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https://github.com/c64scene-ar/llvm-6502.git
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dffde99644
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120329 91177308-0d34-0410-b5e6-96231b3b80d8
410 lines
11 KiB
C++
410 lines
11 KiB
C++
//===-- PathV2.cpp - Implement OS Path 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 implements the operating system PathV2 API.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/PathV2.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cctype>
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namespace {
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using llvm::StringRef;
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bool is_separator(const char value) {
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switch(value) {
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#ifdef LLVM_ON_WIN32
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case '\\': // fall through
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#endif
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case '/': return true;
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default: return false;
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}
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}
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#ifdef LLVM_ON_WIN32
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const StringRef separators = "\\/";
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const char prefered_separator = '\\';
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#else
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const StringRef separators = "/";
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const char prefered_separator = '/';
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#endif
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StringRef find_first_component(const StringRef &path) {
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// Look for this first component in the following order.
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// * empty (in this case we return an empty string)
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// * either C: or {//,\\}net.
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// * {/,\}
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// * {.,..}
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// * {file,directory}name
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if (path.empty())
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return path;
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// C:
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if (path.size() >= 2 && std::isalpha(path[0]) && path[1] == ':')
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return StringRef(path.begin(), 2);
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// //net
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if ((path.size() > 2) &&
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(path.startswith("\\\\") || path.startswith("//")) &&
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(path[2] != '\\' && path[2] != '/')) {
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// Find the next directory separator.
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size_t end = path.find_first_of("\\/", 2);
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if (end == StringRef::npos)
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return path;
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else
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return StringRef(path.begin(), end);
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}
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// {/,\}
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if (path[0] == '\\' || path[0] == '/')
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return StringRef(path.begin(), 1);
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if (path.startswith(".."))
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return StringRef(path.begin(), 2);
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if (path[0] == '.')
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return StringRef(path.begin(), 1);
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// * {file,directory}name
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size_t end = path.find_first_of("\\/", 2);
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if (end == StringRef::npos)
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return path;
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else
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return StringRef(path.begin(), end);
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return StringRef();
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}
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}
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namespace llvm {
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namespace sys {
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namespace path {
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const_iterator begin(const StringRef &path) {
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const_iterator i;
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i.Path = path;
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i.Component = find_first_component(path);
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i.Position = 0;
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return i;
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}
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const_iterator end(const StringRef &path) {
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const_iterator i;
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i.Path = path;
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i.Position = path.size();
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return i;
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}
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const_iterator::reference const_iterator::operator*() const {
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return Component;
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}
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const_iterator::pointer const_iterator::operator->() const {
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return &Component;
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}
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const_iterator &const_iterator::operator++() {
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assert(Position < Path.size() && "Tried to increment past end!");
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// Increment Position to past the current component
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Position += Component.size();
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// Check for end.
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if (Position == Path.size()) {
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Component = StringRef();
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return *this;
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}
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// Both POSIX and Windows treat paths that begin with exactly two separators
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// specially.
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bool was_net = Component.size() > 2 &&
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is_separator(Component[0]) &&
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Component[1] == Component[0] &&
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!is_separator(Component[2]);
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// Handle separators.
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if (is_separator(Path[Position])) {
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// Root dir.
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if (was_net
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#ifdef LLVM_ON_WIN32
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// c:/
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|| Component.endswith(":")
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#endif
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) {
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Component = StringRef(Path.begin() + Position, 1);
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return *this;
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}
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// Skip extra separators.
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while (Position != Path.size() &&
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is_separator(Path[Position])) {
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++Position;
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}
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// Treat trailing '/' as a '.'.
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if (Position == Path.size()) {
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--Position;
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Component = ".";
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return *this;
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}
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}
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// Find next component.
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size_t end_pos = Path.find_first_of(separators, Position);
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if (end_pos == StringRef::npos)
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end_pos = Path.size();
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Component = StringRef(Path.begin() + Position, end_pos - Position);
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return *this;
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}
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bool const_iterator::operator==(const const_iterator &RHS) const {
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return Path.begin() == RHS.Path.begin() &&
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Position == RHS.Position;
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}
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bool const_iterator::operator!=(const const_iterator &RHS) const {
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return !(*this == RHS);
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}
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error_code root_path(const StringRef &path, StringRef &result) {
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const_iterator b = begin(path),
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pos = b,
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e = end(path);
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if (b != e) {
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bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
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bool has_drive =
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#ifdef LLVM_ON_WIN32
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b->endswith(":");
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#else
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false;
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#endif
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if (has_net || has_drive) {
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if ((++pos != e) && is_separator((*pos)[0])) {
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// {C:/,//net/}, so get the first two components.
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result = StringRef(path.begin(), b->size() + pos->size());
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return make_error_code(errc::success);
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} else {
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// just {C:,//net}, return the first component.
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result = *b;
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return make_error_code(errc::success);
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}
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}
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// POSIX style root directory.
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if (is_separator((*b)[0])) {
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result = *b;
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return make_error_code(errc::success);
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}
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// No root_path.
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result = StringRef();
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return make_error_code(errc::success);
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}
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// No path :(.
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result = StringRef();
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return make_error_code(errc::success);
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}
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error_code root_name(const StringRef &path, StringRef &result) {
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const_iterator b = begin(path),
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e = end(path);
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if (b != e) {
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bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
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bool has_drive =
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#ifdef LLVM_ON_WIN32
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b->endswith(":");
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#else
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false;
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#endif
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if (has_net || has_drive) {
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// just {C:,//net}, return the first component.
