Initial commit

.gitignore

@@ -0,0 +1,2 @@
+node_modules
+yarn-error.log

package-lock.json

@@ -0,0 +1,109 @@
+{
+  "name": "unitfile-parser",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
+    "brace-expansion": {
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+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
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+      "dev": true,
+      "requires": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "chevrotain": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/chevrotain/-/chevrotain-7.0.3.tgz",
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+      "requires": {
+        "regexp-to-ast": "0.5.0"
+      }
+    },
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+      "version": "0.0.1",
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+    },
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+      "dev": true,
+      "requires": {
+        "fs.realpath": "^1.0.0",
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "^3.0.4",
+        "once": "^1.3.0",
+        "path-is-absolute": "^1.0.0"
+      }
+    },
+    "inflight": {
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+    },
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+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
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+      "requires": {
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+      }
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+      "dev": true
+    },
+    "regexp-to-ast": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/regexp-to-ast/-/regexp-to-ast-0.5.0.tgz",
+      "integrity": "sha512-tlbJqcMHnPKI9zSrystikWKwHkBqu2a/Sgw01h3zFjvYrMxEDYHzzoMZnUrbIfpTFEsoRnnviOXNCzFiSc54Qw=="
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    }
+  }
+}

package.json

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+{
+  "name": "unitfile-parser",
+  "version": "1.0.0",
+  "description": "Parse systemd unit files",
+  "main": "src/mod.mjs",
+  "type": "module",
+  "scripts": {
+    "test": "node ./test/spec.mjs './test/examples/*.mjs'"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "chevrotain": "^7.0.3"
+  },
+  "devDependencies": {
+    "glob": "^7.1.6"
+  }
+}

src/Lexer.mjs

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+import chevrotain from "chevrotain";
+const { createToken, Lexer } = chevrotain; 
+
+function getValueParser(...stoppers) {
+  return function exec(text, startOffset) { 
+    for (let i = startOffset; i < text.length; i += 1) {
+      if (text[i] === '\\') {
+        i += 1;
+        continue;
+      }
+
+      if (stoppers.includes(text[i])) {
+        if (i !== startOffset) {
+          return [text.substring(startOffset, i)]; 
+        } else {
+          return null;
+        }
+      }
+    }
+
+    return [text.substr(startOffset)]; 
+  }
+}
+
+export const SectionHeading = createToken({
+  name: "SectionHeading",
+  pattern: /\[[A-z]+\]/,
+});
+export const Property = createToken({
+  name: "Property",
+  pattern: /[A-z][A-z]+=/,
+  push_mode: "value_mode",
+});
+export const Value = createToken({
+  name: "Value",
+  pattern: { exec: getValueParser('\n', '#') },
+  line_breaks: true,
+  pop_mode: true,
+});
+export const CommentStart = createToken({
+  name: "CommentStart",
+  pattern: '#',
+  push_mode: "comment_mode",
+});
+export const Comment = createToken({
+  name: "Comment",
+  pattern: { exec: getValueParser('\n') },
+  line_breaks: true,
+  pop_mode: true,
+});
+export const WhiteSpace = createToken({
+  name: "WhiteSpace",
+  pattern: /\s+/,
+  group: Lexer.SKIPPED,
+});
+
+export const tokens = [
+  CommentStart,
+  Value,
+  Comment,
+  SectionHeading,
+  Property,
+  WhiteSpace,
+];
+
+export default new Lexer({
+  defaultMode: "line_mode",
+  modes: {
+    line_mode: [
+      CommentStart,
+      SectionHeading,
+      Property,
+      WhiteSpace,
+    ],
+    value_mode: [ Value ],
+    comment_mode: [ Comment ],
+  },
+});

