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# 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? || 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 && !Array(expected_types).include?(token.type)
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 && expected_value != token.value
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 !@tokens.empty? && peek.type == :text 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
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 peek.first(2) == [:entry, "remote"] 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 !@tokens.empty? && peek.type == :text 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 && column == 4
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 && %w[branch ref tag].include?(value)
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 !@tokens.empty? && peek.type == :text 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 && column == 4
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 !@tokens.empty? && peek.first == :text 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 && column == 4
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 !@tokens.empty? && peek.first == :text 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
def pinned_requirement(name) # :nodoc:
requirement = Gem::Dependency.new name
specification = @set.sets.flat_map do |set|
set.find_all(requirement)
end.compact.first
specification&.version
end
##
# Ungets the last token retrieved by #get
def unget(token) # :nodoc:
@tokens.unshift token
end
end