utils.js

/*
  MIT License http://www.opensource.org/licenses/mit-license.php
  Author Tobias Koppers @sokra
*/
import { fileURLToPath } from "url";
import path from "path";

import modulesValues from "postcss-modules-values";
import localByDefault from "postcss-modules-local-by-default";
import extractImports from "postcss-modules-extract-imports";
import modulesScope from "postcss-modules-scope";

const WEBPACK_IGNORE_COMMENT_REGEXP = /webpackIgnore:(\s+)?(true|false)/;

const matchRelativePath = /^\.\.?[/\\]/;

function isAbsolutePath(str) {
  return path.posix.isAbsolute(str) || path.win32.isAbsolute(str);
}

function isRelativePath(str) {
  return matchRelativePath.test(str);
}

// TODO simplify for the next major release
function stringifyRequest(loaderContext, request) {
  if (
    typeof loaderContext.utils !== "undefined" &&
    typeof loaderContext.utils.contextify === "function"
  ) {
    return JSON.stringify(
      loaderContext.utils.contextify(
        loaderContext.context || loaderContext.rootContext,
        request
      )
    );
  }

  const splitted = request.split("!");
  const { context } = loaderContext;

  return JSON.stringify(
    splitted
      .map((part) => {
        // First, separate singlePath from query, because the query might contain paths again
        const splittedPart = part.match(/^(.*?)(\?.*)/);
        const query = splittedPart ? splittedPart[2] : "";
        let singlePath = splittedPart ? splittedPart[1] : part;

        if (isAbsolutePath(singlePath) && context) {
          singlePath = path.relative(context, singlePath);

          if (isAbsolutePath(singlePath)) {
            // If singlePath still matches an absolute path, singlePath was on a different drive than context.
            // In this case, we leave the path platform-specific without replacing any separators.
            // @see https://github.com/webpack/loader-utils/pull/14
            return singlePath + query;
          }

          if (isRelativePath(singlePath) === false) {
            // Ensure that the relative path starts at least with ./ otherwise it would be a request into the modules directory (like node_modules).
            singlePath = `./${singlePath}`;
          }
        }

        return singlePath.replace(/\\/g, "/") + query;
      })
      .join("!")
  );
}

// We can't use path.win32.isAbsolute because it also matches paths starting with a forward slash
const IS_NATIVE_WIN32_PATH = /^[a-z]:[/\\]|^\\\\/i;
const IS_MODULE_REQUEST = /^[^?]*~/;

function urlToRequest(url, root) {
  let request;

  if (IS_NATIVE_WIN32_PATH.test(url)) {
    // absolute windows path, keep it
    request = url;
  } else if (typeof root !== "undefined" && /^\//.test(url)) {
    request = root + url;
  } else if (/^\.\.?\//.test(url)) {
    // A relative url stays
    request = url;
  } else {
    // every other url is threaded like a relative url
    request = `./${url}`;
  }

  // A `~` makes the url an module
  if (IS_MODULE_REQUEST.test(request)) {
    request = request.replace(IS_MODULE_REQUEST, "");
  }

  return request;
}

// eslint-disable-next-line no-useless-escape
const regexSingleEscape = /[ -,.\/:-@[\]\^`{-~]/;
const regexExcessiveSpaces =
  /(^|\\+)?(\\[A-F0-9]{1,6})\x20(?![a-fA-F0-9\x20])/g;

const preserveCamelCase = (string) => {
  let result = string;
  let isLastCharLower = false;
  let isLastCharUpper = false;
  let isLastLastCharUpper = false;

  for (let i = 0; i < result.length; i++) {
    const character = result[i];

    if (isLastCharLower && /[\p{Lu}]/u.test(character)) {
      result = `${result.slice(0, i)}-${result.slice(i)}`;
      isLastCharLower = false;
      isLastLastCharUpper = isLastCharUpper;
      isLastCharUpper = true;
      i += 1;
    } else if (
      isLastCharUpper &&
      isLastLastCharUpper &&
      /[\p{Ll}]/u.test(character)
    ) {
      result = `${result.slice(0, i - 1)}-${result.slice(i - 1)}`;
      isLastLastCharUpper = isLastCharUpper;
      isLastCharUpper = false;
      isLastCharLower = true;
    } else {
      isLastCharLower =
        character.toLowerCase() === character &&
        character.toUpperCase() !== character;
      isLastLastCharUpper = isLastCharUpper;
      isLastCharUpper =
        character.toUpperCase() === character &&
        character.toLowerCase() !== character;
    }
  }

  return result;
};

function camelCase(input) {
  let result = input.trim();

