/
ConditionalExpression.ts
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/
ConditionalExpression.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 SpreadElement from './SpreadElement';
import { ExpressionEntity, LiteralValueOrUnknown, UnknownValue } from './shared/Expression';
import { MultiExpression } from './shared/MultiExpression';
import { ExpressionNode, IncludeChildren, NodeBase } from './shared/Node';
export default class ConditionalExpression extends NodeBase implements DeoptimizableEntity {
alternate!: ExpressionNode;
consequent!: ExpressionNode;
test!: ExpressionNode;
type!: NodeType.tConditionalExpression;
private expressionsToBeDeoptimized: DeoptimizableEntity[] = [];
private isBranchResolutionAnalysed = false;
private usedBranch: ExpressionNode | null = null;
deoptimizeCache(): void {
if (this.usedBranch !== null) {
const unusedBranch = this.usedBranch === this.consequent ? this.alternate : this.consequent;
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.consequent.deoptimizePath(path);
this.alternate.deoptimizePath(path);
} else {
usedBranch.deoptimizePath(path);
}
}
deoptimizeThisOnEventAtPath(
event: NodeEvent,
path: ObjectPath,
thisParameter: ExpressionEntity,
recursionTracker: PathTracker
): void {
this.consequent.deoptimizeThisOnEventAtPath(event, path, thisParameter, recursionTracker);
this.alternate.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.consequent.getReturnExpressionWhenCalledAtPath(
path,
callOptions,
recursionTracker,
origin
),
this.alternate.getReturnExpressionWhenCalledAtPath(
path,
callOptions,
recursionTracker,
origin
)
]);
this.expressionsToBeDeoptimized.push(origin);
return usedBranch.getReturnExpressionWhenCalledAtPath(
path,
callOptions,
recursionTracker,
origin
);
}
hasEffects(context: HasEffectsContext): boolean {
if (this.test.hasEffects(context)) return true;
const usedBranch = this.getUsedBranch();
if (usedBranch === null) {
return this.consequent.hasEffects(context) || this.alternate.hasEffects(context);
}
return usedBranch.hasEffects(context);
}
hasEffectsWhenAccessedAtPath(path: ObjectPath, context: HasEffectsContext): boolean {
const usedBranch = this.getUsedBranch();
if (usedBranch === null) {
return (
this.consequent.hasEffectsWhenAccessedAtPath(path, context) ||
this.alternate.hasEffectsWhenAccessedAtPath(path, context)
);
}
return usedBranch.hasEffectsWhenAccessedAtPath(path, context);
}
hasEffectsWhenAssignedAtPath(path: ObjectPath, context: HasEffectsContext): boolean {
const usedBranch = this.getUsedBranch();
if (usedBranch === null) {
return (
this.consequent.hasEffectsWhenAssignedAtPath(path, context) ||
this.alternate.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.consequent.hasEffectsWhenCalledAtPath(path, callOptions, context) ||
this.alternate.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 || this.test.shouldBeIncluded(context) || usedBranch === null) {
this.test.include(context, includeChildrenRecursively);
this.consequent.include(context, includeChildrenRecursively);
this.alternate.include(context, includeChildrenRecursively);
} else {
usedBranch.include(context, includeChildrenRecursively);
}
}
includeCallArguments(context: InclusionContext, args: (ExpressionNode | SpreadElement)[]): void {
const usedBranch = this.getUsedBranch();
if (usedBranch === null) {
this.consequent.includeCallArguments(context, args);
this.alternate.includeCallArguments(context, args);
} else {
usedBranch.includeCallArguments(context, args);
}
}
render(
code: MagicString,
options: RenderOptions,
{
isCalleeOfRenderedParent,
preventASI,
renderedParentType,
renderedSurroundingElement
}: NodeRenderOptions = BLANK
): void {
const usedBranch = this.getUsedBranch();
if (!this.test.included) {
const colonPos = findFirstOccurrenceOutsideComment(code.original, ':', this.consequent.end);
const inclusionStart = findNonWhiteSpace(
code.original,
(this.consequent.included
? findFirstOccurrenceOutsideComment(code.original, '?', this.test.end)
: colonPos) + 1
);
if (preventASI) {
removeLineBreaks(code, inclusionStart, usedBranch!.start);
}
code.remove(this.start, inclusionStart);
if (this.consequent.included) {
code.remove(colonPos, this.end);
}
removeAnnotations(this, code);
usedBranch!.render(code, options, {
isCalleeOfRenderedParent,
preventASI: true,
renderedParentType: renderedParentType || this.parent.type,
renderedSurroundingElement: renderedSurroundingElement || this.parent.type
});
} else {
this.test.render(code, options, { renderedSurroundingElement });
this.consequent.render(code, options);
this.alternate.render(code, options);
}
}
private getUsedBranch() {
if (this.isBranchResolutionAnalysed) {
return this.usedBranch;
}
this.isBranchResolutionAnalysed = true;
const testValue = this.test.getLiteralValueAtPath(EMPTY_PATH, SHARED_RECURSION_TRACKER, this);
return testValue === UnknownValue
? null
: (this.usedBranch = testValue ? this.consequent : this.alternate);
}
}