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import { ForParseResult } from './transforms/vFor'
import {
RENDER_SLOT,
CREATE_SLOTS,
RENDER_LIST,
OPEN_BLOCK,
FRAGMENT,
WITH_DIRECTIVES,
WITH_MEMO
} from './runtimeHelpers'
import { PropsExpression } from './transforms/transformElement'
import { ImportItem, TransformContext } from './transform'
import { getVNodeBlockHelper, getVNodeHelper } from './utils'
// Vue template is a platform-agnostic superset of HTML (syntax only).
// More namespaces like SVG and MathML are declared by platform specific
// compilers.
export type Namespace = number
export const enum Namespaces {
HTML
}
export const enum NodeTypes {
ROOT,
ELEMENT,
TEXT,
COMMENT,
SIMPLE_EXPRESSION,
INTERPOLATION,
ATTRIBUTE,
DIRECTIVE,
// containers
COMPOUND_EXPRESSION,
IF,
IF_BRANCH,
FOR,
TEXT_CALL,
// codegen
VNODE_CALL,
JS_CALL_EXPRESSION,
JS_OBJECT_EXPRESSION,
JS_PROPERTY,
JS_ARRAY_EXPRESSION,
JS_FUNCTION_EXPRESSION,
JS_CONDITIONAL_EXPRESSION,
JS_CACHE_EXPRESSION,
// ssr codegen
JS_BLOCK_STATEMENT,
JS_TEMPLATE_LITERAL,
JS_IF_STATEMENT,
JS_ASSIGNMENT_EXPRESSION,
JS_SEQUENCE_EXPRESSION,
JS_RETURN_STATEMENT
}
export const enum ElementTypes {
ELEMENT,
COMPONENT,
SLOT,
TEMPLATE
}
export interface Node {
type: NodeTypes
loc: SourceLocation
}
// The node's range. The `start` is inclusive and `end` is exclusive.
// [start, end)
export interface SourceLocation {
start: Position
end: Position
source: string
}
export interface Position {
offset: number // from start of file
line: number
column: number
}
export type ParentNode = RootNode | ElementNode | IfBranchNode | ForNode
export type ExpressionNode = SimpleExpressionNode | CompoundExpressionNode
export type TemplateChildNode =
| ElementNode
| InterpolationNode
| CompoundExpressionNode
| TextNode
| CommentNode
| IfNode
| IfBranchNode
| ForNode
| TextCallNode
export interface RootNode extends Node {
type: NodeTypes.ROOT
children: TemplateChildNode[]
helpers: symbol[]
components: string[]
directives: string[]
hoists: (JSChildNode | null)[]
imports: ImportItem[]
cached: number
temps: number
ssrHelpers?: symbol[]
codegenNode?: TemplateChildNode | JSChildNode | BlockStatement
// v2 compat only
filters?: string[]
}
export type ElementNode =
| PlainElementNode
| ComponentNode
| SlotOutletNode
| TemplateNode
export interface BaseElementNode extends Node {
type: NodeTypes.ELEMENT
ns: Namespace
tag: string
tagType: ElementTypes
isSelfClosing: boolean
props: Array<AttributeNode | DirectiveNode>
children: TemplateChildNode[]
}
export interface PlainElementNode extends BaseElementNode {
tagType: ElementTypes.ELEMENT
codegenNode:
| VNodeCall
| SimpleExpressionNode // when hoisted
| CacheExpression // when cached by v-once
| MemoExpression // when cached by v-memo
| undefined
ssrCodegenNode?: TemplateLiteral
}
export interface ComponentNode extends BaseElementNode {
tagType: ElementTypes.COMPONENT
codegenNode:
| VNodeCall
| CacheExpression // when cached by v-once
| MemoExpression // when cached by v-memo
| undefined
ssrCodegenNode?: CallExpression
}
export interface SlotOutletNode extends BaseElementNode {
tagType: ElementTypes.SLOT
codegenNode:
| RenderSlotCall
| CacheExpression // when cached by v-once
| undefined
ssrCodegenNode?: CallExpression
}
export interface TemplateNode extends BaseElementNode {
tagType: ElementTypes.TEMPLATE
// TemplateNode is a container type that always gets compiled away
codegenNode: undefined
}
export interface TextNode extends Node {
type: NodeTypes.TEXT
content: string
}
export interface CommentNode extends Node {
type: NodeTypes.COMMENT
content: string
}
export interface AttributeNode extends Node {
type: NodeTypes.ATTRIBUTE
name: string
value: TextNode | undefined
}
export interface DirectiveNode extends Node {
type: NodeTypes.DIRECTIVE
name: string
exp: ExpressionNode | undefined
arg: ExpressionNode | undefined
modifiers: string[]
/**
* optional property to cache the expression parse result for v-for
*/
parseResult?: ForParseResult
}
/**
* Static types have several levels.
