# Mustache templates A Dart library to parse and render [mustache templates](https://mustache.github.io/). See the [mustache manual](http://mustache.github.com/mustache.5.html) for detailed usage information. This library passes all [mustache specification](https://github.com/mustache/spec/tree/master/specs) tests. ## Example usage ```dart import 'package:mustache/mustache.dart'; main() { var source = ''' {{# names }}

{{ lastname }}, {{ firstname }}

No names.

{{/ names }} {{! I am a comment. }} '''; var template = new Template(source, name: 'template-filename.html'); var output = template.renderString({'names': [ {'firstname': 'Greg', 'lastname': 'Lowe'}, {'firstname': 'Bob', 'lastname': 'Johnson'} ]}); print(output); } ``` A template is parsed when it is created, after parsing it can be rendered any number of times with different values. A TemplateException is thrown if there is a problem parsing or rendering the template. The Template contstructor allows passing a name, this name will be used in error messages. When working with a number of templates, it is important to pass a name so that the error messages specify which template caused the error. By default all output from `{{variable}}` tags is html escaped, this behaviour can be changed by passing htmlEscapeValues : false to the Template constructor. You can also use a `{{{triple mustache}}}` tag, or a unescaped variable tag `{{&unescaped}}`, the output from these tags is not escaped. ## Differences between strict mode and lenient mode. ### Strict mode (default) * Tag names may only contain the characters a-z, A-Z, 0-9, underscore, period and minus. Other characters in tags will cause a TemplateException to be thrown during parsing. * During rendering, if no map key or object member which matches the tag name is found, then a TemplateException will be thrown. ### Lenient mode * Tag names may use any characters. * During rendering, if no map key or object member which matches the tag name is found, then silently ignore and output nothing. ## Nested paths ```dart var t = new Template('{{ author.name }}'); var output = template.renderString({'author': {'name': 'Greg Lowe'}}); ``` ## Partials - example usage ```dart var partial = new Template('{{ foo }}', name: 'partial'); var resolver = (String name) { if (name == 'partial-name') { // Name of partial tag. return partial; } }; var t = new Template('{{> partial-name }}', partialResolver: resolver); var output = t.renderString({'foo': 'bar'}); // bar ``` ## Lambdas - example usage ```dart var t = new Template('{{# foo }}'); var lambda = (_) => 'bar'; t.renderString({'foo': lambda}); // bar ``` ```dart var t = new Template('{{# foo }}hidden{{/ foo }}'); var lambda = (_) => 'shown'}; t.renderString({'foo': lambda); // shown ``` ```dart var t = new Template('{{# foo }}oi{{/ foo }}'); var lambda = (LambdaContext ctx) => '${ctx.renderString().toUpperCase()}'; t.renderString({'foo': lambda}); // OI ``` ```dart var t = new Template('{{# foo }}{{bar}}{{/ foo }}'); var lambda = (LambdaContext ctx) => '${ctx.renderString().toUpperCase()}'; t.renderString({'foo': lambda, 'bar': 'pub'}); // PUB ``` ```dart var t = new Template('{{# foo }}{{bar}}{{/ foo }}'); var lambda = (LambdaContext ctx) => '${ctx.renderString().toUpperCase()}'; t.renderString({'foo': lambda, 'bar': 'pub'}); // PUB ``` In the following example `LambdaContext.renderSource(source)` re-parses the source string in the current context, this is the default behaviour in many mustache implementations. Since re-parsing the content is slow, and often not required, this library makes this step optional. ```dart var t = new Template('{{# foo }}{{bar}}{{/ foo }}'); var lambda = (LambdaContext ctx) => ctx.renderSource(ctx.source + ' {{cmd}}')}; t.renderString({'foo': lambda, 'bar': 'pub', 'cmd': 'build'}); // pub build ```

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