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Expression.ts
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Expression.ts
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import type { DeoptimizableEntity } from '../../DeoptimizableEntity';
import type { WritableEntity } from '../../Entity';
import type { HasEffectsContext, InclusionContext } from '../../ExecutionContext';
import type { NodeInteraction, NodeInteractionCalled } from '../../NodeInteractions';
import type { ObjectPath, PathTracker, SymbolToStringTag } from '../../utils/PathTracker';
import { UNKNOWN_PATH } from '../../utils/PathTracker';
import type { LiteralValue } from '../Literal';
import type SpreadElement from '../SpreadElement';
import type { IncludeChildren } from './Node';
export const UnknownValue = Symbol('Unknown Value');
export const UnknownTruthyValue = Symbol('Unknown Truthy Value');
export type LiteralValueOrUnknown =
| LiteralValue
| typeof UnknownValue
| typeof UnknownTruthyValue
| typeof SymbolToStringTag;
export interface InclusionOptions {
/**
* Include the id of a declarator even if unused to ensure it is a valid
* statement.
*/
asSingleStatement?: boolean;
}
export class ExpressionEntity implements WritableEntity {
included = false;
deoptimizeArgumentsOnInteractionAtPath(
interaction: NodeInteraction,
_path: ObjectPath,
_recursionTracker: PathTracker
): void {
deoptimizeInteraction(interaction);
}
deoptimizePath(_path: ObjectPath): void {}
/**
* If possible it returns a stringifyable literal value for this node that
* can be used for inlining or comparing values. Otherwise, it should return
* UnknownValue.
*/
getLiteralValueAtPath(
_path: ObjectPath,
_recursionTracker: PathTracker,
_origin: DeoptimizableEntity
): LiteralValueOrUnknown {
return UnknownValue;
}
getReturnExpressionWhenCalledAtPath(
_path: ObjectPath,
_interaction: NodeInteractionCalled,
_recursionTracker: PathTracker,
_origin: DeoptimizableEntity
): [expression: ExpressionEntity, isPure: boolean] {
return UNKNOWN_RETURN_EXPRESSION;
}
hasEffectsOnInteractionAtPath(
_path: ObjectPath,
_interaction: NodeInteraction,
_context: HasEffectsContext
): boolean {
return true;
}
include(
_context: InclusionContext,
_includeChildrenRecursively: IncludeChildren,
_options?: InclusionOptions
): void {
this.included = true;
}
includeCallArguments(
context: InclusionContext,
parameters: readonly (ExpressionEntity | SpreadElement)[]
): void {
for (const argument of parameters) {
argument.include(context, false);
}
}
shouldBeIncluded(_context: InclusionContext): boolean {
return true;
}
}
export const UNKNOWN_EXPRESSION: ExpressionEntity =
new (class UnknownExpression extends ExpressionEntity {})();
export const UNKNOWN_RETURN_EXPRESSION: [expression: ExpressionEntity, isPure: boolean] = [
UNKNOWN_EXPRESSION,
false
];
export const deoptimizeInteraction = (interaction: NodeInteraction) => {
for (const argument of interaction.args) {
argument?.deoptimizePath(UNKNOWN_PATH);
}
};