Code review part 3
* <https://ilja.space/notice/ALpd6nux5hT2nsfetM> * Previous commit: `|> fill_props(token) after the cond` in the parser * Previous commit: Don't use intention-specific data in the tokens (e.g. left is reverse, x is mfm-spinX) * <https://ilja.space/notice/ALpcK6W59UjkIUofU8> * This commit: Use less files * Previous commit: Change nested if-statement in mfm.ex to `cond do` I also added some more and better info to the README.md and moduledocs.
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Ilja
parent
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49
README.md
49
README.md
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@ -40,3 +40,52 @@ You can also convert the tree into HTML.
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]
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iex> MfmParser.Parser.parse("$[twitch.speed=5s 🍮]") |> MfmParser.to_html()
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"<span style=\\"display: inline-block; animation: 5s ease 0s infinite normal none running mfm-twitch;\\">🍮</span><style>@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) }}</style>"
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## Reading
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### The Parser
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A [parser](https://en.wikipedia.org/wiki/Parsing#Parser) takes in structured text and outputs a so called "tree". A tree is a data structure which can be more easily worked with.
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A parser typically consists of three parts
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* a Reader
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* a Lexer (aka Tokeniser)
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* the Parser
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A Reader typically has a `next` function which takes the next character out of the input and returns it.
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A `peek` function allows it to peek at the next character without changing the input.
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There's also some way of detecting if the eof (End Of File) is reached.
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Depending on the needs of the parser, it may be implemented to allow asking for the nth character instead of just the next.
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A Lexer uses the Reader. It also has a `peek` and `next` function, but instead of returning the next (or nth) character, it returns the next (or nth) token.
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E.g. if you have the MFM `$[spin some text]`, then `$[spin`, `some text`, and `]` can be considered three different tokens.
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The parser takes in the tokens and forms the tree. This is typically a data structure the programming language understands and can more easily work with.
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### The Encoder
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Once we have a good data structure, we can process this and do things with it.
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E.g. an Encoder encodes the tree into a different format.
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### The code
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The code can be found in the *lib* folder. It contains, among other things, the Reader, Lexer, Parse, and Encoder modules.
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The *test* folder contains the unit tests.
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## License
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A parser/encoder for Misskey Flavoured Markdown.
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Copyright (C) 2022 Ilja
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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@ -2,6 +2,30 @@ 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 $[name.opts content].
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Other parts of MFM (html, Markdown and [KaTeX](https://katex.org/)) are out of scope for this project.
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It can directly take input from function `MfmParser.Parser.parse`.
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## Examples
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iex> [
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...> %MfmParser.Node.MFM.Twitch{
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...> children: [%MfmParser.Node.Text{props: %{text: "🍮"}}],
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...> props: %{speed: "5s"}
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...> }
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...> ]
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...> |> MfmParser.Encoder.to_html()
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"<span style=\\"display: inline-block; animation: 5s ease 0s infinite normal none running mfm-twitch;\\">🍮</span><style>@keyframes mfm-twitch { 0% { transform:translate(7px,-2px) } 5% { transform:translate(-3px,1px) } 10% { transform:translate(-7px,-1px) } 15% { transform:translateY(-1px) } 20% { transform:translate(-8px,6px) } 25% { transform:translate(-4px,-3px) } 30% { transform:translate(-4px,-6px) } 35% { transform:translate(-8px,-8px) } 40% { transform:translate(4px,6px) } 45% { transform:translate(-3px,1px) } 50% { transform:translate(2px,-10px) } 55% { transform:translate(-7px) } 60% { transform:translate(-2px,4px) } 65% { transform:translate(3px,-8px) } 70% { transform:translate(6px,7px) } 75% { transform:translate(-7px,-2px) } 80% { transform:translate(-7px,-8px) } 85% { transform:translate(9px,3px) } 90% { transform:translate(-3px,-2px) } 95% { transform:translate(-10px,2px) } to { transform:translate(-2px,-6px) }}</style>"
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iex> MfmParser.Parser.parse("$[twitch.speed=5s 🍮]") |> MfmParser.Encoder.to_html()
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"<span style=\\"display: inline-block; animation: 5s ease 0s infinite normal none running mfm-twitch;\\">🍮</span><style>@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) }}</style>"
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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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@ -1,23 +0,0 @@
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defmodule MfmParser do
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@moduledoc """
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`MfmParser` is a parser for [Misskey Flavoured Markdown](https://mk.nixnet.social/mfm-cheat-sheet).
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It can parse MFM and return a tree. It can also turn a tree into HTML.
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It only works for the MFM specific tags of the form $[name.opts content].