* Higher levels implies lower levels. e.g. a node that can be stringified
* can always be hoisted and skipped for patch.
*/
export const enum ConstantTypes {
NOT_CONSTANT = 0,
CAN_SKIP_PATCH,
CAN_HOIST,
CAN_STRINGIFY
}
export interface SimpleExpressionNode extends Node {
type: NodeTypes.SIMPLE_EXPRESSION
content: string
isStatic: boolean
constType: ConstantTypes
/**
* Indicates this is an identifier for a hoist vnode call and points to the
* hoisted node.
*/
hoisted?: JSChildNode
/**
* an expression parsed as the params of a function will track
* the identifiers declared inside the function body.
*/
identifiers?: string[]
isHandlerKey?: boolean
}
export interface InterpolationNode extends Node {
type: NodeTypes.INTERPOLATION
content: ExpressionNode
}
export interface CompoundExpressionNode extends Node {
type: NodeTypes.COMPOUND_EXPRESSION
children: (
| SimpleExpressionNode
| CompoundExpressionNode
| InterpolationNode
| TextNode
| string
| symbol
)[]
/**
* an expression parsed as the params of a function will track
* the identifiers declared inside the function body.
*/
identifiers?: string[]
isHandlerKey?: boolean
}
export interface IfNode extends Node {
type: NodeTypes.IF
branches: IfBranchNode[]
codegenNode?: IfConditionalExpression | CacheExpression // <div v-if v-once>
}
export interface IfBranchNode extends Node {
type: NodeTypes.IF_BRANCH
condition: ExpressionNode | undefined // else
children: TemplateChildNode[]
userKey?: AttributeNode | DirectiveNode
}
export interface ForNode extends Node {
type: NodeTypes.FOR
source: ExpressionNode
valueAlias: ExpressionNode | undefined
keyAlias: ExpressionNode | undefined
objectIndexAlias: ExpressionNode | undefined
parseResult: ForParseResult
children: TemplateChildNode[]
codegenNode?: ForCodegenNode
}
export interface TextCallNode extends Node {
type: NodeTypes.TEXT_CALL
content: TextNode | InterpolationNode | CompoundExpressionNode
codegenNode: CallExpression | SimpleExpressionNode // when hoisted
}
export type TemplateTextChildNode =
| TextNode
| InterpolationNode
| CompoundExpressionNode
export interface VNodeCall extends Node {
type: NodeTypes.VNODE_CALL
tag: string | symbol | CallExpression
props: PropsExpression | undefined
children:
| TemplateChildNode[] // multiple children
| TemplateTextChildNode // single text child
| SlotsExpression // component slots
| ForRenderListExpression // v-for fragment call
| SimpleExpressionNode // hoisted
| undefined
patchFlag: string | undefined
dynamicProps: string | SimpleExpressionNode | undefined
directives: DirectiveArguments | undefined
isBlock: boolean
disableTracking: boolean
isComponent: boolean
}
// JS Node Types ---------------------------------------------------------------
// We also include a number of JavaScript AST nodes for code generation.
