string.js

/**
 * @license
 * Copyright The Closure Library Authors.
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @fileoverview Utilities for string manipulation.
 */


/**
 * Namespace for string utilities
 */
goog.provide('goog.string');
goog.provide('goog.string.Unicode');

goog.require('goog.dom.safe');
goog.require('goog.html.uncheckedconversions');
goog.require('goog.string.Const');
goog.require('goog.string.internal');

goog.require('goog.utils');


/**
 * @define {boolean} Enables HTML escaping of lowercase letter "e" which helps
 * with detection of double-escaping as this letter is frequently used.
 */
goog.string.DETECT_DOUBLE_ESCAPING =
    goog.define('goog.string.DETECT_DOUBLE_ESCAPING', false);


/**
 * @define {boolean} Whether to force non-dom html unescaping.
 */
goog.string.FORCE_NON_DOM_HTML_UNESCAPING =
    goog.define('goog.string.FORCE_NON_DOM_HTML_UNESCAPING', false);


/**
 * Common Unicode string characters.
 * @enum {string}
 */
goog.string.Unicode = {
  NBSP: '\xa0',
  ZERO_WIDTH_SPACE: '\u200b'  // This is equivalent to <wbr>.
};


/**
 * Fast prefix-checker.
 * @param {string} str The string to check.
 * @param {string} prefix A string to look for at the start of `str`.
 * @return {boolean} True if `str` begins with `prefix`.
 */
goog.string.startsWith = goog.string.internal.startsWith;


/**
 * Fast suffix-checker.
 * @param {string} str The string to check.
 * @param {string} suffix A string to look for at the end of `str`.
 * @return {boolean} True if `str` ends with `suffix`.
 */
goog.string.endsWith = goog.string.internal.endsWith;


/**
 * Case-insensitive prefix-checker.
 * @param {string} str The string to check.
 * @param {string} prefix  A string to look for at the end of `str`.
 * @return {boolean} True if `str` begins with `prefix` (ignoring
 *     case).
 */
goog.string.caseInsensitiveStartsWith =
    goog.string.internal.caseInsensitiveStartsWith;


/**
 * Case-insensitive suffix-checker.
 * @param {string} str The string to check.
 * @param {string} suffix A string to look for at the end of `str`.
 * @return {boolean} True if `str` ends with `suffix` (ignoring
 *     case).
 */
goog.string.caseInsensitiveEndsWith =
    goog.string.internal.caseInsensitiveEndsWith;


/**
 * Case-insensitive equality checker.
 * @param {string} str1 First string to check.
 * @param {string} str2 Second string to check.
 * @return {boolean} True if `str1` and `str2` are the same string,
 *     ignoring case.
 */
goog.string.caseInsensitiveEquals = goog.string.internal.caseInsensitiveEquals;


/**
 * Does simple python-style string substitution.
 * subs("foo%s hot%s", "bar", "dog") becomes "foobar hotdog".
 * @param {string} str The string containing the pattern.
 * @param {...*} var_args The items to substitute into the pattern.
 * @return {string} A copy of `str` in which each occurrence of
 *     {@code %s} has been replaced an argument from `var_args`.
 */
goog.string.subs = function(str, var_args) {
  'use strict';
  const splitParts = str.split('%s');
  let returnString = '';

  const subsArguments = Array.prototype.slice.call(arguments, 1);
  while (subsArguments.length &&
         // Replace up to the last split part. We are inserting in the
         // positions between split parts.
         splitParts.length > 1) {
    returnString += splitParts.shift() + subsArguments.shift();
  }

  return returnString + splitParts.join('%s');  // Join unused '%s'
};


/**
 * Converts multiple whitespace chars (spaces, non-breaking-spaces, new lines
 * and tabs) to a single space, and strips leading and trailing whitespace.
 * @param {string} str Input string.
 * @return {string} A copy of `str` with collapsed whitespace.
 */
goog.string.collapseWhitespace = function(str) {
  'use strict';
  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
  // include it in the regexp to enforce consistent cross-browser behavior.
  return str.replace(/[\s\xa0]+/g, ' ').replace(/^\s+|\s+$/g, '');
};


/**
 * Checks if a string is empty or contains only whitespaces.
 * @param {string} str The string to check.
 * @return {boolean} Whether `str` is empty or whitespace only.
 */
goog.string.isEmptyOrWhitespace = goog.string.internal.isEmptyOrWhitespace;


/**
 * Checks if a string is empty.
 * @param {string} str The string to check.
 * @return {boolean} Whether `str` is empty.
 */
goog.string.isEmptyString = function(str) {
  'use strict';
  return str.length == 0;
};


/**
 * Checks if a string is empty or contains only whitespaces.
 *
 * @param {string} str The string to check.
 * @return {boolean} Whether `str` is empty or whitespace only.
 * @deprecated Use goog.string.isEmptyOrWhitespace instead.
 */
goog.string.isEmpty = goog.string.isEmptyOrWhitespace;


/**
 * Checks if a string is null, undefined, empty or contains only whitespaces.
 * @param {*} str The string to check.
 * @return {boolean} Whether `str` is null, undefined, empty, or
 *     whitespace only.
 * @deprecated Use goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str))
 *     instead.
 */
goog.string.isEmptyOrWhitespaceSafe = function(str) {
  'use strict';
  return goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str));
};


/**
 * Checks if a string is null, undefined, empty or contains only whitespaces.
 *
 * @param {*} str The string to check.
 * @return {boolean} Whether `str` is null, undefined, empty, or
 *     whitespace only.
 * @deprecated Use goog.string.isEmptyOrWhitespace instead.
 */
goog.string.isEmptySafe = goog.string.isEmptyOrWhitespaceSafe;


/**
 * Checks if a string is all breaking whitespace.
 * @param {string} str The string to check.
 * @return {boolean} Whether the string is all breaking whitespace.
 */
goog.string.isBreakingWhitespace = function(str) {
  'use strict';
  return !/[^\t\n\r ]/.test(str);
};


