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-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2021 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