  if (result.length === 0) {
    return "";
  }

  if (result.length === 1) {
    return result.toLowerCase();
  }

  const hasUpperCase = result !== result.toLowerCase();

  if (hasUpperCase) {
    result = preserveCamelCase(result);
  }

  return result
    .replace(/^[_.\- ]+/, "")
    .toLowerCase()
    .replace(/[_.\- ]+([\p{Alpha}\p{N}_]|$)/gu, (_, p1) => p1.toUpperCase())
    .replace(/\d+([\p{Alpha}\p{N}_]|$)/gu, (m) => m.toUpperCase());
}

function escape(string) {
  let output = "";
  let counter = 0;

  while (counter < string.length) {
    // eslint-disable-next-line no-plusplus
    const character = string.charAt(counter++);

    let value;

    // eslint-disable-next-line no-control-regex
    if (/[\t\n\f\r\x0B]/.test(character)) {
      const codePoint = character.charCodeAt();

      value = `\\${codePoint.toString(16).toUpperCase()} `;
    } else if (character === "\\" || regexSingleEscape.test(character)) {
      value = `\\${character}`;
    } else {
      value = character;
    }

    output += value;
  }

  const firstChar = string.charAt(0);

  if (/^-[-\d]/.test(output)) {
    output = `\\-${output.slice(1)}`;
  } else if (/\d/.test(firstChar)) {
    output = `\\3${firstChar} ${output.slice(1)}`;
  }

  // Remove spaces after `\HEX` escapes that are not followed by a hex digit,
  // since they’re redundant. Note that this is only possible if the escape
  // sequence isn’t preceded by an odd number of backslashes.
  output = output.replace(regexExcessiveSpaces, ($0, $1, $2) => {
    if ($1 && $1.length % 2) {
      // It’s not safe to remove the space, so don’t.
      return $0;
    }

    // Strip the space.
    return ($1 || "") + $2;
  });

  return output;
}

function gobbleHex(str) {
  const lower = str.toLowerCase();
  let hex = "";
  let spaceTerminated = false;

  // eslint-disable-next-line no-undefined
  for (let i = 0; i < 6 && lower[i] !== undefined; i++) {
    const code = lower.charCodeAt(i);
    // check to see if we are dealing with a valid hex char [a-f|0-9]
    const valid = (code >= 97 && code <= 102) || (code >= 48 && code <= 57);
    // https://drafts.csswg.org/css-syntax/#consume-escaped-code-point
    spaceTerminated = code === 32;

    if (!valid) {
      break;
    }

    hex += lower[i];
  }

  if (hex.length === 0) {
    // eslint-disable-next-line no-undefined
    return undefined;
  }

  const codePoint = parseInt(hex, 16);

  const isSurrogate = codePoint >= 0xd800 && codePoint <= 0xdfff;
  // Add special case for
  // "If this number is zero, or is for a surrogate, or is greater than the maximum allowed code point"
  // https://drafts.csswg.org/css-syntax/#maximum-allowed-code-point
  if (isSurrogate || codePoint === 0x0000 || codePoint > 0x10ffff) {
    return ["\uFFFD", hex.length + (spaceTerminated ? 1 : 0)];
  }

  return [
    String.fromCodePoint(codePoint),
    hex.length + (spaceTerminated ? 1 : 0),
  ];
}

const CONTAINS_ESCAPE = /\\/;

function unescape(str) {
  const needToProcess = CONTAINS_ESCAPE.test(str);

  if (!needToProcess) {
    return str;
  }

  let ret = "";

  for (let i = 0; i < str.length; i++) {
    if (str[i] === "\\") {
      const gobbled = gobbleHex(str.slice(i + 1, i + 7));

      // eslint-disable-next-line no-undefined
      if (gobbled !== undefined) {
        ret += gobbled[0];
        i += gobbled[1];

        // eslint-disable-next-line no-continue
        continue;
      }

      // Retain a pair of \\ if double escaped `\\\\`
      // https://github.com/postcss/postcss-selector-parser/commit/268c9a7656fb53f543dc620aa5b73a30ec3ff20e
      if (str[i + 1] === "\\") {
        ret += "\\";
        i += 1;

        // eslint-disable-next-line no-continue
        continue;
      }

      // if \\ is at the end of the string retain it
      // https://github.com/postcss/postcss-selector-parser/commit/01a6b346e3612ce1ab20219acc26abdc259ccefb
      if (str.length === i + 1) {
        ret += str[i];
      }

      // eslint-disable-next-line no-continue
      continue;
    }

    ret += str[i];
  }

  return ret;
}

function normalizePath(file) {
  return path.sep === "\\" ? file.replace(/\\/g, "/") : file;
}

