// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
import { isWindows, osType } from "../_util/os.ts";
import { SEP, SEP_PATTERN } from "./separator.ts";
import * as _win32 from "./win32.ts";
import * as _posix from "./posix.ts";
const path = isWindows ? _win32 : _posix;
const { join , normalize  } = path;
const regExpEscapeChars = [
    "!",
    "$",
    "(",
    ")",
    "*",
    "+",
    ".",
    "=",
    "?",
    "[",
    "\\",
    "^",
    "{",
    "|"
];
const rangeEscapeChars = [
    "-",
    "\\",
    "]"
];
/** Convert a glob string to a regular expression.
 *
 * Tries to match bash glob expansion as closely as possible.
 *
 * Basic glob syntax:
 * - `*` - Matches everything without leaving the path segment.
 * - `?` - Matches any single character.
 * - `{foo,bar}` - Matches `foo` or `bar`.
 * - `[abcd]` - Matches `a`, `b`, `c` or `d`.
 * - `[a-d]` - Matches `a`, `b`, `c` or `d`.
 * - `[!abcd]` - Matches any single character besides `a`, `b`, `c` or `d`.
 * - `[[:<class>:]]` - Matches any character belonging to `<class>`.
 *     - `[[:alnum:]]` - Matches any digit or letter.
 *     - `[[:digit:]abc]` - Matches any digit, `a`, `b` or `c`.
 *     - See https://facelessuser.github.io/wcmatch/glob/#posix-character-classes
 *       for a complete list of supported character classes.
 * - `\` - Escapes the next character for an `os` other than `"windows"`.
 * - \` - Escapes the next character for `os` set to `"windows"`.
 * - `/` - Path separator.
 * - `\` - Additional path separator only for `os` set to `"windows"`.
 *
 * Extended syntax:
 * - Requires `{ extended: true }`.
 * - `?(foo|bar)` - Matches 0 or 1 instance of `{foo,bar}`.
 * - `@(foo|bar)` - Matches 1 instance of `{foo,bar}`. They behave the same.
 * - `*(foo|bar)` - Matches _n_ instances of `{foo,bar}`.
 * - `+(foo|bar)` - Matches _n > 0_ instances of `{foo,bar}`.
 * - `!(foo|bar)` - Matches anything other than `{foo,bar}`.
 * - See https://www.linuxjournal.com/content/bash-extended-globbing.
 *
 * Globstar syntax:
 * - Requires `{ globstar: true }`.
 * - `**` - Matches any number of any path segments.
 *     - Must comprise its entire path segment in the provided glob.
 * - See https://www.linuxjournal.com/content/globstar-new-bash-globbing-option.
 *
 * Note the following properties:
 * - The generated `RegExp` is anchored at both start and end.
 * - Repeating and trailing separators are tolerated. Trailing separators in the
 *   provided glob have no meaning and are discarded.
 * - Absolute globs will only match absolute paths, etc.
 * - Empty globs will match nothing.
 * - Any special glob syntax must be contained to one path segment. For example,
 *   `?(foo|bar/baz)` is invalid. The separator will take precedence and the
 *   first segment ends with an unclosed group.
 * - If a path segment ends with unclosed groups or a dangling escape prefix, a
 *   parse error has occurred. Every character for that segment is taken
 *   literally in this event.
 *
 * Limitations:
 * - A negative group like `!(foo|bar)` will wrongly be converted to a negative
 *   look-ahead followed by a wildcard. This means that `!(foo).js` will wrongly
 *   fail to match `foobar.js`, even though `foobar` is not `foo`. Effectively,
 *   `!(foo|bar)` is treated like `!(@(foo|bar)*)`. This will work correctly if
 *   the group occurs not nested at the end of the segment. */ export function globToRegExp(glob, { extended =true , globstar: globstarOption = true , os =osType , caseInsensitive =false  } = {}) {
    if (glob == "") {
        return /(?!)/;
    }
    const sep = os == "windows" ? "(?:\\\\|/)+" : "/+";
    const sepMaybe = os == "windows" ? "(?:\\\\|/)*" : "/*";
    const seps = os == "windows" ? [
        "\\",
        "/"
    ] : [
        "/"
    ];
    const globstar = os == "windows" ? "(?:[^\\\\/]*(?:\\\\|/|$)+)*" : "(?:[^/]*(?:/|$)+)*";
    const wildcard = os == "windows" ? "[^\\\\/]*" : "[^/]*";
    const escapePrefix = os == "windows" ? "`" : "\\";
    // Remove trailing separators.
