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createStructuralDirectiveTransform,
TransformContext,
traverseNode
} from '../transform'
import {
NodeTypes,
ElementTypes,
ElementNode,
DirectiveNode,
IfBranchNode,
SimpleExpressionNode,
createCallExpression,
createConditionalExpression,
createSimpleExpression,
createObjectProperty,
createObjectExpression,
IfConditionalExpression,
BlockCodegenNode,
IfNode,
createVNodeCall,
AttributeNode,
locStub,
CacheExpression,
ConstantTypes,
MemoExpression
} from '../ast'
import { createCompilerError, ErrorCodes } from '../errors'
import { processExpression } from './transformExpression'
import { validateBrowserExpression } from '../validateExpression'
import { FRAGMENT, CREATE_COMMENT } from '../runtimeHelpers'
import {
injectProp,
findDir,
findProp,
isBuiltInType,
makeBlock
} from '../utils'
import { PatchFlags, PatchFlagNames } from '@vue/shared'
import { getMemoedVNodeCall } from '..'
export const transformIf = createStructuralDirectiveTransform(
/^(if|else|else-if)$/,
(node, dir, context) => {
return processIf(node, dir, context, (ifNode, branch, isRoot) => {
// #1587: We need to dynamically increment the key based on the current
// node's sibling nodes, since chained v-if/else branches are
// rendered at the same depth
const siblings = context.parent!.children
let i = siblings.indexOf(ifNode)
let key = 0
while (i-- >= 0) {
const sibling = siblings[i]
if (sibling && sibling.type === NodeTypes.IF) {
key += sibling.branches.length
}
}
// Exit callback. Complete the codegenNode when all children have been
// transformed.
return () => {
if (isRoot) {
ifNode.codegenNode = createCodegenNodeForBranch(
branch,
key,
context
) as IfConditionalExpression
} else {
// attach this branch's codegen node to the v-if root.
const parentCondition = getParentCondition(ifNode.codegenNode!)
parentCondition.alternate = createCodegenNodeForBranch(
branch,
key + ifNode.branches.length - 1,
context
)
}
}
})
}
)
// target-agnostic transform used for both Client and SSR
export function processIf(
node: ElementNode,
dir: DirectiveNode,
context: TransformContext,
processCodegen?: (
node: IfNode,
branch: IfBranchNode,
isRoot: boolean
) => (() => void) | undefined
) {
if (
dir.name !== 'else' &&
(!dir.exp || !(dir.exp as SimpleExpressionNode).content.trim())
) {
const loc = dir.exp ? dir.exp.loc : node.loc
context.onError(
createCompilerError(ErrorCodes.X_V_IF_NO_EXPRESSION, dir.loc)
)
dir.exp = createSimpleExpression(`true`, false, loc)
}
if (!__BROWSER__ && context.prefixIdentifiers && dir.exp) {
// dir.exp can only be simple expression because vIf transform is applied
// before expression transform.
dir.exp = processExpression(dir.exp as SimpleExpressionNode, context)
}
Iif (__DEV__ && __BROWSER__ && dir.exp) {
validateBrowserExpression(dir.exp as SimpleExpressionNode, context)
}
if (dir.name === 'if') {
const branch = createIfBranch(node, dir)
const ifNode: IfNode = {
type: NodeTypes.IF,
loc: node.loc,
branches: [branch]
}
context.replaceNode(ifNode)
if (processCodegen) {
return processCodegen(ifNode, branch, true)
}
} else {
// locate the adjacent v-if
const siblings = context.parent!.children
const comments = []
let i = siblings.indexOf(node)
while (i-- >= -1) {
const sibling = siblings[i]
if (sibling && sibling.type === NodeTypes.COMMENT) {
context.removeNode(sibling)
__DEV__ && comments.unshift(sibling)
continue
}
if (
sibling &&
sibling.type === NodeTypes.TEXT &&
!sibling.content.trim().length
) {
context.removeNode(sibling)
continue
}
if (sibling && sibling.type === NodeTypes.IF) {
// Check if v-else was followed by v-else-if
if (
dir.name === 'else-if' &&
sibling.branches[sibling.branches.length - 1].condition === undefined
) {
context.onError(
createCompilerError(ErrorCodes.X_V_ELSE_NO_ADJACENT_IF, node.loc)
)
}
// move the node to the if node's branches
context.removeNode()
const branch = createIfBranch(node, dir)
if (
__DEV__ &&
comments.length &&
// #3619 ignore comments if the v-if is direct child of <transition>
!(
context.parent &&
context.parent.type === NodeTypes.ELEMENT &&
isBuiltInType(context.parent.tag, 'transition')
)
) {
branch.children = [...comments, ...branch.children]
}
// check if user is forcing same key on different branches
if (__DEV__ || !__BROWSER__) {
const key = branch.userKey
if (key) {
sibling.branches.forEach(({ userKey }) => {
if (isSameKey(userKey, key)) {
context.onError(
createCompilerError(
ErrorCodes.X_V_IF_SAME_KEY,
branch.userKey!.loc
)
)
}
})
}
}
sibling.branches.push(branch)
const onExit = processCodegen && processCodegen(sibling, branch, false)
// since the branch was removed, it will not be traversed.