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Other parts of MFM (html, Markdown and [KaTeX](https://katex.org/)) are out of scope here.
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## Examples
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iex> MfmParser.Parser.parse("$[twitch.speed=5s 🍮]")
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[
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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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iex> MfmParser.Parser.parse("$[twitch.speed=5s 🍮]") |> MfmParser.Encoder.to_html()
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"<span style=\\"display: inline-block; animation: 5s ease 0s infinite normal none running mfm-twitch;\\">🍮</span><style>@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) }}</style>"
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"""
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end
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@ -0,0 +1,67 @@
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defmodule MfmParser.Node.Text do
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defstruct props: %{text: ""}
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end
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defmodule MfmParser.Node.Newline do
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defstruct props: %{text: "\n"}
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end
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defmodule MfmParser.Node.MFM.Blur do
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defstruct props: %{}, children: []
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end
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defmodule MfmParser.Node.MFM.Bounce do
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defstruct props: %{speed: "0.75s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Flip do
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defstruct props: %{v: false, h: false}, children: []
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end
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defmodule MfmParser.Node.MFM.Font do
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defstruct props: %{font: nil}, children: []
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end
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defmodule MfmParser.Node.MFM.Jelly do
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defstruct props: %{speed: "1s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Jump do
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defstruct props: %{speed: "0.75s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Rainbow do
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defstruct props: %{speed: "1s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Rotate do
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defstruct props: %{}, children: []
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end
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defmodule MfmParser.Node.MFM.Shake do
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defstruct props: %{speed: "0.5s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Sparkle do
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defstruct props: %{}, children: []
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end
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defmodule MfmParser.Node.MFM.Spin do
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defstruct props: %{axis: "z", direction: "normal", speed: "1.5s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Tada do
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defstruct props: %{speed: "1s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Twitch do
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defstruct props: %{speed: "0.5s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Undefined do
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defstruct props: %{}, children: []
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end
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defmodule MfmParser.Node.MFM.X do
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defstruct props: %{size: nil}, children: []
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end
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@ -1,3 +0,0 @@
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defmodule MfmParser.Node.MFM.Blur do
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defstruct props: %{}, children: []
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end
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@ -1,3 +0,0 @@
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defmodule MfmParser.Node.MFM.Bounce do
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defstruct props: %{speed: "0.75s"}, children: []
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end
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@ -1,3 +0,0 @@
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defmodule MfmParser.Node.MFM.Flip do
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defstruct props: %{v: false, h: false}, children: []
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end
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@ -1,3 +0,0 @@
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defmodule MfmParser.Node.MFM.Font do
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defstruct props: %{font: nil}, children: []
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end
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defmodule MfmParser.Node.MFM.Jelly do
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defstruct props: %{speed: "1s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Jump do
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defstruct props: %{speed: "0.75s"}, children: []
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end
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@ -1,3 +0,0 @@
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defmodule MfmParser.Node.MFM.Rainbow do
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defstruct props: %{speed: "1s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Rotate do
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defstruct props: %{}, children: []
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end
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defmodule MfmParser.Node.MFM.Shake do
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defstruct props: %{speed: "0.5s"}, children: []
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end
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@ -1,3 +0,0 @@
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defmodule MfmParser.Node.MFM.Sparkle do
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defstruct props: %{}, children: []
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end
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defmodule MfmParser.Node.MFM.Spin do
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defstruct props: %{axis: "z", direction: "normal", speed: "1.5s"}, children: []
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end
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defmodule MfmParser.Node.MFM.Tada do
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defstruct props: %{speed: "1s"}, children: []
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end
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@ -1,3 +0,0 @@
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defmodule MfmParser.Node.MFM.Twitch do
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defstruct props: %{speed: "0.5s"}, children: []
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end
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@ -1,3 +0,0 @@
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defmodule MfmParser.Node.MFM.Undefined do
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defstruct props: %{}, children: []
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end
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defmodule MfmParser.Node.MFM.X do
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defstruct props: %{size: nil}, children: []
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end
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defmodule MfmParser.Node.Newline do
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defstruct props: %{text: "\n"}
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end
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defmodule MfmParser.Node.Text do
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defstruct props: %{text: ""}
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end
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@ -3,6 +3,26 @@ defmodule MfmParser.Parser do
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alias MfmParser.Node
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alias MfmParser.Lexer
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@moduledoc """
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`MfmParser` is a parser for [Misskey Flavoured Markdown](https://mk.nixnet.social/mfm-cheat-sheet).
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It can parse MFM and return a tree. It also has an encoder who can turn a tree into HTML.
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It only works for the MFM specific tags of the form $[name.opts content].