// eslint-disable-next-line no-control-regex
const filenameReservedRegex = /[<>:"/\\|?*]/g;
// eslint-disable-next-line no-control-regex
const reControlChars = /[\u0000-\u001f\u0080-\u009f]/g;

function escapeLocalIdent(localident) {
  // TODO simplify in the next major release
  return escape(
    localident
      // For `[hash]` placeholder
      .replace(/^((-?[0-9])|--)/, "_$1")
      .replace(filenameReservedRegex, "-")
      .replace(reControlChars, "-")
      .replace(/\./g, "-")
  );
}

function defaultGetLocalIdent(
  loaderContext,
  localIdentName,
  localName,
  options
) {
  const { context, hashSalt } = options;
  const { resourcePath } = loaderContext;
  const relativeResourcePath = normalizePath(
    path.relative(context, resourcePath)
  );

  // eslint-disable-next-line no-param-reassign
  options.content = `${relativeResourcePath}\x00${localName}`;

  let { hashFunction, hashDigest, hashDigestLength } = options;
  const matches = localIdentName.match(
    /\[(?:([^:\]]+):)?(?:(hash|contenthash|fullhash))(?::([a-z]+\d*))?(?::(\d+))?\]/i
  );

  if (matches) {
    const hashName = matches[2] || hashFunction;

    hashFunction = matches[1] || hashFunction;
    hashDigest = matches[3] || hashDigest;
    hashDigestLength = matches[4] || hashDigestLength;

    // `hash` and `contenthash` are same in `loader-utils` context
    // let's keep `hash` for backward compatibility

    // eslint-disable-next-line no-param-reassign
    localIdentName = localIdentName.replace(
      /\[(?:([^:\]]+):)?(?:hash|contenthash|fullhash)(?::([a-z]+\d*))?(?::(\d+))?\]/gi,
      () => (hashName === "fullhash" ? "[fullhash]" : "[contenthash]")
    );
  }

  let localIdentHash = "";

  for (let tier = 0; localIdentHash.length < hashDigestLength; tier++) {
    // TODO remove this in the next major release
    const hash =
      loaderContext.utils &&
      typeof loaderContext.utils.createHash === "function"
        ? loaderContext.utils.createHash(hashFunction)
        : // eslint-disable-next-line no-underscore-dangle
          loaderContext._compiler.webpack.util.createHash(hashFunction);

    if (hashSalt) {
      hash.update(hashSalt);
    }

    const tierSalt = Buffer.allocUnsafe(4);

    tierSalt.writeUInt32LE(tier);

    hash.update(tierSalt);
    // TODO: bug in webpack with unicode characters with strings
    hash.update(Buffer.from(options.content, "utf8"));

    localIdentHash = (localIdentHash + hash.digest(hashDigest))
      // Remove all leading digits
      .replace(/^\d+/, "")
      // Replace all slashes with underscores (same as in base64url)
      .replace(/\//g, "_")
      // Remove everything that is not an alphanumeric or underscore
      .replace(/[^A-Za-z0-9_]+/g, "")
      .slice(0, hashDigestLength);
  }

  // TODO need improve on webpack side, we should allow to pass hash/contentHash without chunk property, also `data` for `getPath` should be looks good without chunk property
  const ext = path.extname(resourcePath);
  const base = path.basename(resourcePath);
  const name = base.slice(0, base.length - ext.length);
  const data = {
    filename: path.relative(context, resourcePath),
    contentHash: localIdentHash,
    chunk: {
      name,
      hash: localIdentHash,
      contentHash: localIdentHash,
    },
  };

  // eslint-disable-next-line no-underscore-dangle
  let result = loaderContext._compilation.getPath(localIdentName, data);

  if (/\[folder\]/gi.test(result)) {
    const dirname = path.dirname(resourcePath);
    let directory = normalizePath(
      path.relative(context, `${dirname + path.sep}_`)
    );

    directory = directory.substr(0, directory.length - 1);

    let folder = "";

    if (directory.length > 1) {
      folder = path.basename(directory);
    }

    result = result.replace(/\[folder\]/gi, () => folder);
  }

  if (options.regExp) {
    const match = resourcePath.match(options.regExp);

    if (match) {
      match.forEach((matched, i) => {
        result = result.replace(new RegExp(`\\[${i}\\]`, "ig"), matched);
      });
    }
  }

  return result;
}

function fixedEncodeURIComponent(str) {
  return str.replace(/[!'()*]/g, (c) => `%${c.charCodeAt(0).toString(16)}`);
}

