All files / runtime-core/src componentRenderUtils.ts

93.93% Statements 155/165
90.24% Branches 111/123
100% Functions 11/11
93.75% Lines 150/160

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 41984x           84x                   84x 84x 84x 84x   84x 84x 84x                     84x   84x 204x     84x                                     1979x       1979x 1979x 1976x     1979x 1979x     1826x 1826x                     1824x     153x   153x 136x   153x             6x 6x                 153x         2x 2x 2x           1979x 1979x 1979x         1x     1979x 1835x 1835x 1835x 94x 65x         2x         65x 29x 2x 2x 2x 2x 4x 4x   2x     2x     2x     2x 2x             2x 2x                         1979x           85x 85x 1x 1x           1x               1979x 3x           3x     1979x 54x           54x     1979x 1x   1978x     1979x 1979x                 84x     1x 1x 1x 1x     1x 1x 1x 1x 1x 1x   1x 1x       1x     84x       10x 14x 14x   14x 10x       10x             10x     84x   136x 68x 10x     136x     84x 2x 2x 2x       2x     84x 57x           84x         175x 175x 175x         175x 5x       170x 8x     162x 13x     3x   10x           10x 7x 7x 8x 8x       7x             149x 38x 36x     113x 35x   78x 7x   71x 1x   70x     3x               70x 70x 11x   59x 76x 76x       51x     8x     84x       633x 150x 150x      
import {
  ComponentInternalInstance,
  FunctionalComponent,
  Data,
  getComponentName
} from './component'
import {
  VNode,
  normalizeVNode,
  createVNode,
  Comment,
  cloneVNode,
  VNodeArrayChildren,
  isVNode,
  blockStack
} from './vnode'
import { handleError, ErrorCodes } from './errorHandling'
import { PatchFlags, ShapeFlags, isOn, isModelListener } from '@vue/shared'
import { warn } from './warning'
import { isHmrUpdating } from './hmr'
import { NormalizedProps } from './componentProps'
import { isEmitListener } from './componentEmits'
import { setCurrentRenderingInstance } from './componentRenderContext'
import {
  DeprecationTypes,
  isCompatEnabled,
  warnDeprecation
} from './compat/compatConfig'
 
/**
 * dev only flag to track whether $attrs was used during render.
 * If $attrs was used during render then the warning for failed attrs
 * fallthrough can be suppressed.
 */
let accessedAttrs: boolean = false
 
export function markAttrsAccessed() {
  accessedAttrs = true
}
 
export function renderComponentRoot(
  instance: ComponentInternalInstance
): VNode {
  const {
    type: Component,
    vnode,
    proxy,
    withProxy,
    props,
    propsOptions: [propsOptions],
    slots,
    attrs,
    emit,
    render,
    renderCache,
    data,
    setupState,
    ctx,
    inheritAttrs
  } = instance
 
  let result
  let fallthroughAttrs
  const prev = setCurrentRenderingInstance(instance)
  if (__DEV__) {
    accessedAttrs = false
  }
 
  try {
    if (vnode.shapeFlag & ShapeFlags.STATEFUL_COMPONENT) {
      // withProxy is a proxy with a different `has` trap only for
      // runtime-compiled render functions using `with` block.
      const proxyToUse = withProxy || proxy
      result = normalizeVNode(
        render!.call(
          proxyToUse,
          proxyToUse!,
          renderCache,
          props,
          setupState,
          data,
          ctx
        )
      )
      fallthroughAttrs = attrs
    } else {
      // functional
      const render = Component as FunctionalComponent
      // in dev, mark attrs accessed if optional props (attrs === props)
      if (__DEV__ && attrs === props) {
        markAttrsAccessed()
      }
      result = normalizeVNode(
        render.length > 1
          ? render(
              props,
              __DEV__
                ? {
                    get attrs() {
                      markAttrsAccessed()
                      return attrs
                    },
                    slots,
                    emit
                  }
                : { attrs, slots, emit }
            )
          : render(props, null as any /* we know it doesn't need it */)
      )
      fallthroughAttrs = Component.props
        ? attrs
        : getFunctionalFallthrough(attrs)
    }
  } catch (err) {
    blockStack.length = 0
    handleError(err, instance, ErrorCodes.RENDER_FUNCTION)
    result = createVNode(Comment)
  }
 
