680 lines
21 KiB
TypeScript
680 lines
21 KiB
TypeScript
import { WorkerError, CodeListingMap, SourceLocation } from "../workertypes";
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export interface SourceLocated {
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$loc?: SourceLocation;
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}
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class CompileError extends Error {
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constructor(msg: string) {
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super(msg);
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Object.setPrototypeOf(this, CompileError.prototype);
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}
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}
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// Lexer regular expression -- each (capture group) handles a different token type
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const re_toks = /([0-9.]+[E][+-]?\d+)|(\d*[.]\d*[E0-9]*)|(\d+)|(['].*)|(\bAND\b)|(\bOR\b)|(\w+[$]?)|(".*?")|([<>]?[=<>])|([-+*/^,;:()])|(\S+)/gi;
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export enum TokenType {
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EOL = 0,
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Float1,
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Float2,
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Int,
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Remark,
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And,
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Or,
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Ident,
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String,
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Relational,
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Operator,
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CatchAll,
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_LAST,
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}
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export type ExprTypes = BinOp | UnOp | IndOp | Literal;
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export type Expr = ExprTypes & SourceLocated;
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export type Opcode = 'add' | 'sub' | 'mul' | 'div' | 'pow' | 'eq' | 'ne' | 'lt' | 'gt' | 'le' | 'ge' | 'land' | 'lor';
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export type Value = string | number;
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export interface Literal {
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value: Value;
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}
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export interface BinOp {
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op: Opcode;
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left: Expr;
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right: Expr;
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}
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export interface UnOp {
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op: 'neg';
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expr: Expr;
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}
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export interface IndOp extends SourceLocated {
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name: string;
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args: Expr[];
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}
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export interface PRINT_Statement {
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command: "PRINT";
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args: Expr[];
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}
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export interface LET_Statement {
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command: "LET";
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lexpr: IndOp;
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right: Expr;
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}
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export interface GOTO_Statement {
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command: "GOTO";
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label: Expr;
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}
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export interface GOSUB_Statement {
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command: "GOSUB";
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label: Expr;
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}
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export interface RETURN_Statement {
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command: "RETURN";
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}
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export interface IF_Statement {
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command: "IF";
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cond: Expr;
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}
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export interface FOR_Statement {
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command: "FOR";
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lexpr: IndOp;
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initial: Expr;
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target: Expr;
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step?: Expr;
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}
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export interface NEXT_Statement {
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command: "NEXT";
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lexpr?: IndOp;
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}
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export interface DIM_Statement {
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command: "DIM";
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args: IndOp[];
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}
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export interface INPUT_Statement {
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command: "INPUT";
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prompt: Expr;
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args: IndOp[];
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}
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export interface READ_Statement {
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command: "INPUT";
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args: IndOp[];
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}
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export interface DEF_Statement {
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command: "DEF";
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lexpr: IndOp;
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def: Expr;
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}
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export interface ONGOTO_Statement {
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command: "ONGOTO";
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expr: Expr;
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labels: Expr[];
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}
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export interface DATA_Statement {
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command: "DATA";
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datums: Expr[];
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}
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export interface OPTION_Statement {
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command: "OPTION";
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optname: string;
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optargs: string[];
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}
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export type StatementTypes = PRINT_Statement | LET_Statement | GOTO_Statement | GOSUB_Statement
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| IF_Statement | FOR_Statement | DATA_Statement;
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export type Statement = StatementTypes & SourceLocated;
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export interface BASICLine {
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label: string;
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stmts: Statement[];
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}
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export interface BASICProgram {
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lines: BASICLine[];
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}
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class Token {
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str: string;
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type: TokenType;
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$loc: SourceLocation;
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}
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const OPERATORS = {
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'AND': {f:'land',p:5},
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'OR': {f:'lor',p:5},
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'=': {f:'eq',p:10},
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'<>': {f:'ne',p:10},
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'<': {f:'lt',p:10},
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'>': {f:'gt',p:10},
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'<=': {f:'le',p:10},
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'>=': {f:'ge',p:10},
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'+': {f:'add',p:100},
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'-': {f:'sub',p:100},
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'*': {f:'mul',p:200},
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'/': {f:'div',p:200},
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'^': {f:'pow',p:300}
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};
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function getOpcodeForOperator(op: string): Opcode {
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return OPERATORS[op].f as Opcode;
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}
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function getPrecedence(tok: Token): number {
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switch (tok.type) {
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case TokenType.Operator:
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case TokenType.Relational:
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case TokenType.Ident:
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let op = OPERATORS[tok.str]
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if (op) return op.p;
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}
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return -1;
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}
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// is token an end of statement marker? (":" or end of line)
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function isEOS(tok: Token) {
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return (tok.type == TokenType.EOL) || (tok.type == TokenType.Operator && tok.str == ':');
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}
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function stripQuotes(s: string) {
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// TODO: assert
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return s.substr(1, s.length-2);
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}
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// TODO
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export interface BASICOptions {
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uppercaseOnly : boolean; // convert everything to uppercase?
