LCOV - code coverage report
Current view: top level - path-1.4.2/lib/src - parsed_path.dart (source / functions) Hit Total Coverage
Test: coverage.lcov Lines: 43 68 63.2 %
Date: 2017-10-10 20:17:03 Functions: 0 0 -

          Line data    Source code
       1             : // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
       2             : // for details. All rights reserved. Use of this source code is governed by a
       3             : // BSD-style license that can be found in the LICENSE file.
       4             : 
       5             : import 'internal_style.dart';
       6             : import 'style.dart';
       7             : 
       8             : class ParsedPath {
       9             :   /// The [InternalStyle] that was used to parse this path.
      10             :   InternalStyle style;
      11             : 
      12             :   /// The absolute root portion of the path, or `null` if the path is relative.
      13             :   /// On POSIX systems, this will be `null` or "/". On Windows, it can be
      14             :   /// `null`, "//" for a UNC path, or something like "C:\" for paths with drive
      15             :   /// letters.
      16             :   String root;
      17             : 
      18             :   /// Whether this path is root-relative.
      19             :   ///
      20             :   /// See [Context.isRootRelative].
      21             :   bool isRootRelative;
      22             : 
      23             :   /// The path-separated parts of the path. All but the last will be
      24             :   /// directories.
      25             :   List<String> parts;
      26             : 
      27             :   /// The path separators preceding each part.
      28             :   ///
      29             :   /// The first one will be an empty string unless the root requires a separator
      30             :   /// between it and the path. The last one will be an empty string unless the
      31             :   /// path ends with a trailing separator.
      32             :   List<String> separators;
      33             : 
      34             :   /// The file extension of the last non-empty part, or "" if it doesn't have
      35             :   /// one.
      36           0 :   String get extension => _splitExtension()[1];
      37             : 
      38             :   /// `true` if this is an absolute path.
      39           5 :   bool get isAbsolute => root != null;
      40             : 
      41             :   factory ParsedPath.parse(String path, InternalStyle style) {
      42             :     // Remove the root prefix, if any.
      43           5 :     var root = style.getRoot(path);
      44           5 :     var isRootRelative = style.isRootRelative(path);
      45          10 :     if (root != null) path = path.substring(root.length);
      46             : 
      47             :     // Split the parts on path separators.
      48           5 :     var parts = <String>[];
      49           5 :     var separators = <String>[];
      50             : 
      51             :     var start = 0;
      52             : 
      53          15 :     if (path.isNotEmpty && style.isSeparator(path.codeUnitAt(0))) {
      54           0 :       separators.add(path[0]);
      55             :       start = 1;
      56             :     } else {
      57           5 :       separators.add('');
      58             :     }
      59             : 
      60          15 :     for (var i = start; i < path.length; i++) {
      61          10 :       if (style.isSeparator(path.codeUnitAt(i))) {
      62          10 :         parts.add(path.substring(start, i));
      63          10 :         separators.add(path[i]);
      64           5 :         start = i + 1;
      65             :       }
      66             :     }
      67             : 
      68             :     // Add the final part, if any.
      69          10 :     if (start < path.length) {
      70          10 :       parts.add(path.substring(start));
      71           5 :       separators.add('');
      72             :     }
      73             : 
      74           5 :     return new ParsedPath._(style, root, isRootRelative, parts, separators);
      75             :   }
      76             : 
      77             :   ParsedPath._(
      78           5 :       this.style, this.root, this.isRootRelative, this.parts, this.separators);
      79             : 
      80             :   String get basename {
      81           0 :     var copy = this.clone();
      82           0 :     copy.removeTrailingSeparators();
      83           0 :     if (copy.parts.isEmpty) return root == null ? '' : root;
      84           0 :     return copy.parts.last;
      85             :   }
      86             : 
      87           0 :   String get basenameWithoutExtension => _splitExtension()[0];
      88             : 
      89             :   bool get hasTrailingSeparator =>
      90           0 :       !parts.isEmpty && (parts.last == '' || separators.last != '');
      91             : 
      92             :   void removeTrailingSeparators() {
      93          25 :     while (!parts.isEmpty && parts.last == '') {
      94           0 :       parts.removeLast();
      95           0 :       separators.removeLast();
      96             :     }
      97          40 :     if (separators.length > 0) separators[separators.length - 1] = '';
      98             :   }
      99             : 
     100             :   void normalize({bool canonicalize: false}) {
     101             :     // Handle '.', '..', and empty parts.