function isDataUrl(url) {
  if (/^data:/i.test(url)) {
    return true;
  }

  return false;
}

const NATIVE_WIN32_PATH = /^[A-Z]:[/\\]|^\\\\/i;

function normalizeUrl(url, isStringValue) {
  let normalizedUrl = url
    .replace(/^( |\t\n|\r\n|\r|\f)*/g, "")
    .replace(/( |\t\n|\r\n|\r|\f)*$/g, "");

  if (isStringValue && /\\(\n|\r\n|\r|\f)/.test(normalizedUrl)) {
    normalizedUrl = normalizedUrl.replace(/\\(\n|\r\n|\r|\f)/g, "");
  }

  if (NATIVE_WIN32_PATH.test(url)) {
    try {
      normalizedUrl = decodeURI(normalizedUrl);
    } catch (error) {
      // Ignore
    }

    return normalizedUrl;
  }

  normalizedUrl = unescape(normalizedUrl);

  if (isDataUrl(url)) {
    // Todo fixedEncodeURIComponent is workaround. Webpack resolver shouldn't handle "!" in dataURL
    return fixedEncodeURIComponent(normalizedUrl);
  }

  try {
    normalizedUrl = decodeURI(normalizedUrl);
  } catch (error) {
    // Ignore
  }

  return normalizedUrl;
}

function requestify(url, rootContext, needToResolveURL = true) {
  if (needToResolveURL) {
    if (/^file:/i.test(url)) {
      return fileURLToPath(url);
    }

    return url.charAt(0) === "/"
      ? urlToRequest(url, rootContext)
      : urlToRequest(url);
  }

  if (url.charAt(0) === "/" || /^file:/i.test(url)) {
    return url;
  }

  // A `~` makes the url an module
  if (IS_MODULE_REQUEST.test(url)) {
    return url.replace(IS_MODULE_REQUEST, "");
  }

  return url;
}

function getFilter(filter, resourcePath) {
  return (...args) => {
    if (typeof filter === "function") {
      return filter(...args, resourcePath);
    }

    return true;
  };
}

function getValidLocalName(localName, exportLocalsConvention) {
  const result = exportLocalsConvention(localName);

  return Array.isArray(result) ? result[0] : result;
}

const IS_MODULES = /\.module(s)?\.\w+$/i;
const IS_ICSS = /\.icss\.\w+$/i;

function getModulesOptions(rawOptions, exportType, loaderContext) {
  if (typeof rawOptions.modules === "boolean" && rawOptions.modules === false) {
    return false;
  }

  const resourcePath =
    // eslint-disable-next-line no-underscore-dangle
    (loaderContext._module && loaderContext._module.matchResource) ||
    loaderContext.resourcePath;

  let auto;
  let rawModulesOptions;

  if (typeof rawOptions.modules === "undefined") {
    rawModulesOptions = {};
    auto = true;
  } else if (typeof rawOptions.modules === "boolean") {
    rawModulesOptions = {};
  } else if (typeof rawOptions.modules === "string") {
    rawModulesOptions = { mode: rawOptions.modules };
  } else {
    rawModulesOptions = rawOptions.modules;
    ({ auto } = rawModulesOptions);
  }

  // eslint-disable-next-line no-underscore-dangle
  const { outputOptions } = loaderContext._compilation;
  const needNamedExport =
    exportType === "css-style-sheet" || exportType === "string";
  const modulesOptions = {
    auto,
    mode: "local",
    exportGlobals: false,
    localIdentName: "[hash:base64]",
    localIdentContext: loaderContext.rootContext,
    localIdentHashSalt: outputOptions.hashSalt,
    localIdentHashFunction: outputOptions.hashFunction,
    localIdentHashDigest: outputOptions.hashDigest,
    localIdentHashDigestLength: outputOptions.hashDigestLength,
    // eslint-disable-next-line no-undefined
    localIdentRegExp: undefined,
    // eslint-disable-next-line no-undefined
    getLocalIdent: undefined,
    namedExport: needNamedExport || false,
    exportLocalsConvention:
      (rawModulesOptions.namedExport === true || needNamedExport) &&
      typeof rawModulesOptions.exportLocalsConvention === "undefined"
        ? "camelCaseOnly"
        : "asIs",
    exportOnlyLocals: false,
    ...rawModulesOptions,
  };

  let exportLocalsConventionType;

  if (typeof modulesOptions.exportLocalsConvention === "string") {
    exportLocalsConventionType = modulesOptions.exportLocalsConvention;

