Class: ContentUrls::JavaScriptParser

Inherits:
Object
  • Object
show all
Defined in:
lib/content_urls/parsers/java_script_parser.rb

Overview

JavaScriptParser finds and rewrites URLs in JavaScript content.

Implementation note:

This methods in this class identify URLs by locating strings which match URI‘s regexp.

Class Method Summary collapse

Class Method Details

.rewrite_each_url(content, &block) ⇒ Object

Rewrites each URL in the JavaScript content by calling the supplied block with each URL.

Examples:

Rewrite URLs in JavaScript code

javascript = 'var link="http://example.com/"'
javascript = ContentUrls::JavaScriptParser.rewrite_each_url(javascript) {|url| url.upcase}
puts "Rewritten: #{javascript}"
# => "Rewritten: var link="HTTP://EXAMPLE.COM/""

Parameters:

  • content (String) —

    the JavaScript content.



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# File 'lib/content_urls/parsers/java_script_parser.rb', line 41

def self.rewrite_each_url(content, &block)
  rewritten_content = content.dup
  rewrite_urls = {}
  parser = RKelly::Parser.new
  ast = parser.parse(content)
  return content if ast.nil?
  ast.each do |node|
    if node.kind_of? RKelly::Nodes::StringNode
      value = node.value
      if match = /^'(.*)'$/.match(value)
        value = match[1]  # remove single quotes
      end
      if match = URI.regexp.match(value)
        url = match.to_s
        rewritten_url = yield url
        rewrite_urls[url] = rewritten_url if url != rewritten_url
      end
    end
  end
  if rewrite_urls.count > 0
    rewrite_urls.each do |url, rewritten_url|
      rewritten_content[url] = rewritten_url.to_s
    end
  end
  rewritten_content
end

.urls(content) ⇒ Array

Returns the URLs found in the JavaScript content.

Examples:

Parse JavaScript code for URLs

javascript = 'var link="http://example.com/"'
ContentUrls::JavaScriptParser.urls(javascript).each do |url|
  puts "Found URL: #{url}"
end
# => "Found URL: http://example.com/"

Parameters:

  • content (String) —

    the JavaScript content.

Returns:

  • (Array) —

    the unique URLs found in the content.



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# File 'lib/content_urls/parsers/java_script_parser.rb', line 23

def self.urls(content)
  urls = []
  return urls if content.nil? || content.length == 0
  rewrite_each_url(content) { |url| urls << url; url }
  urls.uniq!
  urls
end