    let newLength = glob.length;
    for(; newLength > 1 && seps.includes(glob[newLength - 1]); newLength--);
    glob = glob.slice(0, newLength);
    let regExpString = "";
    // Terminates correctly. Trust that `j` is incremented every iteration.
    for(let j = 0; j < glob.length;){
        let segment = "";
        const groupStack = [];
        let inRange = false;
        let inEscape = false;
        let endsWithSep = false;
        let i = j;
        // Terminates with `i` at the non-inclusive end of the current segment.
        for(; i < glob.length && !seps.includes(glob[i]); i++){
            if (inEscape) {
                inEscape = false;
                const escapeChars = inRange ? rangeEscapeChars : regExpEscapeChars;
                segment += escapeChars.includes(glob[i]) ? `\\${glob[i]}` : glob[i];
                continue;
            }
            if (glob[i] == escapePrefix) {
                inEscape = true;
                continue;
            }
            if (glob[i] == "[") {
                if (!inRange) {
                    inRange = true;
                    segment += "[";
                    if (glob[i + 1] == "!") {
                        i++;
                        segment += "^";
                    } else if (glob[i + 1] == "^") {
                        i++;
                        segment += "\\^";
                    }
                    continue;
                } else if (glob[i + 1] == ":") {
                    let k = i + 1;
                    let value = "";
                    while(glob[k + 1] != null && glob[k + 1] != ":"){
                        value += glob[k + 1];
                        k++;
                    }
                    if (glob[k + 1] == ":" && glob[k + 2] == "]") {
                        i = k + 2;
                        if (value == "alnum") segment += "\\dA-Za-z";
                        else if (value == "alpha") segment += "A-Za-z";
                        else if (value == "ascii") segment += "\x00-\x7F";
                        else if (value == "blank") segment += "\t ";
                        else if (value == "cntrl") segment += "\x00-\x1F\x7F";
                        else if (value == "digit") segment += "\\d";
                        else if (value == "graph") segment += "\x21-\x7E";
                        else if (value == "lower") segment += "a-z";
                        else if (value == "print") segment += "\x20-\x7E";
                        else if (value == "punct") {
                            segment += "!\"#$%&'()*+,\\-./:;<=>?@[\\\\\\]^_‘{|}~";
                        } else if (value == "space") segment += "\\s\v";
                        else if (value == "upper") segment += "A-Z";
                        else if (value == "word") segment += "\\w";
                        else if (value == "xdigit") segment += "\\dA-Fa-f";
                        continue;
                    }
                }
            }
            if (glob[i] == "]" && inRange) {
                inRange = false;
                segment += "]";
                continue;
            }
            if (inRange) {
                if (glob[i] == "\\") {
                    segment += `\\\\`;
                } else {
                    segment += glob[i];
                }
                continue;
            }
            if (glob[i] == ")" && groupStack.length > 0 && groupStack[groupStack.length - 1] != "BRACE") {
                segment += ")";
                const type = groupStack.pop();
                if (type == "!") {
                    segment += wildcard;
                } else if (type != "@") {
                    segment += type;
                }
                continue;
            }
            if (glob[i] == "|" && groupStack.length > 0 && groupStack[groupStack.length - 1] != "BRACE") {
                segment += "|";
                continue;
            }
            if (glob[i] == "+" && extended && glob[i + 1] == "(") {
                i++;
                groupStack.push("+");
                segment += "(?:";
                continue;
            }
            if (glob[i] == "@" && extended && glob[i + 1] == "(") {
                i++;
                groupStack.push("@");
                segment += "(?:";
                continue;
            }
            if (glob[i] == "?") {
                if (extended && glob[i + 1] == "(") {
                    i++;
                    groupStack.push("?");
                    segment += "(?:";
                } else {
                    segment += ".";
                }
                continue;
            }
            if (glob[i] == "!" && extended && glob[i + 1] == "(") {
                i++;
