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evaluateTailwindFunctions.js
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evaluateTailwindFunctions.js
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import dlv from 'dlv'
import didYouMean from 'didyoumean'
import transformThemeValue from '../util/transformThemeValue'
import parseValue from 'postcss-value-parser'
import { normalizeScreens } from '../util/normalizeScreens'
import buildMediaQuery from '../util/buildMediaQuery'
import { toPath } from '../util/toPath'
function isObject(input) {
return typeof input === 'object' && input !== null
}
function findClosestExistingPath(theme, path) {
let parts = toPath(path)
do {
parts.pop()
if (dlv(theme, parts) !== undefined) break
} while (parts.length)
return parts.length ? parts : undefined
}
function pathToString(path) {
if (typeof path === 'string') return path
return path.reduce((acc, cur, i) => {
if (cur.includes('.')) return `${acc}[${cur}]`
return i === 0 ? cur : `${acc}.${cur}`
}, '')
}
function list(items) {
return items.map((key) => `'${key}'`).join(', ')
}
function listKeys(obj) {
return list(Object.keys(obj))
}
function validatePath(config, path, defaultValue) {
const pathString = Array.isArray(path)
? pathToString(path)
: path.replace(/^['"]+/g, '').replace(/['"]+$/g, '')
const pathSegments = Array.isArray(path) ? path : toPath(pathString)
const value = dlv(config.theme, pathSegments, defaultValue)
if (value === undefined) {
let error = `'${pathString}' does not exist in your theme config.`
const parentSegments = pathSegments.slice(0, -1)
const parentValue = dlv(config.theme, parentSegments)
if (isObject(parentValue)) {
const validKeys = Object.keys(parentValue).filter(
(key) => validatePath(config, [...parentSegments, key]).isValid
)
const suggestion = didYouMean(pathSegments[pathSegments.length - 1], validKeys)
if (suggestion) {
error += ` Did you mean '${pathToString([...parentSegments, suggestion])}'?`
} else if (validKeys.length > 0) {
error += ` '${pathToString(parentSegments)}' has the following valid keys: ${list(
validKeys
)}`
}
} else {
const closestPath = findClosestExistingPath(config.theme, pathString)
if (closestPath) {
const closestValue = dlv(config.theme, closestPath)
if (isObject(closestValue)) {
error += ` '${pathToString(closestPath)}' has the following keys: ${listKeys(
closestValue
)}`
} else {
error += ` '${pathToString(closestPath)}' is not an object.`
}
} else {
error += ` Your theme has the following top-level keys: ${listKeys(config.theme)}`
}
}
return {
isValid: false,
error,
}
}
if (
!(
typeof value === 'string' ||
typeof value === 'number' ||
typeof value === 'function' ||
value instanceof String ||
value instanceof Number ||
Array.isArray(value)
)
) {
let error = `'${pathString}' was found but does not resolve to a string.`
if (isObject(value)) {
let validKeys = Object.keys(value).filter(
(key) => validatePath(config, [...pathSegments, key]).isValid
)
if (validKeys.length) {
error += ` Did you mean something like '${pathToString([...pathSegments, validKeys[0]])}'?`
}
}
return {
isValid: false,
error,
}
}
const [themeSection] = pathSegments
return {
isValid: true,
value: transformThemeValue(themeSection)(value),
}
}
function extractArgs(node, vNodes, functions) {
vNodes = vNodes.map((vNode) => resolveVNode(node, vNode, functions))
let args = ['']
for (let vNode of vNodes) {
if (vNode.type === 'div' && vNode.value === ',') {
args.push('')
} else {
args[args.length - 1] += parseValue.stringify(vNode)
}
}
return args
}
function resolveVNode(node, vNode, functions) {
if (vNode.type === 'function' && functions[vNode.value] !== undefined) {
let args = extractArgs(node, vNode.nodes, functions)
vNode.type = 'word'
vNode.value = functions[vNode.value](node, ...args)
}
return vNode
}
function resolveFunctions(node, input, functions) {
return parseValue(input)
.walk((vNode) => {
resolveVNode(node, vNode, functions)
})
.toString()
}
let nodeTypePropertyMap = {
atrule: 'params',
decl: 'value',
}
export default function ({ tailwindConfig: config }) {
let functions = {
theme: (node, path, ...defaultValue) => {
const { isValid, value, error } = validatePath(
config,
path,
defaultValue.length ? defaultValue : undefined
)
if (!isValid) {
throw node.error(error)
}
return value
},
screen: (node, screen) => {
screen = screen.replace(/^['"]+/g, '').replace(/['"]+$/g, '')
let screens = normalizeScreens(config.theme.screens)
let screenDefinition = screens.find(({ name }) => name === screen)
if (!screenDefinition) {
throw node.error(`The '${screen}' screen does not exist in your theme.`)
}
return buildMediaQuery(screenDefinition)
},
}
return (root) => {
root.walk((node) => {
let property = nodeTypePropertyMap[node.type]
if (property === undefined) {
return
}
node[property] = resolveFunctions(node, node[property], functions)
})
}
}