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#
# Copyright (c) 2018 Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
#
# Redistribution and use is allowed according to the terms of the New
# BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
#
#.rst:
# ExtractSymbols
# --------------
#
# This is a helper script for FindABImap.cmake.
#
# Extract symbols from header files and output a list to a file.
# This script is run in build time to extract symbols from the provided header
# files. This way, symbols added or removed can be checked and used to update
# the symbol version script.
#
# All symbols followed by the character ``'('`` are extracted. If a
# ``FILTER_PATTERN`` is provided, only the lines containing the given string are
# considered.
#
# Expected defined variables
# --------------------------
#
# ``HEADERS_LIST_FILE``:
# Required, expects a file containing the list of header files to be parsed.
#
# ``OUTPUT_PATH``:
# Required, expects the output file path.
#
# Optionally defined variables
# ----------------------------
#
# ``FILTER_PATTERN``:
# Expects a string. Only lines containing the given string will be considered
# when extracting symbols.
#
if (NOT DEFINED OUTPUT_PATH)
message(SEND_ERROR "OUTPUT_PATH not defined")
endif()
if (NOT DEFINED HEADERS_LIST_FILE)
message(SEND_ERROR "HEADERS not defined")
endif()
file(READ ${HEADERS_LIST_FILE} HEADERS_LIST)
set(symbols)
foreach(header ${HEADERS_LIST})
# Filter only lines containing the FILTER_PATTERN
file(STRINGS ${header} contain_filter
REGEX "^.*${FILTER_PATTERN}.*[(]"
)
# Remove function-like macros
foreach(line ${contain_filter})
if (NOT ${line} MATCHES ".*#[ ]*define")
list(APPEND not_macro ${line})
endif()
endforeach()
set(functions)
# Get only the function names followed by '('
foreach(line ${not_macro})
string(REGEX MATCHALL "[a-zA-Z0-9_]+[ ]*[(]" func ${line})
list(APPEND functions ${func})
endforeach()
set(extracted_symbols)
# Remove '('
foreach(line ${functions})
string(REGEX REPLACE "[(]" "" symbol ${line})
string(STRIP "${symbol}" symbol)
list(APPEND extracted_symbols ${symbol})
endforeach()
list(APPEND symbols ${extracted_symbols})
endforeach()
list(REMOVE_DUPLICATES symbols)
file(WRITE ${OUTPUT_PATH} "${symbols}")
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