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tsvm/assets/basic.js

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JavaScript
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/*
NOTE: do not allow concatenation of commands!
Operators
; - When used by PRINT and INPUT, concatenates two printables; numbers will have one space between them while strings
will not.
, - Function argument separator
+ - Just as in JS; concatenates two strings
Test Programs:
1 REM Random Maze
10 PRINT(CHR$(47+ROUND(RND(1))*45);)
20 GOTO 10
*/
if (system.maxmem() < 8192) {
println("Out of memory. BASIC requires 8K or more User RAM");
throw new Error("Out of memory");
}
let vmemsize = system.maxmem() - 5236;
let cmdbuf = []; // index: line number
let cmdbufMemFootPrint = 0;
let prompt = "Ok";
let lang = {};
lang.badNumberFormat = "Illegal number format";
lang.badOperatorFormat = "Illegal operator format";
lang.badFunctionCallFormat = "Illegal function call";
lang.unmatchedBrackets = "Unmatched brackets";
lang.missingOperand = "Missing operand";
lang.noSuchFile = "No such file";
lang.nextWithoutFor = function(line, varname) {
return "NEXT "+((varname !== undefined) ? ("'"+varname+"'") : "")+"without FOR in "+line;
};
lang.syntaxfehler = function(line, reason) {
return "Syntax error" + ((line !== undefined) ? (" in "+line) : "") + ((reason !== undefined) ? (": "+reason) : "");
};
lang.illegalType = function(line, obj) {
return "Type mismatch" + ((obj !== undefined) ? ' "' + obj + '"' : "") + ((line !== undefined) ? (" in "+line) : "");
};
lang.refError = function(line, obj) {
return "Unresolved reference" + ((obj !== undefined) ? ' "' + obj + '"' : "") + ((line !== undefined) ? (" in "+line) : "");
};
lang.nowhereToReturn = function(line) { return "RETURN without GOSUB in " + line; };
lang.errorinline = function(line, stmt, errobj) {
return 'Error'+((line !== undefined) ? (" in "+line) : "")+' on statement "'+stmt+'": '+errobj;
};
lang.parserError = function(line, errorobj) {
return "Parser error in " + line + ": " + errorobj;
};
lang.outOfMem = function(line) {
return "Out of memory in " + line;
};
lang.dupDef = function(line, varname) {
return "Duplicate definition"+((varname !== undefined) ? (" on "+varname) : "")+" in "+line;
};
lang.asgnOnConst = function(line, constname) {
return 'Trying to modify constant "'+constname+'" in '+line;
};
lang.subscrOutOfRng = function(line, object) {
return "Subscript out of range"+(object !== undefined ? (' for "'+object+'"') : '')+(line !== undefined ? (" in "+line) : "")
};
lang.aG = " arguments were given";
Object.freeze(lang);
let fs = {};
fs._close = function(portNo) {
com.sendMessage(portNo, "CLOSE");
};
fs._flush = function(portNo) {
com.sendMessage(portNo, "FLUSH");
};
// @return true if operation committed successfully, false if:
// - opening file with R-mode and target file does not exists
// throws if:
// - java.lang.NullPointerException if path is null
// - Error if operation mode is not "R", "W" nor "A"
fs.open = function(path, operationMode) {
var port = _BIOS.FIRST_BOOTABLE_PORT;
fs._flush(port[0]); fs._close(port[0]);
var mode = operationMode.toUpperCase();
if (mode != "R" && mode != "W" && mode != "A") {
throw Error("Unknown file opening mode: " + mode);
}
com.sendMessage(port[0], "OPEN"+mode+'"'+path+'",'+port[1]);
let response = com.getStatusCode(port[0]);
return (response == 0);
};
// @return the entire contents of the file in String
fs.readAll = function() {
var port = _BIOS.FIRST_BOOTABLE_PORT;
com.sendMessage(port[0], "READ");
var response = com.getStatusCode(port[0]);
if (135 == response) {
throw Error("File not opened");
}
if (response < 0 || response >= 128) {
throw Error("Reading a file failed with "+response);
}
return com.pullMessage(port[0]);
};
fs.write = function(string) {
var port = _BIOS.FIRST_BOOTABLE_PORT;
com.sendMessage(port[0], "WRITE"+string.length);
var response = com.getStatusCode(port[0]);
if (135 == response) {
throw Error("File not opened");
}
if (response < 0 || response >= 128) {
throw Error("Writing a file failed with "+response);
}
com.sendMessage(port[0], string);
fs._flush(port[0]); fs._close(port[0]);
};
Object.freeze(fs);
// implement your own con object here
// requirements: reset_graphics(), getch(), curs_set(int), hitterminate(), resetkeybuf(), addch(int)
let getUsedMemSize = function() {
var varsMemSize = 0;
Object.entries(bStatus.vars).forEach((pair, i) => {
var object = pair[1];
if (Array.isArray(object)) {
// TODO test 1-D array
varsMemSize += object.length * 8;
}
else if (!isNaN(object)) varsMemSize += 8;
else if (typeof object === "string" || object instanceof String) varsMemSize += object.length;
else varsMemSize += 1;
});
return varsMemSize + cmdbufMemFootPrint; // + array's dimsize * 8 + variables' sizeof literal + functions' expression length
}
let reLineNum = /^[0-9]+ /;
//var reFloat = /^([\-+]?[0-9]*[.][0-9]+[eE]*[\-+0-9]*[fF]*|[\-+]?[0-9]+[.eEfF][0-9+\-]*[fF]?)$/;
//var reDec = /^([\-+]?[0-9_]+)$/;
//var reHex = /^(0[Xx][0-9A-Fa-f_]+)$/;
//var reBin = /^(0[Bb][01_]+)$/;
// must match partial
let reNumber = /([0-9]*[.][0-9]+[eE]*[\-+0-9]*[fF]*|[0-9]+[.eEfF][0-9+\-]*[fF]?)|([0-9_]+)|(0[Xx][0-9A-Fa-f_]+)|(0[Bb][01_]+)/;
//let reOps = /\^|;|\*|\/|\+|\-|[<>=]{1,2}/;
let reNum = /[0-9]+/;
let tbasexit = false;
println("Terran BASIC 1.0 "+vmemsize+" bytes free");
println(prompt);
// variable object constructor
/** variable object constructor
* @param literal Javascript object or primitive
* @type derived from parseSigil or JStoBASICtype
* @see bStatus.builtin["="]
*/
let BasicVar = function(literal, type) {
this.bvLiteral = literal;
this.bvType = type;
}
// DEFUN (GW-BASIC equiv. of DEF FN) constructor
let BasicFun = function(params, expression) {
this.params = params;
this.expression = expression;
}
// Abstract Syntax Tree
// creates empty tree node
let BasicAST = function() {
this.astLnum = 0;
this.astDepth = 0;
this.astLeaves = [];
this.astSeps = [];
this.astValue = undefined;
this.astType = "null"; // literal, operator, string, number, array, function, null
this.toString = function() {
var sb = "";
var marker = ("lit" == this.astType) ? "i" :
("op" == this.astType) ? String.fromCharCode(177) :
("string" == this.astType) ? String.fromCharCode(182) :
("num" == this.astType) ? String.fromCharCode(162) :
("array" == this.astType) ? "[" : String.fromCharCode(163);
sb += "| ".repeat(this.astDepth) + marker+" Line "+this.astLnum+" ("+this.astType+")\n";
sb += "| ".repeat(this.astDepth+1) + "leaves: "+(this.astLeaves.length)+"\n";
sb += "| ".repeat(this.astDepth+1) + "value: "+this.astValue+" (type: "+typeof this.astValue+")\n";
for (var k = 0; k < this.astLeaves.length; k++) {
if (k > 0)
sb += "| ".repeat(this.astDepth+1) + " " + this.astSeps[k - 1] + "\n";
sb += this.astLeaves[k].toString(); + "\n";
}
sb += "| ".repeat(this.astDepth) + "`-----------------\n";
return sb;
};
}
let parseSigil = function(s) {
var rettype;
if (s.endsWith("$"))
rettype = "string";
else if (s.endsWith("%"))
rettype = "integer";
else if (s.endsWith("!") || s.endsWith("#"))
rettype = "float";
return {sgName:(rettype === undefined) ? s.toUpperCase() : s.substring(0, s.length - 1).toUpperCase(), sgType:rettype};
}
let literalTypes = ["string", "num", "bool", "array"];
/*
@param variable SyntaxTreeReturnObj, of which the 'troType' is defined in BasicAST.
