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mirror of https://github.com/primer/css.git synced 2024-11-30 11:17:05 +03:00
css/script/analyze-variables.js
Jon Rohan be518b8023
Updating deprecations.js file to be more straightforward (#1581)
* Updating deprecations.js file to be more straightforward

* Create poor-coins-fix.md

* Remove tests

* Adding more info about the deprecation to the doc

* Title section

* Moving data to deprecations.json

* Moving data to deprecations.json

* Lint only scss files
2021-09-10 10:54:26 -07:00

98 lines
2.8 KiB
JavaScript
Executable File

#!/usr/bin/env node
import postcss from 'postcss'
import {join} from 'path'
import fs from 'fs'
import atImport from 'postcss-import'
import syntax from 'postcss-scss'
import calc from 'postcss-calc'
import simpleVars from 'postcss-simple-vars'
import { dirname } from 'path';
import { fileURLToPath } from 'url';
const __dirname = dirname(fileURLToPath(import.meta.url));
const processor = postcss([
atImport({path: ['src']}),
collectVariables(),
simpleVars({includePaths: [join(__dirname, '../src/support/variables')]})
])
async function analyzeVariables(fileName) {
const contents = fs.readFileSync(fileName, 'utf8')
const result = await processor.process(contents, {from: fileName, map: false, syntax})
for (const message of result.messages) {
if (message.plugin === 'postcss-simple-vars' && message.type === 'variable') {
if (!result.variables[`$${message.name}`].values.includes(message.value)) {
result.variables[`$${message.name}`].values.push(message.value)
}
let computed = message.value
try {
const c = `--temp-property: calc(${message.value})`.replace('round(', '(')
computed = postcss().use(calc()).process(c).css
computed = computed.replace('--temp-property: ', '')
} catch (e) {
// Couldn't calculate because value might not be a number
}
result.variables[`$${message.name}`].computed = computed
}
}
return result.variables
}
function checkNode(node) {
const allowedFuncts = ['var', 'round', 'cubic-bezier']
const functMatch = node.value.match(/([^\s]*)\(/)
let approvedMatch = true
if (functMatch && !allowedFuncts.includes(functMatch[1])) {
approvedMatch = false
}
return node.variable && approvedMatch
}
function collectVariables() {
return {
postcssPlugin: 'prepare-contents',
prepare(result) {
const variables = {}
return {
AtRule(atRule) {
atRule.remove()
},
Comment(comment) {
comment.remove()
},
Declaration(node) {
if (checkNode(node)) {
node.value = node.value.replace(' !default', '')
const fileName = node.source.input.file.replace(`${process.cwd()}/`, '')
variables[node.prop] = {
// computed: value,
values: [node.value],
source: {
path: fileName,
line: node.source.start.line
}
}
} else {
node.remove()
}
},
OnceExit() {
result.variables = variables
}
}
}
}
}
export default analyzeVariables
;(async () => {
const args = process.argv.slice(2)
const file = args.length ? args.shift() : 'src/support/index.scss'
const variables = await analyzeVariables(file)
JSON.stringify(variables, null, 2)
})()