parse.ts
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import { SourceMapGenerator } from 'source-map'
import { RawSourceMap, TemplateCompiler } from './types'
import {
parseComponent,
VueTemplateCompilerParseOptions,
SFCDescriptor,
DEFAULT_FILENAME
} from './parseComponent'
import hash from 'hash-sum'
import LRU from 'lru-cache'
import { hmrShouldReload } from './compileScript'
import { parseCssVars } from './cssVars'
const cache = new LRU<string, SFCDescriptor>(100)
const splitRE = /\r?\n/g
const emptyRE = /^(?:\/\/)?\s*$/
export interface SFCParseOptions {
source: string
filename?: string
compiler?: TemplateCompiler
compilerParseOptions?: VueTemplateCompilerParseOptions
sourceRoot?: string
sourceMap?: boolean
/**
* @deprecated use `sourceMap` instead.
*/
needMap?: boolean
}
export function parse(options: SFCParseOptions): SFCDescriptor {
const {
source,
filename = DEFAULT_FILENAME,
compiler,
compilerParseOptions = { pad: false } as VueTemplateCompilerParseOptions,
sourceRoot = '',
needMap = true,
sourceMap = needMap
} = options
const cacheKey = hash(
filename + source + JSON.stringify(compilerParseOptions)
)
let output = cache.get(cacheKey)
if (output) {
return output
}
if (compiler) {
// user-provided compiler
output = compiler.parseComponent(source, compilerParseOptions)
} else {
// use built-in compiler
output = parseComponent(source, compilerParseOptions)
}
output.filename = filename
// parse CSS vars
output.cssVars = parseCssVars(output)
output.shouldForceReload = prevImports =>
hmrShouldReload(prevImports, output!)
if (sourceMap) {
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' | boolean
): 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())
}