| // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library glob.ast; |
| |
| import 'package:path/path.dart' as p; |
| |
| import 'utils.dart'; |
| |
| const _SEPARATOR = 0x2F; // "/" |
| |
| /// A node in the abstract syntax tree for a glob. |
| abstract class AstNode { |
| /// The cached regular expression that this AST was compiled into. |
| RegExp _regExp; |
| |
| /// Whether this glob could match an absolute path. |
| /// |
| /// Either this or [canMatchRelative] or both will be true. |
| final bool canMatchAbsolute = false; |
| |
| /// Whether this glob could match a relative path. |
| /// |
| /// Either this or [canMatchRelative] or both will be true. |
| final bool canMatchRelative = true; |
| |
| /// Returns whether this glob matches [string]. |
| bool matches(String string) { |
| if (_regExp == null) _regExp = new RegExp('^${_toRegExp()}\$'); |
| return _regExp.hasMatch(string); |
| } |
| |
| /// Subclasses should override this to return a regular expression component. |
| String _toRegExp(); |
| } |
| |
| /// A sequence of adjacent AST nodes. |
| class SequenceNode extends AstNode { |
| /// The nodes in the sequence. |
| final List<AstNode> nodes; |
| |
| bool get canMatchAbsolute => nodes.first.canMatchAbsolute; |
| bool get canMatchRelative => nodes.first.canMatchRelative; |
| |
| SequenceNode(Iterable<AstNode> nodes) |
| : nodes = nodes.toList(); |
| |
| String _toRegExp() => nodes.map((node) => node._toRegExp()).join(); |
| |
| String toString() => nodes.join(); |
| } |
| |
| /// A node matching zero or more non-separator characters. |
| class StarNode extends AstNode { |
| StarNode(); |
| |
| String _toRegExp() => '[^/]*'; |
| |
| String toString() => '*'; |
| } |
| |
| /// A node matching zero or more characters that may be separators. |
| class DoubleStarNode extends AstNode { |
| /// The path context for the glob. |
| /// |
| /// This is used to determine what absolute paths look like. |
| final p.Context _context; |
| |
| DoubleStarNode(this._context); |
| |
| String _toRegExp() { |
| // Double star shouldn't match paths with a leading "../", since these paths |
| // wouldn't be listed with this glob. We only check for "../" at the |
| // beginning since the paths are normalized before being checked against the |
| // glob. |
| var buffer = new StringBuffer()..write(r'(?!^(?:\.\./|'); |
| |
| // A double star at the beginning of the glob also shouldn't match absolute |
| // paths, since those also wouldn't be listed. Which root patterns we look |
| // for depends on the style of path we're matching. |
| if (_context.style == p.Style.posix) { |
| buffer.write(r'/'); |
| } else if (_context.style == p.Style.windows) { |
| buffer.write(r'//|[A-Za-z]:/'); |
| } else { |
| assert(_context.style == p.Style.url); |
| buffer.write(r'[a-zA-Z][-+.a-zA-Z\d]*://|/'); |
| } |
| |
| // Use `[^]` rather than `.` so that it matches newlines as well. |
| buffer.write(r'))[^]*'); |
| |
| return buffer.toString(); |
| } |
| |
| String toString() => '**'; |
| } |
| |
| /// A node matching a single non-separator character. |
| class AnyCharNode extends AstNode { |
| AnyCharNode(); |
| |
| String _toRegExp() => '[^/]'; |
| |
| String toString() => '?'; |
| } |
| |
| /// A node matching a single character in a range of options. |
| class RangeNode extends AstNode { |
| /// The ranges matched by this node. |
| /// |
| /// The ends of the ranges are unicode code points. |
| final Set<Range> ranges; |
| |
| /// Whether this range was negated. |
| final bool negated; |
| |
| RangeNode(Iterable<Range> ranges, {this.negated}) |
| : ranges = ranges.toSet(); |
| |
| String _toRegExp() { |
| var buffer = new StringBuffer(); |
| |
| var containsSeparator = ranges.any((range) => range.contains(_SEPARATOR)); |
| if (!negated && containsSeparator) { |
| // Add `(?!/)` because ranges are never allowed to match separators. |
| buffer.write('(?!/)'); |
| } |
| |
| buffer.write('['); |
| if (negated) { |
| buffer.write('^'); |
| // If the range doesn't itself exclude separators, exclude them ourselves, |
| // since ranges are never allowed to match them. |
| if (!containsSeparator) buffer.write('/'); |
| } |
| |
| for (var range in ranges) { |
| var start = new String.fromCharCodes([range.min]); |
| buffer.write(regExpQuote(start)); |
| if (range.isSingleton) continue; |
| buffer.write('-'); |
| buffer.write(regExpQuote(new String.fromCharCodes([range.max]))); |
| } |
| |
| buffer.write(']'); |
| return buffer.toString(); |
| } |
| |
| String toString() { |
| var buffer = new StringBuffer()..write('['); |
| for (var range in ranges) { |
| buffer.writeCharCode(range.min); |
| if (range.isSingleton) continue; |
| buffer.write('-'); |
| buffer.writeCharCode(range.max); |
| } |
| buffer.write(']'); |
| return buffer.toString(); |
| } |
| } |
| |
| /// A node that matches one of several options. |
| class OptionsNode extends AstNode { |
| /// The options to match. |
| final List<SequenceNode> options; |
| |
| bool get canMatchAbsolute => options.any((node) => node.canMatchAbsolute); |
| bool get canMatchRelative => options.any((node) => node.canMatchRelative); |
| |
| OptionsNode(Iterable<SequenceNode> options) |
| : options = options.toList(); |
| |
| String _toRegExp() => |
| '(?:${options.map((option) => option._toRegExp()).join("|")})'; |
| |
| String toString() => '{${options.join(',')}}'; |
| } |
| |
| /// A node that matches a literal string. |
| class LiteralNode extends AstNode { |
| /// The string to match. |
| final String text; |
| |
| /// The path context for the glob. |
| /// |
| /// This is used to determine whether this could match an absolute path. |
| final p.Context _context; |
| |
| bool get canMatchAbsolute { |
| var nativeText = _context.style == p.Style.windows ? |
| text.replaceAll('/', '\\') : text; |
| return _context.isAbsolute(nativeText); |
| } |
| |
| bool get canMatchRelative => !canMatchAbsolute; |
| |
| LiteralNode(this.text, this._context); |
| |
| String _toRegExp() => regExpQuote(text); |
| |
| String toString() => text; |
| } |