Docserver: Update to the latest version of handlebar. Lots of re-syntaxifying.

third_party/handlebar/README.md

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-# Handlebar templates
-
-This repository contains utilities around a templating system that I called "Handlebar". They're a logic-less templating language based on [mustache](http://mustache.github.com/) (obviously) which is itself based on [ctemplate](http://code.google.com/p/ctemplate) apparently.
-
-The original and reference implementation is written in Java, with a JavaScript (via CoffeeScript) port and a Python port. The tests are cross-platform but controlled from Java with junit; this means that all implementations are hopefully up to date (or else some tests are failing).
-
-The goal of handlebar is to provide the most complete and convenient way to write logic-less templates across the whole stack of a web application. Write templates once, statically render content on the Java/Python server, then as content is dynamically added render it using the same templates on the JavaScript client.
-
-## Overview
-
-A template is text plus "mustache" control characters (thank you mustache for the cool terminology I have adopted).
-
-A template is rendered by passing it JSON data. I say "JSON" but what I really mean is JSON-like data; the actual input will vary depending on the language bindings (Java uses reflection over properties and maps, JavaScript uses objects, Python uses dictionaries).
-
-Generally speaking there are two classes of mustaches: "self closing" ones like `{{foo}}` `{{{foo}}}` `{{*foo}}`, and "has children" ones like `{{#foo}}...{{/foo}}` `{{?foo}}...{{/foo}}` `{{^foo}}...{{/foo}}` where the `...` is arbitrary other template data.
-
-In both cases the `foo` represents a path into the JSON structure, so
-
-    {{foo.bar.baz}}
-
-is valid for JSON like
-
-    {"foo": {"bar": {"baz": 42 }}}
-
-(here it would resolve to `42`).
-
-All libraries also have the behaviour where descending into a section of the JSON will "push" the sub-JSON onto the top of the "context stack", so given JSON like
-
-    {"foo": {"bar": {"foo": 42 }}}
-
-the template
-
-    {{foo.bar.foo}} {{?foo}}{{bar.foo}} {{?bar}{{foo}}{{/bar}} {{/foo}}
-
-will correctly resolve all references to be `42`.
-
-There is an additional identifier `@` representing the "tip" of that context stack, useful when iterating using the `{{#foo}}...{{/foo}}` structure; `{ "list": [1,2,3] }` with `{{#list}} {{@}} {{/list}}` will print ` 1  2  3 `.
-
-Finally, note that the `{{/foo}}` in `{{#foo}}...{{/foo}}` is actually redundant, and that `{{#foo}}...{{/}}` would be sufficient. Depdencing on the situation one or the other will tend to be more readable (explicitly using `{{/foo}}` will perform more validation).
-
-## Structures ("mustaches")
-
-### `{{foo.bar}}`
-
-Prints out the HTML-escaped value at path `foo.bar`.
-
-### `{{{foo.bar}}}`
-
-Prints out value at path `foo.bar` (no escaping).
-
-### `{{*foo.bar}}}`
-
-Prints out the JSON serialization of the object at path `foo.bar` (no escaping; this is designed for JavaScript client bootstrapping).
-
-### `{{+foo.bar}}`
-
-Inserts the sub-template (aka "partial template") found at path `foo.bar`. Currently, all libraries actually enforce that this is a pre-compiled template (rather than a plain string for example) for efficiency. This lets you do something like:
-
-    template = Handlebar('{{#list}} {{+partial}} {{/}}')
-    partial = Handlebar('{{foo}}...')
-    json = {
-      'list': [
-        { 'foo': 42 },
-        { 'foo': 56 },
-        { 'foo': 10 }
-      ]
-    }
-    print(template.render(json, {'partial': partial}).text)
-    >  42...  56...  10...
-
-Very useful for dynamic web apps, and also just very useful.
-
-### `{{#foo.bar}}...{{/}}`
-
-Runs `...` for each item in an array found at path `foo.bar`, or each key/value pair in an object.
-
-### `{{?foo.bar}}...{{/}}`
-
-Runs `...` if `foo.bar` resolves to a "value", which is defined based on types.
-
-* `null` is never considered a value.
-* `true` is a valid, `false` isn't.
-* Any number other than `0` is a value.
-* Any non-empty string is a value.
-* Any non-empty array is a value.
-* Any non-empty object is a value.
-
-### `{{^foo.bar}}...{{/}}`
-
-Runs `...` if `foo.bar` _doesn't_ resolve to a "value". The exact opposite of `{{?foo.bar}}...{{/}}`.
-
-### `{{:foo.bar}}{{=case1}}...{{=case2}}___{{/}}`
-
-Ooh a switch statement! Prints `...` if the string found at `foo.bar` is the string `"case1"`, `___` if it's `"case2"`, etc.
-
-## That's all
-
-But at the moment this is currently under heavy weekend development. Which is to say a constant trickle of code as I need it.
-
-Soon: better fault tolerance all round, comments, tidier syntax, less whitespacey output, and moving the Java and JavaScript/CoffeeScript implementations and tests into this repository! And maybe some kind of online playground at some point.