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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 | 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 217x 217x 7x 7x 7x 7x 1x 217x 217x 217x 217x 488x 488x 308x 308x 308x 56x 56x 1314x 266x 266x 266x 266x 1314x 1314x 1314x 522x 792x 124x 124x 91x 33x 480x 21x 480x 480x 533x 533x 387x 291x 291x 79x 79x 17x 17x 387x 69x 69x 5x 5x 32x 32x 24x 24x 16x 16x 480x 21x 33x 91x 91x 91x | import {
RootNode,
BlockStatement,
TemplateLiteral,
createCallExpression,
createTemplateLiteral,
NodeTypes,
TemplateChildNode,
ElementTypes,
createBlockStatement,
CompilerOptions,
IfStatement,
CallExpression,
isText,
processExpression,
createSimpleExpression,
createCompoundExpression,
createTransformContext,
createRoot
} from '@vue/compiler-dom'
import { isString, escapeHtml } from '@vue/shared'
import { SSR_INTERPOLATE, ssrHelpers } from './runtimeHelpers'
import { ssrProcessIf } from './transforms/ssrVIf'
import { ssrProcessFor } from './transforms/ssrVFor'
import { ssrProcessSlotOutlet } from './transforms/ssrTransformSlotOutlet'
import { ssrProcessComponent } from './transforms/ssrTransformComponent'
import { ssrProcessElement } from './transforms/ssrTransformElement'
import { createSSRCompilerError, SSRErrorCodes } from './errors'
// Because SSR codegen output is completely different from client-side output
// (e.g. multiple elements can be concatenated into a single template literal
// instead of each getting a corresponding call), we need to apply an extra
// transform pass to convert the template AST into a fresh JS AST before
// passing it to codegen.
export function ssrCodegenTransform(ast: RootNode, options: CompilerOptions) {
const context = createSSRTransformContext(ast, options)
// inject SFC <style> CSS variables
// we do this instead of inlining the expression to ensure the vars are
// only resolved once per render
if (options.ssrCssVars) {
const cssContext = createTransformContext(createRoot([]), options)
const varsExp = processExpression(
createSimpleExpression(options.ssrCssVars, false),
cssContext
)
context.body.push(
createCompoundExpression([`const _cssVars = { style: `, varsExp, `}`])
)
Array.from(cssContext.helpers.keys()).forEach(helper => {
if (!ast.helpers.includes(helper)) ast.helpers.push(helper)
})
}
const isFragment =
ast.children.length > 1 && ast.children.some(c => !isText(c))
processChildren(ast, context, isFragment)
ast.codegenNode = createBlockStatement(context.body)
// Finalize helpers.
// We need to separate helpers imported from 'vue' vs. '@vue/server-renderer'
ast.ssrHelpers = Array.from(
new Set([...ast.helpers.filter(h => h in ssrHelpers), ...context.helpers])
)
ast.helpers = ast.helpers.filter(h => !(h in ssrHelpers))
}
export type SSRTransformContext = ReturnType<typeof createSSRTransformContext>
function createSSRTransformContext(
root: RootNode,
options: CompilerOptions,
helpers: Set<symbol> = new Set(),
withSlotScopeId = false
) {
const body: BlockStatement['body'] = []
let currentString: TemplateLiteral | null = null
return {
root,
options,
body,
helpers,
withSlotScopeId,
onError:
options.onError ||
(e => {
throw e
}),
helper<T extends symbol>(name: T): T {
helpers.add(name)
return name
},
pushStringPart(part: TemplateLiteral['elements'][0]) {
if (!currentString) {
const currentCall = createCallExpression(`_push`)
body.push(currentCall)
currentString = createTemplateLiteral([])
currentCall.arguments.push(currentString)
}
const bufferedElements = currentString.elements
const lastItem = bufferedElements[bufferedElements.length - 1]
if (isString(part) && isString(lastItem)) {
bufferedElements[bufferedElements.length - 1] += part
} else {
bufferedElements.push(part)
}
},
pushStatement(statement: IfStatement | CallExpression) {
// close current string
currentString = null
body.push(statement)
}
}
}
function createChildContext(
parent: SSRTransformContext,
withSlotScopeId = parent.withSlotScopeId
): SSRTransformContext {
// ensure child inherits parent helpers
return createSSRTransformContext(
parent.root,
parent.options,
parent.helpers,
withSlotScopeId
)
}
interface Container {
children: TemplateChildNode[]
}
export function processChildren(
parent: Container,
context: SSRTransformContext,
asFragment = false,
disableNestedFragments = false
) {
if (asFragment) {
context.pushStringPart(`<!--[-->`)
}
const { children } = parent
for (let i = 0; i < children.length; i++) {
const child = children[i]
switch (child.type) {
case NodeTypes.ELEMENT:
switch (child.tagType) {
case ElementTypes.ELEMENT:
ssrProcessElement(child, context)
break
case ElementTypes.COMPONENT:
ssrProcessComponent(child, context, parent)
break
case ElementTypes.SLOT:
ssrProcessSlotOutlet(child, context)
break
case ElementTypes.TEMPLATE:
// TODO
break
default:
context.onError(
createSSRCompilerError(
SSRErrorCodes.X_SSR_INVALID_AST_NODE,
(child as any).loc
)
)
// make sure we exhaust all possible types
const exhaustiveCheck: never = child
return exhaustiveCheck
}
break
case NodeTypes.TEXT:
context.pushStringPart(escapeHtml(child.content))
break
case NodeTypes.COMMENT:
// no need to escape comment here because the AST can only
// contain valid comments.
context.pushStringPart(`<!--${child.content}-->`)
break
case NodeTypes.INTERPOLATION:
context.pushStringPart(
createCallExpression(context.helper(SSR_INTERPOLATE), [child.content])
)
break
case NodeTypes.IF:
ssrProcessIf(child, context, disableNestedFragments)
break
case NodeTypes.FOR:
ssrProcessFor(child, context, disableNestedFragments)
break
case NodeTypes.IF_BRANCH:
// no-op - handled by ssrProcessIf
break
case NodeTypes.TEXT_CALL:
case NodeTypes.COMPOUND_EXPRESSION:
// no-op - these two types can never appear as template child node since
// `transformText` is not used during SSR compile.
break
default:
context.onError(
createSSRCompilerError(
SSRErrorCodes.X_SSR_INVALID_AST_NODE,
(child as any).loc
)
)
// make sure we exhaust all possible types
const exhaustiveCheck: never = child
return exhaustiveCheck
}
}
if (asFragment) {
context.pushStringPart(`<!--]-->`)
}
}
export function processChildrenAsStatement(
parent: Container,
parentContext: SSRTransformContext,
asFragment = false,
withSlotScopeId = parentContext.withSlotScopeId
): BlockStatement {
const childContext = createChildContext(parentContext, withSlotScopeId)
processChildren(parent, childContext, asFragment)
return createBlockStatement(childContext.body)
}
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