/
LogicalExpression.ts
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/
LogicalExpression.ts
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import MagicString from 'magic-string';
import { BLANK } from '../../utils/blank';
import {
findFirstOccurrenceOutsideComment,
findNonWhiteSpace,
NodeRenderOptions,
removeLineBreaks,
RenderOptions
} from '../../utils/renderHelpers';
import { removeAnnotations } from '../../utils/treeshakeNode';
import { CallOptions } from '../CallOptions';
import { DeoptimizableEntity } from '../DeoptimizableEntity';
import { HasEffectsContext, InclusionContext } from '../ExecutionContext';
import { NodeEvent } from '../NodeEvents';
import {
EMPTY_PATH,
ObjectPath,
PathTracker,
SHARED_RECURSION_TRACKER,
UNKNOWN_PATH
} from '../utils/PathTracker';
import * as NodeType from './NodeType';
import { ExpressionEntity, LiteralValueOrUnknown, UnknownValue } from './shared/Expression';
import { MultiExpression } from './shared/MultiExpression';
import { ExpressionNode, IncludeChildren, NodeBase } from './shared/Node';
export type LogicalOperator = '||' | '&&' | '??';
export default class LogicalExpression extends NodeBase implements DeoptimizableEntity {
left!: ExpressionNode;
operator!: LogicalOperator;
right!: ExpressionNode;
type!: NodeType.tLogicalExpression;
// We collect deoptimization information if usedBranch !== null
private expressionsToBeDeoptimized: DeoptimizableEntity[] = [];
private isBranchResolutionAnalysed = false;
private usedBranch: ExpressionNode | null = null;
deoptimizeCache(): void {
if (this.usedBranch !== null) {
const unusedBranch = this.usedBranch === this.left ? this.right : this.left;
this.usedBranch = null;
unusedBranch.deoptimizePath(UNKNOWN_PATH);
for (const expression of this.expressionsToBeDeoptimized) {
expression.deoptimizeCache();
}
}
}
deoptimizePath(path: ObjectPath): void {
const usedBranch = this.getUsedBranch();
if (usedBranch === null) {
this.left.deoptimizePath(path);
this.right.deoptimizePath(path);
} else {
usedBranch.deoptimizePath(path);
}
}
deoptimizeThisOnEventAtPath(
event: NodeEvent,
path: ObjectPath,
thisParameter: ExpressionEntity,
recursionTracker: PathTracker
): void {
this.left.deoptimizeThisOnEventAtPath(event, path, thisParameter, recursionTracker);
this.right.deoptimizeThisOnEventAtPath(event, path, thisParameter, recursionTracker);
}
getLiteralValueAtPath(
path: ObjectPath,
recursionTracker: PathTracker,
origin: DeoptimizableEntity
): LiteralValueOrUnknown {
const usedBranch = this.getUsedBranch();
if (usedBranch === null) return UnknownValue;
this.expressionsToBeDeoptimized.push(origin);
return usedBranch.getLiteralValueAtPath(path, recursionTracker, origin);
}
getReturnExpressionWhenCalledAtPath(
path: ObjectPath,
callOptions: CallOptions,
recursionTracker: PathTracker,
origin: DeoptimizableEntity
): ExpressionEntity {
const usedBranch = this.getUsedBranch();
if (usedBranch === null)
return new MultiExpression([
this.left.getReturnExpressionWhenCalledAtPath(path, callOptions, recursionTracker, origin),
this.right.getReturnExpressionWhenCalledAtPath(path, callOptions, recursionTracker, origin)
]);
this.expressionsToBeDeoptimized.push(origin);
return usedBranch.getReturnExpressionWhenCalledAtPath(
path,
callOptions,
recursionTracker,
origin
);
}
hasEffects(context: HasEffectsContext): boolean {
if (this.left.hasEffects(context)) {
return true;
}
if (this.getUsedBranch() !== this.left) {
return this.right.hasEffects(context);
}
return false;
}
hasEffectsWhenAccessedAtPath(path: ObjectPath, context: HasEffectsContext): boolean {
const usedBranch = this.getUsedBranch();
if (usedBranch === null) {
return (
this.left.hasEffectsWhenAccessedAtPath(path, context) ||
this.right.hasEffectsWhenAccessedAtPath(path, context)
);
}
return usedBranch.hasEffectsWhenAccessedAtPath(path, context);
}
hasEffectsWhenAssignedAtPath(path: ObjectPath, context: HasEffectsContext): boolean {
const usedBranch = this.getUsedBranch();
if (usedBranch === null) {
return (
this.left.hasEffectsWhenAssignedAtPath(path, context) ||
this.right.hasEffectsWhenAssignedAtPath(path, context)
);
}
return usedBranch.hasEffectsWhenAssignedAtPath(path, context);
}
hasEffectsWhenCalledAtPath(
path: ObjectPath,
callOptions: CallOptions,
context: HasEffectsContext
): boolean {
const usedBranch = this.getUsedBranch();
if (usedBranch === null) {
return (
this.left.hasEffectsWhenCalledAtPath(path, callOptions, context) ||
this.right.hasEffectsWhenCalledAtPath(path, callOptions, context)
);
}
return usedBranch.hasEffectsWhenCalledAtPath(path, callOptions, context);
}
include(context: InclusionContext, includeChildrenRecursively: IncludeChildren): void {
this.included = true;
const usedBranch = this.getUsedBranch();
if (
includeChildrenRecursively ||
(usedBranch === this.right && this.left.shouldBeIncluded(context)) ||
usedBranch === null
) {
this.left.include(context, includeChildrenRecursively);
this.right.include(context, includeChildrenRecursively);
} else {
usedBranch.include(context, includeChildrenRecursively);
}
}
render(
code: MagicString,
options: RenderOptions,
{
isCalleeOfRenderedParent,
preventASI,
renderedParentType,
renderedSurroundingElement
}: NodeRenderOptions = BLANK
): void {
if (!this.left.included || !this.right.included) {
const operatorPos = findFirstOccurrenceOutsideComment(
code.original,
this.operator,
this.left.end
);
if (this.right.included) {
const removePos = findNonWhiteSpace(code.original, operatorPos + 2);
code.remove(this.start, removePos);
if (preventASI) {
removeLineBreaks(code, removePos, this.right.start);
}
} else {
code.remove(operatorPos, this.end);
}
removeAnnotations(this, code);
this.getUsedBranch()!.render(code, options, {
isCalleeOfRenderedParent,
preventASI,
renderedParentType: renderedParentType || this.parent.type,
renderedSurroundingElement: renderedSurroundingElement || this.parent.type
});
} else {
this.left.render(code, options, {
preventASI,
renderedSurroundingElement
});
this.right.render(code, options);
}
}
private getUsedBranch() {
if (!this.isBranchResolutionAnalysed) {
this.isBranchResolutionAnalysed = true;
const leftValue = this.left.getLiteralValueAtPath(EMPTY_PATH, SHARED_RECURSION_TRACKER, this);
if (leftValue === UnknownValue) {
return null;
} else {
this.usedBranch =
(this.operator === '||' && leftValue) ||
(this.operator === '&&' && !leftValue) ||
(this.operator === '??' && leftValue != null)
? this.left
: this.right;
}
}
return this.usedBranch;
}
}