You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
53 lines
1.1 KiB
53 lines
1.1 KiB
3 years ago
|
/**
|
||
|
|
* Formula parser
|
||
|
|
*/
|
||
|
|
export class Parser<T extends (string | number)> {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Create a new formula parser.
|
||
|
|
*
|
||
|
|
* @param formula - the formula string to parse.
|
||
|
|
* @param options - optional settings.
|
||
|
|
*/
|
||
|
|
constructor(formula: string, options?: Options);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Evaluate the formula.
|
||
|
|
*
|
||
|
|
* @param context - optional object with runtime formula context used to resolve variables.
|
||
|
|
*
|
||
|
|
* @returns the string or number outcome of the resolved formula.
|
||
|
|
*/
|
||
|
|
evaluate(context?: any): T;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
export interface Options {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A hash of key - value pairs used to convert constants to values.
|
||
|
|
*/
|
||
|
|
readonly constants?: Record<string, any>;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A regular expression used to validate token variables.
|
||
|
|
*/
|
||
|
|
readonly tokenRx?: RegExp;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A variable resolver factory function.
|
||
|
|
*/
|
||
|
|
readonly reference?: Options.Reference;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A hash of key-value pairs used to resolve formula functions.
|
||
|
|
*/
|
||
|
|
readonly functions?: Record<string, Function>;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
export namespace Options {
|
||
|
|
|
||
|
|
type Reference = (name: string) => (context: any) => any;
|
||
|
|
}
|