/**
 * Checks if a string contains all letters.
 * @param {string} str string to check.
 * @return {boolean} True if `str` consists entirely of letters.
 */
goog.string.isAlpha = function(str) {
  'use strict';
  return !/[^a-zA-Z]/.test(str);
};


/**
 * Checks if a string contains only numbers.
 * @param {*} str string to check. If not a string, it will be
 *     casted to one.
 * @return {boolean} True if `str` is numeric.
 */
goog.string.isNumeric = function(str) {
  'use strict';
  return !/[^0-9]/.test(str);
};


/**
 * Checks if a string contains only numbers or letters.
 * @param {string} str string to check.
 * @return {boolean} True if `str` is alphanumeric.
 */
goog.string.isAlphaNumeric = function(str) {
  'use strict';
  return !/[^a-zA-Z0-9]/.test(str);
};


/**
 * Checks if a character is a space character.
 * @param {string} ch Character to check.
 * @return {boolean} True if `ch` is a space.
 */
goog.string.isSpace = function(ch) {
  'use strict';
  return ch == ' ';
};


/**
 * Checks if a character is a valid unicode character.
 * @param {string} ch Character to check.
 * @return {boolean} True if `ch` is a valid unicode character.
 */
goog.string.isUnicodeChar = function(ch) {
  'use strict';
  return ch.length == 1 && ch >= ' ' && ch <= '~' ||
      ch >= '\u0080' && ch <= '\uFFFD';
};


/**
 * Takes a string and replaces newlines with a space. Multiple lines are
 * replaced with a single space.
 * @param {string} str The string from which to strip newlines.
 * @return {string} A copy of `str` stripped of newlines.
 */
goog.string.stripNewlines = function(str) {
  'use strict';
  return str.replace(/(\r\n|\r|\n)+/g, ' ');
};


/**
 * Replaces Windows and Mac new lines with unix style: \r or \r\n with \n.
 * @param {string} str The string to in which to canonicalize newlines.
 * @return {string} `str` A copy of {@code} with canonicalized newlines.
 */
goog.string.canonicalizeNewlines = function(str) {
  'use strict';
  return str.replace(/(\r\n|\r|\n)/g, '\n');
};


/**
 * Normalizes whitespace in a string, replacing all whitespace chars with
 * a space.
 * @param {string} str The string in which to normalize whitespace.
 * @return {string} A copy of `str` with all whitespace normalized.
 */
goog.string.normalizeWhitespace = function(str) {
  'use strict';
  return str.replace(/\xa0|\s/g, ' ');
};


/**
 * Normalizes spaces in a string, replacing all consecutive spaces and tabs
 * with a single space. Replaces non-breaking space with a space.
 * @param {string} str The string in which to normalize spaces.
 * @return {string} A copy of `str` with all consecutive spaces and tabs
 *    replaced with a single space.
 */
goog.string.normalizeSpaces = function(str) {
  'use strict';
  return str.replace(/\xa0|[ \t]+/g, ' ');
};


/**
 * Removes the breaking spaces from the left and right of the string and
 * collapses the sequences of breaking spaces in the middle into single spaces.
 * The original and the result strings render the same way in HTML.
 * @param {string} str A string in which to collapse spaces.
 * @return {string} Copy of the string with normalized breaking spaces.
 */
goog.string.collapseBreakingSpaces = function(str) {
  'use strict';
  return str.replace(/[\t\r\n ]+/g, ' ')
      .replace(/^[\t\r\n ]+|[\t\r\n ]+$/g, '');
};


/**
 * Trims white spaces to the left and right of a string.
 * @param {string} str The string to trim.
 * @return {string} A trimmed copy of `str`.
 */
goog.string.trim = goog.string.internal.trim;


/**
 * Trims whitespaces at the left end of a string.
 * @param {string} str The string to left trim.
 * @return {string} A trimmed copy of `str`.
 */
goog.string.trimLeft = function(str) {
  'use strict';
  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
  // include it in the regexp to enforce consistent cross-browser behavior.
  return str.replace(/^[\s\xa0]+/, '');
};


/**
 * Trims whitespaces at the right end of a string.
 * @param {string} str The string to right trim.
 * @return {string} A trimmed copy of `str`.
 */
goog.string.trimRight = function(str) {
  'use strict';
  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
  // include it in the regexp to enforce consistent cross-browser behavior.
  return str.replace(/[\s\xa0]+$/, '');
};


/**
 * A string comparator that ignores case.
 * -1 = str1 less than str2
 *  0 = str1 equals str2
 *  1 = str1 greater than str2
 *
 * @param {string} str1 The string to compare.
 * @param {string} str2 The string to compare `str1` to.
 * @return {number} The comparator result, as described above.
 */
goog.string.caseInsensitiveCompare =
    goog.string.internal.caseInsensitiveCompare;


/**
 * Compares two strings interpreting their numeric substrings as numbers.
 *
 * @param {string} str1 First string.
 * @param {string} str2 Second string.
 * @param {!RegExp} tokenizerRegExp Splits a string into substrings of
 *     non-negative integers, non-numeric characters and optionally fractional
 *     numbers starting with a decimal point.
 * @return {number} Negative if str1 < str2, 0 is str1 == str2, positive if
 *     str1 > str2.
 * @private
 */
goog.string.numberAwareCompare_ = function(str1, str2, tokenizerRegExp) {
  'use strict';
  if (str1 == str2) {
    return 0;
  }
  if (!str1) {
    return -1;
  }
  if (!str2) {
    return 1;
  }

  // Using match to split the entire string ahead of time turns out to be faster
  // for most inputs than using RegExp.exec or iterating over each character.
  const tokens1 = str1.toLowerCase().match(tokenizerRegExp);
  const tokens2 = str2.toLowerCase().match(tokenizerRegExp);

  const count = Math.min(tokens1.length, tokens2.length);

  for (let i = 0; i < count; i++) {
    const a = tokens1[i];
    const b = tokens2[i];

