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NodeTransform,
NodeTypes,
ElementTypes,
TemplateLiteral,
createTemplateLiteral,
createInterpolation,
createCallExpression,
createConditionalExpression,
createSimpleExpression,
buildProps,
DirectiveNode,
PlainElementNode,
createCompilerError,
ErrorCodes,
CallExpression,
createArrayExpression,
ExpressionNode,
JSChildNode,
ArrayExpression,
createAssignmentExpression,
TextNode,
hasDynamicKeyVBind,
MERGE_PROPS,
isStaticArgOf,
createSequenceExpression,
InterpolationNode,
isStaticExp,
AttributeNode,
buildDirectiveArgs,
TransformContext,
PropsExpression
} from '@vue/compiler-dom'
import {
escapeHtml,
isBooleanAttr,
isBuiltInDirective,
isSSRSafeAttrName,
NO,
propsToAttrMap
} from '@vue/shared'
import { createSSRCompilerError, SSRErrorCodes } from '../errors'
import {
SSR_RENDER_ATTR,
SSR_RENDER_CLASS,
SSR_RENDER_STYLE,
SSR_RENDER_DYNAMIC_ATTR,
SSR_RENDER_ATTRS,
SSR_INTERPOLATE,
SSR_GET_DYNAMIC_MODEL_PROPS,
SSR_INCLUDE_BOOLEAN_ATTR,
SSR_GET_DIRECTIVE_PROPS
} from '../runtimeHelpers'
import { SSRTransformContext, processChildren } from '../ssrCodegenTransform'
// for directives with children overwrite (e.g. v-html & v-text), we need to
// store the raw children so that they can be added in the 2nd pass.
const rawChildrenMap = new WeakMap<
PlainElementNode,
TemplateLiteral['elements'][0]
>()
export const ssrTransformElement: NodeTransform = (node, context) => {
if (
node.type !== NodeTypes.ELEMENT ||
node.tagType !== ElementTypes.ELEMENT
) {
return
}
return function ssrPostTransformElement() {
// element
// generate the template literal representing the open tag.
const openTag: TemplateLiteral['elements'] = [`<${node.tag}`]
// some tags need to be passed to runtime for special checks
const needTagForRuntime =
node.tag === 'textarea' || node.tag.indexOf('-') > 0
// v-bind="obj", v-bind:[key] and custom directives can potentially
// overwrite other static attrs and can affect final rendering result,
// so when they are present we need to bail out to full `renderAttrs`
const hasDynamicVBind = hasDynamicKeyVBind(node)
const hasCustomDir = node.props.some(
p => p.type === NodeTypes.DIRECTIVE && !isBuiltInDirective(p.name)
)
const needMergeProps = hasDynamicVBind || hasCustomDir
if (needMergeProps) {
const { props, directives } = buildProps(
node,
context,
node.props,
true /* ssr */
)
if (props || directives.length) {
const mergedProps = buildSSRProps(props, directives, context)
const propsExp = createCallExpression(
context.helper(SSR_RENDER_ATTRS),
[mergedProps]
)
if (node.tag === 'textarea') {
const existingText = node.children[0] as
| TextNode
| InterpolationNode
| undefined
// If interpolation, this is dynamic <textarea> content, potentially
// injected by v-model and takes higher priority than v-bind value
if (!existingText || existingText.type !== NodeTypes.INTERPOLATION) {
// <textarea> with dynamic v-bind. We don't know if the final props
// will contain .value, so we will have to do something special:
// assign the merged props to a temp variable, and check whether
// it contains value (if yes, render is as children).
const tempId = `_temp${context.temps++}`
propsExp.arguments = [
createAssignmentExpression(
createSimpleExpression(tempId, false),
mergedProps
)
]
rawChildrenMap.set(
node,
createCallExpression(context.helper(SSR_INTERPOLATE), [
createConditionalExpression(
createSimpleExpression(`"value" in ${tempId}`, false),
createSimpleExpression(`${tempId}.value`, false),
createSimpleExpression(
existingText ? existingText.content : ``,
true
),
false
)
])
)
}
} else if (node.tag === 'input') {
// <input v-bind="obj" v-model>
// we need to determine the props to render for the dynamic v-model
// and merge it with the v-bind expression.