    modulesOptions.exportLocalsConvention = (name) => {
      switch (exportLocalsConventionType) {
        case "camelCase": {
          return [name, camelCase(name)];
        }
        case "camelCaseOnly": {
          return camelCase(name);
        }
        case "dashes": {
          return [name, dashesCamelCase(name)];
        }
        case "dashesOnly": {
          return dashesCamelCase(name);
        }
        case "asIs":
        default:
          return name;
      }
    };
  }

  if (typeof modulesOptions.auto === "boolean") {
    const isModules = modulesOptions.auto && IS_MODULES.test(resourcePath);

    let isIcss;

    if (!isModules) {
      isIcss = IS_ICSS.test(resourcePath);

      if (isIcss) {
        modulesOptions.mode = "icss";
      }
    }

    if (!isModules && !isIcss) {
      return false;
    }
  } else if (modulesOptions.auto instanceof RegExp) {
    const isModules = modulesOptions.auto.test(resourcePath);

    if (!isModules) {
      return false;
    }
  } else if (typeof modulesOptions.auto === "function") {
    const isModule = modulesOptions.auto(resourcePath);

    if (!isModule) {
      return false;
    }
  }

  if (typeof modulesOptions.mode === "function") {
    modulesOptions.mode = modulesOptions.mode(loaderContext.resourcePath);
  }

  if (needNamedExport) {
    if (rawOptions.esModule === false) {
      throw new Error(
        "The 'exportType' option with the 'css-style-sheet' or 'string' value requires the 'esModules' option to be enabled"
      );
    }

    if (modulesOptions.namedExport === false) {
      throw new Error(
        "The 'exportType' option with the 'css-style-sheet' or 'string' value requires the 'modules.namedExport' option to be enabled"
      );
    }
  }

  if (modulesOptions.namedExport === true) {
    if (rawOptions.esModule === false) {
      throw new Error(
        "The 'modules.namedExport' option requires the 'esModules' option to be enabled"
      );
    }

    if (
      typeof exportLocalsConventionType === "string" &&
      exportLocalsConventionType !== "camelCaseOnly" &&
      exportLocalsConventionType !== "dashesOnly"
    ) {
      throw new Error(
        'The "modules.namedExport" option requires the "modules.exportLocalsConvention" option to be "camelCaseOnly" or "dashesOnly"'
      );
    }
  }

  return modulesOptions;
}

function normalizeOptions(rawOptions, loaderContext) {
  const exportType =
    typeof rawOptions.exportType === "undefined"
      ? "array"
      : rawOptions.exportType;
  const modulesOptions = getModulesOptions(
    rawOptions,
    exportType,
    loaderContext
  );

  return {
    url: typeof rawOptions.url === "undefined" ? true : rawOptions.url,
    import: typeof rawOptions.import === "undefined" ? true : rawOptions.import,
    modules: modulesOptions,
    sourceMap:
      typeof rawOptions.sourceMap === "boolean"
        ? rawOptions.sourceMap
        : loaderContext.sourceMap,
    importLoaders:
      typeof rawOptions.importLoaders === "string"
        ? parseInt(rawOptions.importLoaders, 10)
        : rawOptions.importLoaders,
    esModule:
      typeof rawOptions.esModule === "undefined" ? true : rawOptions.esModule,
    exportType,
  };
}

function shouldUseImportPlugin(options) {
  if (options.modules.exportOnlyLocals) {
    return false;
  }

  if (typeof options.import === "boolean") {
    return options.import;
  }

  return true;
}

function shouldUseURLPlugin(options) {
  if (options.modules.exportOnlyLocals) {
    return false;
  }

  if (typeof options.url === "boolean") {
    return options.url;
  }

  return true;
}

function shouldUseModulesPlugins(options) {
  if (typeof options.modules === "boolean" && options.modules === false) {
    return false;
  }

  return options.modules.mode !== "icss";
}

function shouldUseIcssPlugin(options) {
  return Boolean(options.modules);
}

function getModulesPlugins(options, loaderContext) {
  const {
    mode,
    getLocalIdent,
    localIdentName,
    localIdentContext,
    localIdentHashSalt,
    localIdentHashFunction,
    localIdentHashDigest,
    localIdentHashDigestLength,
    localIdentRegExp,
  } = options.modules;

  let plugins = [];

  try {
    plugins = [
      modulesValues,
      localByDefault({ mode }),
      extractImports(),
      modulesScope({
        generateScopedName(exportName) {
          let localIdent;

          if (typeof getLocalIdent !== "undefined") {
            localIdent = getLocalIdent(
              loaderContext,
              localIdentName,
              unescape(exportName),
              {
                context: localIdentContext,
                hashSalt: localIdentHashSalt,
                hashFunction: localIdentHashFunction,
                hashDigest: localIdentHashDigest,
                hashDigestLength: localIdentHashDigestLength,
                regExp: localIdentRegExp,
              }
            );
          }

