Files
tsvm/assets/disk0/tbas/parser_wip.js
2020-12-24 11:14:11 +09:00

849 lines
32 KiB
JavaScript

class ParserError extends Error {
constructor(...args) {
super(...args);
Error.captureStackTrace(this, ParserError);
}
}
var DEFUNS_BUILD_DEFUNS = false;
let bF = {};
bF.parserPrintdbg = any => serial.println(any);
bF.parserPrintdbg2 = function(icon, lnum, tokens, states, recDepth) {
let treeHead = String.fromCharCode(0x2502,32).repeat(recDepth);
bF.parserPrintdbg(`${icon}${lnum} ${treeHead}${tokens.join(' ')}`);
bF.parserPrintdbg(`${icon}${lnum} ${treeHead}${states.join(' ')}`);
}
bF.parserPrintdbgline = function(icon, msg, lnum, recDepth) {
let treeHead = String.fromCharCode(0x2502,32).repeat(recDepth);
bF.parserPrintdbg(`${icon}${lnum} ${treeHead}${msg}`);
}
let lang = {};
lang.syntaxfehler = function(line, reason) {
return Error("Syntax error" + ((line !== undefined) ? (" in "+line) : "") + ((reason !== undefined) ? (": "+reason) : ""));
};
/**
* @return ARRAY of BasicAST
*/
bF._parseTokens = function(lnum, tokens, states) {
bF.parserPrintdbg2('Line ', lnum, tokens, states, 0);
if (tokens.length !== states.length) throw lang.syntaxfehler(lnum);
if (tokens[0].toUpperCase() == "REM" && states[0] != "qot") return;
/*************************************************************************/
let parenDepth = 0;
let parenStart = -1;
let parenEnd = -1;
let seps = [];
// scan for parens and (:)s
for (let k = 0; k < tokens.length; k++) {
// increase paren depth and mark paren start position
if (tokens[k] == "(" && states[k] != "qot") {
parenDepth += 1;
if (parenStart == -1 && parenDepth == 1) parenStart = k;
}
// decrease paren depth
else if (tokens[k] == ")" && states[k] != "qot") {
if (parenEnd == -1 && parenDepth == 1) parenEnd = k;
parenDepth -= 1;
}
if (parenDepth == 0 && tokens[k] == ":" && states[k] == "seq")
seps.push(k);
}
let startPos = [0].concat(seps.map(k => k+1));
let stmtPos = startPos.map((s,i) => {return{start:s, end:(seps[i] || tokens.length)}}); // use end of token position as separator position
return stmtPos.map((x,i) => {
if (stmtPos.length > 1)
bF.parserPrintdbgline('Line ', 'Statement #'+(i+1), lnum, 0);
// check for empty tokens
if (x.end - x.start <= 0) throw new ParserError("Malformed Line");
let tree = bF._parseStmt(lnum,
tokens.slice(x.start, x.end),
states.slice(x.start, x.end),
1
);
bF.parserPrintdbgline('Tree in ', '\n'+astToString(tree), lnum, 0);
return tree;
});
}
/** Parses following EBNF rule:
stmt =
"REM" , ? anything ?
| "IF" , expr_sans_asgn , "THEN" , stmt , ["ELSE" , stmt]
| "DEFUN" , [ident] , "(" , [ident , {" , " , ident}] , ")" , "=" , expr
| "ON" , expr_sans_asgn , ident , expr_sans_asgn , {"," , expr_sans_asgn}
| "(" , stmt , ")"
| expr ; (* if the statement is 'lit' and contains only one word, treat it as function_call e.g. NEXT for FOR loop *)
* @return: BasicAST
*/
bF._parseStmt = function(lnum, tokens, states, recDepth) {
bF.parserPrintdbg2('$', lnum, tokens, states, recDepth);
/*************************************************************************/
// case for: single word (e.g. NEXT for FOR loop)
if (tokens.length == 1 && states.length == 1) {
bF.parserPrintdbgline('$', "Single Word Function Call", lnum, recDepth);
return bF._parseLit(lnum, tokens, states, recDepth + 1, true);
}
/*************************************************************************/
let headTkn = tokens[0].toUpperCase();
let headSta = states[0];
let treeHead = new BasicAST();
treeHead.astLnum = lnum;
/*************************************************************************/
// case for: "REM" , ? anything ?
if (headTkn == "REM" && headSta != "qot") return;
/*************************************************************************/
let parenDepth = 0;
let parenStart = -1;
let parenEnd = -1;
let onGoPos = -1;
let sepsZero = [];
let sepsOne = [];
// scan for parens that will be used for several rules
// also find nearest THEN and ELSE but also take parens into account
for (let k = 0; k < tokens.length; k++) {
// increase paren depth and mark paren start position
if (tokens[k] == "(" && states[k] != "qot") {
parenDepth += 1;
if (parenStart == -1 && parenDepth == 1) parenStart = k;
}
// decrease paren depth
else if (tokens[k] == ")" && states[k] != "qot") {
if (parenEnd == -1 && parenDepth == 1) parenEnd = k;
parenDepth -= 1;
}
if (parenDepth == 0 && states[k] == "sep")
sepsZero.push(k);
if (parenDepth == 1 && states[k] == "sep")
sepsOne.push(k);
if (parenDepth == 0) {
let tok = tokens[k].toUpperCase();
if (-1 == onGoPos && ("GOTO" == tok || "GOSUB" == tok) && "lit" == states[k])
onGoPos = k;
}
}
// unmatched brackets, duh!
if (parenDepth != 0) throw lang.syntaxfehler(lnum, lang.unmatchedBrackets);
/*************************************************************************/
// ## case for:
// "IF" , expr_sans_asgn , "THEN" , stmt , ["ELSE" , stmt]
try {
bF.parserPrintdbgline('$', "Trying IF Statement...", lnum, recDepth);
return bF._parseIfMode(lnum, tokens, states, recDepth + 1, false);
}
// if ParserError is raised, continue to apply other rules
catch (e) {
bF.parserPrintdbgline('$', 'It was NOT!', lnum, recDepth);
if (!(e instanceof ParserError)) throw e;
}
/*************************************************************************/
// ## case for:
// | "DEFUN" , [ident] , "(" , [ident , {" , " , ident}] , ")" , "=" , expr
if ("DEFUN" == headTkn && "lit" == headSta &&
parenStart == 2 && tokens[parenEnd + 1] == "=" && states[parenEnd + 1] == "op"
) {
bF.parserPrintdbgline('$', 'DEFUN Stmt', lnum, recDepth);
treeHead.astValue = "DEFUN";
treeHead.astType = "function";
// parse function name
if (tokens[1] == "(") {
// anonymous function
treeHead.astLeaves[0] = new BasicAST();
treeHead.astLeaves[0].astLnum = lnum;
treeHead.astLeaves[0].astType = "lit";
}
else {
bF.parserPrintdbgline('$', 'DEFUN Stmt Function Name:', lnum, recDepth);
treeHead.astLeaves[0] = bF._parseIdent(lnum, [tokens[1]], [states[1]], recDepth + 1);
}
// parse function arguments
bF.parserPrintdbgline('$', 'DEFUN Stmt Function Arguments -- ', lnum, recDepth);
let defunArgDeclSeps = sepsOne.filter((i) => i < parenEnd + 1).map(i => i-1).concat([parenEnd - 1]);
bF.parserPrintdbgline('$', 'DEFUN Stmt Function Arguments comma position: '+defunArgDeclSeps, lnum, recDepth);
treeHead.astLeaves[0].astLeaves = defunArgDeclSeps.map(i=>bF._parseIdent(lnum, [tokens[i]], [states[i]], recDepth + 1));
// parse function body
let parseFunction = (DEFUNS_BUILD_DEFUNS) ? bF._parseStmt : bF._parseExpr;
treeHead.astLeaves[1] = parseFunction(lnum,
tokens.slice(parenEnd + 2, tokens.length),
states.slice(parenEnd + 2, states.length),
recDepth + 1
);
return treeHead;
}
/*************************************************************************/
// ## case for:
// | "ON" , if_equation , ident , if_equation , {"," , if_equation}
if ("ON" == headTkn && "lit" == headSta) {
bF.parserPrintdbgline('$', 'ON Stmt', lnum, recDepth);
if (onGoPos == -1) throw ParserError("Malformed ON Statement");
treeHead.astValue = "ON";
treeHead.astType = "function";
// parse testvalue
let testvalue = bF._parseExpr(lnum,
tokens.slice(1, onGoPos),
states.slice(1, onGoPos),
recDepth + 1,
true
);
// parse functionname
let functionname = bF._parseExpr(lnum,
[tokens[onGoPos]],
[states[onGoPos]],
recDepth + 1,
true
);
// parse arguments
// get list of comma but filter ones appear before GOTO/GOSUB
let onArgSeps = sepsZero.filter(i => (i > onGoPos));
let onArgStartPos = [onGoPos + 1].concat(onArgSeps.map(k => k + 1));
let onArgPos = onArgStartPos.map((s,i) => {return{start:s, end: (onArgSeps[i] || tokens.length)}}); // use end of token position as separator position
// recursively parse expressions
treeHead.astLeaves = [testvalue, functionname].concat(onArgPos.map((x,i) => {
bF.parserPrintdbgline('$', 'ON GOTO/GOSUB Arguments #'+(i+1), lnum, recDepth);
// check for empty tokens
if (x.end - x.start <= 0) throw new ParserError("Malformed ON arguments");
return bF._parseExpr(lnum,
tokens.slice(x.start, x.end),
states.slice(x.start, x.end),
recDepth + 1,
true
);
}));
return treeHead;
}
/*************************************************************************/
// ## case for:
// | "(" , stmt , ")"
if (parenStart == 0 && parenEnd == tokens.length - 1) {
bF.parserPrintdbgline('$', '( Stmt )', lnum, recDepth);
return bF._parseStmt(lnum,
tokens.slice(parenStart + 1, parenEnd),
states.slice(parenStart + 1, parenEnd),
recDepth + 1
);
}
/*************************************************************************/
// ## case for:
// | expr ;
try {
bF.parserPrintdbgline('$', 'Trying Expression Call...', lnum, recDepth);
return bF._parseExpr(lnum, tokens, states, recDepth + 1);
}
catch (e) {
bF.parserPrintdbgline('$', 'Error!', lnum, recDepth);
throw new ParserError("Statement cannot be parsed in "+lnum+": "+e.stack);
}
/*************************************************************************/
throw new ParserError("Statement cannot be parsed in "+lnum);
} // END of STMT
/** Parses following EBNF rule:
expr = (* this basically blocks some funny attemps such as using DEFUN as anon function because everything is global in BASIC *)
lit
| "(" , expr , ")"
| "IF" , expr_sans_asgn , "THEN" , expr , ["ELSE" , expr]
| kywd , expr (* also deals with FOR statement; kywd = ? words that exists on the list of predefined function that are not operators ? ; *)
| function_call
| expr , op , expr
| op_uni , expr ;
* @return: BasicAST
*/
bF._parseExpr = function(lnum, tokens, states, recDepth, ifMode) {
bF.parserPrintdbg2('E', lnum, tokens, states, recDepth);
/*************************************************************************/
// ## special case for virtual dummy element (e.g. phantom element on "PRINT SPC(20);")
if (tokens[0] === undefined && states[0] === undefined) {
let treeHead = new BasicAST();
treeHead.astLnum = lnum;
treeHead.astValue = undefined;
treeHead.astType = "null";
return treeHead;
}
/*************************************************************************/
let headTkn = tokens[0].toUpperCase();
let headSta = states[0];
/*************************************************************************/
// ## case for:
// lit
if (!bF._EquationIllegalTokens.includes(headTkn) && tokens.length == 1) {
bF.parserPrintdbgline('E', 'Literal Call', lnum, recDepth);
return bF._parseLit(lnum, tokens, states, recDepth + 1);
}
/*************************************************************************/
// scan for operators with highest precedence, use rightmost one if multiple were found
let topmostOp;
let topmostOpPrc = 0;
let operatorPos = -1;
// find and mark position of parentheses
// properly deal with the nested function calls
let parenDepth = 0;
let parenStart = -1;
let parenEnd = -1;
// Scan for unmatched parens and mark off the right operator we must deal with
// every function_call need to re-scan because it is recursively called
for (let k = 0; k < tokens.length; k++) {
// increase paren depth and mark paren start position
if (tokens[k] == "(" && states[k] != "qot") {
parenDepth += 1;
if (parenStart == -1 && parenDepth == 1) parenStart = k;
}
// decrease paren depth
else if (tokens[k] == ")" && states[k] != "qot") {
if (parenEnd == -1 && parenDepth == 1) parenEnd = k;
parenDepth -= 1;
}
// determine the right operator to deal with
if (parenDepth == 0) {
if (states[k] == "op" && bF.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;
}
}
}
// unmatched brackets, duh!
if (parenDepth != 0) throw lang.syntaxfehler(lnum, lang.unmatchedBrackets);
/*************************************************************************/
// ## case for:
// | "(" , expr , ")"
if (parenStart == 0 && parenEnd == tokens.length - 1) {
bF.parserPrintdbgline('E', '( Expr )', lnum, recDepth);
return bF._parseExpr(lnum,
tokens.slice(parenStart + 1, parenEnd),
states.slice(parenStart + 1, parenEnd),
recDepth + 1
);
}
/*************************************************************************/
// ## case for:
// | "IF" , expr_sans_asgn , "THEN" , expr , ["ELSE" , expr]
try {
bF.parserPrintdbgline('E', "Trying IF Expression...", lnum, recDepth);
return bF._parseIfMode(lnum, tokens, states, recDepth + 1, false);
}
// if ParserError is raised, continue to apply other rules
catch (e) {
bF.parserPrintdbgline('E', 'It was NOT!', lnum, recDepth);
if (!(e instanceof ParserError)) throw e;
}
/*************************************************************************/
// ## case for:
// | kywd , expr (* kywd = ? words that exists on the list of predefined function that are not operators ? ; *)
if (bStatus.builtin[headTkn] && headSta == "lit" && !bF._opPrc[headTkn] &&
states[1] != "paren"
) {
bF.parserPrintdbgline('E', 'Builtin Function Call w/o Paren', lnum, recDepth);
return bF._parseFunctionCall(lnum, tokens, states, recDepth + 1);
}
/*************************************************************************/
// ## case for:
// (* at this point, if OP is found in paren-level 0, skip function_call *)
// | function_call ;
if (topmostOp === undefined) { // don't remove this IF statement!
try {
bF.parserPrintdbgline('E', "Trying Function Call...", lnum, recDepth);
return bF._parseFunctionCall(lnum, tokens, states, recDepth + 1);
}
// if ParserError is raised, continue to apply other rules
catch (e) {
bF.parserPrintdbgline('E', 'It was NOT!', lnum, recDepth);
if (!(e instanceof ParserError)) throw e;
}
}
/*************************************************************************/
// ## case for:
// | expr , op, expr
// | op_uni , expr
// if operator is found, split by the operator and recursively parse the LH and RH
if (topmostOp !== undefined) {
bF.parserPrintdbgline('E', 'Operators', lnum, recDepth);
if (ifMode && topmostOp == "=") throw lang.syntaxfehler(lnum, "'=' used on IF, did you mean '=='?");
if (ifMode && topmostOp == ":") throw lang.syntaxfehler(lnum, "':' used on IF");
// this is the AST we're going to build up and return
// (other IF clauses don't use this)
let treeHead = new BasicAST();
treeHead.astLnum = lnum;
treeHead.astValue = topmostOp;
treeHead.astType = "op";
// BINARY_OP?
if (operatorPos > 0) {
let subtknL = tokens.slice(0, operatorPos);
let substaL = states.slice(0, operatorPos);
let subtknR = tokens.slice(operatorPos + 1, tokens.length);
let substaR = states.slice(operatorPos + 1, tokens.length);
treeHead.astLeaves[0] = bF._parseExpr(lnum, subtknL, substaL, recDepth + 1);
treeHead.astLeaves[1] = bF._parseExpr(lnum, subtknR, substaR, recDepth + 1);
}
else {
if (topmostOp === "-") treeHead.astValue = "UNARYMINUS"
else if (topmostOp === "+") treeHead.astValue = "UNARYPLUS"
else if (topmostOp === "NOT") treeHead.astValue = "UNARYLOGICNOT"
else if (topmostOp === "BNOT") treeHead.astValue = "UNARYBNOT"
else throw new ParserError(`Unknown unary op '${topmostOp}'`)
treeHead.astLeaves[0] = bF._parseExpr(lnum,
tokens.slice(operatorPos + 1, tokens.length),
states.slice(operatorPos + 1, states.length),
recDepth + 1
);
}
return treeHead;
}
/*************************************************************************/
throw new ParserError("Expression cannot be parsed in "+lnum);
} // END of EXPR
/** Parses following EBNF rule:
"IF" , expr_sans_asgn , "THEN" , stmt , ["ELSE" , stmt]
| "IF" , expr_sans_asgn , "THEN" , expr , ["ELSE" , expr]
if exprMode is true, only the latter will be used; former otherwise
* @return: BasicAST
*/
bF._parseIfMode = function(lnum, tokens, states, recDepth, exprMode) {
bF.parserPrintdbg2('/', lnum, tokens, states, recDepth);
/*************************************************************************/
let headTkn = tokens[0].toUpperCase();
let headSta = states[0];
let parseFunction = (exprMode) ? bF._parseExpr : bF._parseStmt
let thenPos = -1;
let elsePos = -1;
let parenDepth = 0;
let parenStart = -1;
let parenEnd = -1;
// scan for parens that will be used for several rules
// also find nearest THEN and ELSE but also take parens into account
for (let k = 0; k < tokens.length; k++) {
// increase paren depth and mark paren start position
if (tokens[k] == "(" && states[k] != "qot") {
parenDepth += 1;
if (parenStart == -1 && parenDepth == 1) parenStart = k;
}
// decrease paren depth
else if (tokens[k] == ")" && states[k] != "qot") {
if (parenEnd == -1 && parenDepth == 1) parenEnd = k;
parenDepth -= 1;
}
if (parenDepth == 0) {
if (-1 == thenPos && "THEN" == tokens[k].toUpperCase() && "lit" == states[k])
thenPos = k;
else if (-1 == elsePos && "ELSE" == tokens[k].toUpperCase() && "lit" == states[k])
elsePos = k;
}
}
// unmatched brackets, duh!
if (parenDepth != 0) throw lang.syntaxfehler(lnum, lang.unmatchedBrackets);
let treeHead = new BasicAST();
treeHead.astLnum = lnum;
// ## case for:
// "IF" , expr_sans_asgn , "THEN" , stmt , ["ELSE" , stmt]
if ("IF" == headTkn && "lit" == headSta) {
// "THEN" not found, raise error!
if (thenPos == -1) throw lang.syntaxfehler(lnum, "IF without THEN");
treeHead.astValue = "IF";
treeHead.astType = "function";
treeHead.astLeaves[0] = bF._parseExpr(lnum,
tokens.slice(1, thenPos),
states.slice(1, thenPos),
recDepth + 1,
true // if_equation mode
);
treeHead.astLeaves[1] = parseFunction(lnum,
tokens.slice(thenPos + 1, (elsePos != -1) ? elsePos : tokens.length),
states.slice(thenPos + 1, (elsePos != -1) ? elsePos : tokens.length),
recDepth + 1
);
if (elsePos != -1)
treeHead.astLeaves[2] = parseFunction(lnum,
tokens.slice(elsePos + 1, tokens.length),
states.slice(elsePos + 1, tokens.length),
recDepth + 1
);
return treeHead;
}
throw new ParserError("not an IF "+(exprMode) ? "expression" : "statement");
} // END of IF
/** Parses following EBNF rule:
function_call =
ident , "(" , [expr , {argsep , expr} , [argsep]] , ")"
| ident , expr , {argsep , expr} , [argsep] ;
* @return: BasicAST
*/
bF._parseFunctionCall = function(lnum, tokens, states, recDepth) {
bF.parserPrintdbg2(String.fromCharCode(0x192), lnum, tokens, states, recDepth);
/*************************************************************************/
let parenDepth = 0;
let parenStart = -1;
let parenEnd = -1;
let _argsepsOnLevelZero = []; // argseps collected when parenDepth == 0
let _argsepsOnLevelOne = []; // argseps collected when parenDepth == 1
// Scan for unmatched parens and mark off the right operator we must deal with
// every function_call need to re-scan because it is recursively called
for (let k = 0; k < tokens.length; k++) {
// increase paren depth and mark paren start position
if (tokens[k] == "(" && states[k] != "qot") {
parenDepth += 1;
if (parenStart == -1 && parenDepth == 1) parenStart = k;
}
// decrease paren depth
else if (tokens[k] == ")" && states[k] != "qot") {
if (parenEnd == -1 && parenDepth == 1) parenEnd = k;
parenDepth -= 1;
}
if (parenDepth == 0 && states[k] == "sep")
_argsepsOnLevelZero.push(k);
if (parenDepth == 1 && states[k] == "sep")
_argsepsOnLevelOne.push(k);
}
// unmatched brackets, duh!