@return a value, if the input type if string or number, its literal value will be returned. Otherwise will search the
BASIC variable table and return the literal value of the BasicVar; undefined will be returned if no such var exists.
*/
let resolve = function(variable) {
if (variable.troType === "internal_arrindexing_lazy")
return variable.troValue.arrValue;
else if (literalTypes.includes(variable.troType) || variable.troType.startsWith("internal_"))
return variable.troValue;
else if (variable.troType == "lit") {
var basicVar = bStatus.vars[parseSigil(variable.troValue).sgName];
return (basicVar !== undefined) ? basicVar.bvLiteral : undefined;
}
else if (variable.troType == "null")
return undefined;
else
throw "BasicIntpError: unknown variable with type "+variable.troType+", with value "+variable.troValue
}
let oneArg = function(lnum, args, action) {
if (args.length != 1) throw lang.syntaxfehler(lnum, args.length+lang.aG);
var rsvArg0 = resolve(args[0]);
if (rsvArg0 === undefined) throw lang.refError(lnum, args[0]);
return action(rsvArg0);
}
let oneArgNum = function(lnum, args, action) {
if (args.length != 1) throw lang.syntaxfehler(lnum, args.length+lang.aG);
var rsvArg0 = resolve(args[0]);
if (rsvArg0 === undefined) throw lang.refError(lnum, args[0]);
if (isNaN(rsvArg0)) throw lang.illegalType(lnum, args[0]);
return action(rsvArg0);
}
let twoArg = function(lnum, args, action) {
if (args.length != 2) throw lang.syntaxfehler(lnum, args.length+lang.aG);
var rsvArg0 = resolve(args[0]);
if (rsvArg0 === undefined) throw lang.refError(lnum, "LH:"+Object.entries(args[0]));
var rsvArg1 = resolve(args[1]);
if (rsvArg1 === undefined) throw lang.refError(lnum, "RH:"+Object.entries(args[1]));
return action(rsvArg0, rsvArg1);
}
let twoArgNum = function(lnum, args, action) {
if (args.length != 2) throw lang.syntaxfehler(lnum, args.length+lang.aG);
var rsvArg0 = resolve(args[0]);
if (rsvArg0 === undefined) throw lang.refError(lnum, args[0]);
if (isNaN(rsvArg0)) throw lang.illegalType(lnum, args[0]);
var rsvArg1 = resolve(args[1]);
if (rsvArg1 === undefined) throw lang.refError(lnum, args[1]);
if (isNaN(rsvArg1)) throw lang.illegalType(lnum, args[1]);
return action(rsvArg0, rsvArg1);
}
let threeArg = function(lnum, args, action) {
if (args.length != 3) throw lang.syntaxfehler(lnum, args.length+lang.aG);
var rsvArg0 = resolve(args[0]);
if (rsvArg0 === undefined) throw lang.refError(lnum, args[0]);
var rsvArg1 = resolve(args[1]);
if (rsvArg1 === undefined) throw lang.refError(lnum, args[1]);
var rsvArg2 = resolve(args[2]);
if (rsvArg2 === undefined) throw lang.refError(lnum, args[2]);
return action(rsvArg0, rsvArg1, rsvArg2);
}
let threeArgNum = function(lnum, args, action) {
if (args.length != 3) throw lang.syntaxfehler(lnum, args.length+lang.aG);
var rsvArg0 = resolve(args[0]);
if (rsvArg0 === undefined) throw lang.refError(lnum, args[0]);
if (isNaN(rsvArg0)) throw lang.illegalType(lnum, args[0]);
var rsvArg1 = resolve(args[1]);
if (rsvArg1 === undefined) throw lang.refError(lnum, args[1]);
if (isNaN(rsvArg1)) throw lang.illegalType(lnum, args[1]);
var rsvArg2 = resolve(args[2]);
if (rsvArg2 === undefined) throw lang.refError(lnum, args[2]);
if (isNaN(rsvArg2)) throw lang.illegalType(lnum, args[2]);
return action(rsvArg0, rsvArg1, rsvArg2);
}
let initBvars = function() {
return {
"NIL": new BasicVar([], "array"),
"PI": new BasicVar(Math.PI, "num"),
"TAU": new BasicVar(Math.PI * 2.0, "num"),
"EULER": new BasicVar(Math.E, "num")
};
}
let bStatus = {};
bStatus.gosubStack = [];
bStatus.forLnums = {}; // key: forVar, value: linenum
bStatus.forStack = []; // forVars only
bStatus.vars = initBvars(); // contains instances of BasicVars
bStatus.consts = {"NIL":1}; Object.freeze(bStatus.consts);
bStatus.defuns = {};
bStatus.rnd = 0; // stores mantissa (23 bits long) of single precision floating point number
bStatus.getArrayIndexFun = function(lnum, arrayName, array) {
return function(lnum, args) {
// TODO test 1-d array
// NOTE: BASIC arrays are index in column-major order, which is OPPOSITE of C/JS/etc.
