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Make classification cancellable.

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This commit is contained in:
Cyrus Najmabadi 2015-06-18 08:56:48 -07:00
parent 6db4faf488
commit 958a423142
1 changed files with 26 additions and 1 deletions
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27
src/services/services.ts
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@ -5986,6 +5986,26 @@ namespace ts {
return convertClassifications(getEncodedSemanticClassifications(fileName, span));
}
function checkForClassificationCancellation(kind: SyntaxKind) {
// We don't want to actually call back into our host on every node to find out if we've
// been canceled. That would be an enormous amount of chattyness, along with the all
// the overhead of marshalling the data to/from the host. So instead we pick a few
// reasonable node kinds to bother checking on. These node kinds represent high level
// constructs that we would expect to see commonly, but just at a far less frequent
// interval.
//
// For example, in checker.ts (around 750k) we only have around 600 of these constructs.
// That means we're calling back into the host around every 1.2k of the file we process.
// Lib.d.ts has similar numbers.
switch (kind) {
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.ClassDeclaration:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.FunctionDeclaration:
cancellationToken.throwIfCancellationRequested();
}
}
function getEncodedSemanticClassifications(fileName: string, span: TextSpan): Classifications {
synchronizeHostData();
@ -6053,7 +6073,10 @@ namespace ts {
function processNode(node: Node) {
// Only walk into nodes that intersect the requested span.
if (node && textSpanIntersectsWith(span, node.getFullStart(), node.getFullWidth())) {
if (node.kind === SyntaxKind.Identifier && !nodeIsMissing(node)) {
let kind = node.kind;
checkForClassificationCancellation(kind);
if (kind === SyntaxKind.Identifier && !nodeIsMissing(node)) {
let identifier = <Identifier>node;
// Only bother calling into the typechecker if this is an identifier that
@ -6405,6 +6428,8 @@ namespace ts {
// Ignore nodes that don't intersect the original span to classify.
if (textSpanIntersectsWith(span, element.getFullStart(), element.getFullWidth())) {
checkForClassificationCancellation(element.kind);
let children = element.getChildren(sourceFile);
for (let child of children) {
if (isToken(child)) {