vue2从template到render模板编译入口详解_vue.js_

const idToTemplate = cached(id => { const el = query(id) return el && el.innerHTML }) const mount = Vue.prototype.$mount Vue.prototype.$mount = function ( el?: string | Element, hydrating?: boolean ): Component { el = el && query(el) /* istanbul ignore if */ if (el === document.body || el === document.documentElement) { process.env.NODE_ENV !== 'production' && warn( `Do not mount Vue to  or  - mount to normal elements instead.` ) return this } const options = this.$options // resolve template/el and convert to render function if (!options.render) { let template = options.template if (template) { if (typeof template === 'string') { if (template.charAt(0) === '#') { template = idToTemplate(template) /* istanbul ignore if */ if (process.env.NODE_ENV !== 'production' && !template) { warn( `Template element not found or is empty: ${options.template}`, this ) } } } else if (template.nodeType) { template = template.innerHTML } else { if (process.env.NODE_ENV !== 'production') { warn('invalid template option:' + template, this) } return this } } else if (el) { template = getOuterHTML(el) } if (template) { /* istanbul ignore if */ if (process.env.NODE_ENV !== 'production' && config.performance && mark) { mark('compile') } const { render, staticRenderFns } = compileToFunctions(template, { outputSourceRange: process.env.NODE_ENV !== 'production', shouldDecodeNewlines, shouldDecodeNewlinesForHref, delimiters: options.delimiters, comments: options.comments }, this) options.render = render options.staticRenderFns = staticRenderFns /* istanbul ignore if */ if (process.env.NODE_ENV !== 'production' && config.performance && mark) { mark('compile end') measure(`vue ${this._name} compile`, 'compile', 'compile end') } } } return mount.call(this, el, hydrating) } /** * Get outerHTML of elements, taking care * of SVG elements in IE as well. */ function getOuterHTML (el: Element): string { if (el.outerHTML) { return el.outerHTML } else { const container = document.createElement('div') container.appendChild(el.cloneNode(true)) return container.innerHTML } } 

import { baseOptions } from './options' import { createCompiler } from 'compiler/index' const { compile, compileToFunctions } = createCompiler(baseOptions) export { compile, compileToFunctions } 

import { parse } from './parser/index' import { optimize } from './optimizer' import { generate } from './codegen/index' import { createCompilerCreator } from './create-compiler' export const createCompiler = createCompilerCreator(function baseCompile ( template: string, options: CompilerOptions ): CompiledResult { const ast = parse(template.trim(), options) if (options.optimize !== false) { optimize(ast, options) } const code = generate(ast, options) return { ast, render: code.render, staticRenderFns: code.staticRenderFns } }) 

export function createCompilerCreator (baseCompile: Function): Function { return function createCompiler (baseOptions: CompilerOptions) { function compile ( template: string, options?: CompilerOptions ): CompiledResult { // ... } return { compile, compileToFunctions: createCompileToFunctionFn(compile) } } } 

function createFunction (code, errors) { try { return new Function(code) } catch (err) { errors.push({ err, code }) return noop } } export function createCompileToFunctionFn (compile: Function): Function { const cache = Object.create(null) return function compileToFunctions ( template: string, options?: CompilerOptions, vm?: Component ): CompiledFunctionResult { options = extend({}, options) const warn = options.warn || baseWarn delete options.warn /* istanbul ignore if */ if (process.env.NODE_ENV !== 'production') { // detect possible CSP restriction try { new Function('return 1') } catch (e) { if (e.toString().match(/unsafe-eval|CSP/)) { warn( 'It seems you are using the standalone build of Vue.js in an ' + 'environment with Content Security Policy that prohibits unsafe-eval. ' + 'The template compiler cannot work in this environment. Consider ' + 'relaxing the policy to allow unsafe-eval or pre-compiling your ' + 'templates into render functions.' ) } } } // check cache const key = options.delimiters ? String(options.delimiters) + template : template if (cache[key]) { return cache[key] } // compile const compiled = compile(template, options) // ... // turn code into functions const res = {} const fnGenErrors = [] res.render = createFunction(compiled.render, fnGenErrors) res.staticRenderFns = compiled.staticRenderFns.map(code => { return createFunction(code, fnGenErrors) }) // check function generation errors. // this should only happen if there is a bug in the compiler itself. // mostly for codegen development use /* istanbul ignore if */ if (process.env.NODE_ENV !== 'production') { if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) { warn( `Failed to generate render function:\n\n` + fnGenErrors.map(({ err, code }) => `${err.toString()} in\n\n$[code]\n`).join('\n'), vm ) } } return (cache[key] = res) } } 

function compile ( template: string, options?: CompilerOptions ): CompiledResult { const finalOptions = Object.create(baseOptions) const errors = [] const tips = [] let warn = (msg, range, tip) => { (tip ? tips : errors).push(msg) } if (options) { if (process.env.NODE_ENV !== 'production' && options.outputSourceRange) { // $flow-disable-line const leadingSpaceLength = template.match(/^\s*/)[0].length warn = (msg, range, tip) => { const data: WarningMessage = { msg } if (range) { if (range.start != null) { data.start = range.start + leadingSpaceLength } if (range.end != null) { data.end = range.end + leadingSpaceLength } } (tip ? tips : errors).push(data) } } // merge custom modules if (options.modules) { finalOptions.modules = (baseOptions.modules || []).concat(options.modules) } // merge custom directives if (options.directives) { finalOptions.directives = extend( Object.create(baseOptions.directives || null), options.directives ) } // copy other options for (const key in options) { if (key !== 'modules' && key !== 'directives') { finalOptions[key] = options[key] } } } finalOptions.warn = warn const compiled = baseCompile(template.trim(), finalOptions) if (process.env.NODE_ENV !== 'production') { detectErrors(compiled.ast, warn) } compiled.errors = errors compiled.tips = tips return compiled }