/
signature.ts
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/
signature.ts
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import * as ts from "typescript";
import * as assert from "assert";
import {
DeclarationReflection,
IntrinsicType,
ParameterReflection,
PredicateType,
Reflection,
ReflectionFlag,
ReflectionKind,
SignatureReflection,
TypeParameterReflection,
VarianceModifier,
} from "../../models";
import type { Context } from "../context";
import { ConverterEvents } from "../converter-events";
import { convertDefaultValue } from "../convert-expression";
import { removeUndefined } from "../utils/reflections";
import { getComment, getJsDocComment, getSignatureComment } from "../comments";
export function createSignature(
context: Context,
kind:
| ReflectionKind.CallSignature
| ReflectionKind.ConstructorSignature
| ReflectionKind.GetSignature
| ReflectionKind.SetSignature,
signature: ts.Signature,
declaration?: ts.SignatureDeclaration | ts.JSDocSignature
) {
assert(context.scope instanceof DeclarationReflection);
declaration ||= signature.getDeclaration() as
| ts.SignatureDeclaration
| undefined;
const sigRef = new SignatureReflection(
kind == ReflectionKind.ConstructorSignature
? `new ${context.scope.parent!.name}`
: context.scope.name,
kind,
context.scope
);
if (declaration) {
sigRef.comment = getSignatureComment(
declaration,
context.converter.config,
context.logger,
context.converter.commentStyle
);
}
sigRef.typeParameters = convertTypeParameters(
context,
sigRef,
signature.typeParameters
);
const parameterSymbols: ReadonlyArray<ts.Symbol & { type?: ts.Type }> =
signature.thisParameter
? [signature.thisParameter, ...signature.parameters]
: signature.parameters;
sigRef.parameters = convertParameters(
context,
sigRef,
parameterSymbols,
declaration?.parameters
);
const predicate = context.checker.getTypePredicateOfSignature(signature);
if (predicate) {
sigRef.type = convertPredicate(predicate, context.withScope(sigRef));
} else if (kind == ReflectionKind.SetSignature) {
sigRef.type = new IntrinsicType("void");
} else {
sigRef.type = context.converter.convertType(
context.withScope(sigRef),
(declaration?.kind === ts.SyntaxKind.FunctionDeclaration &&
declaration.type) ||
signature.getReturnType()
);
}
context.registerReflection(sigRef, undefined);
switch (kind) {
case ReflectionKind.GetSignature:
context.scope.getSignature = sigRef;
break;
case ReflectionKind.SetSignature:
context.scope.setSignature = sigRef;
break;
case ReflectionKind.CallSignature:
case ReflectionKind.ConstructorSignature:
context.scope.signatures ??= [];
context.scope.signatures.push(sigRef);
break;
}
context.trigger(ConverterEvents.CREATE_SIGNATURE, sigRef, declaration);
}
function convertParameters(
context: Context,
sigRef: SignatureReflection,
parameters: readonly (ts.Symbol & { type?: ts.Type })[],
parameterNodes:
| readonly ts.ParameterDeclaration[]
| readonly ts.JSDocParameterTag[]
| undefined
) {
return parameters.map((param, i) => {
const declaration = param.valueDeclaration as
| ts.Declaration
| undefined;
assert(
!declaration ||
ts.isParameter(declaration) ||
ts.isJSDocParameterTag(declaration)
);
const paramRefl = new ParameterReflection(
/__\d+/.test(param.name) ? "__namedParameters" : param.name,
ReflectionKind.Parameter,
sigRef
);
if (declaration && ts.isJSDocParameterTag(declaration)) {
paramRefl.comment = getJsDocComment(
declaration,
context.converter.config,
context.logger
);
}
paramRefl.comment ||= getComment(
param,
paramRefl.kind,
context.converter.config,
context.logger,
context.converter.commentStyle
);
context.registerReflection(paramRefl, param);
context.trigger(ConverterEvents.CREATE_PARAMETER, paramRefl);
let type: ts.Type | ts.TypeNode | undefined;
if (declaration) {
type = context.checker.getTypeOfSymbolAtLocation(
param,
declaration
);
} else {
type = param.type;
}
paramRefl.type = context.converter.convertType(
context.withScope(paramRefl),
type
);
let isOptional = false;
if (declaration) {
isOptional = ts.isParameter(declaration)
? !!declaration.questionToken ||
ts
.getJSDocParameterTags(declaration)
.some((tag) => tag.isBracketed)
: declaration.isBracketed;
}
if (isOptional) {
paramRefl.type = removeUndefined(paramRefl.type);
}
paramRefl.defaultValue = convertDefaultValue(parameterNodes?.[i]);
paramRefl.setFlag(ReflectionFlag.Optional, isOptional);
// If we have no declaration, then this is an implicitly defined parameter in JS land
// because the method body uses `arguments`... which is always a rest argument