src/Parser.mjs

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+import chevrotain from "chevrotain";
+const { CstParser } = chevrotain; 
+import {
+  tokens,
+  Comment,
+  CommentStart,
+  Property,
+  SectionHeading,
+  Value,
+} from "./Lexer.mjs";
+
+export default class UnitFileParser extends CstParser {
+  constructor() {
+    super(tokens);
+    const $ = this;
+
+    $.RULE("comment", () => {
+      $.CONSUME(CommentStart);
+      $.CONSUME(Comment);
+    });
+
+    $.RULE("value", () => {
+      $.CONSUME(Value);
+    });
+
+    $.RULE("sectionHeadingStatement", () => {
+      $.CONSUME(SectionHeading);
+      $.OPTION(() => {
+        $.SUBRULE($.comment);
+      });
+    });
+
+    $.RULE("propertyStatement", () => {
+      $.CONSUME(Property);
+      $.SUBRULE($.value);
+      $.OPTION(() => {
+        $.SUBRULE($.comment);
+      });
+    });
+
+    $.RULE("sectionStatement", () => {
+      $.OR([
+        { ALT: () => $.SUBRULE($.propertyStatement) },
+        { ALT: () => $.SUBRULE($.comment) },
+      ]);
+    });
+    
+    $.RULE("section", () => {
+      $.SUBRULE($.sectionHeadingStatement);
+      $.MANY(() => {
+        $.SUBRULE($.sectionStatement);
+      });
+    });
+
+    $.RULE("unitFile", () => {
+      $.MANY(() => {
+        $.OR([
+          { ALT: () => $.SUBRULE($.section) },
+          { ALT: () => $.SUBRULE($.comment) },
+        ]);
+      });
+    });
+
+    this.performSelfAnalysis();
+  }
+}

src/mod.mjs

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+export { default as Lexer } from "./Lexer.mjs";
+export { default as Parser } from "./Parser.mjs";
+export { default as visitorCreator } from "./visitor.mjs";

src/visitor.mjs

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+export default (parser) => {
+  const BaseSQLVisitorWithDefaults = parser.getBaseCstVisitorConstructorWithDefaults();
+
+  return class UnitFileVisitor extends BaseSQLVisitorWithDefaults {
+    constructor() {
+      super();
+      this.validateVisitor();
+    };
+
+    comment(ctx) {
+      return {
+        type: "comment",
+        value: ctx.Comment.map(({ image }) => image.replace(/^\s/, '').replace(/\s$/, '')).join(''),
+      };
+    }
+
+    propertyStatement(ctx) {
+      const name = ctx.Property[0].image;
+      return {
+        type: "setting",
+        name: name.substring(0, name.length - 1),
+        value: ctx.value.map(v => v.children.Value.map(({ image }) => image.replace(/\s$/, '')).join('')).join(''),
+        comment: this.visit(ctx.comment?.[0]),
+      };
+    }
+
+    sectionStatement(ctx) {
+      const content = ctx.propertyStatement?.[0] || ctx.comment?.[0];
+      return this.visit(content);
+    }
+
+    section(ctx) {
+      const titleString = ctx.sectionHeadingStatement[0].children.SectionHeading[0].image;
+      const titleComment = this.visit(ctx.sectionHeadingStatement[0].children.comment?.[0])
+      return {
+        type: "section",
+        title: titleString.substring(1, titleString.length - 1),
+        titleComment, 
+        body: ctx.sectionStatement?.map(this.visit.bind(this)) || [],
+      };
+    }
+
+    unitFile(ctx) {
+      const comments = ctx.comment?.map(comment => this.visit(comment)) || [];
+      const sections = ctx.section?.map(section => this.visit(section)) || [];
+      return {
+        type: "unitFile", 
+        comments,
+        sections,
+      };
+    }
+  };
+};

test/examples/basic.mjs

@@ -0,0 +1,21 @@
+export const content = `[Unit]
+Description=Idle manager for Wayland`;
+
+export const result = {
+  type: 'unitFile',
+  comments: [],
+  sections: [
+    {
+      type: 'section',
+      title: 'Unit',
+      titleComment: undefined,
+      body: [
+        {
+          type: 'setting',
+          name: 'Description',
+          value: 'Idle manager for Wayland'
+        }
+      ]
+    }
+  ]
+};

