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import {
VueTemplateCompiler,
VueTemplateCompilerOptions,
ErrorWithRange
} from './types'
import assetUrlsModule, {
AssetURLOptions,
TransformAssetUrlsOptions
} from './templateCompilerModules/assetUrl'
import srcsetModule from './templateCompilerModules/srcset'
const consolidate = require('consolidate')
const transpile = require('vue-template-es2015-compiler')
export interface TemplateCompileOptions {
source: string
filename: string
compiler: VueTemplateCompiler
compilerOptions?: VueTemplateCompilerOptions
transformAssetUrls?: AssetURLOptions | boolean
transformAssetUrlsOptions?: TransformAssetUrlsOptions
preprocessLang?: string
preprocessOptions?: any
transpileOptions?: any
isProduction?: boolean
isFunctional?: boolean
optimizeSSR?: boolean
prettify?: boolean
}
export interface TemplateCompileResult {
ast: Object | undefined
code: string
source: string
tips: (string | ErrorWithRange)[]
errors: (string | ErrorWithRange)[]
}
export function compileTemplate(
options: TemplateCompileOptions
): TemplateCompileResult {
const { preprocessLang } = options
const preprocessor = preprocessLang && consolidate[preprocessLang]
if (preprocessor) {
return actuallyCompile(
Object.assign({}, options, {
source: preprocess(options, preprocessor)
})
)
} else if (preprocessLang) {
return {
ast: {},
code: `var render = function () {}\n` + `var staticRenderFns = []\n`,
source: options.source,
tips: [
`Component ${options.filename} uses lang ${preprocessLang} for template. Please install the language preprocessor.`
],
errors: [
`Component ${options.filename} uses lang ${preprocessLang} for template, however it is not installed.`
]
}
} else {
return actuallyCompile(options)
}
}
function preprocess(
options: TemplateCompileOptions,
preprocessor: any
): string {
const { source, filename, preprocessOptions } = options
const finalPreprocessOptions = Object.assign(
{
filename
},
preprocessOptions
)
// Consolidate exposes a callback based API, but the callback is in fact
// called synchronously for most templating engines. In our case, we have to
// expose a synchronous API so that it is usable in Jest transforms (which
// have to be sync because they are applied via Node.js require hooks)
let res: any, err
preprocessor.render(
source,
finalPreprocessOptions,
(_err: Error | null, _res: string) => {
if (_err) err = _err
res = _res
}
)
if (err) throw err
return res
}
function actuallyCompile(
options: TemplateCompileOptions
): TemplateCompileResult {
const {
source,
compiler,
compilerOptions = {},
transpileOptions = {},
transformAssetUrls,
transformAssetUrlsOptions,
isProduction = process.env.NODE_ENV === 'production',
isFunctional = false,
optimizeSSR = false,
prettify = true
} = options
const compile =
optimizeSSR && compiler.ssrCompile ? compiler.ssrCompile : compiler.compile
let finalCompilerOptions = compilerOptions
if (transformAssetUrls) {
const builtInModules = [
transformAssetUrls === true
? assetUrlsModule(undefined, transformAssetUrlsOptions)
: assetUrlsModule(transformAssetUrls, transformAssetUrlsOptions),
srcsetModule(transformAssetUrlsOptions)
]
finalCompilerOptions = Object.assign({}, compilerOptions, {
modules: [...builtInModules, ...(compilerOptions.modules || [])],
filename: options.filename
})
}
const { ast, render, staticRenderFns, tips, errors } = compile(
source,
finalCompilerOptions
)
if (errors && errors.length) {
return {
ast,
code: `var render = function () {}\n` + `var staticRenderFns = []\n`,
source,
tips,
errors
}
} else {
const finalTranspileOptions = Object.assign({}, transpileOptions, {
transforms: Object.assign({}, transpileOptions.transforms, {
stripWithFunctional: isFunctional
})
})
const toFunction = (code: string): string => {
return `function (${isFunctional ? `_h,_vm` : ``}) {${code}}`
}
// transpile code with vue-template-es2015-compiler, which is a forked
// version of Buble that applies ES2015 transforms + stripping `with` usage
let code =
transpile(
`var __render__ = ${toFunction(render)}\n` +
`var __staticRenderFns__ = [${staticRenderFns.map(toFunction)}]`,
finalTranspileOptions
) + `\n`
// #23 we use __render__ to avoid `render` not being prefixed by the
// transpiler when stripping with, but revert it back to `render` to
// maintain backwards compat
code = code.replace(/\s__(render|staticRenderFns)__\s/g, ' $1 ')
if (!isProduction) {
// mark with stripped (this enables Vue to use correct runtime proxy
// detection)
code += `render._withStripped = true`
if (prettify) {
try {
code = require('prettier').format(code, {
semi: false,
parser: 'babel'
})
} catch (e) {
if (e.code === 'MODULE_NOT_FOUND') {
tips.push(
'The `prettify` option is on, but the dependency `prettier` is not found.\n' +
'Please either turn off `prettify` or manually install `prettier`.'
)
}
tips.push(
`Failed to prettify component ${options.filename} template source after compilation.`
)
}
}
}
return {
ast,
code,
source,
tips,
errors
}
}
}
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