var rsvArg0 = resolve(args[0]);
if (rsvArg0 === undefined) throw lang.refError(lnum, rsvArg0);
if (isNaN(rsvArg0)) throw lang.illegalType(lnum, rsvArg0);
return {arrValue: array[rsvArg0], arrObj: array, arrIndex: rsvArg0, arrName: arrayName}; //array[rsvArg0];
};
};
bStatus.builtin = {
/*
@param lnum line number
@param args instance of the SyntaxTreeReturnObj
if no args were given (e.g. "10 NEXT()"), args[0] will be: {troType: null, troValue: , troNextLine: 11}
if no arg text were given (e.g. "10 NEXT"), args will have zero length
*/
"REM" : function(lnum, args) {},
"=" : function(lnum, args) {
if (args.length != 2) throw lang.syntaxfehler(lnum, args.length+lang.aG);
var troValue = args[0].troValue;
var rh = resolve(args[1]);
if (rh === undefined) throw lang.refError(lnum, "RH:"+args[1].troValue);
if (troValue.arrObj !== undefined) {
if (isNaN(rh)) throw lang.illegalType(lnum, rh);
troValue.arrObj[troValue.arrIndex] = rh;
return {asgnVarName: troValue.arrName, asgnValue: rh};
}
else {
var sigil = parseSigil(troValue);
var type = sigil.sgType || JStoBASICtype(rh);
if (bStatus.consts[sigil.sgName]) throw lang.asgnOnConst(lnum, sigil.sgName);
bStatus.vars[sigil.sgName] = new BasicVar(rh, type);
return {asgnVarName: sigil.sgName, asgnValue: rh};
}
},
"==" : function(lnum, args) {
return twoArg(lnum, args, function(lh, rh) { return lh == rh; });
},
"<>" : function(lnum, args) {
return twoArg(lnum, args, function(lh, rh) { return lh != rh; });
},
"><" : function(lnum, args) {
return twoArg(lnum, args, function(lh, rh) { return lh != rh; });
},
"<=" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh <= rh; });
},
"=<" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh <= rh; });
},
">=" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh >= rh; });
},
"=>" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh >= rh; });
},
"<" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh < rh; });
},
">" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh > rh; });
},
"<<" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh << rh; });
},
">>" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh >> rh; });
},
"UNARYMINUS" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) { return -lh; });
},
"UNARYPLUS" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) { return +lh; });
},
"BAND" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh & rh; });
},
"BOR" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh | rh; });
},
"BXOR" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh ^ rh; });
},
"!" : function(lnum, args) { // Haskell-style CONS
return twoArg(lnum, args, function(lh, rh) {
if (isNaN(lh))
throw lang.illegalType(lnum, lh); // BASIC array is numbers only
if (!Array.isArray(rh))
throw lang.illegalType(lnum, rh);
return [lh].concat(rh);
});
},
"~" : function(lnum, args) { // array PUSH
return twoArg(lnum, args, function(lh, rh) {
if (isNaN(rh))
throw lang.illegalType(lnum, rh); // BASIC array is numbers only
if (!Array.isArray(lh))
throw lang.illegalType(lnum, lh);
return lh.concat([rh]);
});
},
"#" : function(lnum, args) { // array CONCAT
return twoArg(lnum, args, function(lh, rh) {
if (!Array.isArray(rh))
throw lang.illegalType(lnum, rh);
if (!Array.isArray(lh))
throw lang.illegalType(lnum, lh);
return lh.concat(rh);
});
},
"+" : function(lnum, args) { // addition, string concat
return twoArg(lnum, args, function(lh, rh) { return lh + rh; });
},
"-" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh - rh; });
},
"*" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh * rh; });
},
"/" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh / rh; });
},
"MOD" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return lh % rh; });
},
"^" : function(lnum, args) {
return twoArgNum(lnum, args, function(lh, rh) { return Math.pow(lh, rh); });
},
"TO" : function(lnum, args) {
return twoArgNum(lnum, args, function(from, to) {
var a = [];
if (from <= to) {
for (var k = from; k <= to; k++) {
a.push(k);
}
}
else {
for (var k = -from; k <= -to; k++) {
a.push(-k);
}
}
return a;
});
},
"STEP" : function(lnum, args) {
if (args.length != 2) throw lang.syntaxfehler(lnum, args.length+lang.aG);
var rsvArg0 = resolve(args[0]);
if (rsvArg0 === undefined) throw lang.refError(lnum, rsvArg0);
if (!Array.isArray(rsvArg0)) throw lang.illegalType(lnum, rsvArg0);
var rsvArg1 = resolve(args[1]);
if (rsvArg1 === undefined) throw lang.refError(lnum, rsvArg1);
if (isNaN(rsvArg1)) throw lang.illegalType(lnum, rsvArg1);
var a = []; var stepcnt = 0;
rsvArg0.forEach((v,i) => {
if (stepcnt == 0) a.push(v);
stepcnt = (stepcnt + 1) % rsvArg1;
});
return a;
},
"DIM" : function(lnum, args) {
return oneArgNum(lnum, args, function(size) {
if (size <= 0) throw lang.syntaxfehler(lnum, size);
var a = [];
for (var k = 0; k < size; k++) a.push(0);
return a;
});
},
"PRINT" : function(lnum, args, seps) {
if (args.length == 0)
println();
else {
for (var llll = 0; llll < args.length; llll++) {
// parse separators.
// ; - concat
// , - tab
// numbers always surrounded by 1 whitespace
if (llll >= 1) {
if (seps[llll - 1] == ",") print("\t");
}
var rsvArg = resolve(args[llll]);
if (rsvArg === undefined && args[llll] !== undefined && args[llll].troType != "null") throw lang.refError(lnum, args[llll].troValue);
print((rsvArg === undefined) ? "" : rsvArg);
}
}
if (args[args.length - 1] !== undefined && args[args.length - 1].troType != "null") println();
},
"EMIT" : function(lnum, args) {
if (args.length > 0) {
for (var llll = 0; llll < args.length; llll++) {
var lvalll = resolve(args[llll]);
if (isNaN(lvalll)) {
print(lvalll);
}
else {
con.addch(lvalll);
}
}
}
},
"POKE" : function(lnum, args) {
twoArgNum(lnum, args, function(lh, rh) { sys.poke(lh, rh); });
},
"PEEK" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) { return sys.peek(lh); });
},
"GOTO" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) {
if (lh < 0) throw lang.syntaxfehler(lnum, lh);
return lh;
});
},
"GOSUB" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) {
if (lh < 0) throw lang.syntaxfehler(lnum, lh);
bStatus.gosubStack.push(lnum + 1);
//println(lnum+" GOSUB into "+lh);
return lh;
});
},
"RETURN" : function(lnum, args) {
var r = bStatus.gosubStack.pop();
if (r === undefined) throw lang.nowhereToReturn(lnum);
//println(lnum+" RETURN to "+r);
return r;
},
"CLEAR" : function(lnum, args) {
bStatus.vars = initBvars();
},
"PLOT" : function(lnum, args) {
threeArgNum(lnum, args, function(xpos, ypos, color) { graphics.plotPixel(xpos, ypos, color); });
},
"AND" : function(lnum, args) {
if (args.length != 2) throw lang.syntaxfehler(lnum, args.length+lang.aG);
var rsvArg = args.map(function(it) { return resolve(it); });
rsvArg.forEach((v) => {
if (v === undefined) throw lang.refError(lnum, v);
if (typeof v !== "boolean") throw lang.illegalType(lnum, v);
});
var argum = rsvArg.map(function(it) {
if (it === undefined) throw lang.refError(lnum, it);
return it;
});
return argum[0] && argum[1];
},
"OR" : function(lnum, args) {
if (args.length != 2) throw lang.syntaxfehler(lnum, args.length+lang.aG);
var rsvArg = args.map(function(it) { return resolve(it); });
rsvArg.forEach((v) => {
if (v === undefined) throw lang.refError(lnum, v.value);
if (typeof v !== "boolean") throw lang.illegalType(lnum, v);
});
var argum = rsvArg.map(function(it) {
