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✏️ Editing: lockfile.rb

require 'strscan'

##
# Parses a gem.deps.rb.lock file and constructs a LockSet containing the
# dependencies found inside.  If the lock file is missing no LockSet is
# constructed.

class Gem::RequestSet::Lockfile

##
  # Raised when a lockfile cannot be parsed

class ParseError < Gem::Exception

##
    # The column where the error was encountered

attr_reader :column

##
    # The line where the error was encountered

attr_reader :line

##
    # The location of the lock file

attr_reader :path

##
    # Raises a ParseError with the given +message+ which was encountered at a
    # +line+ and +column+ while parsing.

def initialize message, column, line, path
      @line   = line
      @column = column
      @path   = path
      super "#{message} (at line #{line} column #{column})"
    end

end

##
  # The platforms for this Lockfile

attr_reader :platforms

##
  # Creates a new Lockfile for the given +request_set+ and +gem_deps_file+
  # location.

def initialize request_set, gem_deps_file, dependencies = nil
    @set           = request_set
    @dependencies  = dependencies
    @gem_deps_file = File.expand_path(gem_deps_file)
    @gem_deps_dir  = File.dirname(@gem_deps_file)

@gem_deps_file.untaint unless gem_deps_file.tainted?

@current_token  = nil
    @line           = 0
    @line_pos       = 0
    @platforms      = []
    @tokens         = []
  end

def add_DEPENDENCIES out # :nodoc:
    out << "DEPENDENCIES"

dependencies =
      if @dependencies then
        @dependencies.sort_by { |name,| name }.map do |name, requirement|
          requirement_string =
            if '!' == requirement then
              requirement
            else
              Gem::Requirement.new(requirement).for_lockfile
            end

[name, requirement_string]
        end
      else
        @requests.sort_by { |r| r.name }.map do |request|
          spec        = request.spec
          name        = request.name
          requirement = request.request.dependency.requirement

requirement_string =
            if [Gem::Resolver::VendorSpecification,
                Gem::Resolver::GitSpecification].include? spec.class then
              "!"
            else
              requirement.for_lockfile
            end

[name, requirement_string]
        end
      end

dependencies = dependencies.map do |name, requirement_string|
      "  #{name}#{requirement_string}"
    end

out.concat dependencies

out << nil
  end

def add_GEM out # :nodoc:
    return if @spec_groups.empty?

source_groups = @spec_groups.values.flatten.group_by do |request|
      request.spec.source.uri
    end

source_groups.sort_by { |group,| group.to_s }.map do |group, requests|
      out << "GEM"
      out << "  remote: #{group}"
      out << "  specs:"

requests.sort_by { |request| request.name }.each do |request|
        next if request.spec.name == 'bundler'
        platform = "-#{request.spec.platform}" unless
          Gem::Platform::RUBY == request.spec.platform

out << "    #{request.name} (#{request.version}#{platform})"

request.full_spec.dependencies.sort.each do |dependency|
          next if dependency.type == :development

requirement = dependency.requirement
          out << "      #{dependency.name}#{requirement.for_lockfile}"
        end
      end
      out << nil
    end
  end

def add_GIT out
    return unless git_requests =
      @spec_groups.delete(Gem::Resolver::GitSpecification)

by_repository_revision = git_requests.group_by do |request|
      source = request.spec.source
      [source.repository, source.rev_parse]
    end

out << "GIT"
    by_repository_revision.each do |(repository, revision), requests|
      out << "  remote: #{repository}"
      out << "  revision: #{revision}"
      out << "  specs:"

requests.sort_by { |request| request.name }.each do |request|
        out << "    #{request.name} (#{request.version})"

dependencies = request.spec.dependencies.sort_by { |dep| dep.name }
        dependencies.each do |dep|
          out << "      #{dep.name}#{dep.requirement.for_lockfile}"
        end
      end
    end

out << nil
  end

def relative_path_from dest, base # :nodoc:
    dest = File.expand_path(dest)
    base = File.expand_path(base)

if dest.index(base) == 0 then
      offset = dest[base.size+1..-1]

return '.' unless offset

offset
    else
      dest
    end
  end

def add_PATH out # :nodoc:
    return unless path_requests =
      @spec_groups.delete(Gem::Resolver::VendorSpecification)

out << "PATH"
    path_requests.each do |request|
      directory = File.expand_path(request.spec.source.uri)

out << "  remote: #{relative_path_from directory, @gem_deps_dir}"
      out << "  specs:"
      out << "    #{request.name} (#{request.version})"
    end

out << nil
  end

def add_PLATFORMS out # :nodoc:
    out << "PLATFORMS"