const vModel = findVModel(node)
if (vModel) {
// 1. save the props (san v-model) in a temp variable
const tempId = `_temp${context.temps++}`
const tempExp = createSimpleExpression(tempId, false)
propsExp.arguments = [
createSequenceExpression([
createAssignmentExpression(tempExp, mergedProps),
createCallExpression(context.helper(MERGE_PROPS), [
tempExp,
createCallExpression(
context.helper(SSR_GET_DYNAMIC_MODEL_PROPS),
[
tempExp, // existing props
vModel.exp! // model
]
)
])
])
]
}
}
if (needTagForRuntime) {
propsExp.arguments.push(`"${node.tag}"`)
}
openTag.push(propsExp)
}
}
// book keeping static/dynamic class merging.
let dynamicClassBinding: CallExpression | undefined = undefined
let staticClassBinding: string | undefined = undefined
// all style bindings are converted to dynamic by transformStyle.
// but we need to make sure to merge them.
let dynamicStyleBinding: CallExpression | undefined = undefined
for (let i = 0; i < node.props.length; i++) {
const prop = node.props[i]
// ignore true-value/false-value on input
if (node.tag === 'input' && isTrueFalseValue(prop)) {
continue
}
// special cases with children override
if (prop.type === NodeTypes.DIRECTIVE) {
if (prop.name === 'html' && prop.exp) {
rawChildrenMap.set(node, prop.exp)
} else if (prop.name === 'text' && prop.exp) {
node.children = [createInterpolation(prop.exp, prop.loc)]
} else Iif (prop.name === 'slot') {
context.onError(
createCompilerError(ErrorCodes.X_V_SLOT_MISPLACED, prop.loc)
)
} else if (isTextareaWithValue(node, prop) && prop.exp) {
if (!needMergeProps) {
node.children = [createInterpolation(prop.exp, prop.loc)]
}
} else if (!needMergeProps) {
// Directive transforms.
const directiveTransform = context.directiveTransforms[prop.name]
if (directiveTransform) {
const { props, ssrTagParts } = directiveTransform(
prop,
node,
context
)
if (ssrTagParts) {
openTag.push(...ssrTagParts)
}
for (let j = 0; j < props.length; j++) {
const { key, value } = props[j]
if (isStaticExp(key)) {
let attrName = key.content
// static key attr
if (attrName === 'key' || attrName === 'ref') {
continue
}
if (attrName === 'class') {
openTag.push(
` class="`,
(dynamicClassBinding = createCallExpression(
context.helper(SSR_RENDER_CLASS),
[value]
)),
`"`
)
} else if (attrName === 'style') {
if (dynamicStyleBinding) {
// already has style binding, merge into it.
mergeCall(dynamicStyleBinding, value)
} else {
openTag.push(
` style="`,
(dynamicStyleBinding = createCallExpression(
context.helper(SSR_RENDER_STYLE),
[value]
)),
`"`
)
}
} else {
attrName =
node.tag.indexOf('-') > 0
? attrName // preserve raw name on custom elements
: propsToAttrMap[attrName] || attrName.toLowerCase()
if (isBooleanAttr(attrName)) {
openTag.push(
createConditionalExpression(
createCallExpression(
context.helper(SSR_INCLUDE_BOOLEAN_ATTR),
[value]
),
createSimpleExpression(' ' + attrName, true),
createSimpleExpression('', true),
false /* no newline */
)
)
} else if (isSSRSafeAttrName(attrName)) {
openTag.push(
createCallExpression(context.helper(SSR_RENDER_ATTR), [
key,
value
])
)
} else E{
context.onError(
createSSRCompilerError(
SSRErrorCodes.X_SSR_UNSAFE_ATTR_NAME,
key.loc
)
)
}
}
} else E{
// dynamic key attr
// this branch is only encountered for custom directive
// transforms that returns properties with dynamic keys
const args: CallExpression['arguments'] = [key, value]
Iif (needTagForRuntime) {
args.push(`"${node.tag}"`)
}
openTag.push(
createCallExpression(
context.helper(SSR_RENDER_DYNAMIC_ATTR),
