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2eb6a4a99e1e0d50dc3d9940298d13cc222e7449
tsvm/assets/tbas/basic.js
minjaesong 2eb6a4a99e kinda working AST building?
2020-06-07 09:17:01 +09:00

672 lines
22 KiB
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
*/
var vmemsize = system.maxmem() - 5236;
var cmdbuf = []; // index: line number
var cmdbufMemFootPrint = 0;
var prompt = "Ok";
var lang = {};
lang.syntaxfehler = function(line) {
if (typeof line == "undefined")
return "Syntax error";
return "Syntax error in " + line;
};
function getUsedMemSize() {
return cmdbufMemFootPrint; // + array's dimsize * 8 + variables' sizeof literal + functions' expression length
}
var reLineNum = /^[0-9]+ +[^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_]+?)$/;
var reBin = /(0[Bb][01_]+)$/;
var reBool = /true|false/;
var reNum = /[0-9]+/;
var charsetNumMeta = /[.BbFfXx_]/;
var charsetOp = /[()\/|&,]+/;
var tbasexit = false;
println("Terran BASIC 1.0 "+vmemsize+" bytes free");
println(prompt);
var basicInterpreterStatus = {};
// variable object constructor
function BasicVar(linenum, literal, type) {
this.literal = literal;
this.type = type;
}
// DEFUN (GW-BASIC equiv. of DEF FN) constructor
function BasicFun(linenum, params, expression) {
this.params = params;
this.expression = expression;
}
// DIM (array) constructor
function BasicArr() {
var args = Array.from(arguments);
if (args.length == 1)
throw lang.syntaxfehler(args[0]);
else if (args.length == 0)
throw "InternalError: pass the line number!";
else {
// create nested array as defined
var dimsize = Number(args[1]);
var a = new Array(args[1]);
var internal = a;
for (var i = 2; i < args.length; i++) {
dimsize *= Number(args[i]);
var inner = new Array(args[i]);
internal.push(inner);
internal = inner;
}
this.array = a;
this.dimsize = dimsize;
}
}
// Abstract Syntax Tree
// creates empty tree node
function BasicAST() {
this.lnum = 0;
this.depth = 0;
this.leaves = [];
this.value = undefined;
this.type = "null"; // literal, operator, variable, function
this.toString = function() {
var sb = "";
var marker = ("literal" == this.type) ? ">" : ("operator" == this.type) ? "=" : "#";
sb += "| ".repeat(this.depth) + marker+" Line "+this.lnum+" ("+this.type+")\n";
sb += "| ".repeat(this.depth+1) + "leaves: "+(this.leaves.length)+"\n";
sb += "| ".repeat(this.depth+1) + "value: "+this.value+"\n";
for (var k = 0; k < this.leaves.length; k++) {
sb += this.leaves[k].toString(); + "\n";
}
sb += "| ".repeat(this.depth+1) + "----------------\n";
return sb;
};
}
basicInterpreterStatus.gosubStack = [];
basicInterpreterStatus.variables = {};
basicInterpreterStatus.defuns = {};
basicInterpreterStatus.builtin = {};
basicInterpreterStatus.builtin.print = function() {
var args = Array.from(arguments);
if (args.length == 0)
println();
else
println(args.join("\t"));
};
Object.freeze(basicInterpreterStatus.builtin);
var basicFunctions = {};
basicFunctions._isNumber = function(code) {
return (code >= 0x30 && code <= 0x39) || code == 0x2E;
};
basicFunctions._isParenOpen = function(code) {
return (code == 0x28 || code == 0x5B);
};
basicFunctions._isParenClose = function(code) {
return (code == 0x29 || code == 0x5D);
};
basicFunctions._isParen = function(code) {
return basicFunctions._isParenOpen(code) || basicFunctions._isParenClose(code);
};
basicFunctions._isSeparator = function(code) {
return code == 0x2C;
};
basicFunctions._isOperator = function(code) {
return (code == 0x21 || code == 0x23 || code == 0x25 || code == 0x2A || code == 0x2B || code == 0x2D || code == 0x2E || code == 0x2F || (code >= 0x3C && code <= 0x3E) || code == 0x5E || code == 0x7C);
};
basicFunctions._parseTokens = function(lnum, tokens, states, recDepth) {
// 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:
// VARIABLE = LITERAL
// VARIABLE = FUNCTION ARGUMENTS
// FUNCTION
// FUNCTION ARGUMENTS --arguments may contain another function call
// "FOR" VARIABLE "=" ARGUMENT "TO" ARGUMENT
// "FOR" VARIABLE "=" ARGUMENT "TO" ARGUMENT "STEP" ARGUMENT
// "IF" EXPRESSION "THEN" EXPRESSION
// "IF" EXPRESSION "THEN" EXPRESSION "ELSE" EXPRESSION
// "IF" EXPRESSION "GOTO" ARGUMENT
// "IF" EXPRESSION "GOTO" ARGUMENT "ELSE" EXPRESSION
// "WHILE" EXPRESSION
// additionally, sub-line also has one of these:
// LITERAL (leaf node)
// VARIABLE (leaf node)
// {VARIABLE, LITERAL} COMPARISON_OP {VARIABLE, LITERAL}
println("Parser Ln "+lnum+", Rec "+recDepth+", Tkn: "+tokens.join("/"));
if (tokens.length != states.length) throw "InternalError: size of tokens and states does not match (line: "+lnum+", recursion depth: "+recDepth+")";
if (tokens.length == 0) throw "InternalError: empty tokens (line: "+lnum+", recursion depth: "+recDepth+")";
var i, j, k;
var headWord = tokens[0].toLowerCase();
var treeHead = new BasicAST();
treeHead.depth = recDepth;
treeHead.lnum = lnum;
// IF statement
if ("IF" == tokens[0].toUpperCase()) {
throw "TODO";
}
// LEAF: is this a literal?