    // Compare pairs of tokens, returning if one token sorts before the other.
    if (a != b) {
      // Only if both tokens are integers is a special comparison required.
      // Decimal numbers are sorted as strings (e.g., '.09' < '.1').
      const num1 = parseInt(a, 10);
      if (!isNaN(num1)) {
        const num2 = parseInt(b, 10);
        if (!isNaN(num2) && num1 - num2) {
          return num1 - num2;
        }
      }
      return a < b ? -1 : 1;
    }
  }

  // If one string is a substring of the other, the shorter string sorts first.
  if (tokens1.length != tokens2.length) {
    return tokens1.length - tokens2.length;
  }

  // The two strings must be equivalent except for case (perfect equality is
  // tested at the head of the function.) Revert to default ASCII string
  // comparison to stabilize the sort.
  return str1 < str2 ? -1 : 1;
};


/**
 * String comparison function that handles non-negative integer numbers in a
 * way humans might expect. Using this function, the string 'File 2.jpg' sorts
 * before 'File 10.jpg', and 'Version 1.9' before 'Version 1.10'. The comparison
 * is mostly case-insensitive, though strings that are identical except for case
 * are sorted with the upper-case strings before lower-case.
 *
 * This comparison function is up to 50x slower than either the default or the
 * case-insensitive compare. It should not be used in time-critical code, but
 * should be fast enough to sort several hundred short strings (like filenames)
 * with a reasonable delay.
 *
 * @param {string} str1 The string to compare in a numerically sensitive way.
 * @param {string} str2 The string to compare `str1` to.
 * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than
 *     0 if str1 > str2.
 */
goog.string.intAwareCompare = function(str1, str2) {
  'use strict';
  return goog.string.numberAwareCompare_(str1, str2, /\d+|\D+/g);
};


/**
 * String comparison function that handles non-negative integer and fractional
 * numbers in a way humans might expect. Using this function, the string
 * 'File 2.jpg' sorts before 'File 10.jpg', and '3.14' before '3.2'. Equivalent
 * to {@link goog.string.intAwareCompare} apart from the way how it interprets
 * dots.
 *
 * @param {string} str1 The string to compare in a numerically sensitive way.
 * @param {string} str2 The string to compare `str1` to.
 * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than
 *     0 if str1 > str2.
 */
goog.string.floatAwareCompare = function(str1, str2) {
  'use strict';
  return goog.string.numberAwareCompare_(str1, str2, /\d+|\.\d+|\D+/g);
};


/**
 * Alias for {@link goog.string.floatAwareCompare}.
 *
 * @param {string} str1
 * @param {string} str2
 * @return {number}
 */
goog.string.numerateCompare = goog.string.floatAwareCompare;


/**
 * URL-encodes a string
 * @param {*} str The string to url-encode.
 * @return {string} An encoded copy of `str` that is safe for urls.
 *     Note that '#', ':', and other characters used to delimit portions
 *     of URLs *will* be encoded.
 */
goog.string.urlEncode = function(str) {
  'use strict';
  return encodeURIComponent(String(str));
};


/**
 * URL-decodes the string. We need to specially handle '+'s because
 * the javascript library doesn't convert them to spaces.
 * @param {string} str The string to url decode.
 * @return {string} The decoded `str`.
 */
goog.string.urlDecode = function(str) {
  'use strict';
  return decodeURIComponent(str.replace(/\+/g, ' '));
};


/**
 * Converts \n to <br>s or <br />s.
 * @param {string} str The string in which to convert newlines.
 * @param {boolean=} opt_xml Whether to use XML compatible tags.
 * @return {string} A copy of `str` with converted newlines.
 */
goog.string.newLineToBr = goog.string.internal.newLineToBr;


/**
 * Escapes double quote '"' and single quote '\'' characters in addition to
 * '&', '<', and '>' so that a string can be included in an HTML tag attribute
 * value within double or single quotes.
 *
 * It should be noted that > doesn't need to be escaped for the HTML or XML to
 * be valid, but it has been decided to escape it for consistency with other
 * implementations.
 *
 * With goog.string.DETECT_DOUBLE_ESCAPING, this function escapes also the
 * lowercase letter "e".
 *
 * NOTE(user):
 * HtmlEscape is often called during the generation of large blocks of HTML.
 * Using statics for the regular expressions and strings is an optimization
 * that can more than half the amount of time IE spends in this function for
 * large apps, since strings and regexes both contribute to GC allocations.
 *
 * Testing for the presence of a character before escaping increases the number
 * of function calls, but actually provides a speed increase for the average
 * case -- since the average case often doesn't require the escaping of all 4
 * characters and indexOf() is much cheaper than replace().
 * The worst case does suffer slightly from the additional calls, therefore the
 * opt_isLikelyToContainHtmlChars option has been included for situations
 * where all 4 HTML entities are very likely to be present and need escaping.
 *
 * Some benchmarks (times tended to fluctuate +-0.05ms):
 *                                     FireFox                     IE6
 * (no chars / average (mix of cases) / all 4 chars)
 * no checks                     0.13 / 0.22 / 0.22         0.23 / 0.53 / 0.80
 * indexOf                       0.08 / 0.17 / 0.26         0.22 / 0.54 / 0.84
 * indexOf + re test             0.07 / 0.17 / 0.28         0.19 / 0.50 / 0.85
 *
 * An additional advantage of checking if replace actually needs to be called
 * is a reduction in the number of object allocations, so as the size of the
 * application grows the difference between the various methods would increase.
 *
 * @param {string} str string to be escaped.
 * @param {boolean=} opt_isLikelyToContainHtmlChars Don't perform a check to see
 *     if the character needs replacing - use this option if you expect each of
 *     the characters to appear often. Leave false if you expect few html
 *     characters to occur in your strings, such as if you are escaping HTML.
 * @return {string} An escaped copy of `str`.
 */
goog.string.htmlEscape = function(str, opt_isLikelyToContainHtmlChars) {
  'use strict';
  str = goog.string.internal.htmlEscape(str, opt_isLikelyToContainHtmlChars);
  if (goog.string.DETECT_DOUBLE_ESCAPING) {
    str = str.replace(goog.string.E_RE_, '&#101;');
  }
  return str;
};


