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SourceLocation,
Position,
ElementNode,
NodeTypes,
CallExpression,
createCallExpression,
DirectiveNode,
ElementTypes,
TemplateChildNode,
RootNode,
ObjectExpression,
Property,
JSChildNode,
createObjectExpression,
SlotOutletNode,
TemplateNode,
RenderSlotCall,
ExpressionNode,
IfBranchNode,
TextNode,
InterpolationNode,
VNodeCall,
SimpleExpressionNode,
BlockCodegenNode,
MemoExpression
} from './ast'
import { TransformContext } from './transform'
import {
MERGE_PROPS,
TELEPORT,
SUSPENSE,
KEEP_ALIVE,
BASE_TRANSITION,
TO_HANDLERS,
NORMALIZE_PROPS,
GUARD_REACTIVE_PROPS,
CREATE_BLOCK,
CREATE_ELEMENT_BLOCK,
CREATE_VNODE,
CREATE_ELEMENT_VNODE,
WITH_MEMO,
OPEN_BLOCK
} from './runtimeHelpers'
import { isString, isObject, hyphenate, extend, NOOP } from '@vue/shared'
import { PropsExpression } from './transforms/transformElement'
import { parseExpression } from '@babel/parser'
import { Expression } from '@babel/types'
export const isStaticExp = (p: JSChildNode): p is SimpleExpressionNode =>
p.type === NodeTypes.SIMPLE_EXPRESSION && p.isStatic
export const isBuiltInType = (tag: string, expected: string): boolean =>
tag === expected || tag === hyphenate(expected)
export function isCoreComponent(tag: string): symbol | void {
if (isBuiltInType(tag, 'Teleport')) {
return TELEPORT
} else if (isBuiltInType(tag, 'Suspense')) {
return SUSPENSE
} else if (isBuiltInType(tag, 'KeepAlive')) {
return KEEP_ALIVE
} else if (isBuiltInType(tag, 'BaseTransition')) {
return BASE_TRANSITION
}
}
const nonIdentifierRE = /^\d|[^\$\w]/
export const isSimpleIdentifier = (name: string): boolean =>
!nonIdentifierRE.test(name)
const enum MemberExpLexState {
inMemberExp,
inBrackets,
inParens,
inString
}
const validFirstIdentCharRE = /[A-Za-z_$\xA0-\uFFFF]/
const validIdentCharRE = /[\.\?\w$\xA0-\uFFFF]/
const whitespaceRE = /\s+[.[]\s*|\s*[.[]\s+/g
/**
* Simple lexer to check if an expression is a member expression. This is
* lax and only checks validity at the root level (i.e. does not validate exps
* inside square brackets), but it's ok since these are only used on template
* expressions and false positives are invalid expressions in the first place.
*/
export const isMemberExpressionBrowser = (path: string): boolean => {
// remove whitespaces around . or [ first
path = path.trim().replace(whitespaceRE, s => s.trim())
let state = MemberExpLexState.inMemberExp
let stateStack: MemberExpLexState[] = []
let currentOpenBracketCount = 0
let currentOpenParensCount = 0
let currentStringType: "'" | '"' | '`' | null = null
for (let i = 0; i < path.length; i++) {
const char = path.charAt(i)
switch (state) {
case MemberExpLexState.inMemberExp:
if (char === '[') {
stateStack.push(state)
state = MemberExpLexState.inBrackets
currentOpenBracketCount++
} else if (char === '(') {
stateStack.push(state)
state = MemberExpLexState.inParens
currentOpenParensCount++
} else if (
!(i === 0 ? validFirstIdentCharRE : validIdentCharRE).test(char)
) {
return false
}
break
case MemberExpLexState.inBrackets:
if (char === `'` || char === `"` || char === '`') {
stateStack.push(state)
state = MemberExpLexState.inString
currentStringType = char
} else if (char === `[`) {
currentOpenBracketCount++
} else if (char === `]`) {
if (!--currentOpenBracketCount) {
state = stateStack.pop()!
