'use strict';

/**
 * Check if `vhost` is a valid suffix of `hostname` (top-domain)
 *
 * It means that `vhost` needs to be a suffix of `hostname` and we then need to
 * make sure that: either they are equal, or the character preceding `vhost` in
 * `hostname` is a '.' (it should not be a partial label).
 *
 * * hostname = 'not.evil.com' and vhost = 'vil.com'      => not ok
 * * hostname = 'not.evil.com' and vhost = 'evil.com'     => ok
 * * hostname = 'not.evil.com' and vhost = 'not.evil.com' => ok
 */
function shareSameDomainSuffix(hostname, vhost) {
    if (hostname.endsWith(vhost)) {
        return (hostname.length === vhost.length ||
            hostname[hostname.length - vhost.length - 1] === '.');
    }
    return false;
}
/**
 * Given a hostname and its public suffix, extract the general domain.
 */
function extractDomainWithSuffix(hostname, publicSuffix) {
    // Locate the index of the last '.' in the part of the `hostname` preceding
    // the public suffix.
    //
    // examples:
    //   1. not.evil.co.uk  => evil.co.uk
    //         ^    ^
    //         |    | start of public suffix
    //         | index of the last dot
    //
    //   2. example.co.uk   => example.co.uk
    //     ^       ^
    //     |       | start of public suffix
    //     |
    //     | (-1) no dot found before the public suffix
    const publicSuffixIndex = hostname.length - publicSuffix.length - 2;
    const lastDotBeforeSuffixIndex = hostname.lastIndexOf('.', publicSuffixIndex);
    // No '.' found, then `hostname` is the general domain (no sub-domain)
    if (lastDotBeforeSuffixIndex === -1) {
        return hostname;
    }
    // Extract the part between the last '.'
    return hostname.slice(lastDotBeforeSuffixIndex + 1);
}
/**
 * Detects the domain based on rules and upon and a host string
 */
function getDomain(suffix, hostname, options) {
    // Check if `hostname` ends with a member of `validHosts`.
    if (options.validHosts !== null) {
        const validHosts = options.validHosts;
        for (const vhost of validHosts) {
            if ( /*@__INLINE__*/shareSameDomainSuffix(hostname, vhost)) {
                return vhost;
            }
        }
    }
    let numberOfLeadingDots = 0;
    if (hostname.startsWith('.')) {
        while (numberOfLeadingDots < hostname.length &&
            hostname[numberOfLeadingDots] === '.') {
            numberOfLeadingDots += 1;
        }
    }
    // If `hostname` is a valid public suffix, then there is no domain to return.
    // Since we already know that `getPublicSuffix` returns a suffix of `hostname`
    // there is no need to perform a string comparison and we only compare the
    // size.
    if (suffix.length === hostname.length - numberOfLeadingDots) {
        return null;
    }
    // To extract the general domain, we start by identifying the public suffix
    // (if any), then consider the domain to be the public suffix with one added
    // level of depth. (e.g.: if hostname is `not.evil.co.uk` and public suffix:
    // `co.uk`, then we take one more level: `evil`, giving the final result:
    // `evil.co.uk`).
    return /*@__INLINE__*/ extractDomainWithSuffix(hostname, suffix);
}

/**
 * Return the part of domain without suffix.
 *
 * Example: for domain 'foo.com', the result would be 'foo'.
 */
function getDomainWithoutSuffix(domain, suffix) {
    // Note: here `domain` and `suffix` cannot have the same length because in
    // this case we set `domain` to `null` instead. It is thus safe to assume
    // that `suffix` is shorter than `domain`.
    return domain.slice(0, -suffix.length - 1);
}