// The AST is an intentionally minimal subset just to meet the exact needs of
// Vue render function generation.
export type JSChildNode =
| VNodeCall
| CallExpression
| ObjectExpression
| ArrayExpression
| ExpressionNode
| FunctionExpression
| ConditionalExpression
| CacheExpression
| AssignmentExpression
| SequenceExpression
export interface CallExpression extends Node {
type: NodeTypes.JS_CALL_EXPRESSION
callee: string | symbol
arguments: (
| string
| symbol
| JSChildNode
| SSRCodegenNode
| TemplateChildNode
| TemplateChildNode[]
)[]
}
export interface ObjectExpression extends Node {
type: NodeTypes.JS_OBJECT_EXPRESSION
properties: Array<Property>
}
export interface Property extends Node {
type: NodeTypes.JS_PROPERTY
key: ExpressionNode
value: JSChildNode
}
export interface ArrayExpression extends Node {
type: NodeTypes.JS_ARRAY_EXPRESSION
elements: Array<string | Node>
}
export interface FunctionExpression extends Node {
type: NodeTypes.JS_FUNCTION_EXPRESSION
params: ExpressionNode | string | (ExpressionNode | string)[] | undefined
returns?: TemplateChildNode | TemplateChildNode[] | JSChildNode
body?: BlockStatement | IfStatement
newline: boolean
/**
* This flag is for codegen to determine whether it needs to generate the
* withScopeId() wrapper
*/
isSlot: boolean
/**
* __COMPAT__ only, indicates a slot function that should be excluded from
* the legacy $scopedSlots instance property.
*/
isNonScopedSlot?: boolean
}
export interface ConditionalExpression extends Node {
type: NodeTypes.JS_CONDITIONAL_EXPRESSION
test: JSChildNode
consequent: JSChildNode
alternate: JSChildNode
newline: boolean
}
export interface CacheExpression extends Node {
type: NodeTypes.JS_CACHE_EXPRESSION
index: number
value: JSChildNode
isVNode: boolean
}
export interface MemoExpression extends CallExpression {
callee: typeof WITH_MEMO
arguments: [ExpressionNode, MemoFactory, string, string]
}
interface MemoFactory extends FunctionExpression {
returns: BlockCodegenNode
}
// SSR-specific Node Types -----------------------------------------------------
export type SSRCodegenNode =
| BlockStatement
| TemplateLiteral
| IfStatement
| AssignmentExpression
| ReturnStatement
| SequenceExpression
export interface BlockStatement extends Node {
type: NodeTypes.JS_BLOCK_STATEMENT
body: (JSChildNode | IfStatement)[]
}
export interface TemplateLiteral extends Node {
type: NodeTypes.JS_TEMPLATE_LITERAL
elements: (string | JSChildNode)[]
}
export interface IfStatement extends Node {
type: NodeTypes.JS_IF_STATEMENT
test: ExpressionNode
consequent: BlockStatement
alternate: IfStatement | BlockStatement | ReturnStatement | undefined
}
export interface AssignmentExpression extends Node {
type: NodeTypes.JS_ASSIGNMENT_EXPRESSION
left: SimpleExpressionNode
right: JSChildNode
}
export interface SequenceExpression extends Node {
type: NodeTypes.JS_SEQUENCE_EXPRESSION
expressions: JSChildNode[]
}
export interface ReturnStatement extends Node {
type: NodeTypes.JS_RETURN_STATEMENT
returns: TemplateChildNode | TemplateChildNode[] | JSChildNode
}
// Codegen Node Types ----------------------------------------------------------
export interface DirectiveArguments extends ArrayExpression {
elements: DirectiveArgumentNode[]
}
export interface DirectiveArgumentNode extends ArrayExpression {
elements: // dir, exp, arg, modifiers
| [string]
| [string, ExpressionNode]
| [string, ExpressionNode, ExpressionNode]
| [string, ExpressionNode, ExpressionNode, ObjectExpression]
}
// renderSlot(...)