if (parenDepth != 0) throw lang.syntaxfehler(lnum, lang.unmatchedBrackets);
let parenUsed = (parenStart == 1);
// && parenEnd == tokens.length - 1);
// if starting paren is found, just use it
// this prevents "RND(~~)*K" to be parsed as [RND, (~~)*K]
/*************************************************************************/
// ## case for:
// ident , "(" , [expr , {argsep , expr} , [argsep]] , ")"
// | ident , expr , {argsep , expr} , [argsep] ;
bF.parserPrintdbgline(String.fromCharCode(0x192), `Function Call (parenUsed: ${parenUsed})`, lnum, recDepth);
let treeHead = new BasicAST();
treeHead.astLnum = lnum;
// set function name and also check for syntax by deliberately parsing the word
treeHead.astValue = bF._parseIdent(lnum, [tokens[0]], [states[0]], recDepth + 1).astValue; // always UPPERCASE
// 5 8 11 [end]
let argSeps = parenUsed ? _argsepsOnLevelOne : _argsepsOnLevelZero; // choose which "sep tray" to use
bF.parserPrintdbgline(String.fromCharCode(0x192), "argSeps = "+argSeps, lnum, recDepth);
// 1 6 9 12
let argStartPos = [1 + (parenUsed)].concat(argSeps.map(k => k+1));
bF.parserPrintdbgline(String.fromCharCode(0x192), "argStartPos = "+argStartPos, lnum, recDepth);
// [1,5) [6,8) [9,11) [12,end)
let argPos = argStartPos.map((s,i) => {return{start:s, end:(argSeps[i] || (parenUsed ? parenEnd : tokens.length) )}}); // use end of token position as separator position
bF.parserPrintdbgline(String.fromCharCode(0x192), "argPos = "+argPos.map(it=>`${it.start}/${it.end}`), lnum, recDepth);
// check for trailing separator
// recursively parse function arguments
treeHead.astLeaves = argPos.map((x,i) => {
bF.parserPrintdbgline(String.fromCharCode(0x192), 'Function Arguments #'+(i+1), lnum, recDepth);
// check for empty tokens
if (x.end - x.start < 0) throw new ParserError("not a function call because it's malformed");
return bF._parseExpr(lnum,
tokens.slice(x.start, x.end),
states.slice(x.start, x.end),
recDepth + 1
)}
);
treeHead.astType = "function";
treeHead.astSeps = argSeps.map(i => tokens[i]);
bF.parserPrintdbgline(String.fromCharCode(0x192), "astSeps = "+treeHead.astSeps, lnum, recDepth);
return treeHead;
}
bF._parseIdent = function(lnum, tokens, states, recDepth) {
bF.parserPrintdbg2('i', lnum, tokens, states, recDepth);
if (!Array.isArray(tokens) && !Array.isArray(states)) throw new ParserError("Tokens and states are not array");
if (tokens.length != 1 || states[0] != "lit") throw new ParserError(`illegal tokens '${tokens}' with states '${states}' in ${lnum}`);
let treeHead = new BasicAST();
treeHead.astLnum = lnum;
treeHead.astValue = tokens[0].toUpperCase();
treeHead.astType = "lit";
return treeHead;
}
/**
* @return: BasicAST
*/
bF._parseLit = function(lnum, tokens, states, recDepth, functionMode) {
bF.parserPrintdbg2(String.fromCharCode(0xA2), lnum, tokens, states, recDepth);
if (!Array.isArray(tokens) && !Array.isArray(states)) throw new ParserError("Tokens and states are not array");
if (tokens.length != 1) throw new ParserError("parseLit 1");
let treeHead = new BasicAST();
treeHead.astLnum = lnum;
treeHead.astValue = ("qot" == states[0]) ? tokens[0] : tokens[0].toUpperCase();
treeHead.astType = ("qot" == states[0]) ? "string" :
("num" == states[0]) ? "num" :
(functionMode) ? "function" : "lit";
return treeHead;