}
}
break
case MemberExpLexState.inParens:
Iif (char === `'` || char === `"` || char === '`') {
stateStack.push(state)
state = MemberExpLexState.inString
currentStringType = char
} else Iif (char === `(`) {
currentOpenParensCount++
} else if (char === `)`) {
// if the exp ends as a call then it should not be considered valid
if (i === path.length - 1) {
return false
}
if (!--currentOpenParensCount) {
state = stateStack.pop()!
}
}
break
case MemberExpLexState.inString:
if (char === currentStringType) {
state = stateStack.pop()!
currentStringType = null
}
break
}
}
return !currentOpenBracketCount && !currentOpenParensCount
}
export const isMemberExpressionNode = __BROWSER__
? (NOOP as any as (path: string, context: TransformContext) => boolean)
: (path: string, context: TransformContext): boolean => {
try {
let ret: Expression = parseExpression(path, {
plugins: context.expressionPlugins
})
if (ret.type === 'TSAsExpression' || ret.type === 'TSTypeAssertion') {
ret = ret.expression
}
return (
ret.type === 'MemberExpression' ||
ret.type === 'OptionalMemberExpression' ||
ret.type === 'Identifier'
)
} catch (e) {
return false
}
}
export const isMemberExpression = __BROWSER__
? isMemberExpressionBrowser
: isMemberExpressionNode
export function getInnerRange(
loc: SourceLocation,
offset: number,
length: number
): SourceLocation {
__TEST__ && assert(offset <= loc.source.length)
const source = loc.source.slice(offset, offset + length)
const newLoc: SourceLocation = {
source,
start: advancePositionWithClone(loc.start, loc.source, offset),
end: loc.end
}
if (length != null) {
__TEST__ && assert(offset + length <= loc.source.length)
newLoc.end = advancePositionWithClone(
loc.start,
loc.source,
offset + length
)
}
return newLoc
}
export function advancePositionWithClone(
pos: Position,
source: string,
numberOfCharacters: number = source.length
): Position {
return advancePositionWithMutation(
extend({}, pos),
source,
numberOfCharacters
)
}
// advance by mutation without cloning (for performance reasons), since this
// gets called a lot in the parser
export function advancePositionWithMutation(
pos: Position,
source: string,
numberOfCharacters: number = source.length
): Position {
let linesCount = 0
let lastNewLinePos = -1
for (let i = 0; i < numberOfCharacters; i++) {
if (source.charCodeAt(i) === 10 /* newline char code */) {
linesCount++
lastNewLinePos = i
}
}
pos.offset += numberOfCharacters
pos.line += linesCount
pos.column =
lastNewLinePos === -1
? pos.column + numberOfCharacters
: numberOfCharacters - lastNewLinePos
return pos
}
export function assert(condition: boolean, msg?: string) {
/* istanbul ignore if */
if (!condition) {
throw new Error(msg || `unexpected compiler condition`)
}
}
export function findDir(
node: ElementNode,
name: string | RegExp,
allowEmpty: boolean = false
): DirectiveNode | undefined {
for (let i = 0; i < node.props.length; i++) {
const p = node.props[i]
if (
p.type === NodeTypes.DIRECTIVE &&
(allowEmpty || p.exp) &&
(isString(name) ? p.name === name : name.test(p.name))
) {
return p
}
}
}
export function findProp(
node: ElementNode,
name: string,
dynamicOnly: boolean = false,
allowEmpty: boolean = false
): ElementNode['props'][0] | undefined {
for (let i = 0; i < node.props.length; i++) {
const p = node.props[i]
if (p.type === NodeTypes.ATTRIBUTE) {
Iif (dynamicOnly) continue
if (p.name === name && (p.value || allowEmpty)) {
return p
}
} else if (
p.name === 'bind' &&
(p.exp || allowEmpty) &&
