From 4c84d5f5469ec469732a5656e3b601bd54c2d2a7 Mon Sep 17 00:00:00 2001
From: Gil <mcg@google.com>
Date: Tue, 5 Jun 2018 14:31:36 -0700
Subject: Add pathname manipulation utilities (#1376)

---
 Firestore/core/src/firebase/firestore/util/path.cc | 84 ++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 Firestore/core/src/firebase/firestore/util/path.cc

(limited to 'Firestore/core/src/firebase/firestore/util/path.cc')

diff --git a/Firestore/core/src/firebase/firestore/util/path.cc b/Firestore/core/src/firebase/firestore/util/path.cc
new file mode 100644
index 0000000..940f12a
--- /dev/null
+++ b/Firestore/core/src/firebase/firestore/util/path.cc
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Firestore/core/src/firebase/firestore/util/path.h"
+
+namespace firebase {
+namespace firestore {
+namespace util {
+
+absl::string_view Path::Basename(absl::string_view pathname) {
+  size_t slash = pathname.find_last_of('/');
+
+  if (slash == absl::string_view::npos) {
+    // No path separator found => the whole string.
+    return pathname;
+  }
+
+  // Otherwise everything after the slash is the basename (even if empty string)
+  return pathname.substr(slash + 1);
+}
+
+absl::string_view Path::Dirname(absl::string_view pathname) {
+  size_t last_slash = pathname.find_last_of('/');
+
+  if (last_slash == absl::string_view::npos) {
+    // No path separator found => empty string. Conformance with POSIX would
+    // have us return "." here.
+    return pathname.substr(0, 0);
+  }
+
+  // Collapse runs of slashes.
+  size_t nonslash = pathname.find_last_not_of('/', last_slash);
+  if (nonslash == absl::string_view::npos) {
+    // All characters preceding the last path separator are slashes
+    return pathname.substr(0, 1);
+  }
+
+  last_slash = nonslash + 1;
+
+  // Otherwise everything up to the slash is the parent directory
+  return pathname.substr(0, last_slash);
+}
+
+bool Path::IsAbsolute(absl::string_view path) {
+#if defined(_WIN32)
+#error "Handle drive letters"
+
+#else
+  return !path.empty() && path.front() == '/';
+#endif
+}
+
+void Path::JoinAppend(std::string* base, absl::string_view path) {
+  if (IsAbsolute(path)) {
+    base->assign(path.data(), path.size());
+
+  } else {
+    size_t nonslash = base->find_last_not_of('/');
+    if (nonslash != std::string::npos) {
+      base->resize(nonslash + 1);
+      base->push_back('/');
+    }
+
+    // If path started with a slash we'd treat it as absolute above
+    base->append(path.data(), path.size());
+  }
+}
+
+}  // namespace util
+}  // namespace firestore
+}  // namespace firebase
-- 
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