# Defines the building blocks of openMSX and their dependencies.

class Component(object):

	niceName = None

	makeName = None

	dependsOn = None

	@classmethod

	def canBuild(cls, probeVars):

		return all(

			probeVars.get('HAVE_%s_H' % makeName) and

			probeVars.get('HAVE_%s_LIB' % makeName)

			for makeName in cls.dependsOn

			)

class EmulationCore(Component):

	niceName = 'Emulation core'

	makeName = 'CORE'

	dependsOn = ('SDL2', 'SDL2_TTF', 'FREETYPE', 'PNG', 'TCL', 'ZLIB')

class GLRenderer(Component):

	niceName = 'GL renderer'

	makeName = 'GL'

	dependsOn = ('GL', 'GLEW')

class Laserdisc(Component):

	niceName = 'Laserdisc'

	makeName = 'LASERDISC'

	dependsOn = ('OGG', 'VORBIS', 'THEORA')

class ALSAMIDI(Component):

	niceName = 'ALSA MIDI'

	makeName = 'ALSAMIDI'

	dependsOn = ('ALSA', )

def iterComponents():

	'''Iterates through all components of openMSX.

	'''

	yield EmulationCore

	yield GLRenderer

	yield Laserdisc

	yield ALSAMIDI

def iterBuildableComponents(probeVars):

	'''Iterates through those components of openMSX that can be built

	on the probed system.

	'''

	for component in iterComponents():

		if component.canBuild(probeVars):

			yield component

def requiredLibrariesFor(components):

	'''Compute the library packages required to build the given components.

	Only the direct dependencies from openMSX are included, not dependencies

	between libraries.

	Returns a set of Make names.

	'''

	return set(

		makeName

		for comp in components

		for makeName in comp.dependsOn

		)