Add support for partials and path segments for Handlebars.

This introduces support for some missing features to the Handlebars lexer:
Partials and path segments. Partials mostly appeared to work before, but the
`>` in `{{> ... }}` would appear as a syntax error, as could other
components of the partial. This change introduces support for:

* Standard partials: `{{> partialName}}`
* Partials with parameters: `{{> partialName varname="value"}}`
* Ddynamic partials: `{{> (partialFunc)}}`
* Ddynamic partials with lookups: `{{> (lookup ../path "partialName")}}`
* Partial blocks: `{{> @partial-block}}`
* Inline partials: `{{#*inline}}..{{/inline}}`

It also introduces support for path segments, which can reference content in
the current context or in a parent context. For instance, `this.name`,
`this/name`, `./name`, `../name`, `this/name`, etc. These are all now tracked
as variables.

1 files changed, 22 insertions, 0 deletions

diff --git a/tests/string_asserts.py b/tests/string_asserts.py
new file mode 100644
index 00000000..11f5c7f0
--- /dev/null
+++ b/tests/string_asserts.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+"""
+    Pygments string assert utility
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    :copyright: Copyright 2006-2015 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+class StringTests(object):
+
+    def assertStartsWith(self, haystack, needle, msg=None):
+        if msg is None:
+            msg = "'{0}' does not start with '{1}'".format(haystack, needle)
+        if not haystack.startswith(needle):
+            raise(AssertionError(msg))
+
+    def assertEndsWith(self, haystack, needle, msg=None):
+        if msg is None:
+            msg = "'{0}' does not end with '{1}'".format(haystack, needle)
+        if not haystack.endswith(needle):
+            raise(AssertionError(msg))