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Expression.ts
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Expression.ts
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import { CallOptions } from '../../CallOptions';
import { DeoptimizableEntity } from '../../DeoptimizableEntity';
import { WritableEntity } from '../../Entity';
import { HasEffectsContext, InclusionContext } from '../../ExecutionContext';
import { NodeEvent } from '../../NodeEvents';
import { ObjectPath, PathTracker, UNKNOWN_PATH } from '../../utils/PathTracker';
import { LiteralValue } from '../Literal';
import SpreadElement from '../SpreadElement';
import { ExpressionNode, IncludeChildren } from './Node';
export const UnknownValue = Symbol('Unknown Value');
export type LiteralValueOrUnknown = LiteralValue | typeof UnknownValue;
export class ExpressionEntity implements WritableEntity {
included = false;
deoptimizePath(_path: ObjectPath): void {}
deoptimizeThisOnEventAtPath(
_event: NodeEvent,
_path: ObjectPath,
thisParameter: ExpressionEntity,
_recursionTracker: PathTracker
): void {
thisParameter.deoptimizePath(UNKNOWN_PATH);
}
/**
* 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,
_callOptions: CallOptions,
_recursionTracker: PathTracker,
_origin: DeoptimizableEntity
): ExpressionEntity {
return UNKNOWN_EXPRESSION;
}
hasEffectsWhenAccessedAtPath(_path: ObjectPath, _context: HasEffectsContext): boolean {
return true;
}
hasEffectsWhenAssignedAtPath(
_path: ObjectPath,
_context: HasEffectsContext,
_ignoreAccessors?: boolean
): boolean {
return true;
}
hasEffectsWhenCalledAtPath(
_path: ObjectPath,
_callOptions: CallOptions,
_context: HasEffectsContext
): boolean {
return true;
}
include(_context: InclusionContext, _includeChildrenRecursively: IncludeChildren): void {
this.included = true;
}
includeCallArguments(
context: InclusionContext,
args: readonly (ExpressionNode | SpreadElement)[]
): void {
for (const arg of args) {
arg.include(context, false);
}
}
}
export const UNKNOWN_EXPRESSION: ExpressionEntity =
new (class UnknownExpression extends ExpressionEntity {})();