     102             :     var leadingDoubles = 0;
     103           5 :     var newParts = <String>[];
     104          10 :     for (var part in parts) {
     105          10 :       if (part == '.' || part == '') {
     106             :         // Do nothing. Ignore it.
     107           5 :       } else if (part == '..') {
     108             :         // Pop the last part off.
     109           0 :         if (newParts.length > 0) {
     110           0 :           newParts.removeLast();
     111             :         } else {
     112             :           // Backed out past the beginning, so preserve the "..".
     113           0 :           leadingDoubles++;
     114             :         }
     115             :       } else {
     116           5 :         newParts.add(canonicalize ? style.canonicalizePart(part) : part);
     117             :       }
     118             :     }
     119             : 
     120             :     // A relative path can back out from the start directory.
     121           5 :     if (!isAbsolute) {
     122           0 :       newParts.insertAll(0, new List.filled(leadingDoubles, '..'));
     123             :     }
     124             : 
     125             :     // If we collapsed down to nothing, do ".".
     126          10 :     if (newParts.length == 0 && !isAbsolute) {
     127           0 :       newParts.add('.');
     128             :     }
     129             : 
     130             :     // Canonicalize separators.
     131           5 :     var newSeparators = new List<String>.generate(
     132          15 :         newParts.length, (_) => style.separator, growable: true);
     133          10 :     newSeparators.insert(0, isAbsolute &&
     134          10 :         newParts.length > 0 &&
     135          15 :         style.needsSeparator(root) ? style.separator : '');
     136             : 
     137           5 :     parts = newParts;
     138           5 :     separators = newSeparators;
     139             : 
     140             :     // Normalize the Windows root if needed.
     141          20 :     if (root != null && style == Style.windows) {
     142           0 :       if (canonicalize) root = root.toLowerCase();
     143           0 :       root = root.replaceAll('/', '\\');
     144             :     }
     145           5 :     removeTrailingSeparators();
     146             :   }
     147             : 
     148             :   String toString() {
     149           5 :     var builder = new StringBuffer();
     150          15 :     if (root != null) builder.write(root);
     151          20 :     for (var i = 0; i < parts.length; i++) {
     152          15 :       builder.write(separators[i]);
     153          15 :       builder.write(parts[i]);
     154             :     }
     155          15 :     builder.write(separators.last);
     156             : 
     157           5 :     return builder.toString();
     158             :   }
     159             : 
     160             :   /// Splits the last non-empty part of the path into a `[basename, extension`]
     161             :   /// pair.
     162             :   ///
     163             :   /// Returns a two-element list. The first is the name of the file without any
     164             :   /// extension. The second is the extension or "" if it has none.
     165             :   List<String> _splitExtension() {
     166           0 :     var file = parts.lastWhere((p) => p != '', orElse: () => null);
     167             : 
     168           0 :     if (file == null) return ['', ''];
     169           0 :     if (file == '..') return ['..', ''];
     170             : 
     171           0 :     var lastDot = file.lastIndexOf('.');
     172             : 
     173             :     // If there is no dot, or it's the first character, like '.bashrc', it
     174             :     // doesn't count.
     175           0 :     if (lastDot <= 0) return [file, ''];
     176             : 
     177           0 :     return [file.substring(0, lastDot), file.substring(lastDot)];
     178             :   }
     179             : 
     180           0 :   ParsedPath clone() => new ParsedPath._(style, root, isRootRelative,
     181           0 :       new List.from(parts), new List.from(separators));
     182             : }

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