is a file (as stated) that stands as shown, as a custom format using HTML; apart from the required changes the rest of it need be preserved.
A particularly unpleasant detail proves to be the </> part; each of HTML::TreeBuilder, Mojo::DOM, and XML::LibXML† discards it while parsing. I couldn't find a way to make them keep that piece.
It was Marpa::HTML that processed the whole fragment as required, changing what was asked while leaving alone the rest of it.
use warnings;
use strict;
use feature 'say';
use Path::Tiny;
use Marpa::HTML qw(html);
my $file = shift // die "Usage: $0 file\n";
my $html = path($file)->slurp;
my $marpa = Marpa::HTML::html(
\$html,
{
'p.ul1' => sub {
return join ', ',
map { qq().$_.q() }
split /\s*,\s*/, Marpa::HTML::contents();
},
}
);
say $$marpa;
The processing of the <p> tags of class ul1 is the same as before: split the content on comma and wrap each piece into an <a> tag, then join them back with ,
This prints (with added line-breaks and indentation for readability)
Eye color
<p class="ul">Eye color, color</p>
blue,
cornflower blue,
steely blue
velvet brown
<link rel="stylesheet" href="a.css">
</>
weasel
<p class="ul">weasel</p> musteline
<link rel="stylesheet" href="a.css">
</>
It is the overall approach of this module that is suited for a task like this
Marpa::HTML is an extremely liberal HTML parser. Marpa::HTML does not reject any documents, no mater how poorly they fit the HTML standards.
Here it processed a custom piece of HTML-like markup, leaving things like </> in place.
†
See this post for an example of very permissive processing of HTML with XML::LibXML
perl -0777 -MWeb::Query=wq -lne'
my $w = wq $_; my $sep = ", ";
$w->filter("p.ul1")->each(sub {
my (undef, $e) = #_;
$e->html(join $sep, map {
qq($_)
} split $sep, $e->text);
});
print $w->as_html;
'
One-liner:
cat text | perl -pE 's{<p class="ul1">\K.*?(?=<\/p>)}{ join ", ", map {qq|$_|} split /, */, $& }eg'
I'm having a very weird problem. Here's my view:
<h1>All Deals</h1>
<%= sanitize print_grouped_deals(#deals) %>
Here's my deals_helper.rb
def print_grouped_deals(grouped_deals_by_date)
grouped_deals_by_date.map do |(date, deals)|
%(<div id='#{date.to_s}-deals'>
<h3>#{brief_time date}</h3>
#{deal_paragraphs_for_group(deals)}</div>)
end.join
end
def deal_paragraphs_for_group(deals)
deals.map do |deal|
%(<p>#{"<span class='warning'>POSSIBLY EXPIRED! -</span>" if deal.probably_expired?} #{link_to deal.headline, deal}</p>)
end.join
end
Of note is the 3rd line in the first method in the second snippet. I cannot get it to add an id to my div tag! If I change <div id='#{date.to_s}-deals'> to <div class='#{date.to_s}-deals'> it adds the class no problem but if I keep it as id= then it just creates a simple <div> tag with no attributes.
Lest we imagine it's something to do with generating multiple divs with ids (although the ids will be different), I've also tried generating a simple <div id="thing" /> from the helper, and I get the same empty div tags as a result.
WTF?
You have to pass a whitelist of attributes to the sanitize helper https://api.rubyonrails.org/classes/ActionView/Helpers/SanitizeHelper.html#method-i-sanitize
To allow id attribute
<%= sanitize print_grouped_deals, attributes: %w(id) %>
To set the default allowed tags or attributes across your application
# In config/application.rb
config.action_view.sanitized_allowed_tags = ['div', 'h3']
config.action_view.sanitized_allowed_attributes = ['id', 'class']
My problem is only execute tag from html content in rails.
I'm using raw, sanitize but all html tag executed
Example
#input = 'go <b>bold</b> <i>bat</i>'
<%=raw #input%>
<%=sanitize #input%>
there are same output: go bold bat
my propose is output: go <b>bold</b> <i>bat</i>
I implementing hash tag like facebook, but user input not safe many hash tag and many html tags
any idea?
thank you
I also struggled with this and the following will help:
#input = 'go'
#input += '<b>bold</b> <i>bat</i>'.encode {xml: :text}
This will format the HTML special characters as raw symbols. More at the docs for String#encode.
You can do:
<% #input = 'go'.html_safe+'<b>bold</b> <i>bat</i>' %>
<%= raw #input %>
#input = 'go'.html_safe
#input += ' <b>bold</b> <i>bat</i>'
<%= #input %>
Well this is probably kind of a silly question but I'm wondering if there's any way to have the generated markup in Jekyll to preserve the indentation of the Liquid-tag. World doesn't end if it isn't solvable. I'm just curious since I like my code to look tidy, even if compiled. :)
For example I have these two:
base.html:
<body>
<div id="page">
{{content}}
</div>
</body>
index.md:
---
layout: base
---
<div id="recent_articles">
{% for post in site.posts %}
<div class="article_puff">
<img src="/resources/images/fancyi.jpg" alt="" />
<h2>{{post.title}}</h2>
<p>{{post.description}}</p>
Read more
</div>
{% endfor %}
</div>
Problem is that the imported {{content}}-tag is rendered without the indendation used above.
