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/**
* @license
* Copyright The Closure Library Authors.
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @fileoverview String functions called from Closure packages that couldn't
* depend on each other. Outside Closure, use goog.string function which
* delegate to these.
*/
goog.provide('goog.string.internal');
/**
* 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`.
* @see goog.string.startsWith
*/
goog.string.internal.startsWith = function(str, prefix) {
'use strict';
return str.lastIndexOf(prefix, 0) == 0;
};
/**
* 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`.
* @see goog.string.endsWith
*/
goog.string.internal.endsWith = function(str, suffix) {
'use strict';
const l = str.length - suffix.length;
return l >= 0 && str.indexOf(suffix, l) == l;
};
/**
* 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).
* @see goog.string.caseInsensitiveStartsWith
*/
goog.string.internal.caseInsensitiveStartsWith = function(str, prefix) {
'use strict';
return goog.string.internal.caseInsensitiveCompare(
prefix, str.substr(0, prefix.length)) == 0;
};
/**
* 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).
* @see goog.string.caseInsensitiveEndsWith
*/
goog.string.internal.caseInsensitiveEndsWith = function(str, suffix) {
'use strict';
return (
goog.string.internal.caseInsensitiveCompare(
suffix, str.substr(str.length - suffix.length, suffix.length)) == 0);
};
/**
* 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.
* @see goog.string.caseInsensitiveEquals
*/
goog.string.internal.caseInsensitiveEquals = function(str1, str2) {
'use strict';
return str1.toLowerCase() == str2.toLowerCase();
};
/**
* 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.
* @see goog.string.isEmptyOrWhitespace
*/
goog.string.internal.isEmptyOrWhitespace = function(str) {
'use strict';
// testing length == 0 first is actually slower in all browsers (about the
// same in Opera).
// 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 /^[\s\xa0]*$/.test(str);
};
/**
* Trims white spaces to the left and right of a string.
* @param {string} str The string to trim.
* @return {string} A trimmed copy of `str`.
*/
goog.string.internal.trim =
(goog.TRUSTED_SITE && String.prototype.trim) ? function(str) {
'use strict';
return str.trim();
} : function(str) {
'use strict';
// Since IE doesn't include non-breaking-space (0xa0) in their \s
// character class (as required by section 7.2 of the ECMAScript spec),
// we explicitly include it in the regexp to enforce consistent
// cross-browser behavior.
// NOTE: We don't use String#replace because it might have side effects
// causing this function to not compile to 0 bytes.
return /^[\s\xa0]*([\s\S]*?)[\s\xa0]*$/.exec(str)[1];
};
/**
* 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.
* @see goog.string.caseInsensitiveCompare
*/
goog.string.internal.caseInsensitiveCompare = function(str1, str2) {
'use strict';
const test1 = String(str1).toLowerCase();
const test2 = String(str2).toLowerCase();
if (test1 < test2) {
return -1;
} else if (test1 == test2) {
return 0;
} else {
return 1;
}
};
/**
* 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.
* @see goog.string.newLineToBr
*/
goog.string.internal.newLineToBr = function(str, opt_xml) {
'use strict';
return str.replace(/(\r\n|\r|\n)/g, opt_xml ? '<br />' : '<br>');
};
/**
* 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.
* @param {string} str string to be escaped.
* @param {boolean=} opt_isLikelyToContainHtmlChars
* @return {string} An escaped copy of `str`.
* @see goog.string.htmlEscape
*/
goog.string.internal.htmlEscape = function(
str, opt_isLikelyToContainHtmlChars) {
'use strict';
if (opt_isLikelyToContainHtmlChars) {
str = str.replace(goog.string.internal.AMP_RE_, '&amp;')
.replace(goog.string.internal.LT_RE_, '&lt;')
.replace(goog.string.internal.GT_RE_, '&gt;')
.replace(goog.string.internal.QUOT_RE_, '&quot;')
.replace(goog.string.internal.SINGLE_QUOTE_RE_, '&#39;')
.replace(goog.string.internal.NULL_RE_, '&#0;');
return str;
} else {
// quick test helps in the case when there are no chars to replace, in
// worst case this makes barely a difference to the time taken
if (!goog.string.internal.ALL_RE_.test(str)) return str;
// str.indexOf is faster than regex.test in this case
if (str.indexOf('&') != -1) {
str = str.replace(goog.string.internal.AMP_RE_, '&amp;');
}
if (str.indexOf('<') != -1) {
str = str.replace(goog.string.internal.LT_RE_, '&lt;');
}
if (str.indexOf('>') != -1) {
str = str.replace(goog.string.internal.GT_RE_, '&gt;');
}
if (str.indexOf('"') != -1) {
str = str.replace(goog.string.internal.QUOT_RE_, '&quot;');
}
if (str.indexOf('\'') != -1) {
str = str.replace(goog.string.internal.SINGLE_QUOTE_RE_, '&#39;');
}
if (str.indexOf('\x00') != -1) {
str = str.replace(goog.string.internal.NULL_RE_, '&#0;');
}
return str;
}
};
/**
* Regular expression that matches an ampersand, for use in escaping.
