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processExpression,
createTransformContext,
createSimpleExpression,
createRoot,
NodeTypes,
SimpleExpressionNode,
BindingMetadata
} from '@vue/compiler-dom'
import { SFCDescriptor } from './parse'
import { PluginCreator } from 'postcss'
import hash from 'hash-sum'
export const CSS_VARS_HELPER = `useCssVars`
export function genCssVarsFromList(
vars: string[],
id: string,
isProd: boolean,
isSSR = false
): string {
return `{\n ${vars
.map(
key => `"${isSSR ? `--` : ``}${genVarName(id, key, isProd)}": (${key})`
)
.join(',\n ')}\n}`
}
function genVarName(id: string, raw: string, isProd: boolean): string {
if (isProd) {
return hash(id + raw)
} else {
return `${id}-${raw.replace(/([^\w-])/g, '_')}`
}
}
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 /* ... */
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)
if (end !== null) {
const variable = normalizeExpression(content.slice(start, end))
if (!vars.includes(variable)) {
vars.push(variable)
}
}
}
})
return vars
}
const 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)
if (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
): string {
return (
`\nimport { ${CSS_VARS_HELPER} as _${CSS_VARS_HELPER} } from 'vue'\n` +
`const __injectCSSVars__ = () => {\n${genCssVarsCode(
cssVars,
bindings,
id,
isProd
)}}\n` +
`const __setup__ = __default__.setup\n` +
`__default__.setup = __setup__\n` +
` ? (props, ctx) => { __injectCSSVars__();return __setup__(props, ctx) }\n` +
` : __injectCSSVars__\n`
)
}
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