          // A null/undefined value signals that we should invoke the default
          // getLocalIdent method.
          if (typeof localIdent === "undefined" || localIdent === null) {
            localIdent = defaultGetLocalIdent(
              loaderContext,
              localIdentName,
              unescape(exportName),
              {
                context: localIdentContext,
                hashSalt: localIdentHashSalt,
                hashFunction: localIdentHashFunction,
                hashDigest: localIdentHashDigest,
                hashDigestLength: localIdentHashDigestLength,
                regExp: localIdentRegExp,
              }
            );

            return escapeLocalIdent(localIdent).replace(
              /\\\[local\\]/gi,
              exportName
            );
          }

          return escapeLocalIdent(localIdent);
        },
        exportGlobals: options.modules.exportGlobals,
      }),
    ];
  } catch (error) {
    loaderContext.emitError(error);
  }

  return plugins;
}

const ABSOLUTE_SCHEME = /^[a-z0-9+\-.]+:/i;

function getURLType(source) {
  if (source[0] === "/") {
    if (source[1] === "/") {
      return "scheme-relative";
    }

    return "path-absolute";
  }

  if (IS_NATIVE_WIN32_PATH.test(source)) {
    return "path-absolute";
  }

  return ABSOLUTE_SCHEME.test(source) ? "absolute" : "path-relative";
}

function normalizeSourceMap(map, resourcePath) {
  let newMap = map;

  // Some loader emit source map as string
  // Strip any JSON XSSI avoidance prefix from the string (as documented in the source maps specification), and then parse the string as JSON.
  if (typeof newMap === "string") {
    newMap = JSON.parse(newMap);
  }

  delete newMap.file;

  const { sourceRoot } = newMap;

  delete newMap.sourceRoot;

  if (newMap.sources) {
    // Source maps should use forward slash because it is URLs (https://github.com/mozilla/source-map/issues/91)
    // We should normalize path because previous loaders like `sass-loader` using backslash when generate source map
    newMap.sources = newMap.sources.map((source) => {
      // Non-standard syntax from `postcss`
      if (source.indexOf("<") === 0) {
        return source;
      }

      const sourceType = getURLType(source);

      // Do no touch `scheme-relative` and `absolute` URLs
      if (sourceType === "path-relative" || sourceType === "path-absolute") {
        const absoluteSource =
          sourceType === "path-relative" && sourceRoot
            ? path.resolve(sourceRoot, normalizePath(source))
            : normalizePath(source);

        return path.relative(path.dirname(resourcePath), absoluteSource);
      }

      return source;
    });
  }

  return newMap;
}

function getPreRequester({ loaders, loaderIndex }) {
  const cache = Object.create(null);

  return (number) => {
    if (cache[number]) {
      return cache[number];
    }

    if (number === false) {
      cache[number] = "";
    } else {
      const loadersRequest = loaders
        .slice(
          loaderIndex,
          loaderIndex + 1 + (typeof number !== "number" ? 0 : number)
        )
        .map((x) => x.request)
        .join("!");

      cache[number] = `-!${loadersRequest}!`;
    }

    return cache[number];
  };
}

function getImportCode(imports, options) {
  let code = "";

  for (const item of imports) {
    const { importName, url, icss, type } = item;

    if (options.esModule) {
      if (icss && options.modules.namedExport) {
        code += `import ${
          options.modules.exportOnlyLocals ? "" : `${importName}, `
        }* as ${importName}_NAMED___ from ${url};\n`;
      } else {
        code +=
          type === "url"
            ? `var ${importName} = new URL(${url}, import.meta.url);\n`
            : `import ${importName} from ${url};\n`;
      }
    } else {
      code += `var ${importName} = require(${url});\n`;
    }
  }

  return code ? `// Imports\n${code}` : "";
}

function normalizeSourceMapForRuntime(map, loaderContext) {
  const resultMap = map ? map.toJSON() : null;

  if (resultMap) {
    delete resultMap.file;

