Use pub_semver package in pub.

sdk/lib/_internal/pub/lib/src/version.dart

Index: sdk/lib/_internal/pub/lib/src/version.dart
diff --git a/sdk/lib/_internal/pub/lib/src/version.dart b/sdk/lib/_internal/pub/lib/src/version.dart
deleted file mode 100644
index b68c3eda4a854ef7e4822f1b5336c195ed90353e..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/lib/src/version.dart
+++ /dev/null
@@ -1,592 +0,0 @@
-// Copyright (c) 2012, 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.
-
-/// Handles version numbers, following the [Semantic Versioning][semver] spec.
-///
-/// [semver]: http://semver.org/
-library pub.version;
-
-import 'dart:math';
-
-import 'package:collection/equality.dart';
-
-/// Regex that matches a version number at the beginning of a string.
-final _START_VERSION = new RegExp(
-    r'^'                                        // Start at beginning.
-    r'(\d+).(\d+).(\d+)'                        // Version number.
-    r'(-([0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*))?'    // Pre-release.
-    r'(\+([0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*))?'); // Build.
-
-/// Like [_START_VERSION] but matches the entire string.
-final _COMPLETE_VERSION = new RegExp("${_START_VERSION.pattern}\$");
-
-/// Parses a comparison operator ("<", ">", "<=", or ">=") at the beginning of
-/// a string.
-final _START_COMPARISON = new RegExp(r"^[<>]=?");
-
-/// The equality operator to use for comparing version components.
-final _equality = const IterableEquality();
-
-/// A parsed semantic version number.
-class Version implements Comparable<Version>, VersionConstraint {
-  /// No released version: i.e. "0.0.0".
-  static Version get none => new Version(0, 0, 0);
-
-  /// Compares [a] and [b] to see which takes priority over the other.
-  ///
-  /// Returns `1` if [a] takes priority over [b] and `-1` if vice versa. If
-  /// [a] and [b] are equivalent, returns `0`.
-  ///
-  /// Unlike [compareTo], which *orders* versions, this determines which
-  /// version a user is likely to prefer. In particular, it prioritizes
-  /// pre-release versions lower than stable versions, regardless of their
-  /// version numbers.
-  ///
-  /// When used to sort a list, orders in ascending priority so that the
-  /// highest priority version is *last* in the result.
-  static int prioritize(Version a, Version b) {
-    // Sort all prerelease versions after all normal versions. This way
-    // the solver will prefer stable packages over unstable ones.
-    if (a.isPreRelease && !b.isPreRelease) return -1;
-    if (!a.isPreRelease && b.isPreRelease) return 1;
-
-    return a.compareTo(b);
-  }
-
-  /// Like [proiritize], but lower version numbers are considered greater than
-  /// higher version numbers.
-  ///
-  /// This still considers prerelease versions to be lower than non-prerelease
-  /// versions.
-  static int antiPrioritize(Version a, Version b) {
-    if (a.isPreRelease && !b.isPreRelease) return -1;
-    if (!a.isPreRelease && b.isPreRelease) return 1;
-
-    return b.compareTo(a);
-  }
-
-  /// The major version number: "1" in "1.2.3".
-  final int major;
-
-  /// The minor version number: "2" in "1.2.3".
-  final int minor;
-
-  /// The patch version number: "3" in "1.2.3".
-  final int patch;
-
-  /// The pre-release identifier: "foo" in "1.2.3-foo".
-  ///
-  /// This is split into a list of components, each of which may be either a
-  /// string or a non-negative integer. It may also be empty, indicating that
-  /// this version has no pre-release identifier.
-  final List preRelease;
-
-  /// The build identifier: "foo" in "1.2.3+foo".
-  ///
-  /// This is split into a list of components, each of which may be either a
-  /// string or a non-negative integer. It may also be empty, indicating that
-  /// this version has no build identifier.
-  final List build;
-
-  /// The original string representation of the version number.
-  ///
-  /// This preserves textual artifacts like leading zeros that may be left out
-  /// of the parsed version.