/**
 * @param url - URL we want to extract a hostname from.
 * @param urlIsValidHostname - hint from caller; true if `url` is already a valid hostname.
 */
function extractHostname(url, urlIsValidHostname) {
    let start = 0;
    let end = url.length;
    let hasUpper = false;
    // If url is not already a valid hostname, then try to extract hostname.
    if (!urlIsValidHostname) {
        // Special handling of data URLs
        if (url.startsWith('data:')) {
            return null;
        }
        // Trim leading spaces
        while (start < url.length && url.charCodeAt(start) <= 32) {
            start += 1;
        }
        // Trim trailing spaces
        while (end > start + 1 && url.charCodeAt(end - 1) <= 32) {
            end -= 1;
        }
        // Skip scheme.
        if (url.charCodeAt(start) === 47 /* '/' */ &&
            url.charCodeAt(start + 1) === 47 /* '/' */) {
            start += 2;
        }
        else {
            const indexOfProtocol = url.indexOf(':/', start);
            if (indexOfProtocol !== -1) {
                // Implement fast-path for common protocols. We expect most protocols
                // should be one of these 4 and thus we will not need to perform the
                // more expansive validity check most of the time.
                const protocolSize = indexOfProtocol - start;
                const c0 = url.charCodeAt(start);
                const c1 = url.charCodeAt(start + 1);
                const c2 = url.charCodeAt(start + 2);
                const c3 = url.charCodeAt(start + 3);
                const c4 = url.charCodeAt(start + 4);
                if (protocolSize === 5 &&
                    c0 === 104 /* 'h' */ &&
                    c1 === 116 /* 't' */ &&
                    c2 === 116 /* 't' */ &&
                    c3 === 112 /* 'p' */ &&
                    c4 === 115 /* 's' */) ;
                else if (protocolSize === 4 &&
                    c0 === 104 /* 'h' */ &&
                    c1 === 116 /* 't' */ &&
                    c2 === 116 /* 't' */ &&
                    c3 === 112 /* 'p' */) ;
                else if (protocolSize === 3 &&
                    c0 === 119 /* 'w' */ &&
                    c1 === 115 /* 's' */ &&
                    c2 === 115 /* 's' */) ;
                else if (protocolSize === 2 &&
                    c0 === 119 /* 'w' */ &&
                    c1 === 115 /* 's' */) ;
                else {
                    // Check that scheme is valid
                    for (let i = start; i < indexOfProtocol; i += 1) {
                        const lowerCaseCode = url.charCodeAt(i) | 32;
                        if (!(((lowerCaseCode >= 97 && lowerCaseCode <= 122) || // [a, z]
                            (lowerCaseCode >= 48 && lowerCaseCode <= 57) || // [0, 9]
                            lowerCaseCode === 46 || // '.'
                            lowerCaseCode === 45 || // '-'
                            lowerCaseCode === 43) // '+'
                        )) {
                            return null;
                        }
                    }
                }
                // Skip 0, 1 or more '/' after ':/'
                start = indexOfProtocol + 2;
                while (url.charCodeAt(start) === 47 /* '/' */) {
                    start += 1;
                }
            }
        }
        // Detect first occurrence of '/', '?' or '#'. We also keep track of the
        // last occurrence of '@', ']' or ':' to speed-up subsequent parsing of
        // (respectively), identifier, ipv6 or port.
        let indexOfIdentifier = -1;
        let indexOfClosingBracket = -1;
        let indexOfPort = -1;
        for (let i = start; i < end; i += 1) {
            const code = url.charCodeAt(i);
            if (code === 35 || // '#'
                code === 47 || // '/'
                code === 63 // '?'
            ) {
                end = i;
                break;
            }
            else if (code === 64) {
                // '@'
                indexOfIdentifier = i;
            }
            else if (code === 93) {
                // ']'
                indexOfClosingBracket = i;
            }
            else if (code === 58) {
                // ':'
                indexOfPort = i;
            }
            else if (code >= 65 && code <= 90) {
                hasUpper = true;
            }
        }
        // Detect identifier: '@'
        if (indexOfIdentifier !== -1 &&
            indexOfIdentifier > start &&
            indexOfIdentifier < end) {
            start = indexOfIdentifier + 1;
        }
        // Handle ipv6 addresses
        if (url.charCodeAt(start) === 91 /* '[' */) {
            if (indexOfClosingBracket !== -1) {
                return url.slice(start + 1, indexOfClosingBracket).toLowerCase();
            }
            return null;
        }
        else if (indexOfPort !== -1 && indexOfPort > start && indexOfPort < end) {
            // Detect port: ':'
            end = indexOfPort;
        }
    }
    // Trim trailing dots
    while (end > start + 1 && url.charCodeAt(end - 1) === 46 /* '.' */) {
        end -= 1;
    }
    const hostname = start !== 0 || end !== url.length ? url.slice(start, end) : url;
    if (hasUpper) {
        return hostname.toLowerCase();
    }
    return hostname;
}