if (it === undefined) throw lang.refError(lnum, it);
return it;
});
return argum[0] || argum[1];
},
"RND" : function(lnum, args) {
if (!(args.length > 0 && args[0].troValue === 0))
bStatus.rnd = (bStatus.rnd * 214013 + 2531011) % 16777216; // GW-BASIC does this
return (bStatus.rnd) / 16777216;
},
"ROUND" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) { return Math.round(lh); });
},
"FLOOR" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) { return Math.floor(lh); });
},
"INT" : function(lnum, args) { // synonymous to FLOOR
return oneArgNum(lnum, args, function(lh) { return Math.floor(lh); });
},
"CEIL" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) { return Math.ceil(lh); });
},
"FIX" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) { return (lh|0); });
},
"CHR$" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) { return String.fromCharCode(lh); });
},
"TEST" : function(lnum, args) {
if (args.length != 1) throw lang.syntaxfehler(lnum, args.length+lang.aG);
return resolve(args[0]);
},
"FOR" : function(lnum, args) {
var asgnObj = resolve(args[0]);
// type check
if (asgnObj === undefined) throw lang.syntaxfehler(lnum);
if (!Array.isArray(asgnObj.asgnValue)) throw lang.illegalType(lnum, asgnObj);
var varname = asgnObj.asgnVarName;
// assign new variable
// the var itself will have head of the array, and the head itself will be removed from the array
bStatus.vars[varname] = new BasicVar(asgnObj.asgnValue[0], JStoBASICtype(asgnObj.asgnValue.shift()));
// stores entire array (sans head) into temporary storage
bStatus.vars["for var "+varname] = new BasicVar(asgnObj.asgnValue, "array");
// put the varname to forstack
bStatus.forLnums[asgnObj.asgnVarName] = lnum;
bStatus.forStack.push(asgnObj.asgnVarName);
},
"NEXT" : function(lnum, args) {
// if no args were given
if (args.length == 0 || (args.length == 1 && args.troType == "null")) {
// go to most recent FOR
var forVarname = bStatus.forStack.pop();
//serial.println(lnum+" NEXT > forVarname = "+forVarname);
if (forVarname === undefined) {
throw lang.nextWithoutFor(lnum);
}
bStatus.vars[forVarname].bvLiteral = bStatus.vars["for var "+forVarname].bvLiteral.shift();
if ((bStatus.vars[forVarname].bvLiteral !== undefined)) {
// feed popped value back, we're not done yet
bStatus.forStack.push(forVarname);
return bStatus.forLnums[forVarname] + 1;
}
else {
bStatus.vars[forVarname] === undefined; // unregister the variable
return lnum + 1;
}
}
throw lang.syntaxfehler(lnum, "extra arguments for NEXT");
},
/*
10 input;"what is your name";a$
£ Line 10 (function)
| leaves: 3
| value: input (type: string)
£ Line 0 (null)
| leaves: 0
| value: undefined (type: undefined)
`-----------------
| ;
| ¶ Line 10 (string)
| | leaves: 0
| | value: what is your name (type: string)
| `-----------------
| ;
| i Line 10 (literal)
| | leaves: 0
| | value: A$ (type: string)
| `-----------------
`-----------------
10 input "what is your name";a$
£ Line 10 (function)
| leaves: 2
| value: input (type: string)
| ¶ Line 10 (string)
| | leaves: 0
| | value: what is your name (type: string)
| `-----------------
| ;
| i Line 10 (literal)
| | leaves: 0
| | value: A$ (type: string)
| `-----------------
`-----------------
*/
"INPUT" : function(lnum, args) {
// just use tail-end arg as an input variable
var endArg = args.pop();
if (endArg === undefined) {
system.printerr("INPUT called with no arguments");
return undefined;
}
// print out prompt text
print("? ");
var inputstr = sys.read().trim();
// screw with the comma-separating because shrug
bStatus.vars[endArg.troValue] = new BasicVar(inputstr, JStoBASICtype(inputstr));
// return raw input string
return inputstr;
},
"END" : function(lnum, args) {
serial.println("Program terminated in "+lnum);
return Number.MAX_SAFE_INTEGER; // GOTO far-far-away
},
"SPC" : function(lnum, args) {
return oneArgNum(lnum, args, function(lh) { return " ".repeat(lh); });
},
};
Object.freeze(bStatus.builtin);
let bF = {};
bF._1os = {"!":1,"~":1,"#":1,"<":1,"=":1,">":1,"*":1,"+":1,"-":1,"/":1,"^":1};
bF._2os = {"<":1,"=":1,">":1};
bF._uos = {"+":1,"-":1};
bF._isNum = function(code) {
return (code >= 0x30 && code <= 0x39) || code == 0x5F;
};
bF._isNum2 = function(code) {
return (code >= 0x30 && code <= 0x39) || code == 0x5F || (code >= 0x41 && code <= 0x46) || (code >= 0x61 && code <= 0x66);
};
bF._isNumSep = function(code) {
return code == 0x2E || code == 0x42 || code == 0x58 || code == 0x62 || code == 0x78;
};
bF._is1o = function(code) {
return bF._1os[String.fromCharCode(code)]
};
bF._is2o = function(code) {
return bF._2os[String.fromCharCode(code)]
};
bF._isUnary = function(code) {
return bF._uos[String.fromCharCode(code)]
}
bF._isParenOpen = function(code) {
return (code == 0x28 || code == 0x5B);
};
bF._isParenClose = function(code) {
return (code == 0x29 || code == 0x5D);
};
bF._isParen = function(code) {
return bF._isParenOpen(code) || bF._isParenClose(code);
};
bF._isSep = function(code) {
return code == 0x2C || code == 0x3B;
};
// define operator precedence here...
bF._opPrc = {
// function call in itself has highest precedence
"^":1,
"*":2,"/":2,
"MOD":3,
"+":4,"-":4,
//";":5,
"<<":6,">>":6,
"<":7,">":7,"<=":7,"=<":7,">=":7,"=>":7,
"==":8,"<>":8,"><":8,
"BAND":8,
"BXOR":9,
"BOR":10,
"AND":11,
"OR":12,
"TO":13,
"STEP":14,
"!":15,"~":15, // array CONS and PUSH
"#": 16, // array concat
"=":999,
};
bF._opRh = {"^":1,"=":1,"!":1};
bF._keywords = {
};
bF._tokenise = function(lnum, cmd) {
var _debugprintStateTransition = false;
var k;
var tokens = [];
var states = [];
var sb = "";
var mode = "lit"; // literal, quote, paren, sep, operator, number; operator2, numbersep, number2, limbo, escape, quote_end
// NOTE: malformed numbers (e.g. "_b3", "_", "__") must be re-marked as literal or syntax error in the second pass
if (_debugprintStateTransition) println("@@ TOKENISE @@");
if (_debugprintStateTransition) println("Ln "+lnum+" cmd "+cmd);
// TOKENISE
for (k = 0; k < cmd.length; k++) {
var char = cmd[k];
var charCode = cmd.charCodeAt(k);
if (_debugprintStateTransition) print("Char: "+char+"("+charCode+"), state: "+mode);
if ("lit" == mode) {
if (0x22 == charCode) { // "
tokens.push(sb); sb = ""; states.push(mode);
mode = "qot";
}
else if (bF._isParen(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "paren";
}
else if (" " == char) {
tokens.push(sb); sb = ""; states.push(mode);
mode = "limbo";
}
else if (bF._isSep(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "sep";
}
else if (bF._isNum(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "num";
}
else if (bF._is1o(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "op";
}
else {
sb += char;
}
}
else if ("num" == mode) {
if (bF._isNum(charCode)) {
sb += char;
}
else if (bF._isNumSep(charCode)) {
sb += char;
mode = "nsep";
}
else if (0x22 == charCode) {
tokens.push(sb); sb = ""; states.push(mode);
mode = "qot";
}
else if (" " == char) {
tokens.push(sb); sb = ""; states.push(mode);
mode = "limbo";
}
else if (bF._isParen(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "paren"
}
else if (bF._isSep(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "sep";
}
else if (bF._is1o(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "op";
}
else {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "lit";
}
}
else if ("nsep" == mode) {
if (bF._isNum2(charCode)) {
sb += char;
mode = "n2";
}
else {
