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Rename SignatureFlags enum and improve its usage
As requested in the PR comments
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-36
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+38
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‎src/compiler/parser.ts

Lines changed: 38 additions & 36 deletions
Original file line numberDiff line numberDiff line change
@@ -2,11 +2,13 @@
22
/// <reference path="scanner.ts"/>
33

44
namespace ts {
5-
const enum SignatureContext {
5+
const enum SignatureFlags {
6+
None = 0,
67
Yield = 1 << 0,
78
Await = 1 << 1,
89
Type = 1 << 2,
910
RequireCompleteParameterList = 1 << 3,
11+
IgnoreMissingOpenBrace = 1 << 4,
1012
}
1113

1214
let NodeConstructor: new (kind: SyntaxKind, pos: number, end: number) => Node;
@@ -2225,10 +2227,10 @@ namespace ts {
22252227

22262228
function fillSignature(
22272229
returnToken: SyntaxKind.ColonToken | SyntaxKind.EqualsGreaterThanToken,
2228-
context: SignatureContext,
2230+
flags: SignatureFlags,
22292231
signature: SignatureDeclaration): void {
22302232
signature.typeParameters = parseTypeParameters();
2231-
signature.parameters = parseParameterList(context);
2233+
signature.parameters = parseParameterList(flags);
22322234

22332235
const returnTokenRequired = returnToken === SyntaxKind.EqualsGreaterThanToken;
22342236
if (returnTokenRequired) {
@@ -2238,7 +2240,7 @@ namespace ts {
22382240
else if (parseOptional(returnToken)) {
22392241
signature.type = parseTypeOrTypePredicate();
22402242
}
2241-
else if (context & SignatureContext.Type) {
2243+
else if (flags & SignatureFlags.Type) {
22422244
const start = scanner.getTokenPos();
22432245
const length = scanner.getTextPos() - start;
22442246
const backwardToken = parseOptional(returnToken === SyntaxKind.ColonToken ? SyntaxKind.EqualsGreaterThanToken : SyntaxKind.ColonToken);
@@ -2250,7 +2252,7 @@ namespace ts {
22502252
}
22512253
}
22522254

2253-
function parseParameterList(context: SignatureContext) {
2255+
function parseParameterList(flags: SignatureFlags) {
22542256
// FormalParameters [Yield,Await]: (modified)
22552257
// [empty]
22562258
// FormalParameterList[?Yield,Await]
@@ -2268,15 +2270,15 @@ namespace ts {
22682270
const savedYieldContext = inYieldContext();
22692271
const savedAwaitContext = inAwaitContext();
22702272

2271-
setYieldContext(!!(context & SignatureContext.Yield));
2272-
setAwaitContext(!!(context & SignatureContext.Await));
2273+
setYieldContext(!!(flags & SignatureFlags.Yield));
2274+
setAwaitContext(!!(flags & SignatureFlags.Await));
22732275

22742276
const result = parseDelimitedList(ParsingContext.Parameters, parseParameter);
22752277

22762278
setYieldContext(savedYieldContext);
22772279
setAwaitContext(savedAwaitContext);
22782280

2279-
if (!parseExpected(SyntaxKind.CloseParenToken) && (context & SignatureContext.RequireCompleteParameterList)) {
2281+
if (!parseExpected(SyntaxKind.CloseParenToken) && (flags & SignatureFlags.RequireCompleteParameterList)) {
22802282
// Caller insisted that we had to end with a ) We didn't. So just return
22812283
// undefined here.
22822284
return undefined;
@@ -2288,7 +2290,7 @@ namespace ts {
22882290
// We didn't even have an open paren. If the caller requires a complete parameter list,
22892291
// we definitely can't provide that. However, if they're ok with an incomplete one,
22902292
// then just return an empty set of parameters.
2291-
return (context & SignatureContext.RequireCompleteParameterList) ? undefined : createMissingList<ParameterDeclaration>();
2293+
return (flags & SignatureFlags.RequireCompleteParameterList) ? undefined : createMissingList<ParameterDeclaration>();
22922294
}
22932295