/**
 * Regular expression that matches a lowercase letter "e", for use in escaping.
 * @const {!RegExp}
 * @private
 */
goog.string.E_RE_ = /e/g;


/**
 * Unescapes an HTML string.
 *
 * @param {string} str The string to unescape.
 * @return {string} An unescaped copy of `str`.
 */
goog.string.unescapeEntities = function(str) {
  'use strict';
  if (goog.string.contains(str, '&')) {
    // We are careful not to use a DOM if we do not have one or we explicitly
    // requested non-DOM html unescaping.
    if (!goog.string.FORCE_NON_DOM_HTML_UNESCAPING &&
        'document' in goog.global) {
      return goog.string.unescapeEntitiesUsingDom_(str);
    } else {
      // Fall back on pure XML entities
      return goog.string.unescapePureXmlEntities_(str);
    }
  }
  return str;
};


/**
 * Unescapes a HTML string using the provided document.
 *
 * @param {string} str The string to unescape.
 * @param {!Document} document A document to use in escaping the string.
 * @return {string} An unescaped copy of `str`.
 */
goog.string.unescapeEntitiesWithDocument = function(str, document) {
  'use strict';
  if (goog.string.contains(str, '&')) {
    return goog.string.unescapeEntitiesUsingDom_(str, document);
  }
  return str;
};


/**
 * Unescapes an HTML string using a DOM to resolve non-XML, non-numeric
 * entities. This function is XSS-safe and whitespace-preserving.
 * @private
 * @param {string} str The string to unescape.
 * @param {Document=} opt_document An optional document to use for creating
 *     elements. If this is not specified then the default window.document
 *     will be used.
 * @return {string} The unescaped `str` string.
 */
goog.string.unescapeEntitiesUsingDom_ = function(str, opt_document) {
  'use strict';
  /** @type {!Object<string, string>} */
  const seen = {'&amp;': '&', '&lt;': '<', '&gt;': '>', '&quot;': '"'};
  /** @type {!Element} */
  let div;
  if (opt_document) {
    div = opt_document.createElement('div');
  } else {
    div = goog.global.document.createElement('div');
  }
  // Match as many valid entity characters as possible. If the actual entity
  // happens to be shorter, it will still work as innerHTML will return the
  // trailing characters unchanged. Since the entity characters do not include
  // open angle bracket, there is no chance of XSS from the innerHTML use.
  // Since no whitespace is passed to innerHTML, whitespace is preserved.
  return str.replace(goog.string.HTML_ENTITY_PATTERN_, function(s, entity) {
    'use strict';
    // Check for cached entity.
    let value = seen[s];
    if (value) {
      return value;
    }
    // Check for numeric entity.
    if (entity.charAt(0) == '#') {
      // Prefix with 0 so that hex entities (e.g. &#x10) parse as hex numbers.
      const n = Number('0' + entity.slice(1));
      if (!isNaN(n)) {
        value = String.fromCharCode(n);
      }
    }
    // Fall back to innerHTML otherwise.
    if (!value) {
      // Append a non-entity character to avoid a bug in Webkit that parses
      // an invalid entity at the end of innerHTML text as the empty string.
      goog.dom.safe.setInnerHtml(
          div,
          goog.html.uncheckedconversions
              .safeHtmlFromStringKnownToSatisfyTypeContract(
                  goog.string.Const.from('Single HTML entity.'), s + ' '));
      // Then remove the trailing character from the result.
      value = div.firstChild.nodeValue.slice(0, -1);
    }
    // Cache and return.
    return seen[s] = value;
  });
};


/**
 * Unescapes XML entities.
 * @private
 * @param {string} str The string to unescape.
 * @return {string} An unescaped copy of `str`.
 */
goog.string.unescapePureXmlEntities_ = function(str) {
  'use strict';
  return str.replace(/&([^;]+);/g, function(s, entity) {
    'use strict';
    switch (entity) {
      case 'amp':
        return '&';
      case 'lt':
        return '<';
      case 'gt':
        return '>';
      case 'quot':
        return '"';
      default:
        if (entity.charAt(0) == '#') {
          // Prefix with 0 so that hex entities (e.g. &#x10) parse as hex.
          const n = Number('0' + entity.slice(1));
          if (!isNaN(n)) {
            return String.fromCharCode(n);
          }
        }
        // For invalid entities we just return the entity
        return s;
    }
  });
};


/**
 * Regular expression that matches an HTML entity.
 * See also HTML5: Tokenization / Tokenizing character references.
 * @private
 * @type {!RegExp}
 */
goog.string.HTML_ENTITY_PATTERN_ = /&([^;\s<&]+);?/g;


/**
 * Do escaping of whitespace to preserve spatial formatting. We use character
 * entity #160 to make it safer for xml.
 * @param {string} str The string in which to escape whitespace.
 * @param {boolean=} opt_xml Whether to use XML compatible tags.
 * @return {string} An escaped copy of `str`.
 */
goog.string.whitespaceEscape = function(str, opt_xml) {
  'use strict';
  // This doesn't use goog.string.preserveSpaces for backwards compatibility.
  return goog.string.newLineToBr(str.replace(/  /g, ' &#160;'), opt_xml);
};


/**
 * Preserve spaces that would be otherwise collapsed in HTML by replacing them
 * with non-breaking space Unicode characters.
 * @param {string} str The string in which to preserve whitespace.
 * @return {string} A copy of `str` with preserved whitespace.
 */
goog.string.preserveSpaces = function(str) {
  'use strict';
  return str.replace(/(^|[\n ]) /g, '$1' + goog.string.Unicode.NBSP);
};


