[refactor] commands

Minor Cleanup

LICENSE

@@ -0,0 +1,201 @@
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README.md

@@ -1,21 +1,39 @@
 # BF extension
 
-A simple language server based VSCode Extension for the ~~Brainfuck~~ ~~Branflakes~~ BF language. You can also execute your code and see its output.
+A simple language server based VSCode Extension for the (Branflakes?) (BrainFuck?) BF language. You can also execute your code and see its output.
+
+![BF](./assets/screenshot.png)
 
-![BF](https://chrisvrose.github.io/static/projects/screenshots/bf-server.png)
 ## Functionality
 
-- [X] Syntax
-- [X] Bracket matching
-- [X] Autocomplete suggestions
-- [X] Extension icon
-- [X] Execution
-  - [ ] Timeout
+- Syntax Highlighting
+- Execution
+- Autocomplete suggestions
+
 
 ### Execution
 
 Use the command to execute the code. 
-Issue is, because BF is a *turing complete* language, there is no way to know if the program will terminate or not. Hence for now, the command may lead to infinite execution. 
-Additionally, all input is done before program execution (If the program requests for input that hasn't been provided, `zero` is fed to it).
+Issue is, because BF is a **turing complete** language, there is no way to know if the program will terminate or not. Hence for now, the command may lead to infinite execution.
+If the program requires input, it will be requested as a prompt.
 
 TODO: Implement a timeout.
+
+### Changelog
+
+#### 0.2.0
+
+- Cycle input pointer on overflow/underflow
+- Refactoring code
+
+#### 0.1.0
+
+- Request input as required during execution
+- Using array-based indexing. This implies that only positive indices upto 30k are supported.
+
+
+### Building it
+
+1. `npm i` - Install all dependencies
+2. `npm i -g @vscode/vsce` - Install VSCode Command line CLI
+3. `vsce package` - Package to VSIX

client/src/BranFlakesExecutorVisitor.ts

@@ -0,0 +1,140 @@
+import { AbstractParseTreeVisitor } from 'antlr4ts/tree/AbstractParseTreeVisitor';
+import { LoopStmtContext } from './generated/bfParser';
+import { bfVisitor } from './generated/bfVisitor';
+import { DiagnosticSeverity } from 'vscode-languageclient';
+import { getTree } from './BranFlakesParseRunner';
+import { RuleNode } from 'antlr4ts/tree/RuleNode';
+import InputStrategy from './input/InputStrategy';
+
+export default class BranFlakesExecutorVisitor
+    extends AbstractParseTreeVisitor<Promise<void>>
+    implements bfVisitor<Promise<void>>
+{
+    /**
+     *
+     * @param input Input string
+     * @param inputPtr Input pointer to start from
+     */
+    constructor(
+        private inputStrategy: InputStrategy,
+        private logger: (val: string) => Thenable<string>,
+        private inputPtr: number = 0
+    ) {
+        super();
+    }
+    // /**
+    //  * The memory cells (Can work with negative cells this way)
+    //  */
+    // private cells: Map<number, number> = new Map();
+
+    private byteArraySize: number = 30000;
+    private byteArray: Int8Array = new Int8Array(this.byteArraySize);
+    /**
+     * Pointer
+     */
+    private ptr: number = 0;
+    /** Output string */
+    private outputStr: string = '';
+
+    
+
+    defaultResult() {
+        return Promise.resolve();
+    }
+    /**
+     * Run a file
+     * @param text
+     * @param fn
+     * @param inputStrategy
+     * @returns
+     */
+    static async run(
+        text: string,
+        fn: string,
+        inputStrategy: InputStrategy,
+        logger: (str: string) => Thenable<string>
+    ) {
+        //get tree and issues
+        const { tree, issues } = getTree(text, fn);
+
+        //get only errors
+        const x = issues.filter(e => e.type === DiagnosticSeverity.Error);
+        //if any error, drop
+        if (x.length > 0) {
+            throw Error('Errors exist');
+        }
+        // make visitor
+        const vis = new BranFlakesExecutorVisitor(inputStrategy, logger);
+        //visit the tree
+        await vis.visit(tree);
+
+        //get output
+        return vis.outputStr;
+    }
+
+    getCell(pointerIndex: number) {
+        return this.byteArray[pointerIndex];
+    }
+    setCell(pointerIndex: number, value: number): void {
+        this.byteArray[pointerIndex] = value;
+    }
+
+    async visitLoopStmt(ctx: LoopStmtContext) {
+        while ((this.getCell(this.ptr) ?? 0) !== 0) {
+            await this.visitChildren(ctx);
+        }
+    }
+    async visitPtrLeft() {
+        this.ptr = (this.ptr + this.byteArraySize - 1) % this.byteArraySize;
+    }
+    async visitPtrRight() {
+        this.ptr = (this.ptr + this.byteArraySize + 1) % this.byteArraySize;
+    }
+    async visitPtrIncr() {
+        const val = this.getCell(this.ptr);
+        this.setCell(this.ptr, (val + 1) % 256);
+    }
+    async visitPtrDecr() {
+        const val = this.getCell(this.ptr);
+        this.setCell(this.ptr, (val + 255) % 256);
+    }
+    async visitOutputStmt() {
+        const val = this.getCell(this.ptr) ?? 0;
+        const str = String.fromCharCode(val);
+
+        this.outputStr += str;
+    }
+
+    async visitInputStmt() {
+        //get char
+        const char = (await this.inputStrategy.getInput()) ?? 0;
+        //increment the input pointer after this
+        this.inputPtr++;
+        this.setCell(this.ptr, char);
+    }
+
+    // override for maintaining async
+    async visitChildren(node: RuleNode): Promise<void> {
+        let result = this.defaultResult();
+        await result;
+        let n = node.childCount;
+        for (let i = 0; i < n; i++) {
+            if (!this.shouldVisitNextChild(node, result)) {
+                break;
+            }
+            let c = node.getChild(i);
+            let childResult = c.accept(this);
+            result = this.aggregateResult(result, childResult);
+            await result;
+        }
+        return Promise.resolve();
+    }
+    // override for maintaining async
+    protected async aggregateResult(
+        aggregate: Promise<void>,
+        nextResult: Promise<void>
+    ): Promise<void> {
+        await aggregate;
+        return nextResult;
+    }
+}

