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

A common library for media playback in JavaScript

import { BARE_ITEM } from '../utils/BARE_ITEM.js';
import { parseBoolean } from './parseBoolean.js';
import { parseByteSequence } from './parseByteSequence.js';
import { parseDate } from './parseDate.js';
import { parseError } from './parseError.js';
import { parseIntegerOrDecimal } from './parseIntegerOrDecimal.js';
import { parseString } from './parseString.js';
import { parseToken } from './parseToken.js';
// 4.2.3.1.  Parsing a Bare Item
//
// Given an ASCII string as input_string, return a bare Item.
// input_string is modified to remove the parsed value.
//
// 1.  If the first character of input_string is a "-" or a DIGIT,
//     return the result of running Parsing an Integer or Decimal
//     (Section 4.2.4) with input_string.
//
// 2.  If the first character of input_string is a DQUOTE, return the
//     result of running Parsing a String (Section 4.2.5) with
//     input_string.
//
// 3.  If the first character of input_string is ":", return the result
//     of running Parsing a Byte Sequence (Section 4.2.7) with
//     input_string.
//
// 4.  If the first character of input_string is "?", return the result
//     of running Parsing a Boolean (Section 4.2.8) with input_string.
//
// 5.  If the first character of input_string is an ALPHA or "*", return
//     the result of running Parsing a Token (Section 4.2.6) with
//     input_string.
//
// 6.  If the first character of input_string is "@", return the result
//     of running Parsing a Date (Section 4.2.9) with input_string.
//
// 7.  Otherwise, the item type is unrecognized; fail parsing.
export function parseBareItem(src, options) {
    const first = src[0];
    if (first === `"`) {
        return parseString(src);
    }
    if (/^[-0-9]/.test(first)) {
        return parseIntegerOrDecimal(src);
    }
    if (first === `?`) {
        return parseBoolean(src);
    }
    if (first === `:`) {
        return parseByteSequence(src);
    }
    if (/^[a-zA-Z*]/.test(first)) {
        return parseToken(src, options);
    }
    if (first === `@`) {
        return parseDate(src);
    }
    throw parseError(src, BARE_ITEM);
}
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