else if (recDepth > 0 && ("quote" == states[0] || "number" == states[0])) {
treeHead.value = tokens[0];
treeHead.type = "literal";
}
// is this a function?
else {
treeHead.value = headWord;
treeHead.type = "function";
// find and mark position of separators
// properly deal with the nested function calls
var separators = [];
var sepInit = (tokens.length > 1 && "paren" == states[1]) ? 2 : 1;
var parenCount = 1;
for (k = sepInit; k < tokens.length; k++) {
if ("(" == tokens[k]) parenCount += 1;
else if (")" == tokens[k]) parenCount -= 1;
if (parenCount == 1 && states[k] == "sep") separators.push(k);
if (parenCount < 0) throw lang.syntaxfehler(lnum);
}
separators.push(tokens.length - (sepInit == 1 ? 0 : 1));
println("sep ("+sepInit+")["+separators.join(",")+"]");
// parse and populate leaves
var leaves = [];
if (sepInit < separators[0]) {
for (k = 0; k < separators.length; k++) {
var subtkn = tokens.slice((k == 0) ? sepInit : separators[k - 1] + 1, separators[k]);
var substa = states.slice((k == 0) ? sepInit : separators[k - 1] + 1, separators[k]);
leaves.push(basicFunctions._parseTokens(lnum, subtkn, substa, recDepth + 1));
}
}
treeHead.leaves = leaves;
}
return treeHead;
};
// @returns: line number for the next command, normally (lnum + 1); if GOTO or GOSUB was met, returns its line number
basicFunctions._interpretLine = function(lnum, cmd) {
var _debugprintStateTransition = false;
var tokens = [];
var modes = [];
var sb = "";
var mode = "literal"; // literal, escape, number, quote, quote_end, operator, paren, sep, limbo
if (_debugprintStateTransition) println("Ln "+lnum+" cmd "+cmd);
// TOKENISE
// TODO add separator
for (var k = 0; k < cmd.length; k++) {
var char = cmd[k];
var charCode = cmd.charCodeAt(k);
if (_debugprintStateTransition) print("Char: "+char+"("+charCode+"), state: "+mode);
if ("literal" == mode) {
if (0x22 == charCode) { // "
tokens.push(sb); sb = ""; modes.push(mode);
mode = "quote";
}
/*else if (charCode == 0x5C) { // reverse solidus
tokens.push(sb); sb = "";
mode = "escape";
}*/
else if (basicFunctions._isOperator(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "operator";
}
else if (basicFunctions._isParen(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "paren";
}
else if (" " == char) {
tokens.push(sb); sb = ""; modes.push(mode);
mode = "limbo";
}
else if (basicFunctions._isSeparator(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "sep";
}
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 = "quote"; // ESCAPE is only legal when used inside of quote
}
else if ("quote" == mode) {
if (0x22 == charCode) {
tokens.push(sb); sb = ""; modes.push(mode);
mode = "quote_end";
}
else {
sb += char;
}
}
else if ("quote_end" == mode) {
if (basicFunctions._isNumber(charCode)) {
sb = "" + char;
mode = "number";
}
else if (" " == char) {
sb = "";
mode = "limbo";
}
else if (basicFunctions._isOperator(charCode)) {
sb = "" + char;
mode = "operator";
}
else if (0x22 == charCode) {
sb = "" + char;
mode = "quote";
}
else if (basicFunctions._isParen(charCode)) {
sb = "" + char;
mode = "paren";
}
else if (basicFunctions._isSeparator(charCode)) {
sb = "" + char;
mode = "sep";
}
else {
sb = "" + char;
mode = "literal";
}
}
else if ("number" == mode) {
if (basicFunctions._isNumber(charCode)) {
sb += char;
}
else if (" " == char) {
tokens.push(sb); sb = ""; modes.push(mode);
mode = "limbo";
}
else if (basicFunctions._isOperator(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "operator";
}
else if (0x22 == charCode) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "quote";
}
