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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186636 91177308-0d34-0410-b5e6-96231b3b80d8
383 lines
11 KiB
C++
383 lines
11 KiB
C++
//===- llvm/Support/Path.h - Path Operating System Concept ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the llvm::sys::path namespace. It is designed after
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// TR2/boost filesystem (v3), but modified to remove exception handling and the
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// path class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_PATH_H
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#define LLVM_SUPPORT_PATH_H
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/DataTypes.h"
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#include <iterator>
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namespace llvm {
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namespace sys {
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namespace path {
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/// @name Lexical Component Iterator
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/// @{
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/// @brief Path iterator.
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///
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/// This is a bidirectional iterator that iterates over the individual
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/// components in \a path. The forward traversal order is as follows:
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/// * The root-name element, if present.
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/// * The root-directory element, if present.
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/// * Each successive filename element, if present.
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/// * Dot, if one or more trailing non-root slash characters are present.
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/// The backwards traversal order is the reverse of forward traversal.
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///
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/// Iteration examples. Each component is separated by ',':
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/// @code
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/// / => /
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/// /foo => /,foo
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/// foo/ => foo,.
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/// /foo/bar => /,foo,bar
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/// ../ => ..,.
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/// C:\foo\bar => C:,/,foo,bar
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/// @endcode
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class const_iterator {
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StringRef Path; ///< The entire path.
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StringRef Component; ///< The current component. Not necessarily in Path.
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size_t Position; ///< The iterators current position within Path.
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// An end iterator has Position = Path.size() + 1.
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friend const_iterator begin(StringRef path);
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friend const_iterator end(StringRef path);
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public:
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typedef const StringRef value_type;
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typedef ptrdiff_t difference_type;
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typedef value_type &reference;
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typedef value_type *pointer;
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typedef std::bidirectional_iterator_tag iterator_category;
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reference operator*() const { return Component; }
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pointer operator->() const { return &Component; }
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const_iterator &operator++(); // preincrement
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const_iterator &operator++(int); // postincrement
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const_iterator &operator--(); // predecrement
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const_iterator &operator--(int); // postdecrement
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bool operator==(const const_iterator &RHS) const;
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bool operator!=(const const_iterator &RHS) const;
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/// @brief Difference in bytes between this and RHS.
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ptrdiff_t operator-(const const_iterator &RHS) const;
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};
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typedef std::reverse_iterator<const_iterator> reverse_iterator;
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/// @brief Get begin iterator over \a path.
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/// @param path Input path.
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/// @returns Iterator initialized with the first component of \a path.
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const_iterator begin(StringRef path);
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/// @brief Get end iterator over \a path.
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/// @param path Input path.
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/// @returns Iterator initialized to the end of \a path.
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const_iterator end(StringRef path);
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/// @brief Get reverse begin iterator over \a path.
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/// @param path Input path.
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/// @returns Iterator initialized with the first reverse component of \a path.
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inline reverse_iterator rbegin(StringRef path) {
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return reverse_iterator(end(path));
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}
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/// @brief Get reverse end iterator over \a path.
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/// @param path Input path.
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/// @returns Iterator initialized to the reverse end of \a path.
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inline reverse_iterator rend(StringRef path) {
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return reverse_iterator(begin(path));
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}
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/// @}
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/// @name Lexical Modifiers
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/// @{
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/// @brief Remove the last component from \a path unless it is the root dir.
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///
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/// @code
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/// directory/filename.cpp => directory/
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/// directory/ => directory
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/// filename.cpp => <empty>
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/// / => /
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/// @endcode
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///
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/// @param path A path that is modified to not have a file component.
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void remove_filename(SmallVectorImpl<char> &path);
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/// @brief Replace the file extension of \a path with \a extension.
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///
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/// @code
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/// ./filename.cpp => ./filename.extension
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/// ./filename => ./filename.extension
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/// ./ => ./.extension
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/// @endcode
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///
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/// @param path A path that has its extension replaced with \a extension.
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/// @param extension The extension to be added. It may be empty. It may also
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/// optionally start with a '.', if it does not, one will be
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/// prepended.
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void replace_extension(SmallVectorImpl<char> &path, const Twine &extension);
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/// @brief Append to path.
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///
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/// @code
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/// /foo + bar/f => /foo/bar/f
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/// /foo/ + bar/f => /foo/bar/f
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/// foo + bar/f => foo/bar/f
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/// @endcode
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///
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/// @param path Set to \a path + \a component.
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/// @param a The component to be appended to \a path.
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void append(SmallVectorImpl<char> &path, const Twine &a,
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const Twine &b = "",
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const Twine &c = "",
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const Twine &d = "");
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/// @brief Append to path.
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///
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/// @code
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/// /foo + [bar,f] => /foo/bar/f
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/// /foo/ + [bar,f] => /foo/bar/f
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/// foo + [bar,f] => foo/bar/f
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/// @endcode
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///
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/// @param path Set to \a path + [\a begin, \a end).
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/// @param begin Start of components to append.
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/// @param end One past the end of components to append.
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void append(SmallVectorImpl<char> &path,
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const_iterator begin, const_iterator end);
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/// @}
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/// @name Transforms (or some other better name)
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/// @{
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/// Convert path to the native form. This is used to give paths to users and
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/// operating system calls in the platform's normal way. For example, on Windows
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/// all '/' are converted to '\'.
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///
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/// @param path A path that is transformed to native format.
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/// @param result Holds the result of the transformation.
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void native(const Twine &path, SmallVectorImpl<char> &result);
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/// @}
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/// @name Lexical Observers
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/// @{
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/// @brief Get root name.
