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ENH: Re-implemented CollapseFullPath to not need to change directories. Operation is now fully string based.

This commit is contained in:
Brad King 2005-03-25 08:09:00 -05:00
parent 7219c7a75c
commit 4ba14d1278
1 changed files with 65 additions and 43 deletions
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108
Source/kwsys/SystemTools.cxx
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@ -2085,60 +2085,82 @@ void SystemTools::CheckTranslationPath(kwsys_stl::string & path)
path.erase(path.end()-1, path.end());
}
kwsys_stl::string SystemTools::CollapseFullPath(const char* in_relative,
void
SystemToolsAppendComponents(
kwsys_stl::vector<kwsys_stl::string>& out_components,
kwsys_stl::vector<kwsys_stl::string>::const_iterator first,
kwsys_stl::vector<kwsys_stl::string>::const_iterator last)
{
for(kwsys_stl::vector<kwsys_stl::string>::const_iterator i = first;
i != last; ++i)
{
if(*i == "..")
{
if(out_components.begin() != out_components.end())
{
out_components.erase(out_components.end()-1, out_components.end());
}
}
else if(*i != "." && *i != "")
{
out_components.push_back(*i);
}
}
}
kwsys_stl::string SystemTools::CollapseFullPath(const char* in_path,
const char* in_base)
{
kwsys_stl::string orig;
// Collect the output path components.
kwsys_stl::vector<kwsys_stl::string> out_components;
// Change to base of relative path.
if(in_base)
{
// Save original working directory.
orig = SystemTools::GetCurrentWorkingDirectory();
Chdir(in_base);
}
// Split the input path components.
kwsys_stl::vector<kwsys_stl::string> path_components;
SystemTools::SplitPath(in_path, path_components);
kwsys_stl::string dir, file;
SystemTools::SplitProgramPath(in_relative, dir, file, false);
if(dir.size() == 0 &&
in_relative && strlen(in_relative) > 0 &&
in_relative[0] == '/')
{
dir = "/";
}
// Resolve relative path.
kwsys_stl::string newDir;
if(!(dir == ""))
// If the input path is relative, start with a base path.
if(path_components[0].length() == 0)
{
Realpath(dir.c_str(), newDir);
}
else
{
newDir = SystemTools::GetCurrentWorkingDirectory();
}
if(in_base)
{
// Restore original working directory.
Chdir(orig.c_str());
}
// Construct and return the full path.
kwsys_stl::string newPath = newDir;
if(!(file == ""))
{
if(!(newDir.size() == 1 && newDir[0] == '/'))
kwsys_stl::vector<kwsys_stl::string> base_components;
if(in_base)
{
newPath += "/";
// Use the given base path.
SystemTools::SplitPath(in_base, base_components);
}
newPath += file;
else
{
// Use the current working directory as a base path.
char buf[2048];
if(const char* cwd = Getcwd(buf, 2048))
{
SystemTools::SplitPath(cwd, base_components);
}
else
{
// ??
}
}
// Append base path components to the output path.
out_components.push_back(base_components[0]);
SystemToolsAppendComponents(out_components,
base_components.begin()+1,
base_components.end());
}
// Now we need to update the translation table with this potentially new path
SystemTools::AddTranslationPath(newPath.c_str(), in_relative);
// Append input path components to the output path.
SystemToolsAppendComponents(out_components,
path_components.begin(),
path_components.end());
// Transform the path back to a string.
kwsys_stl::string newPath = SystemTools::JoinPath(out_components);
// Update the translation table with this potentially new path.
SystemTools::AddTranslationPath(newPath.c_str(), in_path);
SystemTools::CheckTranslationPath(newPath);
// Return the reconstructed path.
return newPath;
}