-  final String _text;
-
-  Version._(this.major, this.minor, this.patch, String preRelease, String build,
-            this._text)
-      : preRelease = preRelease == null ? [] : _splitParts(preRelease),
-        build = build == null ? [] : _splitParts(build) {
-    if (major < 0) throw new ArgumentError(
-        'Major version must be non-negative.');
-    if (minor < 0) throw new ArgumentError(
-        'Minor version must be non-negative.');
-    if (patch < 0) throw new ArgumentError(
-        'Patch version must be non-negative.');
-  }
-
-  /// Creates a new [Version] object.
-  factory Version(int major, int minor, int patch, {String pre, String build}) {
-    var text = "$major.$minor.$patch";
-    if (pre != null) text += "-$pre";
-    if (build != null) text += "+$build";
-
-    return new Version._(major, minor, patch, pre, build, text);
-  }
-
-  /// Creates a new [Version] by parsing [text].
-  factory Version.parse(String text) {
-    final match = _COMPLETE_VERSION.firstMatch(text);
-    if (match == null) {
-      throw new FormatException('Could not parse "$text".');
-    }
-
-    try {
-      int major = int.parse(match[1]);
-      int minor = int.parse(match[2]);
-      int patch = int.parse(match[3]);
-
-      String preRelease = match[5];
-      String build = match[8];
-
-      return new Version._(major, minor, patch, preRelease, build, text);
-    } on FormatException catch (ex) {
-      throw new FormatException('Could not parse "$text".');
-    }
-  }
-
-  /// Returns the primary version out of a list of candidates.
-  ///
-  /// This is the highest-numbered stable (non-prerelease) version. If there
-  /// are no stable versions, it's just the highest-numbered version.
-  static Version primary(List<Version> versions) {
-    var primary;
-    for (var version in versions) {
-      if (primary == null || (!version.isPreRelease && primary.isPreRelease) ||
-          (version.isPreRelease == primary.isPreRelease && version > primary)) {
-        primary = version;
-      }
-    }
-    return primary;
-  }
-
-  /// Splits a string of dot-delimited identifiers into their component parts.
-  ///
-  /// Identifiers that are numeric are converted to numbers.
-  static List _splitParts(String text) {
-    return text.split('.').map((part) {
-      try {
-        return int.parse(part);
-      } on FormatException catch (ex) {
-        // Not a number.
-        return part;
-      }
-    }).toList();
-  }
-
-  bool operator ==(other) {
-    if (other is! Version) return false;
-    return major == other.major && minor == other.minor &&
-        patch == other.patch &&
-        _equality.equals(preRelease, other.preRelease) &&
-        _equality.equals(build, other.build);
-  }
-
-  int get hashCode => major ^ minor ^ patch ^ _equality.hash(preRelease) ^
-      _equality.hash(build);
-
-  bool operator <(Version other) => compareTo(other) < 0;
-  bool operator >(Version other) => compareTo(other) > 0;
-  bool operator <=(Version other) => compareTo(other) <= 0;
-  bool operator >=(Version other) => compareTo(other) >= 0;
-
-  bool get isAny => false;
-  bool get isEmpty => false;
-
-  /// Whether or not this is a pre-release version.
-  bool get isPreRelease => preRelease.isNotEmpty;
-
-  /// Gets the next major version number that follows this one.
-  ///
-  /// If this version is a pre-release of a major version release (i.e. the
-  /// minor and patch versions are zero), then it just strips the pre-release
-  /// suffix. Otherwise, it increments the major version and resets the minor
-  /// and patch.
-  Version get nextMajor {
-    if (isPreRelease && minor == 0 && patch == 0) {
-      return new Version(major, minor, patch);
-    }
-
-    return new Version(major + 1, 0, 0);
-  }
-
-  /// Gets the next minor version number that follows this one.
-  ///
-  /// If this version is a pre-release of a minor version release (i.e. the
-  /// patch version is zero), then it just strips the pre-release suffix.