isStaticArgOf(p.arg, name)
) {
return p
}
}
}
export function isStaticArgOf(
arg: DirectiveNode['arg'],
name: string
): boolean {
return !!(arg && isStaticExp(arg) && arg.content === name)
}
export function hasDynamicKeyVBind(node: ElementNode): boolean {
return node.props.some(
p =>
p.type === NodeTypes.DIRECTIVE &&
p.name === 'bind' &&
(!p.arg || // v-bind="obj"
p.arg.type !== NodeTypes.SIMPLE_EXPRESSION || // v-bind:[_ctx.foo]
!p.arg.isStatic) // v-bind:[foo]
)
}
export function isText(
node: TemplateChildNode
): node is TextNode | InterpolationNode {
return node.type === NodeTypes.INTERPOLATION || node.type === NodeTypes.TEXT
}
export function isVSlot(p: ElementNode['props'][0]): p is DirectiveNode {
return p.type === NodeTypes.DIRECTIVE && p.name === 'slot'
}
export function isTemplateNode(
node: RootNode | TemplateChildNode
): node is TemplateNode {
return (
node.type === NodeTypes.ELEMENT && node.tagType === ElementTypes.TEMPLATE
)
}
export function isSlotOutlet(
node: RootNode | TemplateChildNode
): node is SlotOutletNode {
return node.type === NodeTypes.ELEMENT && node.tagType === ElementTypes.SLOT
}
export function getVNodeHelper(ssr: boolean, isComponent: boolean) {
return ssr || isComponent ? CREATE_VNODE : CREATE_ELEMENT_VNODE
}
export function getVNodeBlockHelper(ssr: boolean, isComponent: boolean) {
return ssr || isComponent ? CREATE_BLOCK : CREATE_ELEMENT_BLOCK
}
const propsHelperSet = new Set([NORMALIZE_PROPS, GUARD_REACTIVE_PROPS])
function getUnnormalizedProps(
props: PropsExpression | '{}',
callPath: CallExpression[] = []
): [PropsExpression | '{}', CallExpression[]] {
if (
props &&
!isString(props) &&
props.type === NodeTypes.JS_CALL_EXPRESSION
) {
const callee = props.callee
if (!isString(callee) && propsHelperSet.has(callee)) {
return getUnnormalizedProps(
props.arguments[0] as PropsExpression,
callPath.concat(props)
)
}
}
return [props, callPath]
}
export function injectProp(
node: VNodeCall | RenderSlotCall,
prop: Property,
context: TransformContext
) {
let propsWithInjection: ObjectExpression | CallExpression | undefined
/**
* 1. mergeProps(...)
* 2. toHandlers(...)
* 3. normalizeProps(...)
* 4. normalizeProps(guardReactiveProps(...))
*
* we need to get the real props before normalization
*/
let props =
node.type === NodeTypes.VNODE_CALL ? node.props : node.arguments[2]
let callPath: CallExpression[] = []
let parentCall: CallExpression | undefined
if (
props &&
!isString(props) &&
props.type === NodeTypes.JS_CALL_EXPRESSION
) {
const ret = getUnnormalizedProps(props)
props = ret[0]
callPath = ret[1]
parentCall = callPath[callPath.length - 1]
}
if (props == null || isString(props)) {
propsWithInjection = createObjectExpression([prop])
} else if (props.type === NodeTypes.JS_CALL_EXPRESSION) {
// merged props... add ours
// only inject key to object literal if it's the first argument so that
// if doesn't override user provided keys
const first = props.arguments[0] as string | JSChildNode
if (!isString(first) && first.type === NodeTypes.JS_OBJECT_EXPRESSION) {
// #6631
if (!hasProp(prop, first)) {
first.properties.unshift(prop)
}
} else {
if (props.callee === TO_HANDLERS) {
// #2366
propsWithInjection = createCallExpression(context.helper(MERGE_PROPS), [
createObjectExpression([prop]),
props
])
} else {
props.arguments.unshift(createObjectExpression([prop]))
}
}
!propsWithInjection && (propsWithInjection = props)
} else if (props.type === NodeTypes.JS_OBJECT_EXPRESSION) {
if (!hasProp(prop, props)) {
