199 lines
9.7 KiB
Elixir
199 lines
9.7 KiB
Elixir
defmodule MfmParser.Encoder do
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alias MfmParser.Parser
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alias MfmParser.Node
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@moduledoc """
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An encoder who can turn a tree into HTML.
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It only works for the MFM specific tags of the form $[name.opts content].
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Other parts of MFM (html, Markdown and [KaTeX](https://katex.org/)) are out of scope for this project.
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It can directly take input from function `MfmParser.Parser.parse`.
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## Examples
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iex> [
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...> %MfmParser.Node.MFM.Twitch{
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...> children: [%MfmParser.Node.Text{props: %{text: "🍮"}}],
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...> props: %{speed: "5s"}
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...> }
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...> ]
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...> |> MfmParser.Encoder.to_html()
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"<span class=\\"mfm\\" style=\\"display: inline-block; animation: 5s ease 0s infinite normal none running mfm-twitch;\\">🍮</span>"
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iex> MfmParser.Parser.parse("$[twitch.speed=5s 🍮]") |> MfmParser.Encoder.to_html()
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"<span class=\\"mfm\\" style=\\"display: inline-block; animation: 5s ease 0s infinite normal none running mfm-twitch;\\">🍮</span>"
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"""
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def to_html(tree) when is_list(tree) do
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{html, _styles} = to_html_styles(tree)
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html
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end
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def to_html(input) when is_binary(input) do
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Parser.parse(input) |> to_html()
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end
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defp to_html_styles(tree, _style \\ []) do
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tree
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|> Enum.reduce({"", []}, fn node, {html, styles} ->
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case node do
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%Node.Text{} ->
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{html <> node.props.text, styles}
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%Node.Newline{} ->
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{html <> node.props.text, styles}
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%Node.MFM.Flip{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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case node.props do
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%{v: true, h: true} ->
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{html <>
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"<span class=\"mfm\" style=\"display: inline-block; transform: scale(-1);\">#{html_child}</span>",
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styles}
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%{v: true} ->
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{html <>
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"<span class=\"mfm\" style=\"display: inline-block; transform: scaleY(-1);\">#{html_child}</span>",
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styles}
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_ ->
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{html <>
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"<span class=\"mfm\" style=\"display: inline-block; transform: scaleX(-1);\">#{html_child}</span>",
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styles ++ styles_child}
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end
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%Node.MFM.Font{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <>
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"<span class=\"mfm\" style=\"display: inline-block; font-family: #{node.props.font};\">#{html_child}</span>",
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styles ++ styles_child}
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%Node.MFM.X{} ->
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prop_map = %{"200%" => "2", "400%" => "3", "600%" => "4"}
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{html_child, styles_child} = to_html_styles(node.children)
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{html <>
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"<span style=\"font-size: #{node.props.size}\" class=\"mfm _mfm_x#{prop_map[node.props.size]}_\">#{html_child}</span>",
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styles ++ styles_child}
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%Node.MFM.Blur{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <> "<span class=\"_mfm_blur_\">#{html_child}</span>",
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styles ++
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[
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"._mfm_blur_ { filter: blur(6px); transition: filter .3s; } ._mfm_blur_:hover { filter: blur(0px); }"
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] ++ styles_child}
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%Node.MFM.Jelly{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <> "<span class=\"mfm _mfm_jelly_\" style=\"display: inline-block; animation: #{node.props.speed} linear 0s infinite normal both running mfm-rubberBand;\">#{html_child}</span>", styles_child}
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%Node.MFM.Tada{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <>
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"<span class=\"mfm _mfm_tada_\" style=\"display: inline-block; font-size: 150%; animation: #{node.props.speed} linear 0s infinite normal both running mfm-tada;\">#{html_child}</span>", styles_child}
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%Node.MFM.Jump{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <> "<span class=\"mfm _mfm_jump_\" style=\"display: inline-block; animation: #{node.props.speed} linear 0s infinite normal none running mfm-jump;\">#{html_child}</span>", styles_child}
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%Node.MFM.Bounce{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <> "<span class=\"mfm _mfm_bounce_\" style=\"display: inline-block; animation: #{node.props.speed} linear 0s infinite normal none running mfm-bounce; transform-origin: center bottom 0px;\">#{html_child}</span>", styles_child}
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%Node.MFM.Spin{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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styles_map = %{
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"x" =>