let isRest = true;
if (declaration) {
isRest = ts.isParameter(declaration)
? !!declaration.dotDotDotToken
: !!declaration.typeExpression &&
ts.isJSDocVariadicType(declaration.typeExpression.type);
}
paramRefl.setFlag(ReflectionFlag.Rest, isRest);
return paramRefl;
});
}
export function convertParameterNodes(
context: Context,
sigRef: SignatureReflection,
parameters: readonly (ts.JSDocParameterTag | ts.ParameterDeclaration)[]
) {
return parameters.map((param) => {
const paramRefl = new ParameterReflection(
/__\d+/.test(param.name.getText())
? "__namedParameters"
: param.name.getText(),
ReflectionKind.Parameter,
sigRef
);
if (ts.isJSDocParameterTag(param)) {
paramRefl.comment = getJsDocComment(
param,
context.converter.config,
context.logger
);
}
context.registerReflection(
paramRefl,
context.getSymbolAtLocation(param)
);
context.trigger(ConverterEvents.CREATE_PARAMETER, paramRefl);
paramRefl.type = context.converter.convertType(
context.withScope(paramRefl),
ts.isParameter(param) ? param.type : param.typeExpression?.type
);
const isOptional = ts.isParameter(param)
? !!param.questionToken
: param.isBracketed;
if (isOptional) {
paramRefl.type = removeUndefined(paramRefl.type);
}
paramRefl.defaultValue = convertDefaultValue(param);
paramRefl.setFlag(ReflectionFlag.Optional, isOptional);
paramRefl.setFlag(
ReflectionFlag.Rest,
ts.isParameter(param)
? !!param.dotDotDotToken
: !!param.typeExpression &&
ts.isJSDocVariadicType(param.typeExpression.type)
);
return paramRefl;
});
}
function convertTypeParameters(
context: Context,
parent: Reflection,
parameters: readonly ts.TypeParameter[] | undefined
) {
return parameters?.map((param) => {
const constraintT = param.getConstraint();
const defaultT = param.getDefault();
const constraint = constraintT
? context.converter.convertType(context, constraintT)
: void 0;
const defaultType = defaultT
? context.converter.convertType(context, defaultT)
: void 0;
// There's no way to determine directly from a ts.TypeParameter what it's variance modifiers are
// so unfortunately we have to go back to the node for this...
const variance = getVariance(
param.getSymbol()?.declarations?.find(ts.isTypeParameterDeclaration)
?.modifiers
);
const paramRefl = new TypeParameterReflection(
param.symbol.name,
constraint,
defaultType,
parent,
variance
);
context.registerReflection(paramRefl, param.getSymbol());
context.trigger(ConverterEvents.CREATE_TYPE_PARAMETER, paramRefl);
return paramRefl;
});
}
export function convertTypeParameterNodes(
context: Context,
parameters: readonly ts.TypeParameterDeclaration[] | undefined
) {
return parameters?.map((param) =>
createTypeParamReflection(param, context)
);
}
export function createTypeParamReflection(
param: ts.TypeParameterDeclaration,
context: Context
) {
const constraint = param.constraint
? context.converter.convertType(context, param.constraint)
: void 0;
const defaultType = param.default
? context.converter.convertType(context, param.default)
: void 0;
const paramRefl = new TypeParameterReflection(
param.name.text,
constraint,
defaultType,
context.scope,
getVariance(param.modifiers)
);
context.registerReflection(paramRefl, param.symbol);
if (ts.isJSDocTemplateTag(param.parent)) {
paramRefl.comment = getJsDocComment(
param.parent,
context.converter.config,
context.logger
);
}
context.trigger(ConverterEvents.CREATE_TYPE_PARAMETER, paramRefl, param);
return paramRefl;
}
function getVariance(
modifiers: ts.ModifiersArray | undefined
): VarianceModifier | undefined {
const hasIn = modifiers?.some(
(mod) => mod.kind === ts.SyntaxKind.InKeyword
);
const hasOut = modifiers?.some(
(mod) => mod.kind === ts.SyntaxKind.OutKeyword
);
if (hasIn && hasOut) {
return VarianceModifier.inOut;
}
if (hasIn) {
return VarianceModifier.in;
}
if (hasOut) {
return VarianceModifier.out;
}
}
function convertPredicate(
predicate: ts.TypePredicate,
context: Context
): PredicateType {
let name: string;
switch (predicate.kind) {
case ts.TypePredicateKind.This:
case ts.TypePredicateKind.AssertsThis:
name = "this";
break;
case ts.TypePredicateKind.Identifier:
case ts.TypePredicateKind.AssertsIdentifier:
name = predicate.parameterName;
break;
}
let asserts: boolean;
switch (predicate.kind) {
case ts.TypePredicateKind.This:
case ts.TypePredicateKind.Identifier:
asserts = false;
break;
case ts.TypePredicateKind.AssertsThis:
case ts.TypePredicateKind.AssertsIdentifier:
asserts = true;
break;
}
return new PredicateType(
name,
asserts,
predicate.type
? context.converter.convertType(context, predicate.type)
: void 0
);
}