-  /// Otherwise, it increments the minor version and resets the patch.
-  Version get nextMinor {
-    if (isPreRelease && patch == 0) {
-      return new Version(major, minor, patch);
-    }
-
-    return new Version(major, minor + 1, 0);
-  }
-
-  /// Gets the next patch version number that follows this one.
-  ///
-  /// If this version is a pre-release, then it just strips the pre-release
-  /// suffix. Otherwise, it increments the patch version.
-  Version get nextPatch {
-    if (isPreRelease) {
-      return new Version(major, minor, patch);
-    }
-
-    return new Version(major, minor, patch + 1);
-  }
-
-  /// Tests if [other] matches this version exactly.
-  bool allows(Version other) => this == other;
-
-  VersionConstraint intersect(VersionConstraint other) {
-    if (other.isEmpty) return other;
-
-    // Intersect a version and a range.
-    if (other is VersionRange) return other.intersect(this);
-
-    // Intersecting two versions only works if they are the same.
-    if (other is Version) {
-      return this == other ? this : VersionConstraint.empty;
-    }
-
-    throw new ArgumentError(
-        'Unknown VersionConstraint type $other.');
-  }
-
-  int compareTo(Version other) {
-    if (major != other.major) return major.compareTo(other.major);
-    if (minor != other.minor) return minor.compareTo(other.minor);
-    if (patch != other.patch) return patch.compareTo(other.patch);
-
-    // Pre-releases always come before no pre-release string.
-    if (!isPreRelease && other.isPreRelease) return 1;
-    if (!other.isPreRelease && isPreRelease) return -1;
-
-    var comparison = _compareLists(preRelease, other.preRelease);
-    if (comparison != 0) return comparison;
-
-    // Builds always come after no build string.
-    if (build.isEmpty && other.build.isNotEmpty) return -1;
-    if (other.build.isEmpty && build.isNotEmpty) return 1;
-    return _compareLists(build, other.build);
-  }
-
-  String toString() => _text;
-
-  /// Compares a dot-separated component of two versions.
-  ///
-  /// This is used for the pre-release and build version parts. This follows
-  /// Rule 12 of the Semantic Versioning spec (v2.0.0-rc.1).
-  int _compareLists(List a, List b) {
-    for (var i = 0; i < max(a.length, b.length); i++) {
-      var aPart = (i < a.length) ? a[i] : null;
-      var bPart = (i < b.length) ? b[i] : null;
-
-      if (aPart == bPart) continue;
-
-      // Missing parts come before present ones.
-      if (aPart == null) return -1;
-      if (bPart == null) return 1;
-
-      if (aPart is num) {
-        if (bPart is num) {
-          // Compare two numbers.
-          return aPart.compareTo(bPart);
-        } else {
-          // Numbers come before strings.
-          return -1;
-        }
-      } else {
-        if (bPart is num) {
-          // Strings come after numbers.
-          return 1;
-        } else {
-          // Compare two strings.
-          return aPart.compareTo(bPart);
-        }
-      }
-    }
-
-    // The lists are entirely equal.
-    return 0;
-  }
-}
-
-/// A [VersionConstraint] is a predicate that can determine whether a given
-/// version is valid or not.
-///
-/// For example, a ">= 2.0.0" constraint allows any version that is "2.0.0" or
-/// greater. Version objects themselves implement this to match a specific
-/// version.
-abstract class VersionConstraint {
-  /// A [VersionConstraint] that allows all versions.
-  static VersionConstraint any = new VersionRange();
-
-  /// A [VersionConstraint] that allows no versions: i.e. the empty set.
-  static VersionConstraint empty = const _EmptyVersion();
-
-  /// Parses a version constraint.
-  ///
-  /// This string is either "any" or a series of version parts. Each part can
-  /// be one of:
-  ///
-  ///   * A version string like `1.2.3`. In other words, anything that can be
-  ///     parsed by [Version.parse()].
-  ///   * A comparison operator (`<`, `>`, `<=`, or `>=`) followed by a version
-  ///     string.
