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css-sweeper from PropJockey

统计信息：字数 5261 阅读11分钟

MineSweeper implemented in CSS + HTML using the Space Toggle trick (no JavaScript!)

PLAY IT HERE!

NOTE: this is another stress test, expect lag for the next several years of average computer advancement!

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Win Condition

Since it's not practical to clear all the spaces when you expose an empty area (without loops or causing cyclic references), the win condition has been reduced to:

  1. Flag all the bombs
  2. Do not flag non-bombs
  3. Clear all non-bomb spaces

This also allows you to win when it comes down to a forced-guess since you can flag without consequence. If you pick right and haven't flagged any non-bombs, you win.

Mine Field Generation

The fields are only defined by where the bombs are (and that those spaces are not not-bombs).

The rest of the game, counter, numbers, etc flow from there, so the bombs can be placed anywhere, and in any number.

This is the (lazy/inefficient) script I ran before hand to generate the 16 included Fields:

var levels = [{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}]
var genlvl = (lvl) => {
  var y = ~~(Math.random() * 16)
  var x = ~~(Math.random() * 30)
  var key = `bomb-${y}-${x}`
  lvl[key] = `--${key}: ; --not-${key}: initial;`
}
levels.forEach(lvl => {
  while (Object.keys(lvl).length < 99) { genlvl(lvl) }
})
var cssoutput = ""
levels.forEach((lvl, i) => {
  var out = `    #level-${ i.toString(10).padStart(2, "0") }:checked ~ #ram {
      --level: "${ (i + 1).toString(10).padStart(2, "0") }";
      ${Object.values(lvl).join("\n      ")}
    }
`
  cssoutput += out
})
// cssoutput is the only css necessary to create new fields

CSS is a programming language thanks to the Space Toggle trick

Basics of Space Toggle:

  • if your --css-var holds a space
--toggler: ;

, then it can be added to anything (any number of times) without changing the value

  --toggler: ;
  --red-if-toggler: var(--toggler) red;
  background: var(--red-if-toggler, green); /* will be red! */
  • if your --css-var holds
initial

--toggler: initial;

(or was never defined), then it can be added to anything to force-fallback when referenced

  --toggler: initial;
  --red-if-toggler: var(--toggler) red;
  background: var(--red-if-toggler, green); /* will be green! */
  • Space Toggles can be combined for AND logic:
  --red-if-togglersalltrue: var(--tog1) var(--tog2) var(--tog3) red;
  • Space Toggles can be combined for OR logic:
  --red-if-anytogglertrue: var(--tog1, var(--tog2, var(--tog3))) red;
  • Checkboxes (and radio buttons) make a great source for space toggles (shout out to

@RockStarwind

for that idea)

  #common-css-var-area { /* default any "not" values to truthy */ --not-flagged: ; }
  #mycheckbox:checked ~ #common-css-var-area { --flagged: ; --not-flagged: initial; }
  #anotherbox:checked ~ #common-css-var-area { --open: ; }
  #common-css-var-area {
    --yellow-if-flagged-and-open: var(--open) var(--flagged) yellow;
    --white-if-not-flagged-and-open: var(--open) var(--not-flagged) white;
    --red-if-flagged: var(--flagged) red;
    color: var(--yellow-if-flagged-and-open, var(--white-if-not-flagged-and-open, var(--red-if-flagged, black)))
  }
  /* color will be black if not flagged and not open */

For reference, here's where Space Toggle has been discussed recently:

Space Toggle has been independently discoverd a handful of times:

  • @anatudor probably the first to discover it - about 3 years ago!
  • @JamesOx57 in April 2020 which kickstarted development of augmented-ui v2 because it allows augs to be equipped without extra class names.
  • @DavidKPiano in June 2020 and instead of just space, he includes an empty comment --pnl: /**/; and calls it prop-and-lock

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Last update: November 9, 2024