Speed Up HTML Rendering Using raw_html

[PingoLee]

Hi, I was wondering if we could add this function to 'src/renderers/Html.jl'. It would make static page rendering faster.

function raw_html(viewfile::Genie.Renderer.FilePath;
          layout::Union{Nothing,Genie.Renderer.FilePath,String} = nothing,
          cache::Union{Nothing,String} = nothing,
          status::Int = 200,
          headers::Genie.Renderer.HTTPHeaders = Genie.Renderer.HTTPHeaders(),
          vars...) :: Genie.Renderer.HTTP.Response
  
  Genie.Renderer.WebRenderable(Genie.Renderer.render(MIME"text/html", viewfile, cache; layout, vars...), status, headers) |> Genie.Renderer.respond
end

"""Render a raw HTML string with HTML escaping for variables"""
function Genie.Renderer.render(::Type{MIME"text/html"}, viewfile::Genie.Renderer.FilePath, cache::Union{Nothing,String};
                                layout::Union{String,Nothing,Genie.Renderer.FilePath} = nothing, vars...)::Genie.Renderer.WebRenderable
  try
    sview = read(viewfile, String)
    if layout !== nothing
      slayout::String = if isa(layout, Genie.Renderer.FilePath)
        read(layout, String)
      else
        layout
      end
      sview = replace(slayout,  r"<%\s*@yield\s*%>" => sview)
    end
    
    for (k, v) in vars
      pattern = "<%\\s*" * escape_string(k |> string) * "\\s*%>"  # Construct the pattern string with k interpolated
      regex = Regex(pattern)  # Convert the pattern string into a Regex object
      sview = replace(sview, regex => v)  # Use the regex in the replace function
    end

    # remove other <% %> tags
    sview = replace(sview, r"<%\s*.*\s*%>" => "")
    
    Genie.Renderer.WebRenderable(sview)
  catch ex
    isa(ex, KeyError) && Genie.Renderer.changebuilds() # it's a view error so don't reuse them
    rethrow(ex)
  end
end

Example to use:

route("/") do
  Genie.Renderer.Html.raw_html(Genie.Renderer.filepath("layouts\\templates\\linkage.jl.html"), layout = Genie.Renderer.filepath("layouts\\app.jl.html"), scripts="<script src='/js/cust/linksus.js'></script>")
end

[essenciary]

@PingoLee Thanks for this.
Without seeing the actual view file and the output I don't fully understand the benefits. Is this different than generating a ParsedHTMLString? What problems does this solve that ParsedHTMLString doesn't?
Also, would be easier if you make a PR and add a test so we can run the code.

[PingoLee]

Maybe I misunderstood the ParsedHTMLString, I have a clone from Genie at https://github.com/PingoLee/Genie.jl.
In the test exists a test_raw_html.jl file.

In the first execution, I have this:

julia> @time Genie.Renderer.Html.raw_html(Genie.Renderer.filepath("layouts\\templates\\linkage.jl.html"), layout = Genie.Renderer.filepath("layouts\\app.jl.html"), scripts="<script src='/js/cust/linksus.js'></script>");
  0.009437 seconds (1.09 k allocations: 132.984 KiB, 94.76% compilation time)

julia> @time Genie.Renderer.Html.html(Genie.Renderer.filepath("layouts\\templates\\linkage.jl.html"), layout = Genie.Renderer.filepath("layouts\\app.jl.html"), scripts="<script src='/js/cust/linksus.js'></script>");
  8.317553 seconds (17.03 M allocations: 851.294 MiB, 1.37% gc time, 98.59% compilation time)