client/src/BranFlakesParseRunner.ts

@@ -16,9 +16,9 @@ export interface TranslationError {
 export function getTree(str: string, fn: string) {
 	const charStreams = CharStreams.fromString(str, fn);
 	const lexer = new bfLexer(charStreams);
-	// const errorListener = this.errorManager.newErrorListener();
 	const issues: TranslationError[] = [];
 	// remove the error listener. We want to put our own
+	
 	lexer.removeErrorListeners();
 	lexer.addErrorListener({
 		syntaxError(source, o, line, charPositionInLine, msg, error) {

client/src/bfExecutor.ts

@@ -1,117 +0,0 @@
-import { AbstractParseTreeVisitor } from 'antlr4ts/tree/AbstractParseTreeVisitor';
-import { LoopStmtContext, ProgramContext } from '../../client/src/generated/bfParser';
-import { bfVisitor } from '../../client/src/generated/bfVisitor';
-import {getTree} from './bfGrammar';
-import { DiagnosticSeverity } from 'vscode-languageserver-types';
-
-/**
- * Run BF code
- * @param text 
- * @param fn 
- * @param input 
- * @returns 
- */
-export async function runBF(text:string,fn:string,input:string){
-	//get tree and issues
-	const {tree,issues} = getTree(text,fn);
-
-	//get only errors
-	const x = issues.filter(e=>e.type===DiagnosticSeverity.Error);
-	//if any error, drop
-	if(x.length>0) {
-		throw Error('Errors exist');
-	}
-	// make visitor
-	const vis = new BFExecutor(input);
-	
-	//visit the tree
-	vis.visit(tree);
-
-	//get output
-	return vis.outputStr;
-}
-
-
-class BFExecutor
-	extends AbstractParseTreeVisitor<void>
-	implements bfVisitor<void> {
-
-	/**
-	 * 
-	 * @param input Input string
-	 * @param inputPtr Input pointer to start from
-	 */
-	constructor(protected input: string='', protected inputPtr: number = 0) {
-		super();
-	}
-	/**
-	 * The memory cells (Can work with negative cells this way)
-	 */
-    protected cells: Map<number, number> = new Map();
-    /**
-	 * Pointer
-	 */
-	protected ptr: number = 0;
-	/** Output string */
-	protected outputStrArray:string[]=[];
-
-	/**
-	 * Output string (Available only after visiting)
-	 */
-	public get outputStr(){
-		return this.outputStrArray.join('');
-	}
-
-
-	defaultResult() {}
-
-	visitLoopStmt(ctx:LoopStmtContext){
-		while((this.cells.get(this.ptr)??0)!==0){
-			this.visitChildren(ctx);
-		}
-	}
-	visitPtrLeft() {
-		
-		--this.ptr;
-	}
-	visitPtrRight() {
-		++this.ptr;
-	}
-	visitPtrIncr() {
-
-    	const val = this.cells.get(this.ptr);
-    	if (val === undefined) {
-    		this.cells.set(this.ptr, 1);
-		} else if(val===255){
-			this.cells.delete(this.ptr);
-		}else{
-    		this.cells.set(this.ptr, val + 1);
-    	}
-	}
-	visitPtrDecr() {
-		// console.log('down',this.ptr,this.cells);
-
-    	const val = this.cells.get(this.ptr);
-    	if (val === undefined || val === 0) {
-    		this.cells.set(this.ptr, 255);
-    	} else if(val===1){
-			this.cells.delete(this.ptr);
-		}else{
-    		this.cells.set(this.ptr, val - 1);
-    	}
-	}
-	visitOutputStmt() {
-		const val = this.cells.get(this.ptr)??0;
-		const str = String.fromCharCode(val);
-		// console.log('op',str);
-		this.outputStrArray.push(str);
-	}
-
-	visitInputStmt(){
-		//get char
-		const char = this.input.charCodeAt(this.inputPtr)??0;
-		//increment the input pointer after this
-		this.inputPtr++;
-		this.cells.set(this.ptr,char);
-	}
-}

