| Index: pkg/pathos/README.md
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| -A comprehensive, cross-platform path manipulation library for Dart.
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| -
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| -The pathos library provides common operations for manipulating file paths:
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| -joining, splitting, normalizing, etc.
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| -
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| -We've tried very hard to make this library do the "right" thing on whatever
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| -platform you run it on. When you use the top-level functions, it will assume the
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| -current platform's path style and work with that. If you want to specifically
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| -work with paths of a specific style, you can construct a `path.Builder` for that
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| -style.
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| -
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| -## Using
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| -
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| -The path library was designed to be imported with a prefix, though you don't
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| -have to if you don't want to:
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| -
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| - import 'package:pathos/path.dart' as path;
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| -
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| -## Top-level functions
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| -
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| -The most common way to use the library is through the top-level functions.
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| -These manipulate path strings based on your current working directory and the
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| -path style (POSIX, Windows, or URLs) of the host platform.
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| -
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| -### String get current
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| -
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| -Gets the path to the current working directory. In the browser, this means the
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| -current URL. When using dart2js, this currently returns `.` due to technical
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| -constraints. In the future, it will return the current URL.
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| -
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| -### String get separator
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| -
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| -Gets the path separator for the current platform. On Mac, Linux, and the
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| -browser, this is `/`. On Windows, it's `\`.
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| -
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| -### String absolute(String path)
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| -
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| -Converts [path] to an absolute path by resolving it relative to the current
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| -working directory. If [path] is already an absolute path, just returns it.
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| -
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| - path.absolute('foo/bar.txt'); // -> /your/current/dir/foo/bar.txt
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| -
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| -### String basename(String path)
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| -
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| -Gets the part of [path] after the last separator.
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| -
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| - path.basename('path/to/foo.dart'); // -> 'foo.dart'
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| - path.basename('path/to'); // -> 'to'
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| -
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| -Trailing separators are ignored.
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| -
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| - builder.basename('path/to/'); // -> 'to'
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| -
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| -### String basenameWithoutExtension(String path)
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| -
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| -Gets the part of [path] after the last separator, and without any trailing
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| -file extension.
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| -
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| - path.basenameWithoutExtension('path/to/foo.dart'); // -> 'foo'
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| -
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| -Trailing separators are ignored.
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| -
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| - builder.basenameWithoutExtension('path/to/foo.dart/'); // -> 'foo'
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| -
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| -### String dirname(String path)
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| -
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| -Gets the part of [path] before the last separator.
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| -
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| - path.dirname('path/to/foo.dart'); // -> 'path/to'
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| - path.dirname('path/to'); // -> 'to'
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| -
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| -Trailing separators are ignored.
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| -
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| - builder.dirname('path/to/'); // -> 'path'
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| -
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| -### String extension(String path)
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| -
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| -Gets the file extension of [path]: the portion of [basename] from the last
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| -`.` to the end (including the `.` itself).
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| -
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| - path.extension('path/to/foo.dart'); // -> '.dart'
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| - path.extension('path/to/foo'); // -> ''
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| - path.extension('path.to/foo'); // -> ''
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| - path.extension('path/to/foo.dart.js'); // -> '.js'
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| -
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| -If the file name starts with a `.`, then that is not considered the
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| -extension:
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| -
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| - path.extension('~/.bashrc'); // -> ''
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| - path.extension('~/.notes.txt'); // -> '.txt'
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| -
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| -### String rootPrefix(String path)
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| -
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| -Returns the root of [path], if it's absolute, or the empty string if it's
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| -relative.
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| -
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| - // Unix
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| - path.rootPrefix('path/to/foo'); // -> ''
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| - path.rootPrefix('/path/to/foo'); // -> '/'
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| -
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| - // Windows
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| - path.rootPrefix(r'path\to\foo'); // -> ''
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| - path.rootPrefix(r'C:\path\to\foo'); // -> r'C:\'
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| -
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| - // URL
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| - path.rootPrefix('path/to/foo'); // -> ''
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| - path.rootPrefix('http://dartlang.org/path/to/foo');
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| - // -> 'http://dartlang.org'
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| -
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| -### bool isAbsolute(String path)
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| -
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| -Returns `true` if [path] is an absolute path and `false` if it is a relative
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| -path. On POSIX systems, absolute paths start with a `/` (forward slash). On
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| -Windows, an absolute path starts with `\\`, or a drive letter followed by `:/`
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| -or `:\`. For URLs, absolute paths either start with a protocol and optional
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| -hostname (e.g. `http://dartlang.org`, `file://`) or with a `/`.
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| -
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| -URLs that start with `/` are known as "root-relative", since they're relative to
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| -the root of the current URL. Since root-relative paths are still absolute in
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| -every other sense, [isAbsolute] will return true for them. They can be detected
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| -using [isRootRelative].
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| -
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| -### bool isRelative(String path)
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| -
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| -Returns `true` if [path] is a relative path and `false` if it is absolute.
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| -On POSIX systems, absolute paths start with a `/` (forward slash). On
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| -Windows, an absolute path starts with `\\`, or a drive letter followed by
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| -`:/` or `:\`.