throw lang.syntaxfehler(lnum, lang.badNumberFormat);
}
}
else if ("n2" == mode) {
if (bF._isNum2(charCode)) {
sb += char;
}
else if (0x22 == charCode) {
tokens.push(sb); sb = ""; states.push("num");
mode = "qot";
}
else if (" " == char) {
tokens.push(sb); sb = ""; states.push("num");
mode = "limbo";
}
else if (bF._isParen(charCode)) {
tokens.push(sb); sb = "" + char; states.push("num");
mode = "paren"
}
else if (bF._isSep(charCode)) {
tokens.push(sb); sb = "" + char; states.push("num");
mode = "sep";
}
else if (bF._is1o(charCode)) {
tokens.push(sb); sb = "" + char; states.push("num");
mode = "op";
}
else {
tokens.push(sb); sb = "" + char; states.push("num");
mode = "lit";
}
}
else if ("op" == mode) {
if (bF._is2o(charCode)) {
sb += char;
mode = "o2";
}
else if (bF._isUnary(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
}
else if (bF._is1o(charCode)) {
throw lang.syntaxfehler(lnum, lang.badOperatorFormat);
}
else if (bF._isNum(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "num";
}
else if (0x22 == charCode) {
tokens.push(sb); sb = ""; states.push(mode);
mode = "qot";
}
else if (" " == char) {
tokens.push(sb); sb = ""; states.push(mode);
mode = "limbo";
}
else if (bF._isParen(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "paren"
}
else if (bF._isSep(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "sep";
}
else {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "lit";
}
}
else if ("o2" == mode) {
if (bF._is1o(charCode)) {
throw lang.syntaxfehler(lnum, lang.badOperatorFormat);
}
else if (bF._isNum(charCode)) {
tokens.push(sb); sb = "" + char; states.push("op");
mode = "num";
}
else if (0x22 == charCode) {
tokens.push(sb); sb = ""; states.push("op");
mode = "qot";
}
else if (" " == char) {
tokens.push(sb); sb = ""; states.push("op");
mode = "limbo";
}
else if (bF._isParen(charCode)) {
tokens.push(sb); sb = "" + char; states.push("op");
mode = "paren"
}
else if (bF._isSep(charCode)) {
tokens.push(sb); sb = "" + char; states.push("op");
mode = "sep";
}
else {
tokens.push(sb); sb = "" + char; states.push("op");
mode = "lit";
}
}
else if ("qot" == mode) {
if (0x22 == charCode) {
tokens.push(sb); sb = ""; states.push(mode);
mode = "quote_end";
}
else if (charCode == 0x5C) { // reverse solidus
tokens.push(sb); sb = "";
mode = "escape";
}
else {
sb += char;
}
}
else if ("escape" == mode) {
if (0x5C == charCode) // reverse solidus
sb += String.fromCharCode(0x5C);
else if ("n" == char)
sb += String.fromCharCode(0x0A);
else if ("t" == char)
sb += String.fromCharCode(0x09);
else if (0x22 == charCode) // "
sb += String.fromCharCode(0x22);
else if (0x27 == charCode)
sb += String.fromCharCode(0x27);
else if ("e" == char)
sb += String.fromCharCode(0x1B);
else if ("a" == char)
sb += String.fromCharCode(0x07);
else if ("b" == char)
sb += String.fromCharCode(0x08);
mode = "qot"; // ESCAPE is only legal when used inside of quote
}
else if ("quote_end" == mode) {
if (" " == char) {
sb = "";
mode = "limbo";
}
else if (0x22 == charCode) {
sb = "" + char;
mode = "qot";
}
else if (bF._isParen(charCode)) {
sb = "" + char;
mode = "paren";
}
else if (bF._isSep(charCode)) {
sb = "" + char;
mode = "sep";
}
else if (bF._isNum(charCode)) {
sb = "" + char;
mode = "num";
}
else if (bF._is1o(charCode)) {
sb = "" + char;
mode = "op"
}
else {
sb = "" + char;
mode = "lit";
}
}
else if ("limbo" == mode) {
if (char == " ") {
/* do nothing */
}
else if (0x22 == charCode) {
mode = "qot"
}
else if (bF._isParen(charCode)) {
sb = "" + char;
mode = "paren";
}
else if (bF._isSep(charCode)) {
sb = "" + char;
mode = "sep";
}
else if (bF._isNum(charCode)) {
sb = "" + char;
mode = "num";
}
else if (bF._is1o(charCode)) {
sb = "" + char;
mode = "op"
}
else {
sb = "" + char;
mode = "lit";
}
}
else if ("paren" == mode) {
if (char == " ") {
tokens.push(sb); sb = ""; states.push(mode);
mode = "limbo";
}
else if (0x22 == charCode) {
tokens.push(sb); sb = ""; states.push(mode);
mode = "qot"
}
else if (bF._isParen(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "paren";
}
else if (bF._isSep(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "sep";
}
else if (bF._isNum(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "num";
}
else if (bF._is1o(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "op"
}
else {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "lit";
}
}
else if ("sep" == mode) {
if (char == " ") {
tokens.push(sb); sb = ""; states.push(mode);
mode = "limbo";
}
else if (0x22 == charCode) {
tokens.push(sb); sb = ""; states.push(mode);
mode = "qot"
}
else if (bF._isParen(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "paren";
}
else if (bF._isSep(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "sep";
}
else if (bF._isNum(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "num";
}
else if (bF._is1o(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "op"
}
else {
tokens.push(sb); sb = "" + char; states.push(mode);
mode = "lit";
}
}
else {
throw "Unknown parser state: " + mode;
}
if (_debugprintStateTransition) println("->"+mode);
}
if (sb.length > 0) {
tokens.push(sb); states.push(mode);
}
// filter off initial empty token if the statement does NOT start with literal (e.g. "-3+5")
if (tokens[0].length == 0) {
tokens = tokens.slice(1, tokens.length);
states = states.slice(1, states.length);
}
// clean up operator2 and number2
for (k = 0; k < states.length; k++) {
if (states[k] == "o2") states[k] = "op";
else if (states[k] == "n2" || states[k] == "nsep") states[k] = "num";
}
if (tokens.length != states.length) throw "BasicIntpError: size of tokens and states does not match (line: "+lnum+")";
return { "tokens": tokens, "states": states };
};
bF._parserElaboration = function(lnum, tokens, states) {
var _debugprintElaboration = false;
if (_debugprintElaboration) println("@@ ELABORATION @@");
var k = 0;
// NOTE: malformed numbers (e.g. "_b3", "_", "__") must be re-marked as literal or syntax error
while (k < states.length) { // using while loop because array size will change during the execution
if (states[k] == "num" && !reNumber.test(tokens[k]))
states[k] = "lit";
else if (states[k] == "lit" && bF._opPrc[tokens[k].toUpperCase()] !== undefined)
states[k] = "op";
else if (tokens[k].toUpperCase() == "TRUE" || tokens[k].toUpperCase() == "FALSE")
states[k] = "bool";
// decimalise hex/bin numbers (because Nashorn does not support binary literal)
if (states[k] == "num") {
if (tokens[k].toUpperCase().startsWith("0B")) {
tokens[k] = parseInt(tokens[k].substring(2, tokens[k].length), 2) + "";
}
}
k += 1;
}
};
// DO NOT PERFORM SEMANTIC ANALYSIS HERE
// at this point you can't (and shouldn't) distinguish whether or not defuns/variables are previously declared
// a line has one of these forms:
// EXPRESSION -> LITERAL |
// BINARY_OP |
// UNARY_OP |
// FOR_LOOP |
// IF_STMT |
// WHILE_LOOP |
// FUNCTION_CALL |
// GROUPING
//
// LITERAL -> NUMBERS | FUNCTION_OR_VARIABLE_NAME | BOOLS | QUOTES
// IF_STMT -> "IF" EXPRESSION "THEN" EXPRESSION "ELSE" EXPRESSION |
// "IF" EXPRESSION "GOTO" NUMBERS "ELSE" NUMBERS |
// "IF" EXPRESSION "THEN" EXPRESSION |
// "IF" EXPRESSION "GOTO" NUMBERS
// FOR_LOOP -> "FOR" FUNCTION_OR_VARIABLE_NAME "=" EXPRESSION "TO" EXPRESSION "STEP" EXPRESSION |
// "FOR" FUNCTION_OR_VARIABLE_NAME "=" EXPRESSION "TO" EXPRESSION
// WHILE_LOOP -> "WHILE" EXPERSSION
// BINARY_OP -> EXPRSSION OPERATOR EXPRESSION
