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Parsing of mapped types

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This commit is contained in:
Anders Hejlsberg
2016-11-03 06:09:44 -07:00
parent 7b34b612be
commit 7cd39e3818
5 changed files with 51 additions and 1 deletions
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src/compiler/parser.ts
+29 -1
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@@ -139,6 +139,10 @@ namespace ts {
case SyntaxKind.IndexedAccessType:
return visitNode(cbNode, (<IndexedAccessTypeNode>node).objectType) ||
visitNode(cbNode, (<IndexedAccessTypeNode>node).indexType);
case SyntaxKind.MappedType:
return visitNode(cbNode, (<MappedTypeNode>node).iterationTypeName) ||
visitNode(cbNode, (<MappedTypeNode>node).indexType) ||
visitNode(cbNode, (<MappedTypeNode>node).type);
case SyntaxKind.LiteralType:
return visitNode(cbNode, (<LiteralTypeNode>node).literal);
case SyntaxKind.ObjectBindingPattern:
@@ -2399,6 +2403,30 @@ namespace ts {
return members;
}
function isStartOfMappedType() {
nextToken();
if (token() === SyntaxKind.ReadonlyKeyword) {
nextToken();
}
return token() === SyntaxKind.OpenBracketToken && nextTokenIsIdentifier() && nextToken() === SyntaxKind.InKeyword;
}
function parseMappedType() {
const node = <MappedTypeNode>createNode(SyntaxKind.MappedType);
parseExpected(SyntaxKind.OpenBraceToken);
node.readonlyToken = parseOptionalToken(SyntaxKind.ReadonlyKeyword);
parseExpected(SyntaxKind.OpenBracketToken);
node.iterationTypeName = parseIdentifier();
parseExpected(SyntaxKind.InKeyword);
node.indexType = parseType();
parseExpected(SyntaxKind.CloseBracketToken);
node.questionToken = parseOptionalToken(SyntaxKind.QuestionToken);
node.type = parseTypeAnnotation();
parseSemicolon();
parseExpected(SyntaxKind.CloseBraceToken);
return finishNode(node);
}
function parseTupleType(): TupleTypeNode {
const node = <TupleTypeNode>createNode(SyntaxKind.TupleType);
node.elementTypes = parseBracketedList(ParsingContext.TupleElementTypes, parseType, SyntaxKind.OpenBracketToken, SyntaxKind.CloseBracketToken);
@@ -2472,7 +2500,7 @@ namespace ts {
case SyntaxKind.TypeOfKeyword:
return parseTypeQuery();
case SyntaxKind.OpenBraceToken:
return parseTypeLiteral();
return lookAhead(isStartOfMappedType) ? parseMappedType() : parseTypeLiteral();
case SyntaxKind.OpenBracketToken:
return parseTupleType();
case SyntaxKind.OpenParenToken: