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Add clarifying comments.

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Cyrus Najmabadi 2014-11-25 01:12:21 -08:00
parent ce2e7fc5d5
commit dc6886c1ca
1 changed files with 9 additions and 11 deletions
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20
src/services/syntax/parser.ts
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@ -1371,6 +1371,7 @@ module TypeScript.Parser {
}
function parseFunctionDeclarationWorker(modifiers: ISyntaxToken[], functionKeyword: ISyntaxToken, asteriskToken: ISyntaxToken): FunctionDeclarationSyntax {
// FunctionDeclaration[Yield, Default] : // function BindingIdentifier[?Yield] ( FormalParameters ) { FunctionBody }
// GeneratorDeclaration[Yield, Default] :
// function * BindingIdentifier[?Yield](FormalParameters[Yield, GeneratorParameter]) { GeneratorBody[Yield] }
@ -3136,17 +3137,14 @@ module TypeScript.Parser {
var _currentToken = currentToken();
// Debug.assert(currentToken.kind === SyntaxKind.OpenParenToken || currentToken.kind === SyntaxKind.LessThanToken);
// Note: ES6 specifies the formal parametes of an arrow function like this:
//
// ArrowFormalParameters[Yield, GeneratorParameter] :
// (StrictFormalParameters[?Yield, ?GeneratorParameter])
//
// However, the 'GeneratorParameter' portion appears to be a spec bug. There does not
// appear to be any way for that value to be passed in through any grammar constructs.
//
// [Yield], on the other hand, is available, and is passed through.
var callSignature = parseCallSignature(/*requireCompleteTypeParameterList:*/ true, /*yield:*/ inYieldContext(), /*generatorParameter:*/ false);
// From the static semantic section:
// 1.If the [Yield] grammar parameter is present for CoverParenthesizedExpressionAndArrowParameterList[Yield]
// return the result of parsing the lexical token stream matched by CoverParenthesizedExpressionAndArrowParameterList[Yield]
// using ArrowFormalParameters[Yield, GeneratorParameter] as the goal symbol.
// 2.If the [Yield] grammar parameter is not present for CoverParenthesizedExpressionAndArrowParameterList[Yield]
// return the result of parsing the lexical token stream matched by CoverParenthesizedExpressionAndArrowParameterList
// using ArrowFormalParameters as the goal symbol.
var callSignature = parseCallSignature(/*requireCompleteTypeParameterList:*/ true, /*yield:*/ inYieldContext(), /*generatorParameter:*/ inYieldContext());
if (requireArrow && currentToken().kind !== SyntaxKind.EqualsGreaterThanToken) {
return undefined;