class Bundler::LockfileParser

def initialize(lockfile)
  @platforms    = []
  @sources      = []
  @dependencies = []
  @state        = nil
  @specs        = {}
  @rubygems_aggregate = Source::Rubygems.new
  if lockfile.match(/<<<<<<<|=======|>>>>>>>|\|\|\|\|\|\|\|/)
    raise LockfileError, "Your #{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)} contains merge conflicts.\n" \
      "Run `git checkout HEAD -- #{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)}` first to get a clean lock."
  end
  lockfile.split(/(?:\r?\n)+/).each do |line|
    if SOURCE.include?(line)
      @state = :source
      parse_source(line)
    elsif line == DEPENDENCIES
      @state = :dependency
    elsif line == PLATFORMS
      @state = :platform
    elsif line == RUBY
      @state = :ruby
    elsif line == BUNDLED
      @state = :bundled_with
    elsif line =~ /^[^\s]/
      @state = nil
    elsif @state
      send("parse_#{@state}", line)
    end
  end
  @sources << @rubygems_aggregate
  @specs = @specs.values
  warn_for_outdated_bundler_version
rescue ArgumentError => e
  Bundler.ui.debug(e)
  raise LockfileError, "Your lockfile is unreadable. Run `rm #{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)}` " \
    "and then `bundle install` to generate a new lockfile."
end

def parse_bundled_with(line)
  line = line.strip
  return unless Gem::Version.correct?(line)
  @bundler_version = Gem::Version.create(line)
end

def parse_dependency(line)
  if line =~ NAME_VERSION_2
    name = $1
    version = $2
    pinned = $4
    version = version.split(",").map(&:strip) if version
    dep = Bundler::Dependency.new(name, version)
    if pinned && dep.name != "bundler"
      spec = @specs.find {|_, v| v.name == dep.name }
      dep.source = spec.last.source if spec
      # Path sources need to know what the default name / version
      # to use in the case that there are no gemspecs present. A fake
      # gemspec is created based on the version set on the dependency
      # TODO: Use the version from the spec instead of from the dependency
      if version && version.size == 1 && version.first =~ /^\s*= (.+)\s*$/ && dep.source.is_a?(Bundler::Source::Path)
        dep.source.name    = name
        dep.source.version = $1
      end
    end
    @dependencies << dep
  end
end

def parse_platform(line)
  @platforms << Gem::Platform.new($1) if line =~ /^  (.*)$/
end

def parse_ruby(line)
  @ruby_version = line.strip
end

def parse_source(line)
  case line
  when GIT, GEM, PATH
    @current_source = nil
    @opts = {}
    @type = line
  when SPECS
    case @type
    when PATH
      @current_source = TYPES[@type].from_lock(@opts)
      @sources << @current_source
    when GIT
      @current_source = TYPES[@type].from_lock(@opts)
      # Strip out duplicate GIT sections
      if @sources.include?(@current_source)
        @current_source = @sources.find {|s| s == @current_source }
      else
        @sources << @current_source
      end
    when GEM
      Array(@opts["remote"]).each do |url|
        @rubygems_aggregate.add_remote(url)
      end
      @current_source = @rubygems_aggregate
    end
  when OPTIONS
    value = $2
    value = true if value == "true"
    value = false if value == "false"
    key = $1
    if @opts[key]
      @opts[key] = Array(@opts[key])
      @opts[key] << value
    else
      @opts[key] = value
    end
  else
    parse_spec(line)
  end
end

def parse_spec(line)
  if line =~ NAME_VERSION_4
    name = $1
    version = Gem::Version.new($2)
    platform = $3 ? Gem::Platform.new($3) : Gem::Platform::RUBY
    @current_spec = LazySpecification.new(name, version, platform)
    @current_spec.source = @current_source
    # Avoid introducing multiple copies of the same spec (caused by
    # duplicate GIT sections)
    @specs[@current_spec.identifier] ||= @current_spec
  elsif line =~ NAME_VERSION_6
    name = $1
    version = $2
    version = version.split(",").map(&:strip) if version
    dep = Gem::Dependency.new(name, version)
    @current_spec.dependencies << dep
  end
end

def warn_for_outdated_bundler_version
  return unless bundler_version
  prerelease_text = bundler_version.prerelease? ? " --pre" : ""
  current_version = Gem::Version.create(Bundler::VERSION)
  case current_version.segments.first <=> bundler_version.segments.first
  when -1
    raise LockfileError, "You must use Bundler #{bundler_version.segments.first} or greater with this lockfile."
  when 0
    if current_version < bundler_version
      Bundler.ui.warn "Warning: the running version of Bundler is older " \
           "than the version that created the lockfile. We suggest you " \
           "upgrade to the latest version of Bundler by running `gem " \
           "install bundler#{prerelease_text}`.\n"
    end
  end
end