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