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type BlockCodegenNode,
type CacheExpression,
type CallExpression,
type DirectiveNode,
type ElementNode,
ElementTypes,
type ExpressionNode,
type IfBranchNode,
type InterpolationNode,
type JSChildNode,
type MemoExpression,
NodeTypes,
type ObjectExpression,
type Position,
type Property,
type RenderSlotCall,
type RootNode,
type SimpleExpressionNode,
type SlotOutletNode,
type TemplateChildNode,
type TemplateNode,
type TextNode,
type VNodeCall,
createCallExpression,
createObjectExpression,
} from './ast'
import type { TransformContext } from './transform'
import {
BASE_TRANSITION,
GUARD_REACTIVE_PROPS,
KEEP_ALIVE,
MERGE_PROPS,
NORMALIZE_PROPS,
SUSPENSE,
TELEPORT,
TO_HANDLERS,
WITH_MEMO,
} from './runtimeHelpers'
import { NOOP, isObject, isString } from '@vue/shared'
import type { PropsExpression } from './transforms/transformElement'
import { parseExpression } from '@babel/parser'
import type { Expression, Node } from '@babel/types'
import { unwrapTSNode } from './babelUtils'
import { isWhitespace } from './tokenizer'
export const isStaticExp = (p: JSChildNode): p is SimpleExpressionNode =>
p.type === NodeTypes.SIMPLE_EXPRESSION && p.isStatic
export function isCoreComponent(tag: string): symbol | void {
switch (tag) {
case 'Teleport':
case 'teleport':
return TELEPORT
case 'Suspense':
case 'suspense':
return SUSPENSE
case 'KeepAlive':
case 'keep-alive':
return KEEP_ALIVE
case 'BaseTransition':
case 'base-transition':
return BASE_TRANSITION
}
}
const nonIdentifierRE = /^$|^\d|[^\$\w\xA0-\uFFFF]/
export const isSimpleIdentifier = (name: string): boolean =>
!nonIdentifierRE.test(name)
enum MemberExpLexState {
inMemberExp,
inBrackets,
inParens,
inString,
}
export const validFirstIdentCharRE: RegExp = /[A-Za-z_$\xA0-\uFFFF]/
const validIdentCharRE = /[\.\?\w$\xA0-\uFFFF]/
const whitespaceRE = /\s+[.[]\s*|\s*[.[]\s+/g
const getExpSource = (exp: ExpressionNode): string =>
exp.type === NodeTypes.SIMPLE_EXPRESSION ? exp.content : exp.loc.source
/**
* 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 = (exp: ExpressionNode): boolean => {
// remove whitespaces around . or [ first
const path = getExpSource(exp)
.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
I} else if (char === `(`) {
currentOpenParensCount++
E} else if (char === `)`) {
// if the exp ends as a call then it should not be considered valid
if (i === path.length - 1) {
return false
}
Eif (!--currentOpenParensCount) {
state = stateStack.pop()!
}
}
break
case MemberExpLexState.inString:
if (char === currentStringType) {
state = stateStack.pop()!
currentStringType = null
}
break
}
}
return !currentOpenBracketCount && !currentOpenParensCount
}
export const isMemberExpressionNode: (
exp: ExpressionNode,
context: TransformContext,
) => boolean = __BROWSER__
? (NOOP as any)
: (exp, context) => {
try {
let ret: Node =
exp.ast ||
parseExpression(getExpSource(exp), {
plugins: context.expressionPlugins
? [...context.expressionPlugins, 'typescript']
: ['typescript'],
})
ret = unwrapTSNode(ret) as Expression
return (
ret.type === 'MemberExpression' ||
ret.type === 'OptionalMemberExpression' ||
(ret.type === 'Identifier' && ret.name !== 'undefined')
)
} catch (e) {
return false
}
}
export const isMemberExpression: (
exp: ExpressionNode,
context: TransformContext,
) => boolean = __BROWSER__ ? isMemberExpressionBrowser : isMemberExpressionNode
const fnExpRE =
/^\s*(?:async\s*)?(?:\([^)]*?\)|[\w$_]+)\s*(?::[^=]+)?=>|^\s*(?:async\s+)?function(?:\s+[\w$]+)?\s*\(/
export const isFnExpressionBrowser: (exp: ExpressionNode) => boolean = exp =>
fnExpRE.test(getExpSource(exp))
export const isFnExpressionNode: (
exp: ExpressionNode,
context: TransformContext,
) => boolean = __BROWSER__
? (NOOP as any)
: (exp, context) => {
try {
let ret: Node =
exp.ast ||
parseExpression(getExpSource(exp), {
plugins: context.expressionPlugins
? [...context.expressionPlugins, 'typescript']
: ['typescript'],
})
// parser may parse the exp as statements when it contains semicolons
if (ret.type === 'Program') {
ret = ret.body[0]
if (ret.type === 'ExpressionStatement') {
ret = ret.expression
}
}
ret = unwrapTSNode(ret) as Expression
return (
ret.type === 'FunctionExpression' ||
ret.type === 'ArrowFunctionExpression'
)
} catch (e) {
return false
}
}
export const isFnExpression: (
exp: ExpressionNode,
context: TransformContext,
) => boolean = __BROWSER__ ? isFnExpressionBrowser : isFnExpressionNode
export function advancePositionWithClone(
pos: Position,
source: string,
numberOfCharacters: number = source.length,
): Position {
return advancePositionWithMutation(
{
offset: pos.offset,
line: pos.line,
column: pos.column,
},
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): void {
/* v8 ignore next 3 */
Iif (!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 isVPre(p: ElementNode['props'][0]): p is DirectiveNode {
return p.type === NodeTypes.DIRECTIVE && p.name === 'pre'
}
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
}
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,
): void {
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
Eif (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
Eif (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
| CacheExpression
| 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:
if (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:
case NodeTypes.JS_CACHE_EXPRESSION:
return false
default:
if (__DEV__) {
const exhaustiveCheck: never = node
exhaustiveCheck
}
return false
}
}
export function getMemoedVNodeCall(
node: BlockCodegenNode | MemoExpression,
): VNodeCall | RenderSlotCall {
if (node.type === NodeTypes.JS_CALL_EXPRESSION && node.callee === WITH_MEMO) {
return node.arguments[1].returns as VNodeCall
} else {
return node
}
}
export const forAliasRE: RegExp = /([\s\S]*?)\s+(?:in|of)\s+(\S[\s\S]*)/
export function isAllWhitespace(str: string): boolean {
for (let i = 0; i < str.length; i++) {
if (!isWhitespace(str.charCodeAt(i))) {
return false
}
}
return true
}
export function isWhitespaceText(node: TemplateChildNode): boolean {
return (
(node.type === NodeTypes.TEXT && isAllWhitespace(node.content)) ||
(node.type === NodeTypes.TEXT_CALL && isWhitespaceText(node.content))
)
}
export function isCommentOrWhitespace(node: TemplateChildNode): boolean {
return node.type === NodeTypes.COMMENT || isWhitespaceText(node)
}
|