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import { isString } from "../utils"
import { calc } from "./calc"
import type { Token, TokenMiddleware } from "./types"
import { toPx } from "./unit-conversion"
export const addNegativeTokens: TokenMiddleware = {
enforce: "pre",
transform(dictionary) {
const { prefix, allTokens, formatCssVar, formatTokenName, registerToken } =
dictionary
const tokens = allTokens.filter(
({ extensions }) => extensions.category === "spacing",
)
tokens.forEach((token) => {
const originalPath = token.path.slice()
const originalVar = formatCssVar(originalPath, prefix)
if (isString(token.value) && token.value === "0rem") {
return
}
const nextToken = structuredClone(token)
Object.assign(nextToken.extensions, {
negative: true,
prop: `-${token.extensions.prop}`,
originalPath,
})
nextToken.value = calc.negate(originalVar.ref)
const lastPath = nextToken.path[nextToken.path.length - 1]
if (lastPath != null) {
nextToken.path[nextToken.path.length - 1] = `-${lastPath}`
}
if (nextToken.path) {
nextToken.name = formatTokenName(nextToken.path)
}
registerToken(nextToken)
})
},
}
const units = new Set([
"spacing",
"sizes",
"borderWidths",
"fontSizes",
"radii",
])
export const addPixelUnit: TokenMiddleware = {
enforce: "post",
transform(dictionary) {
const tokens = dictionary.allTokens.filter((token) => {
return units.has(token.extensions.category!) && !token.extensions.negative
})
tokens.forEach((token) => {
Object.assign(token.extensions, {
pixelValue: toPx(token.value),
})
})
},
}
export const addVirtualPalette: TokenMiddleware = {
enforce: "post",
transform(dictionary) {
const { allTokens, registerToken, formatTokenName } = dictionary
const tokens = allTokens.filter(
({ extensions }) => extensions.category === "colors",
)
const keys = new Map<string, string[]>()
const colorPalettes = new Map<string, Token[]>()
tokens.forEach((token) => {
const { colorPalette } = token.extensions
if (!colorPalette) return
colorPalette.keys.forEach((keyPath) => {
keys.set(formatTokenName(keyPath), keyPath)
})
colorPalette.roots.forEach((colorPaletteRoot) => {
const name = formatTokenName(colorPaletteRoot)
const colorPaletteList = colorPalettes.get(name) || []
colorPaletteList.push(token)
colorPalettes.set(name, colorPaletteList)
if (token.extensions.default && colorPaletteRoot.length === 1) {
const keyPath = colorPalette.keys[0]?.filter(Boolean)
if (!keyPath.length) return
const path = colorPaletteRoot.concat(keyPath)
keys.set(formatTokenName(path), [])
}
})
})
keys.forEach((segments) => {
const path = ["colors", "colorPalette", ...segments].filter(Boolean)
const name = formatTokenName(path)
const prop = formatTokenName(path.slice(1))
const token: Token = {
name,
value: name,
originalValue: name,
path,
extensions: {
condition: "base",
originalPath: path,
category: "colors",
prop,
virtual: true,
},
}
registerToken(token, "pre")
})
},
}
export const removeEmptyTokens: TokenMiddleware = {
enforce: "post",
transform(dictionary) {
dictionary.allTokens = dictionary.allTokens.filter(
(token) => token.value !== "",
)
},
}
export const tokenMiddlewares = [
addNegativeTokens,
addVirtualPalette,
addPixelUnit,
removeEmptyTokens,
]
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