diff options
Diffstat (limited to 'lib/rubygems/request_set/lockfile')
| -rw-r--r-- | lib/rubygems/request_set/lockfile/parser.rb | 334 | ||||
| -rw-r--r-- | lib/rubygems/request_set/lockfile/tokenizer.rb | 108 |
2 files changed, 442 insertions, 0 deletions
diff --git a/lib/rubygems/request_set/lockfile/parser.rb b/lib/rubygems/request_set/lockfile/parser.rb new file mode 100644 index 0000000000..7778b7ae17 --- /dev/null +++ b/lib/rubygems/request_set/lockfile/parser.rb @@ -0,0 +1,334 @@ +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 + type, data, column, line = get + + case type + when :section then + @tokens.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 + + ## + # 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 current_token + + message = "unexpected token [#{type.inspect}, #{value.inspect}], " + + "expected #{expected_types.inspect}" + + raise Gem::RequestSet::Lockfile::ParseError.new message, column, line, @filename + end + + if expected_value and expected_value != value then + unget current_token + + message = "unexpected token [#{type.inspect}, #{value.inspect}], " + + "expected [#{expected_types.inspect}, " + + "#{expected_value.inspect}]" + + raise Gem::RequestSet::Lockfile::ParseError.new message, column, line, @filename + end + + current_token + 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 + + 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: + spec = @set.sets.select { |set| + Gem::Resolver::GitSet === set or + Gem::Resolver::VendorSet === set + }.map { |set| + set.specs[name] + }.compact.first + + spec.version + end + + ## + # Ungets the last token retrieved by #get + + def unget token # :nodoc: + @tokens.unshift token + end +end + diff --git a/lib/rubygems/request_set/lockfile/tokenizer.rb b/lib/rubygems/request_set/lockfile/tokenizer.rb new file mode 100644 index 0000000000..73c9a834bb --- /dev/null +++ b/lib/rubygems/request_set/lockfile/tokenizer.rb @@ -0,0 +1,108 @@ +require 'strscan' +require 'rubygems/request_set/lockfile/parser' + +class Gem::RequestSet::Lockfile::Tokenizer + def self.from_file file + new File.read(file), file + end + + def initialize input, filename = nil, line = 0, pos = 0 + @line = line + @line_pos = pos + @tokens = [] + @filename = filename + tokenize input + end + + def make_parser set, platforms + Gem::RequestSet::Lockfile::Parser.new self, set, platforms, @filename + end + + def to_a + @tokens + end + + def skip type + @tokens.shift while not @tokens.empty? and peek.first == type + 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 + + def empty? + @tokens.empty? + end + + def unshift token + @tokens.unshift token + end + + def next_token + @tokens.shift + end + alias :shift :next_token + + def peek + @tokens.first || [:EOF] + end + + private + + def tokenize input + 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 #{@filename} contains merge conflict markers" + column, line = token_pos pos + + raise Gem::RequestSet::Lockfile::ParseError.new message, column, line, @filename + 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 + end +end |