-  ///
-  /// Whitespace is ignored.
-  ///
-  /// Examples:
-  ///
-  ///     any
-  ///     1.2.3-alpha
-  ///     <=5.1.4
-  ///     >2.0.4 <= 2.4.6
-  factory VersionConstraint.parse(String text) {
-    // Handle the "any" constraint.
-    if (text.trim() == "any") return new VersionRange();
-
-    var originalText = text;
-    var constraints = <VersionConstraint>[];
-
-    void skipWhitespace() {
-      text = text.trim();
-    }
-
-    // Try to parse and consume a version number.
-    Version matchVersion() {
-      var version = _START_VERSION.firstMatch(text);
-      if (version == null) return null;
-
-      text = text.substring(version.end);
-      return new Version.parse(version[0]);
-    }
-
-    // Try to parse and consume a comparison operator followed by a version.
-    VersionConstraint matchComparison() {
-      var comparison = _START_COMPARISON.firstMatch(text);
-      if (comparison == null) return null;
-
-      var op = comparison[0];
-      text = text.substring(comparison.end);
-      skipWhitespace();
-
-      var version = matchVersion();
-      if (version == null) {
-        throw new FormatException('Expected version number after "$op" in '
-            '"$originalText", got "$text".');
-      }
-
-      switch (op) {
-        case '<=':
-          return new VersionRange(max: version, includeMax: true);
-        case '<':
-          return new VersionRange(max: version, includeMax: false);
-        case '>=':
-          return new VersionRange(min: version, includeMin: true);
-        case '>':
-          return new VersionRange(min: version, includeMin: false);
-      }
-      throw "Unreachable.";
-    }
-
-    while (true) {
-      skipWhitespace();
-      if (text.isEmpty) break;
-
-      var version = matchVersion();
-      if (version != null) {
-        constraints.add(version);
-        continue;
-      }
-
-      var comparison = matchComparison();
-      if (comparison != null) {
-        constraints.add(comparison);
-        continue;
-      }
-
-      // If we got here, we couldn't parse the remaining string.
-      throw new FormatException('Could not parse version "$originalText". '
-          'Unknown text at "$text".');
-    }
-
-    if (constraints.isEmpty) {
-      throw new FormatException('Cannot parse an empty string.');
-    }
-
-    return new VersionConstraint.intersection(constraints);
-  }
-
-  /// Creates a new version constraint that is the intersection of
-  /// [constraints].
-  ///
-  /// It only allows versions that all of those constraints allow. If
-  /// constraints is empty, then it returns a VersionConstraint that allows
-  /// all versions.
-  factory VersionConstraint.intersection(
-      Iterable<VersionConstraint> constraints) {
-    var constraint = new VersionRange();
-    for (var other in constraints) {
-      constraint = constraint.intersect(other);
-    }
-    return constraint;
-  }
-
-  /// Returns `true` if this constraint allows no versions.
-  bool get isEmpty;
-
-  /// Returns `true` if this constraint allows all versions.
-  bool get isAny;
-
-  /// Returns `true` if this constraint allows [version].
-  bool allows(Version version);
-
-  /// Creates a new [VersionConstraint] that only allows [Version]s allowed by
-  /// both this and [other].
-  VersionConstraint intersect(VersionConstraint other);
-}
-
-/// Constrains versions to a fall within a given range.
-///
-/// If there is a minimum, then this only allows versions that are at that
-/// minimum or greater. If there is a maximum, then only versions less than
-/// that are allowed. In other words, this allows `>= min, < max`.
-class VersionRange implements VersionConstraint {
-  final Version min;
-  final Version max;
-  final bool includeMin;
-  final bool includeMax;
-
-  VersionRange({this.min, this.max,
-      this.includeMin: false, this.includeMax: false}) {
-    if (min != null && max != null && min > max) {
-      throw new ArgumentError(
-          'Minimum version ("$min") must be less than maximum ("$max").');
-    }
-  }
-
-  bool operator ==(other) {
-    if (other is! VersionRange) return false;
-
-    return min == other.min &&
-           max == other.max &&
-           includeMin == other.includeMin &&
-           includeMax == other.includeMax;
-  }
-
-  bool get isEmpty => false;
-
-  bool get isAny => min == null && max == null;
-
-  /// Tests if [other] matches falls within this version range.