                groupStack.push("!");
                segment += "(?!";
                continue;
            }
            if (glob[i] == "{") {
                groupStack.push("BRACE");
                segment += "(?:";
                continue;
            }
            if (glob[i] == "}" && groupStack[groupStack.length - 1] == "BRACE") {
                groupStack.pop();
                segment += ")";
                continue;
            }
            if (glob[i] == "," && groupStack[groupStack.length - 1] == "BRACE") {
                segment += "|";
                continue;
            }
            if (glob[i] == "*") {
                if (extended && glob[i + 1] == "(") {
                    i++;
                    groupStack.push("*");
                    segment += "(?:";
                } else {
                    const prevChar = glob[i - 1];
                    let numStars = 1;
                    while(glob[i + 1] == "*"){
                        i++;
                        numStars++;
                    }
                    const nextChar = glob[i + 1];
                    if (globstarOption && numStars == 2 && [
                        ...seps,
                        undefined
                    ].includes(prevChar) && [
                        ...seps,
                        undefined
                    ].includes(nextChar)) {
                        segment += globstar;
                        endsWithSep = true;
                    } else {
                        segment += wildcard;
                    }
                }
                continue;
            }
            segment += regExpEscapeChars.includes(glob[i]) ? `\\${glob[i]}` : glob[i];
        }
        // Check for unclosed groups or a dangling backslash.
        if (groupStack.length > 0 || inRange || inEscape) {
            // Parse failure. Take all characters from this segment literally.
            segment = "";
            for (const c of glob.slice(j, i)){
                segment += regExpEscapeChars.includes(c) ? `\\${c}` : c;
                endsWithSep = false;
            }
        }
        regExpString += segment;
        if (!endsWithSep) {
            regExpString += i < glob.length ? sep : sepMaybe;
            endsWithSep = true;
        }
        // Terminates with `i` at the start of the next segment.
        while(seps.includes(glob[i]))i++;
        // Check that the next value of `j` is indeed higher than the current value.
        if (!(i > j)) {
            throw new Error("Assertion failure: i > j (potential infinite loop)");
        }
        j = i;
    }
    regExpString = `^${regExpString}$`;
    return new RegExp(regExpString, caseInsensitive ? "i" : "");
}
/** Test whether the given string is a glob */ export function isGlob(str) {
    const chars = {
        "{": "}",
        "(": ")",
        "[": "]"
    };
    const regex = /\\(.)|(^!|\*|\?|[\].+)]\?|\[[^\\\]]+\]|\{[^\\}]+\}|\(\?[:!=][^\\)]+\)|\([^|]+\|[^\\)]+\))/;
    if (str === "") {
        return false;
    }
    let match;
    while(match = regex.exec(str)){
        if (match[2]) return true;
        let idx = match.index + match[0].length;
        // if an open bracket/brace/paren is escaped,
        // set the index to the next closing character
        const open = match[1];
        const close = open ? chars[open] : null;
        if (open && close) {
            const n = str.indexOf(close, idx);
            if (n !== -1) {
                idx = n + 1;
            }
        }
        str = str.slice(idx);
    }
    return false;
}
/** Like normalize(), but doesn't collapse "**\/.." when `globstar` is true. */ export function normalizeGlob(glob, { globstar =false  } = {}) {
    if (glob.match(/\0/g)) {
        throw new Error(`Glob contains invalid characters: "${glob}"`);
    }
    if (!globstar) {
        return normalize(glob);
    }
    const s = SEP_PATTERN.source;
    const badParentPattern = new RegExp(`(?<=(${s}|^)\\*\\*${s})\\.\\.(?=${s}|$)`, "g");
    return normalize(glob.replace(badParentPattern, "\0")).replace(/\0/g, "..");
}
/** Like join(), but doesn't collapse "**\/.." when `globstar` is true. */ export function joinGlobs(globs, { extended =true , globstar =false  } = {}) {
    if (!globstar || globs.length == 0) {
        return join(...globs);
    }
    if (globs.length === 0) return ".";
    let joined;
    for (const glob of globs){
        const path = glob;
        if (path.length > 0) {
            if (!joined) joined = path;
            else joined += `${SEP}${path}`;
        }
    }
    if (!joined) return ".";
    return normalizeGlob(joined, {
        extended,
        globstar
    });
}
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