From f5b411380649c8fc42204ad7eed1dda1fce34ad9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emmanuel=20Beno=C3=AEt?= <tseeker@nocternity.net>
Date: Tue, 26 Dec 2017 13:18:01 +0100
Subject: [PATCH] Filesystem abstraction prototype - Paths "finished"

Untested and I might have forgotten some useful shit, but ah well.
---
 p-filesystem.cc | 144 ++++++++++++++++++++++++++++++++++++++++++++++++
 p-filesystem.hh |  14 +++++
 2 files changed, 158 insertions(+)

diff --git a/p-filesystem.cc b/p-filesystem.cc
index 690a717..5fc8f39 100644
--- a/p-filesystem.cc
+++ b/p-filesystem.cc
@@ -180,3 +180,147 @@ int32_t T_FSPath::compareTo(
 	}
 	return cmp;
 }
+
+/*----------------------------------------------------------------------------*/
+
+T_FSPath T_FSPath::parent( ) const noexcept
+{
+	T_FSPath p{ *this };
+	if ( p.components_.size( ) ) {
+		p.components_.removeLast( );
+	}
+	return p;
+}
+
+T_FSPath T_FSPath::child(
+		T_String const& name ) const noexcept
+{
+	T_FSPath c{ *this };
+	c.components_.add( name );
+	c.valid_ = c.valid_ && IsValidComponent( name );
+	return c;
+}
+
+T_FSPath T_FSPath::operator +(
+		T_FSPath const& other ) const noexcept
+{
+	T_FSPath p{ *this };
+	if ( other.root_ ) {
+		p.valid_ = false;
+	} else {
+		p.valid_ = p.valid_ && other.valid_;
+	}
+	p.components_.addAll( other.components_ );
+	return p;
+}
+
+/*----------------------------------------------------------------------------*/
+
+bool T_FSPath::inDirectoryOf(
+		T_FSPath const& other ) const noexcept
+{
+	if ( &other == this ) {
+		return false;
+	}
+	if ( M_CMPSTR_( root_ , other.root_ ) != 0 ) {
+		return false;
+	}
+
+	const auto nc{ components_.size( ) };
+	if ( nc != other.components_.size( ) || nc == 0 ) {
+		return false;
+	}
+
+	for ( auto i = 0u ; i < nc - 1 ; i ++ ) {
+		if ( M_CMPSTR_( components_[ i ] , other.components_[ i ] ) != 0 ) {
+			return false;
+		}
+	}
+
+	return M_CMPSTR_( components_[ nc - 1 ] , other.components_[ nc - 1 ] ) != 0;
+}
+
+bool T_FSPath::isParentOf(
+		T_FSPath const& other ) const noexcept
+{
+	if ( &other == this ) {
+		return false;
+	}
+	if ( M_CMPSTR_( root_ , other.root_ ) != 0 ) {
+		return false;
+	}
+
+	const auto nc{ components_.size( ) };
+	if ( nc + 1 != other.components_.size( ) ) {
+		return false;
+	}
+
+	for ( auto i = 0u ; i < nc ; i ++ ) {
+		if ( M_CMPSTR_( components_[ i ] , other.components_[ i ] ) != 0 ) {
+			return false;
+		}
+	}
+	return true;
+}
+
+bool T_FSPath::isAbove(
+		T_FSPath const& other ) const noexcept
+{
+	if ( &other == this ) {
+		return false;
+	}
+	if ( M_CMPSTR_( root_ , other.root_ ) != 0 ) {
+		return false;
+	}
+
+	const auto nc{ components_.size( ) };
+	if ( nc >= other.components_.size( ) ) {
+		return false;
+	}
+
+	for ( auto i = 0u ; i < nc ; i ++ ) {
+		if ( M_CMPSTR_( components_[ i ] , other.components_[ i ] ) != 0 ) {
+			return false;
+		}
+	}
+	return true;
+}
+
+/*----------------------------------------------------------------------------*/
+
+bool T_FSPath::isCanonical( ) const noexcept
+{
+	if ( !valid_ ) {
+		return false;
+	}
+
+	auto const nc{ components_.size( ) };
+	for ( auto i = 0u ; i < nc ; i ++ ) {
+		if ( components_[ i ] == "." || components_[ i ] == ".." ) {
+			return false;
+		}
+	}
+	return nc > 0;
+}
+
+T_FSPath T_FSPath::canonical( ) const noexcept
+{
+	auto const nc{ components_.size( ) };
+	if ( !( valid_ && nc ) ) {
+		return *this;
+	}
+
+	T_FSPath np;
+	np.root_ = root_;
+	for ( auto i = 0u ; i < nc ; i ++ ) {
+		auto const& cmp{ components_[ i ] };
+		if ( cmp == ".." ) {
+			if ( np.components_.size( ) ) {
+				np.components_.removeLast( );
+			}
+		} else if ( cmp != "." ) {
+			np.components_.add( cmp );
+		}
+	}
+	return np;
+}
diff --git a/p-filesystem.hh b/p-filesystem.hh
index 9b9f133..83e35c4 100644
--- a/p-filesystem.hh
+++ b/p-filesystem.hh
@@ -268,6 +268,20 @@ inline bool T_FSPath::operator >=(
 	return compareTo( other ) >= 0;
 }
 
+/*----------------------------------------------------------------------------*/
+
+inline bool T_FSPath::isChildOf(
+		T_FSPath const& other ) const noexcept
+{
+	return other.isParentOf( *this );
+}
+
+inline bool T_FSPath::isUnder(
+		T_FSPath const& other ) const noexcept
+{
+	return other.isAbove( *this );
+}
+
 
 } // namespace ebcl
 #endif // _H_EBCL_FILESYSTEM