/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
import { normalize, posix, sep } from './path';
import { isWindows } from './platform';
import { startsWithIgnoreCase } from './strings';
/**
 * Takes a Windows OS path and changes backward slashes to forward slashes.
 * This should only be done for OS paths from Windows (or user provided paths potentially from Windows).
 * Using it on a Linux or MaxOS path might change it.
 */
export function toSlashes(osPath) {
    return osPath.replace(/[\\/]/g, posix.sep);
}
/**
 * Takes a Windows OS path (using backward or forward slashes) and turns it into a posix path:
 * - turns backward slashes into forward slashes
 * - makes it absolute if it starts with a drive letter
 * This should only be done for OS paths from Windows (or user provided paths potentially from Windows).
 * Using it on a Linux or MaxOS path might change it.
 */
export function toPosixPath(osPath) {
    if (osPath.indexOf('/') === -1) {
        osPath = toSlashes(osPath);
    }
    if (/^[a-zA-Z]:(\/|$)/.test(osPath)) { // starts with a drive letter
        osPath = '/' + osPath;
    }
    return osPath;
}
export function isEqualOrParent(base, parentCandidate, ignoreCase, separator = sep) {
    if (base === parentCandidate) {
        return true;
    }
    if (!base || !parentCandidate) {
        return false;
    }
    if (parentCandidate.length > base.length) {
        return false;
    }
    if (ignoreCase) {
        const beginsWith = startsWithIgnoreCase(base, parentCandidate);
        if (!beginsWith) {
            return false;
        }
        if (parentCandidate.length === base.length) {
            return true; // same path, different casing
        }
        let sepOffset = parentCandidate.length;
        if (parentCandidate.charAt(parentCandidate.length - 1) === separator) {
            sepOffset--; // adjust the expected sep offset in case our candidate already ends in separator character
        }
        return base.charAt(sepOffset) === separator;
    }
    if (parentCandidate.charAt(parentCandidate.length - 1) !== separator) {
        parentCandidate += separator;
    }
    return base.indexOf(parentCandidate) === 0;
}
export function isWindowsDriveLetter(char0) {
    return char0 >= 65 /* A */ && char0 <= 90 /* Z */ || char0 >= 97 /* a */ && char0 <= 122 /* z */;
}
export function isRootOrDriveLetter(path) {
    const pathNormalized = normalize(path);
    if (isWindows) {
        if (path.length > 3) {
            return false;
        }
        return hasDriveLetter(pathNormalized) &&
            (path.length === 2 || pathNormalized.charCodeAt(2) === 92 /* Backslash */);
    }
    return pathNormalized === posix.sep;
}
export function hasDriveLetter(path, continueAsWindows) {
    const isWindowsPath = ((continueAsWindows !== undefined) ? continueAsWindows : isWindows);
    if (isWindowsPath) {
        return isWindowsDriveLetter(path.charCodeAt(0)) && path.charCodeAt(1) === 58 /* Colon */;
    }
    return false;
}
