library/rubygems/request_set/lockfile/parser.rb
# frozen_string_literal: true
class Gem::RequestSet::Lockfile::Parser
###
# Parses lockfiles
def initialize tokenizer, set, platforms, filename = nil
@tokens = tokenizer
@filename = filename
@set = set
@platforms = platforms
end
def parse
until @tokens.empty? do
token = get
case token.type
when :section then
@tokens.skip :newline
case token.value
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
token = get until @tokens.empty? or peek.first == :section
end
else
raise "BUG: unhandled token #{token.type} (#{token.value.inspect}) at line #{token.line} column #{token.column}"
end
end
end
##
# Gets the next token for a Lockfile
def get expected_types = nil, expected_value = nil # :nodoc:
token = @tokens.shift
if expected_types and not Array(expected_types).include? token.type then
unget token
message = "unexpected token [#{token.type.inspect}, #{token.value.inspect}], " +
"expected #{expected_types.inspect}"
raise Gem::RequestSet::Lockfile::ParseError.new message, token.column, token.line, @filename
end
if expected_value and expected_value != token.value then
unget token
message = "unexpected token [#{token.type.inspect}, #{token.value.inspect}], " +
"expected [#{expected_types.inspect}, " +
"#{expected_value.inspect}]"
raise Gem::RequestSet::Lockfile::ParseError.new message, token.column, token.line, @filename
end
token
end
def parse_DEPENDENCIES # :nodoc:
while not @tokens.empty? and :text == peek.type do
token = get :text
requirements = []
case peek[0]
when :bang then
get :bang
requirements << pinned_requirement(token.value)
when :l_paren then
get :l_paren
loop do
op = get(:requirement).value
version = get(:text).value
requirements << "#{op} #{version}"
break unless peek.type == :comma
get :comma
end
get :r_paren
if peek[0] == :bang then
requirements.clear
requirements << pinned_requirement(token.value)
get :bang
end
end
@set.gem token.value, *requirements
skip :newline
end
end
def parse_GEM # :nodoc:
sources = []
while [:entry, 'remote'] == peek.first(2) do
get :entry, 'remote'
data = get(:text).value
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.type do
token = get :text
name = token.value
column = token.column
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
token = get [:text, :requirement]
type = token.type
data = token.value
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).value
skip :newline
get :entry, 'revision'
revision = get(:text).value
skip :newline
type = peek.type
value = peek.value
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.type do
token = get :text
name = token.value
column = token.column
case peek[0]
when :newline then
last_spec.add_dependency Gem::Dependency.new name if column == 6
when :l_paren then
get :l_paren
token = get [:text, :requirement]
type = token.type
data = token.value
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).value
skip :newline
get :entry, 'specs'
skip :newline
set = Gem::Resolver::VendorSet.new
last_spec = nil
while not @tokens.empty? and :text == peek.first do
token = get :text
name = token.value
column = token.column
case peek[0]
when :newline then
last_spec.add_dependency Gem::Dependency.new name if column == 6
when :l_paren then
get :l_paren
token = get [:text, :requirement]
type = token.type
data = token.value
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).value
@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).value
requirements = ["#{op} #{version}"]
while peek.type == :comma do
get :comma
op = get(:requirement).value
version = get(:text).value
requirements << "#{op} #{version}"
end
Gem::Dependency.new name, requirements
end
private
def skip type # :nodoc:
@tokens.skip type
end
##
# Peeks at the next token for Lockfile
def peek # :nodoc:
@tokens.peek
end
if [].respond_to? :flat_map
def pinned_requirement name # :nodoc:
requirement = Gem::Dependency.new name
specification = @set.sets.flat_map { |set|
set.find_all(requirement)
}.compact.first
specification && specification.version
end
else # FIXME: remove when 1.8 is dropped
def pinned_requirement name # :nodoc:
requirement = Gem::Dependency.new name
specification = @set.sets.map { |set|
set.find_all(requirement)
}.flatten(1).compact.first
specification && specification.version
end
end
##
# Ungets the last token retrieved by #get
def unget token # :nodoc:
@tokens.unshift token
end
end