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| -
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| -### bool isRootRelative(String path)
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| -
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| -Returns `true` if [path] is a root-relative path and `false` if it's not. URLs
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| -that start with `/` are known as "root-relative", since they're relative to the
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| -root of the current URL. Since root-relative paths are still absolute in every
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| -other sense, [isAbsolute] will return true for them. They can be detected using
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| -[isRootRelative].
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| -
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| -No POSIX and Windows paths are root-relative.
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| -
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| -### String join(String part1, [String part2, String part3, ...])
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| -
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| -Joins the given path parts into a single path using the current platform's
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| -[separator]. Example:
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| -
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| - path.join('path', 'to', 'foo'); // -> 'path/to/foo'
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| -
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| -If any part ends in a path separator, then a redundant separator will not
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| -be added:
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| -
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| - path.join('path/', 'to', 'foo'); // -> 'path/to/foo
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| -
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| -If a part is an absolute path, then anything before that will be ignored:
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| -
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| - path.join('path', '/to', 'foo'); // -> '/to/foo'
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| -
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| -### List<String> split(String path)
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| -
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| -Splits [path] into its components using the current platform's [separator].
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| -
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| - path.split('path/to/foo'); // -> ['path', 'to', 'foo']
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| -
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| -The path will *not* be normalized before splitting.
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| -
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| - path.split('path/../foo'); // -> ['path', '..', 'foo']
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| -
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| -If [path] is absolute, the root directory will be the first element in the
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| -array. Example:
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| -
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| - // Unix
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| - path.split('/path/to/foo'); // -> ['/', 'path', 'to', 'foo']
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| -
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| - // Windows
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| - path.split(r'C:\path\to\foo'); // -> [r'C:\', 'path', 'to', 'foo']
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| -
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| - // Browser
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| - path.split('http://dartlang.org/path/to/foo');
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| - // -> ['http://dartlang.org', 'path', 'to', 'foo']
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| -
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| -### String normalize(String path)
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| -
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| -Normalizes [path], simplifying it by handling `..`, and `.`, and
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| -removing redundant path separators whenever possible.
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| -
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| - path.normalize('path/./to/..//file.text'); // -> 'path/file.txt'
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| -String normalize(String path) => _builder.normalize(path);
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| -
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| -### String relative(String path, {String from})
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| -
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| -Attempts to convert [path] to an equivalent relative path from the current
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| -directory.
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| -
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| - // Given current directory is /root/path:
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| - path.relative('/root/path/a/b.dart'); // -> 'a/b.dart'
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| - path.relative('/root/other.dart'); // -> '../other.dart'
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| -
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| -If the [from] argument is passed, [path] is made relative to that instead.
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| -
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| - path.relative('/root/path/a/b.dart',
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| - from: '/root/path'); // -> 'a/b.dart'
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| - path.relative('/root/other.dart',
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| - from: '/root/path'); // -> '../other.dart'
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| -
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| -Since there is no relative path from one drive letter to another on Windows,
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| -this will return an absolute path in that case.
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| -
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| - // Windows
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| - path.relative(r'D:\other', from: r'C:\home'); // -> 'D:\other'
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| -
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| - // URL
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| - path.relative('http://dartlang.org', from: 'http://pub.dartlang.org');
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| - // -> 'http://dartlang.org'
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| -
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| -### String withoutExtension(String path)
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| -
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| -Removes a trailing extension from the last part of [path].
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| -
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| - withoutExtension('path/to/foo.dart'); // -> 'path/to/foo'
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| -
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| -### String fromUri(Uri uri)
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| -
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| -Returns the path represented by [uri]. For POSIX and Windows styles, [uri] must
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| -be a `file:` URI. For the URL style, this will just convert [uri] to a string.
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| -
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| - // POSIX
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| - path.fromUri(Uri.parse('file:///path/to/foo'))
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| - // -> '/path/to/foo'
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| -
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| - // Windows
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| - path.fromUri(Uri.parse('file:///C:/path/to/foo'))
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| - // -> r'C:\path\to\foo'
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| -
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| - // URL
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| - path.fromUri(Uri.parse('http://dartlang.org/path/to/foo'))
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| - // -> 'http://dartlang.org/path/to/foo'
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| -
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| -### Uri toUri(String path)
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| -
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| -Returns the URI that represents [path]. For POSIX and Windows styles, this will
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| -return a `file:` URI. For the URL style, this will just convert [path] to a
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| -[Uri].
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| -
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| -This will always convert relative paths to absolute ones before converting
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| -to a URI.
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| -
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| - // POSIX
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| - path.toUri('/path/to/foo')
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| - // -> Uri.parse('file:///path/to/foo')
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| -
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| - // Windows
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| - path.toUri(r'C:\path\to\foo')
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| - // -> Uri.parse('file:///C:/path/to/foo')
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| -
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| - // URL
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| - path.toUri('http://dartlang.org/path/to/foo')
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| - // -> Uri.parse('http://dartlang.org/path/to/foo')
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| -
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| -## The path.Builder class
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| -
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| -In addition to the functions, path exposes a `path.Builder` class. This lets
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| -you configure the root directory and path style that paths are built using
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| -explicitly instead of assuming the current working directory and host OS's path
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| -style.