client/src/command/Command.ts

@@ -0,0 +1,5 @@
+
+export interface Command{
+	getCommandName():string;
+	getCommandHandler():(...args:any)=>Promise<any>;
+}

client/src/command/CompileCommand.ts

@@ -0,0 +1,26 @@
+import { window } from 'vscode';
+import { Command as BranFlakesCommand } from './Command';
+import { VSCodePromptInputStrategy } from '../input/VSCodePromptInputStrategy';
+import BranFlakesExecutorVisitor from '../BranFlakesExecutorVisitor';
+
+export class CompileBranFlakesCommand implements BranFlakesCommand {
+    getCommandName() {
+        return 'bf.execute';
+    }
+    getCommandHandler() {
+        return async () => {
+            const text = window.activeTextEditor.document.getText();
+            const fn = window.activeTextEditor.document.fileName;
+            const inputStrategy = new VSCodePromptInputStrategy(
+                window.showInputBox
+            );
+            const output = await BranFlakesExecutorVisitor.run(
+                text,
+                fn,
+                inputStrategy,
+                window.showInformationMessage
+            );
+            await window.showInformationMessage(`Output: ${output}`);
+        };
+    }
+}

client/src/extension.ts

@@ -4,70 +4,68 @@
  * ------------------------------------------------------------------------------------------ */
 
 import * as path from 'path';
-import { workspace, ExtensionContext,commands, window } from 'vscode';
-import {runBF} from './bfExecutor';
+import { ExtensionContext, commands, window } from 'vscode';
 import {
-	LanguageClient,
-	LanguageClientOptions,
-	ServerOptions,
-	TransportKind
+    LanguageClient,
+    LanguageClientOptions,
+    ServerOptions,
+    TransportKind,
 } from 'vscode-languageclient';
-
+import { CompileBranFlakesCommand } from './command/CompileCommand';
 
 let client: LanguageClient;
 
 export function activate(context: ExtensionContext) {
-	// The server is implemented in node
-	let serverModule = context.asAbsolutePath(
-		path.join('server', 'dist', 'server.js')
-	);
-	// The debug options for the server
-	// --inspect=6009: runs the server in Node's Inspector mode so VS Code can attach to the server for debugging
-	let debugOptions = { execArgv: ['--nolazy', '--inspect=6009'] };
+    // The server is implemented in node
+    let serverModule = context.asAbsolutePath(
+        path.join('server', 'dist', 'server.js')
+    );
+    // The debug options for the server
+    // --inspect=6009: runs the server in Node's Inspector mode so VS Code can attach to the server for debugging
+    let debugOptions = { execArgv: ['--nolazy', '--inspect=6009'] };
 