22942296
function parseTypeMemberSemicolon() {
@@ -2307,7 +2309,7 @@ namespace ts {
23072309
if (kind === SyntaxKind.ConstructSignature) {
23082310
parseExpected(SyntaxKind.NewKeyword);
23092311
}
2310-
fillSignature(SyntaxKind.ColonToken, SignatureContext.Type, node);
2312+
fillSignature(SyntaxKind.ColonToken, SignatureFlags.Type, node);
23112313
parseTypeMemberSemicolon();
23122314
return addJSDocComment(finishNode(node));
23132315
}
@@ -2397,7 +2399,7 @@ namespace ts {
23972399

23982400
// Method signatures don't exist in expression contexts. So they have neither
23992401
// [Yield] nor [Await]
2400-
fillSignature(SyntaxKind.ColonToken, SignatureContext.Type, method);
2402+
fillSignature(SyntaxKind.ColonToken, SignatureFlags.Type, method);
24012403
parseTypeMemberSemicolon();
24022404
return addJSDocComment(finishNode(method));
24032405
}
@@ -2541,7 +2543,7 @@ namespace ts {
25412543
if (kind === SyntaxKind.ConstructorType) {
25422544
parseExpected(SyntaxKind.NewKeyword);
25432545
}
2544-
fillSignature(SyntaxKind.EqualsGreaterThanToken, SignatureContext.Type, node);
2546+
fillSignature(SyntaxKind.EqualsGreaterThanToken, SignatureFlags.Type, node);
25452547
return finishNode(node);
25462548
}
25472549

@@ -3268,7 +3270,7 @@ namespace ts {
32683270
function parseParenthesizedArrowFunctionExpressionHead(allowAmbiguity: boolean): ArrowFunction {
32693271
const node = <ArrowFunction>createNode(SyntaxKind.ArrowFunction);
32703272
node.modifiers = parseModifiersForArrowFunction();
3271-
const isAsync = (getModifierFlags(node) & ModifierFlags.Async) ? SignatureContext.Await : 0;
3273+
const isAsync = (getModifierFlags(node) & ModifierFlags.Async) ? SignatureFlags.Await : SignatureFlags.None;
32723274

32733275
// Arrow functions are never generators.
32743276
//
@@ -3277,7 +3279,7 @@ namespace ts {
32773279
// a => (b => c)
32783280
// And think that "(b =>" was actually a parenthesized arrow function with a missing
32793281
// close paren.
3280-
fillSignature(SyntaxKind.ColonToken, isAsync | (allowAmbiguity ? 0 : SignatureContext.RequireCompleteParameterList), node);
3282+
fillSignature(SyntaxKind.ColonToken, isAsync | (allowAmbiguity ? SignatureFlags.None : SignatureFlags.RequireCompleteParameterList), node);
32813283

32823284
// If we couldn't get parameters, we definitely could not parse out an arrow function.
32833285
if (!node.parameters) {
@@ -3302,7 +3304,7 @@ namespace ts {
33023304

33033305
function parseArrowFunctionExpressionBody(isAsync: boolean): Block | Expression {
33043306
if (token() === SyntaxKind.OpenBraceToken) {
3305-
return parseFunctionBlock(/*allowYield*/ false, /*allowAwait*/ isAsync, /*ignoreMissingOpenBrace*/ false);
3307+
return parseFunctionBlock(isAsync ? SignatureFlags.Await : SignatureFlags.None);
33063308
}
33073309

33083310
if (token() !== SyntaxKind.SemicolonToken &&
@@ -3323,8 +3325,8 @@ namespace ts {
33233325
// try to recover better. If we don't do this, then the next close curly we see may end
33243326
// up preemptively closing the containing construct.
33253327
//
3326-
// Note: even when 'ignoreMissingOpenBrace' is passed as true, parseBody will still error.
3327-
return parseFunctionBlock(/*allowYield*/ false, /*allowAwait*/ isAsync, /*ignoreMissingOpenBrace*/ true);
3328+
// Note: even when 'IgnoreMissingOpenBrace' is passed, parseBody will still error.
3329+
return parseFunctionBlock(SignatureFlags.IgnoreMissingOpenBrace | (isAsync ? SignatureFlags.Await : SignatureFlags.None));
33283330
}
33293331

