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|
## This file defines dependencies and 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, :perl, :python, :rbx, :ruby
].freeze
attr_reader :deps, :requirements
def initialize
@deps = Dependencies.new
@requirements = ComparableSet.new
end
def add spec
tag = nil
spec, tag = spec.shift if spec.is_a? Hash
dep = parse_spec(spec, tag)
# Some symbol specs are conditional, and resolve to nil if there is no
# dependency needed for the current platform.
return if dep.nil?
# Add dep to the correct bucket
(dep.is_a?(Requirement) ? @requirements : @deps) << dep
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
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(tag)
end
when :x11
X11Dependency.new(tag)
when :xcode
XcodeDependency.new(tag)
when :mysql
MysqlInstalled.new(tag)
when :postgresql
PostgresqlInstalled.new(tag)
else
raise "Unsupported special dependency #{spec}"
end
end
end
# A list of formula dependencies.
class Dependencies < Array
def <<(o)
super(o) unless include? o
end
end
module Dependable
RESERVED_TAGS = [:build, :optional, :recommended]
def build?
tags.include? :build
end
def optional?
tags.include? :optional
end
def recommended?
tags.include? :recommended
end
def options
tags.reject { |tag| RESERVED_TAGS.include? tag }.map { |tag| '--'+tag.to_s }
end
end
# A dependency on another Homebrew formula.
class Dependency
include Dependable
attr_reader :name, :tags
def initialize(name, *tags)
@name = name
@tags = [tags].flatten.compact
end
def hash
@name.hash
end
def to_s
@name
end
def ==(other)
@name == other.to_s
end
def <=>(other)
@name <=> other.to_s
end
def eql?(other)
other.is_a? self.class and hash == other.hash
end
end
# A base class for non-formula requirements needed by formulae.
# A "fatal" requirement is one that will fail the build if it is not present.
# By default, Requirements are non-fatal.
class Requirement
include Dependable
attr_reader :tags
def initialize(*tags)
@tags = tags.flatten.compact
end
# Should return true if this requirement is met.
def satisfied?; false; end
# Should return true if not meeting this requirement should fail the build.
def fatal?; false; end
# The message to show when the requirement is not met.
def message; ""; end
# Requirements can modify the current build environment by overriding this.
# See X11Dependency
def modify_build_environment; nil end
def eql?(other)
other.is_a? self.class and hash == other.hash
end
def hash
message.hash
end
end
require 'requirements'
|
