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require 'dependency'
require 'dependencies'
require 'requirement'
require 'requirements'
## A dependency is a formula that another formula needs to install.
## A requirement is something other than a formula that another formula
## needs to be present. This includes external language modules,
## command-line tools in the path, or any arbitrary predicate.
##
## The `depends_on` method in the formula DSL is used to declare
## dependencies and requirements.
# This class is used by `depends_on` in the formula DSL to turn dependency
# specifications into the proper kinds of dependencies and requirements.
class DependencyCollector
# Define the languages that we can handle as external dependencies.
LANGUAGE_MODULES = [
:chicken, :jruby, :lua, :node, :ocaml, :perl, :python, :rbx, :ruby
].freeze
attr_reader :deps, :requirements
def initialize
@deps = Dependencies.new
@requirements = ComparableSet.new
end
def add(spec)
case dep = build(spec)
when Dependency
@deps << dep
when Requirement
@requirements << dep
end
dep
end
def build(spec)
spec, tag = case spec
when Hash then spec.shift
else spec
end
parse_spec(spec, tag)
end
private
def parse_spec spec, tag
case spec
when Symbol
parse_symbol_spec(spec, tag)
when String
if LANGUAGE_MODULES.include? tag
LanguageModuleDependency.new(tag, spec)
else
Dependency.new(spec, tag)
end
when Formula
Dependency.new(spec.name, tag)
when Dependency, Requirement
spec
when Class
if spec < Requirement
spec.new
else
raise "#{spec} is not a Requirement subclass"
end
else
raise "Unsupported type #{spec.class} for #{spec}"
end
end
def parse_symbol_spec spec, tag
case spec
when :autoconf, :automake, :bsdmake, :libtool
# Xcode no longer provides autotools or some other build tools
Dependency.new(spec.to_s, tag) unless MacOS::Xcode.provides_autotools?
when :libpng, :freetype, :pixman, :fontconfig, :cairo
if MacOS.version >= :mountain_lion
Dependency.new(spec.to_s, tag)
else
X11Dependency.new(spec.to_s, tag)
end
when :x11
X11Dependency.new(spec.to_s, tag)
when :xcode
XcodeDependency.new(tag)
when :mysql
MysqlInstalled.new(tag)
when :postgresql
PostgresqlInstalled.new(tag)
when :tex
TeXInstalled.new(tag)
when :clt
CLTDependency.new(tag)
else
raise "Unsupported special dependency #{spec}"
end
end
end
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