    /* eslint-disable no-underscore-dangle */
    if (
      loaderContext._compilation &&
      loaderContext._compilation.options &&
      loaderContext._compilation.options.devtool &&
      loaderContext._compilation.options.devtool.includes("nosources")
    ) {
      /* eslint-enable no-underscore-dangle */

      delete resultMap.sourcesContent;
    }

    resultMap.sourceRoot = "";
    resultMap.sources = resultMap.sources.map((source) => {
      // Non-standard syntax from `postcss`
      if (source.indexOf("<") === 0) {
        return source;
      }

      const sourceType = getURLType(source);

      if (sourceType !== "path-relative") {
        return source;
      }

      const resourceDirname = path.dirname(loaderContext.resourcePath);
      const absoluteSource = path.resolve(resourceDirname, source);
      const contextifyPath = normalizePath(
        path.relative(loaderContext.rootContext, absoluteSource)
      );

      return `webpack://./${contextifyPath}`;
    });
  }

  return JSON.stringify(resultMap);
}

function printParams(media, dedupe, supports, layer) {
  let result = "";

  if (typeof layer !== "undefined") {
    result = `, ${JSON.stringify(layer)}`;
  }

  if (typeof supports !== "undefined") {
    result = `, ${JSON.stringify(supports)}${result}`;
  } else if (result.length > 0) {
    result = `, undefined${result}`;
  }

  if (dedupe) {
    result = `, true${result}`;
  } else if (result.length > 0) {
    result = `, false${result}`;
  }

  if (media) {
    result = `${JSON.stringify(media)}${result}`;
  } else if (result.length > 0) {
    result = `""${result}`;
  }

  return result;
}

function getModuleCode(result, api, replacements, options, loaderContext) {
  if (options.modules.exportOnlyLocals === true) {
    return "";
  }

  let sourceMapValue = "";

  if (options.sourceMap) {
    const sourceMap = result.map;

    sourceMapValue = `,${normalizeSourceMapForRuntime(
      sourceMap,
      loaderContext
    )}`;
  }

  let code = JSON.stringify(result.css);

  let beforeCode = `var ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(${
    options.sourceMap
      ? "___CSS_LOADER_API_SOURCEMAP_IMPORT___"
      : "___CSS_LOADER_API_NO_SOURCEMAP_IMPORT___"
  });\n`;

  for (const item of api) {
    const { url, layer, supports, media, dedupe } = item;

    if (url) {
      // eslint-disable-next-line no-undefined
      const printedParam = printParams(media, undefined, supports, layer);

      beforeCode += `___CSS_LOADER_EXPORT___.push([module.id, ${JSON.stringify(
        `@import url(${url});`
      )}${printedParam.length > 0 ? `, ${printedParam}` : ""}]);\n`;
    } else {
      const printedParam = printParams(media, dedupe, supports, layer);

      beforeCode += `___CSS_LOADER_EXPORT___.i(${item.importName}${
        printedParam.length > 0 ? `, ${printedParam}` : ""
      });\n`;
    }
  }

  for (const item of replacements) {
    const { replacementName, importName, localName } = item;

    if (localName) {
      code = code.replace(new RegExp(replacementName, "g"), () =>
        options.modules.namedExport
          ? `" + ${importName}_NAMED___[${JSON.stringify(
              getValidLocalName(
                localName,
                options.modules.exportLocalsConvention
              )
            )}] + "`
          : `" + ${importName}.locals[${JSON.stringify(localName)}] + "`
      );
    } else {
      const { hash, needQuotes } = item;
      const getUrlOptions = []
        .concat(hash ? [`hash: ${JSON.stringify(hash)}`] : [])
        .concat(needQuotes ? "needQuotes: true" : []);
      const preparedOptions =
        getUrlOptions.length > 0 ? `, { ${getUrlOptions.join(", ")} }` : "";

      beforeCode += `var ${replacementName} = ___CSS_LOADER_GET_URL_IMPORT___(${importName}${preparedOptions});\n`;
      code = code.replace(
        new RegExp(replacementName, "g"),
        () => `" + ${replacementName} + "`
      );
    }
  }

  // Indexes description:
  // 0 - module id
  // 1 - CSS code
  // 2 - media
  // 3 - source map
  // 4 - supports
  // 5 - layer
  return `${beforeCode}// Module\n___CSS_LOADER_EXPORT___.push([module.id, ${code}, ""${sourceMapValue}]);\n`;
}

function dashesCamelCase(str) {
  return str.replace(/-+(\w)/g, (match, firstLetter) =>
    firstLetter.toUpperCase()
  );
}

function getExportCode(exports, replacements, icssPluginUsed, options) {
  let code = "// Exports\n";

  if (icssPluginUsed) {
    let localsCode = "";

    const addExportToLocalsCode = (names, value) => {
      const normalizedNames = Array.isArray(names)
        ? new Set(names)
        : new Set([names]);

      for (const name of normalizedNames) {
        if (options.modules.namedExport) {
          localsCode += `export var ${name} = ${JSON.stringify(value)};\n`;
        } else {
          if (localsCode) {
            localsCode += `,\n`;
          }

          localsCode += `\t${JSON.stringify(name)}: ${JSON.stringify(value)}`;
        }
      }
    };

