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Editing File: /usr/share/nodejs/whatwg-mimetype/lib/parser.js

"use strict";
const {
  removeLeadingAndTrailingHTTPWhitespace,
  removeTrailingHTTPWhitespace,
  isHTTPWhitespaceChar,
  solelyContainsHTTPTokenCodePoints,
  soleyContainsHTTPQuotedStringTokenCodePoints,
  asciiLowercase,
  collectAnHTTPQuotedString
} = require("./utils.js");

module.exports = input => {
  input = removeLeadingAndTrailingHTTPWhitespace(input);

let position = 0;
  let type = "";
  while (position < input.length && input[position] !== "/") {
    type += input[position];
    ++position;
  }

if (type.length === 0 || !solelyContainsHTTPTokenCodePoints(type)) {
    return null;
  }

if (position >= input.length) {
    return null;
  }

// Skips past "/"
  ++position;

let subtype = "";
  while (position < input.length && input[position] !== ";") {
    subtype += input[position];
    ++position;
  }

subtype = removeTrailingHTTPWhitespace(subtype);

if (subtype.length === 0 || !solelyContainsHTTPTokenCodePoints(subtype)) {
    return null;
  }

const mimeType = {
    type: asciiLowercase(type),
    subtype: asciiLowercase(subtype),
    parameters: new Map()
  };

while (position < input.length) {
    // Skip past ";"
    ++position;

while (isHTTPWhitespaceChar(input[position])) {
      ++position;
    }

let parameterName = "";
    while (position < input.length && input[position] !== ";" && input[position] !== "=") {
      parameterName += input[position];
      ++position;
    }
    parameterName = asciiLowercase(parameterName);

if (position < input.length) {
      if (input[position] === ";") {
        continue;
      }

// Skip past "="
      ++position;
    }

let parameterValue = null;
    if (input[position] === "\"") {
      [parameterValue, position] = collectAnHTTPQuotedString(input, position);

while (position < input.length && input[position] !== ";") {
        ++position;
      }
    } else {
      parameterValue = "";
      while (position < input.length && input[position] !== ";") {
        parameterValue += input[position];
        ++position;
      }

parameterValue = removeTrailingHTTPWhitespace(parameterValue);

if (parameterValue === "") {
        continue;
      }
    }

if (parameterName.length > 0 &&
        solelyContainsHTTPTokenCodePoints(parameterName) &&
        soleyContainsHTTPQuotedStringTokenCodePoints(parameterValue) &&
        !mimeType.parameters.has(parameterName)) {
      mimeType.parameters.set(parameterName, parameterValue);
    }
  }

return mimeType;
};

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