  // attr merging
  // in dev mode, comments are preserved, and it's possible for a template
  // to have comments along side the root element which makes it a fragment
  let root = result
  let setRoot: ((root: VNode) => void) | undefined = undefined
  if (
    __DEV__ &&
    result.patchFlag > 0 &&
    result.patchFlag & PatchFlags.DEV_ROOT_FRAGMENT
  ) {
    ;[root, setRoot] = getChildRoot(result)
  }
 
  if (fallthroughAttrs && inheritAttrs !== false) {
    const keys = Object.keys(fallthroughAttrs)
    const { shapeFlag } = root
    if (keys.length) {
      if (shapeFlag & (ShapeFlags.ELEMENT | ShapeFlags.COMPONENT)) {
        if (propsOptions && keys.some(isModelListener)) {
          // If a v-model listener (onUpdate:xxx) has a corresponding declared
          // prop, it indicates this component expects to handle v-model and
          // it should not fallthrough.
          // related: #1543, #1643, #1989
          fallthroughAttrs = filterModelListeners(
            fallthroughAttrs,
            propsOptions
          )
        }
        root = cloneVNode(root, fallthroughAttrs)
      } else if (__DEV__ && !accessedAttrs && root.type !== Comment) {
        const allAttrs = Object.keys(attrs)
        const eventAttrs: string[] = []
        const extraAttrs: string[] = []
        for (let i = 0, l = allAttrs.length; i < l; i++) {
          const key = allAttrs[i]
          if (isOn(key)) {
            // ignore v-model handlers when they fail to fallthrough
            if (!isModelListener(key)) {
              // remove `on`, lowercase first letter to reflect event casing
              // accurately
              eventAttrs.push(key[2].toLowerCase() + key.slice(3))
            }
          } else {
            extraAttrs.push(key)
          }
        }
        if (extraAttrs.length) {
          warn(
            `Extraneous non-props attributes (` +
              `${extraAttrs.join(', ')}) ` +
              `were passed to component but could not be automatically inherited ` +
              `because component renders fragment or text root nodes.`
          )
        }
        if (eventAttrs.length) {
          warn(
            `Extraneous non-emits event listeners (` +
              `${eventAttrs.join(', ')}) ` +
              `were passed to component but could not be automatically inherited ` +
              `because component renders fragment or text root nodes. ` +
              `If the listener is intended to be a component custom event listener only, ` +
              `declare it using the "emits" option.`
          )
        }
      }
    }
  }
 
  if (
    __COMPAT__ &&
    isCompatEnabled(DeprecationTypes.INSTANCE_ATTRS_CLASS_STYLE, instance) &&
    vnode.shapeFlag & ShapeFlags.STATEFUL_COMPONENT &&
    root.shapeFlag & (ShapeFlags.ELEMENT | ShapeFlags.COMPONENT)
  ) {
    const { class: cls, style } = vnode.props || {}
    if (cls || style) {
      if (__DEV__ && inheritAttrs === false) {
        warnDeprecation(
          DeprecationTypes.INSTANCE_ATTRS_CLASS_STYLE,
          instance,
          getComponentName(instance.type)
        )
      }
      root = cloneVNode(root, {
        class: cls,
        style: style
      })
    }
  }
 
  // inherit directives
  if (vnode.dirs) {
    Iif (__DEV__ && !isElementRoot(root)) {
      warn(
        `Runtime directive used on component with non-element root node. ` +
          `The directives will not function as intended.`
      )
    }
    root.dirs = root.dirs ? root.dirs.concat(vnode.dirs) : vnode.dirs
  }
  // inherit transition data
  if (vnode.transition) {
    Iif (__DEV__ && !isElementRoot(root)) {
      warn(
        `Component inside <Transition> renders non-element root node ` +
          `that cannot be animated.`
      )
    }
    root.transition = vnode.transition
  }
 
  if (__DEV__ && setRoot) {
    setRoot(root)
  } else {
    result = root
  }
 
  setCurrentRenderingInstance(prev)
  return result
}
 
/**
 * dev only
 * In dev mode, template root level comments are rendered, which turns the
 * template into a fragment root, but we need to locate the single element
 * root for attrs and scope id processing.
 */
const getChildRoot = (
  vnode: VNode
): [VNode, ((root: VNode) => void) | undefined] => {
  const rawChildren = vnode.children as VNodeArrayChildren
  const dynamicChildren = vnode.dynamicChildren
  const childRoot = filterSingleRoot(rawChildren)
  Iif (!childRoot) {
    return [vnode, undefined]
  }
  const index = rawChildren.indexOf(childRoot)
  const dynamicIndex = dynamicChildren ? dynamicChildren.indexOf(childRoot) : -1
  const setRoot = (updatedRoot: VNode) => {
    rawChildren[index] = updatedRoot
    if (dynamicChildren) {
      Iif (dynamicIndex > -1) {
        dynamicChildren[dynamicIndex] = updatedRoot
      } else if (updatedRoot.patchFlag > 0) {
        vnode.dynamicChildren = [...dynamicChildren, updatedRoot]
      }
    }
  }
  return [normalizeVNode(childRoot), setRoot]
}
 