export interface RenderSlotCall extends CallExpression {
callee: typeof RENDER_SLOT
arguments: // $slots, name, props, fallback
| [string, string | ExpressionNode]
| [string, string | ExpressionNode, PropsExpression]
| [
string,
string | ExpressionNode,
PropsExpression | '{}',
TemplateChildNode[]
]
}
export type SlotsExpression = SlotsObjectExpression | DynamicSlotsExpression
// { foo: () => [...] }
export interface SlotsObjectExpression extends ObjectExpression {
properties: SlotsObjectProperty[]
}
export interface SlotsObjectProperty extends Property {
value: SlotFunctionExpression
}
export interface SlotFunctionExpression extends FunctionExpression {
returns: TemplateChildNode[]
}
// createSlots({ ... }, [
// foo ? () => [] : undefined,
// renderList(list, i => () => [i])
// ])
export interface DynamicSlotsExpression extends CallExpression {
callee: typeof CREATE_SLOTS
arguments: [SlotsObjectExpression, DynamicSlotEntries]
}
export interface DynamicSlotEntries extends ArrayExpression {
elements: (ConditionalDynamicSlotNode | ListDynamicSlotNode)[]
}
export interface ConditionalDynamicSlotNode extends ConditionalExpression {
consequent: DynamicSlotNode
alternate: DynamicSlotNode | SimpleExpressionNode
}
export interface ListDynamicSlotNode extends CallExpression {
callee: typeof RENDER_LIST
arguments: [ExpressionNode, ListDynamicSlotIterator]
}
export interface ListDynamicSlotIterator extends FunctionExpression {
returns: DynamicSlotNode
}
export interface DynamicSlotNode extends ObjectExpression {
properties: [Property, DynamicSlotFnProperty]
}
export interface DynamicSlotFnProperty extends Property {
value: SlotFunctionExpression
}
export type BlockCodegenNode = VNodeCall | RenderSlotCall
export interface IfConditionalExpression extends ConditionalExpression {
consequent: BlockCodegenNode | MemoExpression
alternate: BlockCodegenNode | IfConditionalExpression | MemoExpression
}
export interface ForCodegenNode extends VNodeCall {
isBlock: true
tag: typeof FRAGMENT
props: undefined
children: ForRenderListExpression
patchFlag: string
disableTracking: boolean
}
export interface ForRenderListExpression extends CallExpression {
callee: typeof RENDER_LIST
arguments: [ExpressionNode, ForIteratorExpression]
}
export interface ForIteratorExpression extends FunctionExpression {
returns: BlockCodegenNode
}
// AST Utilities ---------------------------------------------------------------
// Some expressions, e.g. sequence and conditional expressions, are never
// associated with template nodes, so their source locations are just a stub.
// Container types like CompoundExpression also don't need a real location.
export const locStub: SourceLocation = {
source: '',
start: { line: 1, column: 1, offset: 0 },
end: { line: 1, column: 1, offset: 0 }
}
export function createRoot(
children: TemplateChildNode[],
loc = locStub
): RootNode {
return {
type: NodeTypes.ROOT,
children,
helpers: [],
components: [],
directives: [],
hoists: [],
imports: [],
cached: 0,
temps: 0,
codegenNode: undefined,
loc
}
}
export function createVNodeCall(
context: TransformContext | null,
tag: VNodeCall['tag'],
props?: VNodeCall['props'],
children?: VNodeCall['children'],
patchFlag?: VNodeCall['patchFlag'],
dynamicProps?: VNodeCall['dynamicProps'],
directives?: VNodeCall['directives'],
isBlock: VNodeCall['isBlock'] = false,
disableTracking: VNodeCall['disableTracking'] = false,
isComponent: VNodeCall['isComponent'] = false,
loc = locStub
): VNodeCall {
if (context) {
if (isBlock) {
context.helper(OPEN_BLOCK)
context.helper(getVNodeBlockHelper(context.inSSR, isComponent))
} else {
context.helper(getVNodeHelper(context.inSSR, isComponent))
}
if (directives) {
context.helper(WITH_DIRECTIVES)
}
}
return {
type: NodeTypes.VNODE_CALL,
tag,
props,
children,
patchFlag,
dynamicProps,
directives,
isBlock,
disableTracking,
isComponent,
loc
}
}
