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feat: info if elvis operator is unnecessary (#645)
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Closes partially #543

### Summary of Changes

Show an info if an elvis operator can be removed.

---------

Co-authored-by: megalinter-bot <129584137+megalinter-bot@users.noreply.github.com>
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@lars-reimann @megalinter-bot
lars-reimann and megalinter-bot authored Oct 17, 2023
1 parent 9af3b81 commit dcc05ce
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Showing 7 changed files with 186 additions and 83 deletions.
8 changes: 4 additions & 4 deletions src/language/builtins/safe-ds-annotations.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ import { URI } from 'langium';
import { SafeDsServices } from '../safe-ds-module.js';
import { SafeDsNodeMapper } from '../helpers/safe-ds-node-mapper.js';
import { toConstantExpressionOrUndefined } from '../partialEvaluation/toConstantExpressionOrUndefined.js';
import { SdsConstantExpression, SdsConstantString } from '../partialEvaluation/model.js';
import { ConstantExpression, ConstantString } from '../partialEvaluation/model.js';

const ANNOTATION_USAGE_URI = resourceNameToUri('builtins/safeds/lang/annotationUsage.sdsstub');
const CODE_GENERATION_URI = resourceNameToUri('builtins/safeds/lang/codeGeneration.sdsstub');
Expand Down Expand Up @@ -48,7 +48,7 @@ export class SafeDsAnnotations extends SafeDsModuleMembers<SdsAnnotation> {

getPythonModule(node: SdsModule | undefined): string | undefined {
const value = this.getArgumentValue(node, this.PythonModule, 'qualifiedName');
if (value instanceof SdsConstantString) {
if (value instanceof ConstantString) {
return value.value;
} else {
return undefined;
Expand All @@ -61,7 +61,7 @@ export class SafeDsAnnotations extends SafeDsModuleMembers<SdsAnnotation> {

getPythonName(node: SdsAnnotatedObject | undefined): string | undefined {
const value = this.getArgumentValue(node, this.PythonName, 'name');
if (value instanceof SdsConstantString) {
if (value instanceof ConstantString) {
return value.value;
} else {
return undefined;
Expand Down Expand Up @@ -92,7 +92,7 @@ export class SafeDsAnnotations extends SafeDsModuleMembers<SdsAnnotation> {
node: SdsAnnotatedObject | undefined,
annotation: SdsAnnotation | undefined,
parameterName: string,
): SdsConstantExpression | undefined {
): ConstantExpression | undefined {
const annotationCall = findFirstAnnotationCallOf(node, annotation);
const expression = argumentsOrEmpty(annotationCall).find(
(it) => this.nodeMapper.argumentToParameterOrUndefined(it)?.name === parameterName,
Expand Down
76 changes: 39 additions & 37 deletions src/language/partialEvaluation/model.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -10,23 +10,23 @@ import {
} from '../generated/ast.js';

/* c8 ignore start */
export type ParameterSubstitutions = Map<SdsParameter, SdsSimplifiedExpression | undefined>;
export type ResultSubstitutions = Map<SdsAbstractResult, SdsSimplifiedExpression | undefined>;
export type ParameterSubstitutions = Map<SdsParameter, SimplifiedExpression | undefined>;
export type ResultSubstitutions = Map<SdsAbstractResult, SimplifiedExpression | undefined>;

export abstract class SdsSimplifiedExpression {
export abstract class SimplifiedExpression {
/**
* Removes any unnecessary containers from the expression.
*/
unwrap(): SdsSimplifiedExpression {
unwrap(): SimplifiedExpression {
return this;
}
}

export abstract class SdsIntermediateExpression extends SdsSimplifiedExpression {}
export abstract class IntermediateExpression extends SimplifiedExpression {}

export abstract class SdsIntermediateCallable extends SdsIntermediateExpression {}
export abstract class IntermediateCallable extends IntermediateExpression {}

export class SdsIntermediateBlockLambda extends SdsIntermediateCallable {
export class IntermediateBlockLambda extends IntermediateCallable {
constructor(
readonly parameters: SdsParameter[],
readonly results: SdsBlockLambdaResult[],
Expand All @@ -36,7 +36,7 @@ export class SdsIntermediateBlockLambda extends SdsIntermediateCallable {
}
}

export class SdsIntermediateExpressionLambda extends SdsIntermediateCallable {
export class IntermediateExpressionLambda extends IntermediateCallable {
constructor(
readonly parameters: SdsParameter[],
readonly result: SdsExpression,
Expand All @@ -46,7 +46,7 @@ export class SdsIntermediateExpressionLambda extends SdsIntermediateCallable {
}
}

export class SdsIntermediateStep extends SdsIntermediateCallable {
export class IntermediateStep extends IntermediateCallable {
constructor(
readonly parameters: SdsParameter[],
readonly results: SdsResult[],
Expand All @@ -55,12 +55,12 @@ export class SdsIntermediateStep extends SdsIntermediateCallable {
}
}