test/examples/blueman-tray.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=a status icon application for blueman
+Documentation=man:blueman-tray(1)
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/blueman-tray
+
+[Install]
+WantedBy=sway-session.target

test/examples/comment-only.mjs

@@ -0,0 +1,7 @@
+export const content = `# Start of file comment`;
+
+export const result = {
+  type: 'unitFile',
+  comments: [ { type: 'comment', value: 'Start of file comment' } ],
+  sections: []
+};

test/examples/comments.mjs

@@ -0,0 +1,50 @@
+export const content = `# Outside comment
+[Unit] # Heading comment
+# Inline comment
+Description=Idle manager for Wayland # End of value comment
+ExecStart=echo\
+  "some string" # End of value comment
+Alias=asdf#Comment Without spaces
+
+[Install]
+# Comment only in this body
+`;
+
+export const result = {
+  type: 'unitFile',
+  comments: [ { type: 'comment', value: 'Outside comment' } ],
+  sections: [
+    {
+      type: 'section',
+      title: 'Unit',
+      titleComment: { type: 'comment', value: 'Heading comment' },
+      body: [
+        { type: 'comment', value: 'Inline comment' },
+        {
+          type: 'setting',
+          name: 'Description',
+          value: 'Idle manager for Wayland',
+          comment: { type: 'comment', value: 'End of value comment' }
+        },
+        {
+          type: 'setting',
+          name: 'ExecStart',
+          value: 'echo  "some string"',
+          comment: { type: 'comment', value: 'End of value comment' }
+        },
+        {
+          type: 'setting',
+          name: 'Alias',
+          value: 'asdf',
+          comment: { type: 'comment', value: 'Comment Without spaces' }
+        }
+      ]
+    },
+    {
+      type: 'section',
+      title: 'Install',
+      titleComment: { type: 'comment', value: 'Comment only in this body' },
+      body: []
+    }
+  ]
+};

test/examples/gammastep.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=set color temperature of display according to time of day
+Documentation=man:gammastep(1)
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+ExecStart=/sbin/gammastep -l geoclue2 -m wayland -v
+
+[Install]
+WantedBy=sway-session.target

test/examples/keepassxc.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Keepassxc
+
+[Service]
+Type=simple
+ExecStart=keepassxc
+ExecReload=/bin/kill -HUP $MAINPID
+KillMode=process
+Restart=on-failure
+
+[Install]
+WantedBy=default.target

test/examples/libinput-gestures.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Actions gestures on your touchpad using libinput
+Documentation=https://github.com/bulletmark/libinput-gestures
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+ExecStart=python3 /usr/bin/libinput-gestures
+
+[Install]
+WantedBy=sway-session.target

test/examples/mako.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=A lightweight Wayland notification daemon
+Documentation=man:mako(1)
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/mako
+
+[Install]
+WantedBy=sway-session.target

test/examples/multiline-value.mjs

@@ -0,0 +1,48 @@
+export const content = `
+[Service]
+ExecStart=/usr/bin/swayidle -w \\
+          timeout 600 'swaylock-bg' \\
+          timeout 900 'swaymsg "output * dpms off"' \\
+               resume 'swaymsg "output * dpms on"' \\
+          after-resume 'swaylock-bg'
+ExecStop=/usr/bin/swayidle -w \\
+          after-resume 'swaylock-bg' # Comment at the end
+ExecPause=/usr/bin/swayidle -w \\
+          after-resume 'swaylock-bg'#No space comment
+`;
+
+export const result = {
+  type: 'unitFile',
+  comments: [],
+  sections: [
+    {
+      type: 'section',
+      title: 'Service',
+      titleComment: undefined,
+      body: [
+        {
+          type: 'setting',
+          name: 'ExecStart',
+          value: '/usr/bin/swayidle -w \\\n' +
+            "          timeout 600 'swaylock-bg' \\\n" +
+            `          timeout 900 'swaymsg "output * dpms off"' \\\n` +
+            `               resume 'swaymsg "output * dpms on"' \\\n` +
+            "          after-resume 'swaylock-bg'",
+          comment: undefined
+        },
+        {
+          type: 'setting',
+          name: 'ExecStop',
+          value: "/usr/bin/swayidle -w \\\n          after-resume 'swaylock-bg'",
+          comment: { type: 'comment', value: 'Comment at the end' }
+        },
+        {
+          type: 'setting',
+          name: 'ExecPause',
+          value: "/usr/bin/swayidle -w \\\n          after-resume 'swaylock-bg'",
+          comment: { type: 'comment', value: 'No space comment' }
+        }
+      ]
+    }
+  ]
+};