    for (const { name, value } of exports) {
      addExportToLocalsCode(
        options.modules.exportLocalsConvention(name),
        value
      );
    }

    for (const item of replacements) {
      const { replacementName, localName } = item;

      if (localName) {
        const { importName } = item;

        localsCode = localsCode.replace(
          new RegExp(replacementName, "g"),
          () => {
            if (options.modules.namedExport) {
              return `" + ${importName}_NAMED___[${JSON.stringify(
                getValidLocalName(
                  localName,
                  options.modules.exportLocalsConvention
                )
              )}] + "`;
            } else if (options.modules.exportOnlyLocals) {
              return `" + ${importName}[${JSON.stringify(localName)}] + "`;
            }

            return `" + ${importName}.locals[${JSON.stringify(localName)}] + "`;
          }
        );
      } else {
        localsCode = localsCode.replace(
          new RegExp(replacementName, "g"),
          () => `" + ${replacementName} + "`
        );
      }
    }

    if (options.modules.exportOnlyLocals) {
      code += options.modules.namedExport
        ? localsCode
        : `${
            options.esModule ? "export default" : "module.exports ="
          } {\n${localsCode}\n};\n`;

      return code;
    }

    code += options.modules.namedExport
      ? localsCode
      : `___CSS_LOADER_EXPORT___.locals = {${
          localsCode ? `\n${localsCode}\n` : ""
        }};\n`;
  }

  const isCSSStyleSheetExport = options.exportType === "css-style-sheet";

  if (isCSSStyleSheetExport) {
    code += "var ___CSS_LOADER_STYLE_SHEET___ = new CSSStyleSheet();\n";
    code +=
      "___CSS_LOADER_STYLE_SHEET___.replaceSync(___CSS_LOADER_EXPORT___.toString());\n";
  }

  let finalExport;

  switch (options.exportType) {
    case "string":
      finalExport = "___CSS_LOADER_EXPORT___.toString()";
      break;
    case "css-style-sheet":
      finalExport = "___CSS_LOADER_STYLE_SHEET___";
      break;
    default:
    case "array":
      finalExport = "___CSS_LOADER_EXPORT___";
      break;
  }

  code += `${
    options.esModule ? "export default" : "module.exports ="
  } ${finalExport};\n`;

  return code;
}

async function resolveRequests(resolve, context, possibleRequests) {
  return resolve(context, possibleRequests[0])
    .then((result) => result)
    .catch((error) => {
      const [, ...tailPossibleRequests] = possibleRequests;

      if (tailPossibleRequests.length === 0) {
        throw error;
      }

      return resolveRequests(resolve, context, tailPossibleRequests);
    });
}

function isURLRequestable(url, options = {}) {
  // Protocol-relative URLs
  if (/^\/\//.test(url)) {
    return { requestable: false, needResolve: false };
  }

  // `#` URLs
  if (/^#/.test(url)) {
    return { requestable: false, needResolve: false };
  }

  // Data URI
  if (isDataUrl(url) && options.isSupportDataURL) {
    try {
      decodeURIComponent(url);
    } catch (ignoreError) {
      return { requestable: false, needResolve: false };
    }

    return { requestable: true, needResolve: false };
  }

  // `file:` protocol
  if (/^file:/i.test(url)) {
    return { requestable: true, needResolve: true };
  }

  // Absolute URLs
  if (/^[a-z][a-z0-9+.-]*:/i.test(url) && !NATIVE_WIN32_PATH.test(url)) {
    if (options.isSupportAbsoluteURL && /^https?:/i.test(url)) {
      return { requestable: true, needResolve: false };
    }

    return { requestable: false, needResolve: false };
  }

  return { requestable: true, needResolve: true };
}

function sort(a, b) {
  return a.index - b.index;
}

function combineRequests(preRequest, url) {
  const idx = url.indexOf("!=!");

  return idx !== -1
    ? url.slice(0, idx + 3) + preRequest + url.slice(idx + 3)
    : preRequest + url;
}

export {
  normalizeOptions,
  shouldUseModulesPlugins,
  shouldUseImportPlugin,
  shouldUseURLPlugin,
  shouldUseIcssPlugin,
  normalizeUrl,
  requestify,
  getFilter,
  getModulesOptions,
  getModulesPlugins,
  normalizeSourceMap,
  getPreRequester,
  getImportCode,
  getModuleCode,
  getExportCode,
  resolveRequests,
  isURLRequestable,
  sort,
  WEBPACK_IGNORE_COMMENT_REGEXP,
  combineRequests,
  camelCase,
  stringifyRequest,
  isDataUrl,
};