33303332
return isAsync
@@ -4400,16 +4402,16 @@ namespace ts {
44004402
parseExpected(SyntaxKind.FunctionKeyword);
44014403
node.asteriskToken = parseOptionalToken(SyntaxKind.AsteriskToken);
44024404

4403-
const isGenerator = node.asteriskToken ? SignatureContext.Yield : 0;
4404-
const isAsync = (getModifierFlags(node) & ModifierFlags.Async) ? SignatureContext.Await : 0;
4405+
const isGenerator = node.asteriskToken ? SignatureFlags.Yield : SignatureFlags.None;
4406+
const isAsync = (getModifierFlags(node) & ModifierFlags.Async) ? SignatureFlags.Await : SignatureFlags.None;
44054407
node.name =
44064408
isGenerator && isAsync ? doInYieldAndAwaitContext(parseOptionalIdentifier) :
44074409
isGenerator ? doInYieldContext(parseOptionalIdentifier) :
44084410
isAsync ? doInAwaitContext(parseOptionalIdentifier) :
44094411
parseOptionalIdentifier();
44104412

44114413
fillSignature(SyntaxKind.ColonToken, isGenerator | isAsync, node);
4412-
node.body = parseFunctionBlock(/*allowYield*/ !!isGenerator, /*allowAwait*/ !!isAsync, /*ignoreMissingOpenBrace*/ false);
4414+
node.body = parseFunctionBlock(isGenerator | isAsync);
44134415

44144416
if (saveDecoratorContext) {
44154417
setDecoratorContext(/*val*/ true);
@@ -4458,12 +4460,12 @@ namespace ts {
44584460
return finishNode(node);
44594461
}
44604462

4461-
function parseFunctionBlock(allowYield: boolean, allowAwait: boolean, ignoreMissingOpenBrace: boolean, diagnosticMessage?: DiagnosticMessage): Block {
4463+
function parseFunctionBlock(flags: SignatureFlags, diagnosticMessage?: DiagnosticMessage): Block {
44624464
const savedYieldContext = inYieldContext();
4463-
setYieldContext(allowYield);
4465+
setYieldContext(!!(flags & SignatureFlags.Yield));
44644466

44654467
const savedAwaitContext = inAwaitContext();
4466-
setAwaitContext(allowAwait);
4468+
setAwaitContext(!!(flags & SignatureFlags.Await));
44674469

44684470
// We may be in a [Decorator] context when parsing a function expression or
44694471
// arrow function. The body of the function is not in [Decorator] context.
@@ -4472,7 +4474,7 @@ namespace ts {
44724474
setDecoratorContext(/*val*/ false);
44734475
}
44744476

4475-
const block = parseBlock(ignoreMissingOpenBrace, diagnosticMessage);
4477+
const block = parseBlock(!!(flags & SignatureFlags.IgnoreMissingOpenBrace), diagnosticMessage);
44764478

44774479
if (saveDecoratorContext) {
44784480
setDecoratorContext(/*val*/ true);
@@ -5019,13 +5021,13 @@ namespace ts {
50195021
return !scanner.hasPrecedingLineBreak() && (isIdentifier() || token() === SyntaxKind.StringLiteral);
50205022
}
50215023

5022-
function parseFunctionBlockOrSemicolon(isGenerator: boolean, isAsync: boolean, diagnosticMessage?: DiagnosticMessage): Block {
5024+
function parseFunctionBlockOrSemicolon(flags: SignatureFlags, diagnosticMessage?: DiagnosticMessage): Block {
50235025
if (token() !== SyntaxKind.OpenBraceToken && canParseSemicolon()) {
50245026
parseSemicolon();
50255027
return;
50265028
}
50275029