// make sure to traverse here.
traverseNode(branch, context)
// call on exit
if (onExit) onExit()
// make sure to reset currentNode after traversal to indicate this
// node has been removed.
context.currentNode = null
} else {
context.onError(
createCompilerError(ErrorCodes.X_V_ELSE_NO_ADJACENT_IF, node.loc)
)
}
break
}
}
}
function createIfBranch(node: ElementNode, dir: DirectiveNode): IfBranchNode {
const isTemplateIf = node.tagType === ElementTypes.TEMPLATE
return {
type: NodeTypes.IF_BRANCH,
loc: node.loc,
condition: dir.name === 'else' ? undefined : dir.exp,
children: isTemplateIf && !findDir(node, 'for') ? node.children : [node],
userKey: findProp(node, `key`),
isTemplateIf
}
}
function createCodegenNodeForBranch(
branch: IfBranchNode,
keyIndex: number,
context: TransformContext
): IfConditionalExpression | BlockCodegenNode | MemoExpression {
if (branch.condition) {
return createConditionalExpression(
branch.condition,
createChildrenCodegenNode(branch, keyIndex, context),
// make sure to pass in asBlock: true so that the comment node call
// closes the current block.
createCallExpression(context.helper(CREATE_COMMENT), [
__DEV__ ? '"v-if"' : '""',
'true'
])
) as IfConditionalExpression
} else {
return createChildrenCodegenNode(branch, keyIndex, context)
}
}
function createChildrenCodegenNode(
branch: IfBranchNode,
keyIndex: number,
context: TransformContext
): BlockCodegenNode | MemoExpression {
const { helper } = context
const keyProperty = createObjectProperty(
`key`,
createSimpleExpression(
`${keyIndex}`,
false,
locStub,
ConstantTypes.CAN_HOIST
)
)
const { children } = branch
const firstChild = children[0]
const needFragmentWrapper =
children.length !== 1 || firstChild.type !== NodeTypes.ELEMENT
if (needFragmentWrapper) {
if (children.length === 1 && firstChild.type === NodeTypes.FOR) {
// optimize away nested fragments when child is a ForNode
const vnodeCall = firstChild.codegenNode!
injectProp(vnodeCall, keyProperty, context)
return vnodeCall
} else {
let patchFlag = PatchFlags.STABLE_FRAGMENT
let patchFlagText = PatchFlagNames[PatchFlags.STABLE_FRAGMENT]
// check if the fragment actually contains a single valid child with
// the rest being comments
if (
__DEV__ &&
!branch.isTemplateIf &&
children.filter(c => c.type !== NodeTypes.COMMENT).length === 1
) {
patchFlag |= PatchFlags.DEV_ROOT_FRAGMENT
patchFlagText += `, ${PatchFlagNames[PatchFlags.DEV_ROOT_FRAGMENT]}`
}
return createVNodeCall(
context,
helper(FRAGMENT),
createObjectExpression([keyProperty]),
children,
patchFlag + (__DEV__ ? ` /* ${patchFlagText} */` : ``),
undefined,
undefined,
true,
false,
false /* isComponent */,
branch.loc
)
}
} else {
const ret = (firstChild as ElementNode).codegenNode as
| BlockCodegenNode
| MemoExpression
const vnodeCall = getMemoedVNodeCall(ret)
// Change createVNode to createBlock.
if (vnodeCall.type === NodeTypes.VNODE_CALL) {
makeBlock(vnodeCall, context)
}
// inject branch key
injectProp(vnodeCall, keyProperty, context)
return ret
}
}
function isSameKey(
a: AttributeNode | DirectiveNode | undefined,
b: AttributeNode | DirectiveNode
): boolean {
Iif (!a || a.type !== b.type) {
return false
}
if (a.type === NodeTypes.ATTRIBUTE) {
Iif (a.value!.content !== (b as AttributeNode).value!.content) {
return false
}
} else {
// directive
const exp = a.exp!
const branchExp = (b as DirectiveNode).exp!
Iif (exp.type !== branchExp.type) {
return false
}
Iif (
exp.type !== NodeTypes.SIMPLE_EXPRESSION ||
exp.isStatic !== (branchExp as SimpleExpressionNode).isStatic ||
exp.content !== (branchExp as SimpleExpressionNode).content
) {
return false
}
}
return true
}
function getParentCondition(
node: IfConditionalExpression | CacheExpression
): IfConditionalExpression {
while (true) {
if (node.type === NodeTypes.JS_CONDITIONAL_EXPRESSION) {
if (node.alternate.type === NodeTypes.JS_CONDITIONAL_EXPRESSION) {
node = node.alternate
} else {
return node
}
} else if (node.type === NodeTypes.JS_CACHE_EXPRESSION) {
node = node.value as IfConditionalExpression
}
}
}
|