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Other parts of MFM (html, Markdown and [KaTeX](https://katex.org/)) are out of scope for this project.
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## Examples
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iex> MfmParser.Parser.parse("$[twitch.speed=5s 🍮]")
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[
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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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"""
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def parse(input, tree \\ [], is_end_token \\ fn _ -> false end) do
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case Lexer.next(input) do
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:eof ->
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@ -83,8 +103,65 @@ defmodule MfmParser.Parser do
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end
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defp fill_props(node = %{props: props}, %{content: content}) do
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new_props = props |> Map.merge(Token.MFM.to_props(content))
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new_props = props |> Map.merge(to_props(content))
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node |> Map.merge(%{props: new_props})
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end
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def to_props(opts_string) when is_binary(opts_string) do
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cond do
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opts_string =~ "." ->
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Regex.replace(~r/^.*?\./u, opts_string, "")
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|> String.trim()
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|> String.split(",")
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|> Enum.reduce(%{}, fn opt, acc ->
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acc
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|> Map.merge(
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cond do
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opt =~ "speed" ->
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%{speed: String.replace(opt, "speed=", "")}
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opt =~ "v" ->
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%{v: true}
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opt =~ "h" ->
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%{h: true}
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opt =~ "x" ->
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%{axis: "x"}
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opt =~ "y" ->
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%{axis: "y"}
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opt =~ "left" ->
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%{direction: "left"}
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opt =~ "alternate" ->
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%{direction: "alternate"}
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true ->
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if Regex.match?(~r/^\$\[font/, opts_string) do
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%{font: opt}
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else
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%{}
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end
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end
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)
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end)
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opts_string =~ "$[x" ->
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%{
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size:
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case opts_string |> String.replace("$[x", "") |> String.trim() do
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"2" -> "200%"
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"3" -> "400%"
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"4" -> "600%"
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_ -> "100%"
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end
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}
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true ->
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%{}
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end
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end
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end
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16
lib/token.ex
16
lib/token.ex
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@ -3,3 +3,19 @@ defmodule MfmParser.Token do
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token |> Map.put(:content, content <> new_char)
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end
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end
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defmodule MfmParser.Token.Text do
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defstruct content: ""
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end
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defmodule MfmParser.Token.Newline do
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defstruct content: ""
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end
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defmodule MfmParser.Token.MFM.Open do
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defstruct content: ""
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end
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defmodule MfmParser.Token.MFM.Close do
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defstruct content: ""
