class Bundler::PubGrub::BasicPackageSource

Example classes: String (“~> 1.0”), Gem::Requirement
It must also have a reasonable definition of #==
parse_dependency to convert it to a format Bundler::PubGrub understands.
returned by dependencies_for(package, version) and will be passed to
This class represents the requirement one package has on another. It is
## “Dependency”
Example classes: Gem::Version, Integer
It must be Comparible (and implement <=> reasonably)
only be compared against other versions of the same package.
Versions don’t need to store their associated package, however they will
This class will be used to represent a single version number.
## “Version”:
Example classes: String (“rails”)
It must also have a reasonable definition of #== and #hash
probably return the package’s name.
.to_s will be called when displaying errors and debugging info, it should
This class will be used to represent the various packages being solved for.
## “Package”:
Where possible, Bundler::PubGrub will accept user-defined types, so long as they quack.
Types:

def all_versions_for(package)

Returns: Array of versions for a package, in preferred order of selection

It is called at most once per-package

This is called per package to find all possible versions of a package.

Override me!

def all_versions_for(package)
  raise NotImplementedError
end

def dependencies_for(package, version)

Returns: Hash in the form of { package => requirement, ... }

Override me!

def dependencies_for(package, version)
  raise NotImplementedError
end

def incompatibilities_for(package, version)

def incompatibilities_for(package, version)
  package_deps = @cached_dependencies[package]
  sorted_versions = @sorted_versions[package]
  package_deps[version].map do |dep_package, dep_constraint_name|
    low = high = sorted_versions.index(version)
    # find version low such that all >= low share the same dep
    while low > 0 &&
        package_deps[sorted_versions[low - 1]][dep_package] == dep_constraint_name
      low -= 1
    end
    low =
      if low == 0
        nil
      else
        sorted_versions[low]
      end
    # find version high such that all < high share the same dep
    while high < sorted_versions.length &&
        package_deps[sorted_versions[high]][dep_package] == dep_constraint_name
      high += 1
    end
    high =
      if high == sorted_versions.length
        nil
      else
        sorted_versions[high]
      end
    range = VersionRange.new(min: low, max: high, include_min: true)
    self_constraint = VersionConstraint.new(package, range: range)
    if !@packages.include?(dep_package)
      # no such package -> this version is invalid
    end
    dep_constraint = parse_dependency(dep_package, dep_constraint_name)
    if !dep_constraint
      # falsey indicates this dependency was invalid
      cause = Bundler::PubGrub::Incompatibility::InvalidDependency.new(dep_package, dep_constraint_name)
      return [Incompatibility.new([Term.new(self_constraint, true)], cause: cause)]
    elsif !dep_constraint.is_a?(VersionConstraint)
      # Upgrade range/union to VersionConstraint
      dep_constraint = VersionConstraint.new(dep_package, range: dep_constraint)
    end
    Incompatibility.new([Term.new(self_constraint, true), Term.new(dep_constraint, false)], cause: :dependency)
  end
end

def initialize

def initialize
  @root_package = Package.root
  @root_version = Package.root_version
  @cached_versions = Hash.new do |h,k|
    if k == @root_package
      h[k] = [@root_version]
    else
      h[k] = all_versions_for(k)
    end
  end
  @sorted_versions = Hash.new { |h,k| h[k] = @cached_versions[k].sort }
  @version_indexes = Hash.new { |h,k| h[k] = @cached_versions[k].each.with_index.to_h }
  @cached_dependencies = Hash.new do |packages, package|
    if package == @root_package
      packages[package] = {
        @root_version => root_dependencies
      }
    else
      packages[package] = Hash.new do |versions, version|
        versions[version] = dependencies_for(package, version)
      end
    end
  end
end

def no_versions_incompatibility_for(_package, unsatisfied_term)

def no_versions_incompatibility_for(_package, unsatisfied_term)
  cause = Incompatibility::NoVersions.new(unsatisfied_term)
  Incompatibility.new([unsatisfied_term], cause: cause)
end

def parse_dependency(package, dependency)

Bundler::PubGrub::VersionConstraint
Returns: either a Bundler::PubGrub::VersionRange, Bundler::PubGrub::VersionUnion, or a

needed.
Package is passed to this method but for many implementations is not

Convert a (user-defined) dependency into a format Bundler::PubGrub understands.

Override me!

def parse_dependency(package, dependency)
  raise NotImplementedError
end

def root_dependencies

Returns: Hash in the form of { package => requirement, ... } (see dependencies_for)

If not overridden, this will call dependencies_for with the root package.

Override me!

def root_dependencies
  dependencies_for(@root_package, @root_version)
end

def sort_versions_by_preferred(package, sorted_versions)

Returns: Array of versions in preferred order

If not overridden, the order returned by all_versions_for will be used

Override me (maybe)

def sort_versions_by_preferred(package, sorted_versions)
  indexes = @version_indexes[package]
  sorted_versions.sort_by { |version| indexes[version] }
end

def versions_for(package, range=VersionRange.any)

def versions_for(package, range=VersionRange.any)
  versions = range.select_versions(@sorted_versions[package])
  # Conditional avoids (among other things) calling
  # sort_versions_by_preferred with the root package
  if versions.size > 1
    sort_versions_by_preferred(package, versions)
  else
    versions
  end
end

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