-  bool allows(Version other) {
-    if (min != null) {
-      if (other < min) return false;
-      if (!includeMin && other == min) return false;
-    }
-
-    if (max != null) {
-      if (other > max) return false;
-      if (!includeMax && other == max) return false;
-
-      // If the max isn't itself a pre-release, don't allow any pre-release
-      // versions of the max.
-      //
-      // See: https://www.npmjs.org/doc/misc/semver.html
-      if (!includeMax &&
-          !max.isPreRelease && other.isPreRelease &&
-          other.major == max.major && other.minor == max.minor &&
-          other.patch == max.patch) {
-        return false;
-      }
-    }
-
-    return true;
-  }
-
-  VersionConstraint intersect(VersionConstraint other) {
-    if (other.isEmpty) return other;
-
-    // A range and a Version just yields the version if it's in the range.
-    if (other is Version) {
-      return allows(other) ? other : VersionConstraint.empty;
-    }
-
-    if (other is VersionRange) {
-      // Intersect the two ranges.
-      var intersectMin = min;
-      var intersectIncludeMin = includeMin;
-      var intersectMax = max;
-      var intersectIncludeMax = includeMax;
-
-      if (other.min == null) {
-        // Do nothing.
-      } else if (intersectMin == null || intersectMin < other.min) {
-        intersectMin = other.min;
-        intersectIncludeMin = other.includeMin;
-      } else if (intersectMin == other.min && !other.includeMin) {
-        // The edges are the same, but one is exclusive, make it exclusive.
-        intersectIncludeMin = false;
-      }
-
-      if (other.max == null) {
-        // Do nothing.
-      } else if (intersectMax == null || intersectMax > other.max) {
-        intersectMax = other.max;
-        intersectIncludeMax = other.includeMax;
-      } else if (intersectMax == other.max && !other.includeMax) {
-        // The edges are the same, but one is exclusive, make it exclusive.
-        intersectIncludeMax = false;
-      }
-
-      if (intersectMin == null && intersectMax == null) {
-        // Open range.
-        return new VersionRange();
-      }
-
-      // If the range is just a single version.
-      if (intersectMin == intersectMax) {
-        // If both ends are inclusive, allow that version.
-        if (intersectIncludeMin && intersectIncludeMax) return intersectMin;
-
-        // Otherwise, no versions.
-        return VersionConstraint.empty;
-      }
-
-      if (intersectMin != null && intersectMax != null &&
-          intersectMin > intersectMax) {
-        // Non-overlapping ranges, so empty.
-        return VersionConstraint.empty;
-      }
-
-      // If we got here, there is an actual range.
-      return new VersionRange(min: intersectMin, max: intersectMax,
-          includeMin: intersectIncludeMin, includeMax: intersectIncludeMax);
-    }
-
-    throw new ArgumentError(
-        'Unknown VersionConstraint type $other.');
-  }
-
-  String toString() {
-    var buffer = new StringBuffer();
-
-    if (min != null) {
-      buffer.write(includeMin ? '>=' : '>');
-      buffer.write(min);
-    }
-
-    if (max != null) {
-      if (min != null) buffer.write(' ');
-      buffer.write(includeMax ? '<=' : '<');
-      buffer.write(max);
-    }
-
-    if (min == null && max == null) buffer.write('any');
-    return buffer.toString();
-  }
-}
-
-class _EmptyVersion implements VersionConstraint {
-  const _EmptyVersion();
-
-  bool get isEmpty => true;
-  bool get isAny => false;
-  bool allows(Version other) => false;
-  VersionConstraint intersect(VersionConstraint other) => this;
-  String toString() => '<empty>';
-}