test/examples/nextcloud.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Nextcloud Client
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/nextcloud --background
+ExecReload=/bin/kill -HUP $MAINPID
+KillMode=process
+Restart=on-failure
+
+[Install]
+WantedBy=default.target

test/examples/nm-applet.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=network monitor and control GUI applet
+Documentation=man:nm-applet(1)
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/nm-applet --indicator
+
+[Install]
+WantedBy=sway-session.target

test/examples/polkit-gnome-authentication-agent.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Legacy polkit authentication agent for GNOME
+Documentation=https://gitlab.freedesktop.org/polkit/polkit/
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+ExecStart=/usr/lib/polkit-gnome/polkit-gnome-authentication-agent-1
+
+[Install]
+WantedBy=sway-session.target

test/examples/repeated-settings.mjs

@@ -0,0 +1,36 @@
+export const content = `[Install]
+After=something.service
+After=something-else.service
+After=something-different.service`;
+
+export const result = {
+  type: 'unitFile',
+  comments: [],
+  sections: [
+    {
+      type: 'section',
+      title: 'Install',
+      titleComment: undefined,
+      body: [
+        {
+          type: 'setting',
+          name: 'After',
+          value: 'something.service',
+          comment: undefined
+        },
+        {
+          type: 'setting',
+          name: 'After',
+          value: 'something-else.service',
+          comment: undefined
+        },
+        {
+          type: 'setting',
+          name: 'After',
+          value: 'something-different.service',
+          comment: undefined
+        }
+      ]
+    }
+  ]
+};

test/examples/scream-ivshmem-pulse.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Scream IVSHMEM pulse reciever
+After=pulseaudio.service
+Wants=pulseaudio.service
+
+[Service]
+Type=simple
+ExecStartPre=/usr/bin/truncate -s 0 /dev/shm/scream-ivshmem
+ExecStartPre=/usr/bin/dd if=/dev/zero of=/dev/shm/scream-ivshmem bs=1M count=2
+ExecStart=/usr/bin/scream -m /dev/shm/scream-ivshmem
+
+[Install]
+WantedBy=default.target

test/examples/sway.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=sway - SirCmpwn's Wayland window manager
+Documentation=man:sway(5)
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+EnvironmentFile=-%h/.config/sway/env
+ExecStart=/usr/bin/sway -d
+Restart=on-failure
+RestartSec=1
+TimeoutStopSec=10

test/examples/swayidle.service

@@ -0,0 +1,18 @@
+# Start of file comment
+[Unit] # Title comment
+Description=Idle manager for Wayland
+Documentation=man:swayidle(1)
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/swayidle -w \
+          timeout 600 'swaylock-bg' \
+          timeout 900 'swaymsg "output * dpms off"' \
+               resume 'swaymsg "output * dpms on"' \
+          after-resume 'swaylock-bg'
+
+[Install]
+WantedBy=sway-session.target

test/examples/waybar.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Highly customizable Wayland bar for Sway and Wlroots based compositors.
+Documentation=https://github.com/Alexays/Waybar/wiki/
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/waybar
+
+[Install]
+WantedBy=sway-session.target