5028-
return parseFunctionBlock(isGenerator, isAsync, /*ignoreMissingOpenBrace*/ false, diagnosticMessage);
5030+
return parseFunctionBlock(flags, diagnosticMessage);
50295031
}
50305032

50315033
// DECLARATIONS
@@ -5160,10 +5162,10 @@ namespace ts {
51605162
parseExpected(SyntaxKind.FunctionKeyword);
51615163
node.asteriskToken = parseOptionalToken(SyntaxKind.AsteriskToken);
51625164
node.name = hasModifier(node, ModifierFlags.Default) ? parseOptionalIdentifier() : parseIdentifier();
5163-
const isGenerator = node.asteriskToken ? SignatureContext.Yield : 0;
5164-
const isAsync = hasModifier(node, ModifierFlags.Async) ? SignatureContext.Await : 0;
5165+
const isGenerator = node.asteriskToken ? SignatureFlags.Yield : SignatureFlags.None;
5166+
const isAsync = hasModifier(node, ModifierFlags.Async) ? SignatureFlags.Await : SignatureFlags.None;
51655167
fillSignature(SyntaxKind.ColonToken, isGenerator | isAsync, node);
5166-
node.body = parseFunctionBlockOrSemicolon(!!isGenerator, !!isAsync, Diagnostics.or_expected);
5168+
node.body = parseFunctionBlockOrSemicolon(isGenerator | isAsync, Diagnostics.or_expected);
51675169
return addJSDocComment(finishNode(node));
51685170
}
51695171

@@ -5172,8 +5174,8 @@ namespace ts {
51725174
node.decorators = decorators;
51735175
node.modifiers = modifiers;
51745176
parseExpected(SyntaxKind.ConstructorKeyword);
5175-
fillSignature(SyntaxKind.ColonToken, /*context*/ 0, node);
5176-
node.body = parseFunctionBlockOrSemicolon(/*isGenerator*/ false, /*isAsync*/ false, Diagnostics.or_expected);
5177+
fillSignature(SyntaxKind.ColonToken, SignatureFlags.None, node);
5178+
node.body = parseFunctionBlockOrSemicolon(SignatureFlags.None, Diagnostics.or_expected);
51775179
return addJSDocComment(finishNode(node));
51785180
}
51795181

@@ -5184,10 +5186,10 @@ namespace ts {
51845186
method.asteriskToken = asteriskToken;
51855187
method.name = name;
51865188
method.questionToken = questionToken;
5187-
const isGenerator = asteriskToken ? SignatureContext.Yield : 0;
5188-
const isAsync = hasModifier(method, ModifierFlags.Async) ? SignatureContext.Await : 0;
5189+
const isGenerator = asteriskToken ? SignatureFlags.Yield : SignatureFlags.None;
5190+
const isAsync = hasModifier(method, ModifierFlags.Async) ? SignatureFlags.Await : SignatureFlags.None;
51895191
fillSignature(SyntaxKind.ColonToken, isGenerator | isAsync, method);
5190-
method.body = parseFunctionBlockOrSemicolon(!!isGenerator, !!isAsync, diagnosticMessage);
5192+
method.body = parseFunctionBlockOrSemicolon(isGenerator | isAsync, diagnosticMessage);
51915193
return addJSDocComment(finishNode(method));
51925194
}
51935195

@@ -5240,8 +5242,8 @@ namespace ts {
52405242
node.decorators = decorators;
52415243
node.modifiers = modifiers;
52425244
node.name = parsePropertyName();
5243-
fillSignature(SyntaxKind.ColonToken, /*context*/ 0, node);
5244-
node.body = parseFunctionBlockOrSemicolon(/*isGenerator*/ false, /*isAsync*/ false);
5245+
fillSignature(SyntaxKind.ColonToken, SignatureFlags.None, node);
5246+
node.body = parseFunctionBlockOrSemicolon(SignatureFlags.None);
52455247
return addJSDocComment(finishNode(node));
52465248
}
52475249

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