/**
 * Check if a hostname is an IP. You should be aware that this only works
 * because `hostname` is already garanteed to be a valid hostname!
 */
function isProbablyIpv4(hostname) {
    // Cannot be shorted than 1.1.1.1
    if (hostname.length < 7) {
        return false;
    }
    // Cannot be longer than: 255.255.255.255
    if (hostname.length > 15) {
        return false;
    }
    let numberOfDots = 0;
    for (let i = 0; i < hostname.length; i += 1) {
        const code = hostname.charCodeAt(i);
        if (code === 46 /* '.' */) {
            numberOfDots += 1;
        }
        else if (code < 48 /* '0' */ || code > 57 /* '9' */) {
            return false;
        }
    }
    return (numberOfDots === 3 &&
        hostname.charCodeAt(0) !== 46 /* '.' */ &&
        hostname.charCodeAt(hostname.length - 1) !== 46 /* '.' */);
}
/**
 * Similar to isProbablyIpv4.
 */
function isProbablyIpv6(hostname) {
    if (hostname.length < 3) {
        return false;
    }
    let start = hostname.startsWith('[') ? 1 : 0;
    let end = hostname.length;
    if (hostname[end - 1] === ']') {
        end -= 1;
    }
    // We only consider the maximum size of a normal IPV6. Note that this will
    // fail on so-called "IPv4 mapped IPv6 addresses" but this is a corner-case
    // and a proper validation library should be used for these.
    if (end - start > 39) {
        return false;
    }
    let hasColon = false;
    for (; start < end; start += 1) {
        const code = hostname.charCodeAt(start);
        if (code === 58 /* ':' */) {
            hasColon = true;
        }
        else if (!(((code >= 48 && code <= 57) || // 0-9
            (code >= 97 && code <= 102) || // a-f
            (code >= 65 && code <= 90)) // A-F
        )) {
            return false;
        }
    }
    return hasColon;
}
/**
 * Check if `hostname` is *probably* a valid ip addr (either ipv6 or ipv4).
 * This *will not* work on any string. We need `hostname` to be a valid
 * hostname.
 */
function isIp(hostname) {
    return isProbablyIpv6(hostname) || isProbablyIpv4(hostname);
}

