View CFG: export selected line and column position

Fixes: #2456

Author: aibaars

extensions/ql-vscode/src/language-support/ast-viewer/ast-cfg-commands.ts

@@ -42,9 +42,14 @@ export function getAstCfgCommands({
   const viewCfg = async () =>
     withProgress(
       async (progress, token) => {
-        const res = await cfgTemplateProvider.provideCfgUri(
-          window.activeTextEditor?.document,
-        );
+        const editor = window.activeTextEditor;
+        const res = !editor
+          ? undefined
+          : await cfgTemplateProvider.provideCfgUri(
+              editor.document,
+              editor.selection.active.line + 1,
+              editor.selection.active.character + 1,
+            );
         if (res) {
           await localQueries.compileAndRunQuery(
             QuickEvalType.None,

extensions/ql-vscode/src/language-support/contextual/location-finder.ts

@@ -24,7 +24,9 @@ import { QueryResultType } from "../../pure/new-messages";
 import { fileRangeFromURI } from "./file-range-from-uri";
 
 export const SELECT_QUERY_NAME = "#select";
-export const TEMPLATE_NAME = "selectedSourceFile";
+export const SELECTED_SOURCE_FILE = "selectedSourceFile";
+export const SELECTED_SOURCE_LINE = "selectedSourceLine";
+export const SELECTED_SOURCE_COLUMN = "selectedSourceColumn";
 
 export interface FullLocationLink extends LocationLink {
   originUri: Uri;
@@ -124,7 +126,7 @@ async function getLinksFromResults(
 
 function createTemplates(path: string): Record<string, string> {
   return {
-    [TEMPLATE_NAME]: path,
+    [SELECTED_SOURCE_FILE]: path,
   };
 }
 

extensions/ql-vscode/src/language-support/contextual/template-provider.ts

@@ -23,7 +23,9 @@ import { KeyType } from "./key-type";
 import {
   FullLocationLink,
   getLocationsForUriString,
-  TEMPLATE_NAME,
+  SELECTED_SOURCE_FILE,
+  SELECTED_SOURCE_LINE,
+  SELECTED_SOURCE_COLUMN,
 } from "./location-finder";
 import {
   qlpackOfDatabase,
@@ -253,7 +255,7 @@ export class TemplatePrintAstProvider {
 
     const query = queries[0];
     const templates: Record<string, string> = {
-      [TEMPLATE_NAME]: zippedArchive.pathWithinSourceArchive,
+      [SELECTED_SOURCE_FILE]: zippedArchive.pathWithinSourceArchive,
     };
 
     const results = await runContextualQuery(
@@ -284,15 +286,17 @@ export class TemplatePrintCfgProvider {
   }
 
   async provideCfgUri(
-    document?: TextDocument,
+    document: TextDocument,
+    line: number,
+    character: number,
   ): Promise<[Uri, Record<string, string>] | undefined> {
-    if (!document) {
-      return;
-    }
-
     return this.shouldUseCache()
-      ? await this.cache.get(document.uri.toString())
-      : await this.getCfgUri(document.uri.toString());
+      ? await this.cache.get(
+          `${document.uri.toString()}#${line}:${character}`,
+          line,
+          character,
+        )
+      : await this.getCfgUri(document.uri.toString(), line, character);
   }
 
   private shouldUseCache() {
@@ -301,6 +305,8 @@ export class TemplatePrintCfgProvider {
 
   private async getCfgUri(
     uriString: string,
+    line: number,
+    character: number,
   ): Promise<[Uri, Record<string, string>]> {
     const uri = Uri.parse(uriString, true);
     if (uri.scheme !== zipArchiveScheme) {
@@ -342,7 +348,9 @@ export class TemplatePrintCfgProvider {
     const queryUri = Uri.file(queries[0]);
 
     const templates: Record<string, string> = {
-      [TEMPLATE_NAME]: zippedArchive.pathWithinSourceArchive,
+      [SELECTED_SOURCE_FILE]: zippedArchive.pathWithinSourceArchive,
+      [SELECTED_SOURCE_LINE]: line.toString(),
+      [SELECTED_SOURCE_COLUMN]: character.toString(),
     };
 
     return [queryUri, templates];