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type NodeTransform,
type TransformContext,
createStructuralDirectiveTransform,
traverseNode,
} from '../transform'
import {
type AttributeNode,
type BlockCodegenNode,
type CacheExpression,
ConstantTypes,
type DirectiveNode,
type ElementNode,
ElementTypes,
type IfBranchNode,
type IfConditionalExpression,
type IfNode,
type MemoExpression,
NodeTypes,
type SimpleExpressionNode,
convertToBlock,
createCallExpression,
createConditionalExpression,
createObjectExpression,
createObjectProperty,
createSimpleExpression,
createVNodeCall,
locStub,
} from '../ast'
import { ErrorCodes, createCompilerError } from '../errors'
import { processExpression } from './transformExpression'
import { validateBrowserExpression } from '../validateExpression'
import { cloneLoc } from '../parser'
import { CREATE_COMMENT, FRAGMENT } from '../runtimeHelpers'
import { findDir, findProp, getMemoedVNodeCall, injectProp } from '../utils'
import { PatchFlags } from '@vue/shared'
export const transformIf: NodeTransform = 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,
): (() => 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)
}
if (__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: cloneLoc(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 or there are two adjacent v-else
if (
(dir.name === 'else-if' || dir.name === 'else') &&
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 &&
(context.parent.tag === 'transition' ||
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_CACHE,
),
)
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
// 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
}
return createVNodeCall(
context,
helper(FRAGMENT),
createObjectExpression([keyProperty]),
children,
patchFlag,
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) {
convertToBlock(vnodeCall, context)
}
// inject branch key
injectProp(vnodeCall, keyProperty, context)
return ret
}
}
function isSameKey(
a: AttributeNode | DirectiveNode | undefined,
b: AttributeNode | DirectiveNode,
): boolean {
if (!a || a.type !== b.type) {
return false
}
if (a.type === NodeTypes.ATTRIBUTE) {
if (a.value!.content !== (b as AttributeNode).value!.content) {
return false
}
} else {
// directive
const exp = a.exp!
const branchExp = (b as DirectiveNode).exp!
if (exp.type !== branchExp.type) {
return false
}
if (
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
}
}
}
|