const QUOTE_MARKS = new Set(['"', "'"]);

const WORD_BREAKS = new Set([" ", "\t"]);

export const contains = function contains(haystack: string, needle: string): boolean {
    return haystack.includes(needle);
};

const flushed = function flushed(words: readonly string[], current: string): string[] {
    return current.length > 0 ? [...words, current] : [...words];
};

export const splitWords = function splitWords(text: string): string[] {
    let words: string[] = [];
    let current = "";
    let quote = "";

    for (const char of text) {
        if (quote !== "") {
            quote = char === quote ? "" : quote;
            current += quote === "" ? "" : char;
        } else if (QUOTE_MARKS.has(char)) {
            quote = char;
        } else if (WORD_BREAKS.has(char)) {
            words = flushed(words, current);
            current = "";
        } else {
            current += char;
        }
    }

    return flushed(words, current);
};

export const hasPrefix = function hasPrefix(text: string, prefix: string): boolean {
    return text.startsWith(prefix);
};