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oikos/web/node_modules/@csstools/css-calc/README.md
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feat: Phase 1 — extract the client (web SPA + desktop) to dtoro/oikos-web
Problem: the hexagonal refactor churns the backend tree for nine more
phases; the UI delivery stack (web/ SPA, cmd/desktop Wails wrapper,
compose/web image) must move to its own repo first so doc/layout
rewrites land once on a backend-only tree.

Change:
- New repo git.hubris.network/dtoro/oikos-web (v0.33.0): web/, desktop/
  (updateURL repointed to oikos-web releases), compose/, own CI (web +
  desktop jobs), own deploy script (CI-green gate, TOCTOU guard,
  version-tagged images, prune-to-3), own webhook receiver on :9798 +
  launchd unit, own compose project publishing the same 8091:80.
- Cutover executed on mac-mini in order: oikos stack's web service
  stopped+removed, oikos-web project brought up on 8091; outer Caddy
  untouched (targets the published port) — serving + Authentik flow +
  /wails 404 quirk verified post-cutover.
- Stripped from oikos: web/, cmd/desktop/, compose/web/, desktop CI
  workflow, ci.yml web job, Makefile ui/desktop/desktop-package/install
  targets, the compose web service, oikos-web from deploy.sh's fallback
  prune list; wails + go-keyring dropped from go.mod, vendor synced.
- README / CONTRIBUTING / AGENTS.md / .agents dev+operations docs now
  point at the new repo; mbse + mascot design docs carry a path note.

Risk: production SPA serving depends on the new pipeline now; rollback
is versioned-image re-up of the old web service from a pre-split
checkout (port 8091). Desktop builds installed before the split still
check dtoro/oikos releases — one manual reinstall, noted in the
oikos-web release notes.

Verification: go vet, make test (race), make generate-check, golangci
(no new findings; baseline down 400→365); post-cutover curls —
localhost:8091 200, /wails/runtime.js 404, outer Caddy 302 Authentik.
2026-08-15 22:27:52 +02:00

3.6 KiB

CSS Calc for CSS

npm version Build Status Discord

Implemented from : https://drafts.csswg.org/css-values-4/ on 2023-02-17

Usage

Add CSS calc to your project:

npm install @csstools/css-calc @csstools/css-parser-algorithms @csstools/css-tokenizer --save-dev

With string values :

import { calc } from '@csstools/css-calc';

// '20'
console.log(calc('calc(10 * 2)'));

With component values :

import { stringify, tokenizer } from '@csstools/css-tokenizer';
import { parseCommaSeparatedListOfComponentValues } from '@csstools/css-parser-algorithms';
import { calcFromComponentValues } from '@csstools/css-calc';

const t = tokenizer({
	css: 'calc(10 * 2)',
});

const tokens = [];

{
	while (!t.endOfFile()) {
		tokens.push(t.nextToken());
	}

	tokens.push(t.nextToken()); // EOF-token
}

const result = parseCommaSeparatedListOfComponentValues(tokens, {});

// filter or mutate the component values

const calcResult = calcFromComponentValues(result, { precision: 5, toCanonicalUnits: true });

// filter or mutate the component values even further

const calcResultStr = calcResult.map((componentValues) => {
	return componentValues.map((x) => stringify(...x.tokens())).join('');
}).join(',');

// '20'
console.log(calcResultStr);

Options

precision :

The default precision is fairly high. It aims to be high enough to make rounding unnoticeable in the browser.

You can set it to a lower number to suit your needs.

import { calc } from '@csstools/css-calc';

// '0.3'
console.log(calc('calc(1 / 3)', { precision: 1 }));
// '0.33'
console.log(calc('calc(1 / 3)', { precision: 2 }));

globals :

Pass global values as a map of key value pairs.

Example : Relative color syntax (lch(from pink calc(l / 2) c h)) exposes color channel information as ident tokens. By passing globals for l, c and h it is possible to solve nested calc()'s.

import { calc } from '@csstools/css-calc';

const globals = new Map([
	['a', '10px'],
	['b', '2rem'],
]);

// '20px'
console.log(calc('calc(a * 2)', { globals: globals }));
// '6rem'
console.log(calc('calc(b * 3)', { globals: globals }));

toCanonicalUnits :

By default this package will try to preserve units. The heuristic to do this is very simplistic. We take the first unit we encounter and try to convert other dimensions to that unit.

This better matches what users expect from a CSS dev tool.

If you want to have outputs that are closes to CSS serialized values you can pass toCanonicalUnits: true.

import { calc } from '@csstools/css-calc';

// '20hz'
console.log(calc('calc(0.01khz + 10hz)', { toCanonicalUnits: true }));

// '20hz'
console.log(calc('calc(10hz + 0.01khz)', { toCanonicalUnits: true }));

// '0.02khz' !!!
console.log(calc('calc(0.01khz + 10hz)', { toCanonicalUnits: false }));

// '20hz'
console.log(calc('calc(10hz + 0.01khz)', { toCanonicalUnits: false }));