props.properties.unshift(prop)
}
propsWithInjection = props
} else {
// single v-bind with expression, return a merged replacement
propsWithInjection = createCallExpression(context.helper(MERGE_PROPS), [
createObjectExpression([prop]),
props
])
// in the case of nested helper call, e.g. `normalizeProps(guardReactiveProps(props))`,
// it will be rewritten as `normalizeProps(mergeProps({ key: 0 }, props))`,
// the `guardReactiveProps` will no longer be needed
if (parentCall && parentCall.callee === GUARD_REACTIVE_PROPS) {
parentCall = callPath[callPath.length - 2]
}
}
if (node.type === NodeTypes.VNODE_CALL) {
if (parentCall) {
parentCall.arguments[0] = propsWithInjection
} else {
node.props = propsWithInjection
}
} else {
Iif (parentCall) {
parentCall.arguments[0] = propsWithInjection
} else {
node.arguments[2] = propsWithInjection
}
}
}
// check existing key to avoid overriding user provided keys
function hasProp(prop: Property, props: ObjectExpression) {
let result = false
if (prop.key.type === NodeTypes.SIMPLE_EXPRESSION) {
const propKeyName = prop.key.content
result = props.properties.some(
p =>
p.key.type === NodeTypes.SIMPLE_EXPRESSION &&
p.key.content === propKeyName
)
}
return result
}
export function toValidAssetId(
name: string,
type: 'component' | 'directive' | 'filter'
): string {
// see issue#4422, we need adding identifier on validAssetId if variable `name` has specific character
return `_${type}_${name.replace(/[^\w]/g, (searchValue, replaceValue) => {
return searchValue === '-' ? '_' : name.charCodeAt(replaceValue).toString()
})}`
}
// Check if a node contains expressions that reference current context scope ids
export function hasScopeRef(
node: TemplateChildNode | IfBranchNode | ExpressionNode | undefined,
ids: TransformContext['identifiers']
): boolean {
if (!node || Object.keys(ids).length === 0) {
return false
}
switch (node.type) {
case NodeTypes.ELEMENT:
for (let i = 0; i < node.props.length; i++) {
const p = node.props[i]
if (
p.type === NodeTypes.DIRECTIVE &&
(hasScopeRef(p.arg, ids) || hasScopeRef(p.exp, ids))
) {
return true
}
}
return node.children.some(c => hasScopeRef(c, ids))
case NodeTypes.FOR:
Iif (hasScopeRef(node.source, ids)) {
return true
}
return node.children.some(c => hasScopeRef(c, ids))
case NodeTypes.IF:
return node.branches.some(b => hasScopeRef(b, ids))
case NodeTypes.IF_BRANCH:
Iif (hasScopeRef(node.condition, ids)) {
return true
}
return node.children.some(c => hasScopeRef(c, ids))
case NodeTypes.SIMPLE_EXPRESSION:
return (
!node.isStatic &&
isSimpleIdentifier(node.content) &&
!!ids[node.content]
)
case NodeTypes.COMPOUND_EXPRESSION:
return node.children.some(c => isObject(c) && hasScopeRef(c, ids))
case NodeTypes.INTERPOLATION:
case NodeTypes.TEXT_CALL:
return hasScopeRef(node.content, ids)
case NodeTypes.TEXT:
case NodeTypes.COMMENT:
return false
default:
Iif (__DEV__) {
const exhaustiveCheck: never = node
exhaustiveCheck
}
return false
}
}
export function getMemoedVNodeCall(node: BlockCodegenNode | MemoExpression) {
if (node.type === NodeTypes.JS_CALL_EXPRESSION && node.callee === WITH_MEMO) {
return node.arguments[1].returns as VNodeCall
} else {
return node
}
}
export function makeBlock(
node: VNodeCall,
{ helper, removeHelper, inSSR }: TransformContext
) {
if (!node.isBlock) {
node.isBlock = true
removeHelper(getVNodeHelper(inSSR, node.isComponent))
helper(OPEN_BLOCK)
helper(getVNodeBlockHelper(inSSR, node.isComponent))
}
}
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