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require_relative 'version_constraint'
require_relative 'incompatibility'
module Bundler::PubGrub
# Types:
#
# Where possible, Bundler::PubGrub will accept user-defined types, so long as they quack.
#
# ## "Package":
#
# This class will be used to represent the various packages being solved for.
# .to_s will be called when displaying errors and debugging info, it should
# probably return the package's name.
# It must also have a reasonable definition of #== and #hash
#
# Example classes: String ("rails")
#
#
# ## "Version":
#
# This class will be used to represent a single version number.
#
# Versions don't need to store their associated package, however they will
# only be compared against other versions of the same package.
#
# It must be Comparible (and implement <=> reasonably)
#
# Example classes: Gem::Version, Integer
#
#
# ## "Dependency"
#
# This class represents the requirement one package has on another. It is
# returned by dependencies_for(package, version) and will be passed to
# parse_dependency to convert it to a format Bundler::PubGrub understands.
#
# It must also have a reasonable definition of #==
#
# Example classes: String ("~> 1.0"), Gem::Requirement
#
class BasicPackageSource
# Override me!
#
# This is called per package to find all possible versions of a package.
#
# It is called at most once per-package
#
# Returns: Array of versions for a package, in preferred order of selection
def all_versions_for(package)
raise NotImplementedError
end
# Override me!
#
# Returns: Hash in the form of { package => requirement, ... }
def dependencies_for(package, version)
raise NotImplementedError
end
# Override me!
#
# Convert a (user-defined) dependency into a format Bundler::PubGrub understands.
#
# Package is passed to this method but for many implementations is not
# needed.
#
# Returns: either a Bundler::PubGrub::VersionRange, Bundler::PubGrub::VersionUnion, or a
# Bundler::PubGrub::VersionConstraint
def parse_dependency(package, dependency)
raise NotImplementedError
end
# Override me!
#
# If not overridden, this will call dependencies_for with the root package.
#
# Returns: Hash in the form of { package => requirement, ... } (see dependencies_for)
def root_dependencies
dependencies_for(@root_package, @root_version)
end
# Override me (maybe)
#
# If not overridden, the order returned by all_versions_for will be used
#
# Returns: Array of versions in preferred order
def sort_versions_by_preferred(package, sorted_versions)
indexes = @version_indexes[package]
sorted_versions.sort_by { |version| indexes[version] }
end
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 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
def no_versions_incompatibility_for(_package, unsatisfied_term)
cause = Incompatibility::NoVersions.new(unsatisfied_term)
Incompatibility.new([unsatisfied_term], cause: cause)
end
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
end
end
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