Class: ZMediumFetcher

Inherits:
Object
  • Object
show all
Defined in:
lib/ZMediumFetcher.rb

Defined Under Namespace

Classes: Progress

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ZMediumFetcher

Returns a new instance of ZMediumFetcher.



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# File 'lib/ZMediumFetcher.rb', line 71

def initialize
    @progress = Progress.new()
    @linkParser = LinkParser.new(nil)
end

Instance Attribute Details

#linkParser ⇒ Object

Returns the value of attribute linkParser.



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# File 'lib/ZMediumFetcher.rb', line 32

def linkParser
  @linkParser
end

#progress ⇒ Object

Returns the value of attribute progress.



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# File 'lib/ZMediumFetcher.rb', line 32

def progress
  @progress
end

Instance Method Details

#buildParser(imagePathPolicy) ⇒ Object 



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# File 'lib/ZMediumFetcher.rb', line 76

def buildParser(imagePathPolicy)
    h1Parser = H1Parser.new()
    h2Parser = H2Parser.new()
        h1Parser.setNext(h2Parser)
    h3Parser = H3Parser.new()
        h2Parser.setNext(h3Parser)
    h4Parser = H4Parser.new()
        h3Parser.setNext(h4Parser)
    ppParser = PParser.new()
        h4Parser.setNext(ppParser)
    uliParser = ULIParser.new()
        ppParser.setNext(uliParser)
    oliParser = OLIParser.new()
        uliParser.setNext(oliParser)
    mixtapeembedParser = MIXTAPEEMBEDParser.new()
        oliParser.setNext(mixtapeembedParser)
    pqParser = PQParser.new()
        mixtapeembedParser.setNext(pqParser)
    iframeParser = IframeParser.new()
    iframeParser.pathPolicy = imagePathPolicy
        pqParser.setNext(iframeParser)
    imgParser = IMGParser.new()
    imgParser.pathPolicy = imagePathPolicy
        iframeParser.setNext(imgParser)
    bqParser = BQParser.new()
        imgParser.setNext(bqParser)
    preParser = PREParser.new()
        bqParser.setNext(preParser)
    codeBlockParser = CodeBlockParser.new()
        preParser.setNext(codeBlockParser)
    fallbackParser = FallbackParser.new()
        codeBlockParser.setNext(fallbackParser)


    h1Parser
end

#downloadPost(postURL, pathPolicy) ⇒ Object 



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# File 'lib/ZMediumFetcher.rb', line 113

def downloadPost(postURL, pathPolicy)
    postID = Post.getPostIDFromPostURLString(postURL)
    postPath = Post.getPostPathFromPostURLString(postURL)

    progress.postPath = postPath
    progress.message = "Downloading Post..."
    progress.printLog()

    postHtml = Request.html(Request.URL(postURL))

    postContent = Post.parsePostContentFromHTML(postHtml)
    if postContent.nil?
        raise "Error: Content is empty! PostURL: #{postURL}"
    end
    
    postInfo = Post.parsePostInfoFromPostContent(postContent, postID)

    sourceParagraphs = Post.parsePostParagraphsFromPostContent(postContent, postID)
    if sourceParagraphs.nil?
        raise "Error: Paragraph not found! PostURL: #{postURL}"
    end 
    
    progress.message = "Formatting Data..."
    progress.printLog()

    paragraphs = []
    oliIndex = 0
    previousParagraph = nil
    preTypeParagraphs = []
    sourceParagraphs.each do |sourcParagraph|
        paragraph = Paragraph.new(sourcParagraph, postID, postContent)
        if OLIParser.isOLI(paragraph)
            oliIndex += 1
            paragraph.oliIndex = oliIndex
        else
            oliIndex = 0
        end

        # if previous is OLI or ULI and current is not OLI or ULI
        # than insert a blank paragraph to keep markdown foramt correct
        if (OLIParser.isOLI(previousParagraph) && !OLIParser.isOLI(paragraph)) ||
            (ULIParser.isULI(previousParagraph) && !ULIParser.isULI(paragraph))
            paragraphs.append(Paragraph.makeBlankParagraph(postID))
        end

        # group by PRE paragraph to code block
        # because medium will give continue pre to present code block
        # e.g.
        # type=pre, text=<html>
        # type=pre, text=text
        # type=pre, text=</html>
        
        if !previousParagraph.nil?
            if PREParser.isPRE(paragraph)
                # if current is pre
                preTypeParagraphs.append(paragraph)
            elsif PREParser.isPRE(previousParagraph) && !PREParser.isPRE(paragraph)
                # if current is note pre and previousParagraph is pre and preTypeParagraphs > 1
                if preTypeParagraphs.length > 1
                    lastPreTypeParagraph = preTypeParagraphs.pop