else if (basicFunctions._isParen(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "paren";
}
else if (basicFunctions._isSeparator(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "sep";
}
else {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "literal";
}
}
else if ("operator" == mode) {
if (basicFunctions._isOperator(charCode)) {
sb += char;
}
else if (basicFunctions._isNumber(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "number";
}
else if (" " == char) {
tokens.push(sb); sb = ""; modes.push(mode);
mode = "limbo";
}
else if (basicFunctions._isParen(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "paren";
}
else if (basicFunctions._isSeparator(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "sep";
}
else {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "literal";
}
}
else if ("limbo" == mode) {
if (char == " ") {
/* do nothing */
}
else if (basicFunctions._isNumber(charCode)) {
sb = "" + char;
mode = "number"
}
else if (basicFunctions._isOperator(charCode)) {
sb = "" + char;
mode = "operator"
}
else if (0x22 == charCode) {
sb = "";
mode = "quote"
}
else if (basicFunctions._isParen(charCode)) {
sb = "";
mode = "paren";
}
else if (basicFunctions._isSeparator(charCode)) {
sb = "";
mode = "sep";
}
else {
sb = "" + char;
mode = "literal";
}
}
else if ("paren" == mode) {
if (char == " ") {
tokens.push(sb); sb = ""; modes.push(mode);
mode = "limbo";
}
else if (basicFunctions._isNumber(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "number"
}
else if (basicFunctions._isOperator(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "operator"
}
else if (0x22 == charCode) {
tokens.push(sb); sb = ""; modes.push(mode);
mode = "quote"
}
else if (basicFunctions._isParen(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "paren";
}
else if (basicFunctions._isSeparator(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "sep";
}
else {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "literal";
}
}
else if ("sep" == mode) {
if (char == " ") {
tokens.push(sb); sb = ""; modes.push(mode);
mode = "limbo";
}
else if (basicFunctions._isNumber(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "number"
}
else if (basicFunctions._isOperator(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "operator"
}
else if (0x22 == charCode) {
tokens.push(sb); sb = ""; modes.push(mode);
mode = "quote"
}
else if (basicFunctions._isParen(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "paren";
}
else if (basicFunctions._isSeparator(charCode)) {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "sep";
}
else {
tokens.push(sb); sb = "" + char; modes.push(mode);
mode = "literal";
}
}
else {
throw "Unknown parser state: " + mode;
}
if (_debugprintStateTransition) println("->"+mode);
}
if (sb.length > 0) {
tokens.push(sb); modes.push(mode);
}
// END TOKENISE
// PARSING (SYNTAX ANALYSIS)
var syntaxTree = basicFunctions._parseTokens(lnum, tokens, modes, 0);
println("k bye");
serial.println(syntaxTree.toString());
// END PARSING
println(tokens.join("~"));
println(modes.join(" "));
return lnum + 1;
}; // end INTERPRETLINE
basicFunctions._basicList = function(v, i, arr) {
if (i < 10) print(" ");
if (i < 100) print(" ");
print(i);
print(" ");
println(v);
};
basicFunctions.list = function(args) { // LIST function
if (args.length == 1) {
cmdbuf.forEach(basicFunctions._basicList);
}
else if (args.length == 2) {
if (typeof cmdbuf[args[1]] != "undefined")
basicFunctions._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 (typeof cmd != "undefined") {
basicFunctions._basicList(cmd, i, cmdbuf);
}
}
}
};
basicFunctions.system = function(args) { // SYSTEM function
