spc-pleroma/lib/pleroma/earmark_renderer.ex

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# Pleroma: A lightweight social networking server
# Copyright © 2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
#
# This file is derived from Earmark, under the following copyright:
# Copyright © 2014 Dave Thomas, The Pragmatic Programmers
# SPDX-License-Identifier: Apache-2.0
# Upstream: https://github.com/pragdave/earmark/blob/master/lib/earmark/html_renderer.ex
defmodule Pleroma.EarmarkRenderer do
@moduledoc false
alias Earmark.Block
alias Earmark.Context
alias Earmark.HtmlRenderer
alias Earmark.Options
import Earmark.Inline, only: [convert: 3]
import Earmark.Helpers.HtmlHelpers
import Earmark.Message, only: [add_messages_from: 2, get_messages: 1, set_messages: 2]
import Earmark.Context, only: [append: 2, set_value: 2]
import Earmark.Options, only: [get_mapper: 1]
@doc false
def render(blocks, %Context{options: %Options{}} = context) do
messages = get_messages(context)
{contexts, html} =
get_mapper(context.options).(
blocks,
&render_block(&1, put_in(context.options.messages, []))
)
|> Enum.unzip()
all_messages =
contexts
|> Enum.reduce(messages, fn ctx, messages1 -> messages1 ++ get_messages(ctx) end)
{put_in(context.options.messages, all_messages), html |> IO.iodata_to_binary()}
end
#############
# Paragraph #
#############
defp render_block(%Block.Para{lnb: lnb, lines: lines, attrs: attrs}, context) do
lines = convert(lines, lnb, context)
add_attrs(lines, "<p>#{lines.value}</p>", attrs, [], lnb)
end
########
# Html #
########
defp render_block(%Block.Html{html: html}, context) do
{context, html}
end
defp render_block(%Block.HtmlComment{lines: lines}, context) do
{context, lines}
end
defp render_block(%Block.HtmlOneline{html: html}, context) do
{context, html}
end
#########
# Ruler #
#########
defp render_block(%Block.Ruler{lnb: lnb, attrs: attrs}, context) do
add_attrs(context, "<hr />", attrs, [], lnb)
end
###########
# Heading #
###########
defp render_block(
%Block.Heading{lnb: lnb, level: level, content: content, attrs: attrs},
context
) do
converted = convert(content, lnb, context)
html = "<h#{level}>#{converted.value}</h#{level}>"
add_attrs(converted, html, attrs, [], lnb)
end
##############
# Blockquote #
##############
defp render_block(%Block.BlockQuote{lnb: lnb, blocks: blocks, attrs: attrs}, context) do
{context1, body} = render(blocks, context)
html = "<blockquote>#{body}</blockquote>"
add_attrs(context1, html, attrs, [], lnb)
end
#########
# Table #
#########
defp render_block(
%Block.Table{lnb: lnb, header: header, rows: rows, alignments: aligns, attrs: attrs},
context
) do
{context1, html} = add_attrs(context, "<table>", attrs, [], lnb)
context2 = set_value(context1, html)
context3 =
if header do
append(add_trs(append(context2, "<thead>"), [header], "th", aligns, lnb), "</thead>")
else
# Maybe an error, needed append(context, html)
context2
end
context4 = append(add_trs(append(context3, "<tbody>"), rows, "td", aligns, lnb), "</tbody>")
{context4, [context4.value, "</table>"]}
end
########
# Code #
########
defp render_block(
%Block.Code{lnb: lnb, language: language, attrs: attrs} = block,
%Context{options: options} = context
) do
class =
if language, do: ~s{ class="#{code_classes(language, options.code_class_prefix)}"}, else: ""
tag = ~s[<pre><code#{class}>]
lines = options.render_code.(block)
html = ~s[#{tag}#{lines}</code></pre>]
add_attrs(context, html, attrs, [], lnb)
end
#########
# Lists #
#########
defp render_block(
%Block.List{lnb: lnb, type: type, blocks: items, attrs: attrs, start: start},
context
) do
{context1, content} = render(items, context)
html = "<#{type}#{start}>#{content}</#{type}>"
add_attrs(context1, html, attrs, [], lnb)
end
# format a single paragraph list item, and remove the para tags
defp render_block(
%Block.ListItem{lnb: lnb, blocks: blocks, spaced: false, attrs: attrs},
context
)
when length(blocks) == 1 do
{context1, content} = render(blocks, context)
content = Regex.replace(~r{</?p>}, content, "")
html = "<li>#{content}</li>"
add_attrs(context1, html, attrs, [], lnb)
end
# format a spaced list item
defp render_block(%Block.ListItem{lnb: lnb, blocks: blocks, attrs: attrs}, context) do
{context1, content} = render(blocks, context)
html = "<li>#{content}</li>"
add_attrs(context1, html, attrs, [], lnb)
end
##################
# Footnote Block #
##################
defp render_block(%Block.FnList{blocks: footnotes}, context) do
items =
Enum.map(footnotes, fn note ->
blocks = append_footnote_link(note)
%Block.ListItem{attrs: "#fn:#{note.number}", type: :ol, blocks: blocks}
end)
{context1, html} = render_block(%Block.List{type: :ol, blocks: items}, context)
{context1, Enum.join([~s[<div class="footnotes">], "<hr />", html, "</div>"])}
end
#######################################
# Isolated IALs are rendered as paras #
#######################################
defp render_block(%Block.Ial{verbatim: verbatim}, context) do
{context, "<p>{:#{verbatim}}</p>"}
end
####################
# IDDef is ignored #
####################
defp render_block(%Block.IdDef{}, context), do: {context, ""}
#####################################
# And here are the inline renderers #
#####################################
defdelegate br, to: HtmlRenderer
defdelegate codespan(text), to: HtmlRenderer
defdelegate em(text), to: HtmlRenderer
defdelegate strong(text), to: HtmlRenderer
defdelegate strikethrough(text), to: HtmlRenderer
defdelegate link(url, text), to: HtmlRenderer
defdelegate link(url, text, title), to: HtmlRenderer
defdelegate image(path, alt, title), to: HtmlRenderer
defdelegate footnote_link(ref, backref, number), to: HtmlRenderer
# Table rows
defp add_trs(context, rows, tag, aligns, lnb) do
numbered_rows =
rows
|> Enum.zip(Stream.iterate(lnb, &(&1 + 1)))
numbered_rows
|> Enum.reduce(context, fn {row, lnb}, ctx ->
append(add_tds(append(ctx, "<tr>"), row, tag, aligns, lnb), "</tr>")
end)
end
defp add_tds(context, row, tag, aligns, lnb) do
Enum.reduce(1..length(row), context, add_td_fn(row, tag, aligns, lnb))
end
defp add_td_fn(row, tag, aligns, lnb) do
fn n, ctx ->
style =
case Enum.at(aligns, n - 1, :default) do
:default -> ""
align -> " style=\"text-align: #{align}\""
end
col = Enum.at(row, n - 1)
converted = convert(col, lnb, set_messages(ctx, []))
append(add_messages_from(ctx, converted), "<#{tag}#{style}>#{converted.value}</#{tag}>")
end
end
###############################
# Append Footnote Return Link #
###############################
defdelegate append_footnote_link(note), to: HtmlRenderer
defdelegate append_footnote_link(note, fnlink), to: HtmlRenderer
defdelegate render_code(lines), to: HtmlRenderer
defp code_classes(language, prefix) do
["" | String.split(prefix || "")]
|> Enum.map(fn pfx -> "#{pfx}#{language}" end)
|> Enum.join(" ")
end
end