// UNARY_OP -> OPERATOR EXPRESSION
// FUNCTION_CALL -> LITERAL GROUPING
// GROUPING -> "(" EXPRESSION ")"
/*
for DEF*s, you might be able to go away with BINARY_OP, as the parsing tree would be:
f Line 10 (function)
| leaves: 1
| value: defun
| + Line 10 (operator)
| | leaves: 2
| | value: =
| | f Line 10 (function)
| | | leaves: 1
| | | value: sinc
| | | i Line 10 (literal)
| | | | leaves: 0
| | | | value: X
| | | `-----------------
| | `-----------------
| | + Line 10 (operator)
| | | leaves: 2
| | | value: /
| | | f Line 10 (function)
| | | | leaves: 1
| | | | value: sin
| | | | i Line 10 (literal)
| | | | | leaves: 0
| | | | | value: X
| | | | `-----------------
| | | `-----------------
| | | i Line 10 (literal)
| | | | leaves: 0
| | | | value: X
| | | `-----------------
| | `-----------------
| `-----------------
`-----------------
for input "DEFUN sinc(x) = sin(x) / x"
*/
/**
* @returns BasicAST
*/
bF._parseTokens = function(lnum, tokens, states, recDepth) {
function isSemanticLiteral(token, state) {
return "]" == token || ")" == token ||
"qot" == state || "num" == state || "bool" == state || "lit" == state;
}
var _debugSyntaxAnalysis = false;
if (_debugSyntaxAnalysis) serial.println("@@ SYNTAX ANALYSIS @@");
if (_debugSyntaxAnalysis) {
serial.println("Parser Ln "+lnum+", Rec "+recDepth);
serial.println("Tokens: "+tokens);
serial.println("States: "+states);
}
if (tokens.length != states.length) throw "BasicIntpError: size of tokens and states does not match (line: "+lnum+", recursion depth: "+recDepth+")";
if (tokens.length == 0) {
if (_debugSyntaxAnalysis) serial.println("*empty tokens*");
var retTreeHead = new BasicAST();
retTreeHead.depth = recDepth;
retTreeHead.lnum = lnum;
return retTreeHead;
}
var k;
var headWord = tokens[0].toLowerCase();
var treeHead = new BasicAST();
treeHead.astDepth = recDepth;
treeHead.astLnum = lnum;
// LITERAL
if (tokens.length == 1 && (isSemanticLiteral(tokens[0], states[0]))) {
// special case where there were only one word
if (recDepth == 0) {
// if that word is literal (e.g. "10 CLEAR"), interpret it as a function
if (states[0] == "lit") {
treeHead.astValue = tokens[0];
treeHead.astType = "function";
return treeHead;
}
// else, screw it
else {
throw lang.syntaxfehler(lnum, "TRAP_LITERALLY_LITERAL");
}
}
if (_debugSyntaxAnalysis) serial.println("literal/number: "+tokens[0]);
treeHead.astValue = ("qot" == states[0]) ? tokens[0] : tokens[0].toUpperCase();
treeHead.astType = ("qot" == states[0]) ? "string" : ("num" == states[0]) ? "num" : "lit";
}
else if (tokens[0].toUpperCase() == "IF" && states[0] != "qot") {
// find ELSE and THEN
var indexElse = undefined;
var indexThen = undefined;
for (k = tokens.length - 1; k >= 1; k--) {
if (indexElse === undefined && tokens[k].toUpperCase() == "ELSE" && states[k] != "qot") {
indexElse = k;
}
else if (indexThen === undefined && tokens[k].toUpperCase() == "THEN" && states[k] != "qot") {
indexThen = k;
}
}
// find GOTO and use it as THEN
var useGoto = false;
if (indexThen === undefined) {
for (k = (indexElse !== undefined) ? indexElse - 1 : tokens.length - 1; k >= 1; k--) {
if (indexThen == undefined && tokens[k].toUpperCase() == "GOTO" && states[k] != "qot") {
useGoto = true;
indexThen = k;
break;
}
}
}
// generate tree
if (indexThen === undefined) throw lang.syntaxfehler(lnum, "IF without THEN");
treeHead.astValue = "if";
treeHead.astType = "function";
treeHead.astLeaves[0] = bF._parseTokens(
lnum,
tokens.slice(1, indexThen),
states.slice(1, indexThen),
recDepth + 1
);
if (!useGoto)
treeHead.astLeaves[1] = bF._parseTokens(
lnum,
tokens.slice(indexThen + 1, (indexElse !== undefined) ? indexElse : tokens.length),
states.slice(indexThen + 1, (indexElse !== undefined) ? indexElse : tokens.length),
recDepth + 1
);
else
treeHead.astLeaves[1] = bF._parseTokens(
lnum,
[].concat("goto", tokens.slice(indexThen + 1, (indexElse !== undefined) ? indexElse : tokens.length)),
[].concat("lit", states.slice(indexThen + 1, (indexElse !== undefined) ? indexElse : tokens.length)),
recDepth + 1
);
if (indexElse !== undefined) {
treeHead.astLeaves[2] = bF._parseTokens(
lnum,
tokens.slice(indexElse + 1, tokens.length),
states.slice(indexElse + 1, tokens.length),
recDepth + 1
);
}
}
else {
// scan for operators with highest precedence, use rightmost one if multiple were found
var topmostOp;
var topmostOpPrc = 0;
var operatorPos = -1;
// find and mark position of separators and parentheses
// properly deal with the nested function calls
var parenDepth = 0;
var parenStart = -1;
var parenEnd = -1;
var separators = [];
// initial scan for adding omitted parens
for (k = 0; k < tokens.length; k++) {
if (tokens[k] == "(" && states[k] != "qot") {
parenDepth += 1;
if (parenStart == -1 && parenDepth == 1) parenStart = k;
}
else if (tokens[k] == ")" && states[k] != "qot") {
if (parenEnd == -1 && parenDepth == 1) parenEnd = k;
parenDepth -= 1;
}
if (parenDepth == 0) {
if (states[k] == "op" && isSemanticLiteral(tokens[k-1], states[k-1]) &&
((bF._opPrc[tokens[k].toUpperCase()] > topmostOpPrc) ||
(!bF._opRh[tokens[k].toUpperCase()] && bF._opPrc[tokens[k].toUpperCase()] == topmostOpPrc))
) {
topmostOp = tokens[k].toUpperCase();
topmostOpPrc = bF._opPrc[tokens[k].toUpperCase()];
operatorPos = k;
}
}
}
// == AUTOPAREN ==
// TODO do it properly by counting number of arguments and whatnot
if (parenDepth != 0) throw lang.syntaxfehler(lnum, lang.unmatchedBrackets);
if (_debugSyntaxAnalysis) serial.println("Paren position: "+parenStart+", "+parenEnd);
// if there is no paren or paren does NOT start index 1
// e.g. negative three should NOT require to be written as "-(3)"
if ((parenStart > 1 || parenStart == -1) && (operatorPos != 1 && operatorPos != 0) && states[0] == "lit" && states[1] != "op") {
// make a paren!
tokens = [].concat(tokens[0], "(", tokens.slice(1, tokens.length), ")");
states = [].concat(states[0], "paren", states.slice(1, states.length), "paren");
if (_debugSyntaxAnalysis) serial.println("inserting paren at right place");
if (_debugSyntaxAnalysis) serial.println(tokens.join(","));
return bF._parseTokens(lnum, tokens, states, recDepth);
}
// get the position of parens and separators
parenStart = -1; parenEnd = -1; parenDepth = 0;
topmostOpPrc = 0; operatorPos = -1;
// running again but now with newly added parens
for (k = 0; k < tokens.length; k++) {
if (tokens[k] == "(" && states[k] != "qot") {
parenDepth += 1;
if (parenStart == -1 && parenDepth == 1) parenStart = k;
}
else if (tokens[k] == ")" && states[k] != "qot") {
if (parenEnd == -1 && parenDepth == 1) parenEnd = k;
parenDepth -= 1;
}
if (parenDepth == 1 && states[k] == "sep") {
separators.push(k);
}
if (parenDepth == 0) {
if (states[k] == "op" && isSemanticLiteral(tokens[k-1], states[k-1]) &&
((bF._opPrc[tokens[k].toUpperCase()] > topmostOpPrc) ||
(!bF._opRh[tokens[k].toUpperCase()] && bF._opPrc[tokens[k].toUpperCase()] == topmostOpPrc))
) {
topmostOp = tokens[k].toUpperCase();
topmostOpPrc = bF._opPrc[tokens[k].toUpperCase()];
operatorPos = k;
}
}
}
if (parenDepth != 0) throw lang.syntaxfehler(lnum, lang.unmatchedBrackets);
if (_debugSyntaxAnalysis) serial.println("NEW Paren position: "+parenStart+", "+parenEnd);
// BINARY_OP/UNARY_OP
if (topmostOp !== undefined) {
if (_debugSyntaxAnalysis) serial.println("operator: "+topmostOp+", pos: "+operatorPos);
// BINARY_OP?
