From 378e2971c2f78a9b79453bd47d2ddc658017a44d Mon Sep 17 00:00:00 2001
From: David Kerkeslager <kerkeslager@gmail.com>
Date: Mon, 19 Aug 2019 22:28:18 -0400
Subject: [PATCH] Add Rope_length (mostly as a way to add __attribute__((pure))
 to the codebase

---
 c/rope.c | 9 +++++++++
 c/rope.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/c/rope.c b/c/rope.c
index 716a5af..2cab922 100644
--- a/c/rope.c
+++ b/c/rope.c
@@ -87,4 +87,13 @@ Rope* Rope_concatenate(Rope* r0, Rope* r1) {
   return result;
 }
 
+__attribute__((pure)) size_t Rope_length(Rope* self) {
+  switch(self->type) {
+    case ROPETYPE_CONCATENATION:
+      return Rope_length(self->instance.concatenation.r0) + Rope_length(self->instance.concatenation.r0);
+    case ROPETYPE_STRING:
+      return self->instance.string.length;
+  }
+}
+
 #endif
diff --git a/c/rope.h b/c/rope.h
index 33319e7..650596d 100644
--- a/c/rope.h
+++ b/c/rope.h
@@ -21,4 +21,6 @@ Rope* Rope_read(Encoding, FILE);
 
 Rope* Rope_concatenate(Rope* r0, Rope* r1);
 
+size_t Rope_length(Rope*) __attribute__((pure));
+
 #endif
-- 
2.20.1