# Rules without side effects.

# Vanilla Jam compatibility
if ! $(INVOCATION_SUBDIR_SET) {
	rule FIsPrefix
	{
		# FIsPrefix <a> : <b> ;
		# Returns true, if list <a> is a prefix (a proper one or equal) of
		# list <b>, an empty list otherwise.
		local a = $(1) ;
		local b = $(2) ;
		while $(a) && $(a[1]) = $(b[1]) {
			a = $(a[2-]) ;
			b = $(b[2-]) ;
		}
	
		if $(a) {
			return ;
		} else {
			return true ;
		}
	}

	rule LocalClean { Clean $(1) : $(2) ; }

	rule LocalDepends { Depends $(1) : $(2) ; }

} # vanilla Jam compatibility

rule FFilter
{
	# FFilter <list> : <excludes> ;
	# Removes all occurrences of <excludes> in <list>.

	local list = $(1) ;
	local excludes = $(2) ;
	local newList ;
	local item ;
	for item in $(list) {
		local skip ;
		local exclude ;
		for exclude in $(excludes) {
			if $(item) = $(exclude) {
				skip = true ;
			}
		}
		if ! $(skip) {
			newList += $(item) ;
		}
	}
	return $(newList) ;
}

rule FGetGrist
{
	# FGetGrist <target> ;
	#
	# Returns the grist of a target, not including leading "<" and trailing ">".

	local grist = $(1[1]:G) ;
	if ! $(grist) {
		return ;
	}

	return [ Match <(.*)> : $(grist) ] ;
}

rule FSplitPath
{
	# SplitPath <path> ;
	# Decomposes a path into its components.
	local path = $(1:G=) ;
	local components ;
	# $(path:D) for "/" is "/". Therefore the second condition.
	while $(path:D) && $(path:D) != $(path)
	{
		# Note: $(path:B) returns "." for "..", but $(path:D=) is fine.
		components = $(path:D=) $(components) ;
		path = $(path:D) ;
	}
	components = $(path) $(components) ;
	return $(components) ;
}

rule FTimeZoneBinaries
{
	local sources = $(1:G=timezone-source) ;
	local locate = $(2) ;
	local setRelativeTimezoneDir = $(3) ;
	
	local gristedBinaries ;
	
	local source ;
	for source in $(sources) {
		local binaries = [ on $(source) return $(TZ_OBJECTS) ] ;

		local targetDir = [ FDirName $(TARGET_COMMON_DEBUG_OBJECT_DIR)
			data etc timezones ] ;

		local binary ;
		for binary in $(binaries) {
			local dir = $(binary:D) ;
			if $(dir) {
				binary = $(binary:BSG=timezone!$(dir)) ;
				if $(locate) {
					LOCATE on $(binary) = [ FDirName $(targetDir) $(dir) ] ;
				}
			} else {
				binary = $(binary:BSG=timezone) ;
				if $(locate) {
					LOCATE on $(binary) = $(targetDir) ;
				}
			}

			if $(setRelativeTimezoneDir) {
				RELATIVE_TIMEZONE_DIR on $(binary) = $(dir) ;
			}

			gristedBinaries += $(binary) ;
		}
	}

	return $(gristedBinaries) ;
}


rule SetPlatformCompatibilityFlagVariables
{
	# SetPlatformCompatibilityFlagVariables <platform var> : <var prefix>
	#	: <platform kind> [ : other platforms ] ;

	local platformVar = $(1) ;
	local platform = $($(platformVar)) ;
	local varPrefix = $(2) ;
	local platformKind = $(3) ;
	local otherPlatforms = $(4) ;

	if ! $(platform) {
		ECHO "Variable $(platformVar) not set. Please run ./configure or" ;
		EXIT "specify it manually." ;
	}

	# special case: Haiku libbe.so built for testing under BeOS
	if $(platform) = libbe_test {
		platform = haiku ;
	}

	$(varPrefix)_PLATFORM_BEOS_COMPATIBLE = ;
	$(varPrefix)_PLATFORM_BONE_COMPATIBLE = ;
	$(varPrefix)_PLATFORM_DANO_COMPATIBLE = ;
	$(varPrefix)_PLATFORM_HAIKU_COMPATIBLE = ;
	
	switch $(platform)
	{
		case r5 :
		{
			$(varPrefix)_PLATFORM_BEOS_COMPATIBLE = true ;
		}
		
		case bone : 
		{
			$(varPrefix)_PLATFORM_BONE_COMPATIBLE = true ;
		}
		
		case dano :
		{
			$(varPrefix)_PLATFORM_DANO_COMPATIBLE = true ;
		}
		
		case haiku :
		{
			$(varPrefix)_PLATFORM_HAIKU_COMPATIBLE = true ;
		}
	
		case * :
		{
			if ! ( $(platform) in $(otherPlatforms) ) {
				Exit Unsupported $(platformKind) platform: $(platform) ;
			}
		}
	}

