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NodeTypes,
ElementNode,
SourceLocation,
CompilerError,
TextModes,
BindingMetadata
} from '@vue/compiler-core'
import * as CompilerDOM from '@vue/compiler-dom'
import { RawSourceMap, SourceMapGenerator } from 'source-map'
import { TemplateCompiler } from './compileTemplate'
import { parseCssVars } from './cssVars'
import { createCache } from './cache'
import { hmrShouldReload, ImportBinding } from './compileScript'
export interface SFCParseOptions {
filename?: string
sourceMap?: boolean
sourceRoot?: string
pad?: boolean | 'line' | 'space'
ignoreEmpty?: boolean
compiler?: TemplateCompiler
}
export interface SFCBlock {
type: string
content: string
attrs: Record<string, string | true>
loc: SourceLocation
map?: RawSourceMap
lang?: string
src?: string
}
export interface SFCTemplateBlock extends SFCBlock {
type: 'template'
ast: ElementNode
}
export interface SFCScriptBlock extends SFCBlock {
type: 'script'
setup?: string | boolean
bindings?: BindingMetadata
imports?: Record<string, ImportBinding>
/**
* import('\@babel/types').Statement
*/
scriptAst?: any[]
/**
* import('\@babel/types').Statement
*/
scriptSetupAst?: any[]
}
export interface SFCStyleBlock extends SFCBlock {
type: 'style'
scoped?: boolean
module?: string | boolean
}
export interface SFCDescriptor {
filename: string
source: string
template: SFCTemplateBlock | null
script: SFCScriptBlock | null
scriptSetup: SFCScriptBlock | null
styles: SFCStyleBlock[]
customBlocks: SFCBlock[]
cssVars: string[]
/**
* whether the SFC uses :slotted() modifier.
* this is used as a compiler optimization hint.
*/
slotted: boolean
/**
* compare with an existing descriptor to determine whether HMR should perform
* a reload vs. re-render.
*
* Note: this comparison assumes the prev/next script are already identical,
* and only checks the special case where <script setup lang="ts"> unused import
* pruning result changes due to template changes.
*/
shouldForceReload: (prevImports: Record<string, ImportBinding>) => boolean
}
export interface SFCParseResult {
descriptor: SFCDescriptor
errors: (CompilerError | SyntaxError)[]
}
const sourceToSFC = createCache<SFCParseResult>()
export function parse(
source: string,
{
sourceMap = true,
filename = 'anonymous.vue',
sourceRoot = '',
pad = false,
ignoreEmpty = true,
compiler = CompilerDOM
}: SFCParseOptions = {}
): SFCParseResult {
const sourceKey =
source + sourceMap + filename + sourceRoot + pad + compiler.parse
const cache = sourceToSFC.get(sourceKey)
if (cache) {
return cache
}
const descriptor: SFCDescriptor = {
filename,
source,
template: null,
script: null,
scriptSetup: null,
styles: [],
customBlocks: [],
cssVars: [],
slotted: false,
shouldForceReload: prevImports => hmrShouldReload(prevImports, descriptor)
}
const errors: (CompilerError | SyntaxError)[] = []
const ast = compiler.parse(source, {
// there are no components at SFC parsing level
isNativeTag: () => true,
// preserve all whitespaces
isPreTag: () => true,
getTextMode: ({ tag, props }, parent) => {
// all top level elements except <template> are parsed as raw text
// containers
if (
(!parent && tag !== 'template') ||
// <template lang="xxx"> should also be treated as raw text
(tag === 'template' &&
props.some(
p =>
p.type === NodeTypes.ATTRIBUTE &&
p.name === 'lang' &&
p.value &&
p.value.content &&
p.value.content !== 'html'
))
) {
return TextModes.RAWTEXT
} else {
return TextModes.DATA
}
},
onError: e => {
errors.push(e)
}
})
ast.children.forEach(node => {
Iif (node.type !== NodeTypes.ELEMENT) {
return
}
// we only want to keep the nodes that are not empty (when the tag is not a template)
if (
ignoreEmpty &&
node.tag !== 'template' &&
isEmpty(node) &&
!hasSrc(node)
) {
return
}
switch (node.tag) {
case 'template':
if (!descriptor.template) {
const templateBlock = (descriptor.template = createBlock(
node,
source,
false
) as SFCTemplateBlock)
templateBlock.ast = node
// warn against 2.x <template functional>
Iif (templateBlock.attrs.functional) {
const err = new SyntaxError(
`<template functional> is no longer supported in Vue 3, since ` +
`functional components no longer have significant performance ` +
`difference from stateful ones. Just use a normal <template> ` +
`instead.`
) as CompilerError
err.loc = node.props.find(p => p.name === 'functional')!.loc
errors.push(err)
}
} else {
errors.push(createDuplicateBlockError(node))
}
break
case 'script':
const scriptBlock = createBlock(node, source, pad) as SFCScriptBlock
const isSetup = !!scriptBlock.attrs.setup
if (isSetup && !descriptor.scriptSetup) {
descriptor.scriptSetup = scriptBlock
break
}
if (!isSetup && !descriptor.script) {
descriptor.script = scriptBlock
break
}
errors.push(createDuplicateBlockError(node, isSetup))
break
case 'style':