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strictVarNames : boolean; // only allow A0-9 for numerics, single letter for arrays/strings
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sharedArrayNamespace : boolean; // arrays and variables have same namespace? (conflict)
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defaultArrayBase : number; // arrays start at this number (0 or 1)
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defaultArraySize : number; // arrays are allocated w/ this size (starting @ 0)
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maxDimensions : number; // max number of dimensions for arrays
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stringConcat : boolean; // can concat strings with "+" operator?
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typeConvert : boolean; // type convert strings <-> numbers?
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maxArguments : number; // maximum # of arguments for user-defined functions
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sparseArrays : boolean; // true == don't require DIM for arrays
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tickComments : boolean; // support 'comments?
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validKeywords : string[]; // valid keywords (or null for accept all)
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validFunctions : string[]; // valid functions (or null for accept all)
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validOperators : string[]; // valid operators (or null for accept all)
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printZoneLength : number; // print zone length
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printPrecision : number; // print precision # of digits
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checkOverflow : boolean; // check for overflow of numerics?
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defaultValues : boolean; // initialize unset variables to default value? (0 or "")
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}
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///// BASIC PARSER
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export class BASICParser {
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tokens: Token[];
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errors: WorkerError[];
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labels: { [label: string]: BASICLine };
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targets: { [targetlabel: string]: SourceLocation };
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eol: Token;
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lineno : number;
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curlabel: string;
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listings: CodeListingMap;
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lasttoken: Token;
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opts : BASICOptions = ALTAIR_BASIC40;
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constructor() {
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this.labels = {};
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this.targets = {};
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this.errors = [];
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this.lineno = 0;
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this.curlabel = null;
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this.listings = {};
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}
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compileError(msg: string, loc?: SourceLocation) {
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if (!loc) loc = this.peekToken().$loc;
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// TODO: pass SourceLocation to errors
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this.errors.push({line:loc.line, msg:msg});
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throw new CompileError(`${msg} (line ${loc.line})`); // TODO: label too?
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}
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dialectError(what: string, loc?: SourceLocation) {
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this.compileError(`The selected BASIC dialect doesn't support ${what}`, loc); // TODO
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}
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consumeToken(): Token {
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var tok = this.lasttoken = (this.tokens.shift() || this.eol);
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return tok;
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}
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expectToken(str: string) : Token {
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var tok = this.consumeToken();
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var tokstr = tok.str.toUpperCase();
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if (str != tokstr) {
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this.compileError(`I expected "${str}" here, but I saw "${tokstr}".`);
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}
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return tok;
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}
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peekToken(): Token {
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var tok = this.tokens[0];
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return tok ? tok : this.eol;
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}
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pushbackToken(tok: Token) {
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this.tokens.unshift(tok);
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}
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parseOptLabel(line: BASICLine) {
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let tok = this.consumeToken();
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switch (tok.type) {
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case TokenType.Int:
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if (this.labels[tok.str] != null) this.compileError(`I saw a duplicated label "${tok.str}".`);
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this.labels[tok.str] = line;
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line.label = tok.str;
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this.curlabel = tok.str;
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break;
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default:
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// TODO
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this.pushbackToken(tok);
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break;
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}
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}
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parseFile(file: string, path: string) : BASICProgram {
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var pgmlines = file.split("\n").map((line) => this.parseLine(line));
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this.checkLabels();
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var program = { lines: pgmlines };
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this.listings[path] = this.generateListing(file, program);
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return program;
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}
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parseLine(line: string) : BASICLine {
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try {
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this.tokenize(line);
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return this.parse();
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} catch (e) {
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if (!(e instanceof CompileError)) throw e; // ignore compile errors since errors[] list captures them
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return {label:null, stmts:[]};
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}
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}
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tokenize(line: string) : void {
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this.lineno++;
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this.tokens = [];
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var m;
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while (m = re_toks.exec(line)) {
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for (var i = 1; i < TokenType._LAST; i++) {
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let s = m[i];
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if (s != null) {
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this.tokens.push({
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str: s,
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type: i,
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$loc: { line: this.lineno, start: m.index, end: m.index+s.length }
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});
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break;
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}
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}
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}
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this.eol = { type: TokenType.EOL, str: "", $loc: { line: this.lineno, start: line.length } };
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}
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parse() : BASICLine {
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var line = {label: null, stmts: []};
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// not empty line?
