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, 53 insertions, 0 deletions

diff --git a/tests/examplefiles/example.bc b/tests/examplefiles/example.bc
new file mode 100644
index 00000000..6604cd31
--- /dev/null
+++ b/tests/examplefiles/example.bc
@@ -0,0 +1,53 @@
+/*
+ * Calculate the Greatest Common Divisor of a and b.
+ */
+define gcd(a, b) {
+    auto tmp;
+
+    /*
+     * Euclidean algorithm
+     */
+    while (b != 0) {
+        tmp = a % b;
+        a = b;
+        b = tmp;
+    }
+    return a;
+}
+"gcd(225, 150) = " ; gcd(225, 150)
+
+/* assign operators */
+a = 10
+a += 1
+a++
+++a
+a--
+--a
+a += 5
+a -= 5
+a *= 2
+a /= 3
+a ^= 2
+a %= 2
+
+/* comparison */
+if (a > 2) {
+}
+if (a >= 2) {
+}
+if (a == 2) {
+}
+if (a != 2) {
+}
+if (a <= 2) {
+}
+if (a < 2) {
+}
+
+a /* /*/ * 2        /* == a * 2       */
+a //* /*/ 1.5       /* == a / 1.5     */
+a /*/*/ * 3         /* == a * 3       */
+a * 3 /**/ * 4      /* == a * 3 * 4   */
+a / 3 //*//*/ .4    /* == a / 3 / 0.4 */
+a / 3 //*//*/ 1.3   /* == a / 3 / 1.4 */
+a / 3 /*//*// 1.3   /* == a / 3 / 1.4 */