Example #1
0
/**
 * Repeats the given string `n` times.
 *
 * @static
 * @memberOf _
 * @category String
 * @param {string} [string=''] The string to repeat.
 * @param {number} [n=0] The number of times to repeat the string.
 * @returns {string} Returns the repeated string.
 * @example
 *
 * _.repeat('*', 3);
 * // => '***'
 *
 * _.repeat('abc', 2);
 * // => 'abcabc'
 *
 * _.repeat('abc', 0);
 * // => ''
 */
function repeat(string, n) {
  var result = '';
  string = baseToString(string);
  n = +n;
  if (n < 1 || !string || !nativeIsFinite(n)) {
    return result;
  }
  // Leverage the exponentiation by squaring algorithm for a faster repeat.
  // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
  do {
    if (n % 2) {
      result += string;
    }
    n = floor(n / 2);
    string += string;
  } while (n);

  return result;
}
Example #2
0
/**
 * Pads `string` on the right side if it is shorter then the given padding
 * length. The `chars` string may be truncated if the number of padding
 * characters exceeds the padding length.
 *
 * @static
 * @memberOf _
 * @category String
 * @param {string} [string=''] The string to pad.
 * @param {number} [length=0] The padding length.
 * @param {string} [chars=' '] The string used as padding.
 * @returns {string} Returns the padded string.
 * @example
 *
 * _.padRight('abc', 6);
 * // => 'abc   '
 *
 * _.padRight('abc', 6, '_-');
 * // => 'abc_-_'
 *
 * _.padRight('abc', 3);
 * // => 'abc'
 */
function padRight(string, length, chars) {
  string = baseToString(string);
  return string && (string + createPad(string, length, chars));
}
Example #3
0
/**
 * Converts `value` to a string. An empty string is returned for `null`
 * and `undefined` values. The sign of `-0` is preserved.
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to process.
 * @returns {string} Returns the string.
 * @example
 *
 * _.toString(null);
 * // => ''
 *
 * _.toString(-0);
 * // => '-0'
 *
 * _.toString([1, 2, 3]);
 * // => '1,2,3'
 */
function toString(value) {
    return value == null ? '' : baseToString(value);
}
Example #4
0
/**
 * Pads `string` on the left side if it is shorter then the given padding
 * length. The `chars` string may be truncated if the number of padding
 * characters exceeds the padding length.
 *
 * @static
 * @memberOf _
 * @category String
 * @param {string} [string=''] The string to pad.
 * @param {number} [length=0] The padding length.
 * @param {string} [chars=' '] The string used as padding.
 * @returns {string} Returns the padded string.
 * @example
 *
 * _.padLeft('abc', 6);
 * // => '   abc'
 *
 * _.padLeft('abc', 6, '_-');
 * // => '_-_abc'
 *
 * _.padLeft('abc', 3);
 * // => 'abc'
 */
function padLeft(string, length, chars) {
  string = baseToString(string);
  return string && (createPad(string, length, chars) + string);
}
 return function(string, length, chars) {
   string = baseToString(string);
   return (fromRight ? string : '') + createPadding(string, length, chars) + (fromRight ? '' : string);
 };
Example #6
0
/**
 * Creates a compiled template function that can interpolate data properties
 * in "interpolate" delimiters, HTML-escape interpolated data properties in
 * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
 * properties may be accessed as free variables in the template. If a setting
 * object is provided it takes precedence over `_.templateSettings` values.
 *
 * **Note:** In the development build `_.template` utilizes sourceURLs for easier debugging.
 * See the [HTML5 Rocks article on sourcemaps](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
 * for more details.
 *
 * For more information on precompiling templates see
 * [lodash's custom builds documentation](https://lodash.com/custom-builds).
 *
 * For more information on Chrome extension sandboxes see
 * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
 *
 * @static
 * @memberOf _
 * @category String
 * @param {string} [string=''] The template string.
 * @param {Object} [options] The options object.
 * @param {RegExp} [options.escape] The HTML "escape" delimiter.
 * @param {RegExp} [options.evaluate] The "evaluate" delimiter.
 * @param {Object} [options.imports] An object to import into the template as free variables.
 * @param {RegExp} [options.interpolate] The "interpolate" delimiter.
 * @param {string} [options.sourceURL] The sourceURL of the template's compiled source.
 * @param {string} [options.variable] The data object variable name.
 * @param- {Object} [otherOptions] Enables the legacy `options` param signature.
 * @returns {Function} Returns the compiled template function.
 * @example
 *
 * // using the "interpolate" delimiter to create a compiled template
 * var compiled = _.template('hello <%= user %>!');
 * compiled({ 'user': 'fred' });
 * // => 'hello fred!'
 *
 * // using the HTML "escape" delimiter to escape data property values
 * var compiled = _.template('<b><%- value %></b>');
 * compiled({ 'value': '<script>' });
 * // => '<b>&lt;script&gt;</b>'
 *
 * // using the "evaluate" delimiter to execute JavaScript and generate HTML
 * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
 * compiled({ 'users': ['fred', 'barney'] });
 * // => '<li>fred</li><li>barney</li>'
 *
 * // using the internal `print` function in "evaluate" delimiters
 * var compiled = _.template('<% print("hello " + user); %>!');
 * compiled({ 'user': 'barney' });
 * // => 'hello barney!'
 *
 * // using the ES delimiter as an alternative to the default "interpolate" delimiter
 * var compiled = _.template('hello ${ user }!');
 * compiled({ 'user': 'pebbles' });
 * // => 'hello pebbles!'
 *
 * // using custom template delimiters
 * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
 * var compiled = _.template('hello {{ user }}!');
 * compiled({ 'user': 'mustache' });
 * // => 'hello mustache!'
 *
 * // using backslashes to treat delimiters as plain text
 * var compiled = _.template('<%= "\\<%- value %\\>" %>');
 * compiled({ 'value': 'ignored' });
 * // => '<%- value %>'
 *
 * // using the `imports` option to import `jQuery` as `jq`
 * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
 * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
 * compiled({ 'users': ['fred', 'barney'] });
 * // => '<li>fred</li><li>barney</li>'
 *
 * // using the `sourceURL` option to specify a custom sourceURL for the template
 * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
 * compiled(data);
 * // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector
 *
 * // using the `variable` option to ensure a with-statement isn't used in the compiled template
 * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
 * compiled.source;
 * // => function(data) {
 *   var __t, __p = '';
 *   __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
 *   return __p;
 * }
 *
 * // using the `source` property to inline compiled templates for meaningful
 * // line numbers in error messages and a stack trace
 * fs.writeFileSync(path.join(cwd, 'jst.js'), '\
 *   var JST = {\
 *     "main": ' + _.template(mainText).source + '\
 *   };\
 * ');
 */
function template(string, options, otherOptions) {
  // Based on John Resig's `tmpl` implementation (http://ejohn.org/blog/javascript-micro-templating/)
  // and Laura Doktorova's doT.js (https://github.com/olado/doT).
  var settings = templateSettings.imports._.templateSettings || templateSettings;

