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node_modules/@vue/component-compiler-utils/lib/parse.ts

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+import { SourceMapGenerator } from 'source-map'
+import {
+  RawSourceMap,
+  VueTemplateCompiler,
+  VueTemplateCompilerParseOptions
+} from './types'
+
+const hash = require('hash-sum')
+const cache = new (require('lru-cache'))(100)
+
+const splitRE = /\r?\n/g
+const emptyRE = /^(?:\/\/)?\s*$/
+
+export interface ParseOptions {
+  source: string
+  filename?: string
+  compiler: VueTemplateCompiler
+  compilerParseOptions?: VueTemplateCompilerParseOptions
+  sourceRoot?: string
+  needMap?: boolean
+}
+
+export interface SFCCustomBlock {
+  type: string
+  content: string
+  attrs: { [key: string]: string | true }
+  start: number
+  end: number
+  map?: RawSourceMap
+}
+
+export interface SFCBlock extends SFCCustomBlock {
+  lang?: string
+  src?: string
+  scoped?: boolean
+  module?: string | boolean
+}
+
+export interface SFCDescriptor {
+  template: SFCBlock | null
+  script: SFCBlock | null
+  styles: SFCBlock[]
+  customBlocks: SFCCustomBlock[]
+}
+
+export function parse(options: ParseOptions): SFCDescriptor {
+  const {
+    source,
+    filename = '',
+    compiler,
+    compilerParseOptions = { pad: 'line' } as VueTemplateCompilerParseOptions,
+    sourceRoot = '',
+    needMap = true
+  } = options
+  const cacheKey = hash(
+    filename + source + JSON.stringify(compilerParseOptions)
+  )
+  let output: SFCDescriptor = cache.get(cacheKey)
+  if (output) return output
+  output = compiler.parseComponent(source, compilerParseOptions)
+  if (needMap) {
+    if (output.script && !output.script.src) {
+      output.script.map = generateSourceMap(
+        filename,
+        source,
+        output.script.content,
+        sourceRoot,
+        compilerParseOptions.pad
+      )
+    }
+    if (output.styles) {
+      output.styles.forEach(style => {
+        if (!style.src) {
+          style.map = generateSourceMap(
+            filename,
+            source,
+            style.content,
+            sourceRoot,
+            compilerParseOptions.pad
+          )
+        }
+      })
+    }
+  }
+  cache.set(cacheKey, output)
+  return output
+}
+
+function generateSourceMap(
+  filename: string,
+  source: string,
+  generated: string,
+  sourceRoot: string,
+  pad?: 'line' | 'space'
+): RawSourceMap {
+  const map = new SourceMapGenerator({
+    file: filename.replace(/\\/g, '/'),
+    sourceRoot: sourceRoot.replace(/\\/g, '/')
+  })
+  let offset = 0
+  if (!pad) {
+    offset =
+      source
+        .split(generated)
+        .shift()!
+        .split(splitRE).length - 1
+  }
+  map.setSourceContent(filename, source)
+  generated.split(splitRE).forEach((line, index) => {
+    if (!emptyRE.test(line)) {
+      map.addMapping({
+        source: filename,
+        original: {
+          line: index + 1 + offset,
+          column: 0
+        },
+        generated: {
+          line: index + 1,
+          column: 0
+        }
+      })
+    }
+  })
+  return JSON.parse(map.toString())
+}