stylus-native-loader/dist/evaluator.js

A super fast Stylus loader for Webpack that leverages the built-in power of Stylus

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = getAliasEvaluator;
var _path = _interopRequireDefault(require("path"));
var _evaluator = _interopRequireDefault(require("stylus/lib/visitor/evaluator"));
var _util = require("./util");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/**
 * @param {Object} context
 * @param {Object|false} aliases
 * @param {boolean} resolveTilde
 *
 * @returns {Function<AliasEvaluator>|boolean}
 */
function getAliasEvaluator(context, aliases, resolveTilde) {
  let aliasList = null;
  function resolveAlias(importPath) {
    const firstChar = importPath[0];
    if (aliases) {
      if (firstChar === '.' || firstChar === '/' || _path.default.isAbsolute(importPath)) {
        return importPath;
      }
      if (aliasList === null) {
        aliasList = (0, _util.getAliasList)(aliases);
      }
      for (const entry of aliasList) {
        if (entry.alias === importPath) {
          return entry.path;
        } else if (!entry.exact && importPath.indexOf(entry.aliasRoot) === 0) {
          return _path.default.resolve(entry.path, importPath.slice(entry.aliasRoot.length));
        }
      }
    }
    if (resolveTilde && firstChar === '~') {
      return (0, _util.resolveTildePath)(importPath);
    }
    return importPath;
  }
  return class AliasEvaluator extends _evaluator.default {
    visitImport(imported) {
      const node = this.visit(imported.path).first;
      if (typeof node.string === 'string' && node.string !== '') {
        node.string = resolveAlias(node.string);
      }

      // fix Stylus glob bug when resolveURL is true (see https://github.com/slightlyfaulty/stylus-native-loader/issues/2)
      if (this.resolveURL && !this.resolveURL.nocheck) {
        const resolveUrl = this.resolveURL;
        this.resolveURL = typeof resolveUrl === 'object' ? {
          ...resolveUrl,
          nocheck: true
        } : {
          nocheck: true
        };
        const block = super.visitImport(imported);
        this.resolveURL = resolveUrl;
        return block;
      } else {
        return super.visitImport(imported);
      }
    }
  };
}