Index: third_party/pkg/angular/lib/directive/ng_pluralize.dart |
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-part of angular.directive; |
- |
-/** |
- * ## Overview |
- * `ngPluralize` is a directive that displays messages according to locale rules. |
- * |
- * You configure ngPluralize directive by specifying the mappings between plural |
- * categories and the strings to be displayed. |
- * |
- * ## Plural categories and explicit number rules |
- * The available plural categories are: |
- * * "zero", |
- * * "one", |
- * * "two", |
- * * "few", |
- * * "many", |
- * * "other". |
- * |
- * While a plural category may match many numbers, an explicit number rule can |
- * only match one number. For example, the explicit number rule for "3" matches |
- * the number 3. There are examples of plural categories and explicit number |
- * rules throughout the rest of this documentation. |
- * |
- * ## Configuring ngPluralize |
- * You configure ngPluralize by providing 2 attributes: `count` and `when`. |
- * You can also provide an optional attribute, `offset`. |
- * |
- * The value of the `count` attribute can be either a string or an expression; |
- * these are evaluated on the current scope for its bound value. |
- * |
- * The `when` attribute specifies the mappings between plural categories and the |
- * actual string to be displayed. The value of the attribute should be a JSON |
- * object. |
- * |
- * The following example shows how to configure ngPluralize: |
- * |
- * <ng-pluralize count="personCount" |
- * when="{'0': 'Nobody is viewing.', |
- * 'one': '1 person is viewing.', |
- * 'other': '{} people are viewing.'}"> |
- * </ng-pluralize> |
- * |
- * In the example, `"0: Nobody is viewing."` is an explicit number rule. If you |
- * did not specify this rule, 0 would be matched to the "other" category and |
- * "0 people are viewing" would be shown instead of "Nobody is viewing". You can |
- * specify an explicit number rule for other numbers, for example 12, so that |
- * instead of showing "12 people are viewing", you can show "a dozen people are |
- * viewing". |
- * |
- * You can use a set of closed braces (`{}`) as a placeholder for the number |
- * that you want substituted into pluralized strings. In the previous example, |
- * Angular will replace `{}` with `{{personCount}}`. The closed braces `{}` is a |
- * placeholder {{numberExpression}}. |
- * |
- * ## Configuring ngPluralize with offset |
- * The `offset` attribute allows further customization of pluralized text, which |
- * can result in a better user experience. For example, instead of the message |
- * "4 people are viewing this document", you might display "John, Kate and 2 |
- * others are viewing this document". The offset attribute allows you to offset |
- * a number by any desired value. |
- * |
- * Let's take a look at an example: |
- * |
- * <ng-pluralize count="personCount" offset=2 |
- * when="{'0': 'Nobody is viewing.', |
- * '1': '${person1} is viewing.', |
- * '2': '${person1} and ${person2} are viewing.', |
- * 'one': '${person1}, ${person2} and one other person are viewing.', |
- * 'other': '${person1}, ${person2} and {} other people are viewing.'}"> |
- * </ng-pluralize> |
- * |
- * Notice that we are still using two plural categories(one, other), but we added |
- * three explicit number rules 0, 1 and 2. |
- * When one person, perhaps John, views the document, "John is viewing" will be |
- * shown. When three people view the document, no explicit number rule is found, |
- * so an offset of 2 is taken off 3, and Angular uses 1 to decide the plural |
- * category. In this case, plural category 'one' is matched and "John, Marry and |
- * one other person are viewing" is shown. |
- * |
- * Note that when you specify offsets, you must provide explicit number rules |
- * for numbers from 0 up to and including the offset. If you use an offset of 3, |
- * for example, you must provide explicit number rules for 0, 1, 2 and 3. You |
- * must also provide plural strings for at least the "other" plural category. |
- */ |
-@NgDirective( |
- selector: 'ng-pluralize', |
- map: const { 'count': '=>count' }) |
-@NgDirective( |
- selector: '[ng-pluralize]', |
- map: const { 'count': '=>count' }) |
-class NgPluralizeDirective { |
- final dom.Element element; |
- final Scope scope; |
- final Interpolate interpolate; |
- final AstParser parser; |
- int offset; |
- var discreteRules = <String, String>{}; |
- var categoryRules = <Symbol, String>{}; |
- |
- static final RegExp IS_WHEN = new RegExp(r'^when-(minus-)?.'); |
- static const Map<String, Symbol> SYMBOLS = const { |
- 'zero' : #zero, |
- 'one' : #one, |
- 'two' : #two, |
- 'few' : #few, |
- 'many' : #many, |
- 'other' : #other, |
- }; |
- |
- NgPluralizeDirective(this.scope, this.element, this.interpolate, |
- NodeAttrs attributes, this.parser) { |
- Map<String, String> whens = attributes['when'] == null |
- ? {} |
- : scope.eval(attributes['when']); |
- offset = attributes['offset'] == null ? 0 : int.parse(attributes['offset']); |
- |
- element.attributes.keys.where((k) => IS_WHEN.hasMatch(k)).forEach((k) { |
- var ruleName = k.replaceFirst('when-', '').replaceFirst('minus-', '-'); |
- whens[ruleName] = element.attributes[k]; |
- }); |
- |
- if (whens['other'] == null) { |
- throw "ngPluralize error! The 'other' plural category must always be " |
- "specified"; |
- } |
- |
- whens.forEach((k, v) { |
- Symbol symbol = SYMBOLS[k]; |
- if (symbol != null) { |
- this.categoryRules[symbol] = v; |
- } else { |
- this.discreteRules[k] = v; |
- } |
- }); |
- } |
- |
- set count(value) { |
- if (value is! num) { |
- try { |
- value = int.parse(value); |
- } catch(e) { |
- try { |
- value = double.parse(value); |
- } catch(e) { |
- element.text = ''; |
- return; |
- } |
- } |
- } |
- |
- String stringValue = value.toString(); |
- int intValue = value.toInt(); |
- |
- if (discreteRules[stringValue] != null) { |
- _setAndWatch(discreteRules[stringValue]); |
- } else { |
- intValue -= offset; |
- var exp = Function.apply(Intl.plural, [intValue], categoryRules); |
- if (exp != null) { |
- exp = exp.replaceAll(r'{}', (value - offset).toString()); |
- _setAndWatch(exp); |
- } |
- } |
- } |
- |
- _setAndWatch(expression) { |
- var interpolation = interpolate(expression, false, '\${', '}'); |
- interpolation.setter = (text) => element.text = text; |
- interpolation.setter(expression); |
- var items = interpolation.expressions.map((exp) => parser(exp)).toList(); |
- AST ast = new PureFunctionAST(expression, new ArrayFn(), items); |
- scope.watch(ast, interpolation.call); |
- } |
-} |