* @const {!RegExp}
* @private
*/
goog.string.internal.AMP_RE_ = /&/g;
/**
* Regular expression that matches a less than sign, for use in escaping.
* @const {!RegExp}
* @private
*/
goog.string.internal.LT_RE_ = /</g;
/**
* Regular expression that matches a greater than sign, for use in escaping.
* @const {!RegExp}
* @private
*/
goog.string.internal.GT_RE_ = />/g;
/**
* Regular expression that matches a double quote, for use in escaping.
* @const {!RegExp}
* @private
*/
goog.string.internal.QUOT_RE_ = /"/g;
/**
* Regular expression that matches a single quote, for use in escaping.
* @const {!RegExp}
* @private
*/
goog.string.internal.SINGLE_QUOTE_RE_ = /'/g;
/**
* Regular expression that matches null character, for use in escaping.
* @const {!RegExp}
* @private
*/
goog.string.internal.NULL_RE_ = /\x00/g;
/**
* Regular expression that matches any character that needs to be escaped.
* @const {!RegExp}
* @private
*/
goog.string.internal.ALL_RE_ = /[\x00&<>"']/;
/**
* 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`.
* @see goog.string.whitespaceEscape
*/
goog.string.internal.whitespaceEscape = function(str, opt_xml) {
'use strict';
// This doesn't use goog.string.preserveSpaces for backwards compatibility.
return goog.string.internal.newLineToBr(
str.replace(/ /g, ' &#160;'), opt_xml);
};
/**
* 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`.
* @see goog.string.contains
*/
goog.string.internal.contains = function(str, subString) {
'use strict';
return str.indexOf(subString) != -1;
};
/**
* 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`.
* @see goog.string.caseInsensitiveContains
*/
goog.string.internal.caseInsensitiveContains = function(str, subString) {
'use strict';
return goog.string.internal.contains(
str.toLowerCase(), subString.toLowerCase());
};
/**
* 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.
* @see goog.string.compareVersions
*/
goog.string.internal.compareVersions = function(version1, version2) {
'use strict';
let order = 0;
// Trim leading and trailing whitespace and split the versions into
// subversions.
const v1Subs = goog.string.internal.trim(String(version1)).split('.');
const v2Subs = goog.string.internal.trim(String(version2)).split('.');
const subCount = Math.max(v1Subs.length, v2Subs.length);
// Iterate over the subversions, as long as they appear to be equivalent.
for (let subIdx = 0; order == 0 && subIdx < subCount; subIdx++) {
let v1Sub = v1Subs[subIdx] || '';
let v2Sub = v2Subs[subIdx] || '';
do {
// Split the subversions into pairs of numbers and qualifiers (like 'b').
// Two different RegExp objects are use to make it clear the code
// is side-effect free
const v1Comp = /(\d*)(\D*)(.*)/.exec(v1Sub) || ['', '', '', ''];
const v2Comp = /(\d*)(\D*)(.*)/.exec(v2Sub) || ['', '', '', ''];
// Break if there are no more matches.
if (v1Comp[0].length == 0 && v2Comp[0].length == 0) {
break;
}
// Parse the numeric part of the subversion. A missing number is
// equivalent to 0.
const v1CompNum = v1Comp[1].length == 0 ? 0 : parseInt(v1Comp[1], 10);
const v2CompNum = v2Comp[1].length == 0 ? 0 : parseInt(v2Comp[1], 10);
// Compare the subversion components. The number has the highest
// precedence. Next, if the numbers are equal, a subversion without any
// qualifier is always higher than a subversion with any qualifier. Next,
// the qualifiers are compared as strings.
order = goog.string.internal.compareElements_(v1CompNum, v2CompNum) ||
goog.string.internal.compareElements_(
v1Comp[2].length == 0, v2Comp[2].length == 0) ||
goog.string.internal.compareElements_(v1Comp[2], v2Comp[2]);
// Stop as soon as an inequality is discovered.
v1Sub = v1Comp[3];
v2Sub = v2Comp[3];
} while (order == 0);
}
return order;
};
/**
* Compares elements of a version number.
*
* @param {string|number|boolean} left An element from a version number.
* @param {string|number|boolean} right An element from a version number.
*
* @return {number} 1 if `left` is higher.
* 0 if arguments are equal.
* -1 if `right` is higher.
* @private
*/
goog.string.internal.compareElements_ = function(left, right) {
'use strict';
if (left < right) {
return -1;
} else if (left > right) {
return 1;
}
return 0;
};