4nm/dist/parsing/json.js

TypeScript reimplementation of Telegram's official library for communicating with Telegram Web Apps.

import { toRGBExt } from '../colors';
export function createJSONStructParser(schema, optional) {
    return value => {
        if (value === null || value === undefined) {
            if (optional) {
                return;
            }
            throw new TypeError(`Unable to parse value as JSON as it is empty (null or undefined).`);
        }
        let json = value;
        // Convert value to JSON in case, it is string. We expect value to be
        // JSON string.
        if (typeof json === 'string') {
            try {
                json = JSON.parse(json);
            }
            catch (e) {
                throw new SyntaxError(`Unable to parse value "${value}" as JSON as long as value is not JSON string.`);
            }
        }
        // We expect json to usual object.
        if (typeof json !== 'object' || json === null || Array.isArray(json)) {
            throw new TypeError(`Unable to value "${value}" as JSON as long as value is not JSON object.`);
        }
        // Iterate over each schema property and extract it from JSON.
        const result = {};
        for (const prop in schema) {
            const [paramName, parser] = schema[prop];
            try {
                const value = parser(json[paramName]);
                if (value !== undefined) {
                    result[prop] = value;
                }
            }
            catch (e) {
                throw new Error(`Unable to parse parameter "${paramName}"`, { cause: e });
            }
        }
        return result;
    };
}
/**
 * Converts value received from some JSON to string.
 * @param value - raw value.
 * @throws {TypeError} Value has incorrect type.
 */
export const parseJSONParamAsInt = value => {
    if (typeof value !== 'number') {
        throw new TypeError(`Unable to value "${value}" as int`);
    }
    return value;
};
/**
 * Converts value received from some JSON to string.
 * @param value - raw value.
 * @throws {TypeError} Value has incorrect type.
 */
export const parseJSONParamAsString = value => {
    if (typeof value !== 'string') {
        throw new TypeError(`Unable to value "${value}" as string`);
    }
    return value;
};
/**
 * Converts value received from some JSON to string or undefined.
 * @param value - raw value.
 * @throws {TypeError} Value has incorrect type.
 */
export const parseJSONParamAsOptString = value => value === undefined ? value : parseJSONParamAsString(value);
/**
 * Converts value received from some JSON to RGB in full format or undefined.
 * @param value - raw value.
 * @throws {TypeError} Value has incorrect type.
 */
export const parseJSONParamAsOptRGBExt = value => value === undefined ? value : toRGBExt(parseJSONParamAsString(value));
/**
 * Converts value received from some JSON to boolean or undefined.
 * @param value - raw value.
 * @throws {TypeError} Value has incorrect type.
 */
export const parseJSONParamAsOptBool = value => {
    if (value === undefined) {
        return;
    }
    if (typeof value !== 'boolean') {
        throw new TypeError(`Unable to value "${value}" as boolean`);
    }
    return value;
};