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Don't report errors directly when parsing throw statements or try/finally statements.

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This commit is contained in:
Cyrus Najmabadi
2014-12-01 00:45:18 -08:00
parent f91996a80c
commit 2f634b7e54
1 changed files with 35 additions and 18 deletions
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53
src/compiler/parser.ts
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@@ -3380,12 +3380,17 @@ module ts {
}
function parseThrowStatement(): ThrowStatement {
// ThrowStatement[Yield] :
// throw [no LineTerminator here]Expression[In, ?Yield];
// Because of automatic semicolon insertion, we need to report error if this
// throw could be terminated with a semicolon. Note: we can't call 'parseExpression'
// directly as that might consume an expression on the following line.
// We just return 'undefined' in that case. The actual error will be reported in the
// grammar walker.
var node = <ThrowStatement>createNode(SyntaxKind.ThrowStatement);
parseExpected(SyntaxKind.ThrowKeyword);
if (scanner.hasPrecedingLineBreak()) {
error(Diagnostics.Line_break_not_permitted_here);
}
node.expression = allowInAnd(parseExpression);
node.expression = scanner.hasPrecedingLineBreak() ? undefined : allowInAnd(parseExpression);
parseSemicolon();
return finishNode(node);
}
@@ -3393,25 +3398,20 @@ module ts {
// TODO: Review for error recovery
function parseTryStatement(): TryStatement {
var node = <TryStatement>createNode(SyntaxKind.TryStatement);
node.tryBlock = parseTokenAndBlock(SyntaxKind.TryKeyword, SyntaxKind.TryBlock);
if (token === SyntaxKind.CatchKeyword) {
node.catchBlock = parseCatchBlock();
}
node.tryBlock = parseTokenAndBlock(SyntaxKind.TryKeyword);
node.catchBlock = token === SyntaxKind.CatchKeyword ? parseCatchBlock() : undefined;
// If we don't have a catch clause, then we must have a finally clause. Try to parse
// one out no matter what.
if (!node.catchBlock || token === SyntaxKind.FinallyKeyword) {
node.finallyBlock = parseTokenAndBlock(SyntaxKind.FinallyKeyword, SyntaxKind.FinallyBlock);
}
node.finallyBlock = !node.catchBlock || token === SyntaxKind.FinallyKeyword ? parseTokenAndBlock(SyntaxKind.FinallyKeyword) : undefined;
return finishNode(node);
}
function parseTokenAndBlock(token: SyntaxKind, kind: SyntaxKind): Block {
function parseTokenAndBlock(token: SyntaxKind): Block {
var pos = getNodePos();
parseExpected(token);
var result = parseBlock(/* ignoreMissingOpenBrace */ false, /*checkForStrictMode*/ false);
result.kind = kind;
result.kind = token === SyntaxKind.TryKeyword ? SyntaxKind.TryBlock : SyntaxKind.FinallyBlock;
result.pos = pos;
return result;
}
@@ -4321,6 +4321,7 @@ module ts {
case SyntaxKind.ShorthandPropertyAssignment: return checkShorthandPropertyAssignment(<ShortHandPropertyDeclaration>node);
case SyntaxKind.SwitchStatement: return checkSwitchStatement(<SwitchStatement>node);
case SyntaxKind.TaggedTemplateExpression: return checkTaggedTemplateExpression(<TaggedTemplateExpression>node);
case SyntaxKind.ThrowStatement: return checkThrowStatement(<ThrowStatement>node);
case SyntaxKind.TupleType: return checkTupleType(<TupleTypeNode>node);
case SyntaxKind.TypeParameter: return checkTypeParameter(<TypeParameterDeclaration>node);
case SyntaxKind.TypeReference: return checkTypeReference(<TypeReferenceNode>node);
@@ -4331,12 +4332,22 @@ module ts {
}
}
function grammarErrorOnFirstToken(node: Node, message: DiagnosticMessage, arg0?: any, arg1?: any, arg2?: any): boolean {
var start = skipTrivia(sourceText, node.pos);
function scanToken(pos: number) {
var start = skipTrivia(sourceText, pos);
scanner.setTextPos(start);
scanner.scan();
var end = scanner.getTextPos();
grammarDiagnostics.push(createFileDiagnostic(file, start, end - start, message, arg0, arg1, arg2));
return start;
}
function grammarErrorOnFirstToken(node: Node, message: DiagnosticMessage, arg0?: any, arg1?: any, arg2?: any): boolean {
var start = scanToken(node.pos);
grammarDiagnostics.push(createFileDiagnostic(file, start, scanner.getTextPos() - start, message, arg0, arg1, arg2));
return true;
}
function grammarErrorAfterFirstToken(node: Node, message: DiagnosticMessage, arg0?: any, arg1?: any, arg2?: any): boolean {
scanToken(node.pos);
grammarDiagnostics.push(createFileDiagnostic(file, scanner.getTextPos(), 0, message, arg0, arg1, arg2));
return true;
}
@@ -5348,6 +5359,12 @@ module ts {
}
}
function checkThrowStatement(node: ThrowStatement) {
if (node.expression === undefined) {
return grammarErrorAfterFirstToken(node, Diagnostics.Line_break_not_permitted_here);
}
}
function checkTupleType(node: TupleTypeNode) {
return checkForDisallowedTrailingComma(node.elementTypes) ||
checkForAtLeastOneType(node);