Class: Jekyll::Tags::IncludeTag

Inherits:
Liquid::Tag
  • Object
show all
Defined in:
lib/jekyll/tags/include.rb

Constant Summary collapse

MATCHER = 
/([\w-]+)\s*=\s*(?:"([^"\\]*(?:\\.[^"\\]*)*)"|'([^'\\]*(?:\\.[^'\\]*)*)'|([\w\.-]+))/

Instance Method Summary collapse

Constructor Details

#initialize(tag_name, markup, tokens) ⇒ IncludeTag

Returns a new instance of IncludeTag.



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# File 'lib/jekyll/tags/include.rb', line 7

def initialize(tag_name, markup, tokens)
  super
  @file, @params = markup.strip.split(' ', 2);
end

Instance Method Details

#parse_params(context) ⇒ Object 



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# File 'lib/jekyll/tags/include.rb', line 12

def parse_params(context)
  validate_syntax

  params = {}
  markup = @params

  while match = MATCHER.match(markup) do
    markup = markup[match.end(0)..-1]

    value = if match[2]
      match[2].gsub(/\\"/, '"')
    elsif match[3]
      match[3].gsub(/\\'/, "'")
    elsif match[4]
      context[match[4]]
    end

    params[match[1]] = value
  end
  params
end

#render(context) ⇒ Object 



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# File 'lib/jekyll/tags/include.rb', line 51

def render(context)
  includes_dir = File.join(context.registers[:site].source, '_includes')

  if File.symlink?(includes_dir)
    return "Includes directory '#{includes_dir}' cannot be a symlink"
  end

  if @file !~ /^[a-zA-Z0-9_\/\.-]+$/ || @file =~ /\.\// || @file =~ /\/\./
    return "Include file '#{@file}' contains invalid characters or sequences"
  end

  Dir.chdir(includes_dir) do
    choices = Dir['**/*'].reject { |x| File.symlink?(x) }
    if choices.include?(@file)
      source = File.read(@file)
      partial = Liquid::Template.parse(source)

      context.stack do
        context['include'] = parse_params(context) if @params
        partial.render(context)
      end
    else
      "Included file '#{@file}' not found in _includes directory"
    end
  end
end

#validate_syntax ⇒ Object

ensure the entire markup string from start to end is valid syntax, and params are separated by spaces



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# File 'lib/jekyll/tags/include.rb', line 35

def validate_syntax
  full_matcher = Regexp.compile('\A\s*(?:' + MATCHER.to_s + '(?=\s|\z)\s*)*\z')
  unless @params =~ full_matcher
    raise SyntaxError.new <<-eos
Invalid syntax for include tag:

	#{@params}

Valid syntax:

	{% include file.ext param='value' param2="value" %}

eos
  end
end