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Change NodeArray to have a hasTrailingComma property instead of an OmittedExpression

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This commit is contained in:
Jason Freeman
2014-09-23 19:40:25 -07:00
parent ac88d8d274
commit de2ac51924
16 changed files with 62 additions and 41 deletions
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30
src/compiler/parser.ts
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@@ -1197,7 +1197,7 @@ module ts {
}
// Parses a comma-delimited list of elements
function parseDelimitedList<T extends Node>(kind: ParsingContext, parseElement: () => T, allowTrailingComma: boolean, preserveTrailingComma: boolean): NodeArray<T> {
function parseDelimitedList<T extends Node>(kind: ParsingContext, parseElement: () => T, allowTrailingComma: boolean): NodeArray<T> {
var saveParsingContext = parsingContext;
parsingContext |= 1 << kind;
var result = <NodeArray<T>>[];
@@ -1228,11 +1228,8 @@ module ts {
grammarErrorAtPos(commaStart, scanner.getStartPos() - commaStart, Diagnostics.Trailing_comma_not_allowed);
}
}
// Even if we reported an error because of a disallowed trailing comma, we still may
// need to preserve it for the checker so that signature help can work well.
if (preserveTrailingComma) {
result.push(<T>createNode(SyntaxKind.OmittedExpression));
}
// Always preserve a trailing comma by marking it on the NodeArray
result.hasTrailingComma = true;
}
break;
@@ -1267,7 +1264,7 @@ module ts {
function parseBracketedList<T extends Node>(kind: ParsingContext, parseElement: () => T, startToken: SyntaxKind, endToken: SyntaxKind): NodeArray<T> {
if (parseExpected(startToken)) {
var result = parseDelimitedList(kind, parseElement, /*allowTrailingComma*/ false, /*preserveTrailingComma*/ false);
var result = parseDelimitedList(kind, parseElement, /*allowTrailingComma*/ false);
parseExpected(endToken);
return result;
}
@@ -2307,7 +2304,7 @@ module ts {
// needs evidence of a trailing comma in order to give good results for signature help.
// That is why we do not allow a trailing comma, but we "preserve" a trailing comma.
callExpr.arguments = parseDelimitedList(ParsingContext.ArgumentExpressions,
parseArgumentExpression, /*allowTrailingComma*/ false, /*preserveTrailingComma*/ true);
parseArgumentExpression, /*allowTrailingComma*/ false);
parseExpected(SyntaxKind.CloseParenToken);
expr = finishNode(callExpr);
continue;
@@ -2402,7 +2399,7 @@ module ts {
parseExpected(SyntaxKind.OpenBracketToken);
if (scanner.hasPrecedingLineBreak()) node.flags |= NodeFlags.MultiLine;
node.elements = parseDelimitedList(ParsingContext.ArrayLiteralMembers,
parseArrayLiteralElement, /*allowTrailingComma*/ true, /*preserveTrailingComma*/ true);
parseArrayLiteralElement, /*allowTrailingComma*/ true);
parseExpected(SyntaxKind.CloseBracketToken);
return finishNode(node);
}
@@ -2444,10 +2441,7 @@ module ts {
node.flags |= NodeFlags.MultiLine;
}
// ES3 itself does not accept a trailing comma in an object literal, however, we'd like to preserve it in ES5.
var preserveTrailingComma = languageVersion !== ScriptTarget.ES3;
node.properties = parseDelimitedList(ParsingContext.ObjectLiteralMembers, parseObjectLiteralMember, /*allowTrailingComma*/ true, preserveTrailingComma);
node.properties = parseDelimitedList(ParsingContext.ObjectLiteralMembers, parseObjectLiteralMember, /*allowTrailingComma*/ true);
parseExpected(SyntaxKind.CloseBraceToken);
var seen: Map<SymbolFlags> = {};
@@ -2540,7 +2534,7 @@ module ts {
// needs evidence of a trailing comma in order to give good results for signature help.
// That is why we do not allow a trailing comma, but we "preserve" a trailing comma.
node.arguments = parseDelimitedList(ParsingContext.ArgumentExpressions,
parseArgumentExpression, /*allowTrailingComma*/ false, /*preserveTrailingComma*/ true);
parseArgumentExpression, /*allowTrailingComma*/ false);
parseExpected(SyntaxKind.CloseParenToken);
}
return finishNode(node);
@@ -3110,7 +3104,7 @@ module ts {
function parseVariableDeclarationList(flags: NodeFlags, noIn?: boolean): NodeArray<VariableDeclaration> {
return parseDelimitedList(ParsingContext.VariableDeclarations,
() => parseVariableDeclaration(flags, noIn), /*allowTrailingComma*/ false, /*preserveTrailingComma*/ false);
() => parseVariableDeclaration(flags, noIn), /*allowTrailingComma*/ false);
}
function parseVariableStatement(pos?: number, flags?: NodeFlags): VariableStatement {
@@ -3510,7 +3504,7 @@ module ts {
if (parseOptional(SyntaxKind.ImplementsKeyword)) {
implementsKeywordLength = scanner.getStartPos() - implementsKeywordStart;
node.implementedTypes = parseDelimitedList(ParsingContext.BaseTypeReferences,
parseTypeReference, /*allowTrailingComma*/ false, /*preserveTrailingComma*/ false);
parseTypeReference, /*allowTrailingComma*/ false);
}
var errorCountBeforeClassBody = file.syntacticErrors.length;
if (parseExpected(SyntaxKind.OpenBraceToken)) {
@@ -3539,7 +3533,7 @@ module ts {
if (parseOptional(SyntaxKind.ExtendsKeyword)) {
extendsKeywordLength = scanner.getStartPos() - extendsKeywordStart;
node.baseTypes = parseDelimitedList(ParsingContext.BaseTypeReferences,
parseTypeReference, /*allowTrailingComma*/ false, /*preserveTrailingComma*/ false);
parseTypeReference, /*allowTrailingComma*/ false);
}
var errorCountBeforeInterfaceBody = file.syntacticErrors.length;
node.members = parseTypeLiteral().members;
@@ -3604,7 +3598,7 @@ module ts {
node.name = parseIdentifier();
if (parseExpected(SyntaxKind.OpenBraceToken)) {
node.members = parseDelimitedList(ParsingContext.EnumMembers,
parseAndCheckEnumMember, /*allowTrailingComma*/ true, /*preserveTrailingComma*/ false);
parseAndCheckEnumMember, /*allowTrailingComma*/ true);
parseExpected(SyntaxKind.CloseBraceToken);
}
else {