	# set lesser flags, e.g. "DANO" for "HAIKU" and "BEOS" for "BONE"
	$(varPrefix)_PLATFORM_DANO_COMPATIBLE
		?= $($(varPrefix)_PLATFORM_HAIKU_COMPATIBLE) ;
	$(varPrefix)_PLATFORM_BONE_COMPATIBLE
		?= $($(varPrefix)_PLATFORM_DANO_COMPATIBLE) ;
	$(varPrefix)_PLATFORM_BEOS_COMPATIBLE
		?= $($(varPrefix)_PLATFORM_BONE_COMPATIBLE) ;

	# set the machine friendly flags
	$(varPrefix)_PLATFORM_(haiku)_COMPATIBLE
		?= $($(varPrefix)_PLATFORM_HAIKU_COMPATIBLE) ;
	$(varPrefix)_PLATFORM_(dano)_COMPATIBLE
		?= $($(varPrefix)_PLATFORM_DANO_COMPATIBLE) ;
	$(varPrefix)_PLATFORM_(bone)_COMPATIBLE
		?= $($(varPrefix)_PLATFORM_BONE_COMPATIBLE) ;
	$(varPrefix)_PLATFORM_(r5)_COMPATIBLE
		?= $($(varPrefix)_PLATFORM_BEOS_COMPATIBLE) ;

	$(varPrefix)_PLATFORM_(libbe_test)_COMPATIBLE
		?= $($(varPrefix)_PLATFORM_BEOS_COMPATIBLE) ;
}

rule FAnalyzeGCCVersion
{
	# FAnalyzeGCCVersion <rawVersionVariable> ;
	#
	local varName = $(1) ;
	local rawVersion = $($(varName)) ;

	if ! $(rawVersion) {
		ECHO "Variable $(varName) not set. Please run ./configure or" ;
		EXIT "specify it manually." ;
	}

	local version = ;
	# split the raw version string at `.' and `-' characters
	while $(rawVersion) {
		local split = [ Match "([^.-]*)[.-](.*)" : $(rawVersion) ] ;
		if $(split) {
			version += $(split[1]) ;
			rawVersion = $(split[2]) ;
		} else {
			version += $(rawVersion) ;
			rawVersion = ;
		}
	}

	return $(version) ;
}

rule SetIncludePropertiesVariables
{
	# SetIncludePropertiesVariables <varPrefix> ;
	#
	local prefix = $(1) ;
	if $($(prefix)_GCC_VERSION[1]) < 4 {
		$(prefix)_INCLUDES_SEPARATOR = -I- ;
		$(prefix)_LOCAL_INCLUDES_OPTION = -I ;
		$(prefix)_SYSTEM_INCLUDES_OPTION = -I ;
	} else {
		$(prefix)_INCLUDES_SEPARATOR = ;
		$(prefix)_LOCAL_INCLUDES_OPTION = "-iquote " ;
		$(prefix)_SYSTEM_INCLUDES_OPTION = "-idirafter " ;
	}
}


#pragma mark -

rule SetPlatformForTarget
{
	# SetPlatformForTarget <target> : <platform> ;

	PLATFORM on $(1) = $(2) ;
}

rule SetSubDirPlatform
{
	# SetSubDirPlatform <platform> ;

	PLATFORM = $(1) ;
}

rule SetSupportedPlatformsForTarget
{
	# SetSupportedPlatformsForTarget <target> : <platforms> ;

	SUPPORTED_PLATFORMS on $(1) = $(2) ;
}

rule SetSubDirSupportedPlatforms
{
	# SetSubDirSupportedPlatforms <platforms> ;

	SUPPORTED_PLATFORMS = $(1) ;
}

rule AddSubDirSupportedPlatforms
{
	# AddSubDirSupportedPlatforms <platforms> ;

	SUPPORTED_PLATFORMS += $(1) ;
}

rule SetSubDirSupportedPlatformsBeOSCompatible
{
	# SetSubDirSupportedPlatformsBeOSCompatible ;

	SUPPORTED_PLATFORMS = $(HAIKU_BEOS_COMPATIBLE_PLATFORMS) ;
}

rule IsPlatformSupportedForTarget
{
	# IsPlatformSupportedForTarget <target> [ : <platform> ]
	#

	on $(1) {
		if $(PLATFORM) in $(SUPPORTED_PLATFORMS) {
			return true ;
		} else {
			return ;
		}
	}
}

rule InheritPlatform
{
	# InheritPlatform <children> : <parent> ;
	# PLATFORM and SUPPORTED_PLATFORMS are set on <children> to their value
	# on <parent>.
	#
	local children = $(1) ;
	local parent = $(2) ;

	on $(parent) {
		PLATFORM on $(children) = $(PLATFORM) ;
		SUPPORTED_PLATFORMS on $(children) = $(SUPPORTED_PLATFORMS) ;
	}
}

rule SubDirAsFlags
{
        SUBDIRASFLAGS += $(<) ;
}