}
bF._EquationIllegalTokens = ["IF","THEN","ELSE","DEFUN","ON"];
bF.isSemanticLiteral = function(token, state) {
return undefined == token || "]" == token || ")" == token ||
"qot" == state || "num" == state || "bool" == state || "lit" == state;
}
/////// TEST/////////
let astToString = function(ast, depth) {
let l__ = String.fromCharCode(0x2502,32);
let recDepth = depth || 0;
if (ast === undefined || ast.astType === undefined) return "";
var sb = "";
var marker = ("lit" == ast.astType) ? "i" :
("op" == ast.astType) ? String.fromCharCode(0xB1) :
("string" == ast.astType) ? String.fromCharCode(0xB6) :
("num" == ast.astType) ? String.fromCharCode(0xA2) :
("array" == ast.astType) ? "[" :
("defun_args" === ast.astType) ? String.fromCharCode(0x3B4) : String.fromCharCode(0x192);
sb += l__.repeat(recDepth) + marker+" Line "+ast.astLnum+" ("+ast.astType+")\n";
sb += l__.repeat(recDepth+1) + "leaves: "+(ast.astLeaves.length)+"\n";
sb += l__.repeat(recDepth+1) + "value: "+ast.astValue+" (type: "+typeof ast.astValue+")\n";
for (var k = 0; k < ast.astLeaves.length; k++) {
sb += astToString(ast.astLeaves[k], recDepth + 1);
sb += l__.repeat(recDepth+1) + " " + ast.astSeps[k] + "\n";
}
sb += l__.repeat(recDepth)+String.fromCharCode(0x2570)+String.fromCharCode(0x2500).repeat(13)+'\n';
return sb;
}
let BasicAST = function() {
this.astLnum = 0;
this.astLeaves = [];
this.astSeps = [];
this.astValue = undefined;
this.astType = "null"; // lit, op, string, num, array, function, null, defun_args (! NOT usrdefun !)
}
bF._opPrc = {
// function call in itself has highest precedence
"^":1,
"*":2,"/":2,"\\":2,
"MOD":3,
"+":4,"-":4,
"NOT":5,"BNOT":5,
"<<":6,">>":6,
"<":7,">":7,"<=":7,"=<":7,">=":7,"=>":7,
"==":8,"<>":8,"><":8,
"MIN":10,"MAX":10,
"BAND":20,
"BXOR":21,
"BOR":22,
"AND":30,
"OR":31,
"TO":40,
"STEP":41,
"!":50,"~":51, // array CONS and PUSH
"#": 52, // array concat
"<~": 100, // curry operator
"~>": 101, // closure operator
"=":999,
"IN":1000
};
bF._opRh = {"^":1,"=":1,"!":1,"IN":1,"<~":1,"~>":1};
let bStatus = {};
bStatus.builtin = {};
["PRINT","NEXT","SPC","CHR","ROUND","SQR","RND","GOTO","GOSUB","DEFUN","FOR","MAP"].forEach(w=>{ bStatus.builtin[w] = 1 });
let lnum = 10;
// if s<2 then (nop1) else (if s < 9999 then nop2 else nop3)
let tokens1 = ["if","s","<","2","then","(","nop1",")","else","(","if","s","<","9999","then","nop2","else","nop3",")"];
let states1 = ["lit","lit","op","num","lit","paren","lit","paren","lit","paren","lit","lit","op","num","lit","lit","lit","lit","paren"];
// DEFUN HYPOT(X,Y) = SQR(X*X+Y*Y)
let tokens2 = ["defun","HYPOT","(","X",",","Y",")","=","SQR","(","X","*","X","+","Y","*","Y",")"];
let states2 = ["lit","lit","paren","lit","sep","lit","paren","op","lit","paren","lit","op","lit","op","lit","op","lit","paren"];
// DEFUN SINC(X) = SIN(X) / X
let tokens3 = ["DEFUN","SINC","(","X",")","=","SIN","(","X",")","/","X"];
let states3 = ["lit","lit","paren","lit","paren","op","lit","paren","lit","paren","op","lit"];
// PRINT(IF S<2 THEN "111" ELSE IF S<3 THEN "222" ELSE "333")
let tokens4 = ["PRINT","(","IF","S","<","2","THEN","111","ELSE","IF","S","<","3","THEN","222","ELSE","333",")"];
let states4 = ["lit","paren","lit","lit","op","lit","lit","qot","lit","lit","lit","op","lit","lit","qot","lit","qot","paren"];
