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/var/tmp/portage/media-libs/openusd-9999/work/openusd-9999/pxr/usd/lib/ar/packageUtils.cpp
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// | |
// Copyright 2018 Pixar | |
// | |
// Licensed under the Apache License, Version 2.0 (the "Apache License") | |
// with the following modification; you may not use this file except in | |
// compliance with the Apache License and the following modification to it: | |
// Section 6. Trademarks. is deleted and replaced with: | |
// | |
// 6. Trademarks. This License does not grant permission to use the trade | |
// names, trademarks, service marks, or product names of the Licensor | |
// and its affiliates, except as required to comply with Section 4(c) of | |
// the License and to reproduce the content of the NOTICE file. | |
// | |
// You may obtain a copy of the Apache License at | |
// | |
// http://www.apache.org/licenses/LICENSE-2.0 | |
// | |
// Unless required by applicable law or agreed to in writing, software | |
// distributed under the Apache License with the above modification is | |
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
// KIND, either express or implied. See the Apache License for the specific | |
// language governing permissions and limitations under the Apache License. | |
// | |
#include "pxr/pxr.h" | |
#include "pxr/usd/ar/packageUtils.h" | |
#include "pxr/base/tf/diagnostic.h" | |
#include "pxr/base/tf/pathUtils.h" | |
#include "pxr/base/tf/stringUtils.h" | |
PXR_NAMESPACE_OPEN_SCOPE | |
namespace | |
{ | |
// Returns iterator in \p path pointing to outermost ']' delimiter. | |
std::string::const_iterator | |
_FindOutermostClosingDelimiter(const std::string& path) | |
{ | |
if (path.empty() || path.back() != ']') { | |
return path.end(); | |
} | |
return path.end() - 1; | |
} | |
// Delete rvalue overload to avoid returning an iterator to a temporary. | |
std::string::const_iterator | |
_FindOutermostClosingDelimiter(std::string&& path) = delete; | |
// Returns iterator in \p path pointing to the innermost ']' delimiter. | |
std::string::const_iterator | |
_FindInnermostClosingDelimiter(const std::string& path) | |
{ | |
if (path.empty() || path.back() != ']') { | |
return path.end(); | |
} | |
for (auto it = path.rbegin(); it != path.rend(); ++it) { | |
if (*it == '\\') { | |
// The previous ']' character was escaped, so the innermost | |
// delimiter is really the one before that character. | |
return (it - 1).base(); | |
} | |
else if (*it != ']') { | |
return it.base(); | |
} | |
} | |
return path.end(); | |
} | |
// Delete rvalue overload to avoid returning an iterator to a temporary. | |
std::string::const_iterator | |
_FindInnermostClosingDelimiter(std::string&& path) = delete; | |
// Given iterator \p closingDelimIt in \p path pointing to a closing | |
// ']' character, returns iterator to the corresponding opening '[' | |
// character, or path.end() if one can't be found. | |
std::string::const_iterator | |
_FindMatchingOpeningDelimiter( | |
const std::string& path, | |
std::string::const_iterator closingDelimIt) | |
{ | |
size_t numOpenNeeded = 1; | |
std::string::const_reverse_iterator revIt(closingDelimIt); | |
for (; revIt != path.rend() && numOpenNeeded != 0; ++revIt) { | |
if (*revIt == '[' || *revIt == ']') { | |
// Ignore this delimiter if it's been escaped. | |
auto prevCharIt = revIt + 1; | |
if (prevCharIt != path.rend() && *prevCharIt == '\\') { | |
continue; | |
} | |
numOpenNeeded += (*revIt == '[') ? -1 : 1; | |
} | |
} | |
return (numOpenNeeded == 0) ? revIt.base() : path.end(); | |
} | |
// Escape delimiters in the given path to preserve them when placing | |
// placing the path into the packaged part of a package-relative path. | |
// | |
// If path is a package-relative path, we assume the packaged portion of | |
// that path has already been escaped and only process the package portion. | |
std::string | |
_EscapeDelimiters(const std::string& path) | |
{ | |
if (path.empty()) { | |
return path; | |
} | |
auto escapeRangeBegin = path.begin(), escapeRangeEnd = path.end(); | |
if (path.back() == ']') { | |
auto outermostOpenIt = | |
_FindMatchingOpeningDelimiter(path, path.end() - 1); | |
if (outermostOpenIt != path.end()) { | |
escapeRangeEnd = outermostOpenIt; | |
} | |
} | |
std::string escapedString(escapeRangeBegin, escapeRangeEnd); | |
escapedString = TfStringReplace(escapedString, "[", "\\["); | |
escapedString = TfStringReplace(escapedString, "]", "\\]"); | |
return escapedString + std::string(escapeRangeEnd, path.end()); | |
} | |
// Unescape delimiters in the given path to give clients the 'real' path | |
// when extracting paths from the packaged part of a package-relative path. | |
// | |
// If path is a package-relative path, we assume the packaged portion of | |
// that path has already been escaped and only process the package portion. | |
std::string | |
_UnescapeDelimiters(const std::string& path) | |
{ | |
if (path.empty()) { | |
return path; | |
} | |
auto escapeRangeBegin = path.begin(), escapeRangeEnd = path.end(); | |
if (path.back() == ']') { | |
auto outermostOpenIt = | |
_FindMatchingOpeningDelimiter(path, path.end() - 1); | |
if (outermostOpenIt != path.end()) { | |
escapeRangeEnd = outermostOpenIt; | |