export class SdsIntermediateRecord extends SdsIntermediateExpression {
export class IntermediateRecord extends IntermediateExpression {
constructor(readonly resultSubstitutions: ResultSubstitutions) {
super();
}

getSubstitutionByReferenceOrNull(reference: SdsReference): SdsSimplifiedExpression | null {
getSubstitutionByReferenceOrNull(reference: SdsReference): SimplifiedExpression | null {
const referencedDeclaration = reference.target;
if (!isSdsAbstractResult(referencedDeclaration)) {
return null;
Expand All @@ -69,7 +69,7 @@ export class SdsIntermediateRecord extends SdsIntermediateExpression {
return this.resultSubstitutions.get(referencedDeclaration) ?? null;
}

getSubstitutionByIndexOrNull(index: number | null): SdsSimplifiedExpression | null {
getSubstitutionByIndexOrNull(index: number | null): SimplifiedExpression | null {
if (index === null) {
return null;
}
Expand All @@ -79,7 +79,7 @@ export class SdsIntermediateRecord extends SdsIntermediateExpression {
/**
* If the record contains exactly one substitution its value is returned. Otherwise, it returns `this`.
*/
override unwrap(): SdsSimplifiedExpression {
override unwrap(): SimplifiedExpression {
if (this.resultSubstitutions.size === 1) {
return this.resultSubstitutions.values().next().value;
} else {
Expand All @@ -95,21 +95,21 @@ export class SdsIntermediateRecord extends SdsIntermediateExpression {
}
}

export class SdsIntermediateVariadicArguments extends SdsIntermediateExpression {
constructor(readonly arguments_: (SdsSimplifiedExpression | null)[]) {
export class IntermediateVariadicArguments extends IntermediateExpression {
constructor(readonly arguments_: (SimplifiedExpression | null)[]) {
super();
}

getArgumentByIndexOrNull(index: number | null): SdsSimplifiedExpression | null {
getArgumentByIndexOrNull(index: number | null): SimplifiedExpression | null {
if (index === null) {
return null;
}
return this.arguments_[index] ?? null;
}
}

export abstract class SdsConstantExpression extends SdsSimplifiedExpression {
abstract equals(other: SdsConstantExpression): boolean;
export abstract class ConstantExpression extends SimplifiedExpression {
abstract equals(other: ConstantExpression): boolean;

abstract override toString(): string;

Expand All @@ -121,81 +121,83 @@ export abstract class SdsConstantExpression extends SdsSimplifiedExpression {
}
}

export class SdsConstantBoolean extends SdsConstantExpression {
export class ConstantBoolean extends ConstantExpression {
constructor(readonly value: boolean) {
super();
}

equals(other: SdsConstantExpression): boolean {
return other instanceof SdsConstantBoolean && this.value === other.value;
equals(other: ConstantExpression): boolean {
return other instanceof ConstantBoolean && this.value === other.value;
}

toString(): string {
return this.value.toString();
}
}

export class SdsConstantEnumVariant extends SdsConstantExpression {
export class ConstantEnumVariant extends ConstantExpression {
constructor(readonly value: SdsEnumVariant) {
super();
}

equals(other: SdsConstantExpression): boolean {
return other instanceof SdsConstantEnumVariant && this.value === other.value;
equals(other: ConstantExpression): boolean {
return other instanceof ConstantEnumVariant && this.value === other.value;
}

toString(): string {
return this.value.name;
}
}

export abstract class SdsConstantNumber extends SdsConstantExpression {}
export abstract class ConstantNumber extends ConstantExpression {}

export class SdsConstantFloat extends SdsConstantNumber {
export class ConstantFloat extends ConstantNumber {
constructor(readonly value: number) {
super();
}

equals(other: SdsConstantExpression): boolean {
return other instanceof SdsConstantFloat && this.value === other.value;
equals(other: ConstantExpression): boolean {
return other instanceof ConstantFloat && this.value === other.value;
}

toString(): string {
return this.value.toString();
}
}

export class SdsConstantInt extends SdsConstantNumber {
export class ConstantInt extends ConstantNumber {
constructor(readonly value: bigint) {
super();
}

equals(other: SdsConstantExpression): boolean {
return other instanceof SdsConstantInt && this.value === other.value;
equals(other: ConstantExpression): boolean {
return other instanceof ConstantInt && this.value === other.value;
}

toString(): string {
return this.value.toString();
}
}

export class SdsConstantNull extends SdsConstantExpression {
equals(other: SdsConstantExpression): boolean {
return other instanceof SdsConstantNull;
class ConstantNullClass extends ConstantExpression {
equals(other: ConstantExpression): boolean {
return other instanceof ConstantNullClass;
}

toString(): string {
return 'null';
}
}

export class SdsConstantString extends SdsConstantExpression {
export const ConstantNull = new ConstantNullClass();

export class ConstantString extends ConstantExpression {
constructor(readonly value: string) {
super();
}

equals(other: SdsConstantExpression): boolean {
return other instanceof SdsConstantString && this.value === other.value;
equals(other: ConstantExpression): boolean {
return other instanceof ConstantString && this.value === other.value;
}

toString(): string {
Expand Down
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