Playgound: Added support for multiple statements in addition to one e…

…xpression #19

Statements can be put on separate lines.
The return value of the last statement will become the evaluator result.

Playground/src/Compiler/ClassCompiler.ts

@@ -203,15 +203,21 @@ export class ClassCompiler
 		this.method.vars.push( compiledVariable );
 	}
 
+	// Playground: Generates code to return the value of the last statement iso self.
+
 	compileStatements()
 	{
+		let lastNode: SourceNode | undefined;
 		while( !this.parser.atMethodEnd() ) {
-			let node = this.compileStatement();
-			this.method.body.add( node );
+			lastNode = this.compileStatement();
+			this.method.body.add( lastNode );
 		}
 
-		if( !this.method.hasReturn && !this.method.isConstructor() )
-			this.method.body.add( this.sourceNode( "\t\treturn this;\n", "return self" ) );
+		if( lastNode && !this.method.hasReturn )
+			lastNode.prepend( "return " );
+
+		// if( !this.method.hasReturn && !this.method.isConstructor() )
+		// 	this.method.body.add( this.sourceNode( "\t\treturn this;\n", "return self" ) );
 	}
 
 	// A statement consists of an expression,

Playground/src/Evaluator.ts

@@ -83,7 +83,8 @@ export class Evaluator
 	{
 		let stClass: string =
 			"CLASS Evaluator EXTENDS Object MODULE Evaluator CLASSVARS '' VARS ''\n" +
-			"METHODS\nevaluate\n\t^ " + stExpression + ".\n!\n";
+			// "METHODS\nevaluate\n\t^ " + stExpression + ".\n!\n";
+			"METHODS\nevaluate\n\t" + stExpression + "\n!\n";
 
 		let classCompiler = new ClassCompiler();
 		classCompiler.allClasses = this.loadCompiledClasses( compiledClassesJson );

Playground/web/index.html

@@ -27,7 +27,7 @@
 						<td>
 							<h1 class="field">Help</h1>
 							<div id="helpTitleDiv">
-								Enter any Smalltalk expression below and then press [>Evaluate].
+								Enter any Smalltalk expression or statements below and then press [>Evaluate].
 								For more help on the syntax of SmallJS, look at
 								<a href="https://github.com/Small-JS/SmallJS/blob/main/Smalltalk/Smalltalk.md"
 									target="_blank">Smalltalk.md</a>
@@ -41,6 +41,7 @@ <h1 class="field">Help</h1>
 								&nbsp 'Hello, ' , 'World' , $! toString<br>
 								&nbsp 1 + 2 < 4 ifTrue: [ 'smaller' ]<br>
 								&nbsp #( 1 2 3 ) map: [ :n | n squared ]<br>
+								&nbsp | a |&nbsp a := 4.&nbsp a squared.<br>
 							</div>
 							<p style="margin:5px;"></p>
 						</td>