/**
 * Strip quote characters around a string.  The second argument is a string of
 * characters to treat as quotes.  This can be a single character or a string of
 * multiple character and in that case each of those are treated as possible
 * quote characters. For example:
 *
 * <pre>
 * goog.string.stripQuotes('"abc"', '"`') --> 'abc'
 * goog.string.stripQuotes('`abc`', '"`') --> 'abc'
 * </pre>
 *
 * @param {string} str The string to strip.
 * @param {string} quoteChars The quote characters to strip.
 * @return {string} A copy of `str` without the quotes.
 */
goog.string.stripQuotes = function(str, quoteChars) {
  'use strict';
  const length = quoteChars.length;
  for (let i = 0; i < length; i++) {
    const quoteChar = length == 1 ? quoteChars : quoteChars.charAt(i);
    if (str.charAt(0) == quoteChar && str.charAt(str.length - 1) == quoteChar) {
      return str.substring(1, str.length - 1);
    }
  }
  return str;
};


/**
 * Truncates a string to a certain length and adds '...' if necessary.  The
 * length also accounts for the ellipsis, so a maximum length of 10 and a string
 * 'Hello World!' produces 'Hello W...'.
 * @param {string} str The string to truncate.
 * @param {number} chars Max number of characters.
 * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped
 *     characters from being cut off in the middle.
 * @return {string} The truncated `str` string.
 */
goog.string.truncate = function(str, chars, opt_protectEscapedCharacters) {
  'use strict';
  if (opt_protectEscapedCharacters) {
    str = goog.string.unescapeEntities(str);
  }

  if (str.length > chars) {
    str = str.substring(0, chars - 3) + '...';
  }

  if (opt_protectEscapedCharacters) {
    str = goog.string.htmlEscape(str);
  }

  return str;
};


/**
 * Truncate a string in the middle, adding "..." if necessary,
 * and favoring the beginning of the string.
 * @param {string} str The string to truncate the middle of.
 * @param {number} chars Max number of characters.
 * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped
 *     characters from being cutoff in the middle.
 * @param {number=} opt_trailingChars Optional number of trailing characters to
 *     leave at the end of the string, instead of truncating as close to the
 *     middle as possible.
 * @return {string} A truncated copy of `str`.
 */
goog.string.truncateMiddle = function(
    str, chars, opt_protectEscapedCharacters, opt_trailingChars) {
  'use strict';
  if (opt_protectEscapedCharacters) {
    str = goog.string.unescapeEntities(str);
  }

  if (opt_trailingChars && str.length > chars) {
    if (opt_trailingChars > chars) {
      opt_trailingChars = chars;
    }
    const endPoint = str.length - opt_trailingChars;
    const startPoint = chars - opt_trailingChars;
    str = str.substring(0, startPoint) + '...' + str.substring(endPoint);
  } else if (str.length > chars) {
    // Favor the beginning of the string:
    let half = Math.floor(chars / 2);
    const endPos = str.length - half;
    half += chars % 2;
    str = str.substring(0, half) + '...' + str.substring(endPos);
  }

  if (opt_protectEscapedCharacters) {
    str = goog.string.htmlEscape(str);
  }

  return str;
};


/**
 * Special chars that need to be escaped for goog.string.quote.
 * @private {!Object<string, string>}
 */
goog.string.specialEscapeChars_ = {
  '\0': '\\0',
  '\b': '\\b',
  '\f': '\\f',
  '\n': '\\n',
  '\r': '\\r',
  '\t': '\\t',
  '\x0B': '\\x0B',  // '\v' is not supported in JScript
  '"': '\\"',
  '\\': '\\\\',
  // To support the use case of embedding quoted strings inside of script
  // tags, we have to make sure HTML comments and opening/closing script tags do
  // not appear in the resulting string. The specific strings that must be
  // escaped are documented at:
  // https://html.spec.whatwg.org/multipage/scripting.html#restrictions-for-contents-of-script-elements
  '<': '\\u003C'  // NOTE: JSON.parse crashes on '\\x3c'.
};


/**
 * Character mappings used internally for goog.string.escapeChar.
 * @private {!Object<string, string>}
 */
goog.string.jsEscapeCache_ = {
  '\'': '\\\''
};


/**
 * Encloses a string in double quotes and escapes characters so that the
 * string is a valid JS string. The resulting string is safe to embed in
 * `<script>` tags as "<" is escaped.
 * @param {string} s The string to quote.
 * @return {string} A copy of `s` surrounded by double quotes.
 */
goog.string.quote = function(s) {
  'use strict';
  s = String(s);
  const sb = ['"'];
  for (let i = 0; i < s.length; i++) {
    const ch = s.charAt(i);
    const cc = ch.charCodeAt(0);
    sb[i + 1] = goog.string.specialEscapeChars_[ch] ||
        ((cc > 31 && cc < 127) ? ch : goog.string.escapeChar(ch));
  }
  sb.push('"');
  return sb.join('');
};


/**
 * Takes a string and returns the escaped string for that input string.
 * @param {string} str The string to escape.
 * @return {string} An escaped string representing `str`.
 */
goog.string.escapeString = function(str) {
  'use strict';
  const sb = [];
  for (let i = 0; i < str.length; i++) {
    sb[i] = goog.string.escapeChar(str.charAt(i));
  }
  return sb.join('');
};


/**
 * Takes a character and returns the escaped string for that character. For
 * example escapeChar(String.fromCharCode(15)) -> "\\x0E".
 * @param {string} c The character to escape.
 * @return {string} An escaped string representing `c`.
 */
goog.string.escapeChar = function(c) {
  'use strict';
  if (c in goog.string.jsEscapeCache_) {
    return goog.string.jsEscapeCache_[c];
  }

  if (c in goog.string.specialEscapeChars_) {
    return goog.string.jsEscapeCache_[c] = goog.string.specialEscapeChars_[c];
  }

  let rv = c;
  const cc = c.charCodeAt(0);
  if (cc > 31 && cc < 127) {
    rv = c;
  } else {
    // tab is 9 but handled above
    if (cc < 256) {
      rv = '\\x';
      if (cc < 16 || cc > 256) {
        rv += '0';
      }
    } else {
      rv = '\\u';
      if (cc < 4096) {  // \u1000
        rv += '0';
      }
    }
    rv += cc.toString(16).toUpperCase();
  }

  return goog.string.jsEscapeCache_[c] = rv;
};


