First version of a class to represent the notion of an operating system

path to a file or directory and some rudimentary operations on them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15762 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/System/Path.h b/include/llvm/System/Path.h
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+//===- Path.h - Implement the Path class ------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// Copyright (C) 2003 eXtensible Systems, Inc. All Rights Reserved.
+//
+// This program is open source software; you can redistribute it and/or modify
+// it under the terms of the University of Illinois Open Source License. See
+// LICENSE.TXT (distributed with this software) for details.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+// or FITNESS FOR A PARTICULAR PURPOSE.  
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the llvm::sys::Path class. The Path class provides the
+// operating system agnostic concept of the name of a file or directory.
+//
+//===----------------------------------------------------------------------===//
+/// @file lib/System/Path.h
+/// @author Reid Spencer <raspencer@x10sys.com> (original author)
+/// @version \verbatim $Id$ \endverbatim
+/// @date 2004/08/14
+/// @since 1.4
+/// @brief Declares the llvm::sys::Path class.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_PATH_H
+#define LLVM_SYSTEM_PATH_H
+
+#include "llvm/System/ErrorCode.h"
+
+namespace llvm {
+namespace sys {
+
+  /// This class provides an abstraction for the name of a path
+  /// to a file or directory in the filesystem.
+  /// @since 1.4
+  /// @brief An abstraction for operating system paths.
+  class Path : public std::string 
+  {
+  /// @name Types
+  /// @{
+  public:
+    /// @brief An enumerator for specifying special ways to construct
+    /// the path.
+    enum ConstructSpecial {
+      CONSTRUCT_TEMP_FILE = 1, ///< make a temporary file name
+      CONSTRUCT_TEMP_DIR = 2,  ///< Make a temporary directory name
+    };
+
+  /// @}
+  /// @name Constructors
+  /// @{
+  public:
+    /// Forward declare this because constructors need to use it.
+    /// @returns true if the path is valid
+    /// @brief Determines if the path is valid (properly formed) or not.
+    inline bool is_valid() const throw();
+
+    /// Creates a null (empty) path
+    /// @brief Default Constructor
+    Path () throw() {}
+
+    /// Creates a path from char*
+    /// @brief char* converter
+    Path ( const char * name ) throw() : std::string(name) {
+      assert(is_valid());
+    }
+
+    /// @brief std::string converter
+    Path ( const std::string& name ) throw() : std::string(name) {
+      assert(is_valid());
+    }
+
+    /// Copies the path with copy-on-write semantics. The \p this Path
+    /// will reference \p the that Path until one of them is modified
+    /// at which point a full copy is taken before the write.
+    /// @brief Copy Constructor
+    Path ( const Path & that ) throw() : std::string(that) {
+      assert(is_valid());
+    }
+
+    /// This constructor will construct the path using a special 
+    /// construction argument that will pre-fill the path with the name
+    /// of some special path name
+    /// @brief Construct a special, well known path
+    Path( ConstructSpecial ) throw();
+
+    /// Releases storage associated with the Path object
+    /// @brief Destructor
+    ~Path () throw() {}
+
+  /// @}
+  /// @name Operators
+  /// @{
+  public:
+    /// Makes a copy of \p that to \p this with copy-on-write semantics.
+    /// @returns \p this
+    /// @brief Assignment Operator
+    Path & operator = ( const Path & that ) throw() {
+      this->assign ( that );
+      return *this;
+    }
+
+    /// Comparies \p this Path with \p that Path for equality.
+    /// @returns true if \p this and \p that refer to the same item.
+    /// @brief Equality Operator
+    bool operator ==( const Path & that ) const throw() {
+      return 0 == this->compare( that ) ;
+    }
+
+    /// Comparies \p this Path with \p that Path for inequality.
+    /// @returns true if \p this and \p that refer to different items.
+    /// @brief Inequality Operator
+    bool operator !=( const Path & that ) const throw() {
+      return 0 != this->compare( that );
+    }
+
+  /// @}
+  /// @name Accessors
+  /// @{
+  public:
+    /// @returns true if the path could reference a file
+    /// @brief Determines if the path is valid for a file reference.
+    bool is_file() const throw();
+
+    /// @returns true if the path could reference a directory
+    /// @brief Determines if the path is valid for a directory reference.
+    bool is_directory() const throw();
+
+    /// @brief Fills and zero terminates a buffer with the path
+    inline void fill( char* buffer, uint32_t len ) const throw();
+
+  /// @}
+  /// @name Mutators
+  /// @{
+  public:
+    /// This ensures that the pathname is terminated with a /
+    /// @brief Make the path reference a directory.
+    ErrorCode make_directory() throw();
+
+    /// This ensures that the pathname is not terminated with a /
+    /// @brief Makes the path reference a file.
+    ErrorCode make_file() throw();
+
+    /// the file system.
+    /// @returns true if the pathname references an existing file.
+    /// @brief Determines if the path is a file or directory in
+    ErrorCode exists()  throw();
+
+    /// The \p dirname is added to the end of the Path.
+    /// @param dirname A string providing the directory name to
+    /// be appended to the path.
+    /// @brief Appends the name of a directory.
+    ErrorCode append_directory( const std::string & dirname ) throw();
+
+    /// The \p filename is added to the end of the Path.
+    /// @brief Appends the name of a file.
+    ErrorCode append_file( const std::string& filename ) throw();
+
+    /// Directories will have no entries. Files will be zero length. If
+    /// the file or directory already exists, no error results.
+    /// @throws SystemException if any error occurs.
+    /// @brief Causes the file or directory to exist in the filesystem.
+    ErrorCode create( bool create_parents = false ) throw();
+
+    ErrorCode create_directory() throw();
+    ErrorCode create_directories() throw() ;
+    ErrorCode create_file() throw() ;
+
+    /// Directories must be empty before they can be removed. If not,
+    /// an error will result. Files will be unlinked, even if another
+    /// process is using them.
+    /// @brief Removes the file or directory from the filesystem.
+    ErrorCode remove() throw();
+    ErrorCode remove_directory() throw() ;
+    ErrorCode remove_file() throw() ; 
+
+    /// Temporary file names are a common need. This method uses the
+    /// template in the existing path and uniquifies a file name based
+    /// on the template.
+    ErrorCode make_temp_file() throw();
+
+    /// Temporary directory names are a common need. This method uses
+    /// the template in the existing path and uniqufies a directory
+    /// name based on the template.
+    ErrorCode make_temp_directory() throw();
+
+    /// Find library.
+    ErrorCode find_lib( const char * file ) throw();
+  /// @}
+
+  };
+
+  inline bool Path::is_valid() const throw() {
+    if ( empty() ) return false;
+    return true;
+  }
+
+  inline void Path::fill( char* buffer, size_t bufflen ) const throw() {
+    size_t pathlen = length();
+    assert( bufflen > pathlen );
+    size_t copylen = pathlen <? (bufflen - 1);
+    this->copy(buffer, copylen, 0 );
+    buffer[ copylen ] = 0;
+  }
+}
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab
+
+#endif