Show inline values

src/extension/common/vscodeapi.ts

@@ -128,3 +128,7 @@ export function startDebugging(
 ) {
     debug.startDebugging(folder, nameOrConfiguration, parentSession);
 }
+
+export function customRequest(command: string, args?: any): any {
+    return debug.activeDebugSession?.customRequest(command, args);
+}

src/extension/debugger/inlineValue/pythonInlineValueProvider.ts

@@ -0,0 +1,127 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+import {
+    InlineValue,
+    InlineValueContext,
+    InlineValuesProvider,
+    Range,
+    TextDocument,
+    InlineValueVariableLookup,
+    InlineValueEvaluatableExpression,
+} from 'vscode';
+import { customRequest } from '../../common/vscodeapi';
+
+export class PythonInlineValueProvider implements InlineValuesProvider {
+    public async provideInlineValues(
+        document: TextDocument,
+        viewPort: Range,
+        context: InlineValueContext,
+    ): Promise<InlineValue[]> {
+        let scopesRequest = await customRequest('scopes', { frameId: context.frameId });
+        let variablesRequest = await customRequest('variables', {
+            variablesReference: scopesRequest.scopes[0].variablesReference,
+        });
+
+        //https://docs.python.org/3/reference/lexical_analysis.html#keywords
+        const pythonKeywords = [
+            'False',
+            'await',
+            'else',
+            'import ',
+            'pass',
+            'None',
+            'break',
+            'except',
+            'in',
+            'raise',
+            'True',
+            'class',
+            'finally',
+            'is',
+            'return',
+            'and',
+            'continue',
+            'for',
+            'lambda',
+            'try',
+            'as',
+            'def',
+            'from',
+            'nonlocal',
+            'while',
+            'assert',
+            'del',
+            'global',
+            'not',
+            'with',
+            'async',
+            'elif',
+            'if',
+            'or',
+            'yield',
+            'self',
+        ];
+
+        const pythonVariables: any[] = variablesRequest.variables
+            .filter((variable: any) => variable.type)
+            .map((variable: any) => variable.name);
+
+        let variableRegex = new RegExp(
+            '(?:self.)?' + //match self. if present
+                '[a-zA-Z_][a-zA-Z0-9_]*', //math variable name
+            'g',
+        );
+
+        const allValues: InlineValue[] = [];
+        for (let l = viewPort.start.line; l <= viewPort.end.line; l++) {
+            const line = document.lineAt(l);
+            // Skip comments
+            if (line.text.trimStart().startsWith('#')) {
+                continue;
+            }
+
+            let code = removeCharsOutsideBraces(line.text);
+
+            for (let match = variableRegex.exec(code); match; match = variableRegex.exec(code)) {
+                let varName = match[0];
+                // Skip python keywords
+                if (pythonKeywords.includes(varName)) {
+                    continue;
+                }
+                if (pythonVariables.includes(varName.split('.')[0])) {
+                    if (varName.includes('self')) {
+                        const rng = new Range(l, match.index, l, match.index + varName.length);
+                        allValues.push(new InlineValueEvaluatableExpression(rng, varName));
+                    } else {
+                        const rng = new Range(l, match.index, l, match.index + varName.length);
+                        allValues.push(new InlineValueVariableLookup(rng, varName, false));
+                    }
+                }
+            }
+        }
+        return allValues;
+    }
+}
+
+function removeCharsOutsideBraces(code: string): string {
+    // Regular expression to find Python strings
+    const stringRegex = /(["'])(?:(?=(\\?))\2.)*?\1/g;
+
+    //Regular expression to match values inside {}
+    const insideBracesRegex = /{[^{}]*}/g;
+
+    return code.replace(stringRegex, (match) => {
+        const content = match.slice(1, -1);
+
+        let result = '';
+        let tempMatch;
+
+        while ((tempMatch = insideBracesRegex.exec(content)) !== null) {
+            result += tempMatch[0];
+        }
+        const processedContent = result || content;
+
+        return match[0] + processedContent + match[0];
+    });
+}

src/extension/extensionInit.ts

@@ -49,6 +49,7 @@ import { openReportIssue } from './common/application/commands/reportIssueComman
 import { buildApi } from './api';
 import { IExtensionApi } from './apiTypes';
 import { registerHexDebugVisualizationTreeProvider } from './debugger/visualizers/inlineHexDecoder';
+import { PythonInlineValueProvider } from './debugger/inlineValue/pythonInlineValueProvider';
 
 export async function registerDebugger(context: IExtensionContext): Promise<IExtensionApi> {
     const childProcessAttachService = new ChildProcessAttachService();
@@ -136,6 +137,7 @@ export async function registerDebugger(context: IExtensionContext): Promise<IExt
     context.subscriptions.push(
         debug.registerDebugAdapterDescriptorFactory(DebuggerTypeName, debugAdapterDescriptorFactory),
     );
+
     context.subscriptions.push(
         debug.onDidStartDebugSession((debugSession) => {
             const shouldTerminalFocusOnStart = getConfiguration('python', debugSession.workspaceFolder?.uri)?.terminal
@@ -195,6 +197,10 @@ export async function registerDebugger(context: IExtensionContext): Promise<IExt
         >('inlineHexDecoder', registerHexDebugVisualizationTreeProvider()),
     );
 
+    context.subscriptions.push(
+        languages.registerInlineValuesProvider({ language: 'python' }, new PythonInlineValueProvider()),
+    );
+
     context.subscriptions.push(
         debug.registerDebugVisualizationProvider('inlineHexDecoder', {
             provideDebugVisualization(_context, _token) {

src/test/pythonFiles/testClassVarType.py

@@ -0,0 +1,10 @@
+class Person:
+    def __init__(self, name, age):
+        self.name = name
+        self.age = age
+
+    def greet(self):
+        return f"Hello, my name is {self.name} and I a {self.age} years old."
+
+person1 = Person("John Doe", 30)
+person1.greet()

src/test/pythonFiles/testVarTypes.py

@@ -0,0 +1,6 @@
+var1 = 5
+var2 = 7
+var3 = "hola"
+var4 = {"a": 1, "b": 2}
+var5 = [1, 2, 3]
+var6 =var1 + var2