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"@keyframes mfm-spinX { 0% { transform:perspective(128px) rotateX(0) } to { transform:perspective(128px) rotateX(360deg) }}",
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"y" =>
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"@keyframes mfm-spinY { 0% { transform:perspective(128px) rotateY(0) } to { transform:perspective(128px) rotateY(360deg) }}",
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"z" =>
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"@keyframes mfm-spin { 0% { transform:rotate(0) } to { transform:rotate(360deg) }}"
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}
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keyframe_names_map = %{
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"x" => "mfm-spinX",
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"y" => "mfm-spinY",
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"z" => "mfm-spin"
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}
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directions_map = %{
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"left" => "reverse"
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}
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{html <>
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"<span class=\"mfm _mfm_spin_\" style=\"display: inline-block; animation: #{node.props.speed} linear 0s infinite #{Map.get(directions_map, node.props.direction, node.props.direction)} none running #{Map.get(keyframe_names_map, node.props.axis, "")};\">#{html_child}</span>",
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styles ++ [Map.get(styles_map, node.props.axis, "")] ++ styles_child}
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%Node.MFM.Shake{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <>
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"<span class=\"mfm\" style=\"display: inline-block; animation: #{node.props.speed} ease 0s infinite normal none running mfm-shake;\">#{html_child}</span>",
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styles ++
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[
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"@keyframes mfm-shake { 0% { transform:translate(-3px,-1px) rotate(-8deg) } 5% { transform:translateY(-1px) rotate(-10deg) } 10% { transform:translate(1px,-3px) rotate(0) } 15% { transform:translate(1px,1px) rotate(11deg) } 20% { transform:translate(-2px,1px) rotate(1deg) } 25% { transform:translate(-1px,-2px) rotate(-2deg) } 30% { transform:translate(-1px,2px) rotate(-3deg) } 35% { transform:translate(2px,1px) rotate(6deg) } 40% { transform:translate(-2px,-3px) rotate(-9deg) } 45% { transform:translateY(-1px) rotate(-12deg) } 50% { transform:translate(1px,2px) rotate(10deg) } 55% { transform:translateY(-3px) rotate(8deg) } 60% { transform:translate(1px,-1px) rotate(8deg) } 65% { transform:translateY(-1px) rotate(-7deg) } 70% { transform:translate(-1px,-3px) rotate(6deg) } 75% { transform:translateY(-2px) rotate(4deg) } 80% { transform:translate(-2px,-1px) rotate(3deg) } 85% { transform:translate(1px,-3px) rotate(-10deg) } 90% { transform:translate(1px) rotate(3deg) } 95% { transform:translate(-2px) rotate(-3deg) } to { transform:translate(2px,1px) rotate(2deg) }}"
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] ++ styles_child}
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%Node.MFM.Twitch{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <>
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"<span class=\"mfm\" style=\"display: inline-block; animation: #{node.props.speed} ease 0s infinite normal none running mfm-twitch;\">#{html_child}</span>",
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styles ++
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[
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"@keyframes mfm-twitch { 0% { transform:translate(7px,-2px) } 5% { transform:translate(-3px,1px) } 10% { transform:translate(-7px,-1px) } 15% { transform:translateY(-1px) } 20% { transform:translate(-8px,6px) } 25% { transform:translate(-4px,-3px) } 30% { transform:translate(-4px,-6px) } 35% { transform:translate(-8px,-8px) } 40% { transform:translate(4px,6px) } 45% { transform:translate(-3px,1px) } 50% { transform:translate(2px,-10px) } 55% { transform:translate(-7px) } 60% { transform:translate(-2px,4px) } 65% { transform:translate(3px,-8px) } 70% { transform:translate(6px,7px) } 75% { transform:translate(-7px,-2px) } 80% { transform:translate(-7px,-8px) } 85% { transform:translate(9px,3px) } 90% { transform:translate(-3px,-2px) } 95% { transform:translate(-10px,2px) } to { transform:translate(-2px,-6px) }}"
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] ++ styles_child}
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%Node.MFM.Rainbow{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <>
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"<span class=\"mfm\" style=\"display: inline-block; animation: #{node.props.speed} linear 0s infinite normal none running mfm-rainbow;\">#{html_child}</span>",
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styles ++
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[
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"@keyframes mfm-rainbow { 0% { filter:hue-rotate(0deg) contrast(150%) saturate(150%) } to { filter:hue-rotate(360deg) contrast(150%) saturate(150%) }}"
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] ++ styles_child}
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%Node.MFM.Sparkle{} ->
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# TODO: This is not how Misskey does it and should be changed to make it work like Misskey.
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{html_child, styles_child} = to_html_styles(node.children)
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{html <>
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"<span class=\"mfm\" style=\"display: inline-block; animation: 1s linear 0s infinite normal none running mfm-sparkle;\">#{html_child}</span>",
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styles ++
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[
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"@keyframes mfm-sparkle { 0% { filter: brightness(100%) } to { filter: brightness(300%) }}"
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] ++ styles_child}
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%Node.MFM.Rotate{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <>
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"<span class=\"mfm\" style=\"display: inline-block; transform: rotate(90deg); transform-origin: center center 0px;\">#{html_child}</span>",
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styles ++ styles_child}
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%Node.MFM.Undefined{} ->
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{html_child, styles_child} = to_html_styles(node.children)
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{html <>
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"<span>#{html_child}</span>", styles ++ styles_child}
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_ ->
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{html, styles}
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end
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end)
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end
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end
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