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

A common library for media playback in JavaScript

import { BOOLEAN } from '../utils/BOOLEAN.js';
import { parsedValue } from './ParsedValue.js';
import { parseError } from './parseError.js';
// 4.2.8.  Parsing a Boolean
//
// Given an ASCII string as input_string, return a Boolean. input_string
// is modified to remove the parsed value.
//
// 1.  If the first character of input_string is not "?", fail parsing.
//
// 2.  Discard the first character of input_string.
//
// 3.  If the first character of input_string matches "1", discard the
//     first character, and return true.
//
// 4.  If the first character of input_string matches "0", discard the
//     first character, and return false.
//
// 5.  No value has matched; fail parsing.
export function parseBoolean(src) {
    let i = 0;
    if (src[i] !== '?') {
        throw parseError(src, BOOLEAN);
    }
    i++;
    if (src[i] === '1') {
        return parsedValue(true, src.substring(++i));
    }
    if (src[i] === '0') {
        return parsedValue(false, src.substring(++i));
    }
    throw parseError(src, BOOLEAN);
}
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