basic: ON..GOSUB, CLEAR, rearranged platform menu

index.html

@@ -191,6 +191,7 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
                <li><a class="dropdown-item" href="?platform=msx-libcv">MSX (libCV)</a></li>
                <li><a class="dropdown-item" href="?platform=apple2">Apple ][+</a></li>
                <li><a class="dropdown-item" href="?platform=zx">ZX Spectrum</a></li>
+               <li><a class="dropdown-item" href="?platform=x86">x86 (FreeDOS)</a></li>
               </ul>
           </li>
           <li class="dropdown dropdown-submenu">
@@ -200,6 +201,7 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
                <li><a class="dropdown-item" href="?platform=mw8080bw">Midway 8080</a></li>
                <li><a class="dropdown-item" href="?platform=galaxian-scramble">Galaxian/Scramble</a></li>
                <li><a class="dropdown-item" href="?platform=vector-z80color">Atari Color Vector (Z80)</a></li>
+               <li><a class="dropdown-item" href="?platform=vector-ataricolor">Atari Color Vector (6502)</a></li>
                <li><a class="dropdown-item" href="?platform=williams-z80">Williams (Z80)</a></li>
                <li><a class="dropdown-item" href="?platform=sound_williams-z80">Williams Sound (Z80)</a></li>
              </ul>
@@ -211,6 +213,14 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
                <li><a class="dropdown-item" href="?platform=verilog-vga">Verilog (VGA @ 25 Mhz)</a></li>
              </ul>
           </li>
+         <li class="dropdown dropdown-submenu">
+          <a tabindex="-1" href="#">Text-Based</a>
+          <ul class="dropdown-menu">
+            <li><a class="dropdown-item" href="?platform=basic">BASIC</a></li>
+            <li><a class="dropdown-item" href="?platform=zmachine">Z-Machine</a></li>
+            <li><a class="dropdown-item" href="?platform=markdown">Markdown Text Editor</a></li>
+          </ul>
+        </li>
         <li class="dropdown dropdown-submenu">
           <a tabindex="-1" href="#">MAME Emulators</a>
           <ul class="dropdown-menu">
@@ -222,15 +232,6 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
             <li><a class="dropdown-item" href="?platform=nes.mame">NES (MAME)</a></li>
           </ul>
        </li>
-         <li class="dropdown dropdown-submenu">
-             <a tabindex="-1" href="#">Other</a>
-             <ul class="dropdown-menu">
-               <li><a class="dropdown-item" href="?platform=vector-ataricolor">Atari Color Vector (6502)</a></li>
-               <li><a class="dropdown-item" href="?platform=x86">x86 (FreeDOS)</a></li>
-               <li><a class="dropdown-item" href="?platform=zmachine">Z-Machine</a></li>
-               <li><a class="dropdown-item" href="?platform=markdown">Markdown Text Editor</a></li>
-             </ul>
-          </li>
     </ul>
   </span>
 

src/common/basic/compiler.ts

@@ -88,7 +88,7 @@ export interface RETURN_Statement {
 }
 
 export interface ONGOTO_Statement {
-    command: "ONGOTO";
+    command: "ONGOTO" | "ONGOSUB";
     expr: Expr;
     labels: Expr[];
 }
@@ -706,9 +706,11 @@ export class BASICParser {
     }
     stmt__ON() : ONGOTO_Statement {
         var expr = this.parseExpr();
-        this.expectToken('GOTO');
+        var gotok = this.consumeToken();
+        var cmd = {GOTO:'ONGOTO', GOSUB:'ONGOSUB'}[gotok.str];
+        if (!cmd) this.compileError(`There should be a GOTO or GOSUB here.`);
         var labels = this.parseLabelList();
-        return { command:'ONGOTO', expr:expr, labels:labels };
+        return { command:cmd, expr:expr, labels:labels };
     }
     stmt__DEF() : DEF_Statement {
         var lexpr = this.parseVarSubscriptOrFunc();
@@ -728,6 +730,9 @@ export class BASICParser {
         this.decls[lexpr.name] = this.lasttoken.$loc;
         return { command:'GET', lexpr:lexpr };
     }
+    stmt__CLEAR() : NoArgStatement {
+        return { command:'CLEAR' };
+    }
     // TODO: CHANGE A TO A$ (4th edition, A(0) is len and A(1..) are chars)
     stmt__OPTION() : OPTION_Statement {
         var tokname = this.consumeToken();
@@ -826,7 +831,7 @@ export const ECMA55_MINIMAL : BASICOptions = {
     validKeywords : ['BASE','DATA','DEF','DIM','END',
         'FOR','GO','GOSUB','GOTO','IF','INPUT','LET','NEXT','ON','OPTION','PRINT',
         'RANDOMIZE','READ','REM','RESTORE','RETURN','STEP','STOP','SUB','THEN','TO'
-    ],
+    ], // TODO: no ON...GOSUB
     validFunctions : ['ABS','ATN','COS','EXP','INT','LOG','RND','SGN','SIN','SQR','TAB','TAN'],
     validOperators : ['=', '<>', '<', '>', '<=', '>=', '+', '-', '*', '/', '^'],
     printZoneLength : 15,
@@ -857,7 +862,7 @@ export const ALTAIR_BASIC40 : BASICOptions = {
     tickComments : false,
     validKeywords : null, // all
     validFunctions : null, // all
-    validOperators : null, // all ['\\','MOD','NOT','AND','OR','XOR','EQV','IMP'],
+    validOperators : null, // all
     printZoneLength : 15,
     numericPadding : true,
     checkOverflow : true,
@@ -884,10 +889,19 @@ export const APPLESOFT_BASIC : BASICOptions = {
     maxStringLength : 255,
     sparseArrays : false,
     tickComments : false,
-    validKeywords : null, // all
+    validKeywords : [
-    validFunctions : ['ABS','ATN','COS','EXP','INT','LOG','RND','SGN','SIN','SQR','TAN',
+        'CLEAR','LET','DIM','DEF','FN','GOTO','GOSUB','RETURN','ON','POP',
+        'FOR','TO','NEXT','IF','THEN','END','STOP','ONERR','RESUME',
+        'PRINT','INPUT','GET','HOME','HTAB','VTAB',
+        'INVERSE','FLASH','NORMAL','TEXT',
+        'GR','COLOR','PLOT','HLIN','VLIN',
+        'HGR','HGR2','HPLOT','HCOLOR','AT',
+        'DATA','READ','RESTORE',
+        'REM','TRACE','NOTRACE'],
+    validFunctions : [
+        'ABS','ATN','COS','EXP','INT','LOG','RND','SGN','SIN','SQR','TAN',
         'LEN','LEFT$','MID$','RIGHT$','STR$','VAL','CHR$','ASC',
-                      'FRE','SCRN','PDL','PEEK'], // TODO
+        'FRE','SCRN','PDL','PEEK','POS'],
     validOperators : ['=', '<>', '<', '>', '<=', '>=', '+', '-', '*', '/', '^', 'AND', 'NOT', 'OR'],
     printZoneLength : 16,
     numericPadding : false,

src/common/basic/runtime.ts

@@ -90,15 +90,18 @@ export class BASICRuntime {
     reset() {
         this.curpc = 0;
         this.dataptr = 0;
-        this.vars = {};
+        this.clearVars();
-        this.arrays = {};
-        this.defs = {};
         this.forLoops = [];
         this.returnStack = [];
         this.column = 0;
         this.running = true;
         this.exited = false;
     }
+    clearVars() {
+        this.vars = {};
+        this.arrays = {};
+        this.defs = {}; // TODO? only in interpreters
+    }
     
     getBuiltinFunctions() {
         var fnames = this.program && this.opts.validFunctions;
@@ -119,18 +122,13 @@ export class BASICRuntime {
     }
 
     getLineForPC(pc:number) {
-        var line;
+        var stmt = this.allstmts[pc];
-        do {
+        return stmt && stmt.$loc && stmt.$loc.line;
-            line = this.pc2line.get(pc);
-            if (line != null) break;
-        } while (--pc >= 0);
-        return line;
     }
 
     getLabelForPC(pc:number) {
-        var lineno = this.getLineForPC(pc);
+        var stmt = this.allstmts[pc];
-        var pgmline = this.program.lines[lineno];
+        return stmt && stmt.$loc && stmt.$loc.label;
-        return pgmline ? pgmline.label : '?';
     }
 
     getCurrentSourceLocation() : SourceLocation {
@@ -138,6 +136,11 @@ export class BASICRuntime {
         return stmt && stmt.$loc;
     }
 
+    getCurrentLabel() : string {
+        var loc = this.getCurrentSourceLocation();
+        return loc && loc.label;
+    }
+
     getStatement() {
         return this.allstmts[this.curpc];
     }
@@ -439,6 +442,13 @@ export class BASICRuntime {
         if (value < 1 || value > labels.length)
             this.runtimeError(`I needed a number between 1 and ${labels.length}, but I got ${value}.`);
         this.gotoLabel(labels[value-1]);
+    
+    }
+    onGosubLabel(value: number, ...labels: string[]) {
+        value = this.ROUND(value);
+        if (value < 1 || value > labels.length)
+            this.runtimeError(`I needed a number between 1 and ${labels.length}, but I got ${value}.`);
+        this.gosubLabel(labels[value-1]);
     }
 
     nextDatum() : basic.Value {
@@ -550,7 +560,10 @@ export class BASICRuntime {
     do__ONGOTO(stmt : basic.ONGOTO_Statement) {
         var expr = this.expr2js(stmt.expr);
         var labels = stmt.labels.map((arg) => this.expr2js(arg, {isconst:true})).join(', ');
+        if (stmt.command == 'ONGOTO')
             return `this.onGotoLabel(${expr}, ${labels})`;
+        else
+            return `this.onGosubLabel(${expr}, ${labels})`;
     }
 
     do__DATA() {
@@ -596,6 +609,10 @@ export class BASICRuntime {
                 })`;
     }
 
+    do__CLEAR() {
+        return 'this.clearVars()';
+    }
+
     // TODO: ONERR, ON ERROR GOTO
     // TODO: "SUBSCRIPT ERROR" (range check)
     // TODO: gosubs nested too deeply

src/platform/basic.ts

@@ -173,7 +173,17 @@ class BASICPlatform implements Platform {
         $.extend(true, this.runtime, state);
     }
     getDebugTree() {
-        return this.runtime;
+        return {
+            Variables: this.runtime.vars,
+            Arrays: this.runtime.arrays,
+            Functions: this.runtime.defs,
+            ForLoops: this.runtime.forLoops,
+            ReturnStack: this.runtime.returnStack,
+            CurrentLine: this.runtime.getCurrentLabel(),
+            NextDatum: this.runtime.datums[this.runtime.dataptr],
+            Dialect: this.runtime.opts,
+            Internals: this.runtime,
+        }
     }
     inspect(sym: string) {
         var o = this.runtime.vars[sym];