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fix(compiler-core): should pre-convert text nodes in all non-element cases

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This commit is contained in:
Evan You 2019-12-02 15:17:00 -05:00
parent 57bbbb227c
commit 42f3f9e832
1 changed files with 39 additions and 28 deletions
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67
packages/compiler-core/src/transforms/transformText.ts
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@ -6,7 +6,8 @@ import {
InterpolationNode,
CompoundExpressionNode,
createCallExpression,
CallExpression
CallExpression,
ElementTypes
} from '../ast'
import { CREATE_TEXT } from '../runtimeHelpers'
import { PatchFlags, PatchFlagNames } from '@vue/shared'
@ -53,33 +54,43 @@ export const transformText: NodeTransform = (node, context) => {
}
}
if (hasText && children.length > 1) {
// when an element has mixed text/element children, convert text nodes
// into createTextVNode(text) calls.
for (let i = 0; i < children.length; i++) {
const child = children[i]
if (isText(child) || child.type === NodeTypes.COMPOUND_EXPRESSION) {
const callArgs: CallExpression['arguments'] = []
// createTextVNode defaults to single whitespace, so if it is a
// single space the code could be an empty call to save bytes.
if (child.type !== NodeTypes.TEXT || child.content !== ' ') {
callArgs.push(child)
}
// mark dynamic text with flag so it gets patched inside a block
if (child.type !== NodeTypes.TEXT) {
callArgs.push(
`${PatchFlags.TEXT} /* ${PatchFlagNames[PatchFlags.TEXT]} */`
)
}
children[i] = {
type: NodeTypes.TEXT_CALL,
content: child,
loc: child.loc,
codegenNode: createCallExpression(
context.helper(CREATE_TEXT),
callArgs
)
}
if (
!hasText ||
// if this is a plain element with a single text child, leave it as-is
// since the runtime has dedicated fast path for this by directly
// setting textContent of the element.
(node.type === NodeTypes.ELEMENT &&
node.tagType === ElementTypes.ELEMENT &&
children.length === 1)
) {
return
}
// pre-convert text nodes into createTextVNode(text) calls to avoid
// runtime normalization.
for (let i = 0; i < children.length; i++) {
const child = children[i]
if (isText(child) || child.type === NodeTypes.COMPOUND_EXPRESSION) {
const callArgs: CallExpression['arguments'] = []
// createTextVNode defaults to single whitespace, so if it is a
// single space the code could be an empty call to save bytes.
if (child.type !== NodeTypes.TEXT || child.content !== ' ') {
callArgs.push(child)
}
// mark dynamic text with flag so it gets patched inside a block
if (child.type !== NodeTypes.TEXT) {
callArgs.push(
`${PatchFlags.TEXT} /* ${PatchFlagNames[PatchFlags.TEXT]} */`
)
}
children[i] = {
type: NodeTypes.TEXT_CALL,
content: child,
loc: child.loc,
codegenNode: createCallExpression(
context.helper(CREATE_TEXT),
callArgs
)
}
}
}