vue的for和if优先级源码
export function genElement(el: ASTElement, state: CodegenState): string {
if (el.parent) {
el.pre = el.pre || el.parent.pre
}
if (el.staticRoot && !el.staticProcessed) {
return genStatic(el, state)
} else if (el.once && !el.onceProcessed) {
return genOnce(el, state)
} else if (el.for && !el.forProcessed) {
return genFor(el, state)
} else if (el.if && !el.ifProcessed) {
return genIf(el, state)
} else if (el.tag === 'template' && !el.slotTarget && !state.pre) {
return genChildren(el, state) || 'void 0'
} else if (el.tag === 'slot') {
return genSlot(el, state)
} else {
// component or element
let code
if (el.component) {
code = genComponent(el.component, el, state)
} else {
let data
const maybeComponent = state.maybeComponent(el)
if (!el.plain || (el.pre && maybeComponent)) {
data = genData(el, state)
}
let tag: string | undefined
// check if this is a component in <script setup>
const bindings = state.options.bindings
if (maybeComponent && bindings && bindings.__isScriptSetup !== false) {
tag = checkBindingType(bindings, el.tag)
}
if (!tag) tag = `'${el.tag}'`
const children = el.inlineTemplate ? null : genChildren(el, state, true)
code = `_c(${tag}${
data ? `,${data}` : '' // data
}${
children ? `,${children}` : '' // children
})`
}
// module transforms
for (let i = 0; i < state.transforms.length; i++) {
code = state.transforms[i](el, code)
}
return code
}
}
