Function startsWithPrefixAt

packages/queryLanguage/src/tokens.ts:110–117

* Checks if the input at the given offset starts with a prefix keyword.

(input: InputStream, offset: number)

 * Checks if the input at the given offset starts with a prefix keyword.
 */
function startsWithPrefixAt(input: InputStream, offset: number): boolean {
    for (const prefix of PREFIXES) {
        if (matchesStringAt(input, offset, prefix)) {
            return true;
        }
    }
    return false;
}

/**
 * Advances past whitespace starting at the given offset.