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if (this.tokens.length) {
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this.parseOptLabel(line);
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line.stmts = this.parseCompoundStatement();
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this.curlabel = null;
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}
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return line;
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}
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parseCompoundStatement(): Statement[] {
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var list = this.parseList(this.parseStatement, ':');
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if (!isEOS(this.peekToken())) this.compileError(`Expected end of line or ':'`, this.peekToken().$loc);
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return list;
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}
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parseStatement(): Statement | null {
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var cmdtok = this.consumeToken();
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var stmt;
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switch (cmdtok.type) {
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case TokenType.Remark:
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if (!this.opts.tickComments) this.dialectError(`tick remarks`);
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return null;
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case TokenType.Ident:
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var cmd = cmdtok.str.toUpperCase();
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// remark? ignore to eol
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if (cmd == 'REM') {
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while (this.consumeToken().type != TokenType.EOL) { }
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return null;
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}
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// look for "GO TO"
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if (cmd == 'GO' && this.peekToken().str == 'TO') {
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this.consumeToken();
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cmd = 'GOTO';
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}
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var fn = this['stmt__' + cmd];
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if (fn) {
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if (this.opts.validKeywords && this.opts.validKeywords.indexOf(cmd) < 0)
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this.dialectError(`the ${cmd} keyword`);
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stmt = fn.bind(this)() as Statement;
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break;
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} else if (this.peekToken().str == '=' || this.peekToken().str == '(') {
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// 'A = expr' or 'A(X) = expr'
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this.pushbackToken(cmdtok);
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stmt = this.stmt__LET();
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break;
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}
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case TokenType.EOL:
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this.compileError(`I expected a command here`);
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return null;
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default:
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this.compileError(`Unknown command "${cmdtok.str}"`);
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return null;
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}
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if (stmt) stmt.$loc = { line: cmdtok.$loc.line, start: cmdtok.$loc.start, end: this.peekToken().$loc.start };
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return stmt;
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}
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parseVarOrIndexedOrFunc(): IndOp {
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return this.parseVarOrIndexed();
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}
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parseVarOrIndexed(): IndOp {
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var tok = this.consumeToken();
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switch (tok.type) {
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case TokenType.Ident:
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let args = null;
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if (this.peekToken().str == '(') {
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this.expectToken('(');
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args = this.parseExprList();
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this.expectToken(')');
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}
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return { name: tok.str, args: args, $loc: tok.$loc };
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default:
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this.compileError("Expected variable or array index");
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break;
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}
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}
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parseList<T>(parseFunc:()=>T, delim:string): T[] {
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var sep;
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var list = [];
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do {
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var el = parseFunc.bind(this)()
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if (el != null) list.push(el);
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sep = this.consumeToken();
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} while (sep.str == delim);
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this.pushbackToken(sep);
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return list;
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}
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parseVarOrIndexedList(): IndOp[] {
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return this.parseList(this.parseVarOrIndexed, ',');
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}
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parseExprList(): Expr[] {
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return this.parseList(this.parseExpr, ',');
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}
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parseLabelList(): Expr[] {
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return this.parseList(this.parseLabel, ',');
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}
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parseLabel() : Expr {
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var tok = this.consumeToken();
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switch (tok.type) {
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case TokenType.Int:
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var label = parseInt(tok.str).toString();
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this.targets[label] = tok.$loc;
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return {value:label};
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default:
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this.compileError(`I expected a line number here`);
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return;
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}
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}
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parsePrimary(): Expr {
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let tok = this.consumeToken();
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switch (tok.type) {
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case TokenType.Int:
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case TokenType.Float1:
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case TokenType.Float2:
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return { value: parseFloat(tok.str), $loc: tok.$loc };
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case TokenType.String:
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return { value: stripQuotes(tok.str), $loc: tok.$loc };
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case TokenType.Ident:
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this.pushbackToken(tok);
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return this.parseVarOrIndexedOrFunc();
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case TokenType.Operator:
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if (tok.str == '(') {
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let expr = this.parseExpr();
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this.expectToken(')');
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return expr;
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} else if (tok.str == '-') {
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let expr = this.parsePrimary(); // TODO: -2^2=-4 and -2-2=-4
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return { op: 'neg', expr: expr };
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} else if (tok.str == '+') {
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return this.parsePrimary(); // TODO?
