# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

STANDALONE_MAKEFILE := 1

include $(topsrcdir)/config/rules.mk

# Building XPIDLs effectively consists of two steps:
#
#   1) Staging all .idl files to a common directory.
#   2) Doing everything with the .idl files.
#
# Each .idl file is processed into a .h file and typelib information.
# The .h file shares the same stem as the input file and is installed
# in the common headers include directory.
#
# XPIDL files are logically grouped together by modules. The typelib
# information for all XPIDLs in the same module is linked together into
# an .xpt file having the name of the module.
#
# As an optimization to reduce overall CPU usage, we process all .idl
# belonging to a module with a single command invocation. This prevents
# redundant parsing of .idl files and significantly reduces CPU cycles.

# For dependency files.
idl_deps_dir := .deps

dist_idl_dir := $(DIST)/idl
dist_include_dir := $(DIST)/include
process_py := $(topsrcdir)/python/mozbuild/mozbuild/action/xpidl-process.py

# TODO we should use py_action, but that would require extra directories to be
# in the virtualenv.
%.xpt:
	@echo "$(@F)"
	$(PYTHON_PATH) $(PLY_INCLUDE) -I$(IDL_PARSER_DIR) -I$(IDL_PARSER_CACHE_DIR) \
		$(process_py) --cache-dir $(IDL_PARSER_CACHE_DIR) --depsdir $(idl_deps_dir) \
		$(dist_idl_dir) $(dist_include_dir) $(@D) $(libxul_sdk_includes) \
		$(basename $(notdir $@)) $($(basename $(notdir $@))_deps)
# When some IDL is added or removed, if the actual IDL file was already, or
# still is, in the tree, simple dependencies can't detect that the XPT needs
# to be rebuilt.
# Add the current value of $($(xpidl_module)_deps) in the depend file, such that
# we can later check if the value has changed since last build, which will
# indicate whether IDLs were added or removed.
# Note that removing previously built files is not covered.
	@echo $(basename $(notdir $@))_deps_built = $($(basename $(notdir $@))_deps) >> $(idl_deps_dir)/$(basename $(notdir $@)).pp

# Chrome manifests may be written from several Makefiles at various times during
# the build. The 'buildlist' action adds to the file if it already exists, but
# if it does exist, make considers it to be up-to-date (as we have no inputs to
# depend on). We use FORCE to ensure that we always add the interface manifest,
# whether or not the chrome manifest already exists.
%/chrome.manifest: FORCE
	$(call py_action,buildlist,$@ 'manifest components/interfaces.manifest')

chrome_manifests := @chrome_manifests@

%/interfaces.manifest: Makefile
	$(call py_action,buildlist,$@ $(foreach xpt,$(filter $*/%,$(registered_xpt_files)),'interfaces $(notdir $(xpt))'))

interfaces_manifests := @interfaces_manifests@

xpidl_modules := @xpidl_modules@
registered_xpt_files := @registered_xpt_files@
xpt_files := $(registered_xpt_files) @xpt_files@

@xpidl_rules@

depends_files := $(foreach root,$(xpidl_modules),$(idl_deps_dir)/$(root).pp)

GARBAGE += $(xpt_files) $(depends_files)

xpidl:: $(xpt_files) $(chrome_manifests) $(interfaces_manifests)

$(xpt_files): $(process_py) $(call mkdir_deps,$(idl_deps_dir) $(dist_include_dir))

-include $(depends_files)

define xpt_deps
$(1): $(call mkdir_deps,$(dir $(1)))
$(1): $(addsuffix .idl,$(addprefix $(dist_idl_dir)/,$($(basename $(notdir $(1)))_deps)))
ifneq ($($(basename $(notdir $(1)))_deps),$($(basename $(notdir $(1)))_deps_built))
$(1): FORCE
endif
endef

$(foreach xpt,$(xpt_files),$(eval $(call xpt_deps,$(xpt))))

.PHONY: xpidl