@svta/common-media-library/dist/structuredfield/parse/parseKey.js

A common library for media playback in JavaScript

import { KEY } from '../utils/KEY.js';
import { parsedValue } from './ParsedValue.js';
import { parseError } from './parseError.js';
// 4.2.3.3.  Parsing a Key
//
// Given an ASCII string as input_string, return a key. input_string is
// modified to remove the parsed value.
//
// 1.  If the first character of input_string is not lcalpha or "*",
//     fail parsing.
//
// 2.  Let output_string be an empty string.
//
// 3.  While input_string is not empty:
//
//     1.  If the first character of input_string is not one of lcalpha,
//         DIGIT, "_", "-", ".", or "*", return output_string.
//
//     2.  Let char be the result of consuming the first character of
//         input_string.
//
//     3.  Append char to output_string.
//
// 4.  Return output_string.
export function parseKey(src) {
    let i = 0;
    if (/^[a-z*]$/.test(src[i]) === false) {
        throw parseError(src, KEY);
    }
    let value = '';
    while (src.length > i) {
        if (/^[a-z0-9_\-.*]$/.test(src[i]) === false) {
            return parsedValue(value, src.substring(i));
        }
        value += src[i];
        i++;
    }
    return parsedValue(value, src.substring(i));
}
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