-	// If the extension is launched in debug mode then the debug server options are used
-	// Otherwise the run options are used
-	let serverOptions: ServerOptions = {
-		run: { module: serverModule, transport: TransportKind.ipc },
-		debug: {
-			module: serverModule,
-			transport: TransportKind.ipc,
-			options: debugOptions
-		}
-	};
+    // If the extension is launched in debug mode then the debug server options are used
+    // Otherwise the run options are used
+    let serverOptions: ServerOptions = {
+        run: { module: serverModule, transport: TransportKind.ipc },
+        debug: {
+            module: serverModule,
+            transport: TransportKind.ipc,
+            options: debugOptions,
+        },
+    };
 
-	// Options to control the language client
-	let clientOptions: LanguageClientOptions = {
-		// Register the server for plain text documents
-		documentSelector: [{ scheme: 'file', language: 'bf' }]
-	};
+    // Options to control the language client
+    let clientOptions: LanguageClientOptions = {
+        // Register the server for plain text documents
+        documentSelector: [{ scheme: 'file', language: 'bf' }],
+    };
 
-	const command = 'bf.execute';
-	const commandHandler = async()=>{
-		const text= window.activeTextEditor.document.getText();
-		const fn = window.activeTextEditor.document.fileName;
-		const input = await window.showInputBox({prompt:'Enter input (If not enough, program will assume 0)'});
-		const output = await runBF(text,fn,input);
-		await window.showInformationMessage(`Output: ${output}`);
-	};
+    const branFlakesCommands = [new CompileBranFlakesCommand()];
+    for (let branFlakesCommand of branFlakesCommands) {
+        context.subscriptions.push(
+            commands.registerCommand(
+                branFlakesCommand.getCommandName(),
+                branFlakesCommand.getCommandHandler()
+            )
+        );
+    }
 
-	context.subscriptions.push(commands.registerCommand(command,commandHandler));
+    // Create the language client and start the client.
+    client = new LanguageClient(
+        'brainfucklanguageserver',
+        'Brainfuck Language Server',
+        serverOptions,
+        clientOptions
+    );
 
-	// Create the language client and start the client.
-	client = new LanguageClient(
-		'brainfucklanguageserver',
-		'Brainfuck Language Server',
-		serverOptions,
-		clientOptions
-	);
-
-	// Start the client. This will also launch the server
-	client.start();
+    // Start the client. This will also launch the server
+    client.start();
 }
 
 export function deactivate(): Thenable<void> | undefined {
-	if (!client) {
-		return undefined;
-	}
-	return client.stop();
+    if (!client) {
+        return undefined;
+    }
+    return client.stop();
 }

client/src/input/InputStrategy.ts

@@ -0,0 +1,4 @@
+
+export default interface InputStrategy {
+	getInput(): Promise<number>;
+}

client/src/input/VSCodePromptInputStrategy.ts

@@ -0,0 +1,28 @@
+import { CancellationToken, InputBoxOptions } from 'vscode';
+import InputStrategy from './InputStrategy';
+
+export class VSCodePromptInputStrategy implements InputStrategy {
+    private inputQueue: string = '';
+    constructor(
+        private requestor: (
+            promptOptions?: InputBoxOptions,
+            cancelToken?: CancellationToken
+        ) => Thenable<string>
+    ) {}
+
+    async getInput(): Promise<number> {
+        while (this.inputQueue.length == 0) {
+            await this.requestInputFromPrompt();
+        }
+        const character = this.inputQueue.charCodeAt(0);
+        this.inputQueue = this.inputQueue.substring(1);
+
+        return character;
+    }
+    private async requestInputFromPrompt() {
+        const inputPrompt = await this.requestor({
+            prompt: 'More input is required. Please provide input:',
+        });
+        this.inputQueue += inputPrompt;
+    }
+}

package.json

@@ -5,7 +5,7 @@
 	"author": "Atreya Bain",
 	"license": "MIT",
 	"publisher": "atreyabain",
-	"version": "0.0.4",
+	"version": "0.2.0",
 	"icon": "assets/128.png",
 	"categories": [],
 	"keywords": [

server/src/server.ts

@@ -18,10 +18,10 @@ import {
 	Position,
 } from 'vscode-languageserver';
 
-// import * as path from 'path';
+
 
 import { TextDocument } from 'vscode-languageserver-textdocument';
-// import { getTree } from './bfGrammar';
+
 
 // Create a connection for the server. The connection uses Node's IPC as a transport.
 // Also include all preview / proposed LSP features.