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Fixes to session's handling of empty results #17728

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Merged
3 commits merged into from
Aug 14, 2017
Merged

Fixes to session's handling of empty results #17728

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753bd2d
Fixes to session's handling of empty results
Aug 10, 2017
f3a1a29
Fix emptyArray -> undefined
Aug 14, 2017
87a1a0b
Merge branch 'master' into session
Aug 14, 2017
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15 changes: 6 additions & 9 deletions src/server/session.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -626,7 +626,7 @@ namespace ts.server {

const definitions = project.getLanguageService().getTypeDefinitionAtPosition(file, position);
if (!definitions) {
return undefined;
return emptyArray;
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👍

}

return definitions.map(def => {
Expand Down Expand Up @@ -716,7 +716,7 @@ namespace ts.server {
const documentHighlights = project.getLanguageService().getDocumentHighlights(file, position, args.filesToSearch);

if (!documentHighlights) {
return undefined;
return emptyArray;
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👍

}

if (simplifiedResult) {
Expand Down Expand Up @@ -903,7 +903,7 @@ namespace ts.server {
}
}

private getReferences(args: protocol.FileLocationRequestArgs, simplifiedResult: boolean): protocol.ReferencesResponseBody | ReadonlyArray<ReferencedSymbol> {
private getReferences(args: protocol.FileLocationRequestArgs, simplifiedResult: boolean): protocol.ReferencesResponseBody | undefined | ReadonlyArray<ReferencedSymbol> {
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So we are okay with returning undefined on success?

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We don't really have a way to return a ReferencesResponseBody if the cursor wasn't at a valid location. It would be nice if we had some way to indicate a non-result in a way that's distinguishable from a crash in services.

const file = toNormalizedPath(args.file);
const projects = this.getProjects(args);

Expand All @@ -913,7 +913,7 @@ namespace ts.server {
if (simplifiedResult) {
const nameInfo = defaultProject.getLanguageService().getQuickInfoAtPosition(file, position);
if (!nameInfo) {
return emptyArray;
return undefined;
}

const displayString = displayPartsToString(nameInfo.displayParts);
Expand Down Expand Up @@ -1167,19 +1167,16 @@ namespace ts.server {
});
}

private getCompletions(args: protocol.CompletionsRequestArgs, simplifiedResult: boolean): ReadonlyArray<protocol.CompletionEntry> | CompletionInfo {
private getCompletions(args: protocol.CompletionsRequestArgs, simplifiedResult: boolean): ReadonlyArray<protocol.CompletionEntry> | CompletionInfo | undefined {
const prefix = args.prefix || "";
const { file, project } = this.getFileAndProject(args);

const scriptInfo = project.getScriptInfoForNormalizedPath(file);
const position = this.getPosition(args, scriptInfo);

const completions = project.getLanguageService().getCompletionsAtPosition(file, position);
if (!completions) {
return emptyArray;
}
if (simplifiedResult) {
return mapDefined(completions.entries, entry => {
return mapDefined(completions && completions.entries, entry => {
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I would have thought we'd want to return emptyArray when !completions.

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mapDefined always returns a defined result.

if (completions.isMemberCompletion || (entry.name.toLowerCase().indexOf(prefix.toLowerCase()) === 0)) {
const { name, kind, kindModifiers, sortText, replacementSpan } = entry;
const convertedSpan = replacementSpan ? this.decorateSpan(replacementSpan, scriptInfo) : undefined;
Expand Down