test/examples/weird-characters.mjs

@@ -0,0 +1,22 @@
+export const content = `[Install]
+Description=Test description(1) https://something/? \\# # test`;
+
+export const result = {
+  type: 'unitFile',
+  comments: [],
+  sections: [
+    {
+      type: 'section',
+      title: 'Install',
+      titleComment: undefined,
+      body: [
+        {
+          type: 'setting',
+          name: 'Description',
+          value: 'Test description(1) https://something/? \\#',
+          comment: { type: 'comment', value: 'test' }
+        }
+      ]
+    }
+  ]
+};

test/examples/xdg-desktop-portal-wlr.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Portal service (wlroots implementation)
+PartOf=graphical-session.target
+After=graphical-session.target
+
+[Service]
+Type=dbus
+BusName=org.freedesktop.impl.portal.desktop.wlr
+ExecStart=/usr/lib/xdg-desktop-portal-wlr
+Restart=on-failure

test/examples/xdg-desktop-portal.service

@@ -0,0 +1,7 @@
+[Unit]
+Description=Portal service
+
+[Service]
+Type=dbus
+BusName=org.freedesktop.portal.Desktop
+ExecStart=/usr/lib/xdg-desktop-portal

test/examples/xsettingsd.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=X Settings Daemon
+Documentation=https://github.com/derat/xsettingsd/wiki/Installation
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/xsettingsd
+ExecStop=/usr/bin/env pkill xsettingsd
+
+[Install]
+WantedBy=sway-session.target

test/examples/ydotool.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=ydotool - Generic command-line automation tool (no X!)
+Documentation=https://github.com/ReimuNotMoe/ydotool
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/ydotoold
+Restart=on-failure
+RestartSec=1
+TimeoutStopSec=10
+
+[Install]
+WantedBy=sway-session.target

test/spec.mjs

@@ -0,0 +1,79 @@
+import glob from "glob";
+import { join } from "path";
+import {
+  Lexer,
+  Parser,
+  visitorCreator,
+} from "../src/mod.mjs";
+
+const runTest = (input) => {
+  const parser = new Parser([], { outputCst: true });
+  const lexingresult = Lexer.tokenize(input);
+
+  if (lexingresult.errors.length > 0) {
+    console.dir(lexingresult, { depth: Infinity });
+    throw new Error("Lexing errors detected")
+  }
+
+  parser.input = lexingresult.tokens;
+  const cst = parser.unitFile();
+
+  if (parser.errors.length > 0) {
+    console.dir(parser.errors, { depth: Infinity });
+    throw new Error("Parsing errors detected")
+  }
+
+  const Visitor = visitorCreator(parser);
+  const visitor = new Visitor();
+  const ast = visitor.visit(cst);
+  return ast;
+};
+
+(async () => {
+  const files = await Promise.all(
+    process.argv
+      .slice(2)
+      .map(arg => new Promise(
+        (resolve, reject) => glob(arg, {}, (err, files) => {
+          if (err) {
+            reject(err);
+          } else {
+            resolve(files.map(file => join(process.cwd(), file)));
+          }
+        })
+      ))
+  );
+
+  const cases = await Promise.all(files.flat().map(file => import(file)));
+
+  const results = cases.map(
+    ({ content, result }) => {
+      const ast = runTest(content);
+      const resultString = JSON.stringify(ast);
+      const expectedString = JSON.stringify(result);
+      if (resultString !== expectedString) {
+        console.dir(ast, { depth: Infinity });
+        throw new Error(`Mismatching result on testcase:
+${content}
+
+=======Result======
+
+${resultString}
+
+=======Expected======
+
+${expectedString}
+
+`);
+      }
+
+      return null;
+    },
+  )
+  .filter(r => r !== null);
+  
+  if (results.length) {
+    results.forEach(err => console.error(err));
+    throw new Error(`${results.length} failed tests`);
+  }
+})();