68kcounter/dist/parse/evaluate.js

68000 ASM source code cycle counter

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
const expEval = __importStar(require("expression-eval"));
/**
 * Try to evaluate an ASM expression to a numeric value.
 *
 * @param expression Text value
 * @param vars Optional variables to substitute in expression
 */
function evaluate(expression, vars = {}) {
    // Transform ASM expression syntax to be compatible with `expression-eval`
    const preprocessed = expression
        // Remove immediate prefix
        .replace(/^#/, "")
        // Hex
        .replace(/\$([0-9a-f]+)/gi, (_, p1) => eval("0x" + p1))
        // Binary
        .replace(/%([0-1]+)/gi, (_, p1) => eval("0b" + p1))
        // Octal
        .replace(/@([0-7]+)/gi, (_, p1) => eval("0o" + p1))
        // OR
        .replace(/(?<=[a-z0-9_])!(?=[a-z0-9_])/g, "|")
        // XOR
        .replace(/(?<=[a-z0-9_])~(?=[a-z0-9_])/g, "^");
    try {
        const ast = expEval.parse(preprocessed);
        return expEval.eval(ast, vars);
    }
    catch (e) {
        // ignore
    }
}
exports.default = evaluate;