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partial_solution.rb

require_relative 'assignment'

module Bundler::PubGrub
  class PartialSolution
    attr_reader :assignments, :decisions
    attr_reader :attempted_solutions

def initialize
      reset!

@attempted_solutions = 1
      @backtracking = false
    end

def decision_level
      @decisions.length
    end

def relation(term)
      package = term.package
      return :overlap if !@terms.key?(package)

@relation_cache[package][term] ||=
        @terms[package].relation(term)
    end

def satisfies?(term)
      relation(term) == :subset
    end

def derive(term, cause)
      add_assignment(Assignment.new(term, cause, decision_level, assignments.length))
    end

def satisfier(term)
      assignment =
        @assignments_by[term.package].bsearch do |assignment_by|
          @cumulative_assignments[assignment_by].satisfies?(term)
        end

assignment || raise("#{term} unsatisfied")
    end

# A list of unsatisfied terms
    def unsatisfied
      @required.keys.reject do |package|
        @decisions.key?(package)
      end.map do |package|
        @terms[package]
      end
    end

def decide(package, version)
      @attempted_solutions += 1 if @backtracking
      @backtracking = false;

decisions[package] = version
      assignment = Assignment.decision(package, version, decision_level, assignments.length)
      add_assignment(assignment)
    end

def backtrack(previous_level)
      @backtracking = true

new_assignments = assignments.select do |assignment|
        assignment.decision_level <= previous_level
      end

new_decisions = Hash[decisions.first(previous_level)]

reset!

@decisions = new_decisions

new_assignments.each do |assignment|
        add_assignment(assignment)
      end
    end

private

def reset!
      # { Array<Assignment> }
      @assignments = []

# { Package => Array<Assignment> }
      @assignments_by = Hash.new { |h,k| h[k] = [] }
      @cumulative_assignments = {}.compare_by_identity

# { Package => Package::Version }
      @decisions = {}

# { Package => Term }
      @terms = {}
      @relation_cache = Hash.new { |h,k| h[k] = {} }

# { Package => Boolean }
      @required = {}
    end

def add_assignment(assignment)
      term = assignment.term
      package = term.package

@assignments << assignment
      @assignments_by[package] << assignment

@required[package] = true if term.positive?

if @terms.key?(package)
        old_term = @terms[package]
        @terms[package] = old_term.intersect(term)
      else
        @terms[package] = term
      end
      @relation_cache[package].clear

@cumulative_assignments[assignment] = @terms[package]
    end
  end
end

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	0755	2025-05-13 07:09:21
..	dir	-	root/linksafe	0755	2025-05-13 07:09:21
assignment.rb	text/x-ruby	516 B	root/linksafe	0644	2025-04-24 07:57:42
basic_package_source.rb	text/x-ruby	6.02 KB	root/linksafe	0644	2025-04-24 07:57:42
failure_writer.rb	text/x-ruby	5.59 KB	root/linksafe	0644	2025-04-24 07:57:42
incompatibility.rb	text/x-ruby	4.07 KB	root/linksafe	0644	2025-04-24 07:57:42
package.rb	text/x-ruby	600 B	root/linksafe	0644	2025-04-24 07:57:42
partial_solution.rb	text/x-ruby	2.71 KB	root/linksafe	0644	2025-04-24 07:57:42
rubygems.rb	text/x-ruby	1.32 KB	root/linksafe	0644	2025-04-24 07:57:42
solve_failure.rb	text/x-ruby	402 B	root/linksafe	0644	2025-04-24 07:57:42
static_package_source.rb	text/x-ruby	1.47 KB	root/linksafe	0644	2025-04-24 07:57:42
term.rb	text/x-ruby	2.38 KB	root/linksafe	0644	2025-04-24 07:57:42
version.rb	text/x-ruby	48 B	root/linksafe	0644	2025-04-24 07:57:42
version_constraint.rb	text/x-ruby	2.53 KB	root/linksafe	0644	2025-04-24 07:57:42
version_range.rb	text/x-ruby	8.17 KB	root/linksafe	0644	2025-04-24 07:57:42
version_solver.rb	text/x-ruby	7.03 KB	root/linksafe	0644	2025-04-24 07:57:42
version_union.rb	text/x-ruby	3.83 KB	root/linksafe	0644	2025-04-24 07:57:42

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