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feat(compiler-core): re-implement v-once to use cache mechanism

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This commit is contained in:
Evan You
2019-10-23 17:57:40 -04:00
parent 9291011456
commit af5a8e1154
21 changed files with 388 additions and 95 deletions
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19
packages/compiler-core/src/transform.ts
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@@ -100,7 +100,7 @@ export interface TransformContext extends Required<TransformOptions> {
addIdentifiers(exp: ExpressionNode | string): void
removeIdentifiers(exp: ExpressionNode | string): void
hoist(exp: JSChildNode): SimpleExpressionNode
cache<T extends JSChildNode>(exp: T): CacheExpression | T
cache<T extends JSChildNode>(exp: T, isVNode?: boolean): CacheExpression | T
}
function createTransformContext(
@@ -219,8 +219,8 @@ function createTransformContext(
true
)
},
cache(exp) {
return cacheHandlers ? createCacheExpression(++context.cached, exp) : exp
cache(exp, isVNode = false) {
return createCacheExpression(++context.cached, exp, isVNode)
}
}
@@ -260,12 +260,17 @@ function finalizeRoot(root: RootNode, context: TransformContext) {
const codegenNode = child.codegenNode as
| ElementCodegenNode
| ComponentCodegenNode
if (codegenNode.callee === WITH_DIRECTIVES) {
codegenNode.arguments[0].callee = helper(CREATE_BLOCK)
| CacheExpression
if (codegenNode.type !== NodeTypes.JS_CACHE_EXPRESSION) {
if (codegenNode.callee === WITH_DIRECTIVES) {
codegenNode.arguments[0].callee = helper(CREATE_BLOCK)
} else {
codegenNode.callee = helper(CREATE_BLOCK)
}
root.codegenNode = createBlockExpression(codegenNode, context)
} else {
codegenNode.callee = helper(CREATE_BLOCK)
root.codegenNode = codegenNode
}
root.codegenNode = createBlockExpression(codegenNode, context)
} else {
// - single <slot/>, IfNode, ForNode: already blocks.
// - single text node: always patched.