const styleBlock = createBlock(node, source, pad) as SFCStyleBlock
Iif (styleBlock.attrs.vars) {
errors.push(
new SyntaxError(
`<style vars> has been replaced by a new proposal: ` +
`https://github.com/vuejs/rfcs/pull/231`
)
)
}
descriptor.styles.push(styleBlock)
break
default:
descriptor.customBlocks.push(createBlock(node, source, pad))
break
}
})
if (descriptor.scriptSetup) {
Iif (descriptor.scriptSetup.src) {
errors.push(
new SyntaxError(
`<script setup> cannot use the "src" attribute because ` +
`its syntax will be ambiguous outside of the component.`
)
)
descriptor.scriptSetup = null
}
Iif (descriptor.script && descriptor.script.src) {
errors.push(
new SyntaxError(
`<script> cannot use the "src" attribute when <script setup> is ` +
`also present because they must be processed together.`
)
)
descriptor.script = null
}
}
if (sourceMap) {
const genMap = (block: SFCBlock | null) => {
if (block && !block.src) {
block.map = generateSourceMap(
filename,
source,
block.content,
sourceRoot,
!pad || block.type === 'template' ? block.loc.start.line - 1 : 0
)
}
}
genMap(descriptor.template)
genMap(descriptor.script)
descriptor.styles.forEach(genMap)
descriptor.customBlocks.forEach(genMap)
}
// parse CSS vars
descriptor.cssVars = parseCssVars(descriptor)
// check if the SFC uses :slotted
const slottedRE = /(?:::v-|:)slotted\(/
descriptor.slotted = descriptor.styles.some(
s => s.scoped && slottedRE.test(s.content)
)
const result = {
descriptor,
errors
}
sourceToSFC.set(sourceKey, result)
return result
}
function createDuplicateBlockError(
node: ElementNode,
isScriptSetup = false
): CompilerError {
const err = new SyntaxError(
`Single file component can contain only one <${node.tag}${
isScriptSetup ? ` setup` : ``
}> element`
) as CompilerError
err.loc = node.loc
return err
}
function createBlock(
node: ElementNode,
source: string,
pad: SFCParseOptions['pad']
): SFCBlock {
const type = node.tag
let { start, end } = node.loc
let content = ''
if (node.children.length) {
start = node.children[0].loc.start
end = node.children[node.children.length - 1].loc.end
content = source.slice(start.offset, end.offset)
} else {
const offset = node.loc.source.indexOf(`</`)
if (offset > -1) {
start = {
line: start.line,
column: start.column + offset,
offset: start.offset + offset
}
}
end = { ...start }
}
const loc = {
source: content,
start,
end
}
const attrs: Record<string, string | true> = {}
const block: SFCBlock = {
type,
content,
loc,
attrs
}
if (pad) {
block.content = padContent(source, block, pad) + block.content
}
node.props.forEach(p => {
if (p.type === NodeTypes.ATTRIBUTE) {
attrs[p.name] = p.value ? p.value.content || true : true
if (p.name === 'lang') {
block.lang = p.value && p.value.content
} else if (p.name === 'src') {
block.src = p.value && p.value.content
} else if (type === 'style') {
if (p.name === 'scoped') {
;(block as SFCStyleBlock).scoped = true
} else IEif (p.name === 'module') {
;(block as SFCStyleBlock).module = attrs[p.name]
}
} else if (type === 'script' && p.name === 'setup') {
;(block as SFCScriptBlock).setup = attrs.setup
}
}
})
return block
}
const splitRE = /\r?\n/g
const emptyRE = /^(?:\/\/)?\s*$/
const replaceRE = /./g
function generateSourceMap(
filename: string,
source: string,
generated: string,
sourceRoot: string,
lineOffset: number
): RawSourceMap {
const map = new SourceMapGenerator({
file: filename.replace(/\\/g, '/'),
sourceRoot: sourceRoot.replace(/\\/g, '/')
})
map.setSourceContent(filename, source)
generated.split(splitRE).forEach((line, index) => {
if (!emptyRE.test(line)) {
const originalLine = index + 1 + lineOffset
const generatedLine = index + 1
for (let i = 0; i < line.length; i++) {
if (!/\s/.test(line[i])) {
map.addMapping({
source: filename,
original: {
line: originalLine,
column: i
},
generated: {
line: generatedLine,
column: i
}
})
}
}
}
})
return JSON.parse(map.toString())
}
function padContent(
content: string,
block: SFCBlock,
pad: SFCParseOptions['pad']
): string {
content = content.slice(0, block.loc.start.offset)
if (pad === 'space') {
return content.replace(replaceRE, ' ')
} else {
const offset = content.split(splitRE).length
const padChar = block.type === 'script' && !block.lang ? '//\n' : '\n'
return Array(offset).join(padChar)
}
}
function hasSrc(node: ElementNode) {
return node.props.some(p => {
Iif (p.type !== NodeTypes.ATTRIBUTE) {
return false
}
return p.name === 'src'
})
}
/**
* Returns true if the node has no children
* once the empty text nodes (trimmed content) have been filtered out.
*/
function isEmpty(node: ElementNode) {
for (let i = 0; i < node.children.length; i++) {
const child = node.children[i]
if (child.type !== NodeTypes.TEXT || child.content.trim() !== '') {
return false
}
}
return true
}
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