X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=blobdiff_plain;f=source%2Ffs%2Fpath.cpp;fp=source%2Ffs%2Fpath.cpp;h=e514d36bfe490f5a4349f9a46946847221caa5f5;hp=0000000000000000000000000000000000000000;hb=af94bc926e301e9b871dc18662b4fa6e5614fdbf;hpb=fa77438b62207466c48620604c8cc34931080936

diff --git a/source/fs/path.cpp b/source/fs/path.cpp
new file mode 100644
index 0000000..e514d36
--- /dev/null
+++ b/source/fs/path.cpp
@@ -0,0 +1,279 @@
+/* $Id$
+
+This file is part of libmspfs
+Copyright © 2006-2008  Mikko Rasa, Mikkosoft Productions
+Distributed under the LGPL
+*/
+
+#include <msp/core/except.h>
+#include <msp/strings/utils.h>
+#include "path.h"
+#include "utils.h"
+
+using namespace std;
+
+namespace {
+
+inline bool is_windows_drive(const std::string &p)
+{ return (p.size()==2 && ((p[0]>='A' && p[0]<='Z') || (p[0]>='a' && p[0]<='z')) && p[1]==':'); }
+
+}
+
+namespace Msp {
+namespace FS {
+
+Path::Path()
+{ }
+
+Path::Path(const string &p)
+{
+	init(p);
+}
+
+Path::Path(const char *p)
+{
+	init(p);
+}
+
+unsigned Path::size() const
+{
+	if(path.empty())
+		return 0;
+	if(path.size()==1 && path[0]==DIRSEP)
+		return 1;
+
+	unsigned count = 1;
+	for(string::const_iterator i=path.begin(); i!=path.end(); ++i)
+		if(*i==DIRSEP) ++count;
+	return count;
+}
+
+bool Path::is_absolute() const
+{
+#ifdef WIN32
+	if(is_windows_drive((*this)[0]))
+		return true;
+#endif
+	if(path[0]==DIRSEP)
+		return true;
+	return false;
+}
+
+Path Path::subpath(unsigned start, unsigned count) const
+{
+	Path result;
+	Iterator i = begin();
+	for(unsigned j=0; (j<start && i!=end()); ++j)
+		++i;
+	for(unsigned j=0; (j<count && i!=end()); ++j)
+	{
+		result /= *i;
+		++i;
+	}
+	return result;
+}
+
+Path Path::operator/(const Path &p) const
+{
+	Path a = *this;
+	a /= p;
+	return a;
+}
+
+/**
+Attaches another path to the end of this one.  An absolute path replaces the
+existing data.  ".." elements annihilate the last component and "." elements
+are ignored.
+*/
+Path &Path::operator/=(const Path &p)
+{
+	if(p.is_absolute())
+		path = p.path;
+	else
+	{
+		for(Iterator i=p.begin(); i!=p.end(); ++i)
+			add_component(*i);
+	}
+	return *this;
+}
+
+string Path::operator[](int n) const
+{
+	if(n>=0)
+	{
+		for(Iterator i=begin(); i!=end(); ++i, --n)
+			if(!n)
+				return *i;
+	}
+	else
+	{
+		for(Iterator i=end(); i!=begin();)
+		{
+			--i;
+			if(!++n)
+				return *i;
+		}
+	}
+
+	throw InvalidParameterValue("Path component index out of range");
+}
+
+bool Path::operator==(const Path &p) const
+{
+#ifdef WIN32
+	return !strcasecmp(path, p.path);
+#else
+	return path==p.path;
+#endif
+}
+
+Path::Iterator Path::begin() const
+{
+	return Iterator(*this);
+}
+
+Path::Iterator Path::end() const
+{
+	Iterator i(*this);
+	i.start=i.end = std::string::npos;
+	return i;
+}
+
+void Path::init(const string &p)
+{
+	string::size_type start = 0;
+	if(p[0]=='/' || p[0]=='\\')
+		add_component(string(1, DIRSEP));
+	while(1)
+	{
+		string::size_type slash = p.find_first_of("/\\", start);
+		if(slash>start)
+			add_component(p.substr(start, slash-start));
+		if(slash==string::npos)
+			break;
+		start = slash+1;
+	}
+}
+
+/**
+Adds a single component to the path, emulating the cd command.  Fails horribly
+if comp contains a separator character.
+*/
+void Path::add_component(const string &comp)
+{
+	if(comp.empty())
+		;
+	else if(comp.size()==1 && comp[0]==DIRSEP)
+	{
+		// Replace the path with the root directory
+#ifdef WIN32
+		unsigned slash = path.find(DIRSEP);
+		if(is_windows_drive(path.substr(0, slash)))
+			path = path.substr(0, 2);
+		else
+#endif
+		path = comp;
+	}
+#ifdef WIN32
+	else if(is_windows_drive(comp))
+		path = comp;
+#endif
+	else if(comp=="..")
+	{
+		if(path.empty() || path==".")
+			path = comp;
+		// .. in root directory is a no-op
+		else if(path.size()==1 && path[0]==DIRSEP)
+			;
+#ifdef WIN32
+		else if(is_windows_drive(path))
+			;
+#endif
+		else
+		{
+			string::size_type slash = path.rfind(DIRSEP);
+			string::size_type start = (slash==string::npos ? 0 : slash+1);
+			if(!path.compare(start, string::npos, ".."))
+			{
+				// If the last component already is a .., add another
+				path += DIRSEP;
+				path += comp;
+			}
+			else if(slash==string::npos)
+				path = ".";
+			else
+			{
+				if(slash==0)
+					slash = 1;
+				// Otherwise, erase the last component
+				path.erase(slash, string::npos);
+			}
+		}
+	}
+	else if(comp!="." || path.empty())
+	{
+		if(comp!="." && path.empty())
+			path = ".";
+		if(path.size()>1 || (path.size()==1 && path[0]!=DIRSEP))
+			path += DIRSEP;
+		path += comp;
+	}
+}
+
+
+Path::Iterator::Iterator(const Path &p):
+	path(p),
+	start(0)
+{
+	if(path.path.empty())
+		start=end = string::npos;
+	else if(path.path[0]==DIRSEP)
+		end = 1;
+#ifdef WIN32
+	else if(path.path.size()>2 && path.path[2]==DIRSEP && is_windows_drive(path.path.substr(0, 2)))
+		end = 2;
+#endif
+	else
+		end = path.path.find(DIRSEP);
+}
+
+Path::Iterator &Path::Iterator::operator++()
+{
+	start = end;
+	if(start>=path.path.size())
+		return *this;
+	if(path.path[start]==DIRSEP)
+		++start;
+	end = path.path.find(DIRSEP, start);
+	return *this;
+}
+
+Path::Iterator &Path::Iterator::operator--()
+{
+	if(start==0)
+		return *this;
+
+	end = start;
+	if(end>1 && end<path.path.size() && path.path[end]!=DIRSEP)
+		--end;
+
+	start = path.path.rfind(DIRSEP, end-1);
+	if(start==string::npos)
+		start = 0;
+	else if(start<end-1)
+		++start;
+
+	return *this;
+}
+
+string Path::Iterator::operator*() const
+{
+	if(start>=path.path.size())
+		return string();
+	if(start==end)
+		return string();
+	return path.path.substr(start, end-start);
+}
+
+} // namespace FS
+} // namespace Msp