* Combines the values of consecutive text tokens in the given `tokens` array * to a single token.

* Represents a rendering context by wrapping a view object and * maintaining a reference to the parent context.

* A simple string scanner that is used by the template parser to find * tokens in template strings.

* A Writer knows how to take a stream of tokens and render them to a * string, given a context. It also maintains a cache of templates to * avoi