// ON 6*SQR(X-3) GOTO X+1, X+2, X+3
let tokens5 = ["ON","6","*","SQR","(","X","-","3",")","GOTO","X","+","1",",","X","+","2",",","X","+","3"];
let states5 = ["lit","num","op","lit","paren","lit","op","num","paren","lit","lit","op","num","sep","lit","op","num","sep","lit","op","num"];
// FOR K=10 TO 1 STEP -1
let tokens6 = ["FOR","K","=","10","TO","1","STEP","-","1"];
let states6 = ["lit","lit","op","num","op","num","op","op","num"];
// print(chr(47+round(rnd(1))*45);)
let tokens7 = ["PRINT","(","CHR","(","47","+","ROUND","(","RND","(","1",")",")","*","45",")",";",")"];
let states7 = ["lit","paren","lit","paren","num","op","lit","paren","lit","paren","num","paren","paren","op","num","paren","sep","paren"];
// PRINT 4 - 5 * 9
let tokens8 = ["PRINT","4","-","5","*","9"];
let states8 = ["lit","num","op","num","op","num"];
// NEXT
let tokens9 = ["NEXT"];
let states9 = ["lit"];
// PRINT -3
let tokens10 = ["PRINT","-","3"];
let states10 = ["lit","op","num"];
// PRINT SPC(20-I);
let tokens11 = ["PRINT","SPC","(","20","-","I",")",";"];
let states11 = ["lit","lit","paren","num","op","lit","paren","sep"];
// DEFUN FAC(N)=IF N==0 THEN 1 ELSE N*FAC(N-1)
let tokens12 = ["DEFUN","FAC","(","N",")","=","IF","N","==","0","THEN","1","ELSE","N","*","FAC","(","N","-","1",")"];
let states12 = ["lit","lit","paren","lit","paren","op","lit","lit","op","num","lit","num","lit","lit","op","lit","paren","lit","op","num","paren"];
// K = MAP FAC , 1 TO 10
let tokens13 = ["K","=","MAP","FAC",",","1","TO","10"];
let states13 = ["lit","op","lit","lit","sep","num","op","num"];
// DEFUN FIB(N)=IF N==0 THEN 0 ELSE IF N==1 THEN 1 ELSE FIB(N-1)+FIB(N-2)
let tokens14 = ["DEFUN","FIB","(","N",")","=","IF","N","==","0","THEN","0",
"ELSE","IF","N","==","1","THEN","1",
"ELSE","FIB","(","N","-","1",")","+","FIB","(","N","-","2",")"];
let states14 = ["lit","lit","paren","lit","paren","op","lit","lit","op","num","lit","num",
"lit","lit","lit","op","num","lit","num",
"lit","lit","paren","lit","op","num","paren","op","lit","paren","lit","op","num","paren"];
// PRINT(MAP FIB, 1 TO 10) is not broken, it's obvious syntax error
// use "PRINT MAP(FIB, 1 TO 10)" instead
let tokens15 = ["PRINT","MAP","(","FIB",",","1","TO","10",")"];
let states15 = ["lit","lit","paren","lit","sep","num","op","num","paren"];
// DEFUN KA(X)=IF X>2 THEN DO(PRINT(HAI);PRINT(X)) ELSE DO(PRINT(BYE);PRINT(X))
let tokens16 = ["DEFUN","KA","(","X",")","=","IF","X",">","2","THEN","DO","(","PRINT","(","HAI",")",";","PRINT","(","X",")",")","ELSE","DO","(","PRINT","(","BYE",")",";","PRINT","(","X",")",")"];
let states16 = ["lit","lit","paren","lit","paren","op","lit","lit","op","num","lit","lit","paren","lit","paren","qot","paren","sep","lit","paren","lit","paren","paren","lit","lit","paren","lit","paren","qot","paren","sep","lit","paren","lit","paren","paren"];
// FILTER(FN<~HEAD XS, TAIL XS)
let tokens17 = ["FILTER","(","FN","<~","HEAD","XS",",","TAIL","XS",")"];
let states17 = ["lit","paren","lit","op","lit","lit","sep","lit","lit","paren"];
try {
let trees = bF._parseTokens(lnum,
tokens17,
states17
);
trees.forEach((t,i) => {
serial.println("\nParsed Statement #"+(i+1));
serial.println(astToString(t));
});
}
catch (e) {
serial.printerr(e);
serial.printerr(e.stack || "stack trace undefined");
}