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Dir : ~/usr/share/nodejs/convert-source-map/

Edit File: index.js

'use strict';
var fs = require('fs');
var path = require('path');

Object.defineProperty(exports, 'commentRegex', {
  get: function getCommentRegex () {
    return /^\s*\/(?:\/|\*)[@#]\s+sourceMappingURL=data:(?:application|text)\/json;(?:charset[:=]\S+?;)?base64,(?:.*)$/mg;
  }
});

Object.defineProperty(exports, 'mapFileCommentRegex', {
  get: function getMapFileCommentRegex () {
    // Matches sourceMappingURL in either // or /* comment styles.
    return /(?:\/\/[@#][ \t]+sourceMappingURL=([^\s'"`]+?)[ \t]*$)|(?:\/\*[@#][ \t]+sourceMappingURL=([^\*]+?)[ \t]*(?:\*\/){1}[ \t]*$)/mg;
  }
});

var decodeBase64;
if (typeof Buffer !== 'undefined') {
  if (typeof Buffer.from === 'function') {
    decodeBase64 = decodeBase64WithBufferFrom;
  } else {
    decodeBase64 = decodeBase64WithNewBuffer;
  }
} else {
  decodeBase64 = decodeBase64WithAtob;
}

function decodeBase64WithBufferFrom(base64) {
  return Buffer.from(base64, 'base64').toString();
}

function decodeBase64WithNewBuffer(base64) {
  if (typeof value === 'number') {
    throw new TypeError('The value to decode must not be of type number.');
  }
  return new Buffer(base64, 'base64').toString();
}

function decodeBase64WithAtob(base64) {
  return decodeURIComponent(escape(atob(base64)));
}

function stripComment(sm) {
  return sm.split(',').pop();
}

function readFromFileMap(sm, dir) {
  // NOTE: this will only work on the server since it attempts to read the map file

var r = exports.mapFileCommentRegex.exec(sm);

// for some odd reason //# .. captures in 1 and /* .. */ in 2
  var filename = r[1] || r[2];
  var filepath = path.resolve(dir, filename);

try {
    return fs.readFileSync(filepath, 'utf8');
  } catch (e) {
    throw new Error('An error occurred while trying to read the map file at ' + filepath + '\n' + e);
  }
}

function Converter (sm, opts) {
  opts = opts || {};

if (opts.isFileComment) sm = readFromFileMap(sm, opts.commentFileDir);
  if (opts.hasComment) sm = stripComment(sm);
  if (opts.isEncoded) sm = decodeBase64(sm);
  if (opts.isJSON || opts.isEncoded) sm = JSON.parse(sm);

this.sourcemap = sm;
}

Converter.prototype.toJSON = function (space) {
  return JSON.stringify(this.sourcemap, null, space);
};

if (typeof Buffer !== 'undefined') {
  if (typeof Buffer.from === 'function') {
    Converter.prototype.toBase64 = encodeBase64WithBufferFrom;
  } else {
    Converter.prototype.toBase64 = encodeBase64WithNewBuffer;
  }
} else {
  Converter.prototype.toBase64 = encodeBase64WithBtoa;
}

function encodeBase64WithBufferFrom() {
  var json = this.toJSON();
  return Buffer.from(json, 'utf8').toString('base64');
}

function encodeBase64WithNewBuffer() {
  var json = this.toJSON();
  if (typeof json === 'number') {
    throw new TypeError('The json to encode must not be of type number.');
  }
  return new Buffer(json, 'utf8').toString('base64');
}

function encodeBase64WithBtoa() {
  var json = this.toJSON();
  return btoa(unescape(encodeURIComponent(json)));
}

Converter.prototype.toComment = function (options) {
  var base64 = this.toBase64();
  var data = 'sourceMappingURL=data:application/json;charset=utf-8;base64,' + base64;
  return options && options.multiline ? '/*# ' + data + ' */' : '//# ' + data;
};

// returns copy instead of original
Converter.prototype.toObject = function () {
  return JSON.parse(this.toJSON());
};

Converter.prototype.addProperty = function (key, value) {
  if (this.sourcemap.hasOwnProperty(key)) throw new Error('property "' + key + '" already exists on the sourcemap, use set property instead');
  return this.setProperty(key, value);
};

Converter.prototype.setProperty = function (key, value) {
  this.sourcemap[key] = value;
  return this;
};

Converter.prototype.getProperty = function (key) {
  return this.sourcemap[key];
};

exports.fromObject = function (obj) {
  return new Converter(obj);
};

exports.fromJSON = function (json) {
  return new Converter(json, { isJSON: true });
};

exports.fromBase64 = function (base64) {
  return new Converter(base64, { isEncoded: true });
};

exports.fromComment = function (comment) {
  comment = comment
    .replace(/^\/\*/g, '//')
    .replace(/\*\/$/g, '');

return new Converter(comment, { isEncoded: true, hasComment: true });
};

exports.fromMapFileComment = function (comment, dir) {
  return new Converter(comment, { commentFileDir: dir, isFileComment: true, isJSON: true });
};

// Finds last sourcemap comment in file or returns null if none was found
exports.fromSource = function (content) {
  var m = content.match(exports.commentRegex);
  return m ? exports.fromComment(m.pop()) : null;
};

// Finds last sourcemap comment in file or returns null if none was found
exports.fromMapFileSource = function (content, dir) {
  var m = content.match(exports.mapFileCommentRegex);
  return m ? exports.fromMapFileComment(m.pop(), dir) : null;
};

exports.removeComments = function (src) {
  return src.replace(exports.commentRegex, '');
};

exports.removeMapFileComments = function (src) {
  return src.replace(exports.mapFileCommentRegex, '');
};

exports.generateMapFileComment = function (file, options) {
  var data = 'sourceMappingURL=' + file;
  return options && options.multiline ? '/*# ' + data + ' */' : '//# ' + data;
};