Process from Vue template to render

ZevLin 2021-05-03 20:51:42
process vue template render


process analysis

Vue The template compilation process of is as follows :template->ast->render function .

Vue In template compilation compileToFunctions take template Turn into render function .

// Compile the template as render function 
const { render, staticRenderFns } = compileToFunctions(template, options, this)
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1. call parse Methods will template Turn into ast( Abstract syntax tree )

const ast = parse(template.trim(), options)
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parse The goal of : It's a template Turn into AST, It is a kind of use JavaScript Object form to describe the syntax structure of the whole template .

Analytic process : Using regular expressions to parse templates , When parsing to the start tag 、 Closed label 、 The corresponding callback function will be executed when the text is read , To achieve construction AST The purpose of the tree .

AST There are three types of element nodes :type by 1 Represents a common element 、2 Expression for 、3 For plain text .

2. Optimize static nodes

optimize(ast, options)
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This process mainly analyzes which are static nodes , Mark it , For subsequent update rendering, you can directly skip static nodes for optimization .

Depth traversal AST: Check whether the node elements of each subtree are static nodes or static node roots . If it's a static node , They made it DOM Never change , This greatly optimizes the template update at runtime .

3. The generated code

const code = generate(ast, options)
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generate take ast The abstract syntax tree is compiled into render character string And put the static part in staticRenderFns in , Finally through new Function(render) Generate render function .

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