From a3cb4c5d02f0ee75094fc27814c71f8a025d034b Mon Sep 17 00:00:00 2001
From: sbrandt <sbrandt@17b73243-c579-4c4c-a9d2-2d5706c11dac>
Date: Wed, 3 Apr 2013 19:12:46 +0000
Subject: Add the basic grammar files, and the changes to the piraha code
 necessary to parse all of Cactus.

git-svn-id: http://svn.cactuscode.org/flesh/trunk@4990 17b73243-c579-4c4c-a9d2-2d5706c11dac
---
 src/piraha/Boundary.cc | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 src/piraha/Boundary.cc

(limited to 'src/piraha/Boundary.cc')

diff --git a/src/piraha/Boundary.cc b/src/piraha/Boundary.cc
new file mode 100644
index 00000000..6c34335b
--- /dev/null
+++ b/src/piraha/Boundary.cc
@@ -0,0 +1,20 @@
+#include "Piraha.hpp"
+
+using namespace piraha;
+
+bool is_c_ident(char c) {
+    return ('a' <= c && c <= 'z')
+        || ('A' <= c && c <= 'Z')
+        || ('0' <= c && c <= '9')
+        || c == '_';
+}
+
+bool Boundary::match(Matcher *m) {
+    if(m->pos == 0 || m->pos == (int)m->input_size)
+        return true;
+    char c2 =  m->input[m->pos];
+    char c1 =  m->input[m->pos-1];
+    bool b1 = is_c_ident(c1);
+    bool b2 = is_c_ident(c2);
+    return !b1 || !b2;
+}
-- 
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