} | |
} | |
std::string escapedString(escapeRangeBegin, escapeRangeEnd); | |
escapedString = TfStringReplace(escapedString, "\\[", "["); | |
escapedString = TfStringReplace(escapedString, "\\]", "]"); | |
return escapedString + std::string(escapeRangeEnd, path.end()); | |
} | |
} // end anonymous namespace | |
bool | |
ArIsPackageRelativePath( | |
const std::string& path) | |
{ | |
return !path.empty() && path.back() == ']' && | |
_FindMatchingOpeningDelimiter(path, path.end() - 1) != path.end(); | |
} | |
namespace | |
{ | |
template <class Iter> | |
const std::string& | |
_Get(Iter it) | |
{ | |
return *it; | |
} | |
const std::string& | |
_Get(const std::string* const* it) | |
{ | |
return **it; | |
} | |
template <class Iter> | |
std::string | |
_JoinPackageRelativePath(Iter begin, Iter end) | |
{ | |
Iter pathIt = begin; | |
for (; pathIt != end; ++pathIt) { | |
if (!_Get(pathIt).empty()) { | |
break; | |
} | |
} | |
if (pathIt == end) { | |
return std::string(); | |
} | |
// Start the result packageRelativePath with the first non-empty path | |
// in the range and determine where the next path should be inserted. | |
// If this path is itself a package-relative path, this insert location | |
// should come just before the innermost ']' delimiter. | |
std::string packageRelativePath = _Get(pathIt++); | |
size_t insertIdx = packageRelativePath.length(); | |
if (packageRelativePath.back() == ']') { | |
auto innermostCloseRevIt = std::find_if( | |
packageRelativePath.rbegin(), packageRelativePath.rend(), | |
[](char c) { return c != ']'; }); | |
insertIdx = std::distance( | |
packageRelativePath.begin(), innermostCloseRevIt.base()); | |
} | |
// Loop through and insert the rest of the paths. | |
for (; pathIt != end; ++pathIt) { | |
if (_Get(pathIt).empty()) { | |
continue; | |
} | |
// Since we're enclosing this path in delimiters, we need to escape | |
// any existing delimiters. | |
const std::string pathToInsert = | |
'[' + _EscapeDelimiters(_Get(pathIt)) + ']'; | |
packageRelativePath.insert(insertIdx, pathToInsert); | |
insertIdx += pathToInsert.length() - 1; | |
} | |
return packageRelativePath; | |
} | |
} // end anonymous namespace | |
std::string | |
ArJoinPackageRelativePath( | |
const std::vector<std::string>& paths) | |
{ | |
return _JoinPackageRelativePath(paths.begin(), paths.end()); | |
} | |
std::string | |
ArJoinPackageRelativePath( | |
const std::pair<std::string, std::string>& paths) | |
{ | |
const std::string* const arr[2] = { &paths.first, &paths.second }; | |
return _JoinPackageRelativePath(arr, arr + 2); | |
} | |
std::string | |
ArJoinPackageRelativePath( | |
const std::string& packagePath, const std::string& packagedPath) | |
{ | |
const std::string* const arr[2] = { &packagePath, &packagedPath }; | |
return _JoinPackageRelativePath(arr, arr + 2); | |
} | |
std::pair<std::string, std::string> | |
ArSplitPackageRelativePathOuter( | |
const std::string& path) | |
{ | |
// For example, given a path like "/dir/foo.package[bar.package[baz.file]]", | |
// find the range [outermostOpenIt, outermostCloseIt] containing | |
// "[bar.package[baz.file]]" | |
auto outermostCloseIt = _FindOutermostClosingDelimiter(path); | |
if (outermostCloseIt == path.end()) { | |
return std::make_pair(path, std::string()); | |
} | |
auto outermostOpenIt = _FindMatchingOpeningDelimiter(path, outermostCloseIt); | |
if (outermostOpenIt == path.end()) { | |
return std::make_pair(path, std::string()); | |
} | |
// The package path is everything before the outermost opening delimiter. | |
std::string packagePath(path.begin(), outermostOpenIt); | |
// Drop the opening and closing delimiters to create the packaged path, | |
// making sure to unescape delimiters now that this path has been split. | |
std::string packagedPath(outermostOpenIt + 1, outermostCloseIt); | |
packagedPath = _UnescapeDelimiters(packagedPath); | |
return std::make_pair(std::move(packagePath), std::move(packagedPath)); | |
} | |
std::pair<std::string, std::string> | |
ArSplitPackageRelativePathInner( | |
const std::string& path) | |
{ | |
// For example, given a path like "/dir/foo.package[bar.package[baz.file]]", | |
// find the range [innermostOpenIt, innermostCloseIt] containing | |
// "[baz.file]" | |
auto innermostCloseIt = _FindInnermostClosingDelimiter(path); | |
if (innermostCloseIt == path.end()) { | |
return std::make_pair(path, std::string()); | |
} | |
auto innermostOpenIt = _FindMatchingOpeningDelimiter(path, innermostCloseIt); | |
if (innermostOpenIt == path.end()) { | |
return std::make_pair(path, std::string()); | |
} | |
// Erase "[baz.file]" from the given path to generate the package path. | |
std::string packagePath = path; | |
packagePath.erase( | |
std::distance(path.begin(), innermostOpenIt), | |
std::distance(innermostOpenIt, innermostCloseIt) + 1); | |
// Drop the opening and closing delimiters to create the packaged path, | |
// making sure to unescape delimiters now that this path has been split. | |
std::string packagedPath(innermostOpenIt + 1, innermostCloseIt); | |
packagedPath = _UnescapeDelimiters(packagedPath); | |
return std::make_pair(std::move(packagePath), std::move(packagedPath)); | |
} | |
PXR_NAMESPACE_CLOSE_SCOPE |
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