app/node_modules/@babylonjs/core/Misc/andOrNotEvaluator.js

/**
 * Class used to evaluate queries containing `and` and `or` operators
 */
export class AndOrNotEvaluator {
    /**
     * Evaluate a query
     * @param query defines the query to evaluate
     * @param evaluateCallback defines the callback used to filter result
     * @returns true if the query matches
     */
    static Eval(query, evaluateCallback) {
        if (!query.match(/\([^()]*\)/g)) {
            query = AndOrNotEvaluator._HandleParenthesisContent(query, evaluateCallback);
        }
        else {
            query = query.replace(/\([^()]*\)/g, (r) => {
                // remove parenthesis
                r = r.slice(1, r.length - 1);
                return AndOrNotEvaluator._HandleParenthesisContent(r, evaluateCallback);
            });
        }
        if (query === "true") {
            return true;
        }
        if (query === "false") {
            return false;
        }
        return AndOrNotEvaluator.Eval(query, evaluateCallback);
    }
    static _HandleParenthesisContent(parenthesisContent, evaluateCallback) {
        evaluateCallback =
            evaluateCallback ||
                ((r) => {
                    return r === "true" ? true : false;
                });
        let result;
        const or = parenthesisContent.split("||");
        for (const i in or) {
            if (Object.prototype.hasOwnProperty.call(or, i)) {
                let ori = AndOrNotEvaluator._SimplifyNegation(or[i].trim());
                const and = ori.split("&&");
                if (and.length > 1) {
                    for (let j = 0; j < and.length; ++j) {
                        const andj = AndOrNotEvaluator._SimplifyNegation(and[j].trim());
                        if (andj !== "true" && andj !== "false") {
                            if (andj[0] === "!") {
                                result = !evaluateCallback(andj.substring(1));
                            }
                            else {
                                result = evaluateCallback(andj);
                            }
                        }
                        else {
                            result = andj === "true" ? true : false;
                        }
                        if (!result) {
                            // no need to continue since 'false && ... && ...' will always return false
                            ori = "false";
                            break;
                        }
                    }
                }
                if (result || ori === "true") {
                    // no need to continue since 'true || ... || ...' will always return true
                    result = true;
                    break;
                }
                // result equals false (or undefined)
                if (ori !== "true" && ori !== "false") {
                    if (ori[0] === "!") {
                        result = !evaluateCallback(ori.substring(1));
                    }
                    else {
                        result = evaluateCallback(ori);
                    }
                }
                else {
                    result = ori === "true" ? true : false;
                }
            }
        }
        // the whole parenthesis scope is replaced by 'true' or 'false'
        return result ? "true" : "false";
    }
    static _SimplifyNegation(booleanString) {
        booleanString = booleanString.replace(/^[\s!]+/, (r) => {
            // remove whitespaces
            r = r.replace(/[\s]/g, () => "");
            return r.length % 2 ? "!" : "";
        });
        booleanString = booleanString.trim();
        if (booleanString === "!true") {
            booleanString = "false";
        }
        else if (booleanString === "!false") {
            booleanString = "true";
        }
        return booleanString;
    }
}
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