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///
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/// @code
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/// //net/hello => //net
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/// c:/hello => c: (on Windows, on other platforms nothing)
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/// /hello => <empty>
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/// @endcode
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///
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/// @param path Input path.
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/// @result The root name of \a path if it has one, otherwise "".
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const StringRef root_name(StringRef path);
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/// @brief Get root directory.
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///
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/// @code
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/// /goo/hello => /
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/// c:/hello => /
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/// d/file.txt => <empty>
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/// @endcode
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///
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/// @param path Input path.
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/// @result The root directory of \a path if it has one, otherwise
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/// "".
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const StringRef root_directory(StringRef path);
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/// @brief Get root path.
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///
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/// Equivalent to root_name + root_directory.
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///
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/// @param path Input path.
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/// @result The root path of \a path if it has one, otherwise "".
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const StringRef root_path(StringRef path);
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/// @brief Get relative path.
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///
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/// @code
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/// C:\hello\world => hello\world
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/// foo/bar => foo/bar
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/// /foo/bar => foo/bar
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/// @endcode
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///
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/// @param path Input path.
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/// @result The path starting after root_path if one exists, otherwise "".
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const StringRef relative_path(StringRef path);
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/// @brief Get parent path.
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///
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/// @code
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/// / => <empty>
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/// /foo => /
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/// foo/../bar => foo/..
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/// @endcode
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///
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/// @param path Input path.
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/// @result The parent path of \a path if one exists, otherwise "".
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const StringRef parent_path(StringRef path);
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/// @brief Get filename.
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///
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/// @code
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/// /foo.txt => foo.txt
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/// . => .
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/// .. => ..
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/// / => /
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/// @endcode
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///
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/// @param path Input path.
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/// @result The filename part of \a path. This is defined as the last component
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/// of \a path.
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const StringRef filename(StringRef path);
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/// @brief Get stem.
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///
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/// If filename contains a dot but not solely one or two dots, result is the
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/// substring of filename ending at (but not including) the last dot. Otherwise
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/// it is filename.
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///
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/// @code
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/// /foo/bar.txt => bar
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/// /foo/bar => bar
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/// /foo/.txt => <empty>
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/// /foo/. => .
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/// /foo/.. => ..
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/// @endcode
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///
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/// @param path Input path.
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/// @result The stem of \a path.
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const StringRef stem(StringRef path);
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/// @brief Get extension.
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///
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/// If filename contains a dot but not solely one or two dots, result is the
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/// substring of filename starting at (and including) the last dot, and ending
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/// at the end of \a path. Otherwise "".
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///
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/// @code
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/// /foo/bar.txt => .txt
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/// /foo/bar => <empty>
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/// /foo/.txt => .txt
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/// @endcode
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///
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/// @param path Input path.
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/// @result The extension of \a path.
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const StringRef extension(StringRef path);
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/// @brief Check whether the given char is a path separator on the host OS.
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///
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/// @param value a character
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/// @result true if \a value is a path separator character on the host OS
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bool is_separator(char value);
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/// @brief Get the typical temporary directory for the system, e.g.,
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/// "/var/tmp" or "C:/TEMP"
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///
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/// @param erasedOnReboot Whether to favor a path that is erased on reboot
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/// rather than one that potentially persists longer. This parameter will be
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/// ignored if the user or system has set the typical environment variable
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/// (e.g., TEMP on Windows, TMPDIR on *nix) to specify a temporary directory.
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///
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/// @param result Holds the resulting path name.
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void system_temp_directory(bool erasedOnReboot, SmallVectorImpl<char> &result);
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/// @brief Has root name?
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///
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/// root_name != ""
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///
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/// @param path Input path.
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/// @result True if the path has a root name, false otherwise.
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bool has_root_name(const Twine &path);
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/// @brief Has root directory?
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///
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/// root_directory != ""
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///
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/// @param path Input path.
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/// @result True if the path has a root directory, false otherwise.
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bool has_root_directory(const Twine &path);
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/// @brief Has root path?
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///
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/// root_path != ""
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///
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/// @param path Input path.
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/// @result True if the path has a root path, false otherwise.
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bool has_root_path(const Twine &path);
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/// @brief Has relative path?
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///
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/// relative_path != ""
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///
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/// @param path Input path.
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/// @result True if the path has a relative path, false otherwise.
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bool has_relative_path(const Twine &path);
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/// @brief Has parent path?
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///
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/// parent_path != ""
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///
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/// @param path Input path.
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/// @result True if the path has a parent path, false otherwise.
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bool has_parent_path(const Twine &path);
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/// @brief Has filename?
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///
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/// filename != ""
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///
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/// @param path Input path.
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/// @result True if the path has a filename, false otherwise.
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bool has_filename(const Twine &path);
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/// @brief Has stem?
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///
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/// stem != ""
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///
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/// @param path Input path.
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/// @result True if the path has a stem, false otherwise.
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bool has_stem(const Twine &path);
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/// @brief Has extension?
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///
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/// extension != ""
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///
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/// @param path Input path.
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/// @result True if the path has a extension, false otherwise.
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bool has_extension(const Twine &path);
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/// @brief Is path absolute?
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///
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/// @param path Input path.
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/// @result True if the path is absolute, false if it is not.
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bool is_absolute(const Twine &path);
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/// @brief Is path relative?
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///
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/// @param path Input path.
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/// @result True if the path is relative, false if it is not.
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bool is_relative(const Twine &path);
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} // end namespace path
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} // end namespace sys
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} // end namespace llvm
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#endif
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