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import { type ArrayExpression, type AttributeNode, type CallExpression, type DirectiveNode, ElementTypes, ErrorCodes, type ExpressionNode, type InterpolationNode, type JSChildNode, MERGE_PROPS, type NodeTransform, NodeTypes, type PlainElementNode, type PropsExpression, type TemplateLiteral, type TextNode, type TransformContext, buildDirectiveArgs, buildProps, createArrayExpression, createAssignmentExpression, createCallExpression, createCompilerError, createCompoundExpression, createConditionalExpression, createInterpolation, createSequenceExpression, createSimpleExpression, createTemplateLiteral, hasDynamicKeyVBind, isStaticArgOf, isStaticExp, } from '@vue/compiler-dom' import { NO, escapeHtml, isBooleanAttr, isBuiltInDirective, isSSRSafeAttrName, propsToAttrMap, } from '@vue/shared' import { SSRErrorCodes, createSSRCompilerError } from '../errors' import { SSR_GET_DIRECTIVE_PROPS, SSR_GET_DYNAMIC_MODEL_PROPS, SSR_INCLUDE_BOOLEAN_ATTR, SSR_INTERPOLATE, SSR_RENDER_ATTR, SSR_RENDER_ATTRS, SSR_RENDER_CLASS, SSR_RENDER_DYNAMIC_ATTR, SSR_RENDER_STYLE, } from '../runtimeHelpers' import { type 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'] = [`<${node.tag}`] // some tags need to be passed to runtime for special checks const needTagForRuntime = node.tag === 'textarea' || node.tag.indexOf('-') > 0 // v-bind="obj", v-bind:[key] and custom directives can potentially // overwrite other static attrs and can affect final rendering result, // so when they are present we need to bail out to full `renderAttrs` const hasDynamicVBind = hasDynamicKeyVBind(node) const hasCustomDir = node.props.some( p => p.type === NodeTypes.DIRECTIVE && !isBuiltInDirective(p.name), ) const needMergeProps = hasDynamicVBind || hasCustomDir if (needMergeProps) { const { props, directives } = buildProps( node, context, node.props, false /* isComponent */, false /* isDynamicComponent */, true /* ssr */, ) if (props || directives.length) { const mergedProps = buildSSRProps(props, directives, context) const propsExp = createCallExpression( context.helper(SSR_RENDER_ATTRS), [mergedProps], ) if (node.tag === 'textarea') { const existingText = node.children[0] as | TextNode | InterpolationNode | undefined // If interpolation, this is dynamic <textarea> content, potentially // injected by v-model and takes higher priority than v-bind value if (!existingText || existingText.type !== NodeTypes.INTERPOLATION) { // <textarea> with dynamic v-bind. We don't know if the final props // will contain .value, so we will have to do something special: // assign the merged props to a temp variable, and check whether // it contains value (if yes, render is as children). const tempId = `_temp${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${context.temps++}` const tempExp = createSimpleExpression(tempId, false) propsExp.arguments = [ createSequenceExpression([ createAssignmentExpression(tempExp, mergedProps), createCallExpression(context.helper(MERGE_PROPS), [ tempExp, createCallExpression( context.helper(SSR_GET_DYNAMIC_MODEL_PROPS), [ tempExp, // existing props vModel.exp!, // model ], ), ]), ]), ] } } else if (directives.length && !node.children.length) { const tempId = `_temp${context.temps++}` propsExp.arguments = [ createAssignmentExpression( createSimpleExpression(tempId, false), mergedProps, ), ] rawChildrenMap.set( node, createConditionalExpression( createSimpleExpression(`"textContent" in ${tempId}`, false), createCallExpression(context.helper(SSR_INTERPOLATE), [ createSimpleExpression(`${tempId}.textContent`, false), ]), createSimpleExpression(`${tempId}.innerHTML ?? ''`, false), false, ), ) } if (needTagForRuntime) { propsExp.arguments.push(`"${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, createCompoundExpression([`(`, prop.exp, `) ?? ''`]), ) } else if (prop.name === 'text' && prop.exp) { node.children = [createInterpolation(prop.exp, prop.loc)] } else if (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 && prop.name !== 'on') { // 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 { context.onError( createSSRCompilerError( SSRErrorCodes.X_SSR_UNSAFE_ATTR_NAME, key.loc, ), ) } } } else { // dynamic key attr // this branch is only encountered for custom directive // transforms that returns properties with dynamic keys const args: CallExpression['arguments'] = [key, value] if (needTagForRuntime) { args.push(`"${node.tag}"`) } openTag.push( createCallExpression( context.helper(SSR_RENDER_DYNAMIC_ATTR), args, ), ) } } } } } else { // special case: value on <textarea> const name = prop.name if (node.tag === 'textarea' && name === 'value' && prop.value) { rawChildrenMap.set(node, escapeHtml(prop.value.content)) } else if (!needMergeProps) { if (name === 'key' || name === 'ref') { continue } // static prop if (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, ): void { 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, context) } if (!isVoidTag(node.tag)) { // push closing tag context.pushStringPart(`</${node.tag}>`) } } |