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

  }

}