'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var pluginutils = require('@rollup/pluginutils');
var MagicString = require('magic-string');

function _interopDefaultCompat (e) { return e && typeof e === 'object' && 'default' in e ? e : { default: e }; }

var MagicString__default = /*#__PURE__*/_interopDefaultCompat(MagicString);

function processCaptureOption(option) {
  // return null if option is null or undefined
  if (option == null) return null;
  // return option if it's a function
  if (typeof option === 'function') return option;
  // throw if option is not an object at this point
  if (typeof option !== 'object') throw new TypeError(`${option} is not a function nor an object`);
  // return capture function from object
  return captured => {
    option.shebang = captured;
  };
}

function stripShebang(options = {}) {
  const {
    include = /\.[jt]s$/,
    exclude,
    capture,
    sourcemap
  } = options;
  // create filter
  const filter = pluginutils.createFilter(include, exclude);
  // normalize capture option
  const captureShebang = processCaptureOption(capture);
  // normalize sourcemap option
  const generateMap = sourcemap !== false;
  return {
    name: 'strip-shebang',
    transform(sourceCode, id) {
      // exit if filter doesn't pass the test
      if (!filter(id)) return;
      // check if shebang is present in the file
      const match = /^#!.*/.exec(sourceCode);
      // exit if shebang not resent
      if (!match) return;
      // get shebang from match
      const [shebang] = match;
      // store shebang
      if (captureShebang) {
        captureShebang(shebang);
      }
      // get shebang length
      const {
        length
      } = shebang;
      // return transformed string only if no sourcemap needs to be generated
      if (!generateMap) return sourceCode.substring(length);
      // create sourcemap manager
      const ms = new MagicString__default.default(sourceCode).remove(0, length);
      // return transformed string with sourcemap
      const code = ms.toString();
      const map = ms.generateMap({
        hires: true
      });
      return {
        code,
        map
      };
    }
  };
}

exports.stripShebang = stripShebang;
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