[FileSpec] Always normalize

Removing redundant components from the path seems pretty harmless.
Rather than checking whether this is necessary and then actually doing
so, always invoke remove_dots to start with a normalized path.

llvm-svn: 335432

lldb/source/Utility/FileSpec.cpp

@@ -119,100 +119,6 @@ FileSpec::FileSpec(const FileSpec *rhs) : m_directory(), m_filename() {
 //------------------------------------------------------------------
 FileSpec::~FileSpec() {}
 
-namespace {
-//------------------------------------------------------------------
-/// Safely get a character at the specified index.
-///
-/// @param[in] path
-///     A full, partial, or relative path to a file.
-///
-/// @param[in] i
-///     An index into path which may or may not be valid.
-///
-/// @return
-///   The character at index \a i if the index is valid, or 0 if
-///   the index is not valid.
-//------------------------------------------------------------------
-inline char safeCharAtIndex(const llvm::StringRef &path, size_t i) {
-  if (i < path.size())
-    return path[i];
-  return 0;
-}
-
-//------------------------------------------------------------------
-/// Check if a path needs to be normalized.
-///
-/// Check if a path needs to be normalized. We currently consider a
-/// path to need normalization if any of the following are true
-///  - path contains "/./"
-///  - path contains "/../"
-///  - path contains "//"
-///  - path ends with "/"
-/// Paths that start with "./" or with "../" are not considered to
-/// need normalization since we aren't trying to resolve the path,
-/// we are just trying to remove redundant things from the path.
-///
-/// @param[in] path
-///     A full, partial, or relative path to a file.
-///
-/// @return
-///   Returns \b true if the path needs to be normalized.
-//------------------------------------------------------------------
-bool needsNormalization(const llvm::StringRef &path) {
-  if (path.empty())
-    return false;
-  // We strip off leading "." values so these paths need to be normalized
-  if (path[0] == '.')
-    return true;
-  for (auto i = path.find_first_of("\\/"); i != llvm::StringRef::npos;
-       i = path.find_first_of("\\/", i + 1)) {
-    const auto next = safeCharAtIndex(path, i+1);
-    switch (next) {
-      case 0:
-        // path separator char at the end of the string which should be
-        // stripped unless it is the one and only character
-        return i > 0;
-      case '/':
-      case '\\':
-        // two path separator chars in the middle of a path needs to be
-        // normalized
-        if (i > 0)
-          return true;
-        ++i;
-        break;
-
-      case '.': {
-          const auto next_next = safeCharAtIndex(path, i+2);
-          switch (next_next) {
-            default: break;
-            case 0: return true; // ends with "/."
-            case '/':
-            case '\\':
-              return true; // contains "/./"
-            case '.': {
-              const auto next_next_next = safeCharAtIndex(path, i+3);
-              switch (next_next_next) {
-                default: break;
-                case 0: return true; // ends with "/.."
-                case '/':
-                case '\\':
-                  return true; // contains "/../"
-              }
-              break;
-            }
-          }
-        }
-        break;
-
-      default:
-        break;
-    }
-  }
-  return false;
-}
-
-
-}
 //------------------------------------------------------------------
 // Assignment operator.
 //------------------------------------------------------------------
@@ -252,7 +158,6 @@ void FileSpec::SetFile(llvm::StringRef pathname, bool resolve, Style style) {
   }
 
   // Normalize the path by removing ".", ".." and other redundant components.
-  if (needsNormalization(resolved))
   llvm::sys::path::remove_dots(resolved, true, m_style);
 
   // Normalize back slashes to forward slashes
@@ -270,10 +175,10 @@ void FileSpec::SetFile(llvm::StringRef pathname, bool resolve, Style style) {
   // Split path into filename and directory. We rely on the underlying char
   // pointer to be nullptr when the components are empty.
   llvm::StringRef filename = llvm::sys::path::filename(resolved, m_style);
-  if(!filename.empty())
+  if (!filename.empty())
     m_filename.SetString(filename);
   llvm::StringRef directory = llvm::sys::path::parent_path(resolved, m_style);
-  if(!directory.empty())
+  if (!directory.empty())
     m_directory.SetString(directory);
 }
 
@@ -424,9 +329,8 @@ bool FileSpec::Equal(const FileSpec &a, const FileSpec &b, bool full) {
   // case sensitivity of equality test
   const bool case_sensitive = a.IsCaseSensitive() || b.IsCaseSensitive();
 
-  const bool filenames_equal = ConstString::Equals(a.m_filename,
-                                                   b.m_filename,
-                                                   case_sensitive);
+  const bool filenames_equal =
+      ConstString::Equals(a.m_filename, b.m_filename, case_sensitive);
 
   if (!filenames_equal)
     return false;
@@ -712,9 +616,7 @@ bool FileSpec::IsSourceImplementationFile() const {
   return g_source_file_regex.Execute(extension.GetStringRef());
 }
 
-bool FileSpec::IsRelative() const {
-  return !IsAbsolute();
-}
+bool FileSpec::IsRelative() const { return !IsAbsolute(); }
 
 bool FileSpec::IsAbsolute() const {
   llvm::SmallString<64> current_path;