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| -
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| -You won't often use this, but it can be useful if you do a lot of path
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| -manipulation relative to some root directory.
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| -
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| - var builder = new path.Builder(root: '/other/root');
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| - builder.relative('/other/root/foo.txt'); // -> 'foo.txt'
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| -
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| -It exposes the same methods and getters as the top-level functions, with the
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| -addition of:
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| -
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| -### new Builder({Style style, String root})
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| -
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| -Creates a new path builder for the given style and root directory.
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| -
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| -If [style] is omitted, it uses the host operating system's path style. If
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| -[root] is omitted, it defaults to the current working directory. If [root]
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| -is relative, it is considered relative to the current working directory.
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| -
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| -### Style style
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| -
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| -The style of path that this builder works with.
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| -
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| -### String root
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| -
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| -The root directory that relative paths will be relative to.
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| -
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| -### String get separator
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| -
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| -Gets the path separator for the builder's [style]. On Mac and Linux,
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| -this is `/`. On Windows, it's `\`.
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| -
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| -### String rootPrefix(String path)
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| -
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| -Returns the root of [path], if it's absolute, or an empty string if it's
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| -relative.
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| -
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| - // Unix
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| - builder.rootPrefix('path/to/foo'); // -> ''
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| - builder.rootPrefix('/path/to/foo'); // -> '/'
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| -
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| - // Windows
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| - builder.rootPrefix(r'path\to\foo'); // -> ''
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| - builder.rootPrefix(r'C:\path\to\foo'); // -> r'C:\'
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| -
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| - // URL
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| - builder.rootPrefix('path/to/foo'); // -> ''
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| - builder.rootPrefix('http://dartlang.org/path/to/foo');
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| - // -> 'http://dartlang.org'
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| -
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| -### String resolve(String part1, [String part2, String part3, ...])
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| -
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| -Creates a new path by appending the given path parts to the [root].
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| -Equivalent to [join()] with [root] as the first argument. Example:
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| -
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| - var builder = new Builder(root: 'root');
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| - builder.resolve('path', 'to', 'foo'); // -> 'root/path/to/foo'
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| -
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| -## The path.Style class
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| -
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| -The path library can work with three different "flavors" of path: POSIX,
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| -Windows, and URLs. The differences between these are encapsulated by the
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| -`path.Style` enum class. There are three instances of it:
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| -
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| -### path.Style.posix
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| -
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| -POSIX-style paths use "/" (forward slash) as separators. Absolute paths
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| -start with "/". Used by UNIX, Linux, Mac OS X, and others.
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| -
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| -### path.Style.windows
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| -
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| -Windows paths use "\" (backslash) as separators. Absolute paths start with
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| -a drive letter followed by a colon (example, "C:") or two backslashes
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| -("\\") for UNC paths.
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| -
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| -### path.Style.url
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| -
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| -URLs aren't filesystem paths, but they're supported by Pathos to make it easier
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| -to manipulate URL paths in the browser.
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| -
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| -URLs use "/" (forward slash) as separators. Absolute paths either start with a
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| -protocol and optional hostname (e.g. `http://dartlang.org`, `file://`) or with
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| -"/".
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| -
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| -## FAQ
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| -
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| -### Where can I use this?
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| -
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| -Pathos runs on the Dart VM and in the browser under both dart2js and Dartium.
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| -Under dart2js, it currently returns "." as the current working directory, while
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| -under Dartium it returns the current URL.
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| -
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| -### Why doesn't this make paths first-class objects?
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| -
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| -When you have path *objects*, then every API that takes a path has to decide if
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| -it accepts strings, path objects, or both.
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| -
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| - * Accepting strings is the most convenient, but then it seems weird to have
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| - these path objects that aren't actually accepted by anything that needs a
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| - path. Once you've created a path, you have to always call `.toString()` on
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| - it before you can do anything useful with it.
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| -
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| - * Requiring objects forces users to wrap path strings in these objects, which
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| - is tedious. It also means coupling that API to whatever library defines this
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| - path class. If there are multiple "path" libraries that each define their
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| - own path types, then any library that works with paths has to pick which one
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| - it uses.
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| -
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| - * Taking both means you can't type your API. That defeats the purpose of
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| - having a path type: why have a type if your APIs can't annotate that they
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| - use it?
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| -
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| -Given that, we've decided this library should simply treat paths as strings.
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| -
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| -### How cross-platform is this?
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| -
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| -We believe this library handles most of the corner cases of Windows paths
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| -(POSIX paths are generally pretty straightforward):
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| -
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| - * It understands that *both* "/" and "\" are valid path separators, not just
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| - "\".
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| -
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| - * It can accurately tell if a path is absolute based on drive-letters or UNC
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| - prefix.
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| -
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| - * It understands that "/foo" is not an absolute path on Windows.
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| -
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| - * It knows that "C:\foo\one.txt" and "c:/foo\two.txt" are two files in the
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| - same directory.
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| -
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| -If you find a problem, surprise or something that's unclear, please don't
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| -hesitate to [file a bug](http://dartbug.com/new) and let us know.
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|