if (operatorPos > 0) {
var subtknL = tokens.slice(0, operatorPos);
var subtknR = tokens.slice(operatorPos + 1, tokens.length);
var substaL = states.slice(0, operatorPos);
var substaR = states.slice(operatorPos + 1, tokens.length);
treeHead.astValue = topmostOp;
treeHead.astType = "op";
treeHead.astLeaves[0] = bF._parseTokens(lnum, subtknL, substaL, recDepth + 1);
treeHead.astLeaves[1] = bF._parseTokens(lnum, subtknR, substaR, recDepth + 1);
}
else {
if (_debugSyntaxAnalysis) serial.println("re-parenthesising unary op");
// parenthesize the unary op
var unaryParenEnd = 1;
while (unaryParenEnd < tokens.length) {
if (states[unaryParenEnd] == "op" && bF._opPrc[tokens[unaryParenEnd]] > 1)
break;
unaryParenEnd += 1;
}
var newTokens = [].concat("(", tokens.slice(0, unaryParenEnd), ")", tokens.slice(unaryParenEnd, tokens.length));
var newStates = [].concat("paren", states.slice(0, unaryParenEnd), "paren", states.slice(unaryParenEnd, tokens.length));
return bF._parseTokens(lnum, newTokens, newStates, recDepth + 1);
}
}
// FUNCTION CALL
else {
if (_debugSyntaxAnalysis) serial.println("function call");
var currentFunction = (states[0] == "paren") ? undefined : tokens[0];
treeHead.astValue = ("-" == currentFunction) ? "UNARYMINUS" : ("+" == currentFunction) ? "UNARYPLUS" : currentFunction;
treeHead.astType = (currentFunction === undefined) ? "null" : "function";
if (_debugSyntaxAnalysis) serial.println("function name: "+treeHead.astValue);
var leaves = [];
var seps = [];
// if there is no paren (this part deals with unary ops ONLY!)
if (parenStart == -1 && parenEnd == -1) {
var subtkn = tokens.slice(1, tokens.length);
var substa = states.slice(1, tokens.length);
if (_debugSyntaxAnalysis) serial.println("subtokenA: "+subtkn.join("/"));
leaves.push(bF._parseTokens(lnum, subtkn, substa, recDepth + 1))
}
else if (parenEnd > parenStart) {
separators = [parenStart].concat(separators, [parenEnd]);
if (_debugSyntaxAnalysis) serial.println("separators: "+separators.join(","));
// recursively parse comma-separated arguments
// print ( plus ( 3 , 2 ) , times ( 8 , 7 ) )
// s ^ e
// separators = [1,8,15]
// plus ( 3 , 2 ) / times ( 8 , 7 )
// s ^ e s ^ e
// separators = [1,5] ; [1,5]
// 3 / 2 / 8 / 7
for (k = 1; k < separators.length; k++) {
var subtkn = tokens.slice(separators[k - 1] + 1, separators[k]);
var substa = states.slice(separators[k - 1] + 1, separators[k]);
if (_debugSyntaxAnalysis) serial.println("subtokenB: "+subtkn.join("/"));
leaves.push(bF._parseTokens(lnum, subtkn, substa, recDepth + 1));
}
separators.slice(1, separators.length - 1).forEach((v) => { if (v !== undefined) seps.push(tokens[v]) });
}
else throw lang.syntaxfehler(lnum, lang.badFunctionCallFormat);
treeHead.astLeaves = leaves;//.filter(function(__v) { return __v !== undefined; });
treeHead.astSeps = seps;
}
}
return treeHead;
};
// @return is defined in BasicAST
let JStoBASICtype = function(object) {
if (typeof object === "boolean") return "bool";
else if (Array.isArray(object)) return "array";
else if (!isNaN(object)) return "num";
else if (typeof object === "string" || object instanceof String) return "string";
else if (object === undefined) return "null";
else if (object.asgnVarName !== undefined) return "internal_assignment_object";
else if (object.arrValue !== undefined) return "internal_arrindexing_lazy";
// buncha error msgs
else if (object.arrIndex >= object.arrObj.length) throw lang.subscrOutOfRng(undefined, object.arrName);
else throw "BasicIntpError: un-translatable object with typeof "+(typeof object)+",\ntoString = "+object+",\nentries = "+Object.entries(object);
}
let SyntaxTreeReturnObj = function(type, value, nextLine) {
this.troType = type;
this.troValue = value;
this.troNextLine = nextLine;
}
bF._gotoCmds = {GOTO:1,GOSUB:1,RETURN:1,NEXT:1,END:1}; // put nonzero (truthy) value here
/**
* @param lnum line number of BASIC
* @param syntaxTree BasicAST
* @param recDepth recursion depth used internally
*
* @return syntaxTreeReturnObject if recursion is escaped
*/
bF._troNOP = function(lnum) { return new SyntaxTreeReturnObj("null", undefined, lnum + 1); }
bF._executeSyntaxTree = function(lnum, syntaxTree, recDepth) {
var _debugExec = true;
var recWedge = "> ".repeat(recDepth);
if (_debugExec) serial.println(recWedge+"@@ EXECUTE @@");
if (syntaxTree == undefined) return bF._troNOP(lnum);
else if (syntaxTree.astValue == undefined) { // empty meaningless parens
if (syntaxTree.astLeaves.length > 1) throw "WTF";
return bF._executeSyntaxTree(lnum, syntaxTree.astLeaves[0], recDepth);
}
else if (recDepth == 0 && syntaxTree.astValue.toUpperCase() == "REM")
return bF._troNOP(lnum);
else if (syntaxTree.astType == "function" || syntaxTree.astType == "op") {
if (_debugExec) serial.println(recWedge+"function|operator");
if (_debugExec) serial.println(recWedge+syntaxTree.toString());
var funcName = syntaxTree.astValue.toUpperCase();
var func = bStatus.builtin[funcName];
if (funcName == "IF") {
if (syntaxTree.astLeaves.length != 2 && syntaxTree.astLeaves.length != 3) throw lang.syntaxfehler(lnum);
var testedval = bF._executeSyntaxTree(lnum, syntaxTree.astLeaves[0], recDepth + 1);
if (_debugExec) {
serial.println(recWedge+"testedval:");
serial.println(recWedge+"type="+testedval.astType);
serial.println(recWedge+"value="+testedval.astValue);
serial.println(recWedge+"nextLine="+testedval.astNextLine);
}
try {
var iftest = bStatus.builtin["TEST"](lnum, [testedval]);
if (!iftest && syntaxTree.astLeaves[2] !== undefined)
return bF._executeSyntaxTree(lnum, syntaxTree.astLeaves[2], recDepth + 1);
else if (iftest)
return bF._executeSyntaxTree(lnum, syntaxTree.astLeaves[1], recDepth + 1);
else
return new SyntaxTreeReturnObj("null", undefined, lnum + 1);
}
catch (eeeee) {
throw lang.errorinline(lnum, "TEST", eeeee);
}
}
else {
var args = syntaxTree.astLeaves.map(function(it) { return bF._executeSyntaxTree(lnum, it, recDepth + 1); });
if (_debugExec) {
serial.println(recWedge+"fn call name: "+funcName);
serial.println(recWedge+"fn call args: "+(args.map(function(it) { return it.troType+" "+it.troValue; })).join(", "));