/**
 * Determines whether a string contains a substring.
 * @param {string} str The string to search.
 * @param {string} subString The substring to search for.
 * @return {boolean} Whether `str` contains `subString`.
 */
goog.string.contains = goog.string.internal.contains;


/**
 * Determines whether a string contains a substring, ignoring case.
 * @param {string} str The string to search.
 * @param {string} subString The substring to search for.
 * @return {boolean} Whether `str` contains `subString`.
 */
goog.string.caseInsensitiveContains =
    goog.string.internal.caseInsensitiveContains;


/**
 * Returns the non-overlapping occurrences of ss in s.
 * If either s or ss evalutes to false, then returns zero.
 * @param {string} s The string to look in.
 * @param {string} ss The string to look for.
 * @return {number} Number of occurrences of ss in s.
 */
goog.string.countOf = function(s, ss) {
  'use strict';
  return s && ss ? s.split(ss).length - 1 : 0;
};


/**
 * Removes a substring of a specified length at a specific
 * index in a string.
 * @param {string} s The base string from which to remove.
 * @param {number} index The index at which to remove the substring.
 * @param {number} stringLength The length of the substring to remove.
 * @return {string} A copy of `s` with the substring removed or the full
 *     string if nothing is removed or the input is invalid.
 */
goog.string.removeAt = function(s, index, stringLength) {
  'use strict';
  let resultStr = s;
  // If the index is greater or equal to 0 then remove substring
  if (index >= 0 && index < s.length && stringLength > 0) {
    resultStr = s.slice(0, index) + s.slice(index + stringLength);
  }
  return resultStr;
};


/**
 * Removes the first occurrence of a substring from a string.
 * @param {string} str The base string from which to remove.
 * @param {string} substr The string to remove.
 * @return {string} A copy of `str` with `substr` removed or the
 *     full string if nothing is removed.
 */
goog.string.remove = function(str, substr) {
  'use strict';
  return str.replace(substr, '');
};


/**
 *  Removes all occurrences of a substring from a string.
 *  @param {string} s The base string from which to remove.
 *  @param {string} ss The string to remove.
 *  @return {string} A copy of `s` with `ss` removed or the full
 *      string if nothing is removed.
 */
goog.string.removeAll = function(s, ss) {
  'use strict';
  const re = new RegExp(goog.string.regExpEscape(ss), 'g');
  return s.replace(re, '');
};


/**
 *  Replaces all occurrences of a substring of a string with a new substring.
 *  @param {string} s The base string from which to remove.
 *  @param {string} ss The string to replace.
 *  @param {string} replacement The replacement string.
 *  @return {string} A copy of `s` with `ss` replaced by
 *      `replacement` or the original string if nothing is replaced.
 */
goog.string.replaceAll = function(s, ss, replacement) {
  'use strict';
  const re = new RegExp(goog.string.regExpEscape(ss), 'g');
  return s.replace(re, replacement.replace(/\$/g, '$$$$'));
};


/**
 * Escapes characters in the string that are not safe to use in a RegExp.
 * @param {*} s The string to escape. If not a string, it will be casted
 *     to one.
 * @return {string} A RegExp safe, escaped copy of `s`.
 */
goog.string.regExpEscape = function(s) {
  'use strict';
  return String(s)
      .replace(/([-()\[\]{}+?*.$\^|,:#<!\\])/g, '\\$1')
      .replace(/\x08/g, '\\x08');
};


/**
 * Repeats a string n times.
 * @param {string} string The string to repeat.
 * @param {number} length The number of times to repeat.
 * @return {string} A string containing `length` repetitions of
 *     `string`.
 */
goog.string.repeat = (String.prototype.repeat) ? function(string, length) {
  'use strict';
  // The native method is over 100 times faster than the alternative.
  return string.repeat(length);
} : function(string, length) {
  'use strict';
  return new Array(length + 1).join(string);
};


/**
 * Pads number to given length and optionally rounds it to a given precision.
 * For example:
 * <pre>padNumber(1.25, 2, 3) -> '01.250'
 * padNumber(1.25, 2) -> '01.25'
 * padNumber(1.25, 2, 1) -> '01.3'
 * padNumber(1.25, 0) -> '1.25'</pre>
 *
 * @param {number} num The number to pad.
 * @param {number} length The desired length.
 * @param {number=} opt_precision The desired precision.
 * @return {string} `num` as a string with the given options.
 */
goog.string.padNumber = function(num, length, opt_precision) {
  'use strict';
  if (!Number.isFinite(num)) return String(num);
  let s =
      (opt_precision !== undefined) ? num.toFixed(opt_precision) : String(num);
  let index = s.indexOf('.');
  if (index === -1) {
    index = s.length;
  }
  const sign = s[0] === '-' ? '-' : '';
  if (sign) {
    s = s.substring(1);
  }
  return sign + goog.string.repeat('0', Math.max(0, length - index)) + s;
};


/**
 * Returns a string representation of the given object, with
 * null and undefined being returned as the empty string.
 *
 * @param {*} obj The object to convert.
 * @return {string} A string representation of the `obj`.
 */
goog.string.makeSafe = function(obj) {
  'use strict';
  return obj == null ? '' : String(obj);
};

/**
 * Returns a string with at least 64-bits of randomness.
 *
 * Doesn't trust JavaScript's random function entirely. Uses a combination of
 * random and current timestamp, and then encodes the string in base-36 to
 * make it shorter.
 *
 * @return {string} A random string, e.g. sn1s7vb4gcic.
 */
goog.string.getRandomString = function() {
  'use strict';
  const x = 2147483648;
  return Math.floor(Math.random() * x).toString(36) +
      Math.abs(Math.floor(Math.random() * x) ^ Date.now()).toString(36);
};