tbasexit = true;
};
basicFunctions.new = function(args) { // NEW function
cmdbuf = [];
};
basicFunctions.renum = function(args) { // RENUM function
var newcmdbuf = [];
var linenumRelation = [[]];
var cnt = 10;
for (var k = 0; k < cmdbuf.length; k++) {
if (typeof cmdbuf[k] != "undefined") {
newcmdbuf[cnt] = cmdbuf[k];
linenumRelation[k] = cnt;
cnt += 10;
}
}
// deal with goto/gosub line numbers
for (k = 0; k < newcmdbuf.length; k++) {
if (typeof newcmdbuf[k] != "undefined" && newcmdbuf[k].toLowerCase().startsWith("goto ")) {
newcmdbuf[k] = "goto " + linenumRelation[newcmdbuf[k].match(reNum)[0]];
}
else if (typeof 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(function(v, i, arr) {
cmdbufMemFootPrint += ("" + i).length + 1 + v.length;
});
};
basicFunctions.fre = function(args) {
println(vmemsize - getUsedMemSize());
};
basicFunctions.run = function(args) { // RUN function
var linenumber = 1;
var oldnum = 1;
do {
if (typeof cmdbuf[linenumber] != "undefined") {
oldnum = linenumber;
linenumber = basicFunctions._interpretLine(linenumber, cmdbuf[linenumber]);
}
else {
linenumber += 1;
}
if (con.hitterminate()) {
println("Break in "+oldnum);
break;
}
} while (linenumber < cmdbuf.length)
};
Object.freeze(basicFunctions);
while (!tbasexit) {
var line = sys.read();
line = line.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;
try {
var cmd = line.split(" ");
basicFunctions[cmd[0]](cmd);
}
catch (e) {
println(e);
println(lang.syntaxfehler());
}
println(prompt);
}
}
/*
digraph G {
start -> LITERAL
start -> LINENUMBER [label="reDec"]
LINENUMBER -> LINENUMBER [label="numbers"]
LINENUMBER -> limbo [label="space"]
LINENUMBER -> LITERAL [label="otherwise"]
LITERAL -> limbo [label="space"]
LITERAL -> OPERATOR [label="reOps"]
LITERAL -> ESCAPE [label="\\"]
LITERAL -> QUOTE [label="\""]
LITERAL -> PAREN [label="()[]"]
LITERAL -> SEP [label=","]
LITERAL -> LITERAL [label="otherwise"]
limbo -> NUMBER [label="numbers"]
limbo -> OPERATOR [label="reOps"]
limbo -> QUOTE [label="\""]
limbo -> LITERAL [label="otherwise"]
limbo -> PAREN [label="()[]"]
limbo -> SEP [label=","]
limbo -> limbo [label="space"]
ESCAPE -> LITERAL
QUOTE -> QUOTE_END [label="\""]
QUOTE -> QUOTE [label="otherwise"]
QUOTE_END -> limbo [label="space"]
QUOTE_END -> NUMBER [label="numbers"]
QUOTE_END -> OPERATOR [label="reOps"]
QUOTE_END -> PAREN [label="()[]"]
QUOTE_END -> SEP [label=","]
QUOTE_END -> LITERAL [label="otherwise"]
OPERATOR -> NUMBER [label="numbers"]
OPERATOR -> limbo [label="space"]
OPERATOR -> OPERATOR [label="reOps"]
OPERATOR -> PAREN [label="()[]"]
OPERATOR -> SEP [label=","]
OPERATOR -> LITERAL [label="otherwise"]
NUMBER -> NUMBER [label="numbers"]
NUMBER -> OPERATOR [label="reOps"]
NUMBER -> QUOTE [label="\""]
NUMBER -> limbo [label="space"]
NUMBER -> PAREN [label="()[]"]
NUMBER -> SEP [label=","]
NUMBER -> LITERAL [label="otherwise"]
PAREN -> PUSH_AND_PAREN [label="()[]"]
PAREN -> NUMBER [label="numbers"]
PAREN -> OPERATOR [label="reOps"]
PAREN -> QUOTE [label="\""]
PAREN -> limbo [label="space"]
PAREN -> SEP [label=","]
PAREN -> LITERAL [label="otherwise"]
SEP -> PAREN [label="()[]"]
SEP -> NUMBER [label="numbers"]
SEP -> OPERATOR [label="reOps"]
SEP -> QUOTE [label="\""]
SEP -> limbo [label="space"]
SEP -> PUSH_AND_SEP [label=","]
SEP -> LITERAL [label="otherwise"]
LITERAL -> end [label="\\n"]
NUMBER -> end [label="\\n"]
QUOTE_END -> end [label="\\n"]
OPERATOR -> end [label="\\n"]
PAREN -> end [label="\\n"]
start [shape=Mdiamond];
end [shape=Msquare];
concentrate=true;
}
*/
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