-#include <msp/strutils.h>
+/* $Id$
+
+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;
-#include <iostream>
+
+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 Path {
+namespace FS {
+
+Path::Path()
+{ }
-bool is_windows_drive(const std::string &p)
+Path::Path(const string &p)
{
- return (p.size()==2 && ((p[0]>='A' && p[0]<='Z') || (p[0]>='a' && p[0]<='z')) && p[1]==':');
+ init(p);
+}
+
+Path::Path(const char *p)
+{
+ init(p);
}
-/**
-Returns the number of components in the path.
-*/
unsigned Path::size() const
{
- if(!path.size()) return 0;
- if(path.size()==1 && path[0]==DIRCHAR) return 1;
- unsigned count=1;
+ 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==DIRCHAR) ++count;
+ if(*i==DIRSEP) ++count;
return count;
}
bool Path::is_absolute() const
{
#ifdef WIN32
- if(is_windows_drive((*this)[0])) return true;
+ if(is_windows_drive((*this)[0]))
+ return true;
#endif
- if(path[0]==DIRCHAR) return true;
+ if(path[0]==DIRSEP)
+ return true;
return false;
}
Path Path::subpath(unsigned start, unsigned count) const
{
Path result;
- iterator i=begin();
+ Iterator i = begin();
for(unsigned j=0; (j<start && i!=end()); ++j)
++i;
for(unsigned j=0; (j<count && i!=end()); ++j)
{
- result/=*i;
+ 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
Path &Path::operator/=(const Path &p)
{
if(p.is_absolute())
- path=p.path;
+ path = p.path;
else
{
- for(iterator i=p.begin(); i!=p.end(); ++i)
- {
- if(*i=="..")
- {
- unsigned slash=path.rfind(DIRCHAR);
-#ifdef WIN32
- if(is_windows_drive(path.substr(0,slash))) ++slash;
-#endif
- if(slash==0) ++slash;
- if(slash==string::npos)
- path="";
- else
- path.erase(slash);
- }
- else if(*i!=".")
- {
- if(path.size()>1 || (path.size()==1 && path[0]!=DIRCHAR))
- path+=DIRCHAR;
- path+=*i;
- }
- }
+ for(Iterator i=p.begin(); i!=p.end(); ++i)
+ add_component(*i);
}
return *this;
}
-/**
-Returns the path component at the specified index. Negative indices count from
-the end of the path.
-*/
string Path::operator[](int n) const
{
if(n>=0)
{
- for(iterator i=begin(); i!=end(); ++i,--n)
- if(!n) return *i;
+ for(Iterator i=begin(); i!=end(); ++i, --n)
+ if(!n)
+ return *i;
}
else
{
- for(iterator i=--end();; --i)
+ for(Iterator i=end(); i!=begin();)
{
- if(!++n) return *i;
- if(i==begin()) break;
+ --i;
+ if(!++n)
+ return *i;
}
}
- return "";
+ throw InvalidParameterValue("Path component index out of range");
}
bool Path::operator==(const Path &p) const
#endif
}
-void Path::init(const std::string &p)
+Path::Iterator Path::begin() const
+{
+ return Iterator(*this);
+}
+
+Path::Iterator Path::end() const
{
- unsigned start=0;
- bool absolute=false;
- if(p[0]==DIRCHAR)
- absolute=true;
+ 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)
{
- unsigned slash=p.find_first_of("/\\",start);
+ string::size_type slash = p.find_first_of("/\\", start);
if(slash>start)
- {
- if(path.size() || absolute)
- path+=DIRCHAR;
- path+=p.substr(start,slash-start);
- }
+ add_component(p.substr(start, slash-start));
if(slash==string::npos)
break;
- start=slash+1;
+ start = slash+1;
}
}
-Path::iterator::iterator(const Path &p):
+/**
+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[0]==DIRCHAR)
- end=1;
+ if(path.path.empty())
+ start=end = string::npos;
+ else if(path.path[0]==DIRSEP)
+ end = 1;
#ifdef WIN32
- else if(path.path[2]==DIRCHAR && is_windows_drive(path.path.substr(0,2)))
- end=2;
+ 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(DIRCHAR);
+ end = path.path.find(DIRSEP);
}
-Path::iterator &Path::iterator::operator++()
+Path::Iterator &Path::Iterator::operator++()
{
- start=end;
- if(start>=path.path.size()) return *this;
- if(path.path[start]==DIRCHAR) ++start;
- end=path.path.find(DIRCHAR,start);
+ 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--()
+Path::Iterator &Path::Iterator::operator--()
{
- end=start;
- if(end==0) return *this;
- if(end>1 && end<path.path.size() && path.path[end]!=DIRCHAR) --end;
- start=path.path.rfind(DIRCHAR,end-1);
+ 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;
+ start = 0;
else if(start<end-1)
++start;
+
return *this;
}
-string Path::iterator::operator*() const
+string Path::Iterator::operator*() const
{
- if(start>=path.path.size()) return "";
- if(start==end) return "";
- return path.path.substr(start,end-start);
+ if(start>=path.path.size())
+ return string();
+ if(start==end)
+ return string();
+ return path.path.substr(start, end-start);
}
-} // namespace Path
+} // namespace FS
} // namespace Msp
projects / libs / core.git / blobdiff