/**
 * Implements fast shallow verification of hostnames. This does not perform a
 * struct check on the content of labels (classes of Unicode characters, etc.)
 * but instead check that the structure is valid (number of labels, length of
 * labels, etc.).
 *
 * If you need stricter validation, consider using an external library.
 */
function isValidAscii(code) {
    return ((code >= 97 && code <= 122) || (code >= 48 && code <= 57) || code > 127);
}
/**
 * Check if a hostname string is valid. It's usually a preliminary check before
 * trying to use getDomain or anything else.
 *
 * Beware: it does not check if the TLD exists.
 */
function isValidHostname (hostname) {
    if (hostname.length > 255) {
        return false;
    }
    if (hostname.length === 0) {
        return false;
    }
    if (
    /*@__INLINE__*/ !isValidAscii(hostname.charCodeAt(0)) &&
        hostname.charCodeAt(0) !== 46 && // '.' (dot)
        hostname.charCodeAt(0) !== 95 // '_' (underscore)
    ) {
        return false;
    }
    // Validate hostname according to RFC
    let lastDotIndex = -1;
    let lastCharCode = -1;
    const len = hostname.length;
    for (let i = 0; i < len; i += 1) {
        const code = hostname.charCodeAt(i);
        if (code === 46 /* '.' */) {
            if (
            // Check that previous label is < 63 bytes long (64 = 63 + '.')
            i - lastDotIndex > 64 ||
                // Check that previous character was not already a '.'
                lastCharCode === 46 ||
                // Check that the previous label does not end with a '-' (dash)
                lastCharCode === 45 ||
                // Check that the previous label does not end with a '_' (underscore)
                lastCharCode === 95) {
                return false;
            }
            lastDotIndex = i;
        }
        else if (!( /*@__INLINE__*/(isValidAscii(code) || code === 45 || code === 95))) {
            // Check if there is a forbidden character in the label
            return false;
        }
        lastCharCode = code;
    }
    return (
    // Check that last label is shorter than 63 chars
    len - lastDotIndex - 1 <= 63 &&
        // Check that the last character is an allowed trailing label character.
        // Since we already checked that the char is a valid hostname character,
        // we only need to check that it's different from '-'.
        lastCharCode !== 45);
}

function setDefaultsImpl({ allowIcannDomains = true, allowPrivateDomains = false, detectIp = true, extractHostname = true, mixedInputs = true, validHosts = null, validateHostname = true, }) {
    return {
        allowIcannDomains,
        allowPrivateDomains,
        detectIp,
        extractHostname,
        mixedInputs,
        validHosts,
        validateHostname,
    };
}
const DEFAULT_OPTIONS = /*@__INLINE__*/ setDefaultsImpl({});
function setDefaults(options) {
    if (options === undefined) {
        return DEFAULT_OPTIONS;
    }
    return /*@__INLINE__*/ setDefaultsImpl(options);
}

/**
 * Returns the subdomain of a hostname string
 */
function getSubdomain(hostname, domain) {
    // If `hostname` and `domain` are the same, then there is no sub-domain
    if (domain.length === hostname.length) {
        return '';
    }
    return hostname.slice(0, -domain.length - 1);
}

/**
 * Implement a factory allowing to plug different implementations of suffix
 * lookup (e.g.: using a trie or the packed hashes datastructures). This is used
 * and exposed in `tldts.ts` and `tldts-experimental.ts` bundle entrypoints.
 */
function getEmptyResult() {
    return {
        domain: null,
        domainWithoutSuffix: null,
        hostname: null,
        isIcann: null,
        isIp: null,
        isPrivate: null,
        publicSuffix: null,
        subdomain: null,
    };
}
function resetResult(result) {
    result.domain = null;
    result.domainWithoutSuffix = null;
    result.hostname = null;
    result.isIcann = null;
    result.isIp = null;
    result.isPrivate = null;
    result.publicSuffix = null;
    result.subdomain = null;
}
function parseImpl(url, step, suffixLookup, partialOptions, result) {
    const options = /*@__INLINE__*/ setDefaults(partialOptions);
    // Very fast approximate check to make sure `url` is a string. This is needed
    // because the library will not necessarily be used in a typed setup and
    // values of arbitrary types might be given as argument.
    if (typeof url !== 'string') {
        return result;
    }
    // Extract hostname from `url` only if needed. This can be made optional
    // using `options.extractHostname`. This option will typically be used
    // whenever we are sure the inputs to `parse` are already hostnames and not
    // arbitrary URLs.
    //
    // `mixedInput` allows to specify if we expect a mix of URLs and hostnames
    // as input. If only hostnames are expected then `extractHostname` can be
    // set to `false` to speed-up parsing. If only URLs are expected then
    // `mixedInputs` can be set to `false`. The `mixedInputs` is only a hint
    // and will not change the behavior of the library.
    if (!options.extractHostname) {
        result.hostname = url;
    }
    else if (options.mixedInputs) {
        result.hostname = extractHostname(url, isValidHostname(url));
    }
    else {
        result.hostname = extractHostname(url, false);
    }
    // Check if `hostname` is a valid ip address
    if (options.detectIp && result.hostname !== null) {
        result.isIp = isIp(result.hostname);
        if (result.isIp) {
            return result;
        }
    }
    // Perform hostname validation if enabled. If hostname is not valid, no need to
    // go further as there will be no valid domain or sub-domain. This validation
    // is applied before any early returns to ensure consistent behavior across
    // all API methods including getHostname().
    if (options.validateHostname &&
        options.extractHostname &&
        result.hostname !== null &&
        !isValidHostname(result.hostname)) {
        result.hostname = null;
        return result;
    }
    if (step === 0 /* FLAG.HOSTNAME */ || result.hostname === null) {
        return result;
    }
    // Extract public suffix
    suffixLookup(result.hostname, options, result);
    if (step === 2 /* FLAG.PUBLIC_SUFFIX */ || result.publicSuffix === null) {
        return result;
    }
    // Extract domain
    result.domain = getDomain(result.publicSuffix, result.hostname, options);
    if (step === 3 /* FLAG.DOMAIN */ || result.domain === null) {
        return result;
    }
    // Extract subdomain
    result.subdomain = getSubdomain(result.hostname, result.domain);
    if (step === 4 /* FLAG.SUB_DOMAIN */) {
        return result;
    }
    // Extract domain without suffix
    result.domainWithoutSuffix = getDomainWithoutSuffix(result.domain, result.publicSuffix);
    return result;
}

