Fix wrong number of pages shown on initial display.

extensions/ql-vscode/src/adapt.ts

@@ -129,6 +129,7 @@ export interface ExtensionParsedResultSets {
   t: 'ExtensionParsed';
   pageNumber: number;
   numPages: number;
+  numInterpretedPages: number;
   selectedTable?: string; // when undefined, means 'show default table'
   resultSetNames: string[];
   resultSet: ResultSet;

extensions/ql-vscode/src/interface.ts

@@ -97,6 +97,10 @@ function numPagesOfResultSet(resultSet: RawResultSet): number {
   return Math.ceil(resultSet.schema.tupleCount / RAW_RESULTS_PAGE_SIZE);
 }
 
+function numInterpretedPages(interpretation: Interpretation | undefined): number {
+  return Math.ceil((interpretation?.sarif.runs[0].results?.length || 0) / INTERPRETED_RESULTS_PAGE_SIZE);
+}
+
 export class InterfaceManager extends DisposableObject {
   private _displayedQuery?: CompletedQuery;
   private _interpretation?: Interpretation;
@@ -352,11 +356,11 @@ export class InterfaceManager extends DisposableObject {
         );
         const adaptedSchema = adaptSchema(schema);
         const resultSet = adaptBqrs(adaptedSchema, chunk);
-
         return {
           t: 'ExtensionParsed',
           pageNumber: 0,
           numPages: numPagesOfResultSet(resultSet),
+          numInterpretedPages: numInterpretedPages(this._interpretation),
           resultSet: { t: 'RawResultSet', ...resultSet },
           selectedTable: undefined,
           resultSetNames,
@@ -407,7 +411,7 @@ export class InterfaceManager extends DisposableObject {
       metadata: this._displayedQuery.query.metadata,
       pageNumber,
       resultSetNames,
-      numPages: Math.ceil(this._interpretation.sarif.runs[0].results.length / INTERPRETED_RESULTS_PAGE_SIZE),
+      numPages: numInterpretedPages(this._interpretation),
     });
   }
 
@@ -460,6 +464,7 @@ export class InterfaceManager extends DisposableObject {
       pageNumber,
       resultSet: { t: 'RawResultSet', ...resultSet },
       numPages: numPagesOfResultSet(resultSet),
+      numInterpretedPages: numInterpretedPages(this._interpretation),
       selectedTable: selectedTable,
       resultSetNames,
     };

extensions/ql-vscode/src/view/result-tables.tsx

@@ -174,13 +174,22 @@ export class ResultTables
 
   renderPageButtons(resultSets: ExtensionParsedResultSets): JSX.Element {
     const selectedTable = this.state.selectedTable;
+
+    // FIXME: The extension, not the view, should be in charge of deciding whether to initially show
+    // a raw or alerts page. We have to conditionally recompute the number of pages here, because
+    // on initial load of query results, resultSets.numPages will have the number of *raw* pages available,
+    // not interpreted pages, because the extension doesn't know the view will default to showing alerts
+    // instead.
+    const numPages = selectedTable == ALERTS_TABLE_NAME ?
+      resultSets.numInterpretedPages : resultSets.numPages;
+
     const onChange = (e: React.ChangeEvent<HTMLInputElement>) => {
       this.setState({ selectedPage: e.target.value });
     };
     const choosePage = (input: string) => {
       const pageNumber = parseInt(input);
       if (pageNumber !== undefined && !isNaN(pageNumber)) {
-        const actualPageNumber = Math.max(0, Math.min(pageNumber - 1, resultSets.numPages - 1));
+        const actualPageNumber = Math.max(0, Math.min(pageNumber - 1, numPages - 1));
         vscode.postMessage({
           t: 'changePage',
           pageNumber: actualPageNumber,
@@ -199,17 +208,18 @@ export class ResultTables
     const nextPage = (e: React.MouseEvent<HTMLButtonElement, MouseEvent>) => {
       vscode.postMessage({
         t: 'changePage',
-        pageNumber: Math.min(resultSets.pageNumber + 1, resultSets.numPages - 1),
+        pageNumber: Math.min(resultSets.pageNumber + 1, numPages - 1),
         selectedTable,
       });
     };
+
     return <span>
       <button onClick={prevPage} >&lt;</button>
       <input size={3} value={this.state.selectedPage} onChange={onChange}
         onBlur={e => choosePage(e.target.value)}
         onKeyDown={e => { if (e.keyCode === 13) choosePage((e.target as HTMLInputElement).value); }}
       />
-      / {resultSets.numPages}
+      / {numPages}
       <button value=">" onClick={nextPage} >&gt;</button>
     </span>;
   }

extensions/ql-vscode/src/view/results.tsx

@@ -202,6 +202,7 @@ class App extends React.Component<{}, ResultsViewState> {
           parsedResultSets: {
             t: 'ExtensionParsed',
             numPages: msg.numPages,
+            numInterpretedPages: msg.numPages,
             resultSetNames: msg.resultSetNames,
             pageNumber: msg.pageNumber,
             resultSet: {