feat: Support default values for v-bind in CSS

Author: leemotive

packages/compiler-sfc/__tests__/cssVars.spec.ts

@@ -105,18 +105,24 @@ describe('CSS vars injection', () => {
         `<style>div{
           color: v-bind(color);
           font-size: v-bind('font.size');
+          width: v-bind(width, 100%);
+          font-weight: v-bind('font.weight', bold);
         }</style>`,
       { isProd: true },
     )
     expect(content).toMatch(`_useCssVars(_ctx => ({
   "4003f1a6": (_ctx.color),
-  "41b6490a": (_ctx.font.size)
+  "41b6490a": (_ctx.font.size),
+  "3dd5f4e0": (_ctx.width),
+  "9848e57e": (_ctx.font.weight)
 }))}`)
 
     const { code } = compileStyle({
       source: `.foo {
         color: v-bind(color);
         font-size: v-bind('font.size');
+        width: v-bind(width, 100%);
+        font-weight: v-bind('font.weight', bold);
       }`,
       filename: 'test.css',
       id: mockId,
@@ -126,6 +132,8 @@ describe('CSS vars injection', () => {
       ".foo {
               color: var(--4003f1a6);
               font-size: var(--41b6490a);
+              width: var(--3dd5f4e0, 100%);
+              font-weight: var(--9848e57e, bold);
       }"
     `)
   })

packages/compiler-sfc/src/style/cssVars.ts

@@ -98,9 +98,9 @@ function lexBinding(content: string, start: number): number | null {
           state = LexerState.inDoubleQuoteString
         } else if (char === `(`) {
           parenDepth++
-        } else if (char === `)`) {
+        } else if (char === `)` || char === ',') {
           if (parenDepth > 0) {
-            parenDepth--
+            char === `)` && parenDepth--
           } else {
             return i
           }
@@ -146,8 +146,8 @@ export const cssVarsPlugin: PluginCreator<CssVarsPluginOptions> = opts => {
             const variable = normalizeExpression(value.slice(start, end))
             transformed +=
               value.slice(lastIndex, match.index) +
-              `var(--${genVarName(id, variable, isProd)})`
-            lastIndex = end + 1
+              `var(--${genVarName(id, variable, isProd)}`
+            lastIndex = end
           }
         }
         decl.value = transformed + value.slice(lastIndex)