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type BindingMetadata,
NodeTypes,
type SimpleExpressionNode,
createRoot,
createSimpleExpression,
createTransformContext,
processExpression,
} from '@vue/compiler-dom'
import type { SFCDescriptor } from '../parse'
import type { PluginCreator } from 'postcss'
import hash from 'hash-sum'
import { getEscapedCssVarName } from '@vue/shared'
export const CSS_VARS_HELPER = `useCssVars`
export function genCssVarsFromList(
vars: string[],
id: string,
isProd: boolean,
isSSR = false,
): string {
return `{\n ${vars
.map(
key =>
// The `:` prefix here is used in `ssrRenderStyle` to distinguish whether
// a custom property comes from `ssrCssVars`. If it does, we need to reset
// its value to `initial` on the component instance to avoid unintentionally
// inheriting the same property value from a different instance of the same
// component in the outer scope.
`"${isSSR ? `:--` : ``}${genVarName(id, key, isProd, isSSR)}": (${key})`,
)
.join(',\n ')}\n}`
}
function genVarName(
id: string,
raw: string,
isProd: boolean,
isSSR = false,
): string {
if (isProd) {
// hash must not start with a digit to comply with CSS custom property naming rules
return hash(id + raw).replace(/^\d/, r => `v${r}`)
} else {
// escape ASCII Punctuation & Symbols
// #7823 need to double-escape in SSR because the attributes are rendered
// into an HTML string
return `${id}-${getEscapedCssVarName(raw, isSSR)}`
}
}
function normalizeExpression(exp: string) {
exp = exp.trim()
if (
(exp[0] === `'` && exp[exp.length - 1] === `'`) ||
(exp[0] === `"` && exp[exp.length - 1] === `"`)
) {
return exp.slice(1, -1)
}
return exp
}
const vBindRE = /v-bind\s*\(/g
export function parseCssVars(sfc: SFCDescriptor): string[] {
const vars: string[] = []
sfc.styles.forEach(style => {
let match
// ignore v-bind() in comments, eg /* ... */
// and // (Less, Sass and Stylus all support the use of // to comment)
const content = style.content.replace(/\/\*([\s\S]*?)\*\/|\/\/.*/g, '')
while ((match = vBindRE.exec(content))) {
const start = match.index + match[0].length
const end = lexBinding(content, start)
Eif (end !== null) {
const variable = normalizeExpression(content.slice(start, end))
if (!vars.includes(variable)) {
vars.push(variable)
}
}
}
})
return vars
}
enum LexerState {
inParens,
inSingleQuoteString,
inDoubleQuoteString,
}
function lexBinding(content: string, start: number): number | null {
let state: LexerState = LexerState.inParens
let parenDepth = 0
for (let i = start; i < content.length; i++) {
const char = content.charAt(i)
switch (state) {
case LexerState.inParens:
if (char === `'`) {
state = LexerState.inSingleQuoteString
} else if (char === `"`) {
state = LexerState.inDoubleQuoteString
} else if (char === `(`) {
parenDepth++
} else if (char === `)`) {
if (parenDepth > 0) {
parenDepth--
} else {
return i
}
}
break
case LexerState.inSingleQuoteString:
if (char === `'`) {
state = LexerState.inParens
}
break
case LexerState.inDoubleQuoteString:
if (char === `"`) {
state = LexerState.inParens
}
break
}
}
return null
}
// for compileStyle
export interface CssVarsPluginOptions {
id: string
isProd: boolean
}
export const cssVarsPlugin: PluginCreator<CssVarsPluginOptions> = opts => {
const { id, isProd } = opts!
return {
postcssPlugin: 'vue-sfc-vars',
Declaration(decl) {
// rewrite CSS variables
const value = decl.value
if (vBindRE.test(value)) {
vBindRE.lastIndex = 0
let transformed = ''
let lastIndex = 0
let match
while ((match = vBindRE.exec(value))) {
const start = match.index + match[0].length
const end = lexBinding(value, start)
Eif (end !== null) {
const variable = normalizeExpression(value.slice(start, end))
transformed +=
value.slice(lastIndex, match.index) +
`var(--${genVarName(id, variable, isProd)})`
lastIndex = end + 1
}
}
decl.value = transformed + value.slice(lastIndex)
}
},
}
}
cssVarsPlugin.postcss = true
export function genCssVarsCode(
vars: string[],
bindings: BindingMetadata,
id: string,
isProd: boolean,
) {
const varsExp = genCssVarsFromList(vars, id, isProd)
const exp = createSimpleExpression(varsExp, false)
const context = createTransformContext(createRoot([]), {
prefixIdentifiers: true,
inline: true,
bindingMetadata: bindings.__isScriptSetup === false ? undefined : bindings,
})
const transformed = processExpression(exp, context)
const transformedString =
transformed.type === NodeTypes.SIMPLE_EXPRESSION
? transformed.content
: transformed.children
.map(c => {
return typeof c === 'string'
? c
: (c as SimpleExpressionNode).content
})
.join('')
return `_${CSS_VARS_HELPER}(_ctx => (${transformedString}))`
}
// <script setup> already gets the calls injected as part of the transform
// this is only for single normal <script>
export function genNormalScriptCssVarsCode(
cssVars: string[],
bindings: BindingMetadata,
id: string,
isProd: boolean,
defaultVar: string,
): string {
return (
`\nimport { ${CSS_VARS_HELPER} as _${CSS_VARS_HELPER} } from 'vue'\n` +
`const __injectCSSVars__ = () => {\n${genCssVarsCode(
cssVars,
bindings,
id,
isProd,
)}}\n` +
`const __setup__ = ${defaultVar}.setup\n` +
`${defaultVar}.setup = __setup__\n` +
` ? (props, ctx) => { __injectCSSVars__();return __setup__(props, ctx) }\n` +
` : __injectCSSVars__\n`
)
}
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