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}
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default:
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this.compileError(`Unexpected "${tok.str}"`);
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}
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}
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parseExpr1(left: Expr, minPred: number): Expr {
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let look = this.peekToken();
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while (getPrecedence(look) >= minPred) {
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let op = this.consumeToken();
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let right: Expr = this.parsePrimary();
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look = this.peekToken();
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while (getPrecedence(look) > getPrecedence(op)) {
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right = this.parseExpr1(right, getPrecedence(look));
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look = this.peekToken();
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}
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left = { op: getOpcodeForOperator(op.str), left: left, right: right };
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}
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return left;
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}
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parseExpr(): Expr {
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return this.parseExpr1(this.parsePrimary(), 0);
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}
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//// STATEMENTS
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stmt__LET(): LET_Statement {
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var lexpr = this.parseVarOrIndexed();
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this.expectToken("=");
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var right = this.parseExpr();
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return { command: "LET", lexpr: lexpr, right: right };
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}
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stmt__PRINT(): PRINT_Statement {
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var sep, lastsep;
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var list = [];
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do {
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sep = this.peekToken();
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if (isEOS(sep)) {
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break;
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} else if (sep.str == ';') {
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this.consumeToken();
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lastsep = sep;
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} else if (sep.str == ',') {
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this.consumeToken();
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list.push({value:'\t'});
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lastsep = sep;
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} else {
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list.push(this.parseExpr());
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lastsep = null;
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}
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} while (true);
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if (!(lastsep && (lastsep.str == ';' || sep.str != ','))) {
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list.push({value:'\n'});
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}
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return { command: "PRINT", args: list };
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}
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stmt__GOTO(): GOTO_Statement {
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return { command: "GOTO", label: this.parseLabel() };
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}
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stmt__GOSUB(): GOSUB_Statement {
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return { command: "GOSUB", label: this.parseLabel() };
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}
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stmt__IF(): IF_Statement {
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var cond = this.parseExpr();
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var iftrue: Statement[];
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this.expectToken('THEN');
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var lineno = this.peekToken();
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// assume GOTO if number given after THEN
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if (lineno.type == TokenType.Int) {
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this.pushbackToken({type:TokenType.Ident, str:'GOTO', $loc:lineno.$loc});
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}
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// add fake ":"