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result = *b;
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return make_error_code(errc::success);
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}
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}
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// No path or no name.
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result = StringRef();
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return make_error_code(errc::success);
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}
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error_code root_directory(const StringRef &path, StringRef &result) {
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const_iterator b = begin(path),
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pos = b,
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e = end(path);
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if (b != e) {
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bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
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bool has_drive =
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#ifdef LLVM_ON_WIN32
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b->endswith(":");
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#else
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false;
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#endif
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if ((has_net || has_drive) &&
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// {C:,//net}, skip to the next component.
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(++pos != e) && is_separator((*pos)[0])) {
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result = *pos;
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return make_error_code(errc::success);
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}
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// POSIX style root directory.
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if (!has_net && is_separator((*b)[0])) {
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result = *b;
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return make_error_code(errc::success);
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}
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}
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// No path or no root.
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result = StringRef();
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return make_error_code(errc::success);
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}
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error_code has_root_name(const Twine &path, bool &result) {
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SmallString<128> storage;
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StringRef p = path.toStringRef(storage);
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if (error_code ec = root_name(p, p)) return ec;
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result = !p.empty();
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return make_error_code(errc::success);
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}
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error_code has_root_directory(const Twine &path, bool &result) {
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SmallString<128> storage;
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StringRef p = path.toStringRef(storage);
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if (error_code ec = root_directory(p, p)) return ec;
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result = !p.empty();
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return make_error_code(errc::success);
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}
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error_code relative_path(const StringRef &path, StringRef &result) {
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StringRef root;
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if (error_code ec = root_path(path, root)) return ec;
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result = StringRef(path.begin() + root.size(), path.size() - root.size());
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return make_error_code(errc::success);
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}
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error_code 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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SmallString<32> a_storage;
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SmallString<32> b_storage;
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SmallString<32> c_storage;
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SmallString<32> d_storage;
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SmallVector<StringRef, 4> components;
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if (!a.isTriviallyEmpty()) components.push_back(a.toStringRef(a_storage));
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if (!b.isTriviallyEmpty()) components.push_back(b.toStringRef(b_storage));
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if (!c.isTriviallyEmpty()) components.push_back(c.toStringRef(c_storage));
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if (!d.isTriviallyEmpty()) components.push_back(d.toStringRef(d_storage));
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for (SmallVectorImpl<StringRef>::const_iterator i = components.begin(),
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e = components.end();
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i != e; ++i) {
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bool path_has_sep = !path.empty() && is_separator(path[path.size() - 1]);
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bool component_has_sep = !i->empty() && is_separator((*i)[0]);
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bool is_root_name;
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if (error_code ec = has_root_name(*i, is_root_name)) return ec;
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if (path_has_sep) {
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// Strip separators from beginning of component.
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size_t loc = i->find_first_not_of(separators);
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StringRef c = StringRef(i->begin() + loc, i->size() - loc);
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// Append it.
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path.append(c.begin(), c.end());
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continue;
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}
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if (!component_has_sep && !(path.empty() && is_root_name)) {
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// Add a separator.
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path.push_back(prefered_separator);
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}
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path.append(i->begin(), i->end());
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}
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return make_error_code(errc::success);
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}
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error_code make_absolute(SmallVectorImpl<char> &path) {
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StringRef p(path.data(), path.size());
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bool rootName, rootDirectory;
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if (error_code ec = has_root_name(p, rootName)) return ec;
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if (error_code ec = has_root_directory(p, rootDirectory)) return ec;
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// Already absolute.
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if (rootName && rootDirectory)
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return make_error_code(errc::success);
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// All of the following conditions will need the current directory.
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SmallString<128> current_dir;
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if (error_code ec = current_path(current_dir)) return ec;
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// Relative path. Prepend the current directory.
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if (!rootName && !rootDirectory) {
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// Append path to the current directory.
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if (error_code ec = append(current_dir, p)) return ec;
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// Set path to the result.
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path.swap(current_dir);
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return make_error_code(errc::success);
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}
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if (!rootName && rootDirectory) {
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StringRef cdrn;
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if (error_code ec = root_name(current_dir, cdrn)) return ec;
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SmallString<128> curDirRootName(cdrn.begin(), cdrn.end());
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if (error_code ec = append(curDirRootName, p)) return ec;
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// Set path to the result.
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path.swap(curDirRootName);
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return make_error_code(errc::success);
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}
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if (rootName && !rootDirectory) {
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StringRef pRootName;
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StringRef bRootDirectory;
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StringRef bRelativePath;
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StringRef pRelativePath;
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if (error_code ec = root_name(p, pRootName)) return ec;
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if (error_code ec = root_directory(current_dir, bRootDirectory)) return ec;
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if (error_code ec = relative_path(current_dir, bRelativePath)) return ec;
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if (error_code ec = relative_path(p, pRelativePath)) return ec;
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SmallString<128> res;
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if (error_code ec = append(res, pRootName, bRootDirectory,
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bRelativePath, pRelativePath)) return ec;
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path.swap(res);
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return make_error_code(errc::success);
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}
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llvm_unreachable("All rootName and rootDirectory combinations should have "
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"occurred above!");
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}
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}
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}
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}
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// Include the truly platform-specific parts.
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#if defined(LLVM_ON_UNIX)
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#include "Unix/PathV2.inc"
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#endif
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#if defined(LLVM_ON_WIN32)
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#include "Windows/PathV2.inc"
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#endif
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