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end
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|
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@ -1,58 +0,0 @@
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defmodule MfmParser.Token.MFM do
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def to_props(opts_string) when is_binary(opts_string) do
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cond do
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opts_string =~ "." ->
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Regex.replace(~r/^.*?\./u, opts_string, "")
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|> String.trim()
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|> String.split(",")
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|> Enum.reduce(%{}, fn opt, acc ->
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acc
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|> Map.merge(
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cond do
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opt =~ "speed" ->
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%{speed: String.replace(opt, "speed=", "")}
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opt =~ "v" ->
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%{v: true}
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opt =~ "h" ->
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%{h: true}
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opt =~ "x" ->
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%{axis: "x"}
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opt =~ "y" ->
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||||
%{axis: "y"}
|
||||
|
||||
opt =~ "left" ->
|
||||
%{direction: "left"}
|
||||
|
||||
opt =~ "alternate" ->
|
||||
%{direction: "alternate"}
|
||||
|
||||
true ->
|
||||
if Regex.match?(~r/^\$\[font/, opts_string) do
|
||||
%{font: opt}
|
||||
else
|
||||
%{}
|
||||
end
|
||||
end
|
||||
)
|
||||
end)
|
||||
|
||||
opts_string =~ "$[x" ->
|
||||
%{
|
||||
size:
|
||||
case opts_string |> String.replace("$[x", "") |> String.trim() do
|
||||
"2" -> "200%"
|
||||
"3" -> "400%"
|
||||
"4" -> "600%"
|
||||
_ -> "100%"
|
||||
end
|
||||
}
|
||||
|
||||
true ->
|
||||
%{}
|
||||
end
|
||||
end
|
||||
end
|
||||
|
|
@ -1,3 +0,0 @@
|
|||
defmodule MfmParser.Token.MFM.Close do
|
||||
defstruct content: ""
|
||||
end
|
||||
|
|
@ -1,3 +0,0 @@
|
|||
defmodule MfmParser.Token.MFM.Open do
|
||||
defstruct content: ""
|
||||
end
|
||||
|
|
@ -1,3 +0,0 @@
|
|||
defmodule MfmParser.Token.Newline do
|
||||
defstruct content: ""
|
||||
end
|
||||
|
|
@ -1,3 +0,0 @@
|
|||
defmodule MfmParser.Token.Text do
|
||||
defstruct content: ""
|
||||
end
|
||||
|
|
@ -4,6 +4,8 @@ defmodule MfmParser.EncoderTest do
|
|||
alias MfmParser.Encoder
|
||||
alias MfmParser.Node
|
||||
|
||||
doctest MfmParser.Encoder
|
||||
|
||||
describe "to_html" do
|
||||
test "it handles text" do
|
||||
input_tree = [%Node.Text{props: %{text: "chocolatine"}}]
|
||||
|
|
|
|||
|
|
@ -1,4 +0,0 @@
|
|||
defmodule MfmParserTest do
|
||||
use ExUnit.Case
|
||||
doctest MfmParser
|
||||
end
|
||||
|
|
@ -2,6 +2,8 @@ defmodule MfmParser.ParserTest do
|
|||
use ExUnit.Case
|
||||
alias MfmParser.Parser
|
||||
|
||||
doctest MfmParser.Parser
|
||||
|
||||
describe "single element input" do
|
||||
test "it can handle an empty string as input" do
|
||||
input = ""
|
||||
|
|
@ -586,4 +588,35 @@ defmodule MfmParser.ParserTest do
|
|||
]
|
||||
end
|
||||
end
|
||||
|
||||
describe "to_props/1" do
|
||||
test "it returns speed in the list of parameters" do
|
||||
assert %{speed: "5s"} = Parser.to_props("$[blabla.speed=5s")
|
||||
assert %{speed: "0.5s"} = Parser.to_props("$[blabla.speed=0.5s")
|
||||
end
|
||||
|
||||
test "it returns v and h in the list of parameters" do
|
||||
assert %{v: true} = Parser.to_props("$[blabla.v")
|
||||
assert %{v: true, h: true} = Parser.to_props("$[blabla.h,v")
|
||||
end
|
||||
|
||||
test "it returns fonts" do
|
||||
assert %{font: "some_font"} = Parser.to_props("$[font.some_font")
|
||||
end
|
||||
|
||||
test "it returns a size for an x element" do
|
||||
assert %{size: "200%"} = Parser.to_props("$[x2")
|
||||
assert %{size: "400%"} = Parser.to_props("$[x3")
|
||||
assert %{size: "600%"} = Parser.to_props("$[x4")
|
||||
assert %{size: "100%"} = Parser.to_props("$[xqsdfqsf")
|
||||
end
|
||||
|
||||
test "it returns an empty list when there are no parameters" do
|
||||
assert %{} = Parser.to_props("$[blabla")
|
||||
end
|
||||
|
||||
test "it ignores unknown parameters" do
|
||||
assert %{} = Parser.to_props("$[blabla.idk")
|
||||
end
|
||||
end
|
||||
end
|
||||
|
|
|
|||
|
|
@ -1,34 +0,0 @@
|
|||
defmodule MfmParser.MFMTest do
|
||||
use ExUnit.Case
|
||||
|
||||
alias MfmParser.Token.MFM
|
||||
|
||||
test "it returns speed in the list of parameters" do
|
||||
assert %{speed: "5s"} = MFM.to_props("$[blabla.speed=5s")
|
||||
assert %{speed: "0.5s"} = MFM.to_props("$[blabla.speed=0.5s")
|
||||
end
|
||||
|
||||
test "it returns v and h in the list of parameters" do
|
||||
assert %{v: true} = MFM.to_props("$[blabla.v")
|
||||
assert %{v: true, h: true} = MFM.to_props("$[blabla.h,v")
|
||||
end
|
||||
|
||||
test "it returns fonts" do
|
||||
assert %{font: "some_font"} = MFM.to_props("$[font.some_font")
|
||||
end
|
||||
|
||||
test "it returns a size for an x element" do
|
||||
assert %{size: "200%"} = MFM.to_props("$[x2")
|
||||
assert %{size: "400%"} = MFM.to_props("$[x3")
|
||||
assert %{size: "600%"} = MFM.to_props("$[x4")
|
||||
assert %{size: "100%"} = MFM.to_props("$[xqsdfqsf")
|
||||
end
|
||||
|
||||
test "it returns an empty list when there are no parameters" do
|
||||
assert %{} = MFM.to_props("$[blabla")
|
||||
end
|
||||
|
||||
test "it ignores unknown parameters" do
|
||||
assert %{} = MFM.to_props("$[blabla.idk")
|
||||
end
|
||||
end
|
||||
Loading…
Reference in New Issue