}
// func not in builtins (e.g. array access, user-defined function defuns)
if (func === undefined) {
var someVar = bStatus.vars[funcName];
if (someVar === undefined) {
throw lang.syntaxfehler(lnum, funcName + " is undefined");
}
if (someVar.bvType != "array") {
throw lang.syntaxfehler(lnum, funcName + " is not a function or an array");
}
// TODO calling from bStatus.defuns
func = bStatus.getArrayIndexFun(lnum, funcName, someVar.bvLiteral);
}
// call whatever the 'func' has whether it's builtin or we just made shit up right above
try {
var funcCallResult = func(lnum, args, syntaxTree.astSeps);
return new SyntaxTreeReturnObj(
JStoBASICtype(funcCallResult),
funcCallResult,
(bF._gotoCmds[funcName] !== undefined) ? funcCallResult : lnum + 1,
syntaxTree.astSeps
);
}
catch (eeeee) {
throw lang.errorinline(lnum, funcName, eeeee);
}
}
}
else if (syntaxTree.astType == "num") {
if (_debugExec) serial.println(recWedge+"num");
return new SyntaxTreeReturnObj(syntaxTree.astType, +(syntaxTree.astValue), lnum + 1);
}
else if (syntaxTree.astType == "string" || syntaxTree.astType == "lit" || syntaxTree.astType == "bool") {
if (_debugExec) serial.println(recWedge+"string|literal|bool");
return new SyntaxTreeReturnObj(syntaxTree.astType, syntaxTree.astValue, lnum + 1);
}
else if (syntaxTree.astType == "null") {
return new bF._executeSyntaxTree(lnum, syntaxTree.astLeaves[0], recDepth + 1);
}
else {
serial.println(recWedge+"Parse error in "+lnum);
serial.println(recWedge+syntaxTree.toString());
throw "Parse error";
}
};
// @returns: line number for the next command, normally (lnum + 1); if GOTO or GOSUB was met, returns its line number
bF._interpretLine = function(lnum, cmd) {
var _debugprintHighestLevel = true;
// TOKENISE
var tokenisedObject = bF._tokenise(lnum, cmd);
var tokens = tokenisedObject.tokens;
var states = tokenisedObject.states;
// ELABORATION : distinguish numbers and operators from literals
bF._parserElaboration(lnum, tokens, states);
// PARSING (SYNTAX ANALYSIS)
var syntaxTree = bF._parseTokens(lnum, tokens, states, 0);
if (_debugprintHighestLevel) serial.println("Final syntax tree:");
if (_debugprintHighestLevel) serial.println(syntaxTree.toString());
// EXECUTE
//try {
var execResult = bF._executeSyntaxTree(lnum, syntaxTree, 0);
return execResult.troNextLine;
//}
//catch (e) {
// throw lang.parserError(lnum, e);
//}
}; // end INTERPRETLINE
bF._basicList = function(v, i, arr) {
if (i < 10) print(" ");
if (i < 100) print(" ");
print(i);
print(" ");
println(v);
};
bF.list = function(args) { // LIST function
if (args.length == 1) {
cmdbuf.forEach(bF._basicList);
}
else if (args.length == 2) {
if (cmdbuf[args[1]] !== undefined)
bF._basicList(cmdbuf[args[1]], args[1], undefined);
}
else {
var lastIndex = (args[2] === ".") ? cmdbuf.length - 1 : (args[2] | 0);
var i = 0;
for (i = args[1]; i <= lastIndex; i++) {
var cmd = cmdbuf[i];
if (cmd !== undefined) {
bF._basicList(cmd, i, cmdbuf);
}
}
}
};
bF.system = function(args) { // SYSTEM function
tbasexit = true;
};
bF.new = function(args) { // NEW function
bStatus.vars = initBvars();
cmdbuf = [];
};
bF.renum = function(args) { // RENUM function
var newcmdbuf = [];
var linenumRelation = [[]];
var cnt = 10;
for (var k = 0; k < cmdbuf.length; k++) {
if (cmdbuf[k] !== undefined) {
newcmdbuf[cnt] = cmdbuf[k].trim();
linenumRelation[k] = cnt;
cnt += 10;
}
}
// deal with goto/gosub line numbers
for (k = 0; k < newcmdbuf.length; k++) {
if (newcmdbuf[k] !== undefined && newcmdbuf[k].toLowerCase().startsWith("goto ")) {
newcmdbuf[k] = "GOTO " + linenumRelation[newcmdbuf[k].match(reNum)[0]];
}
else if (newcmdbuf[k] !== undefined && newcmdbuf[k].toLowerCase().startsWith("gosub ")) {
newcmdbuf[k] = "GOSUB " + linenumRelation[newcmdbuf[k].match(reNum)[0]];
}
}
cmdbuf = newcmdbuf.slice(); // make shallow copy
// recalculate memory footprint
cmdbufMemFootPrint = 0;
cmdbuf.forEach((v, i, arr) =>
cmdbufMemFootPrint += ("" + i).length + 1 + v.length
);
};
bF.fre = function(args) {
println(vmemsize - getUsedMemSize());
};
bF.run = function(args) { // RUN function
var linenumber = 1;
var oldnum = 1;
do {
if (cmdbuf[linenumber] !== undefined) {
oldnum = linenumber;
linenumber = bF._interpretLine(linenumber, cmdbuf[linenumber]);
}
else {
linenumber += 1;
}
if (linenumber < 0) throw lang.badNumberFormat;
if (con.hitterminate()) {
println("Break in "+oldnum);
break;
}
} while (linenumber < cmdbuf.length)
con.resetkeybuf();
};
bF.save = function(args) { // SAVE function
if (args[1] === undefined) throw lang.missingOperand;
fs.open(args[1], "W");
var sb = "";
cmdbuf.forEach((v, i) => sb += i+" "+v+"\n");
fs.write(sb);
};
bF.load = function(args) { // LOAD function
if (args[1] === undefined) throw lang.missingOperand;
var fileOpened = fs.open(args[1], "R");
if (!fileOpened) {
throw lang.noSuchFile;
return;
}
var prg = fs.readAll();
// reset the environment
cmdbuf = [];
bStatus.vars = initBvars();
// read the source
prg.split('\n').forEach((line) => {
var i = line.indexOf(" ");
var lnum = line.slice(0, i);
if (isNaN(lnum)) throw lang.illegalType();
cmdbuf[lnum] = line.slice(i + 1, line.length);
});
};
bF.catalog = function(args) { // CATALOG function
if (args[1] === undefined) args[1] = "\\";
var pathOpened = fs.open(args[1], 'R');
if (!pathOpened) {
throw lang.noSuchFile;
return;
}
var port = _BIOS.FIRST_BOOTABLE_PORT[0];
com.sendMessage(port, "LIST");
println(com.pullMessage(port));
};
Object.freeze(bF);
while (!tbasexit) {
var line = sys.read().trim();
cmdbufMemFootPrint += line.length;
if (reLineNum.test(line)) {
var i = line.indexOf(" ");
cmdbuf[line.slice(0, i)] = line.slice(i + 1, line.length);
}
else if (line.length > 0) {
cmdbufMemFootPrint -= line.length;
var cmd = line.split(" ");
if (bF[cmd[0].toLowerCase()] === undefined) {
serial.printerr("Unknown command: "+cmd[0].toLowerCase());
println(lang.syntaxfehler());
}
else {
try {
bF[cmd[0].toLowerCase()](cmd);
}
catch (e) {
serial.printerr(e);
println(e);
}
}
println(prompt);
}
}
0;
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