926 lines
32 KiB
TypeScript
926 lines
32 KiB
TypeScript
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import * as basic from "./compiler";
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import { EmuHalt } from "../emu";
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import { SourceLocation } from "../workertypes";
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function isLiteral(arg: basic.Expr): arg is basic.Literal {
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return (arg as any).value != null;
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}
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function isLookup(arg: basic.Expr): arg is basic.IndOp {
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return (arg as any).name != null;
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}
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function isBinOp(arg: basic.Expr): arg is basic.BinOp {
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return (arg as any).op != null && (arg as any).left != null && (arg as any).right != null;
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}
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function isUnOp(arg: basic.Expr): arg is basic.UnOp {
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return (arg as any).op != null && (arg as any).expr != null;
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}
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// expr2js() options
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class ExprOptions {
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isconst?: boolean; // only allow constant operations
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novalid?: boolean; // check for valid values when fetching
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locals?: string[]; // pass local variable names when defining functions
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}
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interface CompiledStatement {
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$run?: () => void;
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}
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function isArray(obj) {
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return obj != null && (Array.isArray(obj) || obj.BYTES_PER_ELEMENT);
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}
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export class BASICRuntime {
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program : basic.BASICProgram;
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allstmts : basic.Statement[];
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line2pc : number[];
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pc2line : Map<number,number>;
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label2lineidx : {[label : string] : number};
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label2pc : {[label : string] : number};
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datums : basic.Literal[];
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builtins : {};
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opts : basic.BASICOptions;
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curpc : number;
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dataptr : number;
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vars : {};
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arrays : {};
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defs : {};
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forLoops : { [varname:string] : { $next:(name:string) => void, inner:string } };
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topForLoopName : string;
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returnStack : number[];
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column : number;
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running : boolean = false;
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exited : boolean = true;
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trace : boolean = false;
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load(program: basic.BASICProgram) {
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let prevlabel = this.label2pc && this.getLabelForPC(this.curpc);
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this.program = program;
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this.opts = program.opts;
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this.label2lineidx = {};
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this.label2pc = {};
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this.allstmts = [];
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this.line2pc = [];
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this.pc2line = new Map();
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this.datums = [];
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this.builtins = this.getBuiltinFunctions();
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// TODO: lines start @ 1?
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program.lines.forEach((line, idx) => {
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// make lookup tables
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if (line.label != null) this.label2lineidx[line.label] = idx;
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if (line.label != null) this.label2pc[line.label] = this.allstmts.length;
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this.line2pc.push(this.allstmts.length);
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this.pc2line.set(this.allstmts.length, idx);
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// combine all statements into single list
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line.stmts.forEach((stmt) => this.allstmts.push(stmt));
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});
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// compile statements ahead of time
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this.allstmts.forEach((stmt, pc) => {
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this.curpc = pc + 1; // for error reporting
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this.compileStatement(stmt);
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});
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// parse DATA literals
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this.allstmts.filter((stmt) => stmt.command == 'DATA').forEach((datastmt) => {
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(datastmt as basic.DATA_Statement).datums.forEach(d => {
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//this.curpc = datastmt.$loc.offset; // for error reporting
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var functext = this.expr2js(d, {isconst:true});
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var value = new Function(`return ${functext};`).bind(this)();
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this.datums.push({value:value});
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});
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});
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// try to resume where we left off after loading
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this.curpc = this.label2pc[prevlabel] || 0;
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this.dataptr = Math.min(this.dataptr, this.datums.length);
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}
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reset() {
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this.curpc = 0;
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this.dataptr = 0;
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this.clearVars();
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this.returnStack = [];
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this.column = 0;
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this.running = true;
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this.exited = false;
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}
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clearVars() {
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this.vars = {};
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this.arrays = {};
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this.defs = {}; // TODO? only in interpreters
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this.forLoops = {};
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this.topForLoopName = null;
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// initialize arrays?
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if (this.opts && this.opts.staticArrays) {
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this.allstmts.filter((stmt) => stmt.command == 'DIM').forEach((dimstmt: basic.DIM_Statement) => {
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dimstmt.args.forEach( (arg) => this.compileJS(this._DIM(arg))() );
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});
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}
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}
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getBuiltinFunctions() {
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var fnames = this.program && this.opts.validFunctions;
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// if no valid function list, look for ABC...() functions in prototype
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if (!fnames) fnames = Object.keys(BASICRuntime.prototype).filter((name) => /^[A-Z]{3,}[$]?$/.test(name));
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var dict = {};
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for (var fn of fnames) if (this[fn]) dict[fn] = this[fn].bind(this);
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return dict;
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}
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runtimeError(msg : string) {
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this.curpc--; // we did curpc++ before executing statement
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throw new EmuHalt(msg, this.getCurrentSourceLocation());
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}
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dialectError(what : string) {
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this.runtimeError(`I can't ${what} in this dialect of BASIC.`);
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}
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getLineForPC(pc:number) {
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var stmt = this.allstmts[pc];
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return stmt && stmt.$loc && stmt.$loc.line;
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}
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getLabelForPC(pc:number) {
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var stmt = this.allstmts[pc];
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return stmt && stmt.$loc && stmt.$loc.label;
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}
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getCurrentSourceLocation() : SourceLocation {
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var stmt = this.getStatement();
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return stmt && stmt.$loc;
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}
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getCurrentLabel() : string {
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var loc = this.getCurrentSourceLocation();
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return loc && loc.label;
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}
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getStatement() {
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return this.allstmts[this.curpc];
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}
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step() : boolean {
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if (!this.running) return false;
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var stmt = this.getStatement();
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// end of program?
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if (!stmt) {
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this.running = false;
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this.exited = true;
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return false;
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}
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if (this.trace) console.log(this.curpc, stmt, this.vars, Object.keys(this.arrays));
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// skip to next statment
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this.curpc++;
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// compile (unless cached) and execute statement
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this.executeStatement(stmt);
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return this.running;
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}
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compileStatement(stmt: basic.Statement & CompiledStatement) {
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if (stmt.$run == null) {
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try {
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var stmtfn = this['do__' + stmt.command];
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if (stmtfn == null) this.runtimeError(`I don't know how to "${stmt.command}".`);
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var functext = stmtfn.bind(this)(stmt);
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if (this.trace) console.log(functext);
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stmt.$run = this.compileJS(functext);
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} catch (e) {
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console.log(functext);
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throw e;
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}
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}
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}
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compileJS(functext: string) : () => void {
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return new Function(functext).bind(this);
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}
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executeStatement(stmt: basic.Statement & CompiledStatement) {
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// compile (unless cached)
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this.compileStatement(stmt);
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// run compiled statement
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stmt.$run();
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}
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skipToEOL() {
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do {
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this.curpc++;
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} while (this.curpc < this.allstmts.length && !this.pc2line.get(this.curpc));
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}
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skipToElse() {
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do {
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// in Altair BASIC, ELSE is bound to the right-most IF
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// TODO: this is complicated, we should just have nested expressions
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if (this.opts.ifElse) {
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var cmd = this.allstmts[this.curpc].command;
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if (cmd == 'ELSE') { this.curpc++; break; }
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else if (cmd == 'IF') return this.skipToEOL();
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}
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this.curpc++;
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} while (this.curpc < this.allstmts.length && !this.pc2line.get(this.curpc));
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}
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skipToEOF() {
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this.curpc = this.allstmts.length;
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}
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skipToAfterNext(forname: string) : void {
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var pc = this.curpc;
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while (pc < this.allstmts.length) {
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var stmt = this.allstmts[pc];
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if (stmt.command == 'NEXT') {
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var nextlexpr = (stmt as basic.NEXT_Statement).lexpr;
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if (nextlexpr && nextlexpr.name == forname) {
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this.curpc = pc + 1;
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return;
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}
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}
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pc++;
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}
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this.runtimeError(`I couldn't find a matching NEXT ${forname} to skip this for loop.`);
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}
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gotoLabel(label) {
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var pc = this.label2pc[label];
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if (pc >= 0) {
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this.curpc = pc;
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} else {
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this.runtimeError(`I tried to go to the label "${label}" but couldn't find it.`);
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}
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}
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gosubLabel(label) {
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if (this.returnStack.length > 65535)
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this.runtimeError(`I did too many GOSUBs without a RETURN.`)
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this.returnStack.push(this.curpc);
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this.gotoLabel(label);
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}
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returnFromGosub() {
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if (this.returnStack.length == 0)
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this.runtimeError("I tried to RETURN, but there wasn't a corresponding GOSUB."); // RETURN BEFORE GOSUB
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var pc = this.returnStack.pop();
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this.curpc = pc;
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}
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popReturnStack() {
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if (this.returnStack.length == 0)
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this.runtimeError("I tried to POP, but there wasn't a corresponding GOSUB.");
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this.returnStack.pop();
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}
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valueToString(obj) : string {
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var str;
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if (typeof obj === 'number') {
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var numstr = obj.toString().toUpperCase();
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var numlen = this.opts.printZoneLength - 4;
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var prec = numlen;
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while (numstr.length > numlen) {
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numstr = obj.toPrecision(prec--);
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}
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if (numstr.startsWith('0.'))
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numstr = numstr.substr(1);
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else if (numstr.startsWith('-0.'))
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numstr = '-'+numstr.substr(2);
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if (!this.opts.numericPadding)
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str = numstr;
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else if (numstr.startsWith('-'))
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str = `${numstr} `;
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else
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str = ` ${numstr} `;
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} else if (obj == '\n') {
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this.column = 0;
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str = obj;
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} else if (obj == '\t') {
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var curgroup = Math.floor(this.column / this.opts.printZoneLength);
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var nextcol = (curgroup + 1) * this.opts.printZoneLength;
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str = this.TAB(nextcol);
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} else {
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str = `${obj}`;
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}
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return str;
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}
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printExpr(obj) {
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var str = this.valueToString(obj);
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this.column += str.length;
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this.print(str);
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}
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// override this
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print(str: string) {
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console.log(str);
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}
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// override this
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async input(prompt: string, nargs: number) : Promise<string[]> {
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return [];
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}
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// override this
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resume() { }
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expr2js(expr: basic.Expr, opts?: ExprOptions) : string {
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if (!opts) opts = {};
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if (isLiteral(expr)) {
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return JSON.stringify(expr.value);
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} else if (isLookup(expr)) {
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if (!expr.args && opts.locals && opts.locals.indexOf(expr.name) >= 0) {
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return expr.name; // local arg in DEF
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} else {
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if (opts.isconst)
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this.runtimeError(`I expected a constant value here.`); // TODO: check at compile-time?
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var s = '';
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var qname = JSON.stringify(expr.name);
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let jsargs = expr.args ? expr.args.map((arg) => this.expr2js(arg, opts)).join(', ') : [];
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if (expr.name.startsWith("FN")) { // is it a user-defined function?
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// TODO: check argument count?
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s += `this.getDef(${qname})(${jsargs})`;
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// TODO: detect recursion?
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} else if (this.builtins[expr.name]) { // is it a built-in function?
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this.checkFuncArgs(expr, this.builtins[expr.name]);
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s += `this.builtins.${expr.name}(${jsargs})`;
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} else if (expr.args) {
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s += `this.arrayGet(${qname}, ${jsargs})`;
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} else { // just a variable
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s += `this.vars.${expr.name}`;
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}
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return opts.novalid ? s : `this.checkValue(${s}, ${qname})`;
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}
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} else if (isBinOp(expr)) {
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var left = this.expr2js(expr.left, opts);
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var right = this.expr2js(expr.right, opts);
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return `this.${expr.op}(${left}, ${right})`;
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} else if (isUnOp(expr)) {
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var e = this.expr2js(expr.expr, opts);
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return `this.${expr.op}(${e})`;
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}
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}
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assign2js(expr: basic.IndOp, opts?: ExprOptions) {
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if (!opts) opts = {};
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var s = '';
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var qname = JSON.stringify(expr.name);
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// is it a function? not allowed
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if (expr.name.startsWith("FN") || this.builtins[expr.name]) this.runtimeError(`I can't call a function here.`);
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// is it a subscript?
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if (expr.args) {
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s += this.expr2js(expr, {novalid:true}); // check array bounds
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s += `;this.getArray(${qname}, ${expr.args.length})`;
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s += expr.args.map((arg) => '[this.ROUND('+this.expr2js(arg, opts)+')]').join('');
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} else { // just a variable
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s = `this.vars.${expr.name}`;
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}
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return s;
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}
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checkFuncArgs(expr: basic.IndOp, fn: Function) {
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// TODO: check types?
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var nargs = expr.args ? expr.args.length : 0;
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// exceptions
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if (expr.name == 'RND' && nargs == 0) return;
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if (expr.name == 'MID$' && nargs == 2) return;
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if (expr.name == 'INSTR' && nargs == 2) return;
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if (fn.length != nargs)
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this.runtimeError(`I expected ${fn.length} arguments for the ${expr.name} function, but I got ${nargs}.`);
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}
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startForLoop(forname, init, targ, step) {
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var pc = this.curpc;
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if (!step) step = 1;
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this.vars[forname] = init;
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if (this.trace) console.log(`FOR ${forname} = ${init} TO ${targ} STEP ${step}`);
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// create done function
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var loopdone = () => {
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return step >= 0 ? this.vars[forname] > targ : this.vars[forname] < targ;
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}
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// skip entire for loop before first iteration? (Minimal BASIC)
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if (this.opts.testInitialFor && loopdone())
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return this.skipToAfterNext(forname);
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// save for var name on top of linked-list stack
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var inner = this.topForLoopName;
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this.topForLoopName = forname;
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// create for loop record
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this.forLoops[forname] = {
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inner: inner,
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$next: (nextname:string) => {
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if (nextname && forname != nextname)
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this.runtimeError(`I executed NEXT "${nextname}", but the last FOR was for "${forname}".`)
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this.vars[forname] += step;
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var done = loopdone();
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if (done) {
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// pop FOR off the stack and continue
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this.topForLoopName = inner;
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delete this.forLoops[forname];
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} else {
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this.curpc = pc; // go back to FOR location
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}
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if (this.trace) console.log(`NEXT ${forname}: ${this.vars[forname]} TO ${targ} STEP ${step} DONE=${done}`);
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}
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};
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}
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nextForLoop(name) {
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var fl = this.forLoops[name];
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if (!fl) this.runtimeError(`I couldn't find a FOR for this NEXT.`)
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fl.$next(name);
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}
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// converts a variable to string/number based on var name
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assign(name: string, right: number|string) : number|string {
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if (this.opts.typeConvert)
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return this.convert(name, right);
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// TODO: use options
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if (name.endsWith("$")) {
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return this.convertToString(right, name);
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} else {
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return this.convertToNumber(right, name);
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}
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}
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convert(name: string, right: number|string) : number|string {
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if (name.endsWith("$")) {
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return right == null ? "" : right.toString();
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} else if (typeof right === 'number') {
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return right;
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} else {
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return parseFloat(right+"");
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}
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}
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convertToString(right: number|string, name?: string) {
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if (typeof right !== 'string') this.runtimeError(`I can't convert ${right} to a string.`);
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else return right;
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}
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convertToNumber(right: number|string, name?: string) {
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if (typeof right !== 'number') this.runtimeError(`I can't convert ${right} to a number.`);
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else return this.checkNum(right);
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}
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// dimension array
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dimArray(name: string, ...dims:number[]) {
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// TODO: maybe do this check at compile-time?
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if (this.arrays[name] != null) {
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if (this.opts.staticArrays) return;
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else this.runtimeError(`I already dimensioned this array (${name}) earlier.`)
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}
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var isstring = name.endsWith('$');
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// if numeric value, we use Float64Array which inits to 0
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var arrcons = isstring ? Array : Float64Array;
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if (dims.length == 1) {
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this.arrays[name] = new arrcons(dims[0]+1);
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} else if (dims.length == 2) {
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this.arrays[name] = new Array(dims[0]+1);
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for (var i=0; i<dims[0]+1; i++) {
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this.arrays[name][i] = new arrcons(dims[1]+1);
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}
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} else {
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this.runtimeError(`I only support arrays of one or two dimensions.`)
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}
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}
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getArray(name: string, order: number) : [] {
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if (!this.arrays[name]) {
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if (this.opts.defaultArraySize == 0)
|
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this.dialectError(`automatically declare arrays without a DIM statement`);
|
|
if (order == 1)
|
|
this.dimArray(name, this.opts.defaultArraySize-1);
|
|
else if (order == 2)
|
|
this.dimArray(name, this.opts.defaultArraySize-1, this.opts.defaultArraySize-1);
|
|
else
|
|
this.runtimeError(`I only support arrays of one or two dimensions.`); // TODO
|
|
}
|
|
return this.arrays[name];
|
|
}
|
|
|
|
arrayGet(name: string, ...indices: number[]) : basic.Value {
|
|
var arr = this.getArray(name, indices.length);
|
|
indices = indices.map(Math.round);
|
|
var v = arr;
|
|
for (var i=0; i<indices.length; i++) {
|
|
var idx = indices[i];
|
|
if (!isArray(v))
|
|
this.runtimeError(`I tried to lookup ${name}(${indices}) but used too many dimensions.`);
|
|
if (idx < this.opts.defaultArrayBase)
|
|
this.runtimeError(`I tried to lookup ${name}(${indices}) but an index was less than ${this.opts.defaultArrayBase}.`);
|
|
if (idx >= v.length) // TODO: also can happen when mispelling function name
|
|
this.runtimeError(`I tried to lookup ${name}(${indices}) but it exceeded the dimensions of the array.`);
|
|
v = v[indices[i]];
|
|
}
|
|
if (isArray(v)) // i.e. is an array?
|
|
this.runtimeError(`I tried to lookup ${name}(${indices}) but used too few dimensions.`);
|
|
return (v as any) as basic.Value;
|
|
}
|
|
|
|
onGotoLabel(value: number, ...labels: string[]) {
|
|
value = this.ROUND(value);
|
|
if (value < 1 || value > labels.length)
|
|
this.runtimeError(`I needed a number between 1 and ${labels.length}, but I got ${value}.`);
|
|
this.gotoLabel(labels[value-1]);
|
|
|
|
}
|
|
onGosubLabel(value: number, ...labels: string[]) {
|
|
value = this.ROUND(value);
|
|
if (value < 1 || value > labels.length)
|
|
this.runtimeError(`I needed a number between 1 and ${labels.length}, but I got ${value}.`);
|
|
this.gosubLabel(labels[value-1]);
|
|
}
|
|
|
|
nextDatum() : basic.Value {
|
|
if (this.dataptr >= this.datums.length)
|
|
this.runtimeError("I tried to READ, but ran out of data.");
|
|
return this.datums[this.dataptr++].value;
|
|
}
|
|
|
|
//// STATEMENTS
|
|
|
|
do__PRINT(stmt : basic.PRINT_Statement) {
|
|
var s = '';
|
|
for (var arg of stmt.args) {
|
|
var expr = this.expr2js(arg);
|
|
s += `this.printExpr(${expr});`;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
do__INPUT(stmt : basic.INPUT_Statement) {
|
|
var prompt = this.expr2js(stmt.prompt);
|
|
var setvals = '';
|
|
stmt.args.forEach((arg, index) => {
|
|
var lexpr = this.assign2js(arg);
|
|
setvals += `
|
|
var value = this.convert(${JSON.stringify(arg.name)}, vals[${index}]);
|
|
valid &= this.isValid(value);
|
|
${lexpr} = value;
|
|
`
|
|
});
|
|
return `this.running=false; this.curpc--;
|
|
this.input(${prompt}, ${stmt.args.length}).then((vals) => {
|
|
let valid = 1;
|
|
${setvals}
|
|
if (valid) this.curpc++;
|
|
this.running=true;
|
|
this.resume();
|
|
})`;
|
|
}
|
|
|
|
do__LET(stmt : basic.LET_Statement) {
|
|
// TODO: range-checking for subscripts (get and set)
|
|
var lexpr = this.assign2js(stmt.lexpr);
|
|
var right = this.expr2js(stmt.right);
|
|
return `${lexpr} = this.assign(${JSON.stringify(stmt.lexpr.name)}, ${right});`;
|
|
}
|
|
|
|
do__FOR(stmt : basic.FOR_Statement) {
|
|
var name = JSON.stringify(stmt.lexpr.name); // TODO: args?
|
|
var init = this.expr2js(stmt.initial);
|
|
var targ = this.expr2js(stmt.target);
|
|
var step = stmt.step ? this.expr2js(stmt.step) : 'null';
|
|
return `this.startForLoop(${name}, ${init}, ${targ}, ${step})`;
|
|
}
|
|
|
|
do__NEXT(stmt : basic.NEXT_Statement) {
|
|
var name = stmt.lexpr && JSON.stringify(stmt.lexpr.name); // TODO: args? lexpr == null?
|
|
return `this.nextForLoop(${name})`;
|
|
}
|
|
|
|
do__IF(stmt : basic.IF_Statement) {
|
|
var cond = this.expr2js(stmt.cond);
|
|
return `if (!(${cond})) { this.skipToElse(); }`
|
|
}
|
|
|
|
do__ELSE() {
|
|
return `this.skipToEOL()`
|
|
}
|
|
|
|
do__DEF(stmt : basic.DEF_Statement) {
|
|
var args = [];
|
|
for (var arg of stmt.lexpr.args || []) {
|
|
if (isLookup(arg)) {
|
|
args.push(arg.name);
|
|
} else {
|
|
this.runtimeError("I found a DEF statement with arguments other than variable names.");
|
|
}
|
|
}
|
|
var functext = this.expr2js(stmt.def, {locals:args});
|
|
//this.defs[stmt.lexpr.name] = new Function(args.join(','), functext).bind(this);
|
|
return `this.defs.${stmt.lexpr.name} = function(${args.join(',')}) { return ${functext}; }.bind(this)`;
|
|
}
|
|
|
|
_DIM(dim : basic.IndOp) {
|
|
var argsstr = '';
|
|
for (var arg of dim.args) {
|
|
// TODO: check for float (or at compile time)
|
|
argsstr += ', ' + this.expr2js(arg, {isconst: this.opts.staticArrays});
|
|
}
|
|
return `this.dimArray(${JSON.stringify(dim.name)}${argsstr});`;
|
|
}
|
|
|
|
do__DIM(stmt : basic.DIM_Statement) {
|
|
if (this.opts.staticArrays) return; // DIM at reset()
|
|
var s = '';
|
|
stmt.args.forEach((dim) => s += this._DIM(dim));
|
|
return s;
|
|
}
|
|
|
|
do__GOTO(stmt : basic.GOTO_Statement) {
|
|
var label = this.expr2js(stmt.label, {isconst:true});
|
|
return `this.gotoLabel(${label})`;
|
|
}
|
|
|
|
do__GOSUB(stmt : basic.GOSUB_Statement) {
|
|
var label = this.expr2js(stmt.label, {isconst:true});
|
|
return `this.gosubLabel(${label})`;
|
|
}
|
|
|
|
do__RETURN(stmt : basic.RETURN_Statement) {
|
|
return `this.returnFromGosub()`;
|
|
}
|
|
|
|
do__ONGOTO(stmt : basic.ONGOTO_Statement) {
|
|
var expr = this.expr2js(stmt.expr);
|
|
var labels = stmt.labels.map((arg) => this.expr2js(arg, {isconst:true})).join(', ');
|
|
if (stmt.command == 'ONGOTO')
|
|
return `this.onGotoLabel(${expr}, ${labels})`;
|
|
else
|
|
return `this.onGosubLabel(${expr}, ${labels})`;
|
|
}
|
|
|
|
do__DATA() {
|
|
// data is preprocessed
|
|
}
|
|
|
|
do__READ(stmt : basic.READ_Statement) {
|
|
var s = '';
|
|
stmt.args.forEach((arg) => {
|
|
s += `${this.assign2js(arg)} = this.assign(${JSON.stringify(arg.name)}, this.nextDatum());`;
|
|
});
|
|
return s;
|
|
}
|
|
|
|
do__RESTORE() {
|
|
return `this.dataptr = 0`;
|
|
}
|
|
|
|
do__END() {
|
|
return `this.skipToEOF()`;
|
|
}
|
|
|
|
do__STOP() {
|
|
return `this.skipToEOF()`;
|
|
}
|
|
|
|
do__OPTION(stmt: basic.OPTION_Statement) {
|
|
// already parsed in compiler
|
|
}
|
|
|
|
do__POP() {
|
|
return `this.popReturnStack()`;
|
|
}
|
|
|
|
do__GET(stmt : basic.GET_Statement) {
|
|
var lexpr = this.assign2js(stmt.lexpr);
|
|
// TODO: single key input
|
|
return `this.running=false; this.curpc--;
|
|
this.input().then((vals) => {
|
|
${lexpr} = this.convert(${JSON.stringify(stmt.lexpr.name)}, vals[0]);
|
|
this.running=true; this.curpc++;
|
|
this.resume();
|
|
})`;
|
|
}
|
|
|
|
do__CLEAR() {
|
|
return 'this.clearVars()';
|
|
}
|
|
|
|
// TODO: ONERR, ON ERROR GOTO
|
|
// TODO: "SUBSCRIPT ERROR" (range check)
|
|
// TODO: gosubs nested too deeply
|
|
// TODO: memory quota
|
|
// TODO: useless loop (! 4th edition)
|
|
// TODO: other 4th edition errors
|
|
// TODO: ecma55 all-or-none input checking?
|
|
|
|
// FUNCTIONS
|
|
|
|
isValid(obj:number|string) : boolean {
|
|
if (typeof obj === 'number' && !isNaN(obj) && isFinite(obj))
|
|
return true;
|
|
else if (typeof obj === 'string')
|
|
return true;
|
|
else
|
|
return false;
|
|
}
|
|
checkValue(obj:number|string, exprname:string) : number|string {
|
|
// check for unreferenced value
|
|
if (typeof obj !== 'number' && typeof obj !== 'string') {
|
|
// assign default value?
|
|
if (obj == null && this.opts.defaultValues) {
|
|
return exprname.endsWith("$") ? "" : 0;
|
|
}
|
|
if (exprname != null && obj == null) {
|
|
this.runtimeError(`I haven't set a value for ${exprname}.`);
|
|
} else if (exprname != null) {
|
|
this.runtimeError(`I got an invalid value for ${exprname}: ${obj}`);
|
|
} else {
|
|
this.runtimeError(`I got an invalid value: ${obj}`);
|
|
}
|
|
}
|
|
return obj;
|
|
}
|
|
getDef(exprname: string) {
|
|
var fn = this.defs[exprname];
|
|
if (!fn) this.runtimeError(`I haven't run a DEF statement for ${exprname}.`);
|
|
return fn;
|
|
}
|
|
checkNum(n:number) : number {
|
|
if (n === Infinity) this.runtimeError(`I computed a number too big to store.`);
|
|
if (isNaN(n)) this.runtimeError(`I computed an invalid number.`);
|
|
return n;
|
|
}
|
|
checkString(s:string) : string {
|
|
if (typeof s !== 'string')
|
|
this.runtimeError(`I expected a string here.`);
|
|
else if (s.length > this.opts.maxStringLength)
|
|
this.dialectError(`create strings longer than ${this.opts.maxStringLength} characters`);
|
|
return s;
|
|
}
|
|
|
|
add(a, b) : number|string {
|
|
// TODO: if string-concat
|
|
if (typeof a === 'number' && typeof b === 'number')
|
|
return this.checkNum(a + b);
|
|
else if (this.opts.stringConcat)
|
|
return this.checkString(a + b);
|
|
else
|
|
this.dialectError(`use the "+" operator to concatenate strings`)
|
|
}
|
|
sub(a:number, b:number) : number {
|
|
return this.checkNum(a - b);
|
|
}
|
|
mul(a:number, b:number) : number {
|
|
return this.checkNum(a * b);
|
|
}
|
|
div(a:number, b:number) : number {
|
|
if (b == 0) this.runtimeError(`I can't divide by zero.`);
|
|
return this.checkNum(a / b);
|
|
}
|
|
idiv(a:number, b:number) : number {
|
|
return this.FIX(this.INT(a) / this.INT(b));
|
|
}
|
|
mod(a:number, b:number) : number {
|
|
return this.checkNum(a % b);
|
|
}
|
|
pow(a:number, b:number) : number {
|
|
if (a == 0 && b < 0) this.runtimeError(`I can't raise zero to a negative power.`);
|
|
return this.checkNum(Math.pow(a, b));
|
|
}
|
|
band(a:number, b:number) : number {
|
|
return a & b;
|
|
}
|
|
bor(a:number, b:number) : number {
|
|
return a | b;
|
|
}
|
|
bnot(a:number) : number {
|
|
return ~a;
|
|
}
|
|
bxor(a:number, b:number) : number {
|
|
return a ^ b;
|
|
}
|
|
bimp(a:number, b:number) : number {
|
|
return this.bor(this.bnot(a), b);
|
|
}
|
|
beqv(a:number, b:number) : number {
|
|
return this.bnot(this.bxor(a, b));
|
|
}
|
|
land(a:number, b:number) : number {
|
|
return a && b ? (this.opts.bitwiseLogic ? -1 : 1) : 0;
|
|
}
|
|
lor(a:number, b:number) : number {
|
|
return a || b ? (this.opts.bitwiseLogic ? -1 : 1) : 0;
|
|
}
|
|
lnot(a:number) : number {
|
|
return a ? 0 : (this.opts.bitwiseLogic ? -1 : 1);
|
|
}
|
|
neg(a:number) : number {
|
|
return -a;
|
|
}
|
|
eq(a:number, b:number) : number {
|
|
return a == b ? (this.opts.bitwiseLogic ? -1 : 1) : 0;
|
|
}
|
|
ne(a:number, b:number) : number {
|
|
return a != b ? (this.opts.bitwiseLogic ? -1 : 1) : 0;
|
|
}
|
|
lt(a:number, b:number) : number {
|
|
return a < b ? (this.opts.bitwiseLogic ? -1 : 1) : 0;
|
|
}
|
|
gt(a:number, b:number) : number {
|
|
return a > b ? (this.opts.bitwiseLogic ? -1 : 1) : 0;
|
|
}
|
|
le(a:number, b:number) : number {
|
|
return a <= b ? (this.opts.bitwiseLogic ? -1 : 1) : 0;
|
|
}
|
|
ge(a:number, b:number) : number {
|
|
return a >= b ? (this.opts.bitwiseLogic ? -1 : 1) : 0;
|
|
}
|
|
|
|
// FUNCTIONS (uppercase)
|
|
|
|
ABS(arg : number) : number {
|
|
return this.checkNum(Math.abs(arg));
|
|
}
|
|
ASC(arg : string) : number {
|
|
return arg.charCodeAt(0);
|
|
}
|
|
ATN(arg : number) : number {
|
|
return this.checkNum(Math.atan(arg));
|
|
}
|
|
CHR$(arg : number) : string {
|
|
return String.fromCharCode(this.checkNum(arg));
|
|
}
|
|
COS(arg : number) : number {
|
|
return this.checkNum(Math.cos(arg));
|
|
}
|
|
COT(arg : number) : number {
|
|
return this.checkNum(1.0 / Math.tan(arg)); // 4th edition only
|
|
}
|
|
EXP(arg : number) : number {
|
|
return this.checkNum(Math.exp(arg));
|
|
}
|
|
FIX(arg : number) : number {
|
|
return this.checkNum(arg < 0 ? Math.ceil(arg) : Math.floor(arg));
|
|
}
|
|
HEX$(arg : number) : string {
|
|
return arg.toString(16);
|
|
}
|
|
INSTR(a, b, c) : number {
|
|
if (c != null) {
|
|
return this.checkString(c).indexOf(this.checkString(b), a) + 1;
|
|
} else {
|
|
return this.checkString(b).indexOf(this.checkString(a)) + 1;
|
|
}
|
|
}
|
|
INT(arg : number) : number {
|
|
return this.checkNum(Math.floor(arg));
|
|
}
|
|
LEFT$(arg : string, count : number) : string {
|
|
return arg.substr(0, count);
|
|
}
|
|
LEN(arg : string) : number {
|
|
return arg.length;
|
|
}
|
|
LOG(arg : number) : number {
|
|
if (arg == 0) this.runtimeError(`I can't take the logarithm of zero (${arg}).`)
|
|
if (arg < 0) this.runtimeError(`I can't take the logarithm of a negative number (${arg}).`)
|
|
return this.checkNum(Math.log(arg));
|
|
}
|
|
MID$(arg : string, start : number, count : number) : string {
|
|
if (start < 1) this.runtimeError(`I can't compute MID$ if the starting index is less than 1.`)
|
|
if (count == 0) count = arg.length;
|
|
return arg.substr(start-1, count);
|
|
}
|
|
RIGHT$(arg : string, count : number) : string {
|
|
return arg.substr(arg.length - count, count);
|
|
}
|
|
RND(arg : number) : number {
|
|
return Math.random(); // argument ignored
|
|
}
|
|
ROUND(arg : number) : number {
|
|
return this.checkNum(Math.round(arg));
|
|
}
|
|
SGN(arg : number) : number {
|
|
return (arg < 0) ? -1 : (arg > 0) ? 1 : 0;
|
|
}
|
|
SIN(arg : number) : number {
|
|
return this.checkNum(Math.sin(arg));
|
|
}
|
|
SPACE$(arg : number) : string {
|
|
return (arg > 0) ? ' '.repeat(this.checkNum(arg)) : '';
|
|
}
|
|
SQR(arg : number) : number {
|
|
if (arg < 0) this.runtimeError(`I can't take the square root of a negative number (${arg}).`)
|
|
return this.checkNum(Math.sqrt(arg));
|
|
}
|
|
STR$(arg : number) : string {
|
|
return this.valueToString(this.checkNum(arg));
|
|
}
|
|
TAB(arg : number) : string {
|
|
if (arg < 1) { arg = 1; } // TODO: SYSTEM MESSAGE IDENTIFYING THE EXCEPTION
|
|
var spaces = this.ROUND(arg) - 1 - this.column;
|
|
return (spaces > 0) ? ' '.repeat(spaces) : '';
|
|
}
|
|
TAN(arg : number) : number {
|
|
return this.checkNum(Math.tan(arg));
|
|
}
|
|
TIMER() : number {
|
|
return Date.now() / 1000;
|
|
}
|
|
VAL(arg : string) : number {
|
|
var n = parseFloat(this.checkString(arg));
|
|
return isNaN(n) ? 0 : n; // TODO? altair works this way
|
|
}
|
|
}
|