component.js

import { warn } from './debug'
import { resolveAsset } from './options'
import { getAttr, getBindAttr } from './dom'
import { isArray, isPlainObject } from './lang'

export const commonTagRE = /^(div|p|span|img|a|b|i|br|ul|ol|li|h1|h2|h3|h4|h5|h6|code|pre|table|th|td|tr|form|label|input|select|option|nav|article|section|header|footer)$/

/**
 * Check if an element is a component, if yes return its
 * component id.
 *
 * @param {Element} el
 * @param {Object} options
 * @return {Object|undefined}
 */

export function checkComponentAttr (el, options) {
  var tag = el.tagName.toLowerCase()
  var hasAttrs = el.hasAttributes()
  if (!commonTagRE.test(tag) && tag !== 'component') {
    if (resolveAsset(options, 'components', tag)) {
      return { id: tag }
    } else {
      var is = hasAttrs && getIsBinding(el)
      if (is) {
        return is
      } else if (process.env.NODE_ENV !== 'production') {
        if (
          tag.indexOf('-') > -1 ||
          (
            /HTMLUnknownElement/.test(el.toString()) &&
            // Chrome returns unknown for several HTML5 elements.
            // https://code.google.com/p/chromium/issues/detail?id=540526
            !/^(data|time|rtc|rb)$/.test(tag)
          )
        ) {
          warn(
            'Unknown custom element: <' + tag + '> - did you ' +
            'register the component correctly?'
          )
        }
      }
    }
  } else if (hasAttrs) {
    return getIsBinding(el)
  }
}

/**
 * Get "is" binding from an element.
 *
 * @param {Element} el
 * @return {Object|undefined}
 */

function getIsBinding (el) {
  // dynamic syntax
  var exp = getAttr(el, 'is')
  if (exp != null) {
    return { id: exp }
  } else {
    exp = getBindAttr(el, 'is')
    if (exp != null) {
      return { id: exp, dynamic: true }
    }
  }
}

/**
 * Set a prop's initial value on a vm and its data object.
 *
 * @param {Vue} vm
 * @param {Object} prop
 * @param {*} value
 */

export function initProp (vm, prop, value) {
  const key = prop.path
  vm[key] = vm._data[key] = assertProp(prop, value)
    ? value
    : undefined
}

/**
 * Assert whether a prop is valid.
 *
 * @param {Object} prop
 * @param {*} value
 */

export function assertProp (prop, value) {
  // if a prop is not provided and is not required,
  // skip the check.
  if (prop.raw === null && !prop.required) {
    return true
  }
  var options = prop.options
  var type = options.type
  var valid = true
  var expectedType
  if (type) {
    if (type === String) {
      expectedType = 'string'
      valid = typeof value === expectedType
    } else if (type === Number) {
      expectedType = 'number'
      valid = typeof value === 'number'
    } else if (type === Boolean) {
      expectedType = 'boolean'
      valid = typeof value === 'boolean'
    } else if (type === Function) {
      expectedType = 'function'
      valid = typeof value === 'function'
    } else if (type === Object) {
      expectedType = 'object'
      valid = isPlainObject(value)
    } else if (type === Array) {
      expectedType = 'array'
      valid = isArray(value)
    } else {
      valid = value instanceof type
    }
  }
  if (!valid) {
    process.env.NODE_ENV !== 'production' && warn(
      'Invalid prop: type check failed for ' +
      prop.path + '="' + prop.raw + '".' +
      ' Expected ' + formatType(expectedType) +
      ', got ' + formatValue(value) + '.'
    )
    return false
  }
  var validator = options.validator
  if (validator) {
    if (!validator.call(null, value)) {
      process.env.NODE_ENV !== 'production' && warn(
        'Invalid prop: custom validator check failed for ' +
        prop.path + '="' + prop.raw + '"'
      )
      return false
    }
  }
  return true
}

function formatType (val) {
  return val
    ? val.charAt(0).toUpperCase() + val.slice(1)
    : 'custom type'
}

function formatValue (val) {
  return Object.prototype.toString.call(val).slice(8, -1)
}