Method valueOf

src/backend/mi_parse.ts:63–122

(start: any, path: string)

    public output: string = '';

    public static valueOf(start: any, path: string): any {
        if (!start) {
            return undefined;
        }
        const pathRegex = /^\.?([a-zA-Z_\-][a-zA-Z0-9_\-]*)/;
        const indexRegex = /^\[(\d+)\](?:$|\.)/;
        path = path.trim();
        if (!path) { return start; }
        let current = start;
        do {
            let target = pathRegex.exec(path);
            if (target) {
                path = path.substr(target[0].length);
                if (current.length && typeof current !== 'string') {
                    const found = [];
                    for (const element of current) {
                        if (element[0] === target[1]) {
                            found.push(element[1]);
                        }
                    }
                    if (found.length > 1) {
                        current = found;
                    }
                    else if (found.length === 1) {
                        current = found[0];
                    }
                    else {
                        return undefined;
                    }
                }
                else {
                    return undefined;
                }
            }
            else if (path[0] === '@') {
                current = [current];
                path = path.substr(1);
            }
            else {
                target = indexRegex.exec(path);
                if (target) {
                    path = path.substr(target[0].length);
                    const i = parseInt(target[1]);
                    if (current.length && typeof current !== 'string' && i >= 0 && i < current.length) {
                        current = current[i];
                    }
                    else if (i === 0) {
                    }
                    else {
                        return undefined;
                    }
                }
                else {
                    return undefined;
                }
            }
            path = path.trim();
        } while (path);