platforms = @requests.map { |request| request.spec.platform }.uniq

platforms = platforms.sort_by { |platform| platform.to_s }

platforms.sort.each do |platform|
      out << "  #{platform}"
    end

out << nil
  end

##
  # Gets the next token for a Lockfile

def get expected_types = nil, expected_value = nil # :nodoc:
    @current_token = @tokens.shift

type, value, column, line = @current_token

if expected_types and not Array(expected_types).include? type then
      unget

message = "unexpected token [#{type.inspect}, #{value.inspect}], " +
                "expected #{expected_types.inspect}"

raise ParseError.new message, column, line, "#{@gem_deps_file}.lock"
    end

if expected_value and expected_value != value then
      unget

message = "unexpected token [#{type.inspect}, #{value.inspect}], " +
                "expected [#{expected_types.inspect}, " +
                "#{expected_value.inspect}]"

raise ParseError.new message, column, line, "#{@gem_deps_file}.lock"
    end

@current_token
  end

def parse # :nodoc:
    tokenize

until @tokens.empty? do
      type, data, column, line = get

case type
      when :section then
        skip :newline

case data
        when 'DEPENDENCIES' then
          parse_DEPENDENCIES
        when 'GIT' then
          parse_GIT
        when 'GEM' then
          parse_GEM
        when 'PATH' then
          parse_PATH
        when 'PLATFORMS' then
          parse_PLATFORMS
        else
          type, = get until @tokens.empty? or peek.first == :section
        end
      else
        raise "BUG: unhandled token #{type} (#{data.inspect}) at line #{line} column #{column}"
      end
    end
  end

def parse_DEPENDENCIES # :nodoc:
    while not @tokens.empty? and :text == peek.first do
      _, name, = get :text

requirements = []

case peek[0]
      when :bang then
        get :bang

requirements << pinned_requirement(name)
      when :l_paren then
        get :l_paren

loop do
          _, op,      = get :requirement
          _, version, = get :text

requirements << "#{op} #{version}"

break unless peek[0] == :comma

get :comma
        end

get :r_paren

if peek[0] == :bang then
          requirements.clear
          requirements << pinned_requirement(name)

get :bang
        end
      end

@set.gem name, *requirements

skip :newline
    end
  end

def parse_GEM # :nodoc:
    sources = []

while [:entry, 'remote'] == peek.first(2) do
      get :entry, 'remote'
      _, data, = get :text
      skip :newline

sources << Gem::Source.new(data)
    end

sources << Gem::Source.new(Gem::DEFAULT_HOST) if sources.empty?

get :entry, 'specs'

skip :newline

set = Gem::Resolver::LockSet.new sources
    last_specs = nil

while not @tokens.empty? and :text == peek.first do
      _, name, column, = get :text

case peek[0]
      when :newline then
        last_specs.each do |spec|
          spec.add_dependency Gem::Dependency.new name if column == 6
        end
      when :l_paren then
        get :l_paren

type, data, = get [:text, :requirement]

if type == :text and column == 4 then
          version, platform = data.split '-', 2

platform =
            platform ? Gem::Platform.new(platform) : Gem::Platform::RUBY

last_specs = set.add name, version, platform
        else
          dependency = parse_dependency name, data

last_specs.each do |spec|
            spec.add_dependency dependency
          end
        end

get :r_paren
      else
        raise "BUG: unknown token #{peek}"
      end

skip :newline
    end

@set.sets << set
  end

def parse_GIT # :nodoc:
    get :entry, 'remote'
    _, repository, = get :text

skip :newline

get :entry, 'revision'
    _, revision, = get :text

skip :newline

type, value = peek.first 2
    if type == :entry and %w[branch ref tag].include? value then
      get
      get :text

skip :newline
    end

get :entry, 'specs'

skip :newline

set = Gem::Resolver::GitSet.new
    set.root_dir = @set.install_dir

last_spec = nil

while not @tokens.empty? and :text == peek.first do
      _, name, column, = get :text

case peek[0]
      when :newline then
        last_spec.add_dependency Gem::Dependency.new name if column == 6
      when :l_paren then
        get :l_paren

type, data, = get [:text, :requirement]

if type == :text and column == 4 then
          last_spec = set.add_git_spec name, data, repository, revision, true
        else
          dependency = parse_dependency name, data

last_spec.add_dependency dependency
        end

get :r_paren
      else
        raise "BUG: unknown token #{peek}"
      end

skip :newline
    end

@set.sets << set
  end

def parse_PATH # :nodoc:
    get :entry, 'remote'
    _, directory, = get :text

skip :newline

get :entry, 'specs'