/**
 * Compares two version numbers.
 *
 * @param {string|number} version1 Version of first item.
 * @param {string|number} version2 Version of second item.
 *
 * @return {number}  1 if `version1` is higher.
 *                   0 if arguments are equal.
 *                  -1 if `version2` is higher.
 */
goog.string.compareVersions = goog.string.internal.compareVersions;


/**
 * String hash function similar to java.lang.String.hashCode().
 * The hash code for a string is computed as
 * s[0] * 31 ^ (n - 1) + s[1] * 31 ^ (n - 2) + ... + s[n - 1],
 * where s[i] is the ith character of the string and n is the length of
 * the string. We mod the result to make it between 0 (inclusive) and 2^32
 * (exclusive).
 * @param {string} str A string.
 * @return {number} Hash value for `str`, between 0 (inclusive) and 2^32
 *  (exclusive). The empty string returns 0.
 */
goog.string.hashCode = function(str) {
  'use strict';
  let result = 0;
  for (let i = 0; i < str.length; ++i) {
    // Normalize to 4 byte range, 0 ... 2^32.
    result = (31 * result + str.charCodeAt(i)) >>> 0;
  }
  return result;
};


/**
 * The most recent unique ID. |0 is equivalent to Math.floor in this case.
 * @type {number}
 * @private
 */
goog.string.uniqueStringCounter_ = Math.random() * 0x80000000 | 0;


/**
 * Generates and returns a string which is unique in the current document.
 * This is useful, for example, to create unique IDs for DOM elements.
 * @return {string} A unique id.
 */
goog.string.createUniqueString = function() {
  'use strict';
  return 'goog_' + goog.string.uniqueStringCounter_++;
};


/**
 * Converts the supplied string to a number, which may be Infinity or NaN.
 * This function strips whitespace: (toNumber(' 123') === 123)
 * This function accepts scientific notation: (toNumber('1e1') === 10)
 *
 * This is better than JavaScript's built-in conversions because, sadly:
 *     (Number(' ') === 0) and (parseFloat('123a') === 123)
 *
 * @param {string} str The string to convert.
 * @return {number} The number the supplied string represents, or NaN.
 */
goog.string.toNumber = function(str) {
  'use strict';
  const num = Number(str);
  if (num == 0 && goog.string.isEmptyOrWhitespace(str)) {
    return NaN;
  }
  return num;
};


/**
 * Returns whether the given string is lower camel case (e.g. "isFooBar").
 *
 * Note that this assumes the string is entirely letters.
 * @see http://en.wikipedia.org/wiki/CamelCase#Variations_and_synonyms
 *
 * @param {string} str String to test.
 * @return {boolean} Whether the string is lower camel case.
 */
goog.string.isLowerCamelCase = function(str) {
  'use strict';
  return /^[a-z]+([A-Z][a-z]*)*$/.test(str);
};


/**
 * Returns whether the given string is upper camel case (e.g. "FooBarBaz").
 *
 * Note that this assumes the string is entirely letters.
 * @see http://en.wikipedia.org/wiki/CamelCase#Variations_and_synonyms
 *
 * @param {string} str String to test.
 * @return {boolean} Whether the string is upper camel case.
 */
goog.string.isUpperCamelCase = function(str) {
  'use strict';
  return /^([A-Z][a-z]*)+$/.test(str);
};


/**
 * Converts a string from selector-case to camelCase (e.g. from
 * "multi-part-string" to "multiPartString"), useful for converting
 * CSS selectors and HTML dataset keys to their equivalent JS properties.
 * @param {string} str The string in selector-case form.
 * @return {string} The string in camelCase form.
 */
goog.string.toCamelCase = function(str) {
  'use strict';
  return String(str).replace(/\-([a-z])/g, function(all, match) {
    'use strict';
    return match.toUpperCase();
  });
};


/**
 * Converts a string from camelCase to selector-case (e.g. from
 * "multiPartString" to "multi-part-string"), useful for converting JS
 * style and dataset properties to equivalent CSS selectors and HTML keys.
 * @param {string} str The string in camelCase form.
 * @return {string} The string in selector-case form.
 */
goog.string.toSelectorCase = function(str) {
  'use strict';
  return String(str).replace(/([A-Z])/g, '-$1').toLowerCase();
};


/**
 * Converts a string into TitleCase. First character of the string is always
 * capitalized in addition to the first letter of every subsequent word.
 * Words are delimited by one or more whitespaces by default. Custom delimiters
 * can optionally be specified to replace the default, which doesn't preserve
 * whitespace delimiters and instead must be explicitly included if needed.
 *
 * Default delimiter => " ":
 *    goog.string.toTitleCase('oneTwoThree')    => 'OneTwoThree'
 *    goog.string.toTitleCase('one two three')  => 'One Two Three'
 *    goog.string.toTitleCase('  one   two   ') => '  One   Two   '
 *    goog.string.toTitleCase('one_two_three')  => 'One_two_three'
 *    goog.string.toTitleCase('one-two-three')  => 'One-two-three'
 *
 * Custom delimiter => "_-.":
 *    goog.string.toTitleCase('oneTwoThree', '_-.')       => 'OneTwoThree'
 *    goog.string.toTitleCase('one two three', '_-.')     => 'One two three'
 *    goog.string.toTitleCase('  one   two   ', '_-.')    => '  one   two   '
 *    goog.string.toTitleCase('one_two_three', '_-.')     => 'One_Two_Three'
 *    goog.string.toTitleCase('one-two-three', '_-.')     => 'One-Two-Three'
 *    goog.string.toTitleCase('one...two...three', '_-.') => 'One...Two...Three'
 *    goog.string.toTitleCase('one. two. three', '_-.')   => 'One. two. three'
 *    goog.string.toTitleCase('one-two.three', '_-.')     => 'One-Two.Three'
 *
 * @param {string} str String value in camelCase form.
 * @param {string=} opt_delimiters Custom delimiter character set used to
 *      distinguish words in the string value. Each character represents a
 *      single delimiter. When provided, default whitespace delimiter is
 *      overridden and must be explicitly included if needed.
 * @return {string} String value in TitleCase form.
 */
goog.string.toTitleCase = function(str, opt_delimiters) {
  'use strict';
  let delimiters = (typeof opt_delimiters === 'string') ?
      goog.string.regExpEscape(opt_delimiters) :
      '\\s';