export function createArrayExpression(
elements: ArrayExpression['elements'],
loc: SourceLocation = locStub
): ArrayExpression {
return {
type: NodeTypes.JS_ARRAY_EXPRESSION,
loc,
elements
}
}
export function createObjectExpression(
properties: ObjectExpression['properties'],
loc: SourceLocation = locStub
): ObjectExpression {
return {
type: NodeTypes.JS_OBJECT_EXPRESSION,
loc,
properties
}
}
export function createObjectProperty(
key: Property['key'] | string,
value: Property['value']
): Property {
return {
type: NodeTypes.JS_PROPERTY,
loc: locStub,
key: isString(key) ? createSimpleExpression(key, true) : key,
value
}
}
export function createSimpleExpression(
content: SimpleExpressionNode['content'],
isStatic: SimpleExpressionNode['isStatic'] = false,
loc: SourceLocation = locStub,
constType: ConstantTypes = ConstantTypes.NOT_CONSTANT
): SimpleExpressionNode {
return {
type: NodeTypes.SIMPLE_EXPRESSION,
loc,
content,
isStatic,
constType: isStatic ? ConstantTypes.CAN_STRINGIFY : constType
}
}
export function createInterpolation(
content: InterpolationNode['content'] | string,
loc: SourceLocation
): InterpolationNode {
return {
type: NodeTypes.INTERPOLATION,
loc,
content: isString(content)
? createSimpleExpression(content, false, loc)
: content
}
}
export function createCompoundExpression(
children: CompoundExpressionNode['children'],
loc: SourceLocation = locStub
): CompoundExpressionNode {
return {
type: NodeTypes.COMPOUND_EXPRESSION,
loc,
children
}
}
type InferCodegenNodeType<T> = T extends typeof RENDER_SLOT
? RenderSlotCall
: CallExpression
export function createCallExpression<T extends CallExpression['callee']>(
callee: T,
args: CallExpression['arguments'] = [],
loc: SourceLocation = locStub
): InferCodegenNodeType<T> {
return {
type: NodeTypes.JS_CALL_EXPRESSION,
loc,
callee,
arguments: args
} as InferCodegenNodeType<T>
}
export function createFunctionExpression(
params: FunctionExpression['params'],
returns: FunctionExpression['returns'] = undefined,
newline: boolean = false,
isSlot: boolean = false,
loc: SourceLocation = locStub
): FunctionExpression {
return {
type: NodeTypes.JS_FUNCTION_EXPRESSION,
params,
returns,
newline,
isSlot,
loc
}
}
export function createConditionalExpression(
test: ConditionalExpression['test'],
consequent: ConditionalExpression['consequent'],
alternate: ConditionalExpression['alternate'],
newline = true
): ConditionalExpression {
return {
type: NodeTypes.JS_CONDITIONAL_EXPRESSION,
test,
consequent,
alternate,
newline,
loc: locStub
}
}
export function createCacheExpression(
index: number,
value: JSChildNode,
isVNode: boolean = false
): CacheExpression {
return {
type: NodeTypes.JS_CACHE_EXPRESSION,
index,
value,
isVNode,
loc: locStub
}
}
export function createBlockStatement(
body: BlockStatement['body']
): BlockStatement {
return {
type: NodeTypes.JS_BLOCK_STATEMENT,
body,
loc: locStub
}
}
export function createTemplateLiteral(
elements: TemplateLiteral['elements']
): TemplateLiteral {
return {
type: NodeTypes.JS_TEMPLATE_LITERAL,
elements,
loc: locStub
}
}
export function createIfStatement(
test: IfStatement['test'],
consequent: IfStatement['consequent'],
alternate?: IfStatement['alternate']
): IfStatement {
return {
type: NodeTypes.JS_IF_STATEMENT,
test,
consequent,
alternate,
loc: locStub
}
}
export function createAssignmentExpression(
left: AssignmentExpression['left'],
right: AssignmentExpression['right']
): AssignmentExpression {
return {
type: NodeTypes.JS_ASSIGNMENT_EXPRESSION,
left,
right,
loc: locStub
}
}
export function createSequenceExpression(
expressions: SequenceExpression['expressions']
): SequenceExpression {
return {
type: NodeTypes.JS_SEQUENCE_EXPRESSION,
expressions,
loc: locStub
}
}
export function createReturnStatement(
returns: ReturnStatement['returns']
): ReturnStatement {
return {
type: NodeTypes.JS_RETURN_STATEMENT,
returns,
loc: locStub
}
}
|