function fastPath (hostname, options, out) {
    // Fast path for very popular suffixes; this allows to by-pass lookup
    // completely as well as any extra allocation or string manipulation.
    if (!options.allowPrivateDomains && hostname.length > 3) {
        const last = hostname.length - 1;
        const c3 = hostname.charCodeAt(last);
        const c2 = hostname.charCodeAt(last - 1);
        const c1 = hostname.charCodeAt(last - 2);
        const c0 = hostname.charCodeAt(last - 3);
        if (c3 === 109 /* 'm' */ &&
            c2 === 111 /* 'o' */ &&
            c1 === 99 /* 'c' */ &&
            c0 === 46 /* '.' */) {
            out.isIcann = true;
            out.isPrivate = false;
            out.publicSuffix = 'com';
            return true;
        }
        else if (c3 === 103 /* 'g' */ &&
            c2 === 114 /* 'r' */ &&
            c1 === 111 /* 'o' */ &&
            c0 === 46 /* '.' */) {
            out.isIcann = true;
            out.isPrivate = false;
            out.publicSuffix = 'org';
            return true;
        }
        else if (c3 === 117 /* 'u' */ &&
            c2 === 100 /* 'd' */ &&
            c1 === 101 /* 'e' */ &&
            c0 === 46 /* '.' */) {
            out.isIcann = true;
            out.isPrivate = false;
            out.publicSuffix = 'edu';
            return true;
        }
        else if (c3 === 118 /* 'v' */ &&
            c2 === 111 /* 'o' */ &&
            c1 === 103 /* 'g' */ &&
            c0 === 46 /* '.' */) {
            out.isIcann = true;
            out.isPrivate = false;
            out.publicSuffix = 'gov';
            return true;
        }
        else if (c3 === 116 /* 't' */ &&
            c2 === 101 /* 'e' */ &&
            c1 === 110 /* 'n' */ &&
            c0 === 46 /* '.' */) {
            out.isIcann = true;
            out.isPrivate = false;
            out.publicSuffix = 'net';
            return true;
        }
        else if (c3 === 101 /* 'e' */ &&
            c2 === 100 /* 'd' */ &&
            c1 === 46 /* '.' */) {
            out.isIcann = true;
            out.isPrivate = false;
            out.publicSuffix = 'de';
            return true;
        }
    }
    return false;
}

exports.fastPathLookup = fastPath;
exports.getEmptyResult = getEmptyResult;
exports.parseImpl = parseImpl;
exports.resetResult = resetResult;
exports.setDefaults = setDefaults;
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