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paths.windows.clay
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paths.windows.clay
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import win32;
import io.errors.*;
import data.algorithms.(findIf,reverseFindIf,reverseInPlace,beginsWith?);
import data.strings.*;
import data.vectors.*;
import data.sequences.*;
/// @section separators
alias PATH_SEPARATOR1 = '\\';
alias PATH_SEPARATOR2 = '/';
alias DRIVE_SEPARATOR = ':';
alias PATH_LIST_SEPARATOR = ';';
pathSeparator?(c) = (c == PATH_SEPARATOR1) or (c == PATH_SEPARATOR2);
pathOrDriveSeparator?(c) = pathSeparator?(c) or (c == DRIVE_SEPARATOR);
private beginsWithPathSeparator?(s) = (not empty?(s)) and pathSeparator?(front(s));
private endsWithPathSeparator?(s) = (not empty?(s)) and pathSeparator?(back(s));
private endsWithPathOrDriveSeparator?(s) =
(not empty?(s)) and pathOrDriveSeparator?(back(s));
private findPathSeparator(path) = findIf(path, pathSeparator?);
private reverseFindPathSeparator(path) = reverseFindIf(path, pathSeparator?);
private absoluteDirectory?(s) = beginsWithPathSeparator?(s);
/// @section path predicates
private uppercaseLetter?(c) = (c >= 'A') and (c <= 'Z');
private lowercaseLetter?(c) = (c >= 'a') and (c <= 'z');
private letter?(c) = lowercaseLetter?(c) or uppercaseLetter?(c);
private hasDrive?(path) = (size(path) >= 2) and letter?(path[0]) and (path[1] == ':');
private uncPath?(path) = beginsWith?(path, "//") or beginsWith?(path, "\\\\");
/// @section slicedWindowsPath. returns (volume, directory, name)
slicedWindowsPath(path) {
if (uncPath?(path))
return ..slicedUNCPath(path);
if (hasDrive?(path)) {
var volume = slicedUpto(path, 2);
var rest = slicedFrom(path, 2);
return volume, ..slicedVolumeRelativePath(rest);
}
return slicedUpto(path,0), ..slicedVolumeRelativePath(path);
}
private slicedUNCPath(path) {
var pathEnd = end(path);
var machineEnd = findPathSeparator(slicedFrom(path, 2));
if ((machineEnd == pathEnd) or (machineEnd+1 == pathEnd))
badUNCPath(path);
var shareEnd = findPathSeparator(slicedFrom(path, machineEnd+1));
var volume, rest = slicedUpto(path, shareEnd), slicedFrom(path, shareEnd);
return volume, ..slicedVolumeRelativePath(rest);
}
record InvalidUNCPath(path:String);
instance IOError (InvalidUNCPath);
private badUNCPath(path) {
throw InvalidUNCPath(String(path));
}
private slicedVolumeRelativePath(path) {
var path2 = directoryTailTrimmed(path);
var p = reverseFindPathSeparator(path2);
var parent, child = slicedUpto(path2, p), slicedFrom(path2, p);
return directoryTailTrimmed(parent), child;
}
private directoryTailTrimmed(path) {
if (empty?(path))
return slicedUpto(path, 0);
var p = reverseFindIf(begin(path)+1, end(path), c => not pathSeparator?(c));
return slicedUpto(path, p);
}
/// @section splitWindowsPath, slicedPath, splitPath, pathComponents
splitWindowsPath(path) = ..mapValues(force, ..slicedWindowsPath(path));
slicedPath(path) {
var volume, directory, name = ..slicedWindowsPath(path);
return sliced(path, begin(volume), end(directory)), name;
}
pathDirname(path) = String(nthValue(#0, ..slicedPath(path)));
pathBasename(path) = String(nthValue(#1, ..slicedPath(path)));
splitPath(path) = ..mapValues(force, ..slicedPath(path));
pathComponents(path) {
var parts = Vector[String]();
var volume, directory, name = ..slicedWindowsPath(path);
var parent, child = directory, name;
while (not empty?(child)) {
push(parts, String(child));
parent, child = ..slicedPath(parent);
}
if (not empty?(parent))
push(parts, String(parent));
if (not empty?(volume))
push(parts, String(volume));
reverseInPlace(parts);
return move(parts);
}
/// @section joinPath
define joinPath;
[..S when allValues?(String?, ..S)]
overload joinPath(..parts:S) {
var volume, directory, name = String(), String(), String();
..for (part in parts)
appendPath(volume, directory, name, part);
ref result = volume;
appendComponent(result, directory);
appendComponent(result, name);
return move(result);
}
[A when String?(SequenceElementType(A))]
overload joinPath(parts:A) {
var volume, directory, name = String(), String(), String();
for (part in parts)
appendPath(volume, directory, name, part);
ref result = volume;
appendComponent(result, directory);
appendComponent(result, name);
return move(result);
}
private appendPath(volume:String, directory:String, name:String, part) {
var volume2, directory2, name2 = ..slicedWindowsPath(part);
if (not empty?(volume2)) {
volume, directory, name = ..mapValues(String, volume2, directory2, name2);
return;
}
if (absoluteDirectory?(directory2)) {
directory, name = ..mapValues(String, directory2, name2);
return;
}
appendComponent(directory, name);
appendComponent(directory, directory2);
name = String(name2);
}
private appendComponent(base:String, suffix) {
if ((not empty?(base))
and (not endsWithPathOrDriveSeparator?(base))
and (not beginsWithPathSeparator?(suffix)))
{
push(base, '\\');
}
push(base, suffix);
}
/// @section pathExists?
pathExists?(p) {
var result = win32.GetFileAttributesA(cstring(p));
return result != win32.INVALID_FILE_ATTRIBUTES;
}
pathIsDirectory?(p) {
var result = win32.GetFileAttributesA(cstring(p));
return result != win32.INVALID_FILE_ATTRIBUTES and (result & win32.FILE_ATTRIBUTE_DIRECTORY) != 0;
}
pathIsRegularFile?(p) {
var result = win32.GetFileAttributesA(cstring(p));
return result != win32.INVALID_FILE_ATTRIBUTES and (result & win32.FILE_ATTRIBUTE_DIRECTORY) == 0;
}