args
)
)
}
}
}
}
} else {
// special case: value on <textarea>
if (node.tag === 'textarea' && prop.name === 'value' && prop.value) {
rawChildrenMap.set(node, escapeHtml(prop.value.content))
} else if (!needMergeProps) {
if (prop.name === 'key' || prop.name === 'ref') {
continue
}
// static prop
if (prop.name === 'class' && prop.value) {
staticClassBinding = JSON.stringify(prop.value.content)
}
openTag.push(
` ${prop.name}` +
(prop.value ? `="${escapeHtml(prop.value.content)}"` : ``)
)
}
}
}
// handle co-existence of dynamic + static class bindings
if (dynamicClassBinding && staticClassBinding) {
mergeCall(dynamicClassBinding, staticClassBinding)
removeStaticBinding(openTag, 'class')
}
if (context.scopeId) {
openTag.push(` ${context.scopeId}`)
}
node.ssrCodegenNode = createTemplateLiteral(openTag)
}
}
export function buildSSRProps(
props: PropsExpression | undefined,
directives: DirectiveNode[],
context: TransformContext
): JSChildNode {
let mergePropsArgs: JSChildNode[] = []
if (props) {
if (props.type === NodeTypes.JS_CALL_EXPRESSION) {
// already a mergeProps call
mergePropsArgs = props.arguments as JSChildNode[]
} else {
mergePropsArgs.push(props)
}
}
if (directives.length) {
for (const dir of directives) {
mergePropsArgs.push(
createCallExpression(context.helper(SSR_GET_DIRECTIVE_PROPS), [
`_ctx`,
...buildDirectiveArgs(dir, context).elements
] as JSChildNode[])
)
}
}
return mergePropsArgs.length > 1
? createCallExpression(context.helper(MERGE_PROPS), mergePropsArgs)
: mergePropsArgs[0]
}
function isTrueFalseValue(prop: DirectiveNode | AttributeNode) {
if (prop.type === NodeTypes.DIRECTIVE) {
return (
prop.name === 'bind' &&
prop.arg &&
isStaticExp(prop.arg) &&
(prop.arg.content === 'true-value' || prop.arg.content === 'false-value')
)
} else {
return prop.name === 'true-value' || prop.name === 'false-value'
}
}
function isTextareaWithValue(
node: PlainElementNode,
prop: DirectiveNode
): boolean {
return !!(
node.tag === 'textarea' &&
prop.name === 'bind' &&
isStaticArgOf(prop.arg, 'value')
)
}
function mergeCall(call: CallExpression, arg: string | JSChildNode) {
const existing = call.arguments[0] as ExpressionNode | ArrayExpression
if (existing.type === NodeTypes.JS_ARRAY_EXPRESSION) {
existing.elements.push(arg)
} else {
call.arguments[0] = createArrayExpression([existing, arg])
}
}
function removeStaticBinding(
tag: TemplateLiteral['elements'],
binding: string
) {
const regExp = new RegExp(`^ ${binding}=".+"$`)
const i = tag.findIndex(e => typeof e === 'string' && regExp.test(e))
if (i > -1) {
tag.splice(i, 1)
}
}
function findVModel(node: PlainElementNode): DirectiveNode | undefined {
return node.props.find(
p => p.type === NodeTypes.DIRECTIVE && p.name === 'model' && p.exp
) as DirectiveNode | undefined
}
export function ssrProcessElement(
node: PlainElementNode,
context: SSRTransformContext
) {
const isVoidTag = context.options.isVoidTag || NO
const elementsToAdd = node.ssrCodegenNode!.elements
for (let j = 0; j < elementsToAdd.length; j++) {
context.pushStringPart(elementsToAdd[j])
}
// Handle slot scopeId
if (context.withSlotScopeId) {
context.pushStringPart(createSimpleExpression(`_scopeId`, false))
}
// close open tag
context.pushStringPart(`>`)
const rawChildren = rawChildrenMap.get(node)
if (rawChildren) {
context.pushStringPart(rawChildren)
} else if (node.children.length) {
processChildren(node.children, context)
}
if (!isVoidTag(node.tag)) {
// push closing tag
context.pushStringPart(`</${node.tag}>`)
}
}
|