  if (otherOptions && isIterateeCall(string, options, otherOptions)) {
    options = otherOptions = null;
  }
  string = baseToString(string);
  options = baseAssign(baseAssign({}, otherOptions || options), settings, assignOwnDefaults);

  var imports = baseAssign(baseAssign({}, options.imports), settings.imports, assignOwnDefaults),
      importsKeys = keys(imports),
      importsValues = baseValues(imports, importsKeys);

  var isEscaping,
      isEvaluating,
      index = 0,
      interpolate = options.interpolate || reNoMatch,
      source = "__p += '";

  // Compile the regexp to match each delimiter.
  var reDelimiters = RegExp(
    (options.escape || reNoMatch).source + '|' +
    interpolate.source + '|' +
    (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
    (options.evaluate || reNoMatch).source + '|$'
  , 'g');

  // Use a sourceURL for easier debugging.
  var sourceURL = 'sourceURL' in options ? '//# sourceURL=' + options.sourceURL + '\n' : '';

  string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
    interpolateValue || (interpolateValue = esTemplateValue);

    // Escape characters that can't be included in string literals.
    source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);

    // Replace delimiters with snippets.
    if (escapeValue) {
      isEscaping = true;
      source += "' +\n__e(" + escapeValue + ") +\n'";
    }
    if (evaluateValue) {
      isEvaluating = true;
      source += "';\n" + evaluateValue + ";\n__p += '";
    }
    if (interpolateValue) {
      source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
    }
    index = offset + match.length;

    // The JS engine embedded in Adobe products requires returning the `match`
    // string in order to produce the correct `offset` value.
    return match;
  });

  source += "';\n";

  // If `variable` is not specified wrap a with-statement around the generated
  // code to add the data object to the top of the scope chain.
  var variable = options.variable;
  if (!variable) {
    source = 'with (obj) {\n' + source + '\n}\n';
  }
  // Cleanup code by stripping empty strings.
  source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
    .replace(reEmptyStringMiddle, '$1')
    .replace(reEmptyStringTrailing, '$1;');

  // Frame code as the function body.
  source = 'function(' + (variable || 'obj') + ') {\n' +
    (variable
      ? ''
      : 'obj || (obj = {});\n'
    ) +
    "var __t, __p = ''" +
    (isEscaping
       ? ', __e = _.escape'
       : ''
    ) +
    (isEvaluating
      ? ', __j = Array.prototype.join;\n' +
        "function print() { __p += __j.call(arguments, '') }\n"
      : ';\n'
    ) +
    source +
    'return __p\n}';

  var result = attempt(function() {
    return Function(importsKeys, sourceURL + 'return ' + source).apply(undefined, importsValues);
  });

  // Provide the compiled function's source by its `toString` method or
  // the `source` property as a convenience for inlining compiled templates.
  result.source = source;
  if (isError(result)) {
    throw result;
  }
  return result;
}
/**
 * Generates a unique ID. If `prefix` is provided the ID is appended to it.
 *
 * @static
 * @memberOf _
 * @category Utility
 * @param {string} [prefix] The value to prefix the ID with.
 * @returns {string} Returns the unique ID.
 * @example
 *
 * _.uniqueId('contact_');
 * // => 'contact_104'
 *
 * _.uniqueId();
 * // => '105'
 */
function uniqueId(prefix) {
  var id = ++idCounter;
  return baseToString(prefix) + id;
}