export function filterSingleRoot(
  children: VNodeArrayChildren
): VNode | undefined {
  let singleRoot
  for (let i = 0; i < children.length; i++) {
    const child = children[i]
    if (isVNode(child)) {
      // ignore user comment
      if (child.type !== Comment || child.children === 'v-if') {
        Iif (singleRoot) {
          // has more than 1 non-comment child, return now
          return
        } else {
          singleRoot = child
        }
      }
    } else E{
      return
    }
  }
  return singleRoot
}
 
const getFunctionalFallthrough = (attrs: Data): Data | undefined => {
  let res: Data | undefined
  for (const key in attrs) {
    if (key === 'class' || key === 'style' || isOn(key)) {
      ;(res || (res = {}))[key] = attrs[key]
    }
  }
  return res
}
 
const filterModelListeners = (attrs: Data, props: NormalizedProps): Data => {
  const res: Data = {}
  for (const key in attrs) {
    Iif (!isModelListener(key) || !(key.slice(9) in props)) {
      res[key] = attrs[key]
    }
  }
  return res
}
 
const isElementRoot = (vnode: VNode) => {
  return (
    vnode.shapeFlag & (ShapeFlags.COMPONENT | ShapeFlags.ELEMENT) ||
    vnode.type === Comment // potential v-if branch switch
  )
}
 
export function shouldUpdateComponent(
  prevVNode: VNode,
  nextVNode: VNode,
  optimized?: boolean
): boolean {
  const { props: prevProps, children: prevChildren, component } = prevVNode
  const { props: nextProps, children: nextChildren, patchFlag } = nextVNode
  const emits = component!.emitsOptions
 
  // Parent component's render function was hot-updated. Since this may have
  // caused the child component's slots content to have changed, we need to
  // force the child to update as well.
  if (__DEV__ && (prevChildren || nextChildren) && isHmrUpdating) {
    return true
  }
 
  // force child update for runtime directive or transition on component vnode.
  if (nextVNode.dirs || nextVNode.transition) {
    return true
  }
 
  if (optimized && patchFlag >= 0) {
    if (patchFlag & PatchFlags.DYNAMIC_SLOTS) {
      // slot content that references values that might have changed,
      // e.g. in a v-for
      return true
    }
    Iif (patchFlag & PatchFlags.FULL_PROPS) {
      Iif (!prevProps) {
        return !!nextProps
      }
      // presence of this flag indicates props are always non-null
      return hasPropsChanged(prevProps, nextProps!, emits)
    } else if (patchFlag & PatchFlags.PROPS) {
      const dynamicProps = nextVNode.dynamicProps!
      for (let i = 0; i < dynamicProps.length; i++) {
        const key = dynamicProps[i]
        if (
          nextProps![key] !== prevProps![key] &&
          !isEmitListener(emits, key)
        ) {
          return true
        }
      }
    }
  } else {
    // this path is only taken by manually written render functions
    // so presence of any children leads to a forced update
    if (prevChildren || nextChildren) {
      if (!nextChildren || !(nextChildren as any).$stable) {
        return true
      }
    }
    if (prevProps === nextProps) {
      return false
    }
    if (!prevProps) {
      return !!nextProps
    }
    if (!nextProps) {
      return true
    }
    return hasPropsChanged(prevProps, nextProps, emits)
  }
 
  return false
}
 
function hasPropsChanged(
  prevProps: Data,
  nextProps: Data,
  emitsOptions: ComponentInternalInstance['emitsOptions']
): boolean {
  const nextKeys = Object.keys(nextProps)
  if (nextKeys.length !== Object.keys(prevProps).length) {
    return true
  }
  for (let i = 0; i < nextKeys.length; i++) {
    const key = nextKeys[i]
    if (
      nextProps[key] !== prevProps[key] &&
      !isEmitListener(emitsOptions, key)
    ) {
      return true
    }
  }
  return false
}
 
export function updateHOCHostEl(
  { vnode, parent }: ComponentInternalInstance,
  el: typeof vnode.el // HostNode
) {
  while (parent && parent.subTree === vnode) {
    ;(vnode = parent.vnode).el = el
    parent = parent.parent
  }
}