Integrated pull request feedback

src/server/client.ts

@@ -428,7 +428,35 @@ module ts.server {
         }
 
         getSignatureHelpItems(fileName: string, position: number): SignatureHelpItems {
-            throw new Error("Not Implemented Yet.");
+            var lineOffset = this.positionToOneBasedLineOffset(fileName, position);
+            var args: protocol.SignatureHelpRequestArgs = {
+                file: fileName,
+                line: lineOffset.line,
+                offset: lineOffset.offset
+            };
+            
+            var request = this.processRequest<protocol.SignatureHelpRequest>(CommandNames.SignatureHelp, args);
+            var response = this.processResponse<protocol.SignatureHelpResponse>(request);
+            
+            if (!response.body) {
+                return undefined;
+            }
+            var helpItems: protocol.SignatureHelpItems = response.body;
+            var span = helpItems.applicableSpan;
+            var start = this.lineOffsetToPosition(fileName, span.start);
+            var end = this.lineOffsetToPosition(fileName, span.end);
+            
+            var result: SignatureHelpItems = {
+                items: helpItems.items,
+                applicableSpan: {
+                    start: start,
+                    length: end - start
+                },
+                selectedItemIndex: helpItems.selectedItemIndex,
+                argumentIndex: helpItems.argumentIndex,
+                argumentCount: helpItems.argumentCount,                
+            }
+            return result;
         }
 
         getOccurrencesAtPosition(fileName: string, position: number): ReferenceEntry[] {

src/server/protocol.d.ts

@@ -644,7 +644,7 @@ declare module ts.server.protocol {
         separatorDisplayParts: SymbolDisplayPart[];
         
         /**
-         * The signatiure helps items for the parameters. 
+         * The signature helps items for the parameters. 
          */        
         parameters: SignatureHelpParameter[];
                 
@@ -655,17 +655,17 @@ declare module ts.server.protocol {
     }
     
     /**
-     * Signation help items found in the response of a signature help request.
+     * Signature help items found in the response of a signature help request.
      */
     export interface SignatureHelpItems {
       
         /**
-         * The signaure help items.    
+         * The signature help items.    
          */        
         items: SignatureHelpItem[];
                 
         /**
-         * @steveluc
+         * The span for which signature help should appear on a signature 
          */        
         applicableSpan: TextSpan;
                 
@@ -680,7 +680,7 @@ declare module ts.server.protocol {
         argumentIndex: number;
         
         /**
-         * The argument counts
+         * The argument count
          */        
         argumentCount: number;
     }

src/server/session.ts

@@ -593,7 +593,7 @@ module ts.server {
             }
             
             var span = helpItems.applicableSpan;
-            var result:protocol.SignatureHelpItems = {
+            var result: protocol.SignatureHelpItems = {
                 items: helpItems.items,
                 applicableSpan: {
                     start: compilerService.host.positionToLineOffset(file, span.start),

tests/cases/fourslash/server/signatureHelp.ts

@@ -0,0 +1,16 @@
+/// <reference path="fourslash.ts"/>
+
+////function foo(data: number) {
+////}
+////
+////function bar {
+////    foo(/*1*/)
+////}
+
+goTo.marker('1');
+verify.signatureHelpPresent();
+verify.signatureHelpCountIs(1);
+verify.signatureHelpArgumentCountIs(0);
+
+verify.currentSignatureParameterCountIs(1);
+verify.currentSignatureHelpDocCommentIs('');