So instead of
<body>
<div id="page">
<div id="recent_articles">
<div class="article_puff">
<img src="/resources/images/fancyimage.jpg" alt="" />
<h2>Gettin' down with responsive web design</h2>
<p>Everyone's talking about it. Your client wants it. You need to code it.</p>
Read more
</div>
</div>
</div>
</body>
I get
<body>
<div id="page">
<div id="recent_articles">
<div class="article_puff">
<img src="/resources/images/fancyimage.jpg" alt="" />
<h2>Gettin' down with responsive web design</h2>
<p>Everyone's talking about it. Your client wants it. You need to code it.</p>
Read more
</div>
</div>
</div>
</body>
Seems like only the first line is indented correctly. The rest starts at the beginning of the line... So, multiline liquid-templating import? :)
Using a Liquid Filter
I managed to make this work using a liquid filter. There are a few caveats:
Your input must be clean. I had some curly quotes and non-printable chars that looked like whitespace in a few files (copypasta from Word or some such) and was seeing "Invalid byte sequence in UTF-8" as a Jekyll error.
It could break some things. I was using <i class="icon-file"></i> icons from twitter bootstrap. It replaced the empty tag with <i class="icon-file"/> and bootstrap did not like that. Additionally, it screws up the octopress {% codeblock %}s in my content. I didn't really look into why.
While this will clean the output of a liquid variable such as {{ content }} it does not actually solve the problem in the original post, which is to indent the html in context of the surrounding html. This will provide well formatted html, but as a fragment that will not be indented relative to tags above the fragment. If you want to format everything in context, use the Rake task instead of the filter.
-
require 'rubygems'
require 'json'
require 'nokogiri'
require 'nokogiri-pretty'
module Jekyll
module PrettyPrintFilter
def pretty_print(input)
#seeing some ASCII-8 come in
input = input.encode("UTF-8")
#Parsing with nokogiri first cleans up some things the XSLT can't handle
content = Nokogiri::HTML::DocumentFragment.parse input
parsed_content = content.to_html
#Unfortunately nokogiri-pretty can't use DocumentFragments...
html = Nokogiri::HTML parsed_content
pretty = html.human
#...so now we need to remove the stuff it added to make valid HTML
output = PrettyPrintFilter.strip_extra_html(pretty)
output
end
def PrettyPrintFilter.strip_extra_html(html)
#type declaration
html = html.sub('<?xml version="1.0" encoding="ISO-8859-1"?>','')
#second <html> tag
first = true
html = html.gsub('<html>') do |match|
if first == true
first = false
next
else
''
end
end
#first </html> tag
html = html.sub('</html>','')
#second <head> tag
first = true
html = html.gsub('<head>') do |match|
if first == true
first = false
next
else
''
end
end
#first </head> tag
html = html.sub('</head>','')
#second <body> tag
first = true
html = html.gsub('<body>') do |match|
if first == true
first = false
next
else
''
end
end
#first </body> tag
html = html.sub('</body>','')
html
end
end
end
Liquid::Template.register_filter(Jekyll::PrettyPrintFilter)
Using a Rake task
I use a task in my rakefile to pretty print the output after the jekyll site has been generated.
require 'nokogiri'
require 'nokogiri-pretty'
desc "Pretty print HTML output from Jekyll"
task :pretty_print do
#change public to _site or wherever your output goes
html_files = File.join("**", "public", "**", "*.html")
Dir.glob html_files do |html_file|
puts "Cleaning #{html_file}"
file = File.open(html_file)
contents = file.read
begin
#we're gonna parse it as XML so we can apply an XSLT
html = Nokogiri::XML(contents)
#the human() method is from nokogiri-pretty. Just an XSL transform on the XML.
pretty_html = html.human
rescue Exception => msg
puts "Failed to pretty print #{html_file}: #{msg}"
end
#Yep, we're overwriting the file. Potentially destructive.
file = File.new(html_file,"w")
file.write(pretty_html)
file.close
end
end
We can accomplish this by writing a custom Liquid filter to tidy the html, and then doing {{content | tidy }} to include the html.
A quick search suggests that the ruby tidy gem may not be maintained but that nokogiri is the way to go. This will of course mean installing the nokogiri gem.
See advice on writing liquid filters, and Jekyll example filters.
An example might look something like this: in _plugins, add a script called tidy-html.rb containing:
require 'nokogiri'
module TextFilter
def tidy(input)
desired = Nokogiri::HTML::DocumentFragment.parse(input).to_html
end
end
Liquid::Template.register_filter(TextFilter)
(Untested)
I Have a HTML document with links links, for exemple:
<html>
<body>
<ul>
<li>teste1</li>
<li>teste2</li>
<li>teste3</li>
<ul>
</body>
</html>
I want with Ruby on Rails, with nokogiri or some other method, to have a final doc like this:
<html>
<body>
<ul>
<li>teste1</li>
<li>teste2</li>
<li>teste3</li>
<ul>
</body>
</html>
What's the best strategy to achieve this?
If you choose to use Nokogiri, I think this should work:
require 'cgi'
require 'rubygems' rescue nil
require 'nokogiri'
file_path = "your_page.html"
doc = Nokogiri::HTML(open(file_path))
doc.css("a").each do |link|
link.attributes["href"].value = "http://myproxy.com/?url=#{CGI.escape link.attributes["href"].value}"
end
doc.write_to(open(file_path, 'w'))
If I'm not mistaken rails loads REXML up by default, depending on what you're trying to do you could use this also.
Here is what I did for replacing images src attributes:
doc = Nokogiri::HTML(html)
doc.xpath("//img").each do |img|
img.attributes["src"].value = Absolute_asset_path(img.attributes["src"].value)
end
doc.to_html // simply use .to_html to re-convert to html