  // For IE8, we need to prevent using an empty character set. Otherwise,
  // incorrect matching will occur.
  delimiters = delimiters ? '|[' + delimiters + ']+' : '';

  const regexp = new RegExp('(^' + delimiters + ')([a-z])', 'g');
  return str.replace(regexp, function(all, p1, p2) {
    'use strict';
    return p1 + p2.toUpperCase();
  });
};


/**
 * Capitalizes a string, i.e. converts the first letter to uppercase
 * and all other letters to lowercase, e.g.:
 *
 * goog.string.capitalize('one')     => 'One'
 * goog.string.capitalize('ONE')     => 'One'
 * goog.string.capitalize('one two') => 'One two'
 *
 * Note that this function does not trim initial whitespace.
 *
 * @param {string} str String value to capitalize.
 * @return {string} String value with first letter in uppercase.
 */
goog.string.capitalize = function(str) {
  'use strict';
  return String(str.charAt(0)).toUpperCase() +
      String(str.slice(1)).toLowerCase();
};


/**
 * Parse a string in decimal or hexidecimal ('0xFFFF') form.
 *
 * To parse a particular radix, please use parseInt(string, radix) directly. See
 * https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/parseInt
 *
 * This is a wrapper for the built-in parseInt function that will only parse
 * numbers as base 10 or base 16.  Some JS implementations assume strings
 * starting with "0" are intended to be octal. ES3 allowed but discouraged
 * this behavior. ES5 forbids it.  This function emulates the ES5 behavior.
 *
 * For more information, see Mozilla JS Reference: http://goo.gl/8RiFj
 *
 * @param {string|number|null|undefined} value The value to be parsed.
 * @return {number} The number, parsed. If the string failed to parse, this
 *     will be NaN.
 */
goog.string.parseInt = function(value) {
  'use strict';
  // Force finite numbers to strings.
  if (isFinite(value)) {
    value = String(value);
  }

  if (typeof value === 'string') {
    // If the string starts with '0x' or '-0x', parse as hex.
    return /^\s*-?0x/i.test(value) ? parseInt(value, 16) : parseInt(value, 10);
  }

  return NaN;
};


/**
 * Splits a string on a separator a limited number of times.
 *
 * This implementation is more similar to Python or Java, where the limit
 * parameter specifies the maximum number of splits rather than truncating
 * the number of results.
 *
 * See http://docs.python.org/2/library/stdtypes.html#str.split
 * See JavaDoc: http://goo.gl/F2AsY
 * See Mozilla reference: http://goo.gl/dZdZs
 *
 * @param {string} str String to split.
 * @param {string} separator The separator.
 * @param {number} limit The limit to the number of splits. The resulting array
 *     will have a maximum length of limit+1.  Negative numbers are the same
 *     as zero.
 * @return {!Array<string>} The string, split.
 */
goog.string.splitLimit = function(str, separator, limit) {
  'use strict';
  const parts = str.split(separator);
  const returnVal = [];

  // Only continue doing this while we haven't hit the limit and we have
  // parts left.
  while (limit > 0 && parts.length) {
    returnVal.push(parts.shift());
    limit--;
  }

  // If there are remaining parts, append them to the end.
  if (parts.length) {
    returnVal.push(parts.join(separator));
  }

  return returnVal;
};


/**
 * Finds the characters to the right of the last instance of any separator
 *
 * This function is similar to goog.string.path.baseName, except it can take a
 * list of characters to split the string on. It will return the rightmost
 * grouping of characters to the right of any separator as a left-to-right
 * oriented string.
 *
 * @see goog.string.path.baseName
 * @param {string} str The string
 * @param {string|!Array<string>} separators A list of separator characters
 * @return {string} The last part of the string with respect to the separators
 */
goog.string.lastComponent = function(str, separators) {
  'use strict';
  if (!separators) {
    return str;
  } else if (typeof separators == 'string') {
    separators = [separators];
  }

  let lastSeparatorIndex = -1;
  for (let i = 0; i < separators.length; i++) {
    if (separators[i] == '') {
      continue;
    }
    const currentSeparatorIndex = str.lastIndexOf(separators[i]);
    if (currentSeparatorIndex > lastSeparatorIndex) {
      lastSeparatorIndex = currentSeparatorIndex;
    }
  }
  if (lastSeparatorIndex == -1) {
    return str;
  }
  return str.slice(lastSeparatorIndex + 1);
};


/**
 * Computes the Levenshtein edit distance between two strings.
 * @param {string} a
 * @param {string} b
 * @return {number} The edit distance between the two strings.
 */
goog.string.editDistance = function(a, b) {
  'use strict';
  const v0 = [];
  const v1 = [];

  if (a == b) {
    return 0;
  }

  if (!a.length || !b.length) {
    return Math.max(a.length, b.length);
  }

  for (let i = 0; i < b.length + 1; i++) {
    v0[i] = i;
  }

  for (let i = 0; i < a.length; i++) {
    v1[0] = i + 1;

    for (let j = 0; j < b.length; j++) {
      const cost = Number(a[i] != b[j]);
      // Cost for the substring is the minimum of adding one character, removing
      // one character, or a swap.
      v1[j + 1] = Math.min(v1[j] + 1, v0[j + 1] + 1, v0[j] + cost);
    }

    for (let j = 0; j < v0.length; j++) {
      v0[j] = v1[j];
    }
  }

  return v1[b.length];
};