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this.pushbackToken({type:TokenType.Operator, str:':', $loc:lineno.$loc});
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return { command: "IF", cond: cond };
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}
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stmt__FOR() : FOR_Statement {
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var lexpr = this.parseVarOrIndexed(); // TODO: parseNumVar()
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this.expectToken('=');
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var init = this.parseExpr();
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this.expectToken('TO');
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var targ = this.parseExpr();
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if (this.peekToken().str == 'STEP') {
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this.consumeToken();
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var step = this.parseExpr();
|
|
}
|
|
return { command:'FOR', lexpr:lexpr, initial:init, target:targ, step:step };
|
|
}
|
|
stmt__NEXT() : NEXT_Statement {
|
|
var lexpr = null;
|
|
if (!isEOS(this.peekToken())) {
|
|
lexpr = this.parseExpr();
|
|
}
|
|
return { command:'NEXT', lexpr:lexpr };
|
|
}
|
|
stmt__DIM() : DIM_Statement {
|
|
return { command:'DIM', args:this.parseVarOrIndexedList() };
|
|
}
|
|
stmt__INPUT() : INPUT_Statement {
|
|
var prompt = this.consumeToken();
|
|
var promptstr;
|
|
if (prompt.type == TokenType.String) {
|
|
this.expectToken(';');
|
|
promptstr = stripQuotes(prompt.str);
|
|
} else {
|
|
this.pushbackToken(prompt);
|
|
promptstr = "";
|
|
}
|
|
return { command:'INPUT', prompt:{ value: promptstr, $loc: prompt.$loc }, args:this.parseVarOrIndexedList() };
|
|
}
|
|
stmt__DATA() : DATA_Statement {
|
|
return { command:'DATA', datums:this.parseExprList() };
|
|
}
|
|
stmt__READ() {
|
|
return { command:'READ', args:this.parseVarOrIndexedList() };
|
|
}
|
|
stmt__RESTORE() {
|
|
return { command:'RESTORE' };
|
|
}
|
|
stmt__RETURN() {
|
|
return { command:'RETURN' };
|
|
}
|
|
stmt__STOP() {
|
|
return { command:'STOP' };
|
|
}
|
|
stmt__END() {
|
|
return { command:'END' };
|
|
}
|
|
stmt__ON() : ONGOTO_Statement {
|
|
var expr = this.parseExpr();
|
|
this.expectToken('GOTO');
|
|
var labels = this.parseLabelList();
|
|
return { command:'ONGOTO', expr:expr, labels:labels };
|
|
}
|
|
stmt__DEF() : DEF_Statement {
|
|
var lexpr = this.parseVarOrIndexed();
|
|
if (!lexpr.name.toUpperCase().startsWith('FN')) this.compileError(`Functions defined with DEF must begin with the letters "FN".`)
|
|
this.expectToken("=");
|
|
var func = this.parseExpr();
|
|
return { command:'DEF', lexpr:lexpr, def:func };
|
|
}
|
|
stmt__OPTION() : OPTION_Statement {
|
|
var tokname = this.consumeToken();
|
|
if (tokname.type != TokenType.Ident) this.compileError(`I expected a name after the OPTION statement.`)
|
|
var list : string[] = [];
|
|
var tok;
|
|
do {
|
|
tok = this.consumeToken();
|
|
if (isEOS(tok)) break;
|
|
list.push(tok.str.toUpperCase());
|
|
} while (true);
|
|
return { command:'OPTION', optname:tokname.str.toUpperCase(), optargs:list };
|
|
}
|
|
|
|
// for workermain
|
|
generateListing(file: string, program: BASICProgram) {
|
|
var srclines = [];
|
|
var pc = 0;
|
|
program.lines.forEach((line, idx) => {
|
|
srclines.push({offset: pc, line: idx+1});
|
|
pc += line.stmts.length;
|
|
});
|
|
return { lines: srclines };
|
|
}
|
|
getListings() : CodeListingMap {
|
|
return this.listings;
|
|
}
|
|
|
|
// LINT STUFF
|
|
checkLabels() {
|
|
for (let targ in this.targets) {
|
|
if (this.labels[targ] == null) {
|
|
this.compileError(`I couldn't find line number ${targ}`, this.targets[targ]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
///// BASIC DIALECTS
|
|
|
|
// TODO
|
|
|
|
export const ECMA55_MINIMAL : BASICOptions = {
|
|
uppercaseOnly : true,
|
|
strictVarNames : true,
|
|
sharedArrayNamespace : true,
|
|
defaultArrayBase : 0,
|
|
defaultArraySize : 11,
|
|
defaultValues : false,
|
|
stringConcat : false,
|
|
typeConvert : false,
|
|
maxDimensions : 2,
|
|
maxArguments : Infinity,
|
|
sparseArrays : false,
|
|
tickComments : false,
|
|
validKeywords : ['BASE','DATA','DEF','DIM','END',
|
|
'FOR','GO','GOSUB','GOTO','IF','INPUT','LET','NEXT','ON','OPTION','PRINT',
|
|
'RANDOMIZE','READ','REM','RESTORE','RETURN','STEP','STOP','SUB','THEN','TO'
|
|
],
|
|
validFunctions : ['ABS','ATN','COS','EXP','INT','LOG','RND','SGN','SIN','SQR','TAN'],
|
|
validOperators : ['=', '<>', '<', '>', '<=', '>=', '+', '-', '*', '/', '^'],
|
|
printZoneLength : 15,
|
|
printPrecision : 6,
|
|
checkOverflow : true,
|
|
}
|
|
|
|
export const ALTAIR_BASIC40 : BASICOptions = {
|
|
uppercaseOnly : true,
|
|
strictVarNames : true,
|
|
sharedArrayNamespace : true,
|
|
defaultArrayBase : 0,
|
|
defaultArraySize : 11,
|
|
defaultValues : false,
|
|
stringConcat : false,
|
|
typeConvert : false,
|
|
maxDimensions : 2,
|
|
maxArguments : Infinity,
|
|
sparseArrays : false,
|
|
tickComments : false,
|
|
validKeywords : null, // all
|
|
validFunctions : null, // all
|
|
validOperators : null, // all ['\\','MOD','NOT','AND','OR','XOR','EQV','IMP'],
|
|
printZoneLength : 15,
|
|
printPrecision : 6,
|
|
checkOverflow : true,
|
|
}
|