                    # group by preParagraphs text to last preParagraph
                    groupByText = ""
                    preTypeParagraphs.each do |preTypeParagraph|
                        if groupByText != ""
                            groupByText += "\n"
                        end

                        markupParser = MarkupParser.new(postHtml, preTypeParagraph)
                        groupByText += markupParser.parse()
                    end
                    
                    lastPreTypeParagraph.text = "#{groupByText}"
                    lastPreTypeParagraph.type = CodeBlockParser.getTypeString()
                    
                    # remove all preParagraphs
                    preTypeParagraphNames = preTypeParagraphs.map do |preTypeParagraph|
                        preTypeParagraph.name
                    end
                    paragraphs = paragraphs.select do |paragraph| 
                        !preTypeParagraphNames.include? paragraph.name
                    end
                end
                preTypeParagraphs = []
            end
        end

        paragraphs.append(paragraph)
        previousParagraph = paragraph
    end

    postPathPolicy = PathPolicy.new(pathPolicy.getAbsolutePath(nil), "posts")

    imagePathPolicy = PathPolicy.new(postPathPolicy.getAbsolutePath(nil), "images")
    startParser = buildParser(imagePathPolicy)

    progress.totalPostParagraphsLength = paragraphs.length
    progress.currentPostParagraphIndex = 0
    progress.message = "Converting Post..."
    progress.printLog()

    absolutePath = postPathPolicy.getAbsolutePath("#{postPath}.md")
    
    # if markdown file is exists and last modification time is >= latestPublishedAt(last update post time on medium)
    if File.file?(absolutePath) && File.mtime(absolutePath) >= postInfo.latestPublishedAt
        # Already downloaded and nothing has changed!, Skip!
        progress.currentPostParagraphIndex = paragraphs.length
        progress.message = "Skip, Post already downloaded and nothing has changed!"
        progress.printLog()
    else
        Helper.createDirIfNotExist(postPathPolicy.getAbsolutePath(nil))
        File.open(absolutePath, "w+") do |file|
            # write postInfo into top
            file.puts(Helper.createPostInfo(postInfo))
            
            index = 0
            paragraphs.each do |paragraph|
                markupParser = MarkupParser.new(postHtml, paragraph)
                paragraph.text = markupParser.parse()
                result = startParser.parse(paragraph)

                if !linkParser.nil?
                    result = linkParser.parse(result, paragraph.markupLinks)
                end
                
                file.puts(result)

                index += 1
                progress.currentPostParagraphIndex = index
                progress.message = "Converting Post..."
                progress.printLog()
            end

            file.puts(Helper.createWatermark(postURL))
        end
        FileUtils.touch absolutePath, :mtime => postInfo.latestPublishedAt

        progress.message = "Post Successfully Downloaded!"
        progress.printLog()
    end
    
    progress.postPath = nil
end

#downloadPostsByUsername(username, pathPolicy) ⇒ Object 



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# File 'lib/ZMediumFetcher.rb', line 257

def downloadPostsByUsername(username, pathPolicy)
    progress.username = username
    progress.message = "Fetching infromation..."
    progress.printLog()

    userID = User.convertToUserIDFromUsername(username)
    if userID.nil?
        raise "Medium's Username:#{username} not found!"
    end

    progress.message = "Fetching posts..."
    progress.printLog()

    postURLS = []
    nextID = nil
    begin
        postPageInfo = User.fetchUserPosts(userID, nextID)
        postPageInfo["postURLs"].each do |postURL|
            postURLS.append(postURL)
        end
        nextID = postPageInfo["nextID"]
    end while !nextID.nil?

    @linkParser = LinkParser.new(postURLS)

    progress.totalPostsLength = postURLS.length
    progress.currentPostIndex = 0
    progress.message = "Downloading posts..."
    progress.printLog()

    userPathPolicy = PathPolicy.new(pathPolicy.getAbsolutePath(nil), "users/#{username}")
    index = 0
    postURLS.each do |postURL|
        downloadPost(postURL, userPathPolicy)

        index += 1
        progress.currentPostIndex = index
        progress.message = "Downloading posts..."
        progress.printLog()
    end

    progress.message = "All posts has been downloaded!, Total posts: #{postURLS.length}"
    progress.printLog()
end