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basic:fixing undefined tree node (e.g. '10 PRINT SPC(19);') would cause error

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minjaesong
2020-11-30 11:47:30 +09:00
parent 65dca0533a
commit 0b646c4d51
1 changed files with 5 additions and 3 deletions
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8
assets/basic.js
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@@ -1528,18 +1528,20 @@ bF._gotoCmds = {GOTO:1,GOSUB:1,RETURN:1,NEXT:1,END:1}; // put nonzero (truthy) v
* *
* @return syntaxTreeReturnObject if recursion is escaped * @return syntaxTreeReturnObject if recursion is escaped
*/ */
bF._troNOP = function(lnum) { return new SyntaxTreeReturnObj("null", undefined, lnum + 1); }
bF._executeSyntaxTree = function(lnum, syntaxTree, recDepth) { bF._executeSyntaxTree = function(lnum, syntaxTree, recDepth) {
var _debugExec = true; var _debugExec = true;
var recWedge = "> ".repeat(recDepth); var recWedge = "> ".repeat(recDepth);
if (_debugExec) serial.println(recWedge+"@@ EXECUTE @@"); if (_debugExec) serial.println(recWedge+"@@ EXECUTE @@");
if (syntaxTree.astValue == undefined) { // empty meaningless parens if (syntaxTree == undefined) return bF._troNOP(lnum);
else if (syntaxTree.astValue == undefined) { // empty meaningless parens
if (syntaxTree.astLeaves.length > 1) throw "WTF"; if (syntaxTree.astLeaves.length > 1) throw "WTF";
return bF._executeSyntaxTree(lnum, syntaxTree.astLeaves[0], recDepth); return bF._executeSyntaxTree(lnum, syntaxTree.astLeaves[0], recDepth);
} }
else if (syntaxTree === undefined || (recDepth == 0 && syntaxTree.astValue.toUpperCase() == "REM")) else if (recDepth == 0 && syntaxTree.astValue.toUpperCase() == "REM")
return new SyntaxTreeReturnObj("null", undefined, lnum + 1); return bF._troNOP(lnum);
else if (syntaxTree.astType == "function" || syntaxTree.astType == "op") { else if (syntaxTree.astType == "function" || syntaxTree.astType == "op") {
if (_debugExec) serial.println(recWedge+"function|operator"); if (_debugExec) serial.println(recWedge+"function|operator");
if (_debugExec) serial.println(recWedge+syntaxTree.toString()); if (_debugExec) serial.println(recWedge+syntaxTree.toString());