class Bundler::LockfileParser

def initialize(lockfile)
  @platforms    = []
  @sources      = []
  @dependencies = []
  @state        = :source
  @specs        = {}
  if lockfile.match(/<<<<<<<|=======|>>>>>>>|\|\|\|\|\|\|\|/)
    raise LockfileError, "Your Gemfile.lock contains merge conflicts.\n" \
      "Run `git checkout HEAD -- Gemfile.lock` first to get a clean lock."
  end
  lockfile.split(/(?:\r?\n)+/).each do |line|
    if line == DEPENDENCIES
      @state = :dependency
    elsif line == PLATFORMS
      @state = :platform
    else
      send("parse_#{@state}", line)
    end
  end
  @specs = @specs.values
end

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

def parse_source(line)
  case line
  when GIT, GEM, PATH
    @current_source = nil
    @opts, @type = {}, line
  when SPECS
    @current_source = TYPES[@type].from_lock(@opts)
    # Strip out duplicate GIT sections
    if @sources.include?(@current_source) && @current_source.is_a?(Bundler::Source::Git)
      @current_source = @sources.find { |s| s == @current_source }
    end
    @sources << @current_source
  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, version = $1, 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, version = $1, $2
    version = version.split(',').map { |d| d.strip } if version
    dep = Gem::Dependency.new(name, version)
    @current_spec.dependencies << dep
  end
end