skip :newline

set = Gem::Resolver::VendorSet.new
    last_spec = nil

while not @tokens.empty? and :text == peek.first do
      _, name, column, = get :text

case peek[0]
      when :newline then
        last_spec.add_dependency Gem::Dependency.new name if column == 6
      when :l_paren then
        get :l_paren

type, data, = get [:text, :requirement]

if type == :text and column == 4 then
          last_spec = set.add_vendor_gem name, directory
        else
          dependency = parse_dependency name, data

last_spec.dependencies << dependency
        end

get :r_paren
      else
        raise "BUG: unknown token #{peek}"
      end

skip :newline
    end

@set.sets << set
  end

def parse_PLATFORMS # :nodoc:
    while not @tokens.empty? and :text == peek.first do
      _, name, = get :text

@platforms << name

skip :newline
    end
  end

##
  # Parses the requirements following the dependency +name+ and the +op+ for
  # the first token of the requirements and returns a Gem::Dependency object.

def parse_dependency name, op # :nodoc:
    return Gem::Dependency.new name, op unless peek[0] == :text

_, version, = get :text

requirements = ["#{op} #{version}"]

while peek[0] == :comma do
      get :comma
      _, op,      = get :requirement
      _, version, = get :text

requirements << "#{op} #{version}"
    end

Gem::Dependency.new name, requirements
  end

##
  # Peeks at the next token for Lockfile

def peek # :nodoc:
    @tokens.first || [:EOF]
  end

def pinned_requirement name # :nodoc:
    spec = @set.sets.select { |set|
      Gem::Resolver::GitSet    === set or
        Gem::Resolver::VendorSet === set
    }.map { |set|
      set.specs[name]
    }.compact.first

spec.version
  end

def skip type # :nodoc:
    get while not @tokens.empty? and peek.first == type
  end

##
  # The contents of the lock file.

def to_s
    @set.resolve

out = []

@requests = @set.sorted_requests

@spec_groups = @requests.group_by do |request|
      request.spec.class
    end

add_PATH out

add_GIT out

add_GEM out

add_PLATFORMS out

add_DEPENDENCIES out

out.join "\n"
  end

##
  # Calculates the column (by byte) and the line of the current token based on
  # +byte_offset+.

def token_pos byte_offset # :nodoc:
    [byte_offset - @line_pos, @line]
  end

##
  # Converts a lock file into an Array of tokens.  If the lock file is missing
  # an empty Array is returned.

def tokenize # :nodoc:
    @line     = 0
    @line_pos = 0

@platforms     = []
    @tokens        = []
    @current_token = nil

lock_file = "#{@gem_deps_file}.lock"

@input = File.read lock_file
    s      = StringScanner.new @input

until s.eos? do
      pos = s.pos

pos = s.pos if leading_whitespace = s.scan(/ +/)

if s.scan(/[<|=>]{7}/) then
        message = "your #{lock_file} contains merge conflict markers"
        column, line = token_pos pos

raise ParseError.new message, column, line, lock_file
      end

@tokens <<
        case
        when s.scan(/\r?\n/) then
          token = [:newline, nil, *token_pos(pos)]
          @line_pos = s.pos
          @line += 1
          token
        when s.scan(/[A-Z]+/) then
          if leading_whitespace then
            text = s.matched
            text += s.scan(/[^\s)]*/).to_s # in case of no match
            [:text, text, *token_pos(pos)]
          else
            [:section, s.matched, *token_pos(pos)]
          end
        when s.scan(/([a-z]+):\s/) then
          s.pos -= 1 # rewind for possible newline
          [:entry, s[1], *token_pos(pos)]
        when s.scan(/\(/) then
          [:l_paren, nil, *token_pos(pos)]
        when s.scan(/\)/) then
          [:r_paren, nil, *token_pos(pos)]
        when s.scan(/<=|>=|=|~>|<|>|!=/) then
          [:requirement, s.matched, *token_pos(pos)]
        when s.scan(/,/) then
          [:comma, nil, *token_pos(pos)]
        when s.scan(/!/) then
          [:bang, nil, *token_pos(pos)]
        when s.scan(/[^\s),!]*/) then
          [:text, s.matched, *token_pos(pos)]
        else
          raise "BUG: can't create token for: #{s.string[s.pos..-1].inspect}"
        end
    end

@tokens
  rescue Errno::ENOENT
    @tokens
  end

##
  # Ungets the last token retrieved by #get

def unget # :nodoc:
    @tokens.unshift @current_token
  end

##
  # Writes the lock file alongside the gem dependencies file

def write
    content = to_s

open "#{@gem_deps_file}.lock", 'w' do |io|
      io.write content
    end
  end

end

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