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import {
ConstantTypes,
ElementTypes,
type ExpressionNode,
NodeTypes,
type Property,
createCompoundExpression,
createObjectProperty,
createSimpleExpression,
} from '../ast'
import { ErrorCodes, createCompilerError } from '../errors'
import {
hasScopeRef,
isMemberExpression,
isSimpleIdentifier,
isStaticExp,
} from '../utils'
import { IS_REF } from '../runtimeHelpers'
import { BindingTypes } from '../options'
import { camelize } from '@vue/shared'
export const transformModel: DirectiveTransform = (dir, node, context) => {
const { exp, arg } = dir
if (!exp) {
context.onError(
createCompilerError(ErrorCodes.X_V_MODEL_NO_EXPRESSION, dir.loc),
)
return createTransformProps()
}
// we assume v-model directives are always parsed
// (not artificially created by a transform)
const rawExp = exp.loc.source.trim()
const expString =
exp.type === NodeTypes.SIMPLE_EXPRESSION ? exp.content : rawExp
// im SFC <script setup> inline mode, the exp may have been transformed into
// _unref(exp)
const bindingType = context.bindingMetadata[rawExp]
// check props
if (
bindingType === BindingTypes.PROPS ||
bindingType === BindingTypes.PROPS_ALIASED
) {
context.onError(createCompilerError(ErrorCodes.X_V_MODEL_ON_PROPS, exp.loc))
return createTransformProps()
}
const maybeRef =
!__BROWSER__ &&
context.inline &&
(bindingType === BindingTypes.SETUP_LET ||
bindingType === BindingTypes.SETUP_REF ||
bindingType === BindingTypes.SETUP_MAYBE_REF)
if (!expString.trim() || (!isMemberExpression(exp, context) && !maybeRef)) {
context.onError(
createCompilerError(ErrorCodes.X_V_MODEL_MALFORMED_EXPRESSION, exp.loc),
)
return createTransformProps()
}
if (
!__BROWSER__ &&
context.prefixIdentifiers &&
isSimpleIdentifier(expString) &&
context.identifiers[expString]
) {
context.onError(
createCompilerError(ErrorCodes.X_V_MODEL_ON_SCOPE_VARIABLE, exp.loc),
)
return createTransformProps()
}
const propName = arg ? arg : createSimpleExpression('modelValue', true)
const eventName = arg
? isStaticExp(arg)
? `onUpdate:${camelize(arg.content)}`
: createCompoundExpression(['"onUpdate:" + ', arg])
: `onUpdate:modelValue`
let assignmentExp: ExpressionNode
const eventArg = context.isTS ? `($event: any)` : `$event`
if (maybeRef) {
if (bindingType === BindingTypes.SETUP_REF) {
// v-model used on known ref.
assignmentExp = createCompoundExpression([
`${eventArg} => ((`,
createSimpleExpression(rawExp, false, exp.loc),
`).value = $event)`,
])
} else {
// v-model used on a potentially ref binding in <script setup> inline mode.
// the assignment needs to check whether the binding is actually a ref.
const altAssignment =
bindingType === BindingTypes.SETUP_LET ? `${rawExp} = $event` : `null`
assignmentExp = createCompoundExpression([
`${eventArg} => (${context.helperString(IS_REF)}(${rawExp}) ? (`,
createSimpleExpression(rawExp, false, exp.loc),
`).value = $event : ${altAssignment})`,
])
}
} else {
assignmentExp = createCompoundExpression([
`${eventArg} => ((`,
exp,
`) = $event)`,
])
}
const props = [
// modelValue: foo
createObjectProperty(propName, dir.exp!),
// "onUpdate:modelValue": $event => (foo = $event)
createObjectProperty(eventName, assignmentExp),
]
// cache v-model handler if applicable (when it doesn't refer any scope vars)
if (
!__BROWSER__ &&
context.prefixIdentifiers &&
!context.inVOnce &&
context.cacheHandlers &&
!hasScopeRef(exp, context.identifiers)
) {
props[1].value = context.cache(props[1].value)
}
// modelModifiers: { foo: true, "bar-baz": true }
if (dir.modifiers.length && node.tagType === ElementTypes.COMPONENT) {
const modifiers = dir.modifiers
.map(m => m.content)
.map(m => (isSimpleIdentifier(m) ? m : JSON.stringify(m)) + `: true`)
.join(`, `)
const modifiersKey = arg
? isStaticExp(arg)
? `${arg.content}Modifiers`
: createCompoundExpression([arg, ' + "Modifiers"'])
: `modelModifiers`
props.push(
createObjectProperty(
modifiersKey,
createSimpleExpression(
`{ ${modifiers} }`,
false,
dir.loc,
ConstantTypes.CAN_CACHE,